External fixator with controllable damping
First Claim
1. An external fixator for correcting and reducing fragments of a bone comprising in operable communication:
- a bar (1, 100,
200) to be disposed substantially parallel to the bone and having a longitudinal axis therethrough;
a casing operatively connected to said bar for longitudinal movement with respect thereto;
at least a first support (3) coupled to said casing and a second support (2) coupled to said bar for orienting pins to be inserted into said bone fragments;
a displacement member (6,
201) acting between said bar and said second support for adjusting the distance between said first support and said second support and for preventing rotation between said first support and said second support;
said casing is adapted to move relative to a sliding block (70,
270) fixed to said bar so as to obtain a longitudinal reciprocating movement of said casing with respect to said bar and so as to avoid angular displacement of said casing with respect to said bar;
a damping member (90,
290) acting between said bar and said casing for damping the longitudinal displacement of said first and second supports;
an adjustable stop mounted between said bar and said casing to limit the longitudinal movement of said first and second supports towards one another;
said second support (2) is displaceable longitudinally relative to said first support by means of said displacement member (6,
201); and
means for adjusting the damping action of said damping member.
3 Assignments
0 Petitions
Accused Products
Abstract
This external fixator for the correction and reduction of bone fragments comprises a bar (1) fastened to a biocompression system (5), on which bar and system are disposed the supports (2,3) for fastening the pins inserted into the bones, the components of which supports are movable in accordance with the arrows A, B, C and D. The member (6) permits the longitudinal displacement of the clip (2) in the direction of the arrow E, while the biocompression system (5) makes a reciprocating movement in accordance with the arrow F.
A damping member (90,290) cooperates with means for regulating the force applied which are disposed outside the bar. Graduated markings (99,283) indicate the value of the force applied.
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Citations
25 Claims
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1. An external fixator for correcting and reducing fragments of a bone comprising in operable communication:
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a bar (1, 100,
200) to be disposed substantially parallel to the bone and having a longitudinal axis therethrough;a casing operatively connected to said bar for longitudinal movement with respect thereto; at least a first support (3) coupled to said casing and a second support (2) coupled to said bar for orienting pins to be inserted into said bone fragments; a displacement member (6,
201) acting between said bar and said second support for adjusting the distance between said first support and said second support and for preventing rotation between said first support and said second support;said casing is adapted to move relative to a sliding block (70,
270) fixed to said bar so as to obtain a longitudinal reciprocating movement of said casing with respect to said bar and so as to avoid angular displacement of said casing with respect to said bar;a damping member (90,
290) acting between said bar and said casing for damping the longitudinal displacement of said first and second supports;an adjustable stop mounted between said bar and said casing to limit the longitudinal movement of said first and second supports towards one another; said second support (2) is displaceable longitudinally relative to said first support by means of said displacement member (6,
201); andmeans for adjusting the damping action of said damping member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An external fixator for correcting and reducing fragments of a bone comprising:
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a bar having a hollow interior defining a central longitudinal axis, said bar having a first support slidably mounted thereon for orienting bone pins to be connected to a first bone fragment; a first tubular shaft extending along said axis rigidly mounted within said hollow interior and extending from an end thereof; a second shaft slidably received within said tubular shaft for relative movement therebetween; a casing slidably mounted on said first tubular shaft and rigidly connected to a first end of said second shaft, said casing having a second support for orienting bone pins to be connected to a second bone fragment; and damping means acting between said bar and said second shaft along said longitudinal axis to dampen relative movement between said bar and said casing. - View Dependent Claims (23, 24, 25)
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Specification