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Anaesthetic vaporizer with expandable/contractable reservoir for pumping liquid anaesthetic

  • US 5,645,052 A
  • Filed: 01/16/1996
  • Issued: 07/08/1997
  • Est. Priority Date: 04/26/1991
  • Status: Expired due to Term
First Claim
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1. An anaesthetic vaporizer which comprises an inlet for receiving a carrier gas, an outlet for discharging carrier gas and anaesthetic agent, and a vaporizing chamber intermediate the inlet and the outlet wherein liquid anaesthetic agent is vaporized into the stream of carrier gas, the improvement comprising a pump for delivering a quantity of an anaesthetic agent into said vaporizing chamber, said pump comprising:

  • (a) a chamber having an inlet port for connection to a supply of liquid anaesthetic, a reservoir port and an outlet port fluidly connected to said vaporizing chamber;

    (b) a valve member which can be moved between a first position in which the anaesthetic agent can flow from the supply of liquid anaesthetic through the chamber between the inlet port and the reservoir port, and a second position in which the agent can flow through the chamber between the reservoir port and the outlet port;

    (c) a reservoir connected to the reservoir port in which the agent can be retained prior to delivery, the reservoir being defined by a flexible, expandable body;

    (d) a drive unit connected to said reservoir body to expand said reservoir body to draw liquid anaesthetic from the supply of liquid anaesthetic through said valve member or to contract said reservoir body to force anaesthetic agent from said reservoir through said valve member to said vaporizing chamber; and

    (e) a control unit controlling said drive unit to expand said reservoir body at an independently selected rate to draw a predetermined amount of the liquid anaesthetic and to contract said reservoir body at an independently selected rate to force a predetermined quantity of liquid anaesthetic to said vaporizing chamber.

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