WO2016124318A1

WO2016124318A1 - Surgical forceps comprising a jaw part configured in two parts

Info

Publication number: WO2016124318A1
Application number: PCT/EP2016/000141
Authority: WO
Inventors: Matthias Lentz; Dennis BERNHARDT
Original assignee: Olympus Winter & Ibe Gmbh
Priority date: 2015-02-02
Filing date: 2016-01-28
Publication date: 2016-08-11
Also published as: DE102015001163A1

Abstract

The invention relates to surgical forceps (10) comprising an elongated shaft (12), a handle (14) arranged proximally on the shaft, and a forceps head (16) arranged distally on the shaft and comprising a pivotable jaw part (18) and a fixed jaw part (20), wherein the handle (14) is coupled with an actuating rod (22) arranged longitudinally displaceable in the shaft (12), and wherein the pivotable jaw part (18) is fastened rotatably to the fixed jaw part (20), and wherein the pivotable jaw part (18) is coupled to the actuating rod (22) in a displaceable manner such that by longitudinally displacing the actuating rod (22), the pivotable jaw part (18) can be pivoted with respect to the fixed jaw part (20), wherein the fixed jaw part (20) consists of two separate jaw part elements (24, 26), wherein a manipulation surface (36) is configured on the first jaw part element (24) of the fixed jaw part (20) and the second jaw part element (26) encloses the actuating rod (22) at least in some regions.

Description

Surgical forceps with two-part jaw Description

The invention relates to a surgical forceps according to the preamble of claim 1, a pliers head for a surgical forceps according to the preamble of claim 7 and a method for assembling a forceps head of a surgical forceps according to claim 8.

Surgical forceps of this type typically operate a jaw mechanism located distally on a thin shaft via the operation of a handle disposed proximally on the forceps. Usually, a moving in the forceps shank actuating rod is displaced by the displacement of a handle member on the handle, which is motion-coupled with the jaw mechanism of the pliers head.

In the jaw mechanism of the pliers head is distinguished between pliers with two mutually pivotable jaws and pliers with a fixed and a pivoting jaw part. Pliers with fixed jaw parts are preferably used as needle holders or for other applications in which high clamping or holding forces are to be applied. To compensate for the high clamping forces that are applied by the forceps jaw, a stable and robust fixation of the stationary jaw part on the forceps body is required. The present invention relates to the improvement of a forceps with a stationary jaw part.

In known pliers of this type, the stationary jaw part is formed very long relative to the pivotable jaw part. To secure against pivoting, the fixed jaw part, for example with a guide sleeve in the distal end of Pliers shaft stuck and fixed. The guide sleeve serves on the one hand for supporting the jaw part on the forceps shank and on the other hand for guiding the actuating rod to the pivotable jaw part. Due to the design, the pivotable jaw part is initially coupled to the distal end of the actuating rod during assembly of the pliers head. The two jaws are not yet connected. The proximal end of the actuating rod is then pushed from the distal direction into the guide sleeve of the stationary jaw member and the pivotable jaw member is finally mounted rotatably mounted on the stationary jaw member. In order to avoid damage to the components during assembly of the pliers head by strong bending or jamming of the actuating rod, the fixed jaw part must have a relatively long extended diameter area for receiving the actuating rod. Fixed jaws of this known type have, among other two major disadvantages. On the one hand, their diameter due to installation are relatively large, which makes them unsuitable for particularly thin pliers with correspondingly thin forceps shanks and on the other hand, the fixed jaw part is very long in relation to the pivoting jaw part, which in the application for high-frequency surgery with current-carrying forceps industries to greatly increased isolation effort or leads large uninsulated surfaces.

Object of the present invention is to provide an improved surgical forceps and a pliers head of the type mentioned, which are easy and safe to operate with low component complexity and also allow easy production and fast assembly. The object of the invention is also to provide a simplified method for mounting a pliers head according to the invention. The object is achieved by a surgical forceps with the features of claim 1, a forceps pliers head for a surgical forceps with the features of claim 7 and further by a method for assembling a forceps pliers head of a surgical forceps with the features of claim 8. Advantageous embodiments are shown in FIG specified in the dependent claims. According to the invention, a surgical forceps having an elongated shaft, a handle arranged proximally on the shaft, and a pliers head disposed distally on the shaft with a fixed jaw part and a pivotable jaw part, wherein the handle is coupled to an actuating rod longitudinally displaceably mounted in the shaft, and wherein the pivotable jaw member is rotatably mounted on the fixed jaw member, and wherein the pivotable jaw member is coupled in motion to the actuating rod such that the longitudinal jaw of the actuating rod pivots the pivotable jaw member relative to the stationary jaw member, the stationary jaw member consisting of two separate jaw member members. and wherein a manipulation surface is formed on the first jaw part element of the stationary jaw part, and the second jaw part element engages around the actuating rod at least in regions.

This construction of the forceps and in particular the fixed jaw part not only facilitates the assembly of the forceps head, but also leads to an increased degree of miniaturization of the surgical instrument. In particular, in laparoscopic surgery so particularly gentle operations can be performed. The risk of tissue trauma or disorder during surgical procedures can be reduced by reducing the pliers diameter. Particularly advantageous is the design of the stationary jaw part with two separate jaw member elements in pliers with an average shank diameter of 5mm or less than 5mm.

The pliers head can be designed as scissors or gripping or clamping forceps or as pliers for electrocoagulation. A combination of gripping or clamping, cutting surfaces and electrodes for electrocoagulation is conceivable. The manipulation surfaces, which are formed on both jaw parts, can have smooth or structured surfaces, depending on the application. It is conceivable, for example, a wavy structure.

The use of a two-part stationary jaw part, in particular on surgical forceps for high-frequency surgery, is advantageous. Monopolar or bipolar instruments direct a high-frequency current fed in proximally to the instrument to one or both mouth parts of the forceps head, around a tissue part or a vessel located between the jaw parts, under the action of the current soil or to close or separate. In particular, in bipolar instruments complex insulation at the pliers head are necessary to prevent unwanted short circuits between the pliers industries or an unintentional discharge of the current to surrounding tissue. Unwanted short circuits lead to damage of the pliers head or the jaw mechanism and discharges to surrounding tissue leads to unwanted internal. Tissue burns in the work area of the pliers head. Insulations to prevent unwanted current drain are particularly provided in the field of jaw mechanics, or at the transition between forceps shank and pliers head.

According to a preferred embodiment, it is provided that the first jaw part element and the second jaw part element of the stationary jaw part cooperate in such a way that unintentional pivoting of the first jaw part element is prevented during the longitudinal displacement of the actuating rod. In particular, it is intended to prevent the deflection relative to the longitudinal orientation of the proximal shaft end. It should be noted that minimal deflections due to material elasticity or necessary gap dimensions are unavoidable and are not considered to be pivoting. In order to prevent a pivoting of the stationary jaw part, the first jaw part element can be fixed to the second jaw part element.

In order to enable a powerful opening of the forceps jaw, it is envisaged that the actuating rod is coupled tensile and compressive load with the pivotable jaw part. For this purpose, it is provided that the actuating rod is designed to transmit both tensile and compressive forces. Alternatively, the actuating rod can only be coupled to the pivotable jaw part with tensile load. This alternative is typically used in the use of wire-like actuating rods, which can transmit no or minimal compressive forces. For connection of the first jaw member element and the second jaw part element, it is advisable that a plug-in region is formed at the proximal end of the first jaw part element, which can be inserted into a receiving region of the second jaw part element which is open at the distal end of the second jaw part element. This supports a secure locking of the stationary jaw part or of the first jaw part element on the forceps shank. Alternatively, it is conceivable, a flange-like Provide connection between the first and second jaw member. It is also conceivable to form the plug-in area on the second, proximal jaw part element and the receiving area on the first, distal jaw part element. In a plug-in connection of first and second jaw member element may be provided to improve the rigidity of the fixed jaw part, that the receiving area is formed as a sleeve, wherein the receiving area surrounds the plug-in area in the inserted state in the circumferential direction fully. With a sleeve-like receptacle, a smooth transition between the forceps shank and the jaws of the pliers head can be made. This avoids irregularities on the tissue-contacting parts of the forceps and thus reduces the risk of tissue damage. In particular, when the first jaw member element has a extending to its proximal end longitudinal groove, the sleeve-like receptacle ensures a secure covering of the longitudinal groove and the operating rod guided therein. This can also be reduced irregularities on the outer wall of the instrument.

