Retrograde reamer depth tube gage

Patent metadata

Field	Value
Publication number	US-10028800-B2
Application number	US-201715463529-A
Country	US
Kind code	B2
Filing date	Mar 20, 2017
Priority date	May 29, 2014
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

A thickness gage including a transparent measurement tube configured to receive and be slidingly engaged over a tubular shaft of a retrograde reamer. The tubular shaft has linear graduation marks on its surface for identifying linear measures for use in measuring a thickness of a bridge bone gap. The linear graduation marks are located on the tubular shaft surface such that at least some of the linear graduation marks can be observed through the transparent measurement tube. Each linear graduation mark, when aligned with a proximal end of the measurement tube, provides a linear measure of the distance between a distal end of the measurement tube and a cutting member of the retrograde reamer positioned so that its central axis is disposed at a non-zero angle relative to a longitudinal axis of the tubular shaft. Such a distance corresponds to the thickness of the bridge bone gap.

First claim

What is claimed is:

1. A device for measuring a thickness of target material, the device being configured for use in conjunction with a retrograde drill including a tubular shaft, a drill bit disposed at a distal end of the tubular shaft, and at least one cutting member moveably disposed adjacent the distal end of the tubular shaft, the device comprising:
a substantially transparent measurement tube having a proximal end and a distal end, the measurement tube being configured to receive and be slidingly engaged over the tubular shaft of the retrograde drill,
wherein the cutting member of the retrograde drill is operative to move between a first position where a central axis thereof is coincident with a longitudinal axis of the tubular shaft of the retrograde drill, and a second position where the central axis thereof is disposed at a non-zero angle relative to the longitudinal axis of the tubular shaft of the retrograde drill,
wherein the tubular shaft of the retrograde drill has a plurality of linear graduation marks on a surface thereof for identifying a plurality of linear measures, respectively, at least some of the plurality of linear graduation marks being observable through the substantially transparent measurement tube, and
wherein each of the plurality of linear graduation marks aligned with the proximal end of the measurement tube provides a respective linear measure of a distance between the distal end of the measurement tube and the cutting member of the retrograde drill disposed in the second position, the respective linear measure corresponding to the thickness of the target material remaining while drilling or after having drilled a tunnel or bore through the target material using the retrograde drill.

2. The device of claim 1 wherein the measurement tube is substantially rigid.

3. The device of claim 1 wherein the measurement tube is made of a material selected from the group consisting of plastic and surgical grade plastic.

4. The device of claim 1 wherein the target material is bone, and wherein the measurement tube is operative to measure, in a ligament surgery procedure, the thickness of the bone remaining while drilling or after having drilled the tunnel or bore through the bone using the retrograde drill.

5. A system for measuring a thickness of target material comprising:
a retrograde drill including a tubular shaft having a surface, a distal end, and a longitudinal axis, a drill bit disposed at the distal end of the tubular shaft, and at least one cutting member having a central axis, the cutting member being moveably disposed adjacent the distal end of the tubular shaft; and
a substantially transparent measurement tube having a proximal end and a distal end, the measurement tube being configured to receive and be slidingly engaged over the tubular shaft of the retrograde drill,
wherein the cutting member is operative to move between a first position where the central axis thereof is coincident with the longitudinal axis of the tubular shaft and a second position where the central axis thereof is disposed at a non-zero angle relative to the longitudinal axis of the tubular shaft, the retrograde drill being operative to drill, in a retrograde fashion, at least one tunnel or bore through the target material with the cutting member of the retrograde drill disposed in the second position,
wherein the tubular shaft of the retrograde drill has a plurality of linear graduation marks on the surface thereof for identifying a plurality of linear measures, respectively, at least some of the plurality of linear graduation marks being observable through the substantially transparent measurement tube, and
wherein each of the plurality of linear graduation marks aligned with the proximal end of the measurement tube provides a respective linear measure of a distance between the distal end of the measurement tube and the cutting member of the retrograde drill disposed in the second position, the respective linear measure corresponding to the thickness of the target material remaining while drilling or after having drilled, in the retrograde fashion, the at least one tunnel or bore through the target material.

6. The system of claim 5 wherein the measurement tube is substantially rigid.

7. The system of claim 5 wherein the measurement tube is made of a material selected from the group consisting of plastic and surgical grade plastic.

8. The system of claim 5 wherein the retrograde drill is further operative to drill, in an antegrade fashion using the drill bit, at least another tunnel or bore through the target material with the cutting member of the retrograde drill disposed in the first position.

9. The system of claim 8 wherein the retrograde drill is further operative to drill, in the retrograde fashion, the at least one tunnel or bore through the target material, and to drill, in the antegrade fashion, the at least another tunnel or bore through the target material, along substantially the same path through the target material.

10. The system of claim 5 wherein the retrograde drill is further operative, while drilling the at least one tunnel or bore, to spin freely independent of the measurement tube.

11. The system of claim 5 wherein the target material is bone, and wherein the measurement tube is operative to measure, in a ligament surgery procedure, the thickness of the bone remaining while drilling or after having drilled the at least one tunnel or bore through the bone using the retrograde drill.

12. A method of measuring a thickness of target material, comprising:
providing a retrograde drill including a tubular shaft having a surface, a distal end, and a longitudinal axis, a drill bit disposed at the distal end of the tubular shaft, and at least one cutting member having a central axis, the cutting member being moveably disposed adjacent the distal end of the tubular shaft;
providing a substantially transparent measurement tube having a proximal end and a distal end, the measurement tube being configured to receive and be slidingly engaged over the tubular shaft of the retrograde drill;
moving the culling member of the retrograde drill from a first position where the central axis thereof is coincident with the longitudinal axis of the tubular shaft, to a second position where the central axis thereof is disposed at a non-zero angle relative to the longitudinal axis of the tubular shaft;
drilling, in a retrograde fashion by the retrograde drill, at least one tunnel or bore through the target material with the cutting member of the retrograde drill disposed in the second position, the tubular shaft of the retrograde drill having a plurality of linear graduation marks on the surface thereof for identifying a plurality of linear measures, respectively, at least some of the plurality of linear graduation marks being observable through the substantially transparent measurement tube; and
aligning a respective one of the plurality of linear graduation marks with the proximal end of the measurement tube to provide a respective linear measure of a distance between the distal end of the measurement tube and the cutting member of the retrograde drill disposed in the second position, the respective linear measure corresponding to the thickness of the target material remaining while drilling or after having drilled, in the retrograde fashion, the at least one tunnel or bore through the target material.

13. The method of claim 12 further comprising:
drilling, in an antegrade fashion by the retrograde drill using the drill bit, at least another tunnel or bore through the target material with the cutting member of the retrograde drill disposed in

Assignees

• Smith & Nephew Inc

Inventors

• Bourque Bernard J
• Callaghan David J

Classifications

• A61B2090/062

  penetration depth · CPC title

• A61B17/1615

  Drill bits, i.e. rotating tools extending from a handpiece to contact the worked material · CPC title

• A61B90/06 Primary

  Measuring instruments not otherwise provided for · CPC title

• A61B17/1714

  for applying tendons or ligaments (implements for applying tendons or ligaments A61F2/0805) · CPC title

• A61B17/1633

  Sleeves, i.e. non-rotating parts surrounding the bit shaft, e.g. the sleeve forming a single unit with the bit shaft (A61B17/1644 takes precedence) · CPC title