Patent US5702460A successfully refreshed from Google Patents.
US5702460A
Expired / Lapsed
US
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Revision femoral trial prosthesis
Assignee: Smith and Nephew Inc
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Filing: 1995-08-16
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Granted: 1997-12-30
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Expires: 2015-08-16
Abstract
Abstract A trial femoral prosthesis for use in knee joint replacement surgery includes a trial prosthesis body that is generally J-shaped. The prosthesis body provides a distal articulating surface and a proximal non-articulating surface. The articulating surface includes medial and lateral condylar portions, a distal portion, and an anterior portion. An elongated stem extends from the distal non-articulating surface for anchoring the trial prosthesis to the intramedullary canal of the patient's femur. Wedge trial insert members are connectable to the trial prosthesis body at the non-articulating surface. The inserts can be of different shape and different thicknesses and can be independently placed on opposite sides of the stem. However, the prosthesis body can be used independently without any inserts. The apparatus assists a surgeon who is going to revise a total knee that had been previously implanted. If a surgeon needs a wedge insert for the trial, a corresponding wedge is placed on the final knee implant. The trial prosthesis body and wedges each provide cutting edges that remove bone in the exact places in order to make the implant fit snugly. The cutting edges shave bone material when the surgeon drives the trial onto the distal femur. If bone needs to be removed in the distal area to accommodate a wedge insert, cutting guide slots are provided in the trial prosthesis body. If bone needs to be removed in the anterior or posterior chamfer area, angled chamfer cutting guide slots are provided in the trial prosthesis body.
Inventors
- 👤 Thomas A. Carls
- 👤 Tony Melkent
- 👤 Leo A. Whiteside
- 👤 Tim Vendrely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:13
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/46; A61F2/4684; A61B; A61B17/00; A61B17/14; A61B17/15; A61B17/154; A61B17/155; A61B17/16; A61B17/1604; A61B17/17; A61B17/1739; A61B17/1764; A61F2/4603; A61F2/461; A61B17/157; A61B2017/1602; A61B90/00; A61B90/03; A61B2090/033; A61B90/06; A61F2/38; A61F2/3859; A61F2/389; A61F2002/30001; A61F2002/30316; A61F2002/30329; A61F2002/30433; A61F2002/30535; A61F2002/30594; A61F2002/30604; A61F2002/30616; A61F2/30721; A61F2/30734; A61F2002/30736; A61F2002/4681; A61F2220/00; A61F2220/0025; A61F2220/0041; Y; Y10; Y10S; Y10S623/00; Y10S623/912; Y10S623/914
Claims Analysis
Total Claims: 59
Claim 1
Independent Claim
108 words
A trial femoral prosthesis for use in knee joint replacement surgery comprising: a) a trim prosthesis body having an articulating surface and a non-articulating surface, said articulating surface including posterior medial and lateral condylar portions; b) a stem member that extends from the non-articulating surface; c) a trial insert that is connectable to the trial prosthesis body at the non-articulating surface on either the medial or lateral side of the trial prosthesis; and d) the trial prosthesis body having cutting surfaces on the medial and lateral condylar portions for cutting the patient's distal femur during a simultaneous placement of the trial prosthesis body on the patient's distal femur.
Claim 2
Dependent Claim
108 words
A trial femoral prosthesis for use in knee joint replacement surgery comprising: a) a trim prosthesis body having an articulating surface and a non-articulating surface, said articulating surface including posterior medial and lateral condylar portions; b) a stem member that extends from the non-articulating surface; c) a trial insert that is connectable to the trial prosthesis body at the non-articulating surface on either the medial or lateral side of the trial prosthesis; and d) the trial prosthesis body having cutting surfaces on the medial and lateral condylar portions for cutting the patient's distal femur during a simultaneous placement of the trial prosthesis body on the patient's distal femur.
Claim 3
Dependent Claim
15 words
The trial prosthesis of claim 1 wherein the non-articulating surface includes multiple intersecting flat surfaces.
