CA2131885A1 - Anterior dorsal ankle foot orthoses - Google Patents
Anterior dorsal ankle foot orthosesInfo
- Publication number
- CA2131885A1 CA2131885A1 CA002131885A CA2131885A CA2131885A1 CA 2131885 A1 CA2131885 A1 CA 2131885A1 CA 002131885 A CA002131885 A CA 002131885A CA 2131885 A CA2131885 A CA 2131885A CA 2131885 A1 CA2131885 A1 CA 2131885A1
- Authority
- CA
- Canada
- Prior art keywords
- foot
- orthoses
- thc
- yoke
- anterior
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F5/00—Orthopaedic methods or devices for non-surgical treatment of bones or joints; Nursing devices; Anti-rape devices
- A61F5/01—Orthopaedic devices, e.g. splints, casts or braces
- A61F5/0102—Orthopaedic devices, e.g. splints, casts or braces specially adapted for correcting deformities of the limbs or for supporting them; Ortheses, e.g. with articulations
- A61F5/0104—Orthopaedic devices, e.g. splints, casts or braces specially adapted for correcting deformities of the limbs or for supporting them; Ortheses, e.g. with articulations without articulation
- A61F5/0111—Orthopaedic devices, e.g. splints, casts or braces specially adapted for correcting deformities of the limbs or for supporting them; Ortheses, e.g. with articulations without articulation for the feet or ankles
Landscapes
- Health & Medical Sciences (AREA)
- Nursing (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
Abstract
An orthopedic brace for foot drop and similar conditions utilizes an anterior dorsal ankle foot orthoses having anterior support (10) adapted to be placed against the shin of the leg and strapped to the leg at a point below the knee. The lower end (28) of the orthoses terminates in a yoke (30) at the dorsal portion of the foot, the yoke (30) having lateral side members (34 and 36) adapted to be placed on either side of the foot for supporting a foot pad (40). The foot pad (40) supports the foot from the heel to the ball. The ankle/foot orthoses may be placed in standard footwear, reducing the visibility of the brace to the observer.
Description
WO g3/17641 21318 8 S ~ PCr/USs3/02211 ANTERIOR DORSAL ANKLE FOOT_ORTHOSES
BACKGROUND OF THE INVENTION
Field of the Invention The invention is gencr~lly relatcd to orthopedic braces and is specifi-cally related to an ankle foot orthoses for drop foot and related ankle and footconditions.
DescriPtion of the Prior Art Drop foot and rclatcd conditions resulting from a paralysis or weaknes~
of dorsi flexion muscles is oftcn a condition expcrienced by stroke victims and can be brought on by other trauma, injuries and pathologics to thc Icg, foot and ankle, as wcll. Over the ycars, orthopcdic braces havc bccn developed to correct the condition, permitting a padent to waL~c and funcdon in a rclativcly normal manner. Convention-al braccs uscd to corrcct drop foot conditions control and support the foot, butgcnerally restrict modon about thc ankle. Thc carly braces wcrc made of me~al and includcd two solid bars which were placed on either side of the foot and extended upwardly along thc inside and outside of the leg to a point below ~he knce. The uppcr end of thc metal brace was then securcd about the lcg by use of a strap. Thc lower end of thc metal brace was secured to a modified shoc and held thc shoe in a generally horizontal position for supporting the foot.
Thc earliest braces of this type supported thc shoc in a rigid position.
This pe~mitted thc padent to walk and funcdon in a generally normal manner with the - foot rigidly held in place. Further developments incorporated a brace using the metal side members which fit inside the shoc and had a platfotm or basc for supporting the foo~. Thc base was often spnng bhsed, pcrmittdng minimal flcxing of the foot whcn walking, creating a morc natural mo~ctncnt of thc foot rclativc to ~he ankle and leg.
; 25 While these braces were functionally acceptable, the use of the metal . sidc bars often created discomfort~ were cosmedcally unattractive, heavy and rcquired the use of either modified or customized shoes in order to permit the brace to be attachcd to and propcrly support the foot.
- W093/17641 213188S; ~ ; PCl/USs3/0221t With the advent of plastics, moldcd orthopedic braces bec:lme ~v~
able. A molded orthopedic brace for foot drop was dcvcloped and was generally L-shaped in configuradon, having a posterior support adapted to be placcd against the back of the leg. The posterior support cxtended f~om a point below the knee tO the S heel of thc patient, and included a contoured lo~,v~èr element which conforrned to ~he bottom or plantar surface of the foot. The foot support base extended outwardly to the sides of the foot and forward from the heel toward the toes. The posterior brace was made of a unitary rnolded construcdon and gcnerally held the foot in a ri~idposition. Because of the devadon of the foot by placing the brace behind the heel, and under the foot the padent was required to wear an cnlarged or modified shoe in order to place the brace inside the shoe.
The plasdc brace was also available in an ar~culating construction, whercin the foot bæe pordon was a separate member hingcdly connected to the posterior lcg support. As with thc carlicr mctal braccs, the hinge was spring biased, to create a dynamic hingc permitting limitcd movcmcnt of the foot and ankle relative to the lcg to simulate anldc movcment during walking and other acdvidcs. An example of a hinged, aniculated plastic o~thotic bracc is manufacwrcd by GaffneyTcchnology of Hillsborough, Oregon.
The typc of bracc applied oftcn dcpcnds on the scventy of the - . .
condition and the padent's ability to funcdon wi* an articulated brace or, whererequired, a rigid brace. Over thc ye~s, both the metal and plastic ardculated and non-articulated b~ces havc becn incpa~ as standard braces to bc applied to conect-for foo~t drop condi~o~ with the specific brace bcing sclccted bascd on ~ .
condidon and on the patient's abilides.
- While thc postcrior plasdc braces provided some advantagcs over ea~lier mctal braces and were cosmetically morc desirablc, the support of the foot - from bchind thc heel is unnatural since the ankle muscular structure and undons gcnerally support thc foot at the dors~l area. This was pamcularly true when theplastic postenor brace was allowcd to articulate. The plasdc posterior brace hinges the foot reladve to thc leg behind the heel rather than in front of the heel. Funher~
:
; : :
WO g3/17641 2 1 3 1 8 8 5 Pcr/uss3/o22ll bo~h the metal and plastic br~ces required the use of modified or in the leas~
enlarged shocs, generally m~king the condition and the brace obvious to even themost e~sual obsen~er. - ^
SUMMARY OF THE INVENTION
The subjeet invention is dirceted to an anterior dorsal ankle fool -orthopcdic braee for eorrccting a foot d~op eondition. Speeifically, the brace of the subjcct invention includes an anterior support which is adapted to be placed in ll posidon extcnding generally from the dorsal portion of the foot along the shin to a point bclow the knee. Thc basc for supporting thc foot is secured to the anterior support ncar the instcp of the foot by using a yokc or sdrrup which surrounds the dorsal portion of thc foot and is attaehcd to thc antcrior support. This permi~s thc hccl portion of thc foot to bc unobstrueted, and allow the patient to wear standard shoes, clirninating thc cxpensc of modificd foot wcar and reducing the obviousness of thc eondiion to thc typical obscrvcr.
ln add`iion, by atuching the foot brace to thc leg support at the dorsal area of the foot, thc foot movemcnt and foot support more elosely conform to themuseular and tcndon structure of the anlde joint, resulting in a greater degree of eo~mfort and efficiency to the patient.
Also, it has bccn found, by ineorporating different plastic thicknesses and structures, limited flexing of the foot is aehievable using an integral, one-piece strueture, eliminadng the need for bULlcy and cxpensive hinge struetures.
- I n addidon, by utilizing the s`drrup or yoke surrounding the dorsal pc~on of the foot and supporting the foot on either side of the ankle, twisting and other side modons of the foot are better eontro~ed withou~ adding to the structurc and 2~ without inercasing the diseomfort to the patient.
~; ` Thc antcrior dorsal anlde foot orthoses of the subjeet invention permits ~ s the foot to be- housed in a sti~up st~ueture which is plaeed in front of the ankle and at the dorsal po~ion of the foot resuldng in a mueh more natural fit and feel to the brace. By utilizing the more natural sdrrup-type support, the thickness and weight Or the support is generally reduced, resulting in less bulk, readily permitting most WO 93/17641 ` pcr/us93/o221l 2l3188S
patients to wear standard footwe~r and greatly r~ducing the visibility of the br~ce.
By suppordn~ the foot in the dorsal arca, the padent rcsumes a more norrn~ ait when walking and pcrforming othcr activides.
In its prefcrred fonn, the orthoses of the subject invention includes an S anterior support having a lower end tcrminating ju~t~'abovc the dorsal portion of the foot and an upper cnd tcrminating at a point below"the knee. The anterior suppon is adapted to be pl~iced in posidon on the lcg along the shin and is strapped in place on thc leg. A yokc or stirrup cxtcnds downwar~ly from the lower cnd of thc antcriorsuppon on cithcr side of the foot in front of the anklc for supporting a base adaptcd to receive the foot.
In the preferred embodinicnt, thc base cxtends from hecl to approxi-r~nately thc ball of the foot, leaving the toes free to flex and extend in a norrnal manncr during walking and other actdvities. Thc brace may be customizcd to fit each particular patient. Howevcr, it has been found that standard form braces are widely adaptable to a variety of patient needs and condsdons, reducing the cost of the brace to the individual whcrc desired.
In the prefcrred cmbodsment of the invendon, thc strap includcs a hook-and-loop type fastener pad pen~itdng quick installation and removal of the bracc with a minimum of instruction. The brace may be madie of an integral, unitary ; 20 construcdon using cither thc~noplasdc mate~ial. Undcrnormal circumstanccs it has becn found that 3/16" gcnerally pesmits the padcnt to wcar standard footwcar andgrcady ~ducing the visibility of the br~cc when warn undcr clothing ~snd shoes. Of course, thickncss is a factor of need, patien~ sizc and application.
Whcre desired, thc shapc and thickness of the yoke or StilTUp can bc controlled to control the amount of flexion bctween the foot base and thc !cg support.
depending on thc sevcrity of thc condidon of the padent.
It is, thereforc, an object and feature of the subjcct invcntion ~o provide an orthope~ic bracc for correcdng a foot drop condition.
WO93/17641 21 31 88 ~ PCI/US93/02211 lt is another object and feature of the subject invention to provide ~n orthopcdic bracc which provides an anterior and dorsal support of the foot.
Another object ~nd feature of the subject invention is tQ provide medi;ll lateral, or side-to-side control against the ankle from rolling over.
S It is an additional object and fca~ure of the subject invention to provide for an orthopedic foot brace for correcting drop foot condition, while pennitting the patient to wear nonnal footwcar.
It is yet another object and feature of thc subject invention to provide an anterior dorsal ankle foot orthoses supporting the foot in advance of the ankle and in the dorsal area for more closely conforming to the n~tural ankle foot skeletal and muscular structure.
It is an additional object and fean~e of the subject invcntion to provide for an anterior dorsal ankle foot orthoses of a unitary construction pcrmitting flexure of the foot relative to the anlde without the use of hinged members and the like.
Other objects and featurcs of the invenion will bc readily apparcnt from the accompanying drawings and dctailcd description of thc prcfe~ed cmbodi-ment.
BRIEF DESCRIPTION OF T~ DRAW~NGS
Fig. 1 is a pcrspective view of thc antcrior dorsal ankle foot orthoses of ~e subjec~ invendon.
Fig. 2 is a cross sectional view looking generally in the same direction as Fig. 1.
Fig. 3 is a fragrnent~ sectional view looking generally along ~he line 3-3 of Fig. 2.
Flg. 4 is a fragmentary sectional vicw looking generally along the line - 4 4 of Fig. 2.
DETALED DESCRIP~ON OF T~ PREFERRED EMBODIMENT
As shown in Fig l, the foot bracc or foot orthoses of the subject invention includes an anterior support 10 which is contoured to fit along the leg~ 1~ of the patient and to be positioned against the shin, as shown. The upper end 14 of the Wo 93/17641 Pcr/uss3/o22ll 2~,3~ S ''''~':
anterior support termin~tes ~t a point below thc knee of the patient and is ~enerally expandcd as at 16 and 17 (Fig. 2) to provide good peripheral support ;md rigidity lo thc anterior support member for holding it securely against the leg. In the prefelTed embodiment, an elongated strap 18 has one end 20 which is secured to lhe front surface of the anterior support near the upper cnd 14 and another end 2~ which is releasably secu~ed to thc support for wrappin~ thc strap 18 around the leg 12 for securing the support thercon.
In the prefcrred cmbodiment, the strap 18 includes a hook-and-loop type fastener patch 24 or a material compatiblc with a similar fastener on the in~erior surface of thc strap. The support 10 includes a compatible hook-and-loop type fastencr patch 26. Both cnds of the strap 20 and 22 may be readily secured to the patch 26 for securing thc brace to the kg 12. Typically, thc strap 18 is made of a flcxible~ non-stretchable material such æ nylon or thé like. Whcre desired, a limi~ed strctchablc matcrial may be utilized tO permit the strap to expand and contract with the leg during certain activitics.
The lower end 28 of thc antcrior support tcrminates in a yoke or stirrup 30 which has a top pad 32 adapted to bc placed ovcr thc dorsal portion of thc foot and two clongated side mcmbers 34 and 36 which are adaptcd to extend downwardly from thc dorsal pad 32 along dther sidc of ~e foot in advance of the ankle joint 38 (~;ig. 2). The lower end of each sidc member 34 and 36 suppons the oppositc sidcs of a foot pad or basc 40.
In the pse6ned embodiment, the foot base 40 terminates u a front edge 42 jus~ u the ball of the foot, pe~mitting thc tocs to flex in a rcladvcly nonnal manner whilc providing support for thc foo~ As shown in Fig. 3, the front end edge 25 - 42 may be contourcd to confonn to thc natural shape of the foot. The rear end edge 44 of thc foot basc is upturncd along a radius conforming substandally to the radius of the heel to providc a low rim 46. The rim 46 assures that the foot will not slip in the foot pad oncc thç foot and Icg are installed in the brace~ Where desired, the rim 46 can continue along the side cdges of the pad and into the side members 34and 36 of the yoke 30 to provide a latcral support for the foon f~WO 93/1764~ 2131 8 8 5 PCI/US93/02211 In the preferred form, the sidc members 34 and 36 are inclined forwar(l from thc dorsal cnd 28 of the antcrior support toward the ball of the foot, shown by the includcd angle A (Fig. l). This providcs a natural feel for suppo~tin~ the foot installcd in thc brace. As is particularly shown in Fig. 4, the yoke pad 3~ and side~
34, 36 may bc contoured to confonn substantially to the natur.ll contour of the dors;ll and sidc portions of the foot, providing a comfortable fit.
It is an irnportant fcature of the invcntion that the orthoses of the subject invention may be readily reccived in standard footwear as indicated by the shoe 48 (Fig. 2). In a typical applicadon, thc patient would first put on socks,stockings or other no~nal clothing and then place thc foot in thc brace bctween the yokc and thc footpad, with thc hccl against the heel ridge or rim 46 and a dorsal portion of thc foot cngaging thc dorsal pad 32 of the yoke. Thc shoe 48 may then be pla~cd on thc foot in the normal manner. The strap 18 is placed around the le~ with thc opposite ends 20 and 22 secured to the fastener pad 26 for sccuring the orthoses lS to the lcg. lt has been found that a thin walbd matcrial such as thermoplastic havin~
a thickncss of 3/16" undcr normal circumstanccs is suitable for the brace and can be accon~d by most standard footwear. Of course, thickness is a factor of necd.
padcn~ sizc and applicadon.
Thc yoke of the prcfcrred cmbodiment may bc rigid or may be sufficiently flcxiblc to pcnnit the foot and lcg to flex in a li~ruted manncr approxi-matcly u the lower dorsal cnd 28 of the anterior support 10. Dcpcnding on the condition of thc patient, rigidity of the yoke can bc controllcd by thc arnount and thiclcncss of lhe material of thc bracc in thc area of thc yoke pad 32 and thc dorsal end 28 of the antcrior suppo~ Also, dcpcnding upon thc condition of the pa~ient,and the necd for me~lial and latcral support, the rim 46 may bc cxtendcd in height ~ and tbe length of the foot pad (as controlled by the front end cdgc 42) may be altcred ;` to spccific necd.
r~ .
Thc prefcrrcd cmbodimcnt of thc orthoscs of the subject invention is of a unitaly molded construction made of a thcrmoplastic material, and where desircd, may be heated for minor adjustment in form and shape. Custom orthoses may be WO 93/17641 PCr/USs3/02~
made by utilizing a cast mold of the patient's foot and leg and constructing a custom moldcd brace thcrefrom. Howevcr, it has been found that a plurality of standardized braces are ve~y effudvc for a large number of applications, greatly reducing the cost of thc orthoses to the paticnt.
S Thc anterior dorsal ankle fo~t orthoses of the subjcct invention providcs an improved orthopedic bracc for foot drop and similar conditions which has provcn to bc morc comfortablc than the posterior support braces of the prior art, providing the padcnt with a more no~nal fcel. It is an addcd advantage of the pardcular configuration of the bracc that it rcadily accepts normal footwear, grcatly 10 - rcducing the visibility of thc brace and tnc paticnt's condition to the average obscrver.
" ::
J
: `
'
BACKGROUND OF THE INVENTION
Field of the Invention The invention is gencr~lly relatcd to orthopedic braces and is specifi-cally related to an ankle foot orthoses for drop foot and related ankle and footconditions.
DescriPtion of the Prior Art Drop foot and rclatcd conditions resulting from a paralysis or weaknes~
of dorsi flexion muscles is oftcn a condition expcrienced by stroke victims and can be brought on by other trauma, injuries and pathologics to thc Icg, foot and ankle, as wcll. Over the ycars, orthopcdic braces havc bccn developed to correct the condition, permitting a padent to waL~c and funcdon in a rclativcly normal manner. Convention-al braccs uscd to corrcct drop foot conditions control and support the foot, butgcnerally restrict modon about thc ankle. Thc carly braces wcrc made of me~al and includcd two solid bars which were placed on either side of the foot and extended upwardly along thc inside and outside of the leg to a point below ~he knce. The uppcr end of thc metal brace was then securcd about the lcg by use of a strap. Thc lower end of thc metal brace was secured to a modified shoc and held thc shoe in a generally horizontal position for supporting the foot.
Thc earliest braces of this type supported thc shoc in a rigid position.
This pe~mitted thc padent to walk and funcdon in a generally normal manner with the - foot rigidly held in place. Further developments incorporated a brace using the metal side members which fit inside the shoc and had a platfotm or basc for supporting the foo~. Thc base was often spnng bhsed, pcrmittdng minimal flcxing of the foot whcn walking, creating a morc natural mo~ctncnt of thc foot rclativc to ~he ankle and leg.
; 25 While these braces were functionally acceptable, the use of the metal . sidc bars often created discomfort~ were cosmedcally unattractive, heavy and rcquired the use of either modified or customized shoes in order to permit the brace to be attachcd to and propcrly support the foot.
- W093/17641 213188S; ~ ; PCl/USs3/0221t With the advent of plastics, moldcd orthopedic braces bec:lme ~v~
able. A molded orthopedic brace for foot drop was dcvcloped and was generally L-shaped in configuradon, having a posterior support adapted to be placcd against the back of the leg. The posterior support cxtended f~om a point below the knee tO the S heel of thc patient, and included a contoured lo~,v~èr element which conforrned to ~he bottom or plantar surface of the foot. The foot support base extended outwardly to the sides of the foot and forward from the heel toward the toes. The posterior brace was made of a unitary rnolded construcdon and gcnerally held the foot in a ri~idposition. Because of the devadon of the foot by placing the brace behind the heel, and under the foot the padent was required to wear an cnlarged or modified shoe in order to place the brace inside the shoe.
The plasdc brace was also available in an ar~culating construction, whercin the foot bæe pordon was a separate member hingcdly connected to the posterior lcg support. As with thc carlicr mctal braccs, the hinge was spring biased, to create a dynamic hingc permitting limitcd movcmcnt of the foot and ankle relative to the lcg to simulate anldc movcment during walking and other acdvidcs. An example of a hinged, aniculated plastic o~thotic bracc is manufacwrcd by GaffneyTcchnology of Hillsborough, Oregon.
The typc of bracc applied oftcn dcpcnds on the scventy of the - . .
condition and the padent's ability to funcdon wi* an articulated brace or, whererequired, a rigid brace. Over thc ye~s, both the metal and plastic ardculated and non-articulated b~ces havc becn incpa~ as standard braces to bc applied to conect-for foo~t drop condi~o~ with the specific brace bcing sclccted bascd on ~ .
condidon and on the patient's abilides.
- While thc postcrior plasdc braces provided some advantagcs over ea~lier mctal braces and were cosmetically morc desirablc, the support of the foot - from bchind thc heel is unnatural since the ankle muscular structure and undons gcnerally support thc foot at the dors~l area. This was pamcularly true when theplastic postenor brace was allowcd to articulate. The plasdc posterior brace hinges the foot reladve to thc leg behind the heel rather than in front of the heel. Funher~
:
; : :
WO g3/17641 2 1 3 1 8 8 5 Pcr/uss3/o22ll bo~h the metal and plastic br~ces required the use of modified or in the leas~
enlarged shocs, generally m~king the condition and the brace obvious to even themost e~sual obsen~er. - ^
SUMMARY OF THE INVENTION
The subjeet invention is dirceted to an anterior dorsal ankle fool -orthopcdic braee for eorrccting a foot d~op eondition. Speeifically, the brace of the subjcct invention includes an anterior support which is adapted to be placed in ll posidon extcnding generally from the dorsal portion of the foot along the shin to a point bclow the knee. Thc basc for supporting thc foot is secured to the anterior support ncar the instcp of the foot by using a yokc or sdrrup which surrounds the dorsal portion of thc foot and is attaehcd to thc antcrior support. This permi~s thc hccl portion of thc foot to bc unobstrueted, and allow the patient to wear standard shoes, clirninating thc cxpensc of modificd foot wcar and reducing the obviousness of thc eondiion to thc typical obscrvcr.
ln add`iion, by atuching the foot brace to thc leg support at the dorsal area of the foot, thc foot movemcnt and foot support more elosely conform to themuseular and tcndon structure of the anlde joint, resulting in a greater degree of eo~mfort and efficiency to the patient.
Also, it has bccn found, by ineorporating different plastic thicknesses and structures, limited flexing of the foot is aehievable using an integral, one-piece strueture, eliminadng the need for bULlcy and cxpensive hinge struetures.
- I n addidon, by utilizing the s`drrup or yoke surrounding the dorsal pc~on of the foot and supporting the foot on either side of the ankle, twisting and other side modons of the foot are better eontro~ed withou~ adding to the structurc and 2~ without inercasing the diseomfort to the patient.
~; ` Thc antcrior dorsal anlde foot orthoses of the subjeet invention permits ~ s the foot to be- housed in a sti~up st~ueture which is plaeed in front of the ankle and at the dorsal po~ion of the foot resuldng in a mueh more natural fit and feel to the brace. By utilizing the more natural sdrrup-type support, the thickness and weight Or the support is generally reduced, resulting in less bulk, readily permitting most WO 93/17641 ` pcr/us93/o221l 2l3188S
patients to wear standard footwe~r and greatly r~ducing the visibility of the br~ce.
By suppordn~ the foot in the dorsal arca, the padent rcsumes a more norrn~ ait when walking and pcrforming othcr activides.
In its prefcrred fonn, the orthoses of the subject invention includes an S anterior support having a lower end tcrminating ju~t~'abovc the dorsal portion of the foot and an upper cnd tcrminating at a point below"the knee. The anterior suppon is adapted to be pl~iced in posidon on the lcg along the shin and is strapped in place on thc leg. A yokc or stirrup cxtcnds downwar~ly from the lower cnd of thc antcriorsuppon on cithcr side of the foot in front of the anklc for supporting a base adaptcd to receive the foot.
In the preferred embodinicnt, thc base cxtends from hecl to approxi-r~nately thc ball of the foot, leaving the toes free to flex and extend in a norrnal manncr during walking and other actdvities. Thc brace may be customizcd to fit each particular patient. Howevcr, it has been found that standard form braces are widely adaptable to a variety of patient needs and condsdons, reducing the cost of the brace to the individual whcrc desired.
In the prefcrred cmbodsment of the invendon, thc strap includcs a hook-and-loop type fastener pad pen~itdng quick installation and removal of the bracc with a minimum of instruction. The brace may be madie of an integral, unitary ; 20 construcdon using cither thc~noplasdc mate~ial. Undcrnormal circumstanccs it has becn found that 3/16" gcnerally pesmits the padcnt to wcar standard footwcar andgrcady ~ducing the visibility of the br~cc when warn undcr clothing ~snd shoes. Of course, thickncss is a factor of need, patien~ sizc and application.
Whcre desired, thc shapc and thickness of the yoke or StilTUp can bc controlled to control the amount of flexion bctween the foot base and thc !cg support.
depending on thc sevcrity of thc condidon of the padent.
It is, thereforc, an object and feature of the subjcct invcntion ~o provide an orthope~ic bracc for correcdng a foot drop condition.
WO93/17641 21 31 88 ~ PCI/US93/02211 lt is another object and feature of the subject invention to provide ~n orthopcdic bracc which provides an anterior and dorsal support of the foot.
Another object ~nd feature of the subject invention is tQ provide medi;ll lateral, or side-to-side control against the ankle from rolling over.
S It is an additional object and fca~ure of the subject invention to provide for an orthopedic foot brace for correcting drop foot condition, while pennitting the patient to wear nonnal footwcar.
It is yet another object and feature of thc subject invention to provide an anterior dorsal ankle foot orthoses supporting the foot in advance of the ankle and in the dorsal area for more closely conforming to the n~tural ankle foot skeletal and muscular structure.
It is an additional object and fean~e of the subject invcntion to provide for an anterior dorsal ankle foot orthoses of a unitary construction pcrmitting flexure of the foot relative to the anlde without the use of hinged members and the like.
Other objects and featurcs of the invenion will bc readily apparcnt from the accompanying drawings and dctailcd description of thc prcfe~ed cmbodi-ment.
BRIEF DESCRIPTION OF T~ DRAW~NGS
Fig. 1 is a pcrspective view of thc antcrior dorsal ankle foot orthoses of ~e subjec~ invendon.
Fig. 2 is a cross sectional view looking generally in the same direction as Fig. 1.
Fig. 3 is a fragrnent~ sectional view looking generally along ~he line 3-3 of Fig. 2.
Flg. 4 is a fragmentary sectional vicw looking generally along the line - 4 4 of Fig. 2.
DETALED DESCRIP~ON OF T~ PREFERRED EMBODIMENT
As shown in Fig l, the foot bracc or foot orthoses of the subject invention includes an anterior support 10 which is contoured to fit along the leg~ 1~ of the patient and to be positioned against the shin, as shown. The upper end 14 of the Wo 93/17641 Pcr/uss3/o22ll 2~,3~ S ''''~':
anterior support termin~tes ~t a point below thc knee of the patient and is ~enerally expandcd as at 16 and 17 (Fig. 2) to provide good peripheral support ;md rigidity lo thc anterior support member for holding it securely against the leg. In the prefelTed embodiment, an elongated strap 18 has one end 20 which is secured to lhe front surface of the anterior support near the upper cnd 14 and another end 2~ which is releasably secu~ed to thc support for wrappin~ thc strap 18 around the leg 12 for securing the support thercon.
In the prefcrred cmbodiment, the strap 18 includes a hook-and-loop type fastener patch 24 or a material compatiblc with a similar fastener on the in~erior surface of thc strap. The support 10 includes a compatible hook-and-loop type fastencr patch 26. Both cnds of the strap 20 and 22 may be readily secured to the patch 26 for securing thc brace to the kg 12. Typically, thc strap 18 is made of a flcxible~ non-stretchable material such æ nylon or thé like. Whcre desired, a limi~ed strctchablc matcrial may be utilized tO permit the strap to expand and contract with the leg during certain activitics.
The lower end 28 of thc antcrior support tcrminates in a yoke or stirrup 30 which has a top pad 32 adapted to bc placed ovcr thc dorsal portion of thc foot and two clongated side mcmbers 34 and 36 which are adaptcd to extend downwardly from thc dorsal pad 32 along dther sidc of ~e foot in advance of the ankle joint 38 (~;ig. 2). The lower end of each sidc member 34 and 36 suppons the oppositc sidcs of a foot pad or basc 40.
In the pse6ned embodiment, the foot base 40 terminates u a front edge 42 jus~ u the ball of the foot, pe~mitting thc tocs to flex in a rcladvcly nonnal manner whilc providing support for thc foo~ As shown in Fig. 3, the front end edge 25 - 42 may be contourcd to confonn to thc natural shape of the foot. The rear end edge 44 of thc foot basc is upturncd along a radius conforming substandally to the radius of the heel to providc a low rim 46. The rim 46 assures that the foot will not slip in the foot pad oncc thç foot and Icg are installed in the brace~ Where desired, the rim 46 can continue along the side cdges of the pad and into the side members 34and 36 of the yoke 30 to provide a latcral support for the foon f~WO 93/1764~ 2131 8 8 5 PCI/US93/02211 In the preferred form, the sidc members 34 and 36 are inclined forwar(l from thc dorsal cnd 28 of the antcrior support toward the ball of the foot, shown by the includcd angle A (Fig. l). This providcs a natural feel for suppo~tin~ the foot installcd in thc brace. As is particularly shown in Fig. 4, the yoke pad 3~ and side~
34, 36 may bc contoured to confonn substantially to the natur.ll contour of the dors;ll and sidc portions of the foot, providing a comfortable fit.
It is an irnportant fcature of the invcntion that the orthoses of the subject invention may be readily reccived in standard footwear as indicated by the shoe 48 (Fig. 2). In a typical applicadon, thc patient would first put on socks,stockings or other no~nal clothing and then place thc foot in thc brace bctween the yokc and thc footpad, with thc hccl against the heel ridge or rim 46 and a dorsal portion of thc foot cngaging thc dorsal pad 32 of the yoke. Thc shoe 48 may then be pla~cd on thc foot in the normal manner. The strap 18 is placed around the le~ with thc opposite ends 20 and 22 secured to the fastener pad 26 for sccuring the orthoses lS to the lcg. lt has been found that a thin walbd matcrial such as thermoplastic havin~
a thickncss of 3/16" undcr normal circumstanccs is suitable for the brace and can be accon~d by most standard footwear. Of course, thickness is a factor of necd.
padcn~ sizc and applicadon.
Thc yoke of the prcfcrred cmbodiment may bc rigid or may be sufficiently flcxiblc to pcnnit the foot and lcg to flex in a li~ruted manncr approxi-matcly u the lower dorsal cnd 28 of the anterior support 10. Dcpcnding on the condition of thc patient, rigidity of the yoke can bc controllcd by thc arnount and thiclcncss of lhe material of thc bracc in thc area of thc yoke pad 32 and thc dorsal end 28 of the antcrior suppo~ Also, dcpcnding upon thc condition of the pa~ient,and the necd for me~lial and latcral support, the rim 46 may bc cxtendcd in height ~ and tbe length of the foot pad (as controlled by the front end cdgc 42) may be altcred ;` to spccific necd.
r~ .
Thc prefcrrcd cmbodimcnt of thc orthoscs of the subject invention is of a unitaly molded construction made of a thcrmoplastic material, and where desircd, may be heated for minor adjustment in form and shape. Custom orthoses may be WO 93/17641 PCr/USs3/02~
made by utilizing a cast mold of the patient's foot and leg and constructing a custom moldcd brace thcrefrom. Howevcr, it has been found that a plurality of standardized braces are ve~y effudvc for a large number of applications, greatly reducing the cost of thc orthoses to the paticnt.
S Thc anterior dorsal ankle fo~t orthoses of the subjcct invention providcs an improved orthopedic bracc for foot drop and similar conditions which has provcn to bc morc comfortablc than the posterior support braces of the prior art, providing the padcnt with a more no~nal fcel. It is an addcd advantage of the pardcular configuration of the bracc that it rcadily accepts normal footwear, grcatly 10 - rcducing the visibility of thc brace and tnc paticnt's condition to the average obscrver.
" ::
J
: `
'
Claims (17)
1. An anterior dorsal ankle foot orthoses, including an anterior support having a lower end and an upper end and being of sufficient length to be placed in a position extending generally from the dorsal portion of the foot along the shin to a point below the knee, a strap secured to the brace near the top of the anterior support and adapted for securing the anterior support to the leg, a yoke having a pair of continuous elongated sides, each including a top end secured to the lower end of the anterior support and a lower end, the yoke adapted to be placed around the dorsal and side portions of the foot, and including an integral footpad secured to the lower end of each side of the yoke for supporting the bottom of the foot when it is placed in the yoke, the footpad further including a rear end edge having an upstanding lip adapted to be positioned behind the heel of the foot.
