GB1359531A - Method and apparatus for detecting and monitoring venous blood volume changes - Google Patents
Method and apparatus for detecting and monitoring venous blood volume changesInfo
- Publication number
- GB1359531A GB1359531A GB4469371A GB4469371A GB1359531A GB 1359531 A GB1359531 A GB 1359531A GB 4469371 A GB4469371 A GB 4469371A GB 4469371 A GB4469371 A GB 4469371A GB 1359531 A GB1359531 A GB 1359531A
- Authority
- GB
- United Kingdom
- Prior art keywords
- impedance
- resistor
- venous
- change
- amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000008280 blood Substances 0.000 title abstract 3
- 210000004369 blood Anatomy 0.000 title abstract 3
- 238000000034 method Methods 0.000 title 1
- 238000012544 monitoring process Methods 0.000 title 1
- 206010058990 Venous occlusion Diseases 0.000 abstract 3
- 238000004804 winding Methods 0.000 abstract 2
- 208000032843 Hemorrhage Diseases 0.000 abstract 1
- 230000004962 physiological condition Effects 0.000 abstract 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/026—Measuring blood flow
- A61B5/0295—Measuring blood flow using plethysmography, i.e. measuring the variations in the volume of a body part as modified by the circulation of blood therethrough, e.g. impedance plethysmography
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/053—Measuring electrical impedance or conductance of a portion of the body
- A61B5/0535—Impedance plethysmography
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Physics & Mathematics (AREA)
- Veterinary Medicine (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Hematology (AREA)
- Public Health (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Radiology & Medical Imaging (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Cardiology (AREA)
- Physiology (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
1359531 Electro-medical apparatus HB WHEELER 23 Sept 1971 [24 Sept 1970] 44693/71 Heading G1N Physiological conditions associated with blood volume changes are detected by determining the change in impedance of a body section occurring when venous return to the heart is temporarily blocked. In this manner venous occlusions and internal haemorrhages may be detected. Also, the blood flow-rate can be determined by dividing the change in impedance by the time over which the change occurs. As shown, for detecting venous occlusions in a leg a pair of current source electrodes 12 and a pair of voltage pick-up electrodes 14 are attached to the leg. Figs. 1a, 1b (not shown), and voltages E 1 , E 2 corresponding to the pick-up voltage and the energizing current are applied to a display (recorder, CRO) 46, a phase sensitive detector 48 and transformer primary windings 70a, 70b. The body impedance is first determined in a normal condition and its value is stored at 54 by closing switch 52a momentarily. The venous return to the heart is then temporarily blocked, e.g. by deep inspiration, expiration against a predetermined resistance or external pressure of a cuff, and the body impedance is stored at 56 by closing switch 56 momentarily. An amplifier 58 provides an output proportional to the difference between these impedance values. This output is applied via switch 60, to an amplifier 62, the input resistor 66 of which is variable. The transformer secondary windings 70c, 70d are arranged in a bridge circuit with resistor 74 and adjustable resistor 76, the bridge being rebalanced via motor 82 which adjusts resistor 76 and resistor 66. Thus resistor 66 has a value directly proportional to the normal impedance of the body section and thus the output of amplifier 62 is proportional to the ratio of the impedance difference to the normal impedance. This can be displayed as a percentage on a digital indicator 68 and an alarm may be provided if this percentage change is less than a pre-set value, preferably 0À2%, thus indicating a venous occlusion. As an alternative the impedance difference may be related to the body volume between the measuring electrodes.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US7522770A | 1970-09-24 | 1970-09-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1359531A true GB1359531A (en) | 1974-07-10 |
Family
ID=22124371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4469371A Expired GB1359531A (en) | 1970-09-24 | 1971-09-24 | Method and apparatus for detecting and monitoring venous blood volume changes |
Country Status (6)
| Country | Link |
|---|---|
| AU (1) | AU471144B2 (en) |
| CA (1) | CA992155A (en) |
| DE (1) | DE2147368B2 (en) |
| FR (1) | FR2106315A5 (en) |
| GB (1) | GB1359531A (en) |
| SE (1) | SE378755B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106377259A (en) * | 2016-08-30 | 2017-02-08 | 苏州品诺维新医疗科技有限公司 | Blood state detection device and method of acquiring impedance change |
| EP3027109A4 (en) * | 2013-07-29 | 2017-07-19 | The Regents of The University of Michigan | Evaluating cardiovascular health using intravascular volume |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3835839A (en) * | 1972-12-08 | 1974-09-17 | Systron Donner Corp | Impedance plethysmograph and flow rate computer adjunct and method for use therewith |
| RU2127999C1 (en) * | 1997-01-24 | 1999-03-27 | Лузянин Андрей Геннадьевич | Noninvasive method and device for determining hemodynamic parameters in biological objects |
-
1971
- 1971-09-22 DE DE2147368A patent/DE2147368B2/en not_active Ceased
- 1971-09-23 FR FR7134321A patent/FR2106315A5/fr not_active Expired
- 1971-09-23 CA CA123,561A patent/CA992155A/en not_active Expired
- 1971-09-23 AU AU33841/71A patent/AU471144B2/en not_active Expired
- 1971-09-24 SE SE7112143A patent/SE378755B/xx unknown
- 1971-09-24 GB GB4469371A patent/GB1359531A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3027109A4 (en) * | 2013-07-29 | 2017-07-19 | The Regents of The University of Michigan | Evaluating cardiovascular health using intravascular volume |
| US10314532B2 (en) | 2013-07-29 | 2019-06-11 | The Regents Of The University Of Michigan | Evaluating cardiovascular health using intravascular volume |
| CN106377259A (en) * | 2016-08-30 | 2017-02-08 | 苏州品诺维新医疗科技有限公司 | Blood state detection device and method of acquiring impedance change |
| CN106377259B (en) * | 2016-08-30 | 2019-05-31 | 苏州涵轩信息科技有限公司 | A kind of blood status detection device and the method for obtaining impedance variations value |
Also Published As
| Publication number | Publication date |
|---|---|
| CA992155A (en) | 1976-06-29 |
| DE2147368B2 (en) | 1979-09-20 |
| FR2106315A5 (en) | 1972-04-28 |
| AU471144B2 (en) | 1976-04-08 |
| DE2147368A1 (en) | 1972-04-06 |
| AU3384171A (en) | 1973-03-29 |
| SE378755B (en) | 1975-09-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee | ||
| PCPE | Delete 'patent ceased' from journal |
Free format text: 4861,PAGE 1383 |
|
| PCNP | Patent ceased through non-payment of renewal fee |