Claim 4
Dependent Claim
45 words
The trial prosthesis of claim 2 wherein one of the flat surfaces is an anterior chamfer non-articulating surface and the prosthesis body has a thickened portion on the anterior chamfer non-articulating surface that extends from a position adjacent the stem toward the anterior non-articulating surface.
Claim 5
Dependent Claim
22 words
The trial prosthesis of claim 2 wherein there are five non-articulating surfaces including distal, anterior, posterior, anterior chamfer and posterior chamfer surface.
Claim 6
Dependent Claim
34 words
The trial prosthesis of claim 4 further comprising a plurality of cutting guide slots that extend a partial distance through the trial body, each slot communicating with the articulating surface and a non-articulating surface.
Claim 7
Dependent Claim
21 words
The trial prosthesis of claim 5 wherein one of the cutting guide slots is parallel to the anterior chamfer non-articulating surface.
Claim 8
Dependent Claim
29 words
The trial prosthesis of claim 6 wherein there are two spaced apart cutting guide slots including medial and lateral slots that are coplanar with the anterior chamfer non-articulating surface.
Claim 9
Dependent Claim
21 words
The trial prosthesis of claim 7 wherein a plurality of the cutting guide slots are parallel to the distal non-articulating surface.
Claim 10
Dependent Claim
21 words
The trial prosthesis of claim 8 wherein there are two parallel cutting guide slots, each parallel to the distal non-articulating surface.
Claim 11
Dependent Claim
41 words
The trial prosthesis of claim 9 wherein there are a plurality of cutting guide slots that are parallel to the distal non-articulating surface at least medial and lateral slots, and wherein at least two of said cutting guide slots are parallel.
Claim 12
Dependent Claim
21 words
The trial prosthesis of claim 10 further comprising a cutting guide slot that is generally coplanar with the anterior chamfer surface.
Claim 13
Dependent Claim
22 words
The trial prosthesis of claim 5 wherein at least one of the cutting guide slots is parallel to the distal non-articulating surface.
Claim 14
Dependent Claim
28 words
The trial prosthesis of claim 12 wherein there are two spaced apart cutting guide slots including medial and lateral slots that are parallel to the distal non-articulating surface.
Claim 15
Dependent Claim
54 words
The trial prosthesis of claim 1 wherein the non-articulating surface includes a transversely extending distal non-articulating surface that intersects the patient's femoral intramedullary axis at a generally transverse angle when in use, and further includes a pair of generally parallel anterior and posterior surfaces, and wherein the stem generally tracks the patient's intramedullary axis.
Claim 16
Dependent Claim
29 words
The trial prosthesis of claim 14 wherein the non-articulating surface includes a posterior non-articulating surface and at least some of the cutting surfaces communicate with the posterior non-articulating surface.
Claim 17
Dependent Claim
29 words
The trial prosthesis of claim 14 wherein the non-articulating surface includes an anterior non-articulating surface and at least one of the cutting surfaces communicates with the anterior non-articulating surface.
Claim 18
Dependent Claim
21 words
The trial prosthesis of claim 1 wherein at least some of the cutting surfaces extend along a medial to lateral line.
Claim 19
Dependent Claim
39 words
The trial prosthesis of claim 1 further including anterior chamfer and distal cutting guide slots that each extend generally along a medial to lateral line, wherein the distal cutting guide slots are generally parallel to the distal non-articulating surface.
Claim 20
Dependent Claim
13 words
The trial prosthesis of claim 1 wherein the prosthesis body is generally J-shaped.
Claim 21
Dependent Claim
29 words
The trial prosthesis of claim 1 wherein the prosthesis body and trial insert have corresponding mating surfaces that abut upon assembly of the trial insert to the trial body.
Claim 22
Dependent Claim
34 words
The trial prosthesis of claim 1 further comprising a plurality of cutting guide slots that extend a partial distance through the trial body, each slot communicating with the articulating surface and the non-articulating surface.
