CA2317578C - Method and device for loading a stent - Google Patents

Method and device for loading a stent Download PDF

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Publication number
CA2317578C
CA2317578C CA002317578A CA2317578A CA2317578C CA 2317578 C CA2317578 C CA 2317578C CA 002317578 A CA002317578 A CA 002317578A CA 2317578 A CA2317578 A CA 2317578A CA 2317578 C CA2317578 C CA 2317578C
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CA
Canada
Prior art keywords
stent
outer tube
sheath
axis
space
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.)
Expired - Fee Related
Application number
CA002317578A
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French (fr)
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CA2317578A1 (en
Inventor
Bradford G. Staehle
Anthony J. Ferrazzo
John H. Burton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Boston Scientific Scimed Inc
Original Assignee
American Medical Systems LLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by American Medical Systems LLC filed Critical American Medical Systems LLC
Publication of CA2317578A1 publication Critical patent/CA2317578A1/en
Application granted granted Critical
Publication of CA2317578C publication Critical patent/CA2317578C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/0095Packages or dispensers for prostheses or other implants
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/95Instruments specially adapted for placement or removal of stents or stent-grafts
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/95Instruments specially adapted for placement or removal of stents or stent-grafts
    • A61F2/9522Means for mounting a stent or stent-graft onto or into a placement instrument
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/95Instruments specially adapted for placement or removal of stents or stent-grafts
    • A61F2/9522Means for mounting a stent or stent-graft onto or into a placement instrument
    • A61F2/9525Means for mounting a stent or stent-graft onto or into a placement instrument using a funnel
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S623/00Prosthesis, i.e. artificial body members, parts thereof, or aids and accessories therefor
    • Y10S623/909Method or apparatus for assembling prosthetic

Abstract

A device (10) for loading a self expanding stent (11) into a deployment tool (12) has an outer tube (13) defining a space (14). A
method for using the device (10) might include the steps of slipping over the outer tube (13), seating the constricting sheath (15) along the axis and in position over the outer tube (13) and against the rest (18), collapsing the self expanding stent (11) before loading into the space (14) of the outer tube (13) in the funnel (19), carrying the stent (11) on the stent carrying shaft (21) cantilever therefrom, depressing the inserter (20) for movement along the axis and within the constricting sheath (15) towards the space (14) of the outer tube (13), and engaging the stent (11) with the shoulder (22) for urging the expanded stent (11) into the constricting sheath (15) as the inserter (20) moves towards and into the funnel (19).

