Modular long stem hip trial

• US 6,193,759 B1
• Filed: 01/20/1998
• Issued: 02/27/2001
• Est. Priority Date: 03/26/1997
• Status: Expired due to Term

• Current Assignee: DePuy Orthopaedics Incorporated (Johnson & Johnson)
• Original Assignee: DePuy Orthopaedics Incorporated (Johnson & Johnson)
• Inventors: Dwyer, Kimberly A., Wilson-Wirth, Corey, Ro, Gloria
• Primary Examiner(s): Milano, Michael J.
• Application Number:
  US09/008,866
• Time in Patent Office: 1,134 Days
• Field of Search: 606/86, 606/87, 606/89, 606/90, 606/92, 606/99, 606/100, 606/102, 606/53, 606/63, 606/79, 623/16, 623/18, 623/19, 623/22, 623/23, 623/23.18, 623/23.25, 623/23.28
• US Class Current: 623/23.28
• CPC Class Codes: A61F 2/3609 Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts A61F2/3601 takes precedence
• CPC Class Codes: A61F 2/3662 Femoral shafts
• CPC Class Codes: A61F 2/367 Proximal or metaphyseal parts of shafts trochanteric devices connected to said proximal parts A61F2/30739
• CPC Class Codes: A61F 2/3676 Distal or diaphyseal parts of shafts
• CPC Class Codes: A61F 2/4603 for insertion or extraction of endoprosthetic joints or of accessories thereof
• CPC Class Codes: A61F 2/4607 of hip femoral endoprostheses
• CPC Class Codes: A61F 2/4684 Trial or dummy prostheses
• CPC Class Codes: A61F 2002/30329 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/30354 Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
• CPC Class Codes: A61F 2002/30364 Rotation about the common longitudinal axis
• CPC Class Codes: A61F 2002/30367 with additional means for preventing said rotation
• CPC Class Codes: A61F 2002/30372 with additional means for limiting said translation
• CPC Class Codes: A61F 2002/30373 with additional means for preventing said translation
• CPC Class Codes: A61F 2002/30387 Dovetail connection
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30476 locked by an additional locking mechanism
• CPC Class Codes: A61F 2002/30492 using a locking pin
• CPC Class Codes: A61F 2002/30505 spring biased
• CPC Class Codes: A61F 2002/3055 for adjusting length
• CPC Class Codes: A61F 2002/30616 : Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30708 : Means for distinguishing between left-sided and right-sided devices, Sets comprising both left-sided and right-sided prosthetic parts
• CPC Class Codes: A61F 2002/3071 : Identification means; Administration of patients
• CPC Class Codes: A61F 2002/3627 : with lateral apertures, holes or openings
• CPC Class Codes: A61F 2002/3631 : with an integral complete or partial peripheral collar or bearing shoulder at its base
• CPC Class Codes: A61F 2002/3674 : Connections of proximal parts to distal parts
• CPC Class Codes: A61F 2002/3686 : bent
• CPC Class Codes: A61F 2002/4619 : for extraction
• CPC Class Codes: A61F 2002/4628 : with linear motion along or rotating motion about an axis transverse to the instrument axis or to the implantation direction, e.g. clamping
• CPC Class Codes: A61F 2002/4638 : Tools for performing screwing, e.g. nut or screwdrivers, or particular adaptations therefor
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 : made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2250/0084 : Means for distinguishing between left-sided and right-sided devices; Sets comprising both left-sided and right-sided prosthetic parts
• CPC Class Codes: A61F 2250/0085 : Identification means; Administration of patients

Abstract

A prosthetic trial for a femur includes a curved stem rotatably engaged with a body that defines a trunnion. A locking mechanism inhibits rotation of the body with respect to the stem. The trial is configured for either left or right femoral implantation by rotating the stem with respect to the body to orient the stem in the appropriate direction.

Claims

1. A prosthetic trial for determining the required dimensions of a prosthetic component, comprising:

a stem having a proximal end and a distal end, the proximal end including a reduced diameter portion;

a body including a bore and defining a trunnion, the body being rotatably engaged with the stem, and the bore being dimensioned to receive the reduced diameter portion of the stem; and

a locking mechanism, insertable within the body, that defines a portion of the bore, wherein the locking mechanism is movable from a first position to a second position to increase the diameter of the bore, and wherein the locking mechanism is effective to inhibit movement of the reduced diameter portion of the stem within the bore of the body.

2. The prosthetic trial of claim 1, wherein the trunnion includes a transverse bore therethrough.

3. The prosthetic trial of claim 1, wherein the stem is curved.

4. A prosthetic trial for determining the required dimensions of a prosthetic component, comprising:

a stem having a proximal end and a distal end, the proximal end including a reduced diameter portion;

a body including a bore and defining a trunnion, the body being rotatably engaged with the stem, and the bore being dimensioned to receive the reduced diameter portion of the stem;

a locking mechanism that defines a portion of the bore, wherein the locking mechanism is movable from a first position to a second position to increase the diameter of the bore, and wherein the locking mechanism is effective to inhibit movement of the reduced diameter portion of the stem within the bore of the body; and

a second locking mechanism for retaining the locking mechanism in the first position.

5. The prosthetic trial of claim 4, wherein the second locking mechanism includes an element biased against the locking mechanism and engagable with therewith when the locking mechanism is in the first position.

6. A prosthetic trial comprising:

a body defining a trunnion and a bore;

a stem having a proximal portion and a distal portion, the proximal portion having a diameter that is less than that of the distal portion, the proximal portion being received within the bore of the body; and

a locking mechanism movably engaged with the body, wherein the locking mechanism defines a portion of the bore, and wherein moving the locking mechanism from a first position to a second position changes the diameter of the bore,

wherein the stem is movable longitudinally and rotationally with respect to the body, and

wherein the stem is curved and the rotational orientation of the stem with respect to the body is limited to a first orientation and a second orientation that are 180 degrees apart.

7. The prosthetic trial of claim 6, further comprising complimentary structures that are matable to inhibit rotation of the body with respect to the stem.

8. The prosthetic trial of claim 7, wherein the complimentary structures are mated and unmated by moving the stem longitudinally.

9. The prosthetic trial of claim 8, wherein the complimentary structures include a notch and a tang.