EP0320138A1
Expired / Lapsed
EP
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Sealing device for introducing cement into a bone canal
Assignee: Individual
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Filing: 1988-11-21
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Granted: —
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Expires: 2008-11-21
Abstract
Abstract A proximal femoral sealing device 10 is disclosed for use in the application of bone cement under pressure to a surgically prepared medullary canal 15 of a femur prior to the implantation of a hip prosthesis. The proximal femoral sealing device 10 is formed of a generally solid body member 12 with a passageway 26 and a flexible annular wall member 14 extending from the body member 12. The sealing device 10 has an anatomically shaped outer surface 13, corresponding to the exposed endosteal surface 11 of a prepared medullary canal 15. A chamber 16 defined by a flexible annular wall 14 and the body member 12 opens into the medullary canal 15. In turn, the passageway 26 communicates with the chamber 16 and permits insertion of a cement nozzle 27 therethrough into the chamber. In operation, the proximal femoral sealing device 10 is placed within the proximal end of a surgically prepared medullary canal 15. The canal 15 and chamber 16 of the sealing device are filled with cement resulting in the expansion of the flexible annular wall member 14 against the exposed endosteal walls 11 of the medullary canal 15 by cement pressure within the chamber thereby forming a pressure seal. The escape of cement through the open end of the excavated medullary canal 15 is prevented via this pressure seal insuring that the applied cement is properly pressurized and that the medullary canal 15 is prepared for implementation of the prosthetic device 10. A method of providing cement under pressure to the exposed endosteal surface 11 of a medullary canal 15 is also disclosed using this proximal femoral sealing device 10.
Inventors
- 👤 Philip Christopher Noble
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 11:46
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; A61F2/32; A61F2/36; A61F2/3662; A61F2/367; A61F2/30728; A61F2002/30729; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/3079
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
130 words
Apparatus 10 for introducing cement into a bone canal through an opening in the bone, characterized in that said apparatus has: (a) body member 12 having a passageway 26 therethrough for passage of cement; (b) generally annular wall member 14 extending from said body member 12 and defining an outer surface 13 at least a portion of which is configured and dimensioned so as to be capable of extending into the bone canal 15 and generally seal the bone opening: and (c) chamber 16 defined by said annular wall member 14, said chamber 16 communicating with said passageway 26 and with said bone canal 15 such that cement, upon its introduction into said bone canal 15, will also fill said chamber 16 so as to aid in maintaining said seal.
Claim 2
Dependent Claim
130 words
Apparatus 10 for introducing cement into a bone canal through an opening in the bone, characterized in that said apparatus has: (a) body member 12 having a passageway 26 therethrough for passage of cement; (b) generally annular wall member 14 extending from said body member 12 and defining an outer surface 13 at least a portion of which is configured and dimensioned so as to be capable of extending into the bone canal 15 and generally seal the bone opening: and (c) chamber 16 defined by said annular wall member 14, said chamber 16 communicating with said passageway 26 and with said bone canal 15 such that cement, upon its introduction into said bone canal 15, will also fill said chamber 16 so as to aid in maintaining said seal.
Claim 3
Dependent Claim
181 words
Apparatus for injecting cement into the bone canal through an opening in the bone, characterized in that said apparatus has: (a) body member 12 having a passageway 26 therethrough for passage of cement; (b) generally flexible annular wall member 14 extending from said body member 12 and defining with said body member 12 a generally continuous outer surface 13 which is configured and dimensioned such that at least a portion of said outer surface 13 corresponds anatomically to a portion of the bone canal 15 adjacent the opening so as to be capable of extending into the bone canal 15 and sealing the bone opening; and (c) chamber 16 defined by said annular wall member 14 and said body member 12, said chamber 16 communicating with said passageway 26 and with said bone canal 15 such that cement upon its injection into said bone canal 15 will also fill said chamber 16 so as to expand said flexible annular wall member 14 and thus maintain said seal 10 and aid in the penetration of cement into the bone within the canal.
Claim 4
Dependent Claim
181 words
Apparatus for injecting cement into the bone canal through an opening in the bone, characterized in that said apparatus has: (a) body member 12 having a passageway 26 therethrough for passage of cement; (b) generally flexible annular wall member 14 extending from said body member 12 and defining with said body member 12 a generally continuous outer surface 13 which is configured and dimensioned such that at least a portion of said outer surface 13 corresponds anatomically to a portion of the bone canal 15 adjacent the opening so as to be capable of extending into the bone canal 15 and sealing the bone opening; and (c) chamber 16 defined by said annular wall member 14 and said body member 12, said chamber 16 communicating with said passageway 26 and with said bone canal 15 such that cement upon its injection into said bone canal 15 will also fill said chamber 16 so as to expand said flexible annular wall member 14 and thus maintain said seal 10 and aid in the penetration of cement into the bone within the canal.
Claim 5
Dependent Claim
215 words
A proximal femoral sealing device 10 for seating within the medullary canal 15 of a prepared proximal end of a femur and for injecting cement under pressure into the medullary canal 15, characterized in that said device 10 has: (a) body member 12 having a passageway 26 therethrough for passage of cement; (b) generally flexible annular wall member 14 extending from said body member 12 and defining with said body member 12 an outer surface 13 which is anatomically shaped and conforms generally along the vertical and horizontal axes of the body member 12 to the exposed internal endosteal surface 11 shape of the proximal end of the medullary canal 15 of the femur; and (c) chamber 16 defined by said flexible wall member 14 and said body member 12, said chamber 16 opening onto and communicating at one end with said proximal end of said medullary canal 15, the other, opposite end opening onto and communicating with the distal end of said passageway 26, said chamber 16 further having a generally rounded-trapazoidal cross-sectional configuration defined by said flexible wall member 14 which is capable of expanding under pressure of cement within said chamber 16 against the exposed internal endosteal surface 11 of the medullary canal 15 so as to form a pressurization cement seal.
Claim 6
Dependent Claim
215 words
A proximal femoral sealing device 10 for seating within the medullary canal 15 of a prepared proximal end of a femur and for injecting cement under pressure into the medullary canal 15, characterized in that said device 10 has: (a) body member 12 having a passageway 26 therethrough for passage of cement; (b) generally flexible annular wall member 14 extending from said body member 12 and defining with said body member 12 an outer surface 13 which is anatomically shaped and conforms generally along the vertical and horizontal axes of the body member 12 to the exposed internal endosteal surface 11 shape of the proximal end of the medullary canal 15 of the femur; and (c) chamber 16 defined by said flexible wall member 14 and said body member 12, said chamber 16 opening onto and communicating at one end with said proximal end of said medullary canal 15, the other, opposite end opening onto and communicating with the distal end of said passageway 26, said chamber 16 further having a generally rounded-trapazoidal cross-sectional configuration defined by said flexible wall member 14 which is capable of expanding under pressure of cement within said chamber 16 against the exposed internal endosteal surface 11 of the medullary canal 15 so as to form a pressurization cement seal.
Claim 7
Dependent Claim
37 words
The seal 10 of claim 3 characterized in that said anatomically shaped outer surface 13 generally corresponds to the outer surface shape of a broach utilized to expose the endosteal surface 11 of the medullary canal 15.
Claim 8
Dependent Claim
28 words
The seal 10 of claim 3 characterized in that said anatomically shaped outer surface 13 generally corresponds to the natural internal surface shape of the medullary canal 15.
Claim 9
Dependent Claim
22 words
The seal 10 of claim 3 characterized in that said anatomically shaped outer surface 13 further comprises a plurality of ridges 51.
Claim 10
Dependent Claim
30 words
The seal 10 of claim 6 characterized in that said plurality of ridges 51 are dimensioned and configured so that leading edges thereof contact the exposed internal endosteal surface 11.
Claim 11
Dependent Claim
35 words
The seal 10 of claim 3 characterized in that the proximal end of said anatomically shaped outer surface 13 is wider than the distal end along a cross-section of the vertical axis of the seal.
Claim 12
Dependent Claim
52 words
The seal 10 of claim 3 characterized in that the portion of said substantially anatomically shaped outer surface 13 on the medial side of said medullary canal 15 ranges from a straight surface to one which is curved form the proximal to distal end of said substantially anatomically shaped outer surface 13.
Claim 13
Dependent Claim
32 words
The seal 10 of claim 3 characterized in that said wall member 14 is thicker at the proximal end of said chamber 16 than at the distal end of said chamber 16.
Claim 14
Dependent Claim
26 words
The seal 10 of claim 10 characterized in that said wall member 14 tapers to reduce in thickness from said proximal end to said distal end.
Claim 15
Dependent Claim
20 words
The seal 10 of claim 3 characterized in that said passageway 26 is centrally disposed in the body member 12.
Claim 16
Dependent Claim
25 words
The seal 10 of claim 3 characterized in that said passageway 26 is dimensioned and configured to receive a nozzle 27 for injection of cement.
Claim 17
Dependent Claim
30 words
The seal 10 of claim 3 characterized in that a medial portion of said body member 12 is inset from the medial portion of said anatomically shaped outer surface 13.
Claim 18
Dependent Claim
16 words
The seal 10 of claim 3 characterized in that said passageway 26 is cylindrical in shape.
Claim 19
Dependent Claim
31 words
The seal 10 of claim 3 characterized in that said passageway 26 narrows to form a gasket-seal 28 so as to restrain a cement nozzle 27 inserted through said passageway 26.
Claim 20
Dependent Claim
25 words
The seal of claim 3 characterized in that said body member 12 and flexible annular wall member 14 are formed to a medical grade elastomer.
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