Surgery – Truss – Pad
Patent
1987-11-17
1989-10-17
Hindenburg, Max
Surgery
Truss
Pad
128321, A61B 1730
Patent
active
048739790
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a microsurgical instrument for use as pincers or scissors.
More precisely, it relates to such an instrument of the type comprising two rigid longitudinal arms which are mutually pivoted about a defined transverse axis and having on the one hand respective proximal ends and on the other hand respective distal ends, the said distal ends being longitudinally spaced with respect to the said axis and adapted to co-operate in a pinching or cutting action, respectively, by relative rotation of the two arms about the said axis in a first direction corresponding to a mutual approach of the said distal ends, the arms having respective manual operation zones for relative rotation about the said axis in the said first direction whilst there is provided means for resilient urging the arms in relative rotation about the said axis in a second direction opposite from the said first direction and corresponding to a mutual spacing of the said distal ends.
In the presently known manner of production, instruments of this type are characterised by the fact that the transverse axis for mutual pivoting of the two rigid longitudinal arms is situated between the proximal ends and the distal ends, generally nearer to the distal ends than the proximal ends; the manual operation zones of the arms are then situated at the proximal ends, and the resilient urging means for the arms are constituted by two leaf springs of which each extends approximately longitudinally of a respective arm, with which it is rigid at the proximal end of this; the two blades being curved the one towards the other from the proximal ends of the arms and pivoting the one on the other at a certain distance from these proximal ends.
Such a structure has a certain number of inconveniences resulting from the proximity of the mutual pivot axis of the arms to the distal ends of these latter.
If the instrument is a needle-holder, that is to say a pincers intended for the manipulation of a needle carrying a suture, this proximity brings about a significant risk of catching of the suture in the pivot, that is to say breaking of the suture which is very weak.
If the instrument is a pair of scissors, of which the arms have at their distal ends the form of blades able to co-operate in a cutting action by mutual crossing, the closeness of the pivot axis and the blades complicates the geometry of these latter.
Further, as the instrument is conceived either as a pincers or as a pair of scissors, the proximity of the pivot axis with respect to the distal ends of the arms necessarily associates with a predetermined mutual spacing of these distal ends a relatively large angular opening between the two arms.
There results on the one hand that the movement of the arms in the first direction, that is to say in the direction of mutual approach of the distal ends, is translated by a tendency of these latter to move longitudinally whatever finds itself between them, which is a needle if the instrument is a needle-holding pincers, a muscle or tissue if the instrument is a pincers or pair of scissors, which interferes with the precision of the operation, which can be crucial in the field of microsurgery.
There results on the other hand that a determined mutual spacing of the distal ends of the arms corresponds to a much more significant spacing of the proximal ends of these arms, when these proximal ends are further extended from the pivot axis than the distal ends; so that, for a determined amplitude of movement of mutual approach or mutual spacing of the distal ends there corresponds a much more significant amplitude of movement of mutual approach or mutual spacing of the proximal ends where the manual operation zones of the arms are situated; there results a significant encumbering of the instrument in the hand of the surgeon, which is translated by a certain discomfort of use and by a difficulty of control with precision of the relative positions of the distal ends of the arms; further, it is noted that this significant encumbering in the hand of the
REFERENCES:
patent: 4198980 (1980-04-01), Clark
patent: 4212305 (1980-07-01), Lahay
patent: 4248233 (1981-02-01), von Zeppelin et al.
patent: 4318313 (1982-03-01), Tartaglia
patent: 4442837 (1984-04-01), Keatley
patent: 4446866 (1984-05-01), Davison
patent: 4452106 (1984-06-01), Tartaglia
patent: 4506669 (1985-03-01), Blake
LandOfFree
Micro-surgical instrument for use as gripper of scissors does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Micro-surgical instrument for use as gripper of scissors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Micro-surgical instrument for use as gripper of scissors will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1738448