Bone rasp for a femur head prosthesis

Details Bone rasp for a femur head prosthesis Bone rasp for a femur head prosthesis

2000-02-10

2001-11-20

Philogene, Pedro (Department: 3732)

Surgery

Instruments

Orthopedic instrumentation

C606S079000

Reexamination Certificate

active

06319256

ABSTRACT:

The invention relates to a bone rasp for a femur head prosthesis in accordance with the preamble of claim
1
.
The known rasps have an elongate, conical body with a rectangular cross-section. Cutting ribs are formed at the body which are arranged transversely to the longitudinal axis of the body and which have the same cross-sectional shape and dimensions.
In the use of the rasp, substantially the same amount is ablated over the whole length. In this it proves disadvantageous that in regions with greater cone angle in particular an excess amount is ablated or a blocking of the rasp takes place, although it has not yet centered itself through forces acting at all sides. For a surgeon it is therefore difficult to correctly interpret the resistance of the rasp on hammering it in.
The invention, as is characterised in the claims, satisfies the object of improving a bone rasp for a femur prosthesis.
One property lies in that for a given cutting rib geometry the shaving space decreases over-proportionally at smaller cutting rib spacing. The shaving spaces between the cutting ribs with small spacing, which are provided at locations with a greater cone angle, fill up relatively rapidly and prevent too great a local ablation. When the rasp is hammered in, the forces arising radially at the rasp equalise one another in such a manner that a self-guiding arises in the marrow chamber in which the relatively thin-walled corticalis remains medially in the proximal part.
In contrast to hollow rasps with an excessively large chip space, the bone chips are not carried out of the marrow chamber due to the intentionally adapted undercuttings, but rather are thrust deeper with each new hammering in and compressed in the regions which do not lie in contact with the rasp until the rasp has a full peripheral contact with cut open or with compressed bone matter.


REFERENCES:
patent: 4765328 (1988-08-01), Keller et al.
patent: 4921493 (1990-05-01), Webb, Jr.
patent: 5454815 (1995-10-01), Geisser et al.
patent: 5665091 (1997-09-01), Noble et al.
patent: 5931841 (1999-08-01), Ralph
patent: 0378044A1 (1990-07-01), None
patent: 0563585A1 (1993-10-01), None

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