Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1991-09-16
1993-08-10
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604250, 604251, 251 9, A61M 500
Patent
active
052344126
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device which is able to be used in particular as a medical infusion- or transfusion instrument, with a drip chamber, containing a fluid, for a tube lien and with an arrangement for regulating the quantity of fluid flowing through the tube line.
2. Description of Prior Art
In such devices, arrangements are used for regulating the through flow quantity which are suited to alter the through flow cross-section of the tube line in an adjustable manner. Such arrangements are usually applied on the tube line and, as can be seen for example from the DE-OS 2 242 539, are constructed as a so-called roller clamp or bring about the regulation of the through flow cross-section according to a different principle by means of a cam which is able to be adjusted by means of levers, as disclosed for example by the U.S. Pat. No. 4,697,785.
In practical use, however, it has been found that the proper function of the known arrangements is affected by the elasticity of the tube line and its diameter- and wall thickness tolerance. The foregoing has an influence on the constancy of the through flow rate. In addition, it is a disadvantage in the known arrangements that their application on the tube is relatively complicated and time-consuming.
SUMMARY OF THE INVENTION
The object of the invention consists in improving the device indicated in the introduction to the effect that a simplified and easily assembled regulating arrangement is proposed, whereby the through flow rate can be kept constant in a reliable manner independently of the the tube parameters. Furthermore, the manufacturing expenditure for such an arrangement is to be minimized.
This problem is solved according to the invention in that the regulating arrangement is a fixed component of the drip chamber.
A preferred form of an embodiment consists in that the drip chamber is provided on its lower part with a connection piece serving to attach the tube line. Such connection piece is constructed so as to be closed at its front end and is equipped with at least one radial perforation, which in each case opens out into a longitudinal groove. The perforations are towards the front end in the casing surface of the connection piece. The connection piece is surrounded by a tubular threaded pipe provided to receive a regulation nut. The threaded pipe is divided into segments by dividing joints which run axially downwardly. The number of segments corresponds to the the number of longitudinal grooves. The grooves are constructed so as to be made radially elastic. The segments are provided with a regulating knob lying radially opposite a longitudinal groove. Each of these segments is able to be brought into operative connection with an inner taper situated on the regulating nut.
The advantages which are able to be achieved thereby consist in particular in that the regulating arrangement can be manufactured in one piece with the lower part of the drip chamber and preparation can take place simply by pushing the tube line on the tubular connection piece and applying the regulating nut.
Particular sensitivity of adjustment can be achieved in that the thread guiding the regulating nut on the pipe is merely arranged on the casing surface of the segments which are not provided with a regulating knob. Further the longitudinal grooves have a cross-section which widens outwards into a V-shape.
Advantageously, the regulating nut can be made undetachable in that the threaded pipe and/or the regulating nut are provided with means which prevent the unscrewing of the latter, or at least make this difficult.
BRIEF DESCRIPTION OF THE DRAWINGS
The regulating arrangement according to the invention is explained in reference to the embodiment illustrated in the drawing, in which:
FIG. 1 shows a longitudinal section along line I--I through the lower part of a device constructed according to the invention,
FIG. 2 shows a cross-section along line II--II of FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
As can be se
REFERENCES:
patent: 2825333 (1958-03-01), Broman
patent: 3612474 (1971-10-01), Strohl
patent: 3880401 (1975-03-01), Wiltse
patent: 4176683 (1979-12-01), Leibinsohn
patent: 4378013 (1983-03-01), LeFevre
patent: 4609300 (1986-10-01), Robert
patent: 4687176 (1987-08-01), Olsen
Gutowski Anthony
Yasko John D.
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