Filter for infusion and transfusion apparatus
First Claim
1. A filter particularly for transfusion and infusion apparatus, comprising a housing having an inlet passage, a discharge passage, and a single closed continuous spiral flow passage between said inlet passage and said discharge passage, a filtering material located between said spiral passage and said inlet, said outlet passage communicating with the center of said spiral passage.
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Accused Products
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.
47 Citations
16 Claims
- 1. A filter particularly for transfusion and infusion apparatus, comprising a housing having an inlet passage, a discharge passage, and a single closed continuous spiral flow passage between said inlet passage and said discharge passage, a filtering material located between said spiral passage and said inlet, said outlet passage communicating with the center of said spiral passage.
- 4. A filter comprising a housing having first and second housing parts each having a substantially cylindrical shallow depth portion, said first housing part having a surface with a single closed continuous spiral groove defined therein and a central opening, a first flow passage defined in said first housing part communicating with said opening, said second housing part having a cylindrical portion interengaged with said first housing part around the periphery of said spiral passage and a filter disposed between said spiral passage and said second housing part, said second housing part having an inlet passage communicating centrally to the space above said filter.
- 8. An infusion and transfusion apparatus, comprising a flow conduit having a filter housing therein, said filter housing including a large wall surface having a single closed continuous spiral-shape groove passage defined therein with upstanding web portions defined between portions of said passage and including a central opening communicating with said transfusion passage, a filter stretched over said web portions and an inlet passage for the transfusion and infusion material connected to the opposite side of said filter.
- 14. A cannula, comprising a housing having an inlet connection and a discharge connection separated from said inlet connection, said housing including a wall having a single closed continuous spiral grooved passage defined therein located at the separation between said inlet and said outlet connection, a filter extending across said spiral passage, said spiral passage communicating with said discharge connection and the opposite side of said filter communicating with said inlet connection, said discharge connection having a cannula communicating with the discharge passage therein.
Specification