Implant insertion device

• US 5,782,830 A
• Filed: 07/10/1996
• Issued: 07/21/1998
• Est. Priority Date: 10/16/1995
• Status: Expired due to Term

• Current Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Original Assignee: SDGI Holdings Incorporated (Medtronic Plc)
• Inventors: Farris, Robert A.
• Primary Examiner(s): ISABELLA, DAVID J
• Application Number:
  US08/677,794
• Time in Patent Office: 741 Days
• Field of Search: 606/205, 606/206, 606/207, 606/60-80, 606/86, 606/87, 606/88, 606/96, 606/97, 606/98, 623/17
• US Class Current: 606/99
• CPC Class Codes: A61F 2/30724 Spacers for centering an implant in a bone cavity, e.g. in a cement-receiving cavity
• CPC Class Codes: A61F 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• CPC Class Codes: A61F 2/442 Intervertebral or spinal discs, e.g. resilient non-disc-shaped intervertebral inflatable pockets A61F2/441; non-disc-shaped intervertebral fusion implants A61F2/4455
• CPC Class Codes: A61F 2/4455 for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages intervertebral discs A61F2/442
• CPC Class Codes: A61F 2/4603 for insertion or extraction of endoprosthetic joints or of accessories thereof
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/2817 Bone stimulation by chemical reactions or by osteogenic or biological products for enhancing ossification, e.g. by bone morphogenetic or morphogenic proteins [BMP] or by transforming growth factors [TGF]
• CPC Class Codes: A61F 2002/2835 Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
• CPC Class Codes: A61F 2002/30062 (bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
• CPC Class Codes: A61F 2002/30112 Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2002/30153 rectangular
• CPC Class Codes: A61F 2002/30187 D-shaped or half-disc-shaped
• CPC Class Codes: A61F 2002/30261 parallelepipedal
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30677 Means for introducing or releasing pharmaceutical products, e.g. antibiotics, into the body
• CPC Class Codes: A61F 2002/30828 parallel
• CPC Class Codes: A61F 2002/3092 having an open-celled or open-pored structure
• CPC Class Codes: A61F 2002/30929 having at least two superposed coatings
• CPC Class Codes: A61F 2002/4622 having the shape of a forceps or a clamp
• CPC Class Codes: A61F 2002/4627 with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
• CPC Class Codes: A61F 2002/4628 : with linear motion along or rotating motion about an axis transverse to the instrument axis or to the implantation direction, e.g. clamping
• CPC Class Codes: A61F 2210/0004 : bioabsorbable
• CPC Class Codes: A61F 2230/0004 : Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2230/0019 : rectangular
• CPC Class Codes: A61F 2230/0034 : D-shaped
• CPC Class Codes: A61F 2230/0082 : parallelepipedal
• CPC Class Codes: A61F 2310/00161 : Carbon; Graphite
• CPC Class Codes: A61F 2310/00293 : containing a phosphorus-containing compound, e.g. apatite
• CPC Class Codes: A61F 2310/00491 : Coating made of niobium or Nb-based alloys
• CPC Class Codes: A61F 2310/00544 : Coating made of tantalum or Ta-based alloys
• CPC Class Codes: A61F 2310/00796 : Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite
• CPC Class Codes: A61L 2430/38 : for reconstruction of the spine, vertebrae or intervertebral discs
• CPC Class Codes: A61L 31/024 : Carbon; Graphite
• CPC Class Codes: A61L 31/026 : Ceramic or ceramic-like structures, e.g. glasses
• CPC Class Codes: A61L 31/044 : Collagen
• CPC Class Codes: A61L 31/047 : Other specific proteins or polypeptides not covered by A61L31/044 - A61L31/046
• CPC Class Codes: A61L 31/048 : obtained by reactions only involving carbon-to-carbon unsaturated bonds A61L31/041 takes precedence
• CPC Class Codes: A61L 31/06 : obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds A61L31/041 takes precedence

Abstract

One embodiment of an implant insertion device includes a handle, a shaft having a proximal end attached to the handle and a distal end and a pair of jaws each having a first end attached to the distal end of the shaft, a free second end and a gripping element at the second end. The free ends of the jaws are movable between gripping positions to grasp the implant between the gripping elements and releasing positions to release the implant. The jaws are biased apart to the releasing positions. Each of the gripping elements defines a substantially uniform or flat gripping surface. In some embodiments the gripping surfaces include teeth. The gripping surfaces face one another to contact the surface of the implant when the jaws are in the gripping positions. The devices of this invention also include a hollow sleeve slidably disposed over the jaws for forcing the jaws together towards the gripping positions.

Claims

1. An implant insertion device, comprising:

a handle;

a shaft having a proximal end and a distal end, said proximal end attached to said handle;

a pair of jaws each having a first end attached to said distal end of said shaft and a free second end, each of said free ends including a gripping element, said free ends of said jaws movable between gripping positions to grasp the implant between said gripping elements and releasing positions to release the implant, said first ends of said jaws forming a first angle in said releasing positions and a smaller second angle in said gripping positions,

a substantially uniform gripping surface defined on each said gripping element, said gripping surfaces facing one another to contact only the surface of the implant when said jaws are in the gripping positions; and

an actuator operable on said jaws to force said jaws together towards said gripping positions, said actuator includes a hollow sleeve slidably mounted on said shaft and defining an inner bore for receiving said shaft and said first ends of said jaws, said sleeve slidable between a first position adjacent said handle and a second engaging position spaced from said first position in a location between said first position and said free ends of said jaws, said sleeve forcing said jaws together when said sleeve is in the engaging position.

2. The device of claim 1 wherein a portion of said inner bore adjacent said jaws includes a flared portion, said flared portion defining said first angle to accommodate said jaws when said jaws are in said releasing position.

3. The device of claim 1 wherein said gripping surfaces include surface roughenings.

4. The device of claim 1 wherein said gripping surfaces include knurlings.

5. The device of claim 1 wherein said gripping surfaces includes a plurality of teeth.

6. The device of claim 5 wherein said teeth are saw teeth.

7. The device of claim 6 wherein said saw teeth each include a trailing surface that is angled back from said jaws toward said handle.

8. The device of claim 1 wherein each of said jaws includes a bend at said free end, each said bend defining a platform for the implant when said jaws are in said gripping positions.

9. The device of claim 1 further comprising a resilient joint between said first ends of said jaws, said jaws each including an elongate arm made of a resilient material.

10. The device of claim 9 wherein said joint includes a notch defined in said shaft.

11. The device of claim 1 wherein said handle includes a gripping surface defining knurlings for gripping the handle.

12. The device of claim 1 wherein said jaws each include an elongate arm between said first end and said gripping element, each said arm having a width and said bore having an inner dimension substantially equal to twice said width.

13. The device of claim 1 further comprising biasing means for biasing the jaws apart to said releasing position.

14. The device of claim 13 wherein said biasing means includes said jaws having elongate arms that are curved apart relative to each other.

15. The device of claim 13 wherein said biasing means includes a resilient hinge between said jaws.

16. The device of claim 13 wherein said biasing means includes said jaws having elongate arms that are formed apart relative to each other.