For fastening the pivotable jaw part to the stationary jaw part, it can be provided that a longitudinal groove is formed in the first jaw part element of the stationary jaw part, into which a fastening region of the pivotable jaw part can be inserted. Preferably, the longitudinal groove is formed in the proximal region of the first jaw member element. It is conceivable that the longitudinal groove is at least partially formed by a fork-like wall structure. Preferably, the groove is formed with straight, mutually parallel wall surfaces. The groove is preferably aligned in its longitudinal direction and in its depth direction parallel to the pivoting plane of the pivotable jaw part.

Advantageously, it can be provided that the groove groove of the groove is at least partially lower than the manipulation surface of the first jaw member element. In the case of an irregular, for example wave-shaped and / or an inclined manipulation surface, the highest point or the lowest point of the manipulation surface is considered as a reference. It is also conceivable that the groove completely penetrates the first jaw part element in its proximal end region, so that the first jaw part element has a fork-shaped opening at its proximal end. A deep groove, the assembly of the pliers head or the coupling of Actuating rod to facilitate the pivoting jaw part and provides clearance for the jaw mechanism for pivoting the pivotable jaw part relative to the stationary jaw part. According to the invention is further a pliers head of a surgical forceps with a fixed jaw part and a pivotable jaw part and a motion-coupled to the pivotable jaw actuator rod, in particular with one or more of the above, the pliers head features, wherein the stationary jaw part is formed of two separate jaw members, and wherein a manipulation surface is formed on the first jaw part element of the stationary jaw part and the second jaw part element engages around the actuating rod at least in regions.

The invention further provides a method for mounting a pliers head according to the invention, comprising the steps of: attaching the pivotable jaw part to the first jaw part element of the stationary jaw part; Inserting the actuating rod into the second jaw member element; Coupling of the actuating rod with the pivotable jaw part. This method is particularly advantageous since the actuating rod does not have to be guided - as usual - from a distal direction into a passage of the stationary jaw part, but can be inserted particularly easily from the proximal direction into the stationary jaw part. The pivotable jaw part may already be mounted rotatably mounted on the stationary jaw part, before it is coupled to the actuating rod. This leads to the acceleration of the assembly of the surgical forceps and their components and to avoid damage to the components

In a preferred embodiment, the additional method step may be provided: inserting a plug-in region formed on the first jaw member element into a receiving region formed on the second jaw member element. Particularly in the case of jaw part elements which are not mated together, the step may alternatively or additionally be provided: coupling of the first jaw part element to the second jaw part element.

Advantageous is an embodiment of the steps in the particular order. Advantages and conceivable design variants of the pliers head according to the invention and the method according to the invention for mounting the pliers head are also apparent Explanations for the surgical forceps according to the invention and associated embodiments.

Embodiments of the invention are shown schematically in the figures, show:

Fig. 1 is a greatly simplified schematic illustration of a surgical forceps according to the invention, Fig. 2, the pliers head of Fig. 1 with a two-part executed fixed

Jaw part in partially disassembled position,

Fig. 3 shows the two-part fixed jaw part of Fig. 2, Fig. 4 is a simplified sectional view of the stationary jaw part of FIG. 2 according to section line 4-4, and

Fig. 5 is a simplified sectional view of the fixed jaw part of Fig. 3 according to section line 5-5.