Claim 23
Dependent Claim
40 words
The trial prosthesis of claim 21 wherein the cutting guide slots include opposed, spaced apart medial and lateral distal cutting guide slots for guiding a cutting tool for shaving bone tissue from the extreme distal surface of the patient's femur.
Claim 24
Dependent Claim
15 words
The trial prosthesis of claim 21 wherein the cutting guide slots each define a plane.
Claim 25
Dependent Claim
15 words
The trial prosthesis of claim 23 wherein at least two of the planes are parallel.
Claim 26
Dependent Claim
145 words
A trial femoral prosthesis for use in knee joint replacement surgery comprising: a) a trial prosthesis body having an (a distal) articulating surface and a (proximal) non-articulating surface, said articulating surface including medial and lateral condylar portions, said (distal) non-articulating surface including a plurality of flat intersecting surfaces that include distal, anterior chaffer and posterior chamfer surface; b) a wedge trial insert that is connectable to the trial prosthesis body at the (proximal) non-articulating surface and extending toward the anterior and posterior chamfer surfaces; (and) c) a plurality of cutting guide slots that extend through the trial body, each slot communicating with the articulating surface and the non-articulating surface; and d) the trial prosthesis body having cutting surfaces on the medial and lateral condylar portions for cutting the patient's distal femur during a simultaneous placement of the trial prosthesis body on the patient's distal femur.
Claim 27
Dependent Claim
145 words
A trial femoral prosthesis for use in knee joint replacement surgery comprising: a) a trial prosthesis body having an (a distal) articulating surface and a (proximal) non-articulating surface, said articulating surface including medial and lateral condylar portions, said (distal) non-articulating surface including a plurality of flat intersecting surfaces that include distal, anterior chaffer and posterior chamfer surface; b) a wedge trial insert that is connectable to the trial prosthesis body at the (proximal) non-articulating surface and extending toward the anterior and posterior chamfer surfaces; (and) c) a plurality of cutting guide slots that extend through the trial body, each slot communicating with the articulating surface and the non-articulating surface; and d) the trial prosthesis body having cutting surfaces on the medial and lateral condylar portions for cutting the patient's distal femur during a simultaneous placement of the trial prosthesis body on the patient's distal femur.
Claim 28
Dependent Claim
26 words
The trial prosthesis of claim 25 wherein the cutting guide slots include at least one chamfer cutting slot that is coplanar with the anterior chamfer surface.
Claim 29
Dependent Claim
27 words
The trial prosthesis of claim 25 wherein the cutting guide slots include at least one distal slot for cutting the distal femur to accommodate the trial wedge.
Claim 30
Dependent Claim
26 words
The trial prosthesis of claim 25 wherein the cutting guide slots include at least one chamfer cutting slot that is coplanar with the posterior chamfer surface.
Claim 31
Dependent Claim
27 words
The trial prosthesis of claim 25 wherein the cutting guide slots include at least one posterior slot for cutting the distal femur to accommodate the trial wedge.
Claim 32
Dependent Claim
21 words
The trial prosthesis of claim 25 wherein the cutting guide slots include a pair of slots that, define generally parallel planes.
Claim 33
Dependent Claim
23 words
The trial prosthesis of claim 25 further comprising connection means for releasably connecting the wedge insert to the trial body prosthesis during surgery.
Claim 34
Dependent Claim
33 words
The trial prosthesis of claim 25 further comprising cutting edge means on the trial prosthesis body for cutting the patient's distal femur during placement of the trial prosthesis body on the distal femur.
Claim 35
Dependent Claim
38 words
The trial prosthesis of claim 25 further comprising cutting edge means on the trial wedge insert for cutting the patient's distal femur during placement of the trial prosthesis body and the wedge connected thereto on the distal femur.
Claim 36
Dependent Claim
40 words
The trial prosthesis of claim 25 further comprising cutting surfaces on both the trial femoral prosthesis body and the trial femoral wedge for cutting the patient's distal femur during surgical placement of the trial prothesis body on the distal femur.
Claim 37
Dependent Claim
30 words
The trial prosthesis of claim 25 wherein the wedge trial and trial body each provide planar non-articulating surfaces that abut upon assembly of a trial wedge to the trial body.
Claim 38
Dependent Claim
34 words
The trial prosthesis of claim 25 wherein the trial wedge has a first flat surface that fits to the prosthesis body and a second flat surface that fits the patient's surgically prepared distal femur.
Claim 39
Dependent Claim
23 words
The trial prosthesis of claim 36 wherein the second flat surface is generally parallel to a non-articulating flat surface on the trial body.
Claim 40
Dependent Claim
190 words
A trial femoral prosthesis for use in knee joint replacement surgery comprising: a) a trial prosthesis body having an (a distal) articulating surface and a (proximal) non-articulating surface, said articulating surface including medial and lateral condylar portions, said (proximal) non-articulating surface including a plurality of flat intersecting surfaces that include distal, anterior chamfer and posterior chamfer surfaces; b) a trial insert that is connectable to the trial prosthesis body at the (proximal) non-articulating surface and extending along a path spanning between the anterior and posterior chamfer surfaces; c) a plurality of cutting guide slots that extend through the trial body generally parallel to the distal surface (along a line that extends along an anterior to posterior line), each slot communicating with the articulating surface and the non-articulating surface; d) each of said cutting guide slots comprised of parallel flat surfaces that each define a plane; and e) the trial prosthesis body having cutting surfaces only on a proximal free end of at least one of the anterior and posterior surfaces for cutting the patient's distal femur during a simultaneous placement of the trial prosthesis body on the patient's distal femur.
Claim 41
Dependent Claim
190 words
A trial femoral prosthesis for use in knee joint replacement surgery comprising: a) a trial prosthesis body having an (a distal) articulating surface and a (proximal) non-articulating surface, said articulating surface including medial and lateral condylar portions, said (proximal) non-articulating surface including a plurality of flat intersecting surfaces that include distal, anterior chamfer and posterior chamfer surfaces; b) a trial insert that is connectable to the trial prosthesis body at the (proximal) non-articulating surface and extending along a path spanning between the anterior and posterior chamfer surfaces; c) a plurality of cutting guide slots that extend through the trial body generally parallel to the distal surface (along a line that extends along an anterior to posterior line), each slot communicating with the articulating surface and the non-articulating surface; d) each of said cutting guide slots comprised of parallel flat surfaces that each define a plane; and e) the trial prosthesis body having cutting surfaces only on a proximal free end of at least one of the anterior and posterior surfaces for cutting the patient's distal femur during a simultaneous placement of the trial prosthesis body on the patient's distal femur.
Claim 42
Dependent Claim
25 words
The trial prosthesis of claim 38 and wherein the geometry, of the trial prosthesis corresponds to the size of an implant selected by the surgeon.
Claim 43
Dependent Claim
17 words
The trial prosthesis of claim 38 wherein there are a plurality of trial inserts of different sizes.
Claim 44
Dependent Claim
17 words
The trial prosthesis of claim 38 wherein there are a plurality, of trial inserts of different shapes.
Claim 45
Dependent Claim
21 words
The trial prosthesis of claim 38 wherein at least one of the slots forms an acute angle with an anterior/posterior line.
Claim 46
Dependent Claim
17 words
The trial prosthesis of claim 38 wherein one of the cutting guide slots is an osteotome track.
Claim 47
Dependent Claim
23 words
The trial prosthesis of claim 38 wherein one of the cutting guide slots is an osteotome track for cutting a posterior chamfer cut.
Claim 48
Dependent Claim
91 words
A trial femoral prosthesis for use in knee joint replacement surgery comprising: a) trial prosthesis body having an articulating surface and a non-articulating surface, said articulating surface including posterior medial and lateral condylar portions, said non-articulating surface including distal, anterior, posterior, anterior chamfer and posterior chamfer surfaces; b) a stem member that extends from the non-articulating surface; and c) the trial prosthesis body having a plurality of cutting guide slots thereon that are generally parallel to the distal non-articulating surface for guiding a cutting tool for cutting the patient's distal femur.
Claim 49
Dependent Claim
91 words
A trial femoral prosthesis for use in knee joint replacement surgery comprising: a) trial prosthesis body having an articulating surface and a non-articulating surface, said articulating surface including posterior medial and lateral condylar portions, said non-articulating surface including distal, anterior, posterior, anterior chamfer and posterior chamfer surfaces; b) a stem member that extends from the non-articulating surface; and c) the trial prosthesis body having a plurality of cutting guide slots thereon that are generally parallel to the distal non-articulating surface for guiding a cutting tool for cutting the patient's distal femur.
Claim 50
Dependent Claim
109 words
A trial femoral prosthesis for use in knee joint replacement surgery comprising: a trial prosthesis body having an articulating surface and a non-articulating surface, said articulating surface including posterior medial and lateral condylar portions, said non-articulating surface including distal, anterior, posterior, anterior chamfer and posterior chamfer surfaces; b) a stem member that extends from the non-articulating surface; c) the trial prosthesis body having a plurality of cutting guide slots thereon that are generally parallel to the distal non-articulating surface for guiding a cutting tool for cutting the patient's distal femur; and d) the cutting guide slots including medial and lateral slots that are parallel to the distal non-articulating surface.
Claim 51
Dependent Claim
109 words
A trial femoral prosthesis for use in knee joint replacement surgery comprising: a trial prosthesis body having an articulating surface and a non-articulating surface, said articulating surface including posterior medial and lateral condylar portions, said non-articulating surface including distal, anterior, posterior, anterior chamfer and posterior chamfer surfaces; b) a stem member that extends from the non-articulating surface; c) the trial prosthesis body having a plurality of cutting guide slots thereon that are generally parallel to the distal non-articulating surface for guiding a cutting tool for cutting the patient's distal femur; and d) the cutting guide slots including medial and lateral slots that are parallel to the distal non-articulating surface.
Claim 52
Dependent Claim
18 words
The trial femoral prosthesis of claim 46 wherein there are two medial and two lateral cutting guide slots.
Claim 53
Dependent Claim
41 words
The trim femoral prosthesis of claim 46 wherein the cutting guide slot, include opposed, spaced apart medial and lateral distal cutting guide slots for guiding a cutting tool for shaving bone tissue from the extreme distal surface of the patient's femur.
Claim 54
Dependent Claim
34 words
The trial prosthesis of claim 46 further comprising a plurality of cutting guide slots that extend a partial distance through the trial body, each slot communicating with the articulating surface and a non-articulating surface.
Claim 55
Dependent Claim
29 words
The trial prosthesis of claim 46 wherein there are two spaced apart cutting guide slots including medial and lateral slots that are coplanar with the anterior chamfer non-articulating surface.
Claim 56
Dependent Claim
24 words
The trial prosthesis of claim 46 wherein the geometry of the trial prosthesis corresponds to the size of an implant selected by the surgeon.
Claim 57
Dependent Claim
24 words
The trial femoral prosthesis of claim 46 further comprising a trial insert that is connectable to the trial prosthesis body at a non-articulating surface.
Claim 58
Dependent Claim
16 words
The trial femoral prosthesis of claim 52 wherein the trial insert engages the distal, non-articulating surface.
Claim 59
Dependent Claim
16 words
The trial femoral prosthesis of claim 53 wherein the trial insert engages the posterior non-articulating surface.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-12-29 | 2001-06-30 | 2001-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-29 | 2005-06-30 | 2005-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-29 | 2009-06-30 | 2009-12-30 | $7700.00 | Window Closed / Lapsed |