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US4648869A
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US
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Automatic infiltration detection system and method
Assignee: American Hospital Supply Corp
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Filing: 1985-12-04
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Granted: 1987-03-10
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Expires: 2005-12-04
Abstract
Abstract An infusion system for infusing a flowable material into a patient comprising an infusion device for delivering the flowable material in both a normal delivery pattern and a test pulse and a conduit for conducting the flowable material from the infusion device to the patient. The test pulse creates a pressure wave response in the conduit. The pressure wave response is monitored and used to detect if the infiltration has occurred.
Inventors
- 👤 Donald E. Bobo, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:19
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/168; A61M5/16831; A61M5/16854; A61M5/16859; Y; Y10; Y10S; Y10S128/00; Y10S128/18
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
124 words
An infusion system for infusing a flowable material into a patient comprising: an infusion device for delivering the flowable material, said infusion device including means for delivering the flowable material in a normal delivery pattern and for delivering a test pulse of the flowable material with the test pulse being different from the normal delivery pattern and with the test pulse providing an increased flow rate of flowable material; conduit means for conducting the flowable material from the infusion device to the patient, said test pulse creating a pressure wave response in the conduit means; and means responsive to the pressure wave response in the conduit means for detecting if the flowable material is being improperly supplied by the conduit means to the patient.
Claim 2
Dependent Claim
124 words
An infusion system for infusing a flowable material into a patient comprising: an infusion device for delivering the flowable material, said infusion device including means for delivering the flowable material in a normal delivery pattern and for delivering a test pulse of the flowable material with the test pulse being different from the normal delivery pattern and with the test pulse providing an increased flow rate of flowable material; conduit means for conducting the flowable material from the infusion device to the patient, said test pulse creating a pressure wave response in the conduit means; and means responsive to the pressure wave response in the conduit means for detecting if the flowable material is being improperly supplied by the conduit means to the patient.
Claim 3
Dependent Claim
19 words
An infusion system as defined in claim 1 wherein said normal delivery pattern has an essentially constant flow rate.
Claim 4
Dependent Claim
63 words
An infusion system as defined in claim 1 wherein said delivering means includes means for delivering a reduced flow rate of the flowable material adjacent the test pulse with said reduced flow rate being less than the flow rate during the normal delivery pattern to at least partially compensate for the increased flow rate of the flowable material provided during the test pulse.
Claim 5
Dependent Claim
27 words
An infusion system as defined in claim 3 wherein said reduced flow rate delivery means provides said reduced flow rates on opposite sides of the test pulse.
Claim 6
Dependent Claim
97 words
An infusion system as defined in claim 4 wherein the infusion device includes means for enabling the infusion device to selectively deliver the flowable material at different selected flow rates and means responsive to the selected flow rates for controlling the flow rate of the flowable material provided during the test pulse, and said controlling means decreases the ratio of test pulse flow rate to selected flow rate for increased selected flow rates and said detecting means includes means responsive to the rate of change of the pressure wave response in the conduit means for detecting infiltration.
Claim 7
Dependent Claim
52 words
An infusion system as defined in claim 1 wherein said delivering means includes means for enabling the infusion device to selectively deliver the flowable material at different selected flow rates and means responsive to the selected flow rate for controlling the flow rate of the flowable material provided during the test pulse.
Claim 8
Dependent Claim
29 words
An infusion system as defined in claim 6 wherein said controlling means decreases the ratio of test pulse flow rate to selected flow rate for increased selected flow rates.
Claim 9
Dependent Claim
27 words
An infusion system as defined in claim 1 wherein said delivering means includes means for selectively causing the infusion device to initiate a test pulse on demand.
Claim 10
Dependent Claim
51 words
An infusion system as defined in claim 1 wherein said detecting means includes means responsive to the rate of change of at least a portion of the pressure wave response in the conduit means for detecting if the flowable material is being improperly supplied by the conduit means to the patient.
Claim 11
Dependent Claim
38 words
An infusion system as defined in claim 1 wherein said detecting means detects the improper supply of the flowable material when the pressure change of at least a portion of the pressure wave response exceeds a predetermined magnitude.
Claim 12
Dependent Claim
88 words
An infusion system as defined in claim 1 wherein said detecting means includes a pressure transducer for providing a pressure signal which is related to the pressure in the conduit means, means for sampling said pressure signal at least during a sample time which occurs at least partially during the pressure wave response to provide a plurality of digital samples and means responsive to the samples obtained during said sample time for detecting if the flowable material is being improperly supplied by the conduit means to the patient.
Claim 13
Dependent Claim
55 words
An infusion system as defined in claim 1 wherein said detecting means is responsive at all infusion rates of the infusion device to the change in pressure of the same portion of the pressure wave response during a predetermined period for detecting if supply of the flowable material is being properly supplied to the patient.
