Abstract: The check valve for infusion and transfusion apparatus comprises a hollow cylindrical member of elastic material which has an open end for the inflow of fluid and an opposite closed end. The hollow cylindrical member has a side wall with an incision in a portion thereof which extends into the hollow interior and provides a flow passage in a direction from the hollow interior outwardly of the cylindrical member. The cylindrical member advantageously has a flange at its entrance end which provides a means for mounting and supporting the valve member. The valve member may be disposed between two connected parts of a housing so that the flange is compressed therebetween and held in position. The construction is usable in a valve housing of a flexible line if the housing includes two interconnected parts which are assembled so as to hold the flange portion of the valve member therebetween.

Abstract: A multitube valve comprises a housing which has open front and rear ends with a plurality of channels defined between the front and rear ends each of a size to receive an individual tube therein and each including a support surface for the tube. A clamp in the form of a rotatable clamp roller has a journal extending outwardly from each side and it is engaged within respective clamp roller grooves which are defined in the housing on each side of the tube channels. The roller is movable by rotation along the grooves toward either the front or rear ends of the housing and it is of a size such that it cooperates with the support surface to compress the tubes therebetween and to at least partially close off the tubes when it is aligned over the support surface. The support surfaces are offset from each other in the longitudinal direction of the channels so that they operate at a separate time in respect to the positioning of the clamp for closing off the tube flow.

Abstract: A multitube valve comprises a housing which has open front and rear ends with a plurality of channels defined between the front and rear ends each of a size to receive an individual tube therein and each including a support surface for the tube. A clamp in the form of a rotatable clamp roller has a journal extending outwardly from each side and it is engaged within respective clamp roller grooves which are defined in the housing on each side of the tube channels. The roller is movable by rotation along the grooves toward either the front or rear ends of the housing and it is of a size such that it cooperates with the support surface to compress the tubes therebetween and to at least partially close off the tubes when it is aligned over the support surface. The support surfaces are offset from each other in the longitudinal direction of the channels so that they operate at a separate time in respect to the positioning of the clamp for closing off the tube flow.

Abstract: A filter particularly for infusion and transfusion apparatus, comprises a housing having an inlet passage and a discharge passage spaced from the inlet passage. The housing includes a surface with a spiral flow passage defined thereon which is centrally communicated to the discharge passage. A filtering material is placed over the spiral in the housing which is made up of two parts which are interconnectable at the location of the spiral and which also act to hold the filter material in position. In an alternate embodiment, the housing of the filter is formed as a portion of a cannula. The inlet and outlet flow passages of the housing may be arranged to align axially, for example, on one side of the housing, or they may be offset.

Abstract: A piercing cannula of infusion and transfusion instruments, includes a housing having a lower liquid chamber defined therein and having an upper closure with an air opening on one side. A liquid member communicating with the interior of the housing extends outwardly through the closure directly alongside an aeration channel which has a lower end communicating with the opening. The housing includes a tubular portion defining an air inlet passage from the opening to the lower end of the aeration channel and a valve member is disposed between the liquid chamber and the lower end of the open aeration channel. The valve member comprises an upper inwardly tapered portion which is resiliently biased against the end of the tubular part defining the air passage.