1 is a schematic illustration of a surgical forceps 10 in accordance with the present invention. As seen from right to left in the drawing, the forceps 10 proximal has a handle 14 coupled to an actuating rod 22. The actuating rod 22 runs in a shaft 12. Distal to the shaft 12, the pliers head 16 is arranged. The pliers head 16 has a pivotable jaw part 18 and a stationary jaw part 20. For the functional unit pliers head 16 and the actuating rod 22 can be counted. The pivotable jaw part 18 is connected in a motion-coupled manner to the distal end of the actuating rod 22 (not visible in FIG. 1). In particular, the pivotable jaw member 18 is tensile and compressive load coupled to the actuating rod 22. Alternatively, the pivotable jaw member 18 at least zugbelastbar coupled to the actuating rod 22, such that a force exerted on the handle 22 on the actuating rod 22 pulling force forces the pivotable jaw member 18 in the closed position. A force exerted on the actuating rod 22 pressing force forces the forceps jaw or the pivotable jaw member 18, however, in the open position. The fixed jaw part 20 consists of two separately executed jaw part elements 24 and 26, wherein the first jaw part element 24 is arranged distally to the second jaw part element 26. As indicated in FIG. 1, the pivotable jaw part 18 can be arranged distally, in particular at a distance, from the second jaw part element 26. In this exemplary embodiment, the pivotable jaw part 18 is mounted on the stationary jaw part 20 on a pivot axis 32. This can be provided in a simple variant, an axle. It is also conceivable that the pivotable jaw member 18 is rotatably mounted by means of two journals on the fixed jaw member 20. Preferably, the actuating rod 22 is designed as a rigid elongate rod or as a rigid tube. In this embodiment, it transmits both tensile and compressive forces on the pivotable jaw member 18. The actuating rod 22 may alternatively be formed as an elastic or inelastic wire, which can transmit at least tensile forces.

In this embodiment, a fixed and a pivotable handle member 38, 40 are arranged on the handle 14 which are pivotable against each other by one-handed operation of a user. Both gripping elements 38, 40 have in their end regions in each case a finger ring in the fingers or thumb can be brought to bear. The pivotable handle member 40 is coupled for movement with the actuating rod 22. When the grip elements 38, 40 are compressed, the actuating rod 22 is displaced in the proximal direction in the forceps shaft 12. Fig. 2 shows the pliers head 16 of FIG. 1 in a partially disassembled position. The two-part embodiment of the fixed jaw part 20 with the second jaw part element 24 arranged proximally is clearly visible. Proximal to the second jaw part element 26 is the shaft 12, which in this exemplary embodiment can be attached to a proximal insertion area of the second jaw part element 26 is.

The actuating rod 22 passes through the shaft 12 on the one hand, the second jaw member element 26 on the other hand, and finally leads into the first jaw part element 24. In the area of the first jaw part element 24, the distal end of the actuating rod 22 is coupled to the pivotable jaw part 18. FIG. 3 shows the two-part fixed jaw part 20 from FIG. 2. The actuating rod 22, which passes through the second jaw part element 26 in the position of use of the forceps 10, is shown by dashed lines. Clearly visible is a plug-in area 28 of the first jaw part element 28, which can be inserted into a distal receiving area 30 of the second jaw part element 26. On the first jaw member 24 of the stationary jaw member 20, a manipulation surface 36 is formed. In the present case, the manipulation surface 36 is shown as a smooth, non-structured surface. Without further ado, it is also possible to provide a structured, for example wave-shaped, manipulation surface 36. The manipulation surface 36 may be designed for a gripping, clamping and / or cutting function, wherein the manipulation surface 36 cooperates with a corresponding manipulation surface on the pivotable jaw part 18. The manipulation surfaces of the jaw parts 18 and 20 are active surfaces which determine the clamping, cutting or electrode function of the forceps jaw. The jaw part 18 and the first jaw part element 24 of the stationary jaw part 20 form the forceps branches or the forceps jaw of the forceps head 16.

4 and 5 are highly schematic sectional views of Figs. 2 and 3 along the section lines 4-4 and 5-5. As clearly visible in FIGS. 4 and 5, it is provided in this exemplary embodiment that the pivotable jaw part 18 is inserted into a longitudinal groove 34 for coupling to the stationary jaw part 20. The pivotable jaw member 18 is preferably rotatably mounted on the axis 32 on the stationary jaw part 20 for this purpose. In particular, from FIG. 5 it can be seen that the groove bottom of the groove 34 can be lower than the surface height of the manipulation surface 36 of the first jaw member 24. At 36, the surface of the manipulation surface 36 of the jaw member 20 is indicated.

