Surgery – Truss – Pad
Patent
1993-02-18
1994-12-27
Sykes, Angela D.
Surgery
Truss
Pad
A61B 5021
Patent
active
053756053
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In most of the known sphygmomanometers the manometer is contained in a usually cup-shaped case and is mounted therein on one of the parts of the case. This case also contains the dial through which the meter shaft passes. Above the dial the pointer is mounted on the meter shaft. The dial, and the pointer are covered by a crystal which is either inserted directly on the upper margin of the case or is inserted in a separate bezel which in turn is joined to the margin of the case (EP-A-0 008 351 A2). In both cases the disk seals the interior of the case, with the parts contained therein, from the exterior.
If such a sphygmomanometer falls onto a hard surface there is the danger that the case may be damaged, especially that it may be distorted. In the area of the bottom, and of the transition from the bottom to the circumferential wall, the case has of its nature a comparatively great stability of shape, so that in this area the distortions caused by dropping generally remain comparatively slight. It is different when the case strikes in the area of its top margin where the dial and the crystal become damaged. The dial may be bent or may bulge. Such deformation of the dial can be so great that the pointer can no longer move across the dial.
If the case becomes deformed the dial may also snap out of its mounting. The same applies to the crystal. In the event of a particularly hard shock the spiral return spring of the manometer mechanism may become damaged, when for example one or more of its coils loop over one another and become entangled. In the case of all such damage or even destruction of individual parts, the entire sphygmomanometer becomes useless.
SUMMARY OF THE INVENTION
It is the object of the invention to construct a sphygmomanometer such that the damage or destruction caused by dropping it will at least be reduced if not entirely prevented.
Since the primary case is surrounded by a protective case, if the sphygmomanometer falls on a hard surface the circumferential wall of the interior primary case might not be struck, so it cannot be deformed. Consequently the danger that the meter and its parts contained in the primary case might be damaged is almost entirely avoided. In particular, the primary case is prevented from being dented in the area of its upper margin where the dial and crystal are fastened. Therefore these parts are virtually entirely protected against damage. Since the bottom of the protective case is integral, at least at approximately the same level, with the outside of the bottom of the circumferential wall of the primary case, the strength of the entire case is considerably increased in this area. For this reason alone, deformation of the primary case in this area is entirely prevented, and the danger of deformation even of the protective case is greatly diminished.
If the sphygmomanometer is designed in accordance with claim 2, it becomes easier to attach the manometer mechanism to the other parts of the sphygmomanometer which are disposed on the outside of the bottom of the case. In an alternative configuration of the sphygmomanometer according to claim 3, the same will be true for attachment in the area of the side wall of the entire case, if the rest of the parts of the sphygmomanometer are attached there.
In an embodiment of the sphygmomanometer according to claim 4, the guard ring disposed on the upper margin of the protective case closes off the gap between the circumferential wall of the primary case and the circumferential wall of the protective case. This at least greatly reduces, if not entirely prevents, the penetration of dust and dirt into this gap. Also, since the guard ring extends inward at least to the edge of the primary case or extends slightly past it, the upper edge of the primary case with the crystal placed in it and the dial set below it are also protected at the face of the sphygmomanometer.
In a further development of the sphygmomanometer according to claim 5, the danger of damage to the guard ring is reduced since its bev
REFERENCES:
patent: 2560237 (1951-07-01), Miller
patent: 3613667 (1977-10-01), Beck
patent: 3901217 (1975-08-01), Clark
patent: 4010739 (1977-03-01), Leach
patent: 4108310 (1976-03-01), Aldridge et al.
patent: 4222390 (1980-09-01), Berliner et al.
Speidel & Keller GmbH & Co. KG
Sykes Angela D.
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