Surgery – Instruments – Suturing needle
Patent
1996-02-23
1998-03-10
Buiz, Michael
Surgery
Instruments
Suturing needle
606222, A61B 1706
Patent
active
057255555
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to an atraumatic needle for use in surgical suturing machines, which has a plunger for receiving the needle in a needle holder moving on an arc-shaped path, as well as an essentially cylindrical and curved shaft with an eye for the passage of the thread, and a tip joining the eye.
BACKGROUND OF THE INVENTION
The preparation of sutures by hand in tissues in human medicine and veterinary medicine requires, on the one hand, a great skill, and, depending on the structure of the tissue, it is possible only by the application of relatively strong forces by the surgeon. Needles with a so-called cutting tip, which have, e.g., the shape of a triangular tip (cf. DE-OS 37 12 163), have been used, among other things, to reduce the piercing force to be applied.
Even though surgical suturing machines, which are described in, e.g., DE-PS 37 02 015, are able to apply the piercing forces occurring during the use of a device provided with a conical tip, a strong force and consequently a relatively high pressure, which lead to deformations of the edge area of the insertion channel (a hole or opening formed by the insertion of the needle in the skin parts), are applied here to the tissue surfaces prior to the insertion proper. Even though such deformations affect only an area of a few tenths of one millimeter, they nevertheless reduce the reliability of suture formation insofar as the thread loop to be grasped by the shuttle of the surgical suturing machine is not sufficient or--relative to the movement of the shuttle--is not in the correct position or it is not formed at the correct point in time during the movement of the shuttle.
Since the formation of so-called missed stitches may lead to serious consequences for the patient, especially in human medicine, it is necessary to ensure, already at the time of insertion of the needle into the tissue, that the insertion forces generated in this process will not unfavorably affect the subsequent stitch formation.
SUMMARY AND OBJECTS OF THE INVENTION
The primary object of the present invention is therefore to provide a needle for surgical suturing machines which does not exert any effect on the tissue that would compromise the reliability of stitch formation and especially of loop formation during its insertion into the tissue, on the one hand, and which does not expand the insertion channel beyond the absolutely necessary extent, on the other hand.
According to the invention, an atraumatic needle is provided for use in surgical suturing machines, which has a plunger for receiving the atraumatic needle and a needle holder moving on an arc-shaped path, as well as an essentially cylindrical and curved shaft with an eye for the passage of the thread, and a tip joining the eye. The radius of curvature of the shaft essentially corresponds to the radius of curvature of its path of movement. A flattened area (flattened surface) is provided in the area of the tip on both the outer surface and the inner surface of the shaft. The two flattened areas extend at acute angles in relation to one another. A cutting line of the flattened area is located on the outer radius of curvature of the shaft to form an edge. The edge is directed at right angles to a longitudinal axis of a shaft and is located essentially on the outer radius of curvature of the shaft.
The invention provides that no deformations occur in the edge area of the insertion channel due to the design according to the present invention, particularly due to the equal radii of curvature of both the shaft and its path of movement. The invention also provides that the lateral forces generated due to and during the formation of the insertion channel are considerably reduced due to the spade-shaped edge arranged on the outer surface of the shaft, and they always act only in one direction, namely, in the direction of the outer surface of the shaft. Deformations in the edge area of the insertion channel are avoided as a result further, the shaft of the needle is always pressed to t
REFERENCES:
patent: 2336689 (1943-12-01), Karle
patent: 5046438 (1991-09-01), Hakui
patent: 5178628 (1993-01-01), Otsuka et al.
patent: 5476480 (1995-12-01), Matsutani et al.
Buiz Michael
Pham Tina T. D.
LandOfFree
Atraumatic needle for surgical suturing machines does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Atraumatic needle for surgical suturing machines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Atraumatic needle for surgical suturing machines will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-135150