2. The orthoses of claim 1, the footpad further including a front end positioned at the ball of the foot for permitting the toes to flex when the pad is in place.
3. The orthoses of claim 1, wherein said upstanding lip extends from the rear end edge and adapted for abutting against the back of the heel for preventing slippage of the pad relative to the foot.
4. The orthoses of claim 3, wherein said lip is defined by a radius conforming substantially to the curvature of the heel.
5. The orthoses of claim 4, wherein the foot pad includes side edges extending along the outer sides of the foot and wherein aid upstanding rim extends forward from said rear end edge along said side edges of the foot pad and terminates at the elongated sides of said yoke.
6. The orthoses of claim 1, wherein the sides of the yoke are on a line intersecting the foot pad at an acute angle such that the upper end of the yoke is secured to the anterior support at the front of and adjacent the front portion of the ankle and the lower end of the yoke is secured to the foot pad at a position near the ball of the foot.
7. The orthoses of claim 1, wherein the anterior support includes a front outer surface and a back inner surface, and wherein the back inner surface is adapted to be placed against the shin of the leg.
8. The orthoses of claim 7, including a strap secured to the front outer surface of the anterior support.
9. The orthoses of claim 8, wherein the strap comprises an elongated flexible strip having opposite outer ends, one of said ends being permanently secured to the anterior support and the other of said ends adapted to the placed around the leg and releasably secured to the anterior support.
10. The orthoses of claim 9, further including a fastener secured to the front surface of the anterior orthoses and adapted for receiving and releasably securing said other end of the strap.
11. The orthoses of claim 10, wherein said fastener is a hook-and-loop type fastener pad and wherein said strap includes a compatible hook-and-loop pad adapted to mate with said fastener pad.
12. The orthoses of claim 11, wherein the strap is constructed of a flexible, non-stretchable material.
13. The orthoses of claim 1, wherein the unitary anterior support and base are constructed of thermoplastic material.
14. The orthoses of claim 1, wherein the unitary anterior support and orthoses are of a molded construction having a thickness of approximately 3/16".
15. The orthoses of claim 1, wherein the yoke is flexible, whereby the foot pad can move relative to the anterior support for simulating the natural flexing of the foot during a walking motion.
16. The orthoses of claim 1, wherein the anterior orthoses further includes a center section of a predetermined width limited generally to the width of the front of the shin and terminating in an upper end having side edges expanding outwardly from the predetermined width and contoured to wrap around a portion of the periphery of the leg.
17. The orthoses of claim 16, wherein the lower end of the anterior support is contoured to fit the dorsal portion of the foot.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US849,756 | 1992-03-12 | ||
| US07/849,756 US5219324A (en) | 1992-03-12 | 1992-03-12 | Anterior dorsal ankle foot orthoses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2131885A1 true CA2131885A1 (en) | 1993-09-16 |
Family
ID=25306448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002131885A Abandoned CA2131885A1 (en) | 1992-03-12 | 1993-03-11 | Anterior dorsal ankle foot orthoses |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5219324A (en) |
| CA (1) | CA2131885A1 (en) |
| DE (1) | DE9390060U1 (en) |
| WO (1) | WO1993017641A1 (en) |
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| US5810754A (en) * | 1997-02-14 | 1998-09-22 | Kenosh; Michael J. | Ankle orthotic |
| DE69831010T2 (en) * | 1997-10-15 | 2006-06-01 | Robert John Fordingbridge Watts | ANKLE FOOT ORTHESIS |
| US6019741A (en) * | 1998-01-09 | 2000-02-01 | Prieskorn; David W. | Orthopedic foot splint |
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| US3504668A (en) * | 1967-09-13 | 1970-04-07 | Robert E Boudon | Foot support |
| US4510927A (en) * | 1983-04-14 | 1985-04-16 | Peters Rick E | Ankle brace |
| US4665904A (en) * | 1985-06-19 | 1987-05-19 | Max Lerman | Circular hinge for orthotic braces |
| DE3640915A1 (en) * | 1986-11-29 | 1988-06-01 | Wilhelm Josef Hefele | Ankle joint support |
| US4982733A (en) * | 1989-05-17 | 1991-01-08 | Finlayson & Singlehurst | S T S (sub-talar stabilizer) ankle brace |
-
1992
- 1992-03-12 US US07/849,756 patent/US5219324A/en not_active Expired - Fee Related
-
1993
- 1993-03-11 DE DE9390060U patent/DE9390060U1/en not_active Expired - Lifetime
- 1993-03-11 WO PCT/US1993/002211 patent/WO1993017641A1/en active Application Filing
- 1993-03-11 CA CA002131885A patent/CA2131885A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US5219324A (en) | 1993-06-15 |
| DE9390060U1 (en) | 1994-12-15 |
| WO1993017641A1 (en) | 1993-09-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |