US4770168A — Electrically controllable anesthesia vaporizer

Claim 1

Independent Claim 224 words

An electrically controllable anesthesia vaporizer for introducing vapor at a controllable rate into a carrier gas stream flowing therethrough comprising: (a) a main closed container with an outer wall, said container having in a portion thereof a reservoir for holding a liquid anesthetic, having a chamber means above said reservoir for collecting and containing anesthetic vapor from said liquid anesthetic, and having spaced apart inlet and outlet ports extending through separate portions respectively of said container wall, said inlet port being adapted for connection to a source of a carrier gas; (b) a conduit having a source end adapted for connection to another a source of a carrier gas, having a load end adapted for connection to a patient's breathing-system, and having a distal port located in said wall of said conduit near said load end; (c) an electric-motor-driven pump assembly comprising a positive displacement pump having an inlet side and an outlet side; and an electric motor mechanically connected to said pump; and (d) an outlet connection for connecting said pump between said container outlet port and said distal port of said conduit to introduce the anesthetic vapor into the carrier gas stream flowing in said conduit, when an electrical energizing signal is applied to said motor, and at a rate that is directly related to a parameter of the electrical energizing signal.

Claim 2

Dependent Claim 224 words

An electrically controllable anesthesia vaporizer for introducing vapor at a controllable rate into a carrier gas stream flowing therethrough comprising: (a) a main closed container with an outer wall, said container having in a portion thereof a reservoir for holding a liquid anesthetic, having a chamber means above said reservoir for collecting and containing anesthetic vapor from said liquid anesthetic, and having spaced apart inlet and outlet ports extending through separate portions respectively of said container wall, said inlet port being adapted for connection to a source of a carrier gas; (b) a conduit having a source end adapted for connection to another a source of a carrier gas, having a load end adapted for connection to a patient's breathing-system, and having a distal port located in said wall of said conduit near said load end; (c) an electric-motor-driven pump assembly comprising a positive displacement pump having an inlet side and an outlet side; and an electric motor mechanically connected to said pump; and (d) an outlet connection for connecting said pump between said container outlet port and said distal port of said conduit to introduce the anesthetic vapor into the carrier gas stream flowing in said conduit, when an electrical energizing signal is applied to said motor, and at a rate that is directly related to a parameter of the electrical energizing signal.

Claim 3

Dependent Claim 58 words

The vaporizer of claim 1 wherein said connection between said pump and said distal port is short and has a small gas capacity of less than 10 ml to prevent this connection from acting as a large reservoir of anesthetic vapor that can discharge abruptly into the patient's breathing system at the beginning of each inspiratory breathing period.

Claim 4

Dependent Claim 32 words

The vaporizer of claim 1 wherein said motor is a DC motor of the kind having a speed that is directly related to the DC amplitude parameter of the applied energizing signal.

Claim 5

Dependent Claim 40 words

The vaporizer of claim 1 wherein said motor is a stepping motor of the kind having a rotor that rotates through an angle that is directly proportional to the number of AC pulses parameter of the appied electrical energizing signal.

Claim 6

Dependent Claim 35 words

The vaporizer of claim 1 wherein said closed container additionally has a wick one end of which is submersed in said liquid anesthetic and the other end of which extends upwardly into said chamber means.

Claim 7

Dependent Claim 73 words

The vaporizer of claim 1 additionally comprising a wick means in said reservoir wherein said wick means is for extending into said container to serve as a barrier in said chamber means and to divide said chamber means into two compartments above said reservoir, said inlet port being in an outer wall of a first of said compartments and said outlet port being in an outer wall of the second of said compartments.

Claim 8

Dependent Claim 160 words

The vaporizer of claim 1 additionally comprising at least another closed container having a liquid anesthetic reservoir, and inlet and outlet ports; a first multi-position valve connected to said inlet port of said main container and to said inlet port of said another container, adapted for when in position A connecting said inlet port of said main container to a source of carrier gas and when in position B connecting said inlet port of a source of carrier gas; and a second multi-position valve connected to said outlet port of said main container, to said pump and to the outlet port of said another container, for when in position A connecting said outlet port of said main container to said pump and when in position B connecting the outlet port of said another container to said inlet side of said pump, and said multi-position valves being ganged so that both are in positions A or are both in positions B.

Claim 9

Dependent Claim 161 words

In an anesthesia vaporizer of the kind including a conduit adapted for connecting a source of a carrier gas to the breathing system of a patient, said conduit having a port in a side wall thereof through which anesthetic vapor may be introduced, and including a main closed containing means for holding a quantity of a liquid anesthetic, for vaporizing the anesthetic, for admitting a carrier gas to mix with the anesthetic vapor, and for maintaining the condition of anesthetic vapor saturation in the admitted carrier gas, the improvement comprising: an electric-motor-driven pump assembly, including a motor and a positive displacement pump mechanically connected to said motor, said pump being connected between said containing means and said port in said conduit for conveying, when an electrical energizing signal is applied to said motor, the anesthetic vapor saturated carrier gas from said containing means to said conduit at a rate that is directly related to a parameter of the electrical energizing signal.

Claim 10

Dependent Claim 161 words

In an anesthesia vaporizer of the kind including a conduit adapted for connecting a source of a carrier gas to the breathing system of a patient, said conduit having a port in a side wall thereof through which anesthetic vapor may be introduced, and including a main closed containing means for holding a quantity of a liquid anesthetic, for vaporizing the anesthetic, for admitting a carrier gas to mix with the anesthetic vapor, and for maintaining the condition of anesthetic vapor saturation in the admitted carrier gas, the improvement comprising: an electric-motor-driven pump assembly, including a motor and a positive displacement pump mechanically connected to said motor, said pump being connected between said containing means and said port in said conduit for conveying, when an electrical energizing signal is applied to said motor, the anesthetic vapor saturated carrier gas from said containing means to said conduit at a rate that is directly related to a parameter of the electrical energizing signal.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1991-09-13	1992-03-14	1992-09-13	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1995-09-13	1996-03-14	1996-09-13	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1999-09-13	2000-03-14	2000-09-13	$7700.00	Window Closed / Lapsed

Electrically controllable anesthesia vaporizer

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag