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WO1986007266A1 - Pressure sensing device - Google Patents

Pressure sensing device Download PDF

Info

Publication number
WO1986007266A1
WO1986007266A1 PCT/GB1986/000318 GB8600318W WO8607266A1 WO 1986007266 A1 WO1986007266 A1 WO 1986007266A1 GB 8600318 W GB8600318 W GB 8600318W WO 8607266 A1 WO8607266 A1 WO 8607266A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure sensitive
pressure
fluid
configurations
sensor
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.)
Ceased
Application number
PCT/GB1986/000318
Other languages
French (fr)
Inventor
Robert Scott Mcminn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Warner Lambert UK Ltd
Warner Lambert Co LLC
Original Assignee
Warner Lambert UK Ltd
Warner Lambert Co LLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Warner Lambert UK Ltd, Warner Lambert Co LLC filed Critical Warner Lambert UK Ltd
Publication of WO1986007266A1 publication Critical patent/WO1986007266A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
    • A61M5/16831—Monitoring, detecting, signalling or eliminating infusion flow anomalies
    • A61M5/16854—Monitoring, detecting, signalling or eliminating infusion flow anomalies by monitoring line pressure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/08—Means for indicating or recording, e.g. for remote indication
    • G01L19/12—Alarms or signals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/34—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm
    • H01H35/343—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm by snap acting diaphragm

Definitions

  • This invention relates to pressure sensing devices and more particularly concerns pressure sensing devices which are adapted for use in medical applications, espec ⁇ ially administration sets for administering fluids to the 5 body of a patient.
  • Medical fluids are introduced into a body of a pat ⁇ ient by means of an intravenous administration set which includes a source of medical fluid, a fluid flow control device and tubing which extends between the fluid flow ° control device and the patient.
  • the fluid flow control device supplies fluid to the tubing at the desired rate and in the desired volume but any fault between the fluid flow control device and the patient will prevent the des ⁇ ired administration of the fluid being achieved.
  • Problems which can occur in the use of the intraven ⁇ ous administration set include an obstruction in the tub ⁇ ing, for example because of pinching or kinking and err ⁇ ors in location relative to the patient, e.g. where an administration needle is inserted into tissue instead of ° a vein.
  • IV administration set intravenous administration set
  • a pressure transducer operatively engaged with the IV administration set tubing downstream of the fluid flow control device. This transducer produces continuously an output signal which is monitored by a pressure monitor circuit to pro- Jerusalem a warning signal when the pressure exceeds a certain predetermined maximum. The warning signal may be used to terminate fluid flow and/or to sound a warning alarm.
  • U.S. Patent Specification No. 3,704,708 describes a device for observing and measuring arterial blood pressure which comprises a housing having a cavity sealed at one end by a flexible membrane and at the other end by a pressure responsive transducer. The device is positioned over an arterial duct of the patient and the output from the transducer is displayed by suit ⁇ able display means.
  • U.S. Patent Specification No. 4,421,124 describes a pressure detection arrangement which is adapted to be embedded between the skin of a portion of the body of a patient and means to surround that portion to support or immobilise it such as a cast.
  • the pressure detection arrangement is a bifurcated capsule comprising a reser- voir cavity and an indicator cavity separated by a frang ⁇ ible disc or by an extendable bladder.
  • a coloured fluid is contained within the reservoir cavity and excess pressure between the skin and the cast, for example due to swelling, causes the coloured fluid to enter the indi- cator cavity by breaking the frangible disc or extending the bladder.
  • the indicator cavity has a transparent or translucent wall to permit visual inspection of the col ⁇ oured fluid therein.
  • U.S. Patent No. 4,316,466 discloses a fluid pressure sensor means having a variable volume chamber defined by a wall having a high coefficient of flexibility.
  • the wall expands with increase in fluid pressure therein.
  • the wall When the wall expands to a certain predetermined extent, representing a predetermined fluid pressure, it operates an associated switch means in an electrical circuit which can be used to cut-off the power to the fluid supply means to prevent a further build-up of pressure.
  • U.S. Patent Specification No. 4,146,.028 utilises an expansible chamber or accumulator tube in the IV admin- istration set for collecting and storing medical fluid in the event of a temporary blockage or restriction.
  • the object of this arrangement is to hold the medical fluid until the blockage or restriction is removed so that the desired amount of fluid is eventually delivered to the patient without the intervention of an attendant.
  • Another object is to provide a warning device which reacts quickly and positively as soon as a predetermined pressure is reached.
  • a further object is to provide a device which is in direct contact with the fluid in the IV administration set to avoid errors due to mechanical factors.
  • a pressure sensitive member having first and second config- urations, the member being movable from said first to said second configuration by application of an increased differential pressure on said member, the member having no stable configurations intermediate said first and se ⁇ cond configurations whereby rapid movement from said first to said second configuration is achieved.
  • the member is a flexible membrane which advantageously comprises a tubular portion having a clos ⁇ ed end and a peripheral radial extension at its other end.
  • the invention also includes a pressure sensitive device incorporating a pressure sensitive member in which the pressure sensitive member is disposed at the end of a tubular arm communicating with a fluid conduit for conn ⁇ ecting in the tubing of an IV administration set.
  • the device may comprise a T- or a Y-joint and the ends of the joint may be provided with luer-type connec ⁇ tions.
  • the pressure sensitive device may be provided with a sensor for detecting the configuration of the pressure sensitive member.
  • the sensor may be an optical sensor.
  • Fig. 1 is a cross-section of a device according to the present invention shown in an unoperated condition
  • Fig. 2 is a cross-section as in Figure 1 shown in an operated condition.
  • the device shown in the drawings comprises a T-shap ⁇ ed component 10 which is adapted to be incorporated in the tubing of an IV administration set downstream of a fluid flow control device.
  • the device comprises a male luer-type connection 11 for attachment to tubing connect ⁇ ed to the fluid flow control device and a female luer- type connection 12 for attachment to tubing connected to the body of a patient.
  • the device does not interfere with the flow of fluid to the patient.
  • a side tube 13 is provided with a luer-type connec ⁇ tion 14 which carries a preformed membrane 15 which com ⁇ prises a tubular portion 16 closed at one end 17 and hav- ing a peripheral radially outwardly extending flange por ⁇ tion 18.
  • the membrane 15 may be made from a flexible liquid impervious material such as a plastics or rubber material. Preferably the material employed is a rubber latex.
  • the device is connected to the body 19 of an optical sensor including a light source 20 and light detector 21. The optical sensor is connect ⁇ ed to an electronic control unit 23 connected to an aud ⁇ ible alarm generator 24.
  • the body 19 is provided with a luer-type connection to receive the connection 14 and the flange portion 18 of the membrane is retained by engage ⁇ ment with the shoulder 25.
  • the pressure at which the membrane "snaps" over can be predetermined by selecting appropriate values for a number of factors including the nature (e.g. elasticity) and thickness of the material of the membrane, the size of the membrane and the cross-sectional area of the arm 13. If desired, a number of devices having differing pressure triggering values can be provided so that a user can select an appropriate device for the particular app ⁇ lication.
  • the triggering pressure value will be about 300 mm. Hg. since research has shown that this is the maximum pressure likely to be encountered in the nor- mal operation of an IV administration set.
  • the device excluding the sensing device, can be made as a disposable unit and that is is relatively easy to produce in a sterile condition.
  • a number of modifications to the particular embodi- ment described above are possible within the scope of the invention.
  • the shape of the membrane may be modified provided that the "snap" action feature is retained.
  • the sensor can be of any type but is preferably an electronic beam device connected to an appropriate con- trol unit.
  • the control unit can provide an output signal which is used to sound an audible alarm as described above and/or a visual alarm such as a warning light.
  • the signal from the control unit can be used to prevent further build-up of pressure by removing power to the fluid flow control device and/or by releasing the pressure in the IV administration tub ⁇ ing.

Landscapes

  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Anesthesiology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Vascular Medicine (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

A pressure sensitive member (15) having first and second configurations, the member being movable from said first to said second configuration by application of an increased differential pressure on said member, the member having no stable configurations intermediate said first and second configurations whereby rapid movement from said first to said second configuration is achieved.

Description

PRESSϋRE SENSING DEVICE This invention relates to pressure sensing devices and more particularly concerns pressure sensing devices which are adapted for use in medical applications, espec¬ ially administration sets for administering fluids to the 5 body of a patient.
Medical fluids are introduced into a body of a pat¬ ient by means of an intravenous administration set which includes a source of medical fluid, a fluid flow control device and tubing which extends between the fluid flow ° control device and the patient. The fluid flow control device supplies fluid to the tubing at the desired rate and in the desired volume but any fault between the fluid flow control device and the patient will prevent the des¬ ired administration of the fluid being achieved. - Problems which can occur in the use of the intraven¬ ous administration set include an obstruction in the tub¬ ing, for example because of pinching or kinking and err¬ ors in location relative to the patient, e.g. where an administration needle is inserted into tissue instead of ° a vein. Such situations can be very dangerous as the patient may not receive the desired amount of medical fluid as delivered by the fluid flow control device or the fluid may be dispersed in tissue which can cause ser¬ ious medical problems. 5 it is known to monitor pressure in the intravenous administration set (IV administration set) downstream of the fluid flow control device and to provide an output signal when the pressure exceeds a predetermined maximum. Such a device is described, for example, in ϋ.S. Patent Specification No. 4,394,862 which incorporates a pressure transducer operatively engaged with the IV administration set tubing downstream of the fluid flow control device. This transducer produces continuously an output signal which is monitored by a pressure monitor circuit to pro- duce a warning signal when the pressure exceeds a certain predetermined maximum. The warning signal may be used to terminate fluid flow and/or to sound a warning alarm.
Pressure sensitive devices have also been proposed for detecting increases in pressure of portions of the body of a patient. U.S. Patent Specification No. 3,704,708 describes a device for observing and measuring arterial blood pressure which comprises a housing having a cavity sealed at one end by a flexible membrane and at the other end by a pressure responsive transducer. The device is positioned over an arterial duct of the patient and the output from the transducer is displayed by suit¬ able display means.
U.S. Patent Specification No. 4,421,124 describes a pressure detection arrangement which is adapted to be embedded between the skin of a portion of the body of a patient and means to surround that portion to support or immobilise it such as a cast. The pressure detection arrangement is a bifurcated capsule comprising a reser- voir cavity and an indicator cavity separated by a frang¬ ible disc or by an extendable bladder. A coloured fluid is contained within the reservoir cavity and excess pressure between the skin and the cast, for example due to swelling, causes the coloured fluid to enter the indi- cator cavity by breaking the frangible disc or extending the bladder. The indicator cavity has a transparent or translucent wall to permit visual inspection of the col¬ oured fluid therein.
U.S. Patent No. 4,316,466 discloses a fluid pressure sensor means having a variable volume chamber defined by a wall having a high coefficient of flexibility. The wall expands with increase in fluid pressure therein. When the wall expands to a certain predetermined extent, representing a predetermined fluid pressure, it operates an associated switch means in an electrical circuit which can be used to cut-off the power to the fluid supply means to prevent a further build-up of pressure.
U.S. Patent Specification No. 4,146,.028 utilises an expansible chamber or accumulator tube in the IV admin- istration set for collecting and storing medical fluid in the event of a temporary blockage or restriction. The object of this arrangement is to hold the medical fluid until the blockage or restriction is removed so that the desired amount of fluid is eventually delivered to the patient without the intervention of an attendant.
It is an object of the present invention to provide a simple warning device for use with IV administration sets which is reliable and easy to use. It is a further object to provide a warning device which is relatively easy to sterilise and in which the components thereof contacting the IV administration set are disposable.
Another object is to provide a warning device which reacts quickly and positively as soon as a predetermined pressure is reached. A further object is to provide a device which is in direct contact with the fluid in the IV administration set to avoid errors due to mechanical factors.
According to the present invention we provide a pressure sensitive member having first and second config- urations, the member being movable from said first to said second configuration by application of an increased differential pressure on said member, the member having no stable configurations intermediate said first and se¬ cond configurations whereby rapid movement from said first to said second configuration is achieved.
Preferably the member is a flexible membrane which advantageously comprises a tubular portion having a clos¬ ed end and a peripheral radial extension at its other end. The invention also includes a pressure sensitive device incorporating a pressure sensitive member in which the pressure sensitive member is disposed at the end of a tubular arm communicating with a fluid conduit for conn¬ ecting in the tubing of an IV administration set. The device may comprise a T- or a Y-joint and the ends of the joint may be provided with luer-type connec¬ tions.
The pressure sensitive device may be provided with a sensor for detecting the configuration of the pressure sensitive member.
The sensor may be an optical sensor.
Referring to the accompanying drawings:
Fig. 1 is a cross-section of a device according to the present invention shown in an unoperated condition; and
Fig. 2 is a cross-section as in Figure 1 shown in an operated condition.
The device shown in the drawings comprises a T-shap¬ ed component 10 which is adapted to be incorporated in the tubing of an IV administration set downstream of a fluid flow control device. The device comprises a male luer-type connection 11 for attachment to tubing connect¬ ed to the fluid flow control device and a female luer- type connection 12 for attachment to tubing connected to the body of a patient. Thus, in operation, the device does not interfere with the flow of fluid to the patient.
A side tube 13 is provided with a luer-type connec¬ tion 14 which carries a preformed membrane 15 which com¬ prises a tubular portion 16 closed at one end 17 and hav- ing a peripheral radially outwardly extending flange por¬ tion 18. The membrane 15 may be made from a flexible liquid impervious material such as a plastics or rubber material. Preferably the material employed is a rubber latex. In the embodiment shown the device is connected to the body 19 of an optical sensor including a light source 20 and light detector 21. The optical sensor is connect¬ ed to an electronic control unit 23 connected to an aud¬ ible alarm generator 24. The body 19 is provided with a luer-type connection to receive the connection 14 and the flange portion 18 of the membrane is retained by engage¬ ment with the shoulder 25.
When excessive pressure occurs in the fluid passing through the device the fluid pressure in arm 13 increases and at a certain predetermined critical pressure the membrane 15 will "snap" over to the position shown in Fig. 2. There are no intermediate stable positions for the membrane 15 between the positions shown in Figs. 1 and 2. in the position shown in Fig. 2 the light beam of the optical sensor is interrupted and this is detected by the control unit 23 which causes alarm 24 to be sounded.
The pressure at which the membrane "snaps" over can be predetermined by selecting appropriate values for a number of factors including the nature (e.g. elasticity) and thickness of the material of the membrane, the size of the membrane and the cross-sectional area of the arm 13. If desired, a number of devices having differing pressure triggering values can be provided so that a user can select an appropriate device for the particular app¬ lication.
Generally, the triggering pressure value will be about 300 mm. Hg. since research has shown that this is the maximum pressure likely to be encountered in the nor- mal operation of an IV administration set.
It will be apparent that the device, excluding the sensing device, can be made as a disposable unit and that is is relatively easy to produce in a sterile condition. A number of modifications to the particular embodi- ment described above are possible within the scope of the invention. The shape of the membrane may be modified provided that the "snap" action feature is retained.
The sensor can be of any type but is preferably an electronic beam device connected to an appropriate con- trol unit. The control unit can provide an output signal which is used to sound an audible alarm as described above and/or a visual alarm such as a warning light. In addition or alternatively the signal from the control unit can be used to prevent further build-up of pressure by removing power to the fluid flow control device and/or by releasing the pressure in the IV administration tub¬ ing.

Claims

1. A pressure sensitive member having first and second configurations, the member being movable from said first to said second configuration by application of an in¬ creased differential pressure on said member, the member having no stable configurations intermediate said first and second configurations whereby rapid movement from said first to said second configuration is achieved.
2. A member according to Claim 1 in which the member is a flexible membrane.
3. A member according to Claim 1 in which the member comprising a tubular portion having a closed end and a peripheral radial extension at its other end.
4. A pressure sensitive device incorporating a pressure sensitive member as claimed in any of Claims 1 to 3, in which the pressure sensitive member is disposed at the end of a tubular arm communicating with a fluid conduit for connecting in the tubing of an IV administration set.
5. A pressure sensitive device according to Claim 4, in which the device comprises a T- or a Y-joint.
6. A pressure sensitive device according to Claim 4 or 5, in which the device is provided with luer-type connec¬ tions.
7. A pressure sensitive device according to any of Claims 4 to 6 having a sensor for detecting the configur- ation of the pressure sensitive member.
8. A pressure sensitive device according to Claim 8 in which the sensor is an optical sensor.
PCT/GB1986/000318 1985-06-05 1986-06-05 Pressure sensing device Ceased WO1986007266A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8514132 1985-06-05
GB08514132A GB2176595A (en) 1985-06-05 1985-06-05 Pressure sensing device

Publications (1)

Publication Number Publication Date
WO1986007266A1 true WO1986007266A1 (en) 1986-12-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1986/000318 Ceased WO1986007266A1 (en) 1985-06-05 1986-06-05 Pressure sensing device

Country Status (4)

Country Link
JP (1) JPS62503079A (en)
AU (1) AU5966286A (en)
GB (1) GB2176595A (en)
WO (1) WO1986007266A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0288145A1 (en) * 1987-03-17 1988-10-26 Kenneth Arthur Logan Disposable pump element for dialysis pump
EP0341488A1 (en) * 1988-05-11 1989-11-15 Klaus Dipl.-Ing. Mokros Pressure membrane device for infusions
FR2664977A1 (en) * 1990-07-23 1992-01-24 Asulab Sa DEVICE FOR DETECTING A PRESSURE INSIDE A PIPE AND PUMP PROVIDED WITH SUCH A DEVICE.
US5573771A (en) * 1988-08-19 1996-11-12 Osteomedical Limited Medicinal bone mineral products
EP2777730A1 (en) * 2013-03-14 2014-09-17 IN. Medica, d.o.o. Drug infusion system comprising occlusion detector

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3688077T2 (en) * 1986-09-01 1993-09-30 Lawrence M Abrams Flow sensor.
US5693008A (en) * 1995-06-07 1997-12-02 Cobe Laboratories, Inc. Dialysis blood tubing set
US6543294B2 (en) * 2000-12-15 2003-04-08 Bell Helicopter Textron Inc. Sealed pressure indicator
US6692457B2 (en) * 2002-03-01 2004-02-17 Insulet Corporation Flow condition sensor assembly for patient infusion device
FR2894149B1 (en) * 2005-11-16 2008-09-05 Eleph Ent Technology METHOD FOR DETECTING OCCLUSION OF A TUBE FOR APPARATUS FOR DELIVERING PHYSIOLOGICAL LIQUIDS
FR2894337A1 (en) * 2005-11-16 2007-06-08 Eleph Ent Technology Tubing removing and occlusion detecting method, involves programming computer for calculating intensity of wave received by receiver during each occlusion, and determining new detection intensity threshold to be used
US9132064B2 (en) 2009-12-23 2015-09-15 Avent, Inc. Enteral feeding catheter assembly incorporating an indicator
US8439862B2 (en) 2010-12-10 2013-05-14 Kimberly-Clark Worldwide, Inc. Infusion apparatus with flow indicator
AU2015268574B2 (en) * 2010-12-10 2017-01-19 Avent, Inc. Infusion apparatus with flow indicator
ITTO20120270A1 (en) * 2012-03-26 2013-09-27 Cane Spa UNIT OF SIGNALING OF OCCLUSION FOR A PUMP FOR THE INFUSION OF DRUGS, INFUSION SYSTEM THAT INCORPORATES THAT UNIT AND THEIR METHOD OF CONTROL.
US9808567B2 (en) 2012-12-14 2017-11-07 Gambro Lundia Ab Diaphragm repositioning for pressure pod using position sensing
US10441717B2 (en) 2014-04-15 2019-10-15 Insulet Corporation Monitoring a physiological parameter associated with tissue of a host to confirm delivery of medication
US11241532B2 (en) 2018-08-29 2022-02-08 Insulet Corporation Drug delivery system with sensor having optimized communication and infusion site
DE102020207084A1 (en) * 2020-06-05 2021-12-09 B. Braun Melsungen Aktiengesellschaft Infusion filter
EP4221781A2 (en) 2020-10-02 2023-08-09 Insulet Corporation Fluid delivery device having multiple penetrating elements
WO2022133218A1 (en) 2020-12-18 2022-06-23 Insulet Corporation Adhesive pad with a metallic coil for securing an on-body medical device
WO2022251642A1 (en) 2021-05-28 2022-12-01 Insulet Corporation Spring-based status sensors
EP4101482A1 (en) 2021-06-07 2022-12-14 Insulet Corporation Exercise safety prediction based on physiological conditions

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2501867A (en) * 1947-09-17 1950-03-28 Richard T Gleisen Fluid pressure operated switch
DE1012090B (en) * 1955-07-11 1957-07-11 Max Richter Pressure gauge for displaying low pressures of liquids or gases
US3185179A (en) * 1961-05-05 1965-05-25 Pharmaseal Lab Disposable valve
US3980082A (en) * 1975-03-14 1976-09-14 William Miller Venous pressure indicator
FR2340488A1 (en) * 1976-02-03 1977-09-02 Smiths Industries Ltd Pressure:sensitive diaphragm with snap:over dome - has cylindrical or conical section at periphery of dome to improve resistance to cracking
GB1501857A (en) * 1975-04-25 1978-02-22 Marston Excelsior Ltd Fluid pressure transducers
GB2063071A (en) * 1979-08-11 1981-06-03 Godrich J Medical or surgical fluid feed arrangement
US4521683A (en) * 1981-03-20 1985-06-04 The Boeing Company Pressure-actuated optical switch

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1016694A (en) * 1961-07-15 1966-01-12 Rainsford & Lynes Ltd Improvements relating to fluid flow control valves
US3252481A (en) * 1963-08-29 1966-05-24 Ibm Fluid-controlled memory with nondestructive read out
DE2519547C3 (en) * 1975-05-02 1980-08-28 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Membrane for the movable mounting of a mounting pin of a valve closure piece
GB1543271A (en) * 1976-02-03 1979-03-28 Smiths Industries Ltd Fluid-pressure actuated switches
GB1579715A (en) * 1977-03-12 1980-11-26 Omron Tateisi Electronics Co Contacless switch and method of making the same
GB2005474B (en) * 1977-09-29 1982-04-07 Texas Instruments Inc Condition responsive devices
CA1124289A (en) * 1978-05-15 1982-05-25 Donald E. Place Snap disc operated pressure switch
US4240372A (en) * 1979-03-15 1980-12-23 Davis Allen V Pressure responsive annunciator

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2501867A (en) * 1947-09-17 1950-03-28 Richard T Gleisen Fluid pressure operated switch
DE1012090B (en) * 1955-07-11 1957-07-11 Max Richter Pressure gauge for displaying low pressures of liquids or gases
US3185179A (en) * 1961-05-05 1965-05-25 Pharmaseal Lab Disposable valve
US3980082A (en) * 1975-03-14 1976-09-14 William Miller Venous pressure indicator
GB1501857A (en) * 1975-04-25 1978-02-22 Marston Excelsior Ltd Fluid pressure transducers
FR2340488A1 (en) * 1976-02-03 1977-09-02 Smiths Industries Ltd Pressure:sensitive diaphragm with snap:over dome - has cylindrical or conical section at periphery of dome to improve resistance to cracking
GB2063071A (en) * 1979-08-11 1981-06-03 Godrich J Medical or surgical fluid feed arrangement
US4521683A (en) * 1981-03-20 1985-06-04 The Boeing Company Pressure-actuated optical switch

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0288145A1 (en) * 1987-03-17 1988-10-26 Kenneth Arthur Logan Disposable pump element for dialysis pump
EP0341488A1 (en) * 1988-05-11 1989-11-15 Klaus Dipl.-Ing. Mokros Pressure membrane device for infusions
US5573771A (en) * 1988-08-19 1996-11-12 Osteomedical Limited Medicinal bone mineral products
FR2664977A1 (en) * 1990-07-23 1992-01-24 Asulab Sa DEVICE FOR DETECTING A PRESSURE INSIDE A PIPE AND PUMP PROVIDED WITH SUCH A DEVICE.
EP0468331A1 (en) * 1990-07-23 1992-01-29 Asulab S.A. Overpressure detector and pump incorporating the same
EP2777730A1 (en) * 2013-03-14 2014-09-17 IN. Medica, d.o.o. Drug infusion system comprising occlusion detector

Also Published As

Publication number Publication date
GB8514132D0 (en) 1985-07-10
JPS62503079A (en) 1987-12-10
AU5966286A (en) 1987-01-07
GB2176595A (en) 1986-12-31

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