US3889665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for pressurizing gap-filling cement to a concavely relieved site in a bone
Assignee: National Research Development Corp UK
•
Filing: 1973-03-07
•
Granted: 1975-06-17
•
Expires: 1993-03-07
Abstract
Abstract The securement of gap-filling cement to a concavely relieved site in bone is significantly improved, and the risk of mechanical failure correspondingly reduced when the cement is used to secure a prosthetic device in the site, by locating the cement to the site, and pressurizing the cement by forcibly applying an extrusion member to cement in one area within the site while sealing or covering the remaining area of the site to obviate or reduce outward escape of cement. Apparatus for this purpose can comprise an extrusion member having a resilient annular sealing member fixed around one end of the former member, the seal preferably being inflatable by a piston-and-cylinder assembly operated like a syringe at the other end. Another form of apparatus comprises a tapered stem longitudinally movable in sealing relation through a separate Ushaped cover plate.
Inventors
- 👤 Robin Sydney Mackwood Ling
- 👤 Alan John Clive Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:54
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/88; A61B17/8802; A61B17/8805; A61B17/8808; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30721; A61F2/30723; A61F2/46; A61F2/4603; A61F2/4614; A61F2002/30001; A61F2002/30316; A61F2002/30535; A61F2002/30581; A61F2002/4688; A61F2002/4692; A61F2002/4693
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
108 words
Apparatus for pressurizing gap-filling cement applied to a concavely relieved site in a bone, said apparatus comprising a. means for extruding said cement into said bone by longitudinal application thereof to said cement in one area of said site, said means comprising an elongate extrusion member having a solid end portion thereof for forcible application to said cement, and b. an inflatable resilient annular sealing member fixably and sealably connected around said extrusion member adjacent said solid end portion thereof to cover the remaining area of said site around said extrusion member for reducing the outward escape of cement therefrom when pressurized by application of said extrusion member.
Claim 2
Dependent Claim
108 words
Apparatus for pressurizing gap-filling cement applied to a concavely relieved site in a bone, said apparatus comprising a. means for extruding said cement into said bone by longitudinal application thereof to said cement in one area of said site, said means comprising an elongate extrusion member having a solid end portion thereof for forcible application to said cement, and b. an inflatable resilient annular sealing member fixably and sealably connected around said extrusion member adjacent said solid end portion thereof to cover the remaining area of said site around said extrusion member for reducing the outward escape of cement therefrom when pressurized by application of said extrusion member.
Claim 3
Dependent Claim
85 words
Apparatus as recited in claim 1 further comprising a piston and cylinder assembly for inflating said sealing member, said assembly being located on the end of said extrusion member remote from said solid end portion and said assembly being in fluid communication with said sealing member by a passageway extending through said extrusion member, one of said piston and cylinder components being fixably connected with said extrusion member, and the other of said components being coupled with said extrusion member for longitudinal movement relative thereto.
Claim 4
Dependent Claim
59 words
Apparatus as recited in claim 2 wherein said extrusion member and one of said components extends further from said sealing member than said other component, the former being with a palm-engageable handle part, the latter being formed with a finger-engageable handle part, and said assembly being arranged to inflate said sealing member by mutual closing of said handle parts.
Claim 5
Independent Claim
73 words
The method of applying gap-filling cement to a concavely relieved site with a single access opening in a bone, said method comprising the steps of a. applying gap-filling cement to said site through said single access opening, and simultaneously b. pressurizing said cement in said site to extrude cement into cancellous bone material in said site and c. substantially covering the whole of said access opening to prevent outward escape of said cement.
Claim 6
Independent Claim
73 words
The method of applying gap-filling cement to a concavely relieved site with a single access opening in a bone, said method comprising the steps of a. applying gap-filling cement to said site through said single access opening, and simultaneously b. pressurizing said cement in said site to extrude cement into cancellous bone material in said site and c. substantially covering the whole of said access opening to prevent outward escape of said cement.
Claim 7
Dependent Claim
42 words
The method recited in claim 4 wherein said step of preSsurizing said cement in said site is accomplished by introducing a solid-ended instrument through said single access opening therein and applying a longitudinal force thereto to extrude said cement into said bone.
Claim 8
Dependent Claim
50 words
The method as recited in claim 4 wherein said step of substantially covering the whole of said access openings to prevent outward escape of said cement is accomplished by introducing an inflatable sealing element into said site through said single access opening and inflating said sealing element with a fluid.
Claim 9
Independent Claim
91 words
A method of securing a prosthetic device to a bone comprising the steps of: a. preparing a concavely relieved site with a single access opening in the bone exposing thereby cancellous bone material in said site, b. applying gap-filling cement to said site through said single access opening, c. pressurizing said cement in said site to extrude cement into said cancellous bone material in said site, d. substantially covering the whole of said access opening to prevent outward escape of said cement, and e. applying a prosthetic device to said site.
Claim 10
Independent Claim
91 words
A method of securing a prosthetic device to a bone comprising the steps of: a. preparing a concavely relieved site with a single access opening in the bone exposing thereby cancellous bone material in said site, b. applying gap-filling cement to said site through said single access opening, c. pressurizing said cement in said site to extrude cement into said cancellous bone material in said site, d. substantially covering the whole of said access opening to prevent outward escape of said cement, and e. applying a prosthetic device to said site.
Claim 11
Dependent Claim
126 words
Apparatus for pressurising gap-filling cement applied to a concavely relieved site in a bone, said apparatus comprising: a. an elongate extrusion member having a solid head part at one end thereof with a stem part extending therefrom to form a generally mushroom shaping, for extruding said cement into said bone by longitudinal application of said stem part to forcibly apply said head part to said cement in one area of said site, and b. a resilient annular sealing member in the form of the radially outer part of a torous fixably and sealably connected around said stem part behind said head part to cover the remaining area of said site and reduce the outward escape of cement therefrom when pressurised by application of said head part.
Claim 12
Dependent Claim
126 words
Apparatus for pressurising gap-filling cement applied to a concavely relieved site in a bone, said apparatus comprising: a. an elongate extrusion member having a solid head part at one end thereof with a stem part extending therefrom to form a generally mushroom shaping, for extruding said cement into said bone by longitudinal application of said stem part to forcibly apply said head part to said cement in one area of said site, and b. a resilient annular sealing member in the form of the radially outer part of a torous fixably and sealably connected around said stem part behind said head part to cover the remaining area of said site and reduce the outward escape of cement therefrom when pressurised by application of said head part.
Claim 13
Dependent Claim
137 words
Apparatus for pressurising gap-filling cement applied to a concavely relieved site in a bone, said apparatus comprising: a. an elongate extrusion member longitudinally tapered towards a solid end portion for extruding said cement into said bone by longitudinal application of said member to forcibly apply said solid end portion to said cement in one area of said site, and b. means for covering the remaining area of said site around said extrusion member to reduce the outward escape of cement therefrom when pressurised by application of said solid end portion, such means including a U-shaped plate having a correspondingly shaped resilient rim extending in sealing connection circumferentially therearound and radially inwardly from the inner periphery of said plate to receive said extrusion member in wiping engagement therewith during longitudinal movement of said extrusion member through said plate.
Claim 14
Dependent Claim
137 words
Apparatus for pressurising gap-filling cement applied to a concavely relieved site in a bone, said apparatus comprising: a. an elongate extrusion member longitudinally tapered towards a solid end portion for extruding said cement into said bone by longitudinal application of said member to forcibly apply said solid end portion to said cement in one area of said site, and b. means for covering the remaining area of said site around said extrusion member to reduce the outward escape of cement therefrom when pressurised by application of said solid end portion, such means including a U-shaped plate having a correspondingly shaped resilient rim extending in sealing connection circumferentially therearound and radially inwardly from the inner periphery of said plate to receive said extrusion member in wiping engagement therewith during longitudinal movement of said extrusion member through said plate.
Claim 15
Dependent Claim
20 words
Apparatus as recited in claim 9 wherein said extrusion member is an intramedullary stem forming part of a prosthetic device.
References Cited (Backward Citations)
US2313207A
Cited
US3045717A
Cited
US3030951A
Cited
US3239881A
Cited
US3192949A
Cited
US3225760A
Cited
US3435826A
Cited
US3707146A
Cited
US3741204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |