Transcutaneous pin for fixation of a bone part or fragment

Details Transcutaneous pin for fixation of a bone part or fragment Transcutaneous pin for fixation of a bone part or fragment

1990-01-23

1990-12-18

Hafer, Robert A.

Surgery

Instruments

Orthopedic instrumentation

606 73, 606 80, A61F 504

Patent

active

049783505

ABSTRACT:
A transcutaneous fixation pin includes a threaded portion with flutes evenly spaced over the circumference of the pin at the anterior end of the threaded portion so as to perform a tapping operation when the end of the threaded portion penetrates a bone fragment. The flutes take the form of a notch creating a cutting edge of the tap, with clearance relief being provided behind the cutting edge of the tap which approaches the centerline of the pin until it reaches the next notch, so as to form a clearance angle. In a modification the flutes are disposed helicoidally in relation to the axis of the thread, with the helix and the thread being pitched in the same direction.

REFERENCES:
patent: 1923177 (1933-08-01), Tucker
patent: 2388482 (1943-01-01), Haynes
patent: 2532296 (1950-12-01), Giesen
patent: 4414966 (1983-11-01), Stednitz
patent: 4537185 (1985-08-01), Stednitz
patent: 4541422 (1985-09-01), de Zbikowski
patent: 4612921 (1986-09-01), de Zbikowski
patent: 4640271 (1987-02-01), Lower
Richards Technical Publication No. 4167, "Bone Screw Technical Information," 1980, pp. 1-14.

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