US3721238A — Disposable anesthesia device

Claim 1

Independent Claim 299 words

An anesthesia device for administering anesthetic gas, having inhalation and exhalation hoses connected to a face mask and attachable to a canister containing granular material capable of absorbing carbon dioxide gas, characterized in that said canister comprises: A. a hollow upright container; B. a partition in said hollow container dividing the same into two laterally adjacent compartments connected with one another only at the bottom of the hollow container; C. a cover sealingly closing the top of the hollow container and having a groove in its underside to sealingly receive the upper edge portion of the partition; D. a pair of hollow protuberances integral with said cover and rising therefrom, one over each of said compartments and having its interior connected therewith; E. tubular coupling means fixed to and projecting laterally from one side of each protuberance and opening to its interior; each said coupling means having a coupling tube which provides for attachment of one of said hoses to the canister; each said coupling tube being telescoped into and fixed within an adjoining tubular portion of its coupling means; F. an annular shoulder on each tubular portion axially opposing the end of the tube therein; and G. a check valve in said tubular portion of the coupling means on each protuberance, said check valve comprising a single thin pliable disc having an annular peripheral rim portion which is clamped between the shoulder in said tubular portion and the adjacent end of the coupling tube, and a central flap which is integrally joined to said peripheral rim portion at a localized zone of the latter, the check valve associated with one of said protuberances opening away from the same to serve the inhalation hose, and the other check valve opening towards the other protuberance to serve the exhalation hose.

Claim 2

Dependent Claim 299 words

An anesthesia device for administering anesthetic gas, having inhalation and exhalation hoses connected to a face mask and attachable to a canister containing granular material capable of absorbing carbon dioxide gas, characterized in that said canister comprises: A. a hollow upright container; B. a partition in said hollow container dividing the same into two laterally adjacent compartments connected with one another only at the bottom of the hollow container; C. a cover sealingly closing the top of the hollow container and having a groove in its underside to sealingly receive the upper edge portion of the partition; D. a pair of hollow protuberances integral with said cover and rising therefrom, one over each of said compartments and having its interior connected therewith; E. tubular coupling means fixed to and projecting laterally from one side of each protuberance and opening to its interior; each said coupling means having a coupling tube which provides for attachment of one of said hoses to the canister; each said coupling tube being telescoped into and fixed within an adjoining tubular portion of its coupling means; F. an annular shoulder on each tubular portion axially opposing the end of the tube therein; and G. a check valve in said tubular portion of the coupling means on each protuberance, said check valve comprising a single thin pliable disc having an annular peripheral rim portion which is clamped between the shoulder in said tubular portion and the adjacent end of the coupling tube, and a central flap which is integrally joined to said peripheral rim portion at a localized zone of the latter, the check valve associated with one of said protuberances opening away from the same to serve the inhalation hose, and the other check valve opening towards the other protuberance to serve the exhalation hose.

Claim 3

Dependent Claim 39 words

The anesthesia device of claim 1, further characterized in that the canister body, the partition therein, the cover with its hollow protuberances, and the coupling means are molded plastic parts so that the entire anesthesia device is economically disposable.

Claim 4

Dependent Claim 25 words

a valve cage fixed with respect to said wall and encircling said valve seat, the interior of the cage having open communication with the atmosphere,

Claim 5

Dependent Claim 25 words

a valve cage fixed with respect to said wall and encircling said valve seat, the interior of the cage having open communication with the atmosphere,

Claim 6

Dependent Claim 3 words

a face mask,

Claim 7

Dependent Claim 3 words

a face mask,

Claim 8

Dependent Claim 53 words

a light-weight disc loosely received in said cage and freely movable to and from a closed position seated upon said valve seat to close said hole and prevent ingress of air into the closed circuit while being freely movable off of the valve seat by very slight positive pressure in the closed circuit,

Claim 9

Dependent Claim 53 words

a light-weight disc loosely received in said cage and freely movable to and from a closed position seated upon said valve seat to close said hole and prevent ingress of air into the closed circuit while being freely movable off of the valve seat by very slight positive pressure in the closed circuit,

Claim 10

Dependent Claim 10 words

flexible inhalation and exhalation tubes connected with the face mask,

Claim 11

Dependent Claim 10 words

flexible inhalation and exhalation tubes connected with the face mask,

Claim 12

Dependent Claim 86 words

The anesthesia device of claim 1, further characterized by: A. the shoulder in the coupling means on said one protuberance provides a valve seat which is engageable by the flap of the associated check valve upon motion of said flap toward said one protuberance; B. and the end of the tube in the coupling means on the other of said protuberances provides a valve seat which is engageable by the flap of the other check valve upon motion of said flap away from said other protuberance.

Claim 13

Dependent Claim 34 words

The anesthesia device of claim 1, wherein the coupling means on one of said protuberances has a tubular side outlet which projects therefrom and provides for attachment of a rebreathing bag to the canister.

Claim 14

Dependent Claim 168 words

and tubular coupling members connecting said tubes with the inlet and outlet ports of the canister so that the canister, face mask, and the flexible tubes form a closed circuit, said device being characterized by: A. flap-type inhalation and exhalation valves controlling air flow through said closed circuit, each of said valves comprising a circular disc of thin pliable sheet material arcuately slit a short distance in from its periphery to define a circular flap encircled by and having a narrow localized highly flexible hinge connection with an uninterrupted annular rim portion; B. means mounting said valves in the tubular coupling members, comprising opposing annular shoulders in said coupling members between which the annular rim portion is clamped, the downstream shoulder in each instance being no wider than the annular rim portion of the valve disc but the upstream shoulder being wider so as to form a seat for the hinged flap; and C. an adjustable pressure relief valve for controlling the pressure in said closed circuit, comprising

Claim 15

Dependent Claim 168 words

and tubular coupling members connecting said tubes with the inlet and outlet ports of the canister so that the canister, face mask, and the flexible tubes form a closed circuit, said device being characterized by: A. flap-type inhalation and exhalation valves controlling air flow through said closed circuit, each of said valves comprising a circular disc of thin pliable sheet material arcuately slit a short distance in from its periphery to define a circular flap encircled by and having a narrow localized highly flexible hinge connection with an uninterrupted annular rim portion; B. means mounting said valves in the tubular coupling members, comprising opposing annular shoulders in said coupling members between which the annular rim portion is clamped, the downstream shoulder in each instance being no wider than the annular rim portion of the valve disc but the upstream shoulder being wider so as to form a seat for the hinged flap; and C. an adjustable pressure relief valve for controlling the pressure in said closed circuit, comprising

Claim 16

Dependent Claim 21 words

said valve disc comprising a cylindrical body of foam plastic having opposite flat faces covered by thin plastic non-adherent film material,

Claim 17

Dependent Claim 21 words

said valve disc comprising a cylindrical body of foam plastic having opposite flat faces covered by thin plastic non-adherent film material,

Claim 18

Dependent Claim 29 words

and a cap adjustably mounted on said valve cage and having an abutment to engage and limit the extent the valve disc may be lifted off the valve seat.

Claim 19

Dependent Claim 29 words

and a cap adjustably mounted on said valve cage and having an abutment to engage and limit the extent the valve disc may be lifted off the valve seat.

Claim 20

Dependent Claim 63 words

The anesthesia device of claim 4, further characterized by: A. said side outlet being on that coupling means having the inhalation check valve which opens away from its associated protuberance; B. and said last named protuberance having tubular means thereon which projects from another side thereof and provides an inlet for fresh gas which may be fed thereto from an anesthesia gas machine.

Claim 21

Dependent Claim 17 words

The anesthesia device of claim 1, wherein a pressure relief valve is mounted in said other protuberance.

Claim 22

Dependent Claim 40 words

The anesthesia device of claim 6, wherein said pressure relief valve which is mounted in said other protuberance has a cap at the top thereof which provides a readily accessible adjusting means for varying the relief setting of the valve.

Claim 23

Dependent Claim 124 words

The anesthesia device of claim 6, wherein said pressure relief valve comprises: A. an annular valve seat on the top wall of said other protuberance; B. a valve cage fixed with respect to the top wall of said other protuberance and encircling the valve seat, the interior of said cage having open communication with the atmosphere; C. a cap adjustably mounted on and covering the top of said valve cage; D. and a light-weight valve disc held in the cage by said cap, and movable over said seat to and from a closed position engaging the same to prevent ingress of air into the canister while being freely movable off of its seat by very slight positive pressure exerted thereon from under the seat.

Claim 24

Dependent Claim 27 words

The anesthesia device of claim 8, wherein said valve disc comprises a cylindrical body of foam plastic having opposite flat faces covered by thin plastic non-adherent film.

Claim 25

Dependent Claim 160 words

The anesthesia device of claim 1, further characterized by the provision of an adjust-able pressure relief valve comprising: A. a valve seat encircling a hole in a top portion of the hollow upright container and opening to one of said compartments; B. a valve cage fixed with respect to said top portion of the hollow upright container and encircling the valve seat, the interior of said cage having open communication with the atmosphere; C. a light-weight valve disc loosely received in said cage and freely movable to and from a closed position seated upon the valve seat to close said hole and prevent ingress of air into said one compartment while being free to move off of its seat in response to very slight positive pressure in said one compartment; D. and a cap adjustably mounted on said valve cage and having means thereon to engage and limit the extent the valve disc may be lifted off of its seat.

Claim 26

Dependent Claim 52 words

The anesthesia device of claim 1, further characterized by: A. said granular material filling said compartments to a level below the top edge of the partition; and B. perforated cover means covering the top of each compartment and engaging the surface of the granular material therein to confine the same against displacement.

Claim 27

Dependent Claim 36 words

The anesthesia device of claim 11, further characterized by downwardly projecting spacers on the underside of the cover bearing upon said perforated cover means to hold the lAtter down on the granular material in the compartments.

Claim 28

Dependent Claim 228 words

The anesthesia device of claim 1, further characterized in that it is of the closed circuit type and has a pressure relief valve comprising: a wall defining part of the closed circuit of the anesthesia device, said wall having a hole encircled by a valve seat; a valve cage member projecting from said wall and encircling said valve seat; said valve cage member being externally threaded; a light-weight valve disc in the valve cage member to engage said valve seat and close the hole against ingress of air into the closed circuit while being free to leave the valve seat to relieve pressure in the closed circuit; a cap member threaded onto the hollow valve cage member, said cap member having an end wall and a cylindrical internally threaded skirt depending therefrom to fit the threads on the valve cage member, and the cap member also having a central stem depending from its end wall to be engageable with the valve disc and limit displacement thereof off its seat to an amount dependent upon the extent the cap member is threaded onto the valve cage member; and one of said members having an opening through which the interior of the valve cage member is at all times open to the atmosphere, all of said structure with the exception of the light weight valve disc being molded plastic parts.

Claim 29

Dependent Claim 31 words

The pressure relief valve of claim 13, wherein the valve disc is a piece of foam plastic with flat opposite faces covered with a thin pliable veneer of plastic sheet material.

Claim 30

Dependent Claim 17 words

An anesthesia device for administering anesthetic gas from a source thereof to a patient, which device comprises

Claim 31

Dependent Claim 17 words

An anesthesia device for administering anesthetic gas from a source thereof to a patient, which device comprises

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-03-19	1976-09-18	1977-03-20	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-03-19	1980-09-18	1981-03-20	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-03-19	1984-09-18	1985-03-20	$7700.00	Window Closed / Lapsed

Disposable anesthesia device

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