Description

METHOD AND DEVICE FOR LOADING A STENT

This invention relates to a cartridge that stores a self-expanding stent in its expanded state until ready for placement, at which point it is compressed and transferred into a delivery tool.
Background of the Invention The device may be packaged separately from deployment tool and loaded with a stent in which the stent is then transferred into the deployment tool prior to placement. The deployment tool could be reusable. Also, the stent would not be subjected to compression set due to compression for prolonged period of time.
Self-expanding medical prostheses frequently referred to as stents are well known and commercially available. They are, for example, disclosed generally in the Walisten U.S. Patent 4,655,771, the Wallsten et al. U.S.
Patent 5,061,275 and in Hachtmann et al., U.S. Patent No. 5,645,559. Stents are used within body vessels of humans for a variety of medical applications. Examples include intravascular stents for treating stenoses, stents for maintaining openings in the urinary, biliary, tracheobronchial, esophageal, and renal tracts, and vena cava filters.
The implantation of an intraluminal stent will preferably cause a generally reduced amount of acute and chronic trauma to the luminal wall while performing its function. A stent that applies a gentle radial force against the wall and that is compliant and flexible with lumen movements is preferred for use in diseased, weakened, or brittle lumens. The stent will preferably be capable of withstanding radially occlusive pressure from tumors, plaque, and luminal recoil and remodeling.
A delivery tool which retains the stent in its radially compressed state is often used to present the stent to a treatment site through tracts, lumens or vessels within the body. The flexible nature and reduced radius of the radially
2 compressed stent enables delivery through relatively small and curved tracts, lumens or vessels. In percutaneous transluminal angioplasty, an implantable endoprosthesis is introduced through a small percutaneous puncture site, airway, or port and is passed through various body vessels to the treatment site.
After the stent is positioned at the treatment site, the delivery tool is actuated to release the positioned stent. The stent is allowed to self-expand within the body vessel.
The delivery tool is then removed from the patient. The stent remains in the vessel at the treatment site as an implant. Typically the delivery tool is designed for single use and so it is thrown away.
Stents must exhibit a relatively high degree of biocompatibility since they are implanted in the body. An endoprosthesis may be delivered into a body tract, vessel or lumen on or within a surgical delivery tool as shown in United States Patent Numbers 4,954,126 and 5,026,377. Preferred delivery tools for the present invention may include modifications of those delivery tools so that there cooperate and interact with the present invention.
Commonly used materials for known stent filaments include Eigiloy and Phynox metal spring alloys. Other metallic materials than can be used for self-expanding stent filaments are 316 stainless steel, MP35N alloy, and superelastic Nitinol nickel-titanium. Another self expanding stent, available from Schneider (USA) Inc. of Minneapolis, Minnesota, has a radiopaque clad composite structure such as shown in U.S. Patent No. 5,630,830 to Mayer. Self-expanding stents can be made of a Titanium Alloy. The strength and modulus of elasticity of the filaments forming the stents are also important characteristics. Elgiloy, Phynox, MP35N and stainless steel are all high strength and high modulus metals.
Nitinol has relatively low strength and modulus but includes temperature dependent self expanding or superelastic properties that have benefits.
There is continued growth in procedures and applications of self-expanding stents with particular characteristics for use in various medical indications. Stents are needed for implantation in an ever increasing list of lumens and vessels throughout the patient's body. Different physiological
3 PCT/US99/10305 environments are encountered and it is recognized that there is no universally acceptable set of stent characteristics.
High health care costs demand medical devices that can be sterilized and reused but heretofore stent delivery instruments were supplied by their manufacturers loaded with a stent and thus prepared for a single use and then disposal. That approach was acceptable for the introduction of stent vascular and lumenal surgery but was not cost effective. The need for equipment and techniques for loading stents into a delivery tool has not been addressed so that medical practitioners can do so in the preoperating room environment. Moreover the use of a sterilizable reusable delivery tool depends on an easy and effective loading device and fool proof method of use.
4 Summary of the Invention A device for loading a self expanding stent into a deployment tool may have an outer tube defining a space. The device might include a constricting sheath with a stent delivery end and a stent receiving opening opposite thereto.
The constricting sheath is preferably open therethrough with the stent delivery end and the stent receiving opening aligned along an axis thereof. There is an outer tube on the deployment tool. The stent delivery end is most preferably shaped and sized for slipping over the outer tube. The stent receiving opening might be shaped and sized to receive a self expanding stent aligned along the axis and in its expanded state. A rest within the delivery end can possibly be located for seating the constricting sheath along the axis and in position over the outer tube. A funnel is preferably positioned within the constricting sheath located between the stent delivery end and the stent receiving opening. The funnel is most preferably shaped for collapsing the self expanding stent before loading into the space of the outer tube. An inserter may be depressed for movement along the axis and within the constricting sheath towards the space. The inserter could have a stent carrying shaft to support the expanded stent thereabout and cantilever therefrom. A shoulder on the stent carrying shaft engages the expanded stent for most preferably urging the expanded stent into the constricting sheath as the inserter moves towards and into the funnel of the constricting sheath. A method for using the device includes the steps of slipping over the outer tube, seating the constricting sheath along the axis and in position over the outer tube and against the rest, collapsing the self expanding stent before loading into the space of the outer tube in the funnel, carrying the stent on the stent carrying shaft cantilever therefrom, depressing the inserter for movement along the axis and within the constricting sheath towards the space of the outer tube, and engaging the stent with the shoulder for urging the expanded stent into the constricting sheath as the inserter moves towards and into the funnel.

Using a deployment tool with the handle in the deployed position, the constricting sheath is slipped over the deployment tool outer tubing until tubing rests against sheath. By depressing device inserter towards deployment tool, the device moves towards and into a necked down funnel section of the constricting
5 sheath and comes in contact with an inserter stop. The device pushes the inserter back into the outer tubing and device is gripped between outer tube and inserter tube is retracted drawing device into outer tubing. When collapsible device is completely inside outer tube, the constructing sheath may be removed and the device is ready for deploying.
Brief Description of the Drawinas Figure 1 shows in cross section a device for loading a self expanding stent into a deployment tool having an outer tube defining a space.
Figure 2 shows in cross section a cartridge for the device for loading a self expanding stent into a deployment tool having an outer tube defining a space but it is shown in its shipping position and not its loading position.
6 Detailed Description of the Drawings In Figure 1 a device 10 for loading a self expanding stent 11 into a deployment tool 12 is shown. The deployment tool 12 has an outer tube 13 defining a space 14. The device 10 has a constricting sheath 15 with a stent delivery end 16 and a stent receiving opening 17 opposite thereto. The constricting sheath 15 is open therethrough with the stent delivery end 16 and the stent receiving opening 17 aligned along an axis "A" thereof. The stent delivery end 16 is shaped and sized for slipping over the outer tube 11. The stent receiving opening 17 is shaped and sized to receive the self expanding stent 11 aligned along the axis "A" and in its expanded state, see Figures 1 and 2. A rest 18 within the stent delivery end 16 is located for seating the constricting sheath 15 along the axis "A" and in position over the outer tube 11.
A funnel 19 is positioned within the constricting sheath 15 located between the stent delivery end 16 and the stent receiving opening 17. The funnel 19 is shaped for collapsing the self expanding stent 11 before loading into the space 14 of the outer tube 13. An inserter 20 is depressed for movement along the axis "A" and within the constricting sheath 15 towards the space 14. The inserter 20 has a stent carrying shaft 21 to support the expanded stent 11 thereabout and cantilever therefrom. A shoulder 22 on the stent carrying shaft 21 engages the expanded stent 11 for urging the expanded stent 11 into the constricting sheath 15 as the inserter 20 moves towards and into the funnel 19 of the constricting sheath 15. The rest 18 is sized to constrain the stent 11 slightly more than the space 14 of the outer tube 11. The constraining sheath 15 can be a cartridge 23 for the delivery of the stent 11 into the space 14 of a deployment tool 12. A pilot bushing 24 is positioned in the stent receiving opening 17 to support and guide the inserter 20 along the axis "A" as best seen in Figure 2. A cover 25 fits over the stent delivery end 16 so the cover 25, the inserter 20, the pilot bushing 24 and the constraining sheath 15 form the sealed cartridge 23. In Figure 2 the inserter 20 is shown in its shipping position.
To use this configuration to deliver the expandable stent 11 into the funnel 19, the inserter 20 is pulled out along axis "A", reversed and inserted into the
7 expandable stent 11. Thus, shoulder 22 in Figure 2 is shown outside the cartridge 23. This approach may be necessary for a polymeric or bioresorbable stent that cannot be stored for any length of time in its collapsed state.
A method for using the device 10 includes slipping over the outer tube 13 the constricting sheath 15, seating the constricting sheath 15 along the axis "A" and in position over the outer tube 13 and against the rest 18, collapsing the self expanding stent 11 before loading into the space 14 of the outer tube 13 in the funnel 19, carrying the expandable stent 11 on the stent carrying shaft 21 cantilever therefrom, depressing the inserter 20 for movement along the axis "A" and within the constricting sheath 15 towards the space 14 of the outer tube 13, and engaging the stent 11 with the shoulder 22 for urging the expanded stent 11 into the constricting sheath 15 as the inserter 20 moves towards and into the funnel 19.

Claims (6)

What is claimed is:
1. A device (10) for loading a self expanding stent (11) into a deployment tool (12) having an outer tube (13) defining a space (14), the device (10) comprising:
a constricting sheath (15) with a stent delivery end (16) and a stent receiving opening (17) opposite thereto, the constricting sheath (15) open therethrough with the stent delivery end (16) and the stent receiving opening (17) aligned along an axis thereof, the stent delivery end (16) shaped and sized for slipping over the outer tube (13), the stent receiving opening (17) shaped and sized to receive a self expanding stent (11) aligned along the axis and in its expanded state;
a rest (18) within the delivery end (16) located for seating the constricting sheath (15) along the axis and in position over the outer tube (13);
a funnel (19) positioned within the constricting sheath (15) located between the stent delivery end (16) and the stent receiving opening (17), the funnel (19) shaped for collapsing the self expanding stent (11) before loading into the space (14) of the outer tube (13);
an inserter (20) depressed for movement along the axis and within the constricting sheath (15) towards the space (14) of the outer tube (13), the inserter (20) having a stent carrying shaft (21) to support the expanded stent (11) thereabout and cantilever therefrom, and a shoulder (22) on the stent carrying shaft (21) to engage the expanded stent (11) for urging the expanded stent (11) into the constricting sheath (15) as the inserter (20) moves towards and into the funnel (19) of the constricting sheath (15).
2. The device (10) of claim 1 wherein the rest (18) is sized to constrain the stent (11) slightly more than the space (14) of the outer tube (13).
3. The device (10) of claim 1 wherein the constraining sheath (15) is a cartridge (23) for the delivery of the stent (11) into the space (14) of a deployment tool (12).
4. The device (10) of claim 3 wherein a pilot bushing (24) is positioned in the stent receiving opening (17) to support and guide the inserter (20) along the axis.
5. The device (10) of claim 4 wherein a cover (25) fits over the stent delivery end (16) so the cover (25), the inserter (20), the pilot bushing (24) and the constraining sheath (15) form the sealed cartridge (23).
6. A method for using a device (10) for loading a self expanding stent (11) into a deployment tool (12) having an outer tube (13) defining a space (14), the method have the steps of:
slipping over the outer tube (13) a constricting sheath (15) with a stent delivery end (16) and a stent receiving opening (17) opposite thereto, the constricting sheath (15) open therethrough with the stent delivery end (16) and the stent receiving opening (17) aligned along an axis, the stent receiving opening (17) shaped and sized to receive a self expanding stent (11) aligned along the axis and the stent (11) in its expanded state;
seating the constricting sheath (15) along the axis and in position over the outer tube (13) and against a rest (18) located within the delivery end (16);
collapsing the self expanding stent (11) before loading into the space (14) of the outer tube (13) in a funnel (19) positioned within the constricting sheath (15) between the stent delivery end (16) and the stent receiving opening (17);

carrying the stent (11) on a stent carrying shaft (21) to support the expanded stent (11) thereabout and cantilever therefrom;
depressing an inserter (20) for movement along the axis and within the constricting sheath (15) towards the space (14) of the outer tube (13), and engaging the stent (11) with a shoulder (22) on the stent carrying shaft (21) for urging the expanded stent (11) into the constricting sheath (15) as the inserter (20) moves towards and into the funnel (19) of the constricting sheath (15).
CA002317578A 1998-05-15 1999-05-11 Method and device for loading a stent Expired - Fee Related CA2317578C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/079,842 US6132458A (en) 1998-05-15 1998-05-15 Method and device for loading a stent
US09/079,842 1998-05-15
PCT/US1999/010305 WO1999059503A1 (en) 1998-05-15 1999-05-11 Method and device for loading a stent

Publications (2)

Publication Number Publication Date
CA2317578A1 CA2317578A1 (en) 1999-11-25
CA2317578C true CA2317578C (en) 2007-08-21

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Family Applications (1)

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CA002317578A Expired - Fee Related CA2317578C (en) 1998-05-15 1999-05-11 Method and device for loading a stent

Country Status (11)

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US (2) US6132458A (en)
EP (1) EP1077656B1 (en)
JP (1) JP4299462B2 (en)
KR (1) KR100550723B1 (en)
AU (1) AU738990B2 (en)
CA (1) CA2317578C (en)
DE (1) DE69926879T2 (en)
ES (1) ES2249004T3 (en)
MX (1) MXPA00011241A (en)
TW (1) TW377290B (en)
WO (1) WO1999059503A1 (en)

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CA2317578A1 (en) 1999-11-25
TW377290B (en) 1999-12-21
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US6132458A (en) 2000-10-17
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