US5108402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for removing pre-placed prosthetic joints and preparing for their placement
Assignee: Covidien AG
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Filing: 1990-01-19
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Granted: 1992-04-28
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Expires: 2010-01-19
Abstract
Abstract A method and apparatus for removing a pre-placed prosthetic joint from a bone cavity and conditioning the cavity for receipt of a replacement joint. The pre-placed joint is first pulled from the mantle of hardened cement holding it within the cavity, thus leaving a cavity within the mantle. A mass of fluid cement is then placed within the cement cavity, after which a pulling tool is inserted into the fluid cement and the fluid cement is permitted to cure to bond with the hardened cement and form an integral mass. The pulling tool has helical screw thread on it, with means to connect a slap-hammer to its proximal end, so that its insertion into the fluid cement defines a threaded passageway. The pulling tool is then partly removed from the passageway by unscrewing it. Tension is then applied to the pulling tool to remove the tool and the cement mantle surrounding it from the bone cavity. The tool is then reinserted and the process is repeated as many times as desired until all of the cement mantle is removed. Alternatively, multi-piece tools may be used so that when the tool is partly removed from the mantle, a portion of the tool remains behind for later use, thus saving the step of reinserting the tool.
Inventors
- 👤 Albert K. Chin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:57
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/16; A61B17/1613; A61B17/1628; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/46; A61F2/4603; A61F2/4607; A61B90/00; A61B90/06; A61B2090/062; A61B50/00; A61B50/30; A61B50/33; A61F2002/4625; A61F2002/4628; A61F2002/4681; Y; Y10; Y10S; Y10S623/00; Y10S623/92; Y10S623/923
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
212 words
A method for removing a prosthetic appliance secured in place by a mantle of hardened methylmethacrylate cement received within a bone cavity and conditioning the bone cavity for receipt of a new appliance, comprising: (a) pulling the appliance from the mantle of hardened cement to leave a first cement cavity within the mantle said cavity having top and bottom regions; (b) injecting a fluid mass of methylmethacrylate cement into the first cement cavity; (c) creating a second cavity in the fluid mass of methylmethacrylate cement; (d) permitting said fluid mass of methylmethacrylate cement to harden around said second cavity and bond to the hardened mantle; (e) engaging less than the full length of the second cavity with a pulling tool having an exterior surface adapted to complementally mate with the interior surface of said second cavity; (f) applying tension to the pulling tool to pull the tool and the surrounding portion of the mantle of methylmethacrylate cement from the bone cavity while leaving a remaining portion of the mantle in the cavity; (g) inserting a pulling tool into the remaining portion of the mantle of methylmethacrylate; and (h) applying tension to the pulling tool to pull the tool and the surrounding portion of the mantle of methylmethacrylate cement from the bone cavity.
Claim 2
Independent Claim
212 words
A method for removing a prosthetic appliance secured in place by a mantle of hardened methylmethacrylate cement received within a bone cavity and conditioning the bone cavity for receipt of a new appliance, comprising: (a) pulling the appliance from the mantle of hardened cement to leave a first cement cavity within the mantle said cavity having top and bottom regions; (b) injecting a fluid mass of methylmethacrylate cement into the first cement cavity; (c) creating a second cavity in the fluid mass of methylmethacrylate cement; (d) permitting said fluid mass of methylmethacrylate cement to harden around said second cavity and bond to the hardened mantle; (e) engaging less than the full length of the second cavity with a pulling tool having an exterior surface adapted to complementally mate with the interior surface of said second cavity; (f) applying tension to the pulling tool to pull the tool and the surrounding portion of the mantle of methylmethacrylate cement from the bone cavity while leaving a remaining portion of the mantle in the cavity; (g) inserting a pulling tool into the remaining portion of the mantle of methylmethacrylate; and (h) applying tension to the pulling tool to pull the tool and the surrounding portion of the mantle of methylmethacrylate cement from the bone cavity.
Claim 3
Dependent Claim
56 words
A method according to claim 1 wherein the step of creating a second cavity in the fluid mass of methylmethacrylate cement further comprises: inserting a post having an exterior surface with grip forming elements into the fluid mass of methylmethacrylate cement; withdrawing the post from the hardened mass of methylmethacrylate cement to leave a cavity therein.
Claim 4
Dependent Claim
21 words
A method according to claim 2 wherein the pulling tool has an exterior surface of the same configuration as the post.
Claim 5
Dependent Claim
26 words
A method according to claim 1 further comprising abrading and cleaning the cement cavity prior to injecting the fluid mass of methylmethacrylate cement into said cavity.
Claim 6
Dependent Claim
38 words
A method according to claim 1 further comprising the step of drilling an extension in the hardened mantle at the bottom region of the cement cavity prior to injecting the mass of fluid cement into the cement cavity.
Claim 7
Dependent Claim
94 words
A method according to claim 1 wherein the step of injecting the fluid mass of cement into the cement cavity comprises: extending a nozzle to the bottom region of the cement cavity; forcing fluid cement into the bottom region of the cement cavity through the nozzle from the top region of the cement cavity until the cavity is substantially full of said fluid cement; and, withdrawing the nozzle from the cement cavity while continuing to force fluid cement through the nozzle to fill the cement cavity with a void free mass of fluid cement.
Claim 8
Dependent Claim
47 words
A method according to claim 2 wherein: the post is cylindrical and the grip forming elements thereof comprise helical threads; and, the post is withdrawn from the mass of fluid cement by turning the post about its longitudinal axis to unscrew the threads from the hardened cement.
Claim 9
Dependent Claim
45 words
A method according to claim 7 wherein: the post has distal and proximal sections; the distal section is cylindrical and of smaller diameter than the proximal section; the threads are formed on both sections; and, the distal section is inserted into the fluid cement first.
Claim 10
Dependent Claim
19 words
A method according to claim 8 wherein the threads on each section of the post are of equal pitch.
Claim 11
Dependent Claim
21 words
A method according to claim 8 wherein the pulling tool has an exterior surface of the same configuration as the post.
Claim 12
Dependent Claim
21 words
A method according to claim 10 wherein the distal section of the pulling tool may be detached from the proximal section.
Claim 13
Dependent Claim
31 words
A method according to claim 1 wherein tension is applied to the pulling tool by securing a slap-hammer to the post and subjecting the post to impact tension through the slap-hammer.
Claim 14
Dependent Claim
23 words
A method according to claim 12 wherein the post is cylindrical and the impact tension is applied in generally axial alignment relative thereto.
Claim 15
Dependent Claim
58 words
A method according to claim 3 wherein the post and the pulling tool are the same device and the steps of withdrawing the post from the hardened mass of cement and engaging less than the full length of the second cavity are accomplished by the single step of partially removing the post from the mass of hardened cement.
Claim 16
Dependent Claim
58 words
A method according to claim 10 wherein the post and the pulling tool are the same device and the steps of withdrawing the post from the hardened mass of cement and engaging less than the full length of the second cavity are accomplished by the single step of partially removing the post from the mass of hardened cement.
Claim 17
Dependent Claim
71 words
A method according to claim 11 wherein the post and the pulling tool are the same device and the steps of withdrawing the post from the hardened mass of cement and engaging less than the full length of the second cavity are accomplished by the single step of partially removing the post from the mass of hardened cement and leaving the distal section of the pulling tool within the hardened cement.
Claim 18
Independent Claim
183 words
A method for removing a hardened mantle of methylmethacrylate cement adhered to a bone, said method comprising: (a) placing a mass of fluid methylmethacrylate cement in intimate contact with the hardened mantle of cement to at least partially dissolve and soften the hardened mantle; (b) creating a cavity having a full predetermined length within the mass of fluid methylmethacrylate cement; (c) permitting said fluid mass of methylmethacrylate cement to harden around said cavity and bond to the softened mantle; (d) engaging less than the predetermined full length of the cavity with a pulling tool having an exterior surface adapted to complementally mate with an interior surface of said cavity; (e) applying tension to the pulling tool to pull the tool and the surrounding portion of the mantle of methylmethacrylate cement from the bone while leaving a remaining portion of the mantle in the cavity; (f) inserting a pulling tool into the remaining portion of the mantle of methylmethacrylate; and (g) applying tension to the pulling tool to pull the tool and the surrounding portion of the mantle of methylmethacrylate cement from the bone.
Claim 19
Independent Claim
183 words
A method for removing a hardened mantle of methylmethacrylate cement adhered to a bone, said method comprising: (a) placing a mass of fluid methylmethacrylate cement in intimate contact with the hardened mantle of cement to at least partially dissolve and soften the hardened mantle; (b) creating a cavity having a full predetermined length within the mass of fluid methylmethacrylate cement; (c) permitting said fluid mass of methylmethacrylate cement to harden around said cavity and bond to the softened mantle; (d) engaging less than the predetermined full length of the cavity with a pulling tool having an exterior surface adapted to complementally mate with an interior surface of said cavity; (e) applying tension to the pulling tool to pull the tool and the surrounding portion of the mantle of methylmethacrylate cement from the bone while leaving a remaining portion of the mantle in the cavity; (f) inserting a pulling tool into the remaining portion of the mantle of methylmethacrylate; and (g) applying tension to the pulling tool to pull the tool and the surrounding portion of the mantle of methylmethacrylate cement from the bone.
Claim 20
Dependent Claim
60 words
A method according to claim 17, wherein: a cavity is formed in the hardened mantle prior to placing the fluid mass of cement; the fluid mass of cement is placed within the cavity formed in the mantle; and, the pulling tool is imbedded in the fluid mass of cement so as to extend into the cavity formed in the mantle.
Claim 21
Independent Claim
213 words
A method for removing a pre-placed prosthetic joint secured in place within a bone cavity in an end portion of a bone by a mantle of hardened cement and conditioning the bone cavity for receipt of a new joint, said method comprising: (a) pulling the pre-placed joint from the mantle of hardened cement to leave a cement cavity within the mantle; (b) injecting a mass of fluid cement into the cement cavity; (c) creating a second cavity having a full predetermined length in the mass of fluid cement; (d) permitting said mass of fluid cement to harden around said second cavity and bond to the hardened mantle; (e) engaging less than the full predetermined length of the second cavity with a pulling tool having an exterior surface adapted to complementally mate with the interior surface of said second cavity; (f) applying tension to the pulling tool to pull the tool and the surrounding portion of the mantle of cement from the bone cavity while leaving a remaining portion of the mantle in the cavity; (g) inserting a pulling tool into the remaining portion of the mantle of cement; and (h) applying tension to the pulling tool to pull the tool and the surrounding portion of the mantle of cement from the bone cavity.
Claim 22
Independent Claim
213 words
A method for removing a pre-placed prosthetic joint secured in place within a bone cavity in an end portion of a bone by a mantle of hardened cement and conditioning the bone cavity for receipt of a new joint, said method comprising: (a) pulling the pre-placed joint from the mantle of hardened cement to leave a cement cavity within the mantle; (b) injecting a mass of fluid cement into the cement cavity; (c) creating a second cavity having a full predetermined length in the mass of fluid cement; (d) permitting said mass of fluid cement to harden around said second cavity and bond to the hardened mantle; (e) engaging less than the full predetermined length of the second cavity with a pulling tool having an exterior surface adapted to complementally mate with the interior surface of said second cavity; (f) applying tension to the pulling tool to pull the tool and the surrounding portion of the mantle of cement from the bone cavity while leaving a remaining portion of the mantle in the cavity; (g) inserting a pulling tool into the remaining portion of the mantle of cement; and (h) applying tension to the pulling tool to pull the tool and the surrounding portion of the mantle of cement from the bone cavity.
Claim 23
Dependent Claim
55 words
The method according to claim 19, wherein the joint is a hip joint secured in place in an end portion of a femur adjacent to a trochanter region further comprising cutting the trochanter off of the femur to expose the hardened mantle within the bone cavity prior to pulling the pre-placed joint from the mantle.
Claim 24
Dependent Claim
25 words
A method according to claim 19 further comprising abrading and cleaning the cement cavity prior to injecting the mass of fluid cement into said cavity.
Claim 25
Dependent Claim
37 words
A method according to claim 19 further comprising the step of drilling an extension in the hardened mantle at the bottom of the cement cavity prior to injecting the mass of fluid cement into the cement cavity.
Claim 26
Dependent Claim
56 words
A method according to claim 19 wherein the step of creating a second cavity in the fluid mass of methylmethacrylate cement further comprises: inserting a post having an exterior surface with grip forming elements into the fluid mass of methylmethacrylate cement; withdrawing the post from the hardened mass of methylmethacrylate cement to leave a cavity therein.
Claim 27
Dependent Claim
23 words
A method according to claim 23 wherein, the pulling tool has an exterior surface of a configuration corresponding to that of the post.
Claim 28
Dependent Claim
91 words
A method according to claim 19 wherein the step of injecting the fluid mass of cement into the cement cavity comprises: extending a nozzle to the bottom of the cement cavity; forcing fluid cement into the bottom of the cement cavity through the nozzle from the top of the cement cavity until the cavity is substantially full of said fluid cement; and, withdrawing the nozzle from the cement cavity while continuing to force fluid cement through the nozzle to fill the cement cavity with a void free mass of fluid cement.
Claim 29
Dependent Claim
48 words
A method according to claim 23 wherein: the post is generally cylindrical and the grip forming elements thereof comprise helical threads; and, the post is withdrawn from the mass of fluid cement by turning the post about its longitudinal axis to unscrew the threads from the hardened cement.
Claim 30
Dependent Claim
45 words
A method according to claim 26 wherein: the post has distal and proximal sections; the distal section is cylindrical and of smaller diameter than the proximal section; the threads are formed on both sections; and, the distal section is inserted into the fluid cement first.
Claim 31
Dependent Claim
19 words
A method according to claim 27 wherein the threads on each section of the post are of equal pitch.
Claim 32
Dependent Claim
21 words
A method according to claim 28 wherein the pulling tool has an exterior surface of the same configuration as the post.
Claim 33
Dependent Claim
21 words
A method according to claim 29 wherein the distal section of the pulling tool may be detached from the proximal section.
Claim 34
Dependent Claim
31 words
A method according to claim 19 wherein tension is applied to the pulling tool by securing a slap-hammer to the post and subjecting the post to impact tension through the slap-hammer.
Claim 35
Dependent Claim
23 words
A method according to claim 31 wherein the post is cylindrical and the impact tension is applied in generally axial alignment relative thereto.
Claim 36
Dependent Claim
58 words
A method according to claim 24 wherein the post and the pulling tool are the same device and the steps of withdrawing the post from the hardened mass of cement and engaging less than the full length of the second cavity are accomplished by the single step of partially removing the post from the mass of hardened cement.
Claim 37
Dependent Claim
58 words
A method according to claim 29 wherein the post and the pulling tool are the same device and the steps of withdrawing the post from the hardened mass of cement and engaging less than the full length of the second cavity are accomplished by the single step of partially removing the post from the mass of hardened cement.
Claim 38
Dependent Claim
71 words
A method according to claim 30 wherein the post and the pulling tool are the same device and the steps of withdrawing the post from the hardened mass of cement and engaging less than the full length of the second cavity are accomplished by the single step of partially removing the post from the mass of hardened cement and leaving the distal end of the pulling tool within the hardened cement.
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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) | 1995-04-28 | 1995-10-28 | 1996-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-28 | 1999-10-28 | 2000-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-28 | 2003-10-28 | 2004-04-28 | $7700.00 | Window Closed / Lapsed |