Acetabular reamer

Patent metadata

Field	Value
Publication number	US-10568649-B2
Application number	US-201414270642-A
Country	US
Kind code	B2
Filing date	May 6, 2014
Priority date	May 6, 2014
Publication date	Feb 25, 2020
Grant date	Feb 25, 2020

Abstract

An acetabular reamer has a rotatable drive shaft extending along a first longitudinal central axis. A second housing surrounds at least a portion of the drive shaft, the first housing having a gripping arm. A drive motor in a first housing is coupled to a first end of the rotatable drive shaft for rotating the drive shaft. A reamer head is rotatably coupled to a second end of the rotatable drive shaft, the reamer head rotatable about a second axis extending at an acute angle with respect to the rotatable drive shaft first longitudinal. A releasable connector couples the first and second housing and prevent relative rotation between the first housing and the second housing.

First claim

The invention claimed is:

1. An acetabular reamer comprising:
a rotatable drive shaft extending along a first longitudinal central axis, the drive shaft having first and second ends;
a drive motor operatively coupled to the first end of the rotatable drive shaft for rotating the shaft;
a first housing enclosing the drive motor;
a second housing surrounding at least a first portion of the drive shaft, the second housing having a gripping portion;
a reamer cutting head rotatably coupled to the second end of the rotatable drive shaft, the reamer head rotatable about a second longitudinal central axis extending in a first direction at an acute angle with respect to the rotatable drive shaft first longitudinal central axis; and
a first releasable connector operatively coupling the first end of the rotatable drive shaft and the drive motor, a second releasable connector preventing relative rotation between the first housing and the second housing, and a third releasable connector coupling a second portion of the drive shaft and the reamer head,
wherein the second releasable connector is attached to the first housing at a first location on the second releasable connector and to the second housing at a second location on the second releasable connector, the second releasable connector being hollow with an inner diameter larger than an outer surface of the second housing,
wherein the first housing is the sole housing structure occupying a space interior to the inner diameter of the second releasable connector at the first location,
wherein the second housing is the sole housing structure occupying a space interior to the inner diameter of the second releasable connector at the second location, and
wherein the second releasable connector and a portion of the second housing abutting the second releasable connector are centered on the first longitudinal central axis.

2. The acetabular reamer as set forth in claim 1 , wherein the second housing encloses the entire rotatable drive shaft.

3. The acetabular reamer as set forth in claim 2 , wherein the drive motor is non-rotatably mounted in the first housing.

4. The acetabular reamer as set forth in claim 3 , wherein the drive motor is either electric or pneumatic.

5. The acetabular reamer as set forth in claim 2 , wherein the gripping portion of the second housing enclosing the drive shaft includes a mounting connector including an arm extending therefrom at a second acute angle relative to the second housing in a second direction opposite the first direction.

6. The acetabular reamer as set forth in claim 5 , wherein the arm is modular and may be releasably coupled to the second housing.

7. The acetabular reamer as set forth in claim 6 , wherein the second housing has at least two axially spaced mounting connector locations for receiving the arm.

8. The acetabular reamer as set forth in claim 7 , wherein a second mounting connector location is spaced axially along the second housing at a greater distance from the reamer cutting head than the first location.

9. The acetabular reamer as set forth in claim 5 , wherein the acute angle is 45°.

10. The acetabular reamer as set forth in claim 1 , wherein the drive shaft has a first axially extending portion along the first longitudinal central axis and a second axially extending portion along the second longitudinal central axis, the first and second longitudinal central axes intersecting at the acute angle.

11. The acetabular reamer as set forth in claim 10 , wherein the third releasable connector includes a universal joint coupling the rotatable drive shaft extending along the first longitudinal central axis to the reamer cutting head extending along the second longitudinal central axis.

12. The acetabular reamer as set forth in claim 10 , wherein the acute angle is 45°.

13. An acetabular reamer comprising:
a first housing containing a drive motor system having an output shaft therein extending out of the first housing along a first longitudinal axis;
a reamer portion having a second housing having an acetabular reamer drive shaft therein, the second housing having a first end housing a first end of the acetabular reamer drive shaft releasably connected to the output shaft, the acetabular reamer drive shaft having a second end operatively coupled to an acetabular reamer cutting head;
a modular arm extending from the second housing and adapted to be releasably coupled to the second housing; and
a sleeve attached to the first housing and the second housing, the sleeve being hollow and having an inner diameter larger than an outer surface of the second housing,
the first and second housing having interlocking portions for coupling the drive motor system to the acetabular reamer drive shaft and for attachment to the sleeve to prevent relative rotation between the first and second housings, the acetabular reamer drive shaft and the output shaft having interlocking portions capable of transferring power from the output shaft to a reamer drive system to the acetabular reamer cutting head,
wherein the first housing is the sole housing structure occupying a space within the sleeve at a first location where the sleeve is attached to the first housing,
wherein the second housing is the sole housing structure occupying a space within the sleeve at a second location where the sleeve is attached to the second housing,
wherein the second housing has a first attachment interface and a second attachment interface, and
wherein the first attachment interface and the second attachment interface are both adapted for receipt of the modular arm, the second attachment interface being spaced axially relative to the first attachment interface along a second longitudinal axis of the second housing such that the second attachment interface is further from the acetabular reamer cutting head than the first attachment interface.

14. The acetabular reamer as set forth in claim 13 , wherein the second housing encloses the entire rotatable acetabular reamer drive shaft.

15. The acetabular reamer as set forth in claim 14 , wherein drive system comprises a drive motor connected to the acetabular drive shaft, the drive motor being mounted in the first housing.

16. The acetabular reamer as set forth in claim 13 , wherein the first end of the acetabular reamer drive shaft extends in a first direction forming an acute angle with respect to the second end of the acetabular reamer drive shaft coupled to the acetabular reamer.

17. The acetabular reamer as set forth in claim 16 , wherein the second housing includes a gripping portion formed adjacent the first end of the acetabular reamer drive shaft and the modular arm extends from the second housing at a second acute angle relative to the second housing in a second direction opposite the first direction.

18. The acetabular reamer as set forth in claim 17 , wherein the acute angle is 45°.

19. The acetabular reamer as set forth in claim 13 , wherein the acetabular reamer drive shaft has a first axially extending portion along the second longitudinal axis and a second axially extending portion along a third longitudinal axis, the second and third longitudinal axis intersecting at an acute angle.

20. The acetabular reamer as set forth in claim 19 , wherein a connector including a universal joint couple the first axially extending portion of the acetabular reamer drive shaft to the second axially extending portion of the acetabular reamer drive shaft.

21. The acetabular reamer as set forth in claim 1

Assignees

• Howmedica Osteonics Corp

Inventors

• Roger Christopher Abee

Classifications

• A61B17/1746 Primary

  for the acetabulum · CPC title

• A61B2017/0042

  with special provisions for gripping · CPC title

• A61B17/1617

  with mobile or detachable parts · CPC title

• A61B17/56

  Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor · CPC title

• A61B17/1666

  for the acetabulum · CPC title