Means for Fixing Prostheses, Method of Inserting a Prosthesis Into a Grain Bed and a Prosthesis Insertion Unit
OwnerLars Bruce, Bengt Mjoberg +1inventors
InventorsLars Bruce, Bengt Mjoberg, Lars Magnus Bjursten
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Abstract
A method and an insertion unit for inserting an elongate prosthesis into a prosthesis fixing device. This device comprises a bed of grains and biocompatible material, and a vibrating tool is used for insertion, the vibration head of which performs an oscillating motion back and forth about a swivelling axis (3′). According to the invention, said axis (3r) of the vibrating tool essentially coincides with the longitudinal axis (I1) of the elongate prosthesis (1). The method and the insertion unit provide a prosthesis fixing device consisting of said bed, in which the grains are evenly packed along the length of the prosthesis.
Claims11
A device for fixing an elongate prosthesis part, such as a stem of a femoral prosthesis, to living bone tissue, which defines a cavity in which a length of the prosthesis is received with a gap to the boundary of the cavity, substantially the entire cavity being occupied by loose but packed grains, irregular in shape, of a material which is accepted by bone tissue, which grains are essentially plastic or non-essentially elastic and lock each other, characterised in that the grains are uniformly packed along the length of the prosthesis part in the cavity.
A method of inserting an elongate prosthesis into a prosthesis fixing device, which comprises a bed of grains of biocompatible material, a vibrating tool being used for insertion, the vibrating head of which performs an oscillating motion back and forth about a swivelling axis (3′), characterised in that said swivelling axis (3′) of the vibrating tool is allowed to essentially coincide with the longitudinal axis (1′) of the elongate prosthesis (1).
A prosthesis insertion unit for inserting an elongate prosthesis into an elongate body cavity substantially in the longitudinal direction thereof, said body cavity being substantially filled with a bed of grains of biocompatible material, characterised in that it comprises
- (A) a motor-driven (2) vibrating head (3) arranged to oscillate in a swivelling motion back and forth about a swivelling axis (3′),
- (B) the prosthesis (1) and
- (C) an adapter (4, 6) designed to rigidly connect the oscillation head (3) and the prosthesis (1) to each other in such a manner that the swivelling axis (3′) of the oscillation head (3) and the longitudinal axis (1′) of the prosthesis (1) essentially coincide with each other.
Dependencies are inferred from the claim text.