Portable infusion device
First Claim
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1. A portable infusion device comprising:
- (a) a rigid housing, said housing having an interior space;
(b) a flexible bag contained within said interior space, said flexible bag filled with a fluid to be delivered, said flexible bag having an outlet;
(c) a tube having a first end attached to said flexible bag outlet in flow communication with said fluid to be delivered, said tube having a second end to which said fluid is delivered in use;
(d) an inflatable bag contained within said interior space, said inflatable bag inflatable to press the flexible bag thus creating a fluid pressure within said flexible bag causing a tendency for said fluid to flow from said flexible bag through said tube for delivery to said second end of said tube;
(e) means for inflating said inflatable bag in response to a signal;
(f) control means which responds to said fluid pressure within said flexible bag for generating said signal when said fluid pressure in said flexible bag is less than a desired fluid pressure, said control means comprising;
(i) a substantially inflexible base member;
(ii) a resilient spring plate having a first end and a second end, said plate attached to said base member at said first end, said second end free to flex toward and away from said base member, said second end biased toward said base member;
(iii) a bladder in flow communication with said flexible bag wherein said bladder inflates in response to an increase in said fluid pressure and deflates in response to a decrease in said fluid pressure, said bladder compressed by said plate between said second end of said plate and said base member such that said second end of said plate flexes away from said base member in response to an inflation of said bladder and flexes toward said base member in response to a deflation of said bladder; and
(iv) means to generate said signal when said plate flexes toward said base member in response to a deflation of said bladder in response to a decrease in said fluid pressure to less than said desired fluid pressure.
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Abstract
An infusion device including a rigid accessible housing, a flexible air bag contained within the rigid housing in use, a space next to the flexible air bag for containing a drug bag in use, a line connected between the drug bag and patient in use, a pumping device connected to the air bag, a control unit for controlling the operation of the pump which includes a sensing mechanism in communication with the line or drug bag for sensing the fluid pressure therein without contaminating the medicament in the line to the patient and wherein the pumping device is activated when the pressure in the line or drug bag passes below a predetermined level.
230 Citations
9 Claims
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1. A portable infusion device comprising:
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(a) a rigid housing, said housing having an interior space; (b) a flexible bag contained within said interior space, said flexible bag filled with a fluid to be delivered, said flexible bag having an outlet; (c) a tube having a first end attached to said flexible bag outlet in flow communication with said fluid to be delivered, said tube having a second end to which said fluid is delivered in use; (d) an inflatable bag contained within said interior space, said inflatable bag inflatable to press the flexible bag thus creating a fluid pressure within said flexible bag causing a tendency for said fluid to flow from said flexible bag through said tube for delivery to said second end of said tube; (e) means for inflating said inflatable bag in response to a signal; (f) control means which responds to said fluid pressure within said flexible bag for generating said signal when said fluid pressure in said flexible bag is less than a desired fluid pressure, said control means comprising; (i) a substantially inflexible base member; (ii) a resilient spring plate having a first end and a second end, said plate attached to said base member at said first end, said second end free to flex toward and away from said base member, said second end biased toward said base member; (iii) a bladder in flow communication with said flexible bag wherein said bladder inflates in response to an increase in said fluid pressure and deflates in response to a decrease in said fluid pressure, said bladder compressed by said plate between said second end of said plate and said base member such that said second end of said plate flexes away from said base member in response to an inflation of said bladder and flexes toward said base member in response to a deflation of said bladder; and (iv) means to generate said signal when said plate flexes toward said base member in response to a deflation of said bladder in response to a decrease in said fluid pressure to less than said desired fluid pressure. - View Dependent Claims (2, 3, 4, 5)
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6. In a portable infusion device, means for controlling delivery of a fluid from a flexible bag, said delivery caused by fluid pressure in said flexible bag, said device having means for increasing said fluid pressure in response to a signal generated when said fluid pressure is less than a desired fluid pressure, said control means comprising:
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(a) a substantially inflexible base member; (b) a resilient spring plate having a first end and a second end, said plate attached to said base member at said first end, said second end free to flex toward and away from said base member, said second end biased toward said base member; (c) a bladder in flow communication with said flexible bag wherein said bladder inflates in response to an increase in said fluid pressure and deflates in response to a decrease in said fluid pressure, said bladder compressed by said plate between said second end of said plate and said base member such that said second end of said plate flexes away from said base member in response to an inflation of said bladder and flexes toward said base member in response to a deflation of said bladder; and (d) means to generate said signal when said plate flexes toward said base member in response to a deflation of said bladder in response to a decrease in said fluid pressure to less than said desired fluid pressure. - View Dependent Claims (7, 8, 9)
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Specification