Hip stem cement spacer

• US 5,997,581 A
• Filed: 12/29/1997
• Issued: 12/07/1999
• Est. Priority Date: 12/29/1997
• Status: Expired due to Term

• Current Assignee: DePuy Orthopaedics Incorporated (Johnson & Johnson)
• Original Assignee: Johnson & Johnson Professional Company Incorporated (Johnson & Johnson)
• Inventors: Khalili, Farid Bruce
• Primary Examiner(s): Willse, David H.
• Assistant Examiner(s): GHERBI, SUZETTE JAIME J
• Application Number:
  US08/998,882
• Time in Patent Office: 708 Days
• Field of Search: 623/18, 623/23, 411/148, 606/92, 606/93, 606/94
• US Class Current: 623/23.48
• 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 2/36 Femoral heads ; Femoral endoprostheses
• CPC Class Codes: A61F 2/3672 Intermediate parts of shafts
• CPC Class Codes: A61F 2/4657 Measuring instruments used for implanting artificial joints for surgical instruments A61B90/06
• CPC Class Codes: A61F 2002/30113 circular
• CPC Class Codes: A61F 2002/30136 undulated or wavy, e.g. serpentine-shaped or zigzag-shaped
• CPC Class Codes: A61F 2002/302 toroidal, e.g. rings
• CPC Class Codes: A61F 2002/3021 frustoconical
• CPC Class Codes: A61F 2002/30217 hollow cones, e.g. tubular-like cones
• CPC Class Codes: A61F 2002/30235 tubular, e.g. sleeves
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30845 with cutting edges
• CPC Class Codes: A61F 2002/30879 Ribs
• CPC Class Codes: A61F 2002/30896 perpendicular with respect to each other
• CPC Class Codes: A61F 2002/3631 with an integral complete or partial peripheral collar or bearing shoulder at its base
• CPC Class Codes: A61F 2002/4615 of spacers
• CPC Class Codes: A61F 2002/4662 for measuring penetration depth
• CPC Class Codes: A61F 2230/0004 Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2230/0006 circular
• CPC Class Codes: A61F 2230/0065 toroidal, e.g. ring-shaped, doughnut-shaped
• CPC Class Codes: A61F 2230/0067 : conical
• CPC Class Codes: A61F 2230/0069 : cylindrical

Abstract

A spacer includes a body having a first end, a second end, and an aperture open at the first end and at the second end. The spacer can be an element of a prosthetic joint component system that further includes a cement injection nozzle insertable through the aperture in the spacer and a sleeve disposable around at least a portion of the nozzle.

Claims

1. A prosthetic joint component system for use with an elongate prosthetic component having a proximal end region, a distal end region, and a central region between the proximal end region and the distal end region, the prosthetic joint component system comprising:

a body having a first end and a second end, the body defining an aperture open at the first end and at the second end, the aperture having a diameter greater than that of the distal end region and less than that of the proximal end region of the elongate prosthetic component,

wherein the elongate prosthetic component is receivable through the aperture so that the body binds against the elongate prosthetic component in the central region of the elongate prosthetic component,

wherein the aperture defined by the body is generally circular,

wherein the body is symmetric about a center point of the aperture, and

wherein the body is generally toroidal and includes an inner facing wall and an outer facing wall;

a plurality of protuberances extending from the outer facing wall,

wherein the plurality of protuberances are evenly spaced,

wherein the protuberances include sharp edges,

wherein each of the protuberances includes a first end and a second end, and wherein at least one of the first end and second end of each protuberance extends beyond one of the first end and second end of the body, respectively; and

a cement injection nozzle having an open distal end portion insertable through the aperture, the nozzle including measurement indicia.

2. The prosthetic joint component system of claim 1, further comprising a sleeve disposable around at least a portion of the nozzle.

3. The prosthetic joint component system of claim 2, wherein the sleeve is provided with measurement indicia.

4. The prosthetic joint component system of claim 2, wherein the sleeve includes a longitudinal discontinuity and wherein the sleeve is flexible.

5. A prosthetic joint component system for use with an elongate prosthetic component having a proximal end region, a distal end region, and a central region between the proximal end region and the distal end region, the prosthetic joint component system comprising:

a body having a first end and a second end, the body having an inner facing wall defining an aperture open at the first end and at the second end, the aperture having a diameter greater than that of the distal end region and less than that of the proximal end region of the elongate prosthetic component, and an outer facing wall from which a plurality of protuberances extend in a spaced-apart relationship;

a cement injection nozzle insertable through the aperture; and

a sleeve disposable around at least a portion of the nozzle and slidable with respect thereto.

6. A method of using a prosthetic joint component system comprising the steps of:

preparing a bone cavity to receive a prosthetic implant having a proximal end region, a distal end region, and a central region between the proximal end region and the distal end region;

providing a body having a first end and a second end, the body having an inner facing wall defining an aperture open at the first end and at the second end, the aperture having a diameter greater than that of the distal end region and less than that of the proximal end region of the elongate prosthetic component, and an outer facing wall from which a plurality of protuberances extend in a spaced-apart relationship;

inserting the body into a bone cavity;

depositing bone cement into the bone cavity; and

inserting the prosthetic implant through the aperture until the distal end of the prosthetic implant extends distally beyond the body, and the central region of the implant binds against the inner facing wall of the body.

7. A method of using a prosthetic joint component system comprising the steps of:

preparing a bone cavity to receive a prosthetic implant having a proximal end region, a distal end region, and a central region between the proximal end region and the distal end region;

providing a body having a first end and a second end, the body having an inner facing wall defining an aperture open at the first end and at the second end, the aperture having a diameter greater than that of the distal end region and less than that of the proximal end region of the elongate prosthetic component, and an outer facing wall from which a plurality of protuberances extend in a spaced-apart relationship;

inserting the body into a bone cavity;

depositing bone cement into the bone cavity;

inserting the prosthetic implant through the aperture until the distal end of the prosthetic implant extends distally beyond the body, and the central region of the implant binds against the inner facing wall of the body;

providing a nozzle;

providing a sleeve;

surrounding the nozzle with the sleeve;

inserting a portion of the nozzle through the aperture in the body; and

engaging the body with the sleeve.

8. The method of claim 7, further comprising the step of pushing the body toward the distal end of the nozzle.

9. The method of claim 7, further comprising the step of using the sleeve to holding the body at a selected point along the nozzle.