Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1983-03-07
1985-08-13
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604181, 604245, 604256, 251354, A61B 1734
Patent
active
045347590
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a valve for supplying, controlling and taking out a medium contained in an implanted container, comprising a valve body wherein a flow channel is provided which widens conically towards the outer side for the introduction of an injection needle and runs into a chamber connected with the container, and in which a closure member acted upon by a reset means is inserted which clears the flow channel when the injection needle is inserted and recloses it when it is taken out.
DESCRIPTION OF THE KNOWN STATE OF THE ART
A valve of this kind has, for example, become known from the Austrian Patent Specification No. 345.438, which describes an implantable container for the long-term administering of medicaments or the like. The valve is a spring valve and as a component part of the container inserted into a bore conically widening towards the outer side. For filling the implanted container the valve is opened when an injection needle is introduced and automatically closed when it is taken out again. As the straight bore extending through the valve housing has to receive not only the closure member but also the reset spring and both members must remain in the bore when the injection needle is introduced, it has proved that the function of the valve does not fulfil the requirements over long periods of time.
It is, therefore, the object of the invention to provide a valve of this kind which is easy to manufacture and whose service life is substantially longer, in which insertion of the injection needle is not impeded by valve members so that no malfunctions occur even after frequent use, as repairs and replacement of the implant should be excluded as far as possible in order to avoid any unnecessary inconvenience to the patients. The valve to be provided in such manner shall, further, not only be an integral component of an implanted container but, in a different design, be insertable into the body as an individual structural member and connectable to the implanted container by means of a pipe.
DESCRIPTION OF THE CHARACTER OF THE INVENTION
According to the invention this problem is solved such that the flow channel comprises an introduction channel for the injection needle in the form of a first pocket bore and a second pocket bore angularly arranged thereto and leading into the introduction channel, which second pocket bore receives the closure member, whereby the closure member projects into the insertion channel in the closed condition.
In the valve according to the invention the flow channel extends to form a corner, whereby the closure member is laterally pressed away by the inserted injection needle and, hence, lifted from the valve seat. Therefore, the reset means is not arranged in the introduction channel and does not impede the insertion of the injection needle, which is inevitable in the long run, when a spring is introduced into the introduction channel.
Even frequent use of the valve does not result in malfunctions caused by the insertion of the injection needle.
In a first embodiment it is provided that the closure member is a solid of revolution whose diameter is smaller than the diameter of the second pocket bore and that the second pocket bore tapers towards the introduction channel, of first pocket bore whereby an O-ring is provided as valve seat which projects radially inwardly from an annular groove of the second pocket bore.
The closure member, which is particularly of spherical shape, projects in a further embodiment preferably from the second pocket bore into the chamber connected with the container, whereby the projecting part is acted upon by an elastic element. The elastic element is preferably a ring, and the valve body is cylindrical at least in the region of the second pocket bore, whereby the ring surrounds the valve body in the cylindrical region and presses on the projecting part of the closure member.
DESCRIPTION OF THE FIGURES OF THE DRAWING
In the following the invention will now be described in more detail in a preferred embodiment by means of the fig
REFERENCES:
patent: 1759798 (1930-05-01), Murphy et al.
patent: 3720220 (1973-03-01), McMath
patent: 3734115 (1973-05-01), McMath
patent: 4181132 (1980-01-01), Parks
patent: 4233982 (1980-11-01), Bauer et al.
patent: 4256102 (1981-03-01), Monaco
patent: 4332255 (1982-06-01), Hakim et al.
Kartchner Gene B.
Rosenbaum C. Fred
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