In Fig. 5 is shown clearly recognizable that the plug-in portion 28, which is preferably formed integrally at the distal portion of the first jaw member 24, at its periphery in length, with the groove 34 is open aligned. In this case, the opening is aligned opposite to the insertion direction of the pivotable jaw part 18 (upward). As indicated in FIGS. 2, 3 and 5, provision may be made for the actuating rod 22, in its position of use, to protrude from the longitudinal opening of the plug-in region 28. It is contemplated that he male portion 28 of the first jaw member 24, the actuating rod 22 in the circumferential direction preferably over encompasses an angular range of more than 180 ° and advantageously in any case in such a way that actuator rod 22 in the mating region 28 safe, in particular prevented from slipping out side, out. The longitudinal opening of the plug-in area 28 allows a simple coupling of the actuating rod 22 with the pivotable jaw part 18, in particular, if the pivotable jaw part 18 is already mounted rotatably mounted on the stationary jaw part 20 before the coupling. As an alternative to the variant shown in FIG. 5, it may also be provided that the opening of the plug-in region 28 aligned with the groove 34 is located on the opposite side of the jaw member 18 (below) or that the plug-in region 28 is in alignment with the groove 34 in two directions (up and down) is open.

LIST OF REFERENCE NUMBERS

10 surgical forceps

12 shaft

14 handle

16 pliers head

18 pivoting jaw part

20 fixed jaw part

22 operating rod

24 first jaw member element

26 second jaw member

28 plug-in area

30 recording area

32 pivot axis

34 longitudinal groove

36 manipulation surface

38 handle element

40 handle element

*****

Claims

claims

A surgical forceps (10) comprising an elongate shaft (12), a handle (14) disposed proximally on the shaft, and a pliers head (16) disposed distally on the shaft and having a pivotable jaw portion (18) and a stationary jaw portion (20 ), wherein the handle (14) is coupled to an actuating rod (22) mounted longitudinally displaceably in the shaft (12), and wherein the pivotable jaw member (18) is mounted rotatably on the stationary jaw member (20), and wherein the pivotable jaw member (20) 18) is coupled for movement with the actuating rod (22) in such a way that the pivotable jaw member (18) is pivotable relative to the stationary jaw member (20) by the longitudinal displacement of the actuating rod (22), characterized in that the stationary jaw member (20) consists of two separate Jaw members (24, 26), wherein on the first jaw member member (24) of the stationary jaw member (20) has a manipulation surface (36) is formed and the second mouth ilelement (26) engages around the actuating rod (22) at least partially.

2. Surgical forceps according to claim 1, characterized in that the first jaw part element (24) and the second jaw part element (26) of the stationary jaw part (20) cooperate in such a way that during the longitudinal displacement of the actuating rod (22) unintentional pivoting of the first jaw part element (22). 24) is prevented.

3. Surgical forceps according to one of claims 1 or 2, characterized in that the actuating rod (22) tensile and compressive load with the pivotable jaw part (18) is coupled.

4. Surgical forceps according to one of the preceding claims, characterized in that at the proximal end of the first jaw part element (24), a plug-in region (28) is formed which in a at the distal end of the second jaw member member (26) open receiving area (30) of the second jaw member (26) can be inserted.

5. A surgical forceps according to claim 4, characterized in that the receiving area (30) is designed as a sleeve, wherein the receiving area (30) surrounds the plug-in area (28) in the inserted state in the circumferential direction fully.

6. Surgical forceps according to one of the preceding claims, characterized in that in the first jaw member element (24) of the stationary jaw member (20) has a longitudinal groove (34) is formed, into which a mounting portion of the pivotable jaw member (20) can be inserted.

7. pliers head (16) of a surgical forceps (10) with a fixed jaw part (18) and a pivotable jaw part (20) and a movement-coupled with the pivotable jaw part (20) actuating rod (22), in particular with the features of one of the preceding claims , characterized in that the stationary jaw part (20) of two separate jaw member elements (24, 26) is formed, wherein on the first jaw member (24) of the stationary jaw member (20) has a manipulation surface is formed and the second jaw member (26), the actuating rod (22) at least partially encompasses.

A method of assembling a forceps head (16) according to claim 7, comprising the steps of: securing the pivotable jaw member (18) to the first jaw member member (24) of the stationary jaw member (20); Inserting the actuating rod (22) into the second jaw member (26); Coupling the actuating rod (22) with the pivotable jaw member (18).

9. The method according to claim 8, further comprising the step of: inserting a plug-in area (28) formed on the first jaw part element (24) into a receiving area (30) formed on the second jaw part element (26).