Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1983-10-13
1986-05-20
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604247, 604902, A61M 100
Patent
active
045898693
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION(S)
This U.S. application stems from PCT International Application No. PCT/SE83/00061 filed Feb. 23, 1983.
BACKGROUND OF THE INVENTION TECHNICAL FIELD
The present invention is related to improvement in a suction instrument or the like for one-time use in health care and of the kind comprising a valve for connecting to the suction conduit of the instrument a shunt conduit, communicating with the atmosphere.
STATE OF THE ART
Suction devices of various kind connected to a vacuum pump are used, for instance, in surgery and dental care. One problem arising in this connection is that the nozzle opening may touch body tissues so that these will adhere to the nozzle by suction. Since the vacuum pump continues to evacuate air out of the suction conduit, the pressure will be further reduced and the nozzle will adhere even more firmly. The result will be that tissues may be damaged and the nozzle opening may be blocked by loose objects. This problem may be solved in various ways. One way is to provide the suction conduit with a valve which, when the pressure difference between the atmosphere and the suction conduit exeeds a certain value, will open a flow connection between the suction conduit and the atmosphere. In this manner, the pressure in the suction conduit may never reach below this value, so that the risk of the nozzle adhering by suction will be considerably reduced. Devices of this type are previously known, but these consist of comparatively complicated mechanical devices with a valve member, a valve seat and spring, and are not suited for one-time use, and they are furthermore comparatively complicated to sterilize, since they have to be dismounted, which is a time consuming procedure. Furthermore, it is not always desirable that the valve opens at a certain pre-adjusted subpressure, such as when it is desired to suck up and remove an object.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a simple and inexpensive device which, when in use, will not adhere by suction, or the suction power may be manually controlled in a simple way.
Another object is that the device shall be capable of being manufactured at such a low cost that it can be thrown away after use and may, therefore, consist of only a few parts.
A further object is that the mounting should be simple and, if mounting is necessary, this may be made by machine.
These objects have been attained by a device which comprises at least two parts interconnectable by means of an overlap connection or the like, one of said parts being provided at its end portion with at least one resilient lip projecting from the part, said lip being secured by the other part, after the parts have been interconnected, in a position in which it is situated in the shunt conduit or in abutment with the shunt conduit opening, the lip being adapted to block the passage through the shunt conduit in one direction.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a section along the line I--I in FIG. 2 through the device according to the invention adapted for a connection means for a surgical suction device.
FIG. 2 is a section along the line II--II in FIG. 1.
FIG. 3 is a section analogous to FIG. 1 through a modified embodiment.
FIG. 4 is a section along the line IV--IV in FIG. 3.
FIG. 5 is a longitudinal section through a valve device according to another embodiment and adapted for a connection piece.
FIG. 6 is a section along the line VI--VI in FIG. 5.
FIG. 7 is a section along the line VII--VII in FIG. 5.
FIG. 8 illustrates a fourth embodiment of the invention in section.
FIG. 9 is a section along the line IX--IX in FIG. 8.
FIG. 10 is a section through a suction nozzle according to a further embodiment.
FIG. 11 is a section along the line XI--XI in FIG. 10.
FIG. 12 is a side view of the rear end of the suction nozzle.
FIG. 13 shows the suction hose 12 provided with a lip 16 flanged at an angle smaller than 90.degree. in order to provide a desired spring force when bent into the open groove
REFERENCES:
patent: 2347988 (1944-05-01), Burke
patent: 3419009 (1968-12-01), Ericson
Mediplast AB
Rosenbaum C. Fred
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