US5487649A — Infinitely variable pneumatic pulsatile pump

Claim 1

Independent Claim 93 words

A variable pneumatic pulsatile pump comprising: a pump means including at least two pneumatically independent compression chambers independently and fluidly communicating with a supply of pressurized operating fluid; a pneumatic control circuit in fluid communication with said pump means for controllably communicating said pump means with said pressurized operating fluid so as to variably and selectively supply and deprive said compression chambers with said pressurized operating fluid; and at least one supply of working fluid to be selectively admitted to and ejected from said pump means in response to said pneumatic control circuit.

Claim 2

Dependent Claim 93 words

A variable pneumatic pulsatile pump comprising: a pump means including at least two pneumatically independent compression chambers independently and fluidly communicating with a supply of pressurized operating fluid; a pneumatic control circuit in fluid communication with said pump means for controllably communicating said pump means with said pressurized operating fluid so as to variably and selectively supply and deprive said compression chambers with said pressurized operating fluid; and at least one supply of working fluid to be selectively admitted to and ejected from said pump means in response to said pneumatic control circuit.

Claim 3

Dependent Claim 84 words

The pump of claim 1, wherein said pneumatic control circuit is comprised of: a means for supplying said compressed operating fluid independently to said at least two compression chambers from a single supply of compressed operating fluid; and means for alternatingly supplying and depriving said means for supplying with pressurized operating fluid, switchable between a first, flow, state when working fluid is being discharged from said pump means and a second, no-flow, state when working fluid is not being discharged from said pump means.

Claim 4

Dependent Claim 23 words

The pump of claim 2, wherein said means for supplying is comprised of an oscillatory sub-circuit, the oscillation rate of which is adjustable.

Claim 5

Dependent Claim 17 words

The pump of claim 2, wherein said means for alternatingly supplying and depriving includes a pilot valve.

Claim 6

Dependent Claim 45 words

The pump of claim 2, further comprising sensing means responsive to the difference in pressure within the pressurized operating fluid and the pressure within the working fluid downstream of said pump means, said sensing means being fluidly communicated with said means for supplying and depriving.

Claim 7

Dependent Claim 28 words

The pump of claim 5, further comprising means for disconnecting at least one of said compression chambers from said pressurized operating fluid while said pump is in use.

Claim 8

Dependent Claim 16 words

The pump of claim 6, wherein said means for disconnecting includes at least one pilot valve.

Claim 9

Dependent Claim 69 words

The pump of claim 6, wherein working fluid is supplied to said pump means from at least two independent sources, the pump further comprising: means for switching between working fluid supplies, such that working fluid can be supplied to the pump means exclusively from a first supply thereof, or, alternatively, exclusively from a second supply thereof, etc., or, further alternatively, from more than one supply thereof at one time.

Claim 10

Dependent Claim 16 words

The pump of claim 8, wherein said means for switching includes at least one pilot valve.

Claim 11

Dependent Claim 80 words

A pneumatic pump element, comprising: at least two pneumatically independent compression chambers; a plurality of compressible bladders, one associated with each compression chamber adapted to receive and eject a quantity of working fluid; a pump cartridge communicating each bladder with at least one supply of working fluid; and means for selectively supplying compressed operating fluid to each compression chamber to selectively compress any one of said bladders to cause working fluid to be ejected through a discharge of said cartridge.

Claim 12

Dependent Claim 80 words

A pneumatic pump element, comprising: at least two pneumatically independent compression chambers; a plurality of compressible bladders, one associated with each compression chamber adapted to receive and eject a quantity of working fluid; a pump cartridge communicating each bladder with at least one supply of working fluid; and means for selectively supplying compressed operating fluid to each compression chamber to selectively compress any one of said bladders to cause working fluid to be ejected through a discharge of said cartridge.

Claim 13

Dependent Claim 79 words

The pump of claim 10, further comprising: first means for preventing reverse flow of working fluid from said bladders toward an inlet of said cartridge; second means for preventing reverse flow of working fluid from a discharge defined by said cartridge into said bladders; and a resilient diaphragm isolating said cartridge discharge from said cartridge inlet when in a first, sealing, position and allowing communication between said cartridge discharge and said cartridge inlet when in a second, venting, position.

Claim 14

Dependent Claim 55 words

The pump of claim 11, wherein said pump cartridge is comprised of a lower body member adapted to mate with at least a portion of said compressible bladders, a middle body member defining said cartridge inlet and said cartridge outlet, and an upper body member adapted to sandwich said diaphragm against said middle body member.

Claim 15

Dependent Claim 68 words

The pump of claim 11, wherein said means for preventing reverse flow of working fluid from said bladders to said working fluid sources are each comprised of at least one one-way check valve corresponding to each bladder, and said means for preventing reverse flow of working fluid from said cartridge discharge to said bladders are each comprised of at least one one-way check valve corresponding to each bladder.

Claim 16

Dependent Claim 24 words

The pump of claim 13, further comprising means communicating the cartridge discharge with the cartridge inlet when the diaphragm is in the venting position.

Claim 17

Dependent Claim 25 words

The pump of claim 14, wherein said means communicating the cartridge discharge with the cartridge inlet is a fluid flow passageway defined by the cartridge.

Claim 18

Dependent Claim 181 words

An infinitely variable pneumatic pulsatile pump, comprising: a housing; a pneumatic control circuit associated with said housing; means for controlling the function of said circuit associated with said housing; a pump inlet/outlet cartridge; at least two pneumatically independent compression cylinders, each defining its own compression chamber, each said compression chamber being fluidly communicated with said pneumatic circuit; a plurality of compressible bladders, one associated with each of said compression chambers, each said bladder defining a working fluid receiving interior volume fluidly communicated with said cartridge; each said cylinder being pivotally connected to said housing between a first, use, position, and a second, cartridge/bladder removal, position; means for locking said cartridge and cylinders into the use position reciprocally movable with respect to said housing between a first, cartridge/bladder locking, position, and a second, cartridge/bladder release, position; said pneumatic circuit being fluidly communicated with a supply of pressurized operating fluid; and said pneumatic circuit selectively, but controllably communicating said pressurized operating fluid with said compression chambers to at least partially collapse said bladders and thereby eject working fluid from said cartridge as desired.

Claim 19

Dependent Claim 181 words

An infinitely variable pneumatic pulsatile pump, comprising: a housing; a pneumatic control circuit associated with said housing; means for controlling the function of said circuit associated with said housing; a pump inlet/outlet cartridge; at least two pneumatically independent compression cylinders, each defining its own compression chamber, each said compression chamber being fluidly communicated with said pneumatic circuit; a plurality of compressible bladders, one associated with each of said compression chambers, each said bladder defining a working fluid receiving interior volume fluidly communicated with said cartridge; each said cylinder being pivotally connected to said housing between a first, use, position, and a second, cartridge/bladder removal, position; means for locking said cartridge and cylinders into the use position reciprocally movable with respect to said housing between a first, cartridge/bladder locking, position, and a second, cartridge/bladder release, position; said pneumatic circuit being fluidly communicated with a supply of pressurized operating fluid; and said pneumatic circuit selectively, but controllably communicating said pressurized operating fluid with said compression chambers to at least partially collapse said bladders and thereby eject working fluid from said cartridge as desired.

Claim 20

Dependent Claim 43 words

The pump of claim 16, wherein said pneumatic circuit is adjustable so as to cause working fluid to be ejected from said cartridge in a pulsating flow, or to cause working fluid to be ejected in a smooth flow, or any combination thereof.

Claim 21

Dependent Claim 63 words

The pump of claim 17, wherein said means for locking is comprised of: a piston/cylinder arrangement defining a piston lowering volume and a piston raising volume, said piston being movable relative to said cylinder between the cartridge/bladder locking position and the cartridge/bladder release position by the introduction of pressurized operating fluid into either the piston lowering volume or the piston raising volume, respectively.

Claim 22

Dependent Claim 150 words

The pump of claim 18, wherein: said cartridge defines an inlet chamber fluidly communicated with a source of working fluid via at least one cartridge inlet passageway; said cartridge further defining an outlet chamber fluidly communicated with a point-of-use instrument means via a cartridge discharge passageway; said cartridge inlet and outlet chambers being fluidly communicated with the interior of each of said bladders via inlet and outlet working fluid passageways, respectively; at least one check valve means disposed across each working fluid passageway so that working fluid is permitted to flow only from the cartridge inlet into each bladder interior in one direction, and thereafter ejected upon compression of said bladders through said outlet working fluid passageways toward said cartridge outlet chamber; said inlet and outlet chambers being selectively fluidly communicated with each other via a pressure release passageway; and a resilient diaphragm means normally sealing said pressure release passageway.

Claim 23

Dependent Claim 60 words

The pump of claim 19, wherein said piston arrangement of said locking means defines a sensor nose adapted to contact said diaphragm when working fluid pressure in the discharge chamber of said cartridge is greater than the operating fluid pressure present at said sensor nose, under which condition compressed operating fluid is prevented from entering any of said compression chambers.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1999-01-29	1999-07-31	2000-01-30	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2003-01-29	2003-07-31	2004-01-30	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2007-01-29	2007-07-31	2008-01-30	$7700.00	Window Closed / Lapsed

Infinitely variable pneumatic pulsatile pump

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