Claim 14
Independent Claim
158 words
An apparatus for use with an infusion device which infuses flowable material at any of a plurality of selected infusion rates through conduits means to a patient with the delivery of the flowable material from the infusion device including a pulse which provides a pressure wave response in the conduit means whose characteristics change depending upon whether or not the conduit means is properly supplying the flowable material to the patient, said apparatus comprising: a pressure transducer for providing a pressure signal which is related to at least a portion of the pressure wave response; means responsive to the same characteristic of the pressure wave response as represented by the pressure signal at all of said infusion rates for detecting if the flowable material is being properly supplied to the patient by the conduit means; and means responsive to the detecting means for providing remedial action if the flowable material is not being properly supplied to the patient.
Claim 15
Independent Claim
158 words
An apparatus for use with an infusion device which infuses flowable material at any of a plurality of selected infusion rates through conduits means to a patient with the delivery of the flowable material from the infusion device including a pulse which provides a pressure wave response in the conduit means whose characteristics change depending upon whether or not the conduit means is properly supplying the flowable material to the patient, said apparatus comprising: a pressure transducer for providing a pressure signal which is related to at least a portion of the pressure wave response; means responsive to the same characteristic of the pressure wave response as represented by the pressure signal at all of said infusion rates for detecting if the flowable material is being properly supplied to the patient by the conduit means; and means responsive to the detecting means for providing remedial action if the flowable material is not being properly supplied to the patient.
Claim 16
Dependent Claim
24 words
An apparatus as defined in claim 13 wherein said characteristic is the change in pressure of the pressure wave response during a predetermined period.
Claim 17
Independent Claim
97 words
A method for determining if a flowable material is being properly supplied to a patient by an infusion system, said method comprising: delivering the flowable material through conduit means to a patient's vascular system in a normal delivery pattern and in a test pulse, with the test pulse being different from the normal delivery pattern and with the test pulse creating a pressure wave response in the conduit means; and monitoring at least a portion of the pressure wave response to detect if the flowable material is being improperly supplied by the conduit means to the patient.
Claim 18
Independent Claim
97 words
A method for determining if a flowable material is being properly supplied to a patient by an infusion system, said method comprising: delivering the flowable material through conduit means to a patient's vascular system in a normal delivery pattern and in a test pulse, with the test pulse being different from the normal delivery pattern and with the test pulse creating a pressure wave response in the conduit means; and monitoring at least a portion of the pressure wave response to detect if the flowable material is being improperly supplied by the conduit means to the patient.
Claim 19
Dependent Claim
31 words
A method as defined in claim 15 wherein said step of delivering the flowable material in a normal delivery pattern includes delivering the flowable material at an essentially constant flow rate.
Claim 20
Dependent Claim
47 words
A method as defined in claim 15 wherein said step of delivering includes delivering the flowable material at a reduced flow rate for a predetermined length of time to at least partially compensate for the increased flow rate of the flowable material provided during the test pulse.
Claim 21
Dependent Claim
38 words
A method as defined in claim 15 wherein said step of monitoring includes sensing the rate of change of the pressure of at least a portion of the pressure wave response and utilizing this information to detect infiltration.
Claim 22
Dependent Claim
36 words
A method as defined in claim 15 wherein said step of monitoring includes monitoring the same characteristic of the pressure wave response regardless of the flow rate of the flowable material during said normal delivery pattern.
Claim 23
Independent Claim
97 words
A method for detecting infiltration wherein an infusion device infuses the flowable material at any of a plurality of selected infusion rates through a conduit means to a patient's vascular system with the delivery of the flowable material from the infusion device including a pulse which provides a pressure wave response in the conduit means whose characteristics change depending upon whether or not infiltration has occurred, said method comprising: monitoring the same characteristic of the pressure wave response regardless of the infusion rates to detect if infiltration has occurred; and providing remedial action if infiltration is detected.
Claim 24
Independent Claim
97 words
A method for detecting infiltration wherein an infusion device infuses the flowable material at any of a plurality of selected infusion rates through a conduit means to a patient's vascular system with the delivery of the flowable material from the infusion device including a pulse which provides a pressure wave response in the conduit means whose characteristics change depending upon whether or not infiltration has occurred, said method comprising: monitoring the same characteristic of the pressure wave response regardless of the infusion rates to detect if infiltration has occurred; and providing remedial action if infiltration is detected.
Claim 25
Dependent Claim
28 words
A method as defined in claim 20 wherein said characteristic is the change in pressure of a portion of the pressure wave response occurring during a predetermined period.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |