System, apparatus, and method for grafting tissue

Patent metadata

Field	Value
Publication number	US-10080570-B2
Application number	US-201715582287-A
Country	US
Kind code	B2
Filing date	Apr 28, 2017
Priority date	Dec 10, 2012
Publication date	Sep 25, 2018
Grant date	Sep 25, 2018

Abstract

Systems, apparatus, and methods may be adapted for grafting tissue at a tissue site that may include an elongate housing and a plurality of elongate cutting members. The plurality of elongate cutting members may define a cutting surface at a distal end of the elongate housing. The cutting surface may be adapted to contract from a first diameter to a second diameter that is less than the first diameter. The contraction of the cutting surface from the first diameter to the second diameter may define a tapered profile between the first diameter and the second diameter suitable for obtaining a tapered graft.

First claim

What is claimed is:

1. A method of grafting tissue at a tissue site, comprising:
inserting a tapered graft tissue having an external taper into a corresponding tapered socket at the tissue site, wherein the tapered graft tissue having an external taper is obtained by:
positioning a plunger at a distal end of an elongate housing defining a bore having a longitudinal axis to place an annular cutting surface defined by a plurality of elongate cutting members in a first diameter, the plunger having an external surface slidably disposed in the bore of the elongate housing, and wherein the elongate cutting members are biased against the external surface of the plunger at the distal end of the elongate housing;
inserting the annular cutting surface longitudinally into a donor tissue source;
displacing the plunger toward a proximal end of the elongate housing with donor tissue entering the bore of the elongate housing as the annular cutting surface advances into the donor tissue source; and
contracting the annular cutting surface from the first diameter to a second diameter that is less than the first diameter along a tapered profile as the plunger is displaced.

2. The method of claim 1 , wherein the tapered graft tissue is adapted to self-align with the tapered socket at the tissue site.

3. A method of grafting tissue at a tissue site, comprising:
obtaining a tapered graft tissue having an insertion end and an exposed end separated by a length, the tapered graft tissue having a first diameter at the exposed end that is larger than a second diameter at the insertion end, the length between the first diameter and the second diameter defining an external taper, wherein said tapered graft tissue defining an external taper is obtained by:
positioning a plunger at a distal end of an elongate housing defining a bore having a longitudinal axis to place an annular cutting surface defined by a plurality of elongate cutting members in a first diameter, the plunger having an external surface slidably disposed in the bore of the elongate housing, and wherein the elongate cutting members are biased against the external surface of the plunger at the distal end of the elongate housing;
inserting the annular cutting surface longitudinally into a donor tissue source;
displacing the plunger toward a proximal end of the elongate housing with donor tissue entering the bore of the elongate housing as the annular cutting surface advances into the donor tissue source; and
contracting the annular cutting surface from the first diameter to a second diameter that is less than the first diameter along a tapered profile as the plunger is displaced;
preparing a tapered socket in the tissue site for receiving the tapered graft tissue, the tapered socket defining an internal taper that substantially corresponds to the external taper of the tapered graft tissue; and
inserting the tapered graft tissue into the tapered socket.

4. A method of grafting tissue at a tissue site, comprising:
positioning a plunger at a distal end of an elongate housing having a proximal end and a bore defining a longitudinal axis to place an annular cutting surface in a first diameter, the annular cutting surface defined by a plurality of elongate cutting members extending lengthwise at the distal end of the elongate housing and positioned about the longitudinal axis of the elongate housing, the annular cutting surface adapted to contract from the first diameter to a second diameter that is less than the first diameter thereby defining a tapered profile between the first diameter and the second diameter, the plunger having an external surface slidably disposed in the bore of the elongate housing, and wherein the elongate cutting members are biased against the external surface of the plunger at the distal end of the elongate housing;
inserting the annular cutting surface longitudinally into a donor tissue source;
displacing the plunger toward the proximal end of the elongate housing with donor tissue entering the bore of the elongate housing as the annular cutting surface advances into the donor tissue source;
obtaining a tapered graft tissue having an external taper by contracting the annular cutting surface from the first diameter to the second diameter along the tapered profile as the plunger is displaced;
reaming a tapered socket in the tissue site for receiving the tapered graft tissue, the tapered socket defining an internal taper that substantially corresponds to the external taper of the tapered graft tissue; and
inserting the tapered graft tissue into the tapered socket.

5. The method of claim 4 , wherein the bore of the elongate housing has a substantially constant internal diameter along a length of the elongate housing.

6. The method of claim 4 , wherein the first diameter of the annular cutting surface is substantially concentric with the second diameter of the annular cutting surface.

7. The method of claim 4 , wherein the plunger further comprises a plunger guide rod adapted to extend from the plunger along the longitudinal axis of the elongate housing.

8. The method of claim 4 , wherein the elongate housing further comprises an arbor positioned at the proximal end of the elongate housing and substantially aligned with the longitudinal axis of the elongate housing.

9. The method of claim 8 , wherein the arbor comprises an impact surface adapted to receive blows from a hammer.

10. The method of claim 8 , wherein the arbor is adapted to couple the elongate housing to a surgical drill.

11. The method of claim 8 , wherein the plunger further comprises a plunger guide rod adapted to extend from the plunger along the longitudinal axis of the elongate housing, the arbor having an aperture adapted to receive an end of the plunger guide rod.

12. The method of claim 4 , wherein the elongate housing further comprises a plurality of grasping handles positioned near the proximal end of the elongate housing.

13. The method of claim 4 , wherein the annular cutting surface is inserted into the donor tissue source without rotation.

14. The method of claim 4 , wherein the annular cutting surface is inserted into the donor tissue source with rotation.

15. The method of claim 4 , wherein the plurality of elongate cutting members each comprise at least one cutting tip.

Assignees

• Univ Missouri

Inventors

• Pfeiffer Ferris M
• Stoker Aaron M
• Cook James L

Classifications

• B23B51/0453

  with ejecting devices · CPC title

• A61B17/1635 Primary

  for grafts, harvesting or transplants · CPC title

• B23B2251/428

  Operations & Transport · mapped topic

• A61B17/1613

  Component parts · CPC title

• B23B2251/54

  Operations & Transport · mapped topic