Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1990-12-20
1991-12-10
Shay, Randy Citrin
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
623 18, 623 22, 623 38, A61F 100
Patent
active
050714350
ABSTRACT:
A bone prosthesis (10) which is hydraulically operated is disclosed. It comprises a cylinder (12), which is closed at one end, and piston (28), which slides inside the cylinder (12). The relative locations of the cylinder (12) and piston (28) are controlled by a liquid (26) filled bladder (24) which is located inside the cylinder (12). Liquid (26) is introduced into the bladder (24) via a valve (22) which fits through the side wall (21) of the cylinder (12). The valve (22) is constructed so that liquid (26) can be introduced to or removed from the bladder (24). One end of the prosthesis (10) is shaped to mate with the remaining segment of bone. The other end of the prosthesis (10) is shaped to replace the other end of the surgically removed bone segment. In addition, the internal surface (18) of the cylinder (12) and the external surface (30) of the piston (28) are grooved or keyed so as to prevent rotation of the piston (28) inside the cylinder (12). The entire prosthesis (10) is fabricated from bio-compatible materials. A method of surgically inserting and post-operatively lengthening this invention is also disclosed.
REFERENCES:
patent: 4157715 (1979-06-01), Westerhoff
patent: 4892546 (1990-01-01), Kotz et al.
"A Growth-Imitating Lengthening Element for Modular Femoral Endoprostheses", van Krieken et al., Bristol-Meyers Orthopedic Symposium 1985.
"Design & Clinical Use of Extending Prosthesis", Scales et al., Bristol-Myers Orthopaedic Symposium, 1985.
"Extendible Prosthesis: An Alternative to Amputation", Lewis et al., Bristol-Myers Orthopaedic Symposium, 1985.
"Biomechanical Evaluation of an Extending Adjustable Tumor Prosthesis", Spires et al., Bristol-Meyers Orthopaedic Symposium, 1985.
Drobish Kenneth M.
Fuchs Albert
Shay Randy Citrin
Townsley Norton R.
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