DE29604518U1 - Aneurysm clamp - Google Patents

Description

11 March 1996 _{&psgr; m} ...... .. .· Müller-Bore & Partner

Applicant: von Zeppelin Chirurgische Instrumente GmbH

"Aneurysm clamp"

Our symbol: Z 1453 - kg / el

Description

&igr; The present invention relates to an aneurysm clamp according to the preamble of claim 1. Such an aneurysm clamp is known, for example, from EP 0 421 161 B1 and is used in particular for clamping blood vessels or aneurysms in surgery. In the known clamp, the reset device is a closing spring attached to the free ends of the operating branches. The closing spring has the task of fixing the clamp on the one hand and of pre-tensioning the two jaw parts on the other. The stabilizing effect of the known clamp is inadequate because the two arms are only stabilized at their outermost ends, namely at the free ends of the operating branches. In practice, in special applications, shear forces can occur between the jaw parts, which pull the entire clamp apart.

The object of the present invention is therefore to further develop the generic aneurysm clamp in such a way that it is better stabilized or stiffened.

This object is achieved according to one aspect of the present invention in that it has a reset device which is attached to the two operating branches at a connection point which is offset from the free end of the respective operating branch in the direction of the crossing area. As a result, the opposing operating branches are stiffened in a central region so that better stability is achieved.

Preferably, the connecting part is at least 1 mm, preferably 2-5 mm, particularly preferably 3-4 mm away from the free end of the respective operating branch, in these areas particularly good stability can be achieved

11 March 1996 Müller-Bore & Partner

On the other hand, there is no danger of the connection point moving into the immediate vicinity of the crossing area and thereby pulling the two jaws apart - which is undesirable.

According to a second aspect of the present invention, a bridge web is stretched between the operating branches, which serves to stiffen them. The bridge web fixes or stabilizes the two opposing operating branches alternatively or in addition to the above-mentioned specially arranged reset device. Since the bridge web has no reset function its arrangement is also unproblematic in the vicinity of the crossing area.

Particularly preferably, the bridge web is connected to the opposite operating branches in an area between the connecting part of the reset device and the crossing area. It has been found that this combination of the special arrangement of the reset device and the bridge web results in a particularly stable clamp.

Particularly preferably, the return device is a coil spring and the bridge web crosses at least one turn of the coil spring. This feature results in a particular reinforcement of the stiffening effect of the coil spring by the bridge web and additionally increases the stability achieved in the area of the coil spring.

According to a further aspect of the invention, one arm is recessed in the crossing area and the other arm engages in the recessed area, wherein a tensioning web is provided in the crossing area, the ends of which are attached to the recessed arm on both sides of the crossing area in such a way that the tensioning web engages over the other arm and urges it against the recessed arm.

This arrangement leads to a special stabilization in the crossing area and can be used as an alternative to each of the two previous aspects of the

11 March 1996 Nlüller-Bore 81 Partner

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invention and in addition to these. The tensioning web overlaps both arms in the crossing area and pushes them towards each other, so that the risk of the two arms becoming separated from each other due to shear forces is significantly reduced or eliminated.
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In an embodiment that is preferred in all aspects, the jaws are each provided with a bulge. This makes it possible to guide other blood vessels or other body parts through the clamp without hindrance.

Other advantages, features and possible applications of the present invention will become apparent from the following description of an embodiment in conjunction with the drawing.

Fig. 1 shows a plan view of an embodiment of the inventive

appropriate aneurysm clamp.

Fig. 2 shows a side view of the clamp of Fig. 1.

The aneurysm clamp shown in Fig. 1 has an arm consisting of a jaw part 2 and an operating branch 8 and another arm consisting of a jaw part 4 and an operating branch 6. The jaw parts 2, 4 are essentially straight or curved metal parts in a plane which, when placed against one another, are intended to clamp off a blood vessel or an aneurysm.

The operating branches are essentially metal parts with a circular cylindrical cross-section, which are pushed apart by a contact instrument in such a way that the jaw parts 2, 4 also move apart.

The two operating branches 6, 8 are connected to one another by a return device 12 designed as a helical spring, whereby the connection points with the operating branches are offset from the free end of the respective operating branch 6, 8 in the direction of the jaw parts 2, 4. The helical spring 12 tensions the two operating branches 6, 8 connected by it.

March 11, 1996

Miiller-Bore & Partner

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towards each other so that the two jaw parts 2, 4 are also pre-tensioned towards each other. This is achieved by crossing the two arms. The two arms form a crossing area 10 in a transition area between the jaw parts 2, 4 and the operating branches 6, 8, which is designed differently depending on the opening position of the clamp, since the arms cross each other without a pivot bearing.

The connection point of the closing spring ends or coil spring ends 12 with the operating branches 6, 8 is at least 1 mm, preferably 2-5 mm and particularly preferably about 3-4 mm away from the free end of the respective operating branch, with the turns of the coil spring extending in the area between the connection points and the crossing area 10.

Alternatively or in addition to the specially designed coil spring 12 connected to the operating branches 6, 8, a bridge web 14 is stretched between the operating branches 6, 8, which stiffens them and thus additionally stabilizes them. In the embodiment shown, the bridge web 14 extends across the winding or windings of the coil spring 12 and therefore increases their stabilizing effect.

Finally, as an alternative or in addition to the special coil spring 12 and the bridge web 14, a recessed area 16 is provided on one arm in the crossing area 10. The other arm extends into this recessed area 16, so that in the side view of Fig. 2 an area of constant thickness is obtained. A tension web 18 is stretched over the crossing area, which is attached to various areas of the arm 2, 8 provided with a recess 16. The tension web 18 is attached in such a way that it bridges the other arm 4, 6 extending in the recess 16 and at the same time presses against the recessed arm 2, 8. In this way, a special stiffening and stabilization is achieved in the crossing area, which prevents the clamp from moving apart due to shear forces.

11 March 1996 Müller-Bor4 & Partner

The clamp according to the invention also has a bulge 20, 22 in its jaw parts 2 and 4, so that the two bulges defined in the same area of the jaw parts 2, 4 define a free space in the closed position of the clamp through which a blood vessel, a tendon or the like can be guided unhindered. In the present case, the bulges 20, 22 have a semicircular shape, so that in the closed state a recess with a circular cross-section is created.

Claims (7)

11. Win 1996 Müller-Bore Si Partner Applicant: von Zeppelin Chirurgische Instrumente GmbH "Aneurysm clamp" Our reference: Z 1453 - kg / el Claims 1. Aneurysm clamp with two arms, each having a jaw part (2; 4) and an operating branch (6; 8), which form a crossing area (10), the operating branches (6, 8) lying opposite one another and being connected to one another by a reset device (12) which prestresses the jaw parts (2, 4) against one another, characterized in that the reset device (12) has two ends which are each attached to the two operating branches (6, 8) at a connection point which is offset from the free end of the respective operating branch (6; 8) in the direction of the crossing area (10). 2. Aneurysm clamp according to claim 1, characterized in that the connection point is at least 1 mm, preferably 2-5 mm, particularly preferably about 3-4 mm away from the free end of the respective operating branch. 3. Aneurysm clamp with two arms, each having a jaw part (2; 4) and an operating branch (6; 8), which form a crossing area (10), the operating branches (6; 8) lying opposite one another and being connected to one another by a return device (12) which prestresses the jaw parts (2; 4) against one another, characterized in that a bridge web (14) is stretched between the operating branches (6; 8), which serves for stiffening. 4. Aneurysm clamp according to claim 3, characterized in that the bridge web (14) in a region between the connection point of the March 11, 1996 Muller-Bore 81 Partner reset device and the crossing area (10) with the operating branches (6; 8). 5. Aneurysm clamp according to claim 3 or 4, characterized in that the return device (12) is a helical spring and the bridge web (14) crosses at least one turn of the helical spring (12). 6. Aneurysm clamp with two arms, each having a jaw part (2; 4) and an operating branch (6; 8), which form a crossing area (10), the operating branches being opposite one another and being connected to one another by a restraint device (12) which prestresses the jaw parts (2; 4) against one another, characterized in that one arm (2, 8) is recessed in the crossing area (18) and the other arm (4, 6) engages in the recessed area, a tensioning web (18) being provided in the crossing area, the ends of which are attached to the recessed arm (2, 8) on both sides of the crossing area (10) in such a way that the tensioning web (18) engages over the other arm (4, 6) and presses it against the recessed arm (2, 8). 7. Aneurysm clamp according to one of the preceding claims, characterized in that the jaw parts (2, 4) each have a bulge (20; 22).