US4816019A
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US
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Infiltration detection system using pressure measurement
Assignee: Deka Products LP
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Filing: 1987-03-03
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Granted: 1989-03-28
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Expires: 2007-03-03
Abstract
Abstract A system is provided for detecting the presence of an infiltration condition in a line delivering fluid to a patient. Stepping means subjects the fluid in the line to a negative pressure step. The pressure of the fluid is monitored, and processing means then determines whether an infiltration condition is present by determining whether the function of line pressure over time in response to the occurrence of a negative pressure step exhibits a relative slow return to the pre-step pressure, such relatively slow return being characteristic of the presence of infiltration.
Inventors
- 👤 Dean L. Kamen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:51
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/004; F16K31/005; A; A61; A61M; A61M5/00; A61M5/14; A61M5/168; A61M5/16804; A61M5/16809; A61M5/16813; A61M5/16831; A61M5/16854; A61M5/16859; A61M5/36; A61M5/365; F04; F04B; F04B43/00; F04B43/02; F04B43/04; F04B43/043; G; G01; G01F; G01F11/00; G01F11/02; G01F11/08; G01F11/086; G01P; G01P13/00; G01P13/0006; G01P13/0066; A61M2005/1401; A61M2005/1403; A61M2205/00; A61M2205/15; A61M39/00; A61M39/22; A61M39/26; Y; Y10; Y10S; Y10S128/00; Y10S128/12; Y10S128/13; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7782; Y10T137/7793; Y10T137/7796; Y10T137/8593; Y10T137/87917; Y10T137/87981; Y10T137/87997; Y10T137/88005
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
105 words
A system for detecting the presence of infiltration of fluid being delivered through a line to a patient, the system comprising: stepping means for subjecting the fluid in the line to a negative pressure step; pressure monitoring means for monitoring fluid pressure in the line; and processing means, in communication with the pressure monitoring means and the stepping means, for actuating the stepping means and for determining whether the function of line pressure over time in response to the occurrence of a negative pressure step exhibits a markedly slow return to the pre-step pressure, such markedly slow return being characteristic of the presence of infiltration.
Claim 2
Independent Claim
105 words
A system for detecting the presence of infiltration of fluid being delivered through a line to a patient, the system comprising: stepping means for subjecting the fluid in the line to a negative pressure step; pressure monitoring means for monitoring fluid pressure in the line; and processing means, in communication with the pressure monitoring means and the stepping means, for actuating the stepping means and for determining whether the function of line pressure over time in response to the occurrence of a negative pressure step exhibits a markedly slow return to the pre-step pressure, such markedly slow return being characteristic of the presence of infiltration.
Claim 3
Dependent Claim
62 words
A system according to claim 1, wherein the processing means includes means (i) for determining the duration of time required for the line pressure to decrease in absolute value to a predetermined fraction of the absolute value of such pressure step, and (ii) for entering an alarm state in the event that the duration is substantially greater than a predetermined maximum limit.
Claim 4
Dependent Claim
81 words
A system according to claim 1, wherein the stepping means includes means for subjecting the fluid in the line to a pressure step that may be selectably either positive or negative; and the processing means includes means for identifying whether the function of line pressure over time in response to the occurrence of a negative pressure step is lacking in substantial symmetry with respect to the function of pressure over time in response to the occurrence of a positive pressure step.
Claim 5
Dependent Claim
100 words
A system according to claim 3, wherein the processing means includes means (i) for determining, in the event of either a positive or negative pressure step, the duration of time, up to a predetermined limit, required for the line pressure to decrease in absolute value to a predetermined fraction of the absolute value of such pressure step, (ii) for comparing the durations determined respectively for a positive and for a negative pressure step, and (iii) for entering an alarm state in the event that the duration for a negative pressure step is substantially greater than for a positive pressure step.
Claim 6
Dependent Claim
90 words
A system according to claim 1, wherein the stepping means includes: a region in pressure communication with the line; fluid housing means means for housing auxiliary fluid in communication with the region such that a change in line pressure causes a corresponding change in auxiliary fluid pressure and vice versa; and displacement means for displacing a predetermined volume increment of auxiliary fluid, such that displacement of the predetermined volume increment causes a change in the auxiliary fluid pressure, whereby the negative pressure step may be created by the displacement means.
Claim 7
Dependent Claim
109 words
A system according to claim 2, wherein the stepping means includes: a region in pressure communication with the line; auxiliary fluid housing means means for housing auxiliary fluid in communication with the region such that a change in line pressure causes a corresponding change in auxiliary fluid pressure and vice versa; and displacement means for displacing a predetermined volume increment of auxiliary fluid, such that displacement of the predetermined volume increment causes a change in the auxiliary fluid pressure, whereby the pressure step will be negative or positive according as the displacement means displaces a positive or negative volume increment of auxiliary fluid into the auxiliary fluid housing means.
Claim 8
Dependent Claim
51 words
A system according to claim 5, wherein the auxiliary fluid housing means is disposed in relation to the region so as to define collectively therewith a fixed volume that is varied by the displacement means, and wherein the region includes a flexible interface surface defining a boundary with the auxiliary fluid.
Claim 9
Dependent Claim
51 words
A system according to claim 6, wherein the auxiliary fluid housing means is disposed in relation to the region so as to define collectively therewith a fixed volume that is varied by the displacement means, and wherein the region includes a flexible interface surface defining a boundary with the auxiliary fluid.
Claim 10
Dependent Claim
21 words
A system according to claim 7, wherein the region includes a substantially hemispherical rigid enclosure with an input and an output.
Claim 11
Dependent Claim
21 words
A system according to claim 8, wherein the region includes a substantially hemispherical rigid enclosure with an input and an output.
Claim 12
Dependent Claim
68 words
A system according to claim 5, wherein the processing means includes means (i) for determining the duration of time, up to a first predetermined limit, required for the line pressure to decrease in absolute value to a predetermined fractions of the absolute value of such pressure step, and (ii) for entering an alarm state in the event that the duration is substantially greater than a second predetermined limit.
Claim 13
Dependent Claim
100 words
A system according to claim 6, wherein the processing means includes means (i) for determining, in the event of either a positive or negative pressure step, the duration of time, up to a predetermined limit, required for the line pressure to decrease in absolute value to a predetermined fraction of the absolute value of such pressure step, (ii) for comparing the durations determined respectively for a positive and for a negative pressure step, and (iii) for entering an alarm state in the event that the duration for a negative pressure step is substantially greater than for a positive pressure step.
Claim 14
Dependent Claim
12 words
A system according to claim 5, wherein the auxiliary fluid is air.
Claim 15
Dependent Claim
12 words
A system according to claim 6, wherein the auxiliary fluid is air.
Claim 16
Dependent Claim
12 words
A system according to claim 12, wherein the auxiliary fluid is air.
Claim 17
Independent Claim
240 words
A system for detecting the presence of infiltration of fluid being delivered though a line to a patient, the system comprising: a region in pressure communication with the line, such region having a flexible interface surface; auxiliary fluid housing means, for housing auxiliary fluid, such means disposed in relation to the region so as to define collectively therewith a volume that is normally fixed, and wherein the interface surface is disposed to define a boundary with the auxiliary fluid; displacement means for displacing a predetermined volume increment of auxiliary fluid, such that displacement of the predetermined volume increment causes a change in the normally fixed volume and in the auxiliary fluid pressure, so that the displacement means upon actuation will subject fluid in the line to a pressure step that may be negative or positive according as the volume increment in the fixed volume is positive or negative respectively; and processing means (i) for determining, in the event of either a positive or negative pressure step, the duration of time, up to a predetermined limit, required for the line pressure to decrease in absolute value to a predetermined fraction of the absolute value of such pressure step, (ii) for comparing the durations determined respectively for a positive and for a negative pressure step, and (iii) for entering an alarm state in the event that the duration for a negative pressure step is substantially greater than for a positive pressure step.
Claim 18
Independent Claim
240 words
A system for detecting the presence of infiltration of fluid being delivered though a line to a patient, the system comprising: a region in pressure communication with the line, such region having a flexible interface surface; auxiliary fluid housing means, for housing auxiliary fluid, such means disposed in relation to the region so as to define collectively therewith a volume that is normally fixed, and wherein the interface surface is disposed to define a boundary with the auxiliary fluid; displacement means for displacing a predetermined volume increment of auxiliary fluid, such that displacement of the predetermined volume increment causes a change in the normally fixed volume and in the auxiliary fluid pressure, so that the displacement means upon actuation will subject fluid in the line to a pressure step that may be negative or positive according as the volume increment in the fixed volume is positive or negative respectively; and processing means (i) for determining, in the event of either a positive or negative pressure step, the duration of time, up to a predetermined limit, required for the line pressure to decrease in absolute value to a predetermined fraction of the absolute value of such pressure step, (ii) for comparing the durations determined respectively for a positive and for a negative pressure step, and (iii) for entering an alarm state in the event that the duration for a negative pressure step is substantially greater than for a positive pressure step.
Claim 19
Dependent Claim
12 words
A system according to claim 16, wherein the auxiliary fluid is air.
Claim 20
Dependent Claim
29 words
A system according to claim 16, further comprising: means for actuating the displacement means and the processing means repetitively in the course of delivery of fluid through the line.
References Cited (Backward Citations)
US2116636A
Cited
US2747740A
Cited
US3618602A
Cited
DE1949616A1
Cited
US3901231A
Cited
US4010749A
Cited
US4080966A
Cited
US4392847A
Cited
US4448204A
Cited
US4378808A
Cited
US4457751A
Cited
US4332246A
Cited
US4394862A
Cited
US4395259A
Cited
US4500874A
Cited
US4525163A
Cited
US4553958A
Cited
EP0121931A2
Cited
US4534756A
Cited
US4526574A
Cited
US4530696A
Cited
US4634430A
Cited
US4648869A
Cited
US4710163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |