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WO2006037969A1 - Extensometre - Google Patents

Extensometre Download PDF

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Publication number
WO2006037969A1
WO2006037969A1 PCT/GB2005/003777 GB2005003777W WO2006037969A1 WO 2006037969 A1 WO2006037969 A1 WO 2006037969A1 GB 2005003777 W GB2005003777 W GB 2005003777W WO 2006037969 A1 WO2006037969 A1 WO 2006037969A1
Authority
WO
WIPO (PCT)
Prior art keