Meniscal transplant system

Patent metadata

Field	Value
Publication number	US-2016270933-A1
Application number	US-201615074982-A
Country	US
Kind code	A1
Filing date	Mar 18, 2016
Priority date	Mar 20, 2015
Publication date	Sep 22, 2016
Grant date	—

Abstract

A workstation having a pair of posts on either side of a clamping plate where a donor bone may be placed on sequentially cut in three separate cutting paths. Cutting gates are attached to the posts and used to provide cutting paths that can be precisely oriented with respect to the meniscus of the donor bone part using visual alignment without any manual measurements. The graft is affixed to a machining clamp and shaved to appropriately shape the sides and form a radius on the bottom of the graft. A tibia is then prepared by using a drill guide to form a pilot hole and then to drill out a large hole for the graft. The drilled hole is expanded and shaped using a rod guide and chisel and then a rasp. The shaped graft may then be implanted into the shaped hole and sutured in place.

First claim

What is claimed is:

1 . A system for preparing a meniscus bone graft having a bone portion and a meniscus extending from the bone portion by a pair of meniscal horns, comprising:
a workstation having a base; a pair of posts extending upwardly from the base and defining an axis therebetween; a plate positioned between the posts and defining a horizontal plane; a clamp having an arm extending over the plate; a first cutting gate that may be removably coupled to the pair of posts to define a first cutting path that extends along a first plane that intersects with the horizontal plane of the plate at a first non-perpendicular angle and that is proximally offset from the axis of the pair of posts; a second cutting gate that may be removably coupled to the pair of posts to define a second cutting path that extends along a second plane that is perpendicular to vertical and that may be adjusted to be aligned with an axis extending between the pair of meniscal horns of the meniscus bone graft when the meniscus bone graft is positioned on the plate; a third cutting gate that may be removably coupled to the pair of posts to define a third cutting path that extends along a third plane that intersects with the horizontal plane of the plate at a second non-perpendicular angle and that is distally offset from the axis of the pair of posts.

2 . The system of claim 1 , wherein the third cutting gate comprises the first cutting gate reversibly coupled to the posts.

3 . The system of claim 2 , further comprising a depth setting groove extending along the base.

4 . The system of claim 3 , further comprising a clamp configured to attached to a graft positioned in the depth setting groove.

5 . The system of claim 4 , further comprising a first shaver having blades for shaping the graft into a first shape.

6 . The system of claim 5 , further comprising a second shaver having blades for shaping the graft into a second shape that is different than the first shape.

7 . The system of claim 6 , further comprising a measuring groove having a profile that corresponds to the first and second shapes extending along the base and having indicia positioned therealong for verifying the length and the cross-sectional shape of a graft positioned in the measuring groove.

8 . The system of claim 7 , further comprising a drill guide having a throughbore and an adjustable hook beam that extends from a proximal end through the drill guide throughbore to a distal end that may be affixed over a tibia into which a graft is to be implanted.

9 . The system of claim 8 , further comprising a pilot guide that can be inserted into the throughbore of the drill guide and a pilot drill bit having a pilot drill stop that can be extended through the pilot guide until the pilot drill stop contacts the proximate end of the hook beam.

10 . The system of claim 9 , further comprising a guide pin that can be extended through the throughbore of the drill guide and a cannulated drill bit having drill stop that can be extended through the pilot guide and over the guide pin until the drill stop contacts the proximate end of the hook beam to form an implant hole in the tibia into which the graft is to be implanted.

11 . The system of claim 10 , further comprising a guide rod that may be positioned in the implant hole and a chisel having a handle that can slidingly advance along the guide rod into the tibia to shape the implant hole until the guide rod extends into the handle of the chisel a predetermined distance.

12 . A method for preparing a meniscus bone graft, comprising the steps of:
clamping a donor bone part having a meniscus extending from the donor bone part by a pair of meniscal horns to a plate that extends along a horizontal plane using a clamp on a workstation; positioning a first cutting gate over a pair of posts extending upwardly from the workstation on either side of the plate to define an axis therebetween; cutting the donor bone part along a first cutting path defined by the first cutting gate that extends along a first plane that intersects with the horizontal plane of the plate and that is proximally offset from the axis of the pair of posts and the pair of meniscal horns; positioning a second cutting gate over the pair of posts and adjusting the alignment of the second cutting gate to be parallel with an axis the extends between the pair of meniscal horns; cutting the donor bone part along a second cutting path defined by the second cutting gate that extends along a second plane that is parallel to the horizontal plane and in alignment with the axis of the pair of meniscal horns; positioning a third cutting gate over the pair of posts; cutting the donor bone part along a third cutting path defined by the third cutting gate that extends along a third plane that intersects with the horizontal plane of the plate and that is distally offset from the axis of the pair of posts and the pair of meniscal horns to form a graft having two lateral sides defined by the first and third cutting paths, a bottom defined by the second cutting path, and a top having the meniscus attached to the bone implant by meniscal horns; placing the graft in a first groove and attaching a clamp to the graft; using the clamp to move the graft along a first shaver having a first set of blades to shape the graft into a first shape; and using the clamp to move the graft along a second shaver having a second set of blades to shape the graft into a second shape that is different than the first shape.

13 . The method of claim 12 , wherein the third cutting gate comprises the first cutting gate reversibly coupled to the posts.

14 . The method of claim 13 , further comprising the step of attaching a drill guide having a throughbore and an adjustable hook beam that extends from a proximal end through the drill guide proximately to the throughbore to a distal end over a tibia into which the graft is to be implanted.

15 . The method of claim 14 , further comprising the step of using a pilot guide inserted into the throughbore of the drill guide and a pilot drill bit having a pilot drill stop to drill a pilot hole into the tibia until the pilot drill stop contacts the proximate end of the hook beam.

16 . The method of claim 15 , further comprising the step of using a guide pin extended through the throughbore of the drill guide and the pilot hole and a cannulated drill bit having drill stop that can be extended through the pilot guide and over the guide pin to form an implant hole in the tibia.

17 . The method of claim 16 , further comprising the step of using a guide rod positioned in the implant hole and a chisel having a handle that can slidingly advance along the guide rod into the tibia to shape the implant hole until the guide rod extends into the handle of the chisel a predetermined distance.

18 . The method of claim 17 , further comprising the step of inserting the graft into the implant hole and suturing the meniscus to the tibia.

Assignees

• Conmed Corp

Inventors

• Bosworth Adrian E
• Miller Peter C

Classifications

• A61B2017/00969

  used for transplantation · CPC title

• A61B17/1675

  for the knee · CPC title

• A61B2090/062

  penetration depth · CPC title

• A61F2/4644 Primary

  Preparation of bone graft, bone plugs or bone dowels, e.g. grinding or milling bone material (bone material A61F2/28; disintegrating or milling devices B02C) · CPC title

• A61B17/1604

  Chisels; Rongeurs; Punches; Stamps · CPC title