US4010749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of detecting infiltration of infused liquid by comparing altered skin temperature with skin temperature in area of infiltrated liquid
Assignee: SHAW ASSOCIATES A CALIFORNIA PARTNERSHIP
•
Filing: 1975-05-09
•
Granted: 1977-03-08
•
Expires: 1995-05-09
Abstract
Abstract Perivascular infiltration of liquid being administered to a patient is detected by the method of altering the temperature of a region of the patient's skin adjacent the site of a transcutaneous puncture and providing an output indicative of the difference between the altered skin temperature and the temperature of the infiltrated liquid.
Inventors
- 👤 Robert F. Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:48
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/168; A61M5/16831; A61M5/16836
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
126 words
The method of detecting liquid-infusion infiltration into the skin of a patient which is at a temperature not sufficiently different from the temperature of the liquid being infused, the method comprising the steps of: placing a liquid-delivery conduit into a blood vessel of a patient for delivering an infusion liquid into a blood vessel of the patient; altering the patient's skin surface temperature relative to the temperature of the liquid in a region of the skin overlying the tip of the intravascular portion of the liquid conduit means; and sensing the difference between the skin surface temperature due to the accumulation of the infused liquid in the perivascular region and the altered skin temperature for providing an output indicative of the difference between the two temperatures.
Claim 2
Independent Claim
126 words
The method of detecting liquid-infusion infiltration into the skin of a patient which is at a temperature not sufficiently different from the temperature of the liquid being infused, the method comprising the steps of: placing a liquid-delivery conduit into a blood vessel of a patient for delivering an infusion liquid into a blood vessel of the patient; altering the patient's skin surface temperature relative to the temperature of the liquid in a region of the skin overlying the tip of the intravascular portion of the liquid conduit means; and sensing the difference between the skin surface temperature due to the accumulation of the infused liquid in the perivascular region and the altered skin temperature for providing an output indicative of the difference between the two temperatures.
Claim 3
Dependent Claim
35 words
The method according to claim 1 wherein the step of altering the patient's skin surface temperature is accomplished by heating said region of the patient's skin to a temperature above the temperature of the liquid.
Claim 4
Dependent Claim
35 words
The method according to claim 1 wherein the step of altering the patient's skin surface temperature is accomplished by cooling said region of the patient's skin to a temperature below the temperature of the liquid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |