US4526569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable device for infusing insulin on the basis of glycemic measurements
Assignee: TECNOMED Srl A CORP OF ITALY
•
Filing: 1982-11-03
•
Granted: 1985-07-02
•
Expires: 2002-11-03
Abstract
Abstract The invention relates to a device made by a concentric dual lumen catheter, a pump, a small hemofilter, a glucose sensor which, by means of a microinfusion pump with a stepping motor controlled by a microprocessor can, through another concentric dual lumen catheter, inject insulin or glucose into the blood stream depending on glycemic levels.
Inventors
- 👤 Luigi Bernardi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:48
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/168; A61M5/172; A61M5/1723
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
169 words
A portable device having a circuit for blood drawing and re-immission, said circuit comprising: (a) means for drawing blood from a patient into the circuit; (b) a filter connected to said means for drawing blood, said filter being permeable only to the water and microsolutes of the drawn blood such that said water and microsolutes pass through the filter whereas other constituents of the drawn blood including cells, proteins and other macromolecules do not pass through the filter; (c) a glucose sensor connected to said filter for receiving said water and microsolutes; (d) means for connecting said glucose sensor to said filter directly such that no substance other than said water and microsolutes flows between said filter and said glucose sensor; (e) a microprocessor connected to said glucose sensor which resonds to the glucose levels measured by said sensor by sending control signals; and (f) means connected to said microprocessor for infusing glucose and or insulin into the patient in response to said control signals received from the microprocessor.
Claim 2
Dependent Claim
169 words
A portable device having a circuit for blood drawing and re-immission, said circuit comprising: (a) means for drawing blood from a patient into the circuit; (b) a filter connected to said means for drawing blood, said filter being permeable only to the water and microsolutes of the drawn blood such that said water and microsolutes pass through the filter whereas other constituents of the drawn blood including cells, proteins and other macromolecules do not pass through the filter; (c) a glucose sensor connected to said filter for receiving said water and microsolutes; (d) means for connecting said glucose sensor to said filter directly such that no substance other than said water and microsolutes flows between said filter and said glucose sensor; (e) a microprocessor connected to said glucose sensor which resonds to the glucose levels measured by said sensor by sending control signals; and (f) means connected to said microprocessor for infusing glucose and or insulin into the patient in response to said control signals received from the microprocessor.
Claim 3
Dependent Claim
15 words
The portable device of claim 1, wherein said filter is a hemofilter comprising hollow fibers.
Claim 4
Dependent Claim
25 words
The portable device of claim 1, further comprising means for infusing the cells, proteins and other macromolecules of the drawn blood back into the patient.
Claim 5
Dependent Claim
29 words
The portable device of claim 3, further comprising means for adjusting the hematocrit ratio of the cells, proteins, and other macromolecules before they are infused back into the patient.
Claim 6
Dependent Claim
46 words
The portable device of claim 4, wherein said means for adjusting said hematocrit ratio comprise a concentric dual lumen catheter with one lumen containing said cells, proteins, and other macromolecules and the other containing an amount of physiological solution required to provide an appropriate hematocrit value.
Claim 7
Dependent Claim
58 words
The portable device of claim 1, wherein said means for infusing insulin and/or glucose into the patient comprise a stepping motor, a pump, and a valve, said stepping motor acting on pulses received from said microprocessor to make the pump turn clockwise or counterclockwise to operate the valve to permit infusion of glucose or insulin into the patient.
Claim 8
Dependent Claim
116 words
The portable device of claim 6, wherein said means for infusing insulin and/or glucose into the patient comprise a "Y" shaped junction formed by the confluence of insulin and glucose tubing with the upper legs of the "Y" being respectively formed by an insulin carrying tube and a glucose carrying tube, and the lower leg of the "Y" being formed to carry either glucose or insulin into the patient, said valve comprising a plastic membrane fixed to the bottom of the intersection formed by said insulin carrying tube and said glucose carrying tube, said plastic membrane operating upon rotation of said pump to respectively open or close said insulin carrying tube or said glucose carrying tube.
Claim 9
Dependent Claim
24 words
The portable device of claim 5, further comprising means for reinfusing into the patient said water and microsolutes which have passed through said filter.
Claim 10
Dependent Claim
35 words
The portable device of claim 8, wherein said means for reinfusing into the patient said water and microsolutes comprise the concentric dual lumen catheter which forms part of said means for adjusting said hematocrit ratio.
Claim 11
Dependent Claim
34 words
The portable device of claim 9, wherein said means for infusing glucose and/or insulin into the patient comprise the concentric dual lumen catheter which forms part of said means for adjusting said hematocrit ratio.
References Cited (Backward Citations)
DE7718736U1
Cited
US3579441A
Cited
US3994799A
Cited
US4127481A
Cited
DE2737922A1
Cited
US4253456A
Cited
FR2409741A1
Cited
US4209392A
Cited
US4464172A
Cited
WO1981001794A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |