US4574812A
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US
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Arterial thrombus detection system and method
Assignee: Kendall Co
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Filing: 1984-04-18
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Granted: 1986-03-11
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Expires: 2004-04-18
Abstract
Abstract An arterial thrombus detection system (4) measures and displays the elapsed times (ET1, ET2, etc.) for an arterial pulse to travel between selected pairs of locations (A and B, B and C) along the length of a patient's limb (10, 12). The arterial pulse sensors comprise inflatable cuffs (A, B, C) with pressure sensors (A, B, C) that are flexibly secured together to form a sleeve (6, 8) which is wrapped around the limb (10, 12). A pair of start/stop timers (46, 48) are controlled in accordance with arterial detection pulses to measure the elapsed times (ET1, ET2, etc.). Display of elapsed times (ET1, ET2, etc.) which are significantly different signifies a thrombus in the section of the limb associated with the relatively longest elapsed time.
Inventors
- 👤 Edward J. Arkans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:30
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/02007; A61B5/021; A61B5/022; A61B5/026; A61B5/0285
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
78 words
An arterial thrombus detection system, comprising: means for sensing the passage of an arterial pulse past at least three selected locations spaced along the length of a patient's limb; means responsive to the sensing means to determine the time elapsed for passage of the pulse between different pairs of said selected locations; and means for displaying a relationship between elapsed times of different pairs of selected locations which is indicative of a possible arterial thrombus of the limb.
Claim 2
Dependent Claim
78 words
An arterial thrombus detection system, comprising: means for sensing the passage of an arterial pulse past at least three selected locations spaced along the length of a patient's limb; means responsive to the sensing means to determine the time elapsed for passage of the pulse between different pairs of said selected locations; and means for displaying a relationship between elapsed times of different pairs of selected locations which is indicative of a possible arterial thrombus of the limb.
Claim 3
Dependent Claim
53 words
The arterial thrombus detection system of claim 1 in which said sensing means includes, in association with each selected location, an inflatable cuff for pressurized snug engagement with the limb at the selected location associated therewith, and a sensor for detecting fluctuation in the pressure of the cuff caused by an arterial pulse.
Claim 4
Dependent Claim
26 words
The arterial thrombus detection system of claim 2 in which said sensor comprises a transducer for converting pressure fluctuations into corresponding fluctuations of an electrical signal.
Claim 5
Dependent Claim
41 words
The arterial thrombus detection system of claim 1 in which sensing means includes an elongate sleeve for receipt therewithin of a patient's limb, and a plurality of sensors carried by said sleeve at different points therealong associated with said selected locations.
Claim 6
Dependent Claim
47 words
The arterial thrombus detection system of claim 4 in which said sleeve includes a plurality of inflatable cuffs respectively associated with said plurality of sensors, and each of said sensors senses the fluctuation of pressure in its associated cuff caused by passage of an arterial pulse thereby.
Claim 7
Dependent Claim
18 words
The arterial thrombus detection system of claim 4 in which said sleeve includes flexible webs between adjacent sensors.
Claim 8
Dependent Claim
47 words
The arterial thrombus detection system of claim 1 in which said sensing means includes a plurality of sensors for respectively sensing an arterial pulse at said selected locations, and each of said sensors generates an electrical pulse in response to the sensing of an arterial pressure pulse.
Claim 9
Dependent Claim
30 words
The arterial thrombus detection system of claim 7 in which the elapsed time determining means includes at least a pair of start/stop timers controlled in accordance with said electrical pulses.
Claim 10
Dependent Claim
96 words
The arterial thrombus detection system of claim 8 in which the elapsed time determining means includes means for starting the first timer in response to the first sensing of an arterial pulse at an upstream one of said selected locations, means for stopping the timing by the first timer and starting the timing by the second timer in response to sensing of the arterial pulse at the next successive selected location, and means for stopping the timing of the second timer in response to sensing of the arterial pulse at the second next successive selected location.
Claim 11
Dependent Claim
30 words
The arterial thrombus detection system of claim 8 including a display device associated with each of said timers for displaying an indication of the elapsed time measured by said timer.
Claim 12
Dependent Claim
29 words
The arterial thrombus detection system of claim 10 in which said elapsed time determining means includes means for resetting said timer after an elapsed time measurement has been made.
Claim 13
Dependent Claim
31 words
The arterial thrombus detection system of claim 1 in which said displaying means includes means for displaying the elapsed times associated with at least two successive pairs of said selected locations.
Claim 14
Dependent Claim
43 words
The arterial thrombus detection system of claim 1 in which said sensing means includes an elongate sleeve with a plurality of sensors, and means associated with the sleeve for enabling similar placement of the sensors relative to anatomical landmarks of different sized limbs.
Claim 15
Independent Claim
88 words
A method of detecting an arterial thrombus in a limb, comprising the steps of: inserting the limb in a special sleeve having at least three arterial pulse sensors spaced along the sleeve; arranging the sleeve on the limb to place the sensors in sensing engagement with the limb at selected locations spaced therealong; determining in response to the sensors the elapsed times for an arterial pulse to travel between selected pairs of the selected locations; and displaying a relationship between said elapsed times indicative of an arterial thrombus.
Claim 16
Independent Claim
88 words
A method of detecting an arterial thrombus in a limb, comprising the steps of: inserting the limb in a special sleeve having at least three arterial pulse sensors spaced along the sleeve; arranging the sleeve on the limb to place the sensors in sensing engagement with the limb at selected locations spaced therealong; determining in response to the sensors the elapsed times for an arterial pulse to travel between selected pairs of the selected locations; and displaying a relationship between said elapsed times indicative of an arterial thrombus.
Claim 17
Dependent Claim
33 words
The method of claim 14 in which said sensors comprise inflatable cuffs with associated pressure sensors, and said step of arranging includes the step of pressuring said cuffs with a preselected bias pressure.
Claim 18
Dependent Claim
32 words
The method of claim 14 in which said step of displaying the relationship includes the step of simultaneously displaying the elapsed times of at least two of said selected pairs of locations.
Claim 19
Dependent Claim
25 words
The method of claim 14 in which said step of determining includes the step of controlling a pair of timers in response to said sensors.
Claim 20
Independent Claim
91 words
A method of detecting an arterial thrombus in a limb, comprising the steps of: determining the elapsed time for an arterial pulse to travel between a first pair of locations spaced along the limb; determining the elapsed time for an arterial pulse to travel between a second pair of locations spaced along the limb; displaying a relationship between the two elapsed times of the two pairs of locations indicative of an arterial thrombus present at a point intermediate the pair of locations having the relatively, proportionately largest elapsed time associated therewith.
Claim 21
Independent Claim
91 words
A method of detecting an arterial thrombus in a limb, comprising the steps of: determining the elapsed time for an arterial pulse to travel between a first pair of locations spaced along the limb; determining the elapsed time for an arterial pulse to travel between a second pair of locations spaced along the limb; displaying a relationship between the two elapsed times of the two pairs of locations indicative of an arterial thrombus present at a point intermediate the pair of locations having the relatively, proportionately largest elapsed time associated therewith.
Claim 22
Dependent Claim
74 words
The method of claim 18 in which said steps of determining include the steps of: sensing an arterial pulse as it passes each of the pair of locations; starting a timer in response to the pulse being sensed at the first one of the pair of locations; and stopping the timer in response to the pulse being sensed at the second one of the pair of locations to be passed by the arterial pulse.
Claim 23
Dependent Claim
25 words
The method of claim 18 in which said step of determining includes the step of controlling a timer in accordance with an arterial pulse detector.
References Cited (Backward Citations)
US3835840A
Cited
US3996924A
Cited
US4144878A
Cited
US4169463A
Cited
DE2751004A1
Cited
US4166455A
Cited
FR2471177A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |