Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1989-09-25
1991-12-17
Shay, Randy C.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604119, A61M 100
Patent
active
050731726
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for aspirating fluids from wounds, in particular to parts on and for such devices. Such devices and parts thereof are used in the drainage of wounds. For this purpose, a pre-evacuated suction bottle preferably equipped with a vacuum indicator is connected via a connecting tube with a perforated drainage tube which is inserted in the cavity of the wound, the latter being sealed airtight.
PRIOR ART
Suction bottles, as a rule, are adjusted by the manufacturer to about five to ten percent of the normal air pressure, and typically have a holding capacity of 150 to 1000 ml. The internal pressure is indicated via a vacuum indicator. If the suction force is to be low, the bottle, which has been evacuated to a relatively high degree by the manufacturer, is partly aerated before it is connected to the connecting hose.
If the bottle, when in use, fills with secretion, the pressure of the air in the residual volume rises gradually according to Boyle-Mariotte's rule. At a starting pressure in the empty bottle of five percent of the atmospheric pressure, the pressure difference between the inside and outside comes to 95 percent of the atmospheric pressure. If the bottle fills halfway, its inside pressure doubles, so that the pressure difference comes to 90 percent of the atmospheric pressure. With a bottle filled to 75 percent of its capacity, the pressure difference between the inside and outside still comes to 80 percent of the atmospheric pressure. This calculation is an approximation that does not take into account the vapor pressure of the secretion, which, however, is low as compared to the air pressure. From the empty bottle to the bottle three-quarters full of secretion, the suction of the system is thus quite even, which is important for the efficiency. However, the range of a uniform suction effect becomes considerably poorer if the bottle, which is empty with respect to secretion, has been partly aerated in order to obtain a low suction effect. In addition to this shortcoming, the bottle partly aerated by the user has the drawback that there is the risk of contamination. Therefore, manufacturers also supply suction bottles with an inside pressure corresponding to about 50 percent of the atmospheric pressure.
It is deemed desirable not only that the inside pressure can be adjusted and maintained as constant as possible, but also that the pressure can be read as accurately as possible. Various solutions have become known for these purposes. Most frequently used is a plastic bellows, which is mounted on the suction bottle and operates in a transparent hollow cylinder with a scale. It has been found, however, that the reading accuracy of the bellows is insufficient. Hence indicators with mechanical springs have been proposed as well. Such an indicator is known from DE-C2-30 11 163.
As stated above, the device according to the invention is used in association with a pre-evacuated suction bottle, which is connected with a perforated wound draining tube via a connecting tube.
The connecting device normally used is a simple tube, of which the one end is connected to a connection fitting on the suction bottle, and the other end is connected to a connection fitting on the wound draining tube. A clamping device is used for interrupting this system, i.e., for closing off the tube.
When a perforated wound draining tube is connected with a suction bottle by way of a connecting tube and the passage through the latter is opened by releasing the mentioned clamping device, the full vacuum of the preevacuated suction bottle is applied to the cavity of the wound. So that the suction is not too strong especially with fresh wounds, the manufacturers of suction bottles supply bottles which are already partly aerated. Their suction effect, however, falls off quickly once they fill with secretion.
Therefore, it is deemed desirable within the framework of the invention to propose a connection system that permits superior handling than the familiar connecting tube.
SUM
REFERENCES:
patent: 3624821 (1971-11-01), Henderson
patent: 3946770 (1976-03-01), Trinne et al.
patent: 4112949 (1978-09-01), Rosenthal et al.
patent: 4372336 (1983-02-01), Cornell et al.
Gualtieri G.
MEDINORM Aktiengesellschaft medizintechnische Produkte
Shay Randy C.
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