US3556095A — Automatic intermittent positive pressure ventilat…

Claim 1

Independent Claim 253 words

A mechanical ventilator comprising: a. a variable volume ventilating gas reservoir; b. pneumatic circuitry for driving from an external driving source said reservoir; c. patient circuitry leading from said reservoir to the patient; d. a valve for controlling within said pneumatic circuitry the direction of flow of said external driving source; e. a pilot responsive to pressure variation and capable of switching said valve when a pressure variation occurs; f. a first valve for actuating said pilot to cause said reservoir to expand; g. a second valve for actuating said pilot to cause said reservoir to expand; h. a third valve for actuating said pilot to cause said reservoir to contract; i. a fourth valve for actuating said pilot to cause said reservoir to contract; j. a first actuating means for actuating said first valve wherein said first actuating means is responsive to the volume of said reservoir; k. a second actuating means for actuating said second valve wherein said second actuating means is responsive to the pressure within the respiratory system of the patient; l. a third actuating means for actuating said third valve wherein said third actuating means is responsive to the volume of said reservoir; and m. a fourth actuating means connected in said patient circuitry for actuating said fourth valve including an aneroid assembly and an operator connected to said aneroid assembly for coaction with said fourth valve, whereby upon actuation of said fourth valve the ventilator assists the patient in breathing responsive to self-initiated inhalation of the patient.

Claim 2

Dependent Claim 253 words

A mechanical ventilator comprising: a. a variable volume ventilating gas reservoir; b. pneumatic circuitry for driving from an external driving source said reservoir; c. patient circuitry leading from said reservoir to the patient; d. a valve for controlling within said pneumatic circuitry the direction of flow of said external driving source; e. a pilot responsive to pressure variation and capable of switching said valve when a pressure variation occurs; f. a first valve for actuating said pilot to cause said reservoir to expand; g. a second valve for actuating said pilot to cause said reservoir to expand; h. a third valve for actuating said pilot to cause said reservoir to contract; i. a fourth valve for actuating said pilot to cause said reservoir to contract; j. a first actuating means for actuating said first valve wherein said first actuating means is responsive to the volume of said reservoir; k. a second actuating means for actuating said second valve wherein said second actuating means is responsive to the pressure within the respiratory system of the patient; l. a third actuating means for actuating said third valve wherein said third actuating means is responsive to the volume of said reservoir; and m. a fourth actuating means connected in said patient circuitry for actuating said fourth valve including an aneroid assembly and an operator connected to said aneroid assembly for coaction with said fourth valve, whereby upon actuation of said fourth valve the ventilator assists the patient in breathing responsive to self-initiated inhalation of the patient.

Claim 3

Dependent Claim 30 words

The mechanical ventilator as described in claim 1 wherein said fourth actuating means is isolated from the patient''s breathing cycles until said variable volume ventilating gas reservoir is fully extended.

Claim 4

Dependent Claim 24 words

The mechanical ventilator as described in claim 2 wherein the third actuating means provides for a variable time delay before actuating said third valve.

Claim 5

Dependent Claim 32 words

The mechanical ventilator as described in claim 3 wherein the variable time delay created by said third actuating means is directly proportional to the stroke of said variable volume ventilating gas reservoir.

Claim 6

Dependent Claim 229 words

The mechanical ventilator as described in claim 3 wherein the means for achieving said time delay before said third actuating means actuates said third valve comprises: a. a first delay circuit emanating from said pneumatic circuitry; b. a control valve within said first delay circuit to control the rate of flow of the ventilator''s driving means; c. a three-way valve, one of whose ports is attached to said first delay circuit; d. a second delay circuit emanating from a second port in said three-way valve; e. an orifice attached to the third port of said three-way valve, said orifice offering a resistance to the passage of air; f. a timing cylinder into which said second delay circuit feeds; g. a first bar affixed to the movable end of said reservoir and aligned to actuate said three-way valve whereby the connection of said second delay circuit to said orifice with said first delay circuit sealed is switched to the connection of said second delay circuit to said first delay circuit with said orifice sealed; h. a timing piston-cylinder arrangement responsive to the setting of said control valve and to the setting of said three-way valve; and i. a second bar affixed to said piston and aligned with said second valve so as to actuate said second valve when said piston is driven a predetermined distance out of said timing cylinder.

Claim 7

Dependent Claim 52 words

The mechanical ventilator as described in claim 5 wherein the resistance offered by said orifice to the passage of air is sufficient to prevent without the application of an external force said timing piston from moving into said timing cylinder when said three-way valve connects said second delay circuit to said orifice.

Claim 8

Dependent Claim 204 words

A mechanical ventilator comprising: a. a variable volume reservoir; b. a piston-cylinder arrangement for driving said reservoir; c. a four-way valve for controlling the flow of the ventilator''s driving means to said piston-cylinder arrangement; d. a pilot which controls the setting of said four-way valve; e. circuitry to carry the ventilator''s driving means connecting said four-way valve with said piston-cylinder arrangement and arranged so as to cause the piston in said piston-cylinder arrangement to reciprocate within the cylinder; f. patient circuitry leading from said reservoir to the patient; g. a spill valve connecting said reservoir to the atmosphere; h. a first valve capable of causing said pilot to switch said four-way valve thus reversing the movement of said reservoir; i. structural means attached to said reservoir so as to actuate said first valve when said reservoir has been collapsed; j. a second valve capable of causing said pilot to switch said four-way valve thus reversing the movement of said reservoir; k. delay means capable of creating a delay in time between when said reservoir becomes fully extended and when said second valve is actuated; and l. means for making said delay means directly proportional to the length of stroke of said variable volume reservoir.

Claim 9

Dependent Claim 204 words

A mechanical ventilator comprising: a. a variable volume reservoir; b. a piston-cylinder arrangement for driving said reservoir; c. a four-way valve for controlling the flow of the ventilator''s driving means to said piston-cylinder arrangement; d. a pilot which controls the setting of said four-way valve; e. circuitry to carry the ventilator''s driving means connecting said four-way valve with said piston-cylinder arrangement and arranged so as to cause the piston in said piston-cylinder arrangement to reciprocate within the cylinder; f. patient circuitry leading from said reservoir to the patient; g. a spill valve connecting said reservoir to the atmosphere; h. a first valve capable of causing said pilot to switch said four-way valve thus reversing the movement of said reservoir; i. structural means attached to said reservoir so as to actuate said first valve when said reservoir has been collapsed; j. a second valve capable of causing said pilot to switch said four-way valve thus reversing the movement of said reservoir; k. delay means capable of creating a delay in time between when said reservoir becomes fully extended and when said second valve is actuated; and l. means for making said delay means directly proportional to the length of stroke of said variable volume reservoir.

Claim 10

Dependent Claim 23 words

The mechanical ventilator as described in claim 7 wherein said delay means can be varied to achieve any number of predetermined time delays.

Claim 11

Dependent Claim 249 words

The mechanical ventilator as described in claim 8 wherein said delay means for creating a delay in time between when said reservoir becomes fully extended and when said second valve is actuated comprises: a. a first delay circuit emanating from said ventilator''s circuitry; b. a control valve within said first delay circuit to control the rate of flow of the ventilator''s driving means; c. a three-way valve, one of whose ports is attached to said first delay circuit; d. a second delay circuit emanating from a second port in said three-way valve; e. an orifice attached to the third port of said three-way valve, said orifice offering a resistance to the passage of air; f. a timing cylinder into which said second delay circuitry feeds; g. A first bar affixed to the movable end of said reservoir and aligned to actuate said three-way valve whereby the connection of said second delay circuit to said orifice with said first delay circuit sealed is switched to the connection of said second delay circuit to said first delay circuit with said orifice sealed; h. a timing piston-cylinder arrangement in which said timing piston reciprocates within said timing cylinder and dependent upon the setting of said control valve and upon the setting of said three-way valve; and i. a second bar affixed to said timing piston and aligned with said second valve so as to actuate said second valve when said timing piston is dRiven a predetermined distance out of said timing cylinder.

Claim 12

Dependent Claim 81 words

The mechanical ventilator as described in claim 8 wherein said means for making said delay means directly proportional to the length of stroke of said variable volume reservoir comprises a third bar affixed to the movable end of said variable volume reservoir and aligned so as to apply a force which will overcome the resistance of said orifice and force the movement of said timing piston into said timing cylinder a distance equal to the amount of collapse of said reservoir.

Claim 13

Dependent Claim 52 words

The mechanical ventilator as described in claim 10 wherein said pilot is additionally responsive to the pressure within the respiratory system of the patient. 12 The mechanical ventilator as described in claim 11 wherein said pilot is additionally responsive to pressure variations of the patient''s respiratory system indicative of self initiated inhalation.

Claim 14

Dependent Claim 34 words

The mechanical ventilator as described in claim 12 wherein means are provided to permit the independent movement between said variable volume reservoir and said piston of said piston-cylinder arrangement during exhalation of the patient.

Claim 15

Dependent Claim 29 words

The mechanical ventilator as described in claim 13 wherein said variable volume reservoir, said spill valve and said patient circuitry can be readily removed from the system for sterilization.

Claim 16

Dependent Claim 22 words

The mechanical ventilator as described in claim 14 wherein said variable volume reservoir is interchangeable with variable volume reservoirs of variable capacities.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1974-01-18	1974-07-20	1975-01-19	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-01-18	1978-07-20	1979-01-19	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-01-18	1982-07-20	1983-01-19	$7700.00	Window Closed / Lapsed

Automatic intermittent positive pressure ventilator

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