Patent US5507830A successfully refreshed from Google Patents.
US5507830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modular hip prosthesis
Assignee: Smith and Nephew Inc
•
Filing: 1993-09-28
•
Granted: 1996-04-16
•
Expires: 2013-09-28
Abstract
Abstract A modular hip prosthesis can be custom fitted to a particular patient by a surgeon prior to surgical insertion. The prosthesis features a body having a neck portion for carrying a rounded head element, a transitional mid-section of the prosthesis body includes generally rectangular and generally rounded cross-sectional areas, and a stem section has a generally rounded cross-sectional area. The stem is tapered to receive a tubular extension sleeve with a hollowed portion corresponding in shape to the stem portion of the prosthesis. The tubular extension sleeve has an open end portion receptive of the lower tapering stem of the prosthesis body. The stem portion includes an internal bore, and an attachment in the form of an elongated screw is provided for connection to the stem internal bore for securing the extension sleeve and the prosthesis body together, forming a compressive sealed connection therebetween. Pads can be attached to the transitional mid-section of the prosthesis body for increasing the cross-sectional shape of the prosthesis at the transitional mid-section. The pads are loaded continuously to connect to the prosthesis body by the hip joint reaction force. Removable collars can be added to the prosthesis to form a transverse load carrying interface with the upper end of the patient's femur. Frustroconically-shaped extension sleeves can be added to the prosthesis neck for extending the neck length.
Inventors
- 👤 Michael Demane
- 👤 Thomas W. Fallin
- 👤 Steve Garner
- 👤 Jeff Schryver
- 👤 Robert Brosnahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:16
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30721; A61F2/30728; A61F2/30724; A61F2/30734; A61F2/32; A61F2/36; A61F2/3662; A61F2/367; A61F2/3672; A61F2/3676; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30113; A61F2002/30116; A61F2002/30131; A61F2002/30159; A61F2002/30171; A61F2002/30182; A61F2002/30187; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30332; A61F2002/30354; A61F2002/30433; A61F2002/30474; A61F2002/30476; A61F2002/30492; A61F2002/30535; A61F2002/30594; A61F2002/30604; A61F2002/30616; A61F2002/30729; A61F2002/30738; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/30774; A61F2002/30795; A61F2002/30797; A61F2/30907; A61F2002/30919; A61F2/3609; A61F2002/3625; A61F2002/365; A61F2002/3678; A61F2002/3686; A61F2002/3694; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2220/0041; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0013; A61F2230/0028; A61F2230/0034; A61F2230/005
Claims Analysis
Total Claims: 45
Claim 1
Independent Claim
240 words
A modular hip prosthesis that can be custom fitted to a particular patient by a surgeon prior to surgical insertion, comprising: a) a hip prosthesis body having an upper, proximal end portion that provides a neck adapted for carrying a rounded head portion that fits the patient's acetabulum, a thickened mid-section with anterior and posterior sides and a lower generally cylindrically-shaped distal stem portion having upper and lower ends, said prosthesis body being adapted for placement in the intramedullary canal of the patient's femur; b) a plurality of removable distal extension sleeve members at least a portion of each of said sleeve member having a hollow bore configured for receipt and attachment, respectively to the cylindrically-shaped distal stem portion for selectively conforming the prosthesis to the adjacent femoral bone tissue, each of said distal sleeve members having a closed end portion that extends beyond the lower end of the distal stem portion; c) holding means for attaching a selected one of the sleeve members to the prosthesis body, the holding means including complimentary frustroconical surfaces on the upper end of each extension member and an annular surface on the prosthesis body; d) wherein the annular surface is closely positioned adjacent the thickened mid section; and e) the cylindrically-shaped distal stem portion and the distal sleeves being so configured that the hip prosthesis can be selectively used without a said distal sleeve if there is a proper fit without said sleeve.
Claim 2
Dependent Claim
240 words
A modular hip prosthesis that can be custom fitted to a particular patient by a surgeon prior to surgical insertion, comprising: a) a hip prosthesis body having an upper, proximal end portion that provides a neck adapted for carrying a rounded head portion that fits the patient's acetabulum, a thickened mid-section with anterior and posterior sides and a lower generally cylindrically-shaped distal stem portion having upper and lower ends, said prosthesis body being adapted for placement in the intramedullary canal of the patient's femur; b) a plurality of removable distal extension sleeve members at least a portion of each of said sleeve member having a hollow bore configured for receipt and attachment, respectively to the cylindrically-shaped distal stem portion for selectively conforming the prosthesis to the adjacent femoral bone tissue, each of said distal sleeve members having a closed end portion that extends beyond the lower end of the distal stem portion; c) holding means for attaching a selected one of the sleeve members to the prosthesis body, the holding means including complimentary frustroconical surfaces on the upper end of each extension member and an annular surface on the prosthesis body; d) wherein the annular surface is closely positioned adjacent the thickened mid section; and e) the cylindrically-shaped distal stem portion and the distal sleeves being so configured that the hip prosthesis can be selectively used without a said distal sleeve if there is a proper fit without said sleeve.
Claim 3
Dependent Claim
27 words
The modular hip prosthesis of claim 1 wherein the distal stem extension member has a bore of a generally uniform cross-section along a majority of its length.
Claim 4
Dependent Claim
16 words
The modular hip prosthesis of claim 1 wherein the distal stem extension member is substantially straight.
Claim 5
Dependent Claim
24 words
The modular hip prosthesis of claim 1 wherein the distal stem extension member is curved to conform to the shape of the intramedullary canal.
Claim 6
Dependent Claim
19 words
The modular hip prosthesis of claim 1 wherein there are a plurality of proximal extension members of differing lengths.
Claim 7
Dependent Claim
19 words
The modular hip prosthesis of claim 1 wherein there are a plurality of distal extension members of differing lengths.
Claim 8
Dependent Claim
37 words
The modular hip prosthesis of claim 5 wherein at least one of the proximal extension members is a frustroconical tubular member having a smaller diameter end portion with a transversely extending annular portion at the end portion.
Claim 9
Dependent Claim
25 words
The modular hip prosthesis of claim 1 wherein the distal extension member has an upper end with a frustroconically-shaped annular surface communicating with the bore.
Claim 10
Dependent Claim
51 words
The modular hip prosthesis of claim 5 wherein the prosthesis neck terminates at an upper end with a transverse flat surface at least some of the proximal extension members are of a length that places a portion of the proximal extension member beyond the upper end of the neck during use.
Claim 11
Dependent Claim
186 words
A modular hip prosthesis that can be custom fitted to a particular patient by a surgeon prior to surgical insertion, comprising: a) a hip prosthesis body having a proximal end portion with a neck portion for carrying a rounded head portion that fits the patient's acetabulum, a thickened mid-portion, and a cylindrically-shaped elongated distal stem portion having a lower end, said body being adapted for placement in the intramedullary canal of the patient's femur; b) a tubular stem extension sleeve having a hollowed portion generally complimentary in shape to the cylindrical distal stem and including a bore receptive of the stem said sleeve substantially covering said distal stem portion and including a closed lower end portion that extends below the lower end of the distal stem portion; c) attachment means for securing the extension sleeve and prosthesis body together at a position adjacent the mid-portion; and d) the attachment means comprising a frustroconically-shaped portion of the distal end portion that forms a friction fit with the top of the sleeve when the sleeve is loaded axially to the stem and the stem substantially occupies the bore.
Claim 12
Dependent Claim
186 words
A modular hip prosthesis that can be custom fitted to a particular patient by a surgeon prior to surgical insertion, comprising: a) a hip prosthesis body having a proximal end portion with a neck portion for carrying a rounded head portion that fits the patient's acetabulum, a thickened mid-portion, and a cylindrically-shaped elongated distal stem portion having a lower end, said body being adapted for placement in the intramedullary canal of the patient's femur; b) a tubular stem extension sleeve having a hollowed portion generally complimentary in shape to the cylindrical distal stem and including a bore receptive of the stem said sleeve substantially covering said distal stem portion and including a closed lower end portion that extends below the lower end of the distal stem portion; c) attachment means for securing the extension sleeve and prosthesis body together at a position adjacent the mid-portion; and d) the attachment means comprising a frustroconically-shaped portion of the distal end portion that forms a friction fit with the top of the sleeve when the sleeve is loaded axially to the stem and the stem substantially occupies the bore.
Claim 13
Dependent Claim
26 words
The modular hip prosthesis of claim 10 wherein the distal stem extension has a bore of a generally uniform cross-section along a majority of its length.
Claim 14
Dependent Claim
16 words
The modular hip prosthesis of claim 10 wherein the distal stem extension member is substantially straight.
Claim 15
Dependent Claim
24 words
The modular hip prosthesis of claim 10 wherein the distal stem extension member is curved to conform to the shape of the intramedullary canal.
Claim 16
Dependent Claim
26 words
The modular hip prosthesis of claim 10 wherein the extension member has a longitudinally extending portion that increases flexibility of one portion of the extension member.
Claim 17
Dependent Claim
24 words
The modular hip prosthesis of claim 10 further comprising means for increasing the flexibility of one portion of the extension member along its length.
Claim 18
Dependent Claim
20 words
The modular hip prosthesis of claim 10 wherein the extension member has externally projecting means for engaging surrounding bone tissue.
Claim 19
Dependent Claim
26 words
The modular hip prosthesis of claim 15 wherein the flexibility increasing means comprises a longitudinally extending slot that extends along a portion of the extension member.
Claim 20
Dependent Claim
31 words
The modular hip prosthesis of claim 15 wherein the flexibility increasing means comprises a pair of intersecting slots, each extending longitudinally along a portion of the length of the extension member.
Claim 21
Dependent Claim
22 words
The modular hip prosthesis of claim 16 wherein the externally projecting means comprises a plurality of longitudinally extending and circumferentially spaced projections.
Claim 22
Dependent Claim
25 words
The modular hip prosthesis of claim 16 wherein the externally projecting means comprises a plurality of closely spaced longitudinally extending ridges of generally uniform size.
Claim 23
Dependent Claim
192 words
A modular hip prosthesis that can be custom fitted to a particular patient by a surgeon prior to surgical insertion, comprising: a) a hip prosthesis body having an upper end portion with a neck adapted for carrying a removable rounded head portion that fits the patient's acetabulum, a mid-section with anterior and posterior sides and a lower stem portion adapted for placement in the intramedullary canal of the patient's femur; b) removable proximal extension members of differing lengths, each selectively attachable to the neck for selectively conforming the prosthesis to the patient's adjacent acetabulum bone tissue by selectively increasing the length of the prosthesis neck to selectively space a rounded prosthesis head portion away from the mid portion along a line that intersects the patient's acetabular socket; c) each extension member having holding means for attachment to the prosthesis body, the holding means including corresponding frustroconical surfaces on extension member and on the prosthesis body; d) a rounded head prosthetic portion having a frustroconically shaped socket; and e) the extension members each having a frustroconical exterior surface that can form a tight fit with the external surface of a selected extension member.
Claim 24
Dependent Claim
192 words
A modular hip prosthesis that can be custom fitted to a particular patient by a surgeon prior to surgical insertion, comprising: a) a hip prosthesis body having an upper end portion with a neck adapted for carrying a removable rounded head portion that fits the patient's acetabulum, a mid-section with anterior and posterior sides and a lower stem portion adapted for placement in the intramedullary canal of the patient's femur; b) removable proximal extension members of differing lengths, each selectively attachable to the neck for selectively conforming the prosthesis to the patient's adjacent acetabulum bone tissue by selectively increasing the length of the prosthesis neck to selectively space a rounded prosthesis head portion away from the mid portion along a line that intersects the patient's acetabular socket; c) each extension member having holding means for attachment to the prosthesis body, the holding means including corresponding frustroconical surfaces on extension member and on the prosthesis body; d) a rounded head prosthetic portion having a frustroconically shaped socket; and e) the extension members each having a frustroconical exterior surface that can form a tight fit with the external surface of a selected extension member.
Claim 25
Dependent Claim
19 words
The modular hip prosthesis of claim 21 wherein the extension member has a transverse portion at one end portion.
Claim 26
Dependent Claim
17 words
The modular hip prosthesis of claim 21 wherein the extension member has inner and outer frustroconical surfaces.
Claim 27
Dependent Claim
25 words
The modular hip prosthesis of claim 21 wherein at least some of the extension members have a transversely extending annular projecting portion at one end.
Claim 28
Dependent Claim
31 words
The modular hip prosthesis of claim 21 wherein there are a plurality of proximal extension members of differing lengths, some having transversely extending annular portions and some having open end portions.
Claim 29
Dependent Claim
26 words
The modular hip prosthesis of claim 21 wherein each of the plurality of extension members is sized to fit the neck of a single prosthesis body.
Claim 30
Dependent Claim
37 words
The modular hip prosthesis of claim 22 wherein at least one of the proximal extension members is a frustroconical tubular member having a smaller diameter end portion with a transversely extending annular portion at the end portion.
Claim 31
Dependent Claim
18 words
The modular hip prosthesis of claim 21 wherein the extension member and neck are each metallic in construction.
Claim 32
Dependent Claim
49 words
The modular hip prosthesis of claim 25 wherein the prosthesis neck terminates at an upper end with a transverse flat surface, and at least some of the proximal extension members are of a length that places a portion of the proximal extension member beyond the flat surface during use.
Claim 33
Dependent Claim
229 words
A modular hip prosthesis that can be custom fitted to a particular patient by a surgeon prior to surgical insertion, comprising: a) a hip prosthesis body having a proximal end portion with a neck portion for carrying a rounded head portion that fits the patient's acetabulum, a thickened mid-portion, and a cylindrical distal stem portion having a lower end, said body being adapted for placement in the intramedullary canal of the patient's femur; b) an elongated tubular stem extension sleeve extending substantially the full length of the distal stem portion, said sleeve having a hollowed portion generally complimentary in shape to the cylindrical distal stem and including a bore receptive of the stem, the stem extension having one end portion that is open, defining a socket that communicates with the bore and a second end portion that is closed for extending below the lower end of the distal stem portion; c) attachment means positioned immediately adjacent the lower end of the mid-portion and the top of the distal stem portion for securing the extension sleeve and prosthesis body together; and d) the attachment means comprising a frustroconically-shaped portion on the upper end of the distal stem portion that forms a friction taper-lock fit with the top of the sleeve when the sleeve is loaded axially to the stem and the stem occupies at least a majority of the bore.
Claim 34
Dependent Claim
229 words
A modular hip prosthesis that can be custom fitted to a particular patient by a surgeon prior to surgical insertion, comprising: a) a hip prosthesis body having a proximal end portion with a neck portion for carrying a rounded head portion that fits the patient's acetabulum, a thickened mid-portion, and a cylindrical distal stem portion having a lower end, said body being adapted for placement in the intramedullary canal of the patient's femur; b) an elongated tubular stem extension sleeve extending substantially the full length of the distal stem portion, said sleeve having a hollowed portion generally complimentary in shape to the cylindrical distal stem and including a bore receptive of the stem, the stem extension having one end portion that is open, defining a socket that communicates with the bore and a second end portion that is closed for extending below the lower end of the distal stem portion; c) attachment means positioned immediately adjacent the lower end of the mid-portion and the top of the distal stem portion for securing the extension sleeve and prosthesis body together; and d) the attachment means comprising a frustroconically-shaped portion on the upper end of the distal stem portion that forms a friction taper-lock fit with the top of the sleeve when the sleeve is loaded axially to the stem and the stem occupies at least a majority of the bore.
Claim 35
Dependent Claim
26 words
The modular hip prosthesis of claim 30 wherein the stem extension sleeve has a bore of a generally uniform cross-section along a majority of its length.
Claim 36
Dependent Claim
15 words
The modular hip prosthesis of claim 30 wherein the stem extension sleeve is substantially straight.
Claim 37
Dependent Claim
24 words
The modular hip prosthesis of claim 30 wherein the stem extension sleeve is curved to conform to the shape of the patient's intramedullary canal.
Claim 38
Dependent Claim
21 words
The modular hip prosthesis of claim 30 further comprising a slot that extends longitudinally along the length of the extension sleeve.
Claim 39
Dependent Claim
38 words
The modular hip prosthesis of claim 30 wherein the extension sleeve member further comprises externally projecting, longitudinally extending means for engaging surrounding bone tissue to prevent rotation of the stem and sleeve relative to the patient's bone tissue.
Claim 40
Dependent Claim
30 words
The modular hip prosthesis of claim 34 wherein there are a pair of intersecting, longitudinally extending slots that extends along a major portion of the length of each extension member.
Claim 41
Dependent Claim
28 words
The modular hip prosthesis of claim 34 wherein there are a pair of intersecting slots extending longitudinally along a portion of the length of the extension sleeve member.
Claim 42
Dependent Claim
31 words
The modular hip prosthesis of claim 35 wherein the externally projecting means comprises a plurality of longitudinally extending and circumferentially spaced projections on the outer surface of the extension sleeve member.
Claim 43
Dependent Claim
25 words
The modular hip prosthesis of claim 35 wherein the externally projecting means comprises a plurality of closely spaced longitudinally extending ridges of generally uniform size.
Claim 44
Dependent Claim
248 words
A modular hip prosthesis that can be custom fitted to a particular patient by a surgeon prior to surgical insertion, comprising: a) a hip prosthesis body having a proximal end portion with a neck portion for carrying a rounded head portion that fits the patient's acetabulum, a transversely thickened mid-portion, and a cylindrical distal stem portion, said body being adapted for placement in the intramedullary canal of the patient's femur, the stem including a lower distal end portion that is hemispherically shaped; b) a tubular stem extension sleeve extending substantially the full length of the distal stem portion, said sleeve having a hollowed portion generally complimentary in shape to the stem and including a bore receptive of the stem, the stem extension having one end portion that is open so that the stem can enter the bore at the opening and a second end portion that is closed, said second end portion comprising a hemispherically shaped lower distal end portion that extends below the lower end of the distal stem portion; c) attachment means on the top of the distal stem positioned closely for securing the extension sleeve and prosthesis body together; and d) the attachment means including a beveled annular portion of the distal stem that forms a friction fit when the sleeve is loaded axially to the stem and the stem occupies the bore, and e) wherein the prosthesis body gradually increases in diameter proximally of the beveled annular portion to define the transversely thickened portion.
Claim 45
Dependent Claim
248 words
A modular hip prosthesis that can be custom fitted to a particular patient by a surgeon prior to surgical insertion, comprising: a) a hip prosthesis body having a proximal end portion with a neck portion for carrying a rounded head portion that fits the patient's acetabulum, a transversely thickened mid-portion, and a cylindrical distal stem portion, said body being adapted for placement in the intramedullary canal of the patient's femur, the stem including a lower distal end portion that is hemispherically shaped; b) a tubular stem extension sleeve extending substantially the full length of the distal stem portion, said sleeve having a hollowed portion generally complimentary in shape to the stem and including a bore receptive of the stem, the stem extension having one end portion that is open so that the stem can enter the bore at the opening and a second end portion that is closed, said second end portion comprising a hemispherically shaped lower distal end portion that extends below the lower end of the distal stem portion; c) attachment means on the top of the distal stem positioned closely for securing the extension sleeve and prosthesis body together; and d) the attachment means including a beveled annular portion of the distal stem that forms a friction fit when the sleeve is loaded axially to the stem and the stem occupies the bore, and e) wherein the prosthesis body gradually increases in diameter proximally of the beveled annular portion to define the transversely thickened portion.
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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) | 1999-04-16 | 1999-10-16 | 2000-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-16 | 2003-10-16 | 2004-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-16 | 2007-10-16 | 2008-04-16 | $7700.00 | Window Closed / Lapsed |