EP0223451B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improvements in or relating to devices for sampling, drainage or infusion of liquids from or to the human or animal body
Assignee: Pharmacia Ltd
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Filing: 1986-10-28
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Granted: 1991-04-17
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Expires: 2006-10-28
Abstract
Abstract A device for use in the sampling or infusion of liquids from or to the human or animal body, comprising a chamber for receiving fluid, a cannula in communication with the chamber, at least one valve means operable in an open condition to connect the chamber with a source or drain of liquid and in a closed condition to seal the chamber therefrom, and chamber venting means allowing the escape of air from the chamber while preventing the escape of liquid therefrom.
Inventors
- 👤 Jeffrey Alan Cox
- 👤 Liakatali G. H. Parapia
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 14:51
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/158; A61M39/00; A61M39/02; A61M39/06; A61M39/0693
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
191 words
Apparatus for use in the sampling or infusion of liquids from or to the human or animal body comprising a device defining a chamber (1) for receiving fluid, a cannula (2) in communication with the chamber (1), valve means (3) comprising an elastomeric membrane having a central puncture (4) operable in an open condition to connect the chamber (1) with a source or drain of liquid and in a closed condition to seal the chamber (1) therefrom, a ducted member (9) having a distal end for use in penetrating the membrane at the puncture site (4) to provide a flow path through the membrane in an open condition of the valve means (3), the membrane being self-sealing on withdrawal of the member (9) in a closed condition of the valve means (3), characterised in that the device comprises coupling means provided at the proximal end portion of the ducted member for connection to a catheter in communication with the source or drain of liquid; and in that the device further comprises chamber venting means (5) allowing the escape of air from the chamber (1) whilst preventing the escape of liquid therefrom.
Claim 2
Dependent Claim
38 words
Apparatus as claimed in Claim 1 wherein the venting means (5) is a hydrophobic filter comprising an air permeable barrier of a hydrophobic material, preferably polytetrafluoroethylene having a pore size in the range of 0.2 to 0.5 micron.
Claim 3
Dependent Claim
41 words
Apparatus as claimed in Claim 1 or Claim 2 wherein the valve means (3) is disposed in a position and orientation permitting an elongate member penetrating the valve means (3) to extend linearly through the chamber (1) and the cannula (2).
Claim 4
Dependent Claim
56 words
Apparatus as claimed in Claim 3 wherein the cannula (2) communicates with one end of the chamber (1), the valve means (3) is disposed at the opposite end of the chamber for admitting an elongate member and a second valve means (19) is disposed at an intermediate position in a side port (18) of the chamber.
Claim 5
Dependent Claim
73 words
Apparatus as claimed in Claim 3 or Claim 4 wherein the cannula (2) communicates with one end of the chamber (1) and the venting means (5) is disposed at or adjacent to the opposite end of the chamber so that, in use, the venting means (5) is disposed as far away as possible from the body and so that, in use, the venting means releases air from the uppermost portion of the chamber.
Claim 6
Dependent Claim
31 words
Apparatus as claimed in any preceding claim in which the outer surface of the membrane with respect to the chamber lies substantially flush with the surrounding outer surface of the device.
Claim 7
Dependent Claim
35 words
Apparatus as claimed in any preceding claim wherein the ducted member constitutes an adaptor (8) which includes means (10) for fastening the ducted member to the device in the open condition of the valve means.
Claim 8
Dependent Claim
21 words
Apparatus as claimed in any preceding claim wherein the membrane is made from an uncured rubber material or from silicone rubber.
References Cited (Backward Citations)
DE2920975A1
Cited
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