Method and apparatus for removing pre-placed prosthetic joints and preparing for their replacement
First Claim
1. 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, said method comprising:
- (a) pulling the appliance from the mantle of hardened cement to leave a cement cavity within the mantle;
(b) injecting a fluid mass of methylmethacrylate cement into the cement cavity;
(c) inserting a post having an irregular exterior surface into the fluid mass of methtylemethacrylate cement;
(d) permitting said fluid mass of methylemethacrylate cement to harden and bond to the post and the hardened mantle; and
,(e) applying tension to the post to pull the post and the bonded mantle of methylemethacrylate cement from the bone cavity.
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Accused Products
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 appliance is inserted into the fluid cement and the fluid cement is permitted to cure to bond the appliance to the mantle. Tension is then applied to the pulling appliance to remove the appliance and the cement mantle from the bone cavity as a unit. The fluid cement partially dissolves and softens the hardened cement mantle so that an integral cement mass is formed upon curing of the fluid cement. The pulling appliance is of a screw-like configuration, with means to connect a slap-hammer to its proximal end.
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Citations
23 Claims
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1. 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, said method comprising:
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(a) pulling the appliance from the mantle of hardened cement to leave a cement cavity within the mantle; (b) injecting a fluid mass of methylmethacrylate cement into the cement cavity; (c) inserting a post having an irregular exterior surface into the fluid mass of methtylemethacrylate cement; (d) permitting said fluid mass of methylemethacrylate cement to harden and bond to the post and the hardened mantle; and
,(e) applying tension to the post to pull the post and the bonded mantle of methylemethacrylate cement from the bone cavity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for removing a hardened mantle of methylemethacrylate cement adhered to a bone, said method comprising:
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(a) placing a mass of fluid methylemethacrylate cement in intimate contact with the hardened mantle of cement to at least partially dissolve and soften the hardened mantle; (b) imbedding a pulling appliance within the fluid cement; (c) permitting the fluid mantle of cement and softened mantle to cure and bond together; and
,(d) applying tension to the pulling appliance to pull the appliance and the bonded mantle from the bone. - View Dependent Claims (12)
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13. A method for removing a pre-placed prosthetic hip joint secured in place within a bone cavity in the end of the femur adjacent the torchanter by a mantle of hardened cement and conditioning the bone cavity for receipt of a new joint, said method comprising:
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(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) inserting a post having an irregular exterior surface into the mass of fluid cement; (d) permitting said mass of fluid cement to harden and bond to the post and the hardened mantle; and
,(e) applying tension to the post to pull the post and the bonded mantle of cement from the bone cavity. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification