Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1995-03-16
1997-12-09
Bockelman, Mark
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604 30, 604256, 604258, 128DIG12, 137606, 137860, A61M 500
Patent
active
056954786
DESCRIPTION:
BRIEF SUMMARY
This invention concerns a safety connector of the type characterized in the generic portion of claim 1 for infusion therapy for connecting several infusion lines.
German Patent 4,004,134 A1 discloses a safety connector of the type in question here. It has a casing through which the infusion fluid flows with several passages that can be closed separately and with an outlet for the combined fluid. The passages are bent at an angle and open into a common plane. An elastic sealing element that is essentially angular in cross-section is held with one leg essentially at right angles to the aforementioned plane and with the other leg pressing against the openings to the passages with a spring pressure in the aforementioned plane, thus sealing them. This forms a type of non-return valve for each passage that prevents injection fluid out of one passage from entering the orifice of another passage.
This known safety connector suffers from several disadvantages. First, it has an extremely complicated design. The sealing element which has an angular cross-section must be positioned accurately and with a sealing effect. In addition, it must come in close contact with the surface of the orifice with its sealing leg in the plane where the passages open. Since the contact force here is generated by a pivoting movement of the sealing leg of the sealing element, it is extremely difficult not only to achieve a complete seal around the orifice area of a passage but also to achieve this for all passages. Furthermore, this can be the case only if the contact force is relatively high. But then the opening pressure must also be relatively high. For this reason, this known safety connector is not suitable for gravity infusion systems.
German Utility Patent 7,422,657 discloses a multiple connector for lines for medical equipment with an inside cone at the side for attaching a connecting piece with an outside cone and an elastic length of tubing that is arranged in the area of the connecting piece at the side and in the normal state is in contact with the inside wall of the multiple connector. The inside cone has a diameter such that when inserted in position, the face of the outside cone of the connector forces the length of tubing out of its sealing position into the open position. The length of elastic tubing could also function as a non-return valve and should open temporarily when a high enough injection pressure is created with the help of an injection syringe. Supplying an injection solution presupposes that a high enough pressure can be produced in the injection line. Thus, the use range of this known connector is greatly limited and in any case it is not suitable for gravity infusion equipment. If the connector is also designed as a multiple connector, it must have a complicated design, where several connections for several different infusion lines are provided on a long central length of tubing. This yields a long and complicated design.
This invention is based on the problem of creating a safety connector of the type characterized in the generic portion of claim 1 for infusion therapy for joining several infusion lines, such that it has a simple design and is inexpensive to manufacture, easy to operate and is especially suitable for use with gravity infusion systems.
The problem on which this invention is based is solved by the teaching given in the characterizing part of claim 1.
The basic idea of this invention consists of arranging excess pressure valves for the individual connecting channels in a cylindrical surface. Such a cylindrical surface can essentially be manufactured easily and accurately. For this purpose, the chamber provided between the connecting channels and the outlet channel is bordered by an essentially cylindrical inside wall of the casing. The connecting lines open into this cylindrical inside wall of the casing. The elastic valve body is designed with a ring shape and has a cylindrical outside wall that is in contact with the inside wall of the casing that surrounds the chamber in which the connecti
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Bockelman Mark
Stright Jr. Ronald K.
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