Surgery – Instruments – Surgical mesh – connector – clip – clamp or band
Reexamination Certificate
1999-12-10
2001-07-17
O'Connor, Cary E. (Department: 3732)
Surgery
Instruments
Surgical mesh, connector, clip, clamp or band
Reexamination Certificate
active
06261303
ABSTRACT:
The present invention relates to the subject matter disclosed in German patent application 198 58 581.0 of Dec. 18, 1998, the entire specification of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
The invention relates to a U-shaped surgical clip having two arms that are connected to one another via a deformable web.
With such surgical clips the application is performed by compressing the two arms, whereby the vessel to be clamped is disposed between the arms. The web connecting the two arms has to be deformed at the same time, i.e. it is distorted, and in so doing it is desirable to require the smallest possible deformation forces for the distortion of the web during the application operation. On the other hand, the web however has to have a certain stability in the non-deformed state of the clip, since it has to be ensured that the clip remains in the open state, for example upon insertion into an application magazine. In such magazines the clips are guided by laying the outer side of the arms against guide faces, and it is therefore important that the spacing of the arms is maintained; the web is responsible for ensuring this spacing and it therefore has to apply a certain strength.
SUMMARY OF THE INVENTION
The object of the invention is to construct a generic surgical clip so that it firstly has sufficient stability in the web region at least in the non-deformed state, but upon deformation offers slight resistance in this region.
This object is achieved in accordance with the invention with a surgical clip of the type described at the beginning in that the web at least in some sections bears a parallel web that is fixed to either side of the web, and which restricts the deformability of the web in the reinforcing section of the web in which the parallel web and web are disposed next to one another.
Such a reinforcement of the web, which occurs at least in some sections, results in that the non-deformed web can keep the arms spaced from one another in the desired manner, secondly upon the deformation of the web, possibly with the simultaneous deformation of the parallel web, it is possible to reduce this strength, since curved webs can offer slight resistance to such a deformation by virtue of the geometric changes.
It is particularly advantageous if the strength of the parallel web is less than that of the web, so that the parallel web breaks upon the deformation of the web and consequently the reinforcement in the reinforcement section is removed.
It may be particularly specified that the reinforcing section is the central section of the web.
In a preferred embodiment it is specified that the web is bulged in a curve in the reinforcing section and the parallel web is disposed on the inner side of the bulge.
In particular with such an arrangement it is favorable if the parallel web bears projections which upon the bending aside of the web in the reinforcing section lie against the web and as a result maintain the bulge. As a result the bulged web is prevented from being deformed upon the distortion of the web with the formation of impermissibly small curvatures, which could result in damage.
In particular, the projections may be thickened portions in the parallel web, between which a weakened predetermined breaking point of the parallel web is situated. Thus it is possible that, even after the breaking of the parallel web, the thickened portions still guarantee the bulging of the web in the reinforcing section.
The parallel web can join the web with both ends, in a modified embodiment it may also be specified that the parallel web extends between two projections of the web, for example when the web bears catch projections which, when the clip is applied, engage in catch recesses of the arms. In another embodiment it is specified that the parallel web extends between a projection of the web on the one hand and the web itself on the other hand.
It is advantageous if the web is constructed as a flexible strip, at least in the reinforcing section, so that an integral hinge connection is constructed.
In a preferred embodiment it is also specified that, via the junction point of the arms with the web, the arms comprise rearwardly projecting extensions which bear catch means, which upon the compression of the arms fix the extensions to one another. As a result it is ensured that the deformed clip remains in the compressed position even when the web itself has not got a sufficiently stable construction to absorb the entire clamping forces of the clip.
At the same time it is advantageous if the catch means fixing the extensions to one another are disposed at the rear end of the extensions.
Furthermore, it may be specified that at the front end of the clip the arms bear catch means, which fix the arms to one another upon the compression of the arms. These catch means also hold the two arms together in the applied state, these catch means can be provided either alone or in combination with the catch means on the rear end of the arms.
The clip is preferably made from plastics material, in particular from a reabsorbable plastics material.
It is favorable if both arms are outwardly curved and the convex sides are faced towards one another, and as a result the central regions of the applied clip exert uniform compressive forces on the clamped container.
This effect is further enhanced if the arms have a smaller cross section in the central region than in the front region and than in the rear region.
The following description of preferred embodiments of the invention serves for further explanation in conjunction with the drawings.
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Mayenberger Rupert
Weisshaupt Dieter
Aesculap AG & Co. KG
Lipsitz Barry R.
O'Connor Cary E.
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