Constant pressure infusion device
First Claim
1. A constant pressure infusion device for dispensing a physiological solution from a sterile disposable bag, said device comprising:
- (a) a housing member, said housing member having;
(i) non-expandable walls, said walls arranged to receive a disposable bag of physiological solution therewithin, said bag having a dispensing conduit extending therefrom for discharging physiological solution therethrough;
(ii) an inflatable means for pressurizing said bag of physiological solution within said walls,(b) a first pressure chamber, said chamber configured to receive a canister of pressurized fluid having a spring-loaded discharge valve mounted on said canister, said first pressure chamber being in fluid communication with the inflatable means,(c) at least one elastic wall defined by said first pressure chamber, said elastic wall, when stressed, generating at least one contractive force vector,(d) means for engaging said spring-loaded discharge valve along one of said contractive force vectors to selectively open said spring-loaded discharge valve to pressurized the first pressure chamber to a predetermined constant pressure.
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Accused Products
Abstract
The specification discloses a disposable low-cost constant pressure infusion pump intended to be used with an infusion cuff, or other infusion device for the infusion of sterile physiological solutions into the human body. The device utilizes an enclosure, which may be an infusion cuff or a pressurizing chamber that is adapted to receive a disposable bag of physiological solutions therewithin. A pressurizing chamber is formed about and around the bag of physiological solution, to define a pressure chamber to which is supplied a regulated pressure. The regulated pressure is provided from a small low-cost disposable canister of freon or other pressurizing fluid through a pressure regulating mechanism. The canister is equipped with a springloaded discharge valve, and the pressure regulating mechanism balances the spring constant of this discharge valve against an elastic wall or other resilient diaphragm to balance the loading between the elastic wall and springloaded discharge valve. A variety of actuating means and mechanisms are disclosed for balancing the two force specters to achieve a predetermined regulated pressure.
128 Citations
23 Claims
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1. A constant pressure infusion device for dispensing a physiological solution from a sterile disposable bag, said device comprising:
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(a) a housing member, said housing member having; (i) non-expandable walls, said walls arranged to receive a disposable bag of physiological solution therewithin, said bag having a dispensing conduit extending therefrom for discharging physiological solution therethrough; (ii) an inflatable means for pressurizing said bag of physiological solution within said walls, (b) a first pressure chamber, said chamber configured to receive a canister of pressurized fluid having a spring-loaded discharge valve mounted on said canister, said first pressure chamber being in fluid communication with the inflatable means, (c) at least one elastic wall defined by said first pressure chamber, said elastic wall, when stressed, generating at least one contractive force vector, (d) means for engaging said spring-loaded discharge valve along one of said contractive force vectors to selectively open said spring-loaded discharge valve to pressurized the first pressure chamber to a predetermined constant pressure.
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2. A constant pressure infusion device for dispensing a physiological solution from a sterile disposable bag, said device comprising:
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(a) a flexible, non-expandable housing member, said housing having first and second sidewalls joined together along three adjoining seams to form an open pouch, said pouch having an open end with one of said sidewalls being extended to form a closure flap for closing the open end of said pouch, (b) a flexible bladder means for receiving said bag of physiological solution therewithin, said bladder means disposed within said housing and sealed to said housing along the open end of said pouch, (c) closure means for securing said closure flap to the exterior of the opposing coplanar wall to thereby secure said bag of physiological solution within said bladder and said housing, said closure means defining an opening therein for a dispensing conduit extending from said bag of physiological solution, (d) inlet means for pressurizing a chamber formed between said housing member and said bladder, said chamber extending over substantially the entire area of said bladder when said disposable bag of physiological solution is inserted therein, (e) constant pressure means for supplying a predetermined fluid pressure to said chamber. - View Dependent Claims (3, 4, 5, 6, 7)
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8. A constant pressure infusion device for dispensing a physiological solution from a sterile disposable bag, said device comprising:
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(a) an enclosure means, said enclosure means defining a pressurizing chamber for receiving a disposable bag of physiological solution therewithin, said bag having a dispensing conduit extending therefrom for discharging physiological solution therethrough; (b) a first pressure chamber, said first chamber adapted to receive a canister of pressurized fluid having a discharge valve mounted on said canister, said first pressure chamber being in fluid communication with said pressurizing chamber; (c) a deformable and elastic wall member surrounding a portion of said first pressure chamber and in fluid communication therewith, said elastic wall arranged to generate a first force vector until the fluid pressure in said first chamber reaches a predetermined level; (d) means responsive to the movement of said elastic wall member along said force vector to selectively open said discharge valve to pressurize the first pressure chamber to said predetermined constant pressure; whereby the elastic wall member will selectively actuate the discharge valve to admit pressurized fluid into said first pressure chamber in response to a drop of pressure therein, said drop resulting from the discharge of physiological solution from disposable bag. - View Dependent Claims (9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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13. A constant pressure infusion device as claimed in claimed 10 wherein said closure means for closing said pouch includes a drawstring.
Specification