Surgery – Instruments – External pressure applicator
Patent
1990-05-17
1992-01-28
Thaler, Michael H.
Surgery
Instruments
External pressure applicator
24168, A61B 1712
Patent
active
050840622
DESCRIPTION:
BRIEF SUMMARY
The invention pertains to a device for stopping the flow of blood in extremities as described in the characterizing part of claim 1.
In this device, which is already known from DE-OS 35 38 583, the base runs flat as far as the forward edge of the clamping device, i.e., the edge facing the loop. The part of the strap that forms the loop is bent at the forwardmost edge of the base, forcing the strap to follow a path along the base. The strap is clamped farther back on the base in the clamping zone.
When the device is used, the loop is placed around an extremity, for example, an arm, and the end of the strap is pulled through the clamping device until the loop surrounds the arm tightly enough. When this is done, the loop becomes smaller, a segment of the strap is pulled into the clamping device over the above-described forward edge, and the end of the strap extending beyond the clamping device becomes longer. However, when the loop is tightened and the strap enters the clamping device, the skin in contact with the inner surface of the strap is pulled along with the loop and forms a fold. As the loop is drawn further into the strap clamp, the fold of skin is clamped tighter and tighter, causing pain.
The objective of the invention was to improve the device of the type described above in such a way that skin cannot be drawn into the strap clamp so far as to cause pain.
This objective is accomplished by the device specified in patent claim 1.
The transverse rib initially raises the strap higher than is necessary for the strap to run into the base. It then runs down to the base and, at least in the clamping region, rests against the base. Therefore, the strap is bent at a greater angle than in state-of-the art devices of this type. As a result, the skin that is drawn in by friction is behind the transverse rib and thus no longer rests against the strap inside the strap clamping device. The transverse rib produces separation between the strap and the skin that is drawn in frictionally by the strap. This could also be described as a type of separation edge. This eliminates tight squeezing of the skin and prevents pain. The skin is still drawn in by the strap, but it is no longer pulled into a constriction transverse to the strap, where pinching or clamping could occur.
In another design, the transverse rib has an inclined surface for supporting the strap. The inclined surface basically follows the direction of the entering segment of the loop. In this way, the bending of the strap does not occur directly at the front face but rather a few millimeters behind it, e.g., three to five millimeters.
In another design improvement, the inclined surface is inclined at an angle of 30.degree. to 60.degree. to the base and preferably at an angle of 45.degree.. This produces the desired, relatively large bending angle of the strap. The inclined surface defines the angle of entry of the strap; behind the inclined surface and the transverse rib, the strap is bent back towards the base in the opposite direction. In this way, there is a total bend of at least 50.degree. (with respect to the unbent direction).
In another design improvement, the upper edge of the transverse rib is displaced relative to a frontal face of the clamping device that faces the loop, and it is preferably displaced by at least the width of the strap. This also causes the strap to bend inside the strap clamping device.
Additional advantages and features of the invention are described in the other claims and in the following description of a specific example of the invention with reference to the attached drawings. It is understood that this example merely serves to illustrate the invention and in no way limits it.
FIG. 1 shows a full view of a specific embodiment of the invention.
FIG. 2 is a cross section of the device shown in FIG. 1.
FIG. 3 represents a top view of the device.
FIG. 4 is a front view with the strap cut.
FIG. 5 shows a top view corresponding to FIG. 3, except that only the clamping part 1 is shown, i.e., with the release device 2 removed.
FI
REFERENCES:
patent: 2604098 (1952-07-01), Kranc
patent: 3349449 (1967-10-01), Hatfield
patent: 4398324 (1983-08-01), Bakker et al.
patent: 4640281 (1987-02-01), Sturm et al.
International Search Report, 2/28/89.
International Preliminary Examination Report, 1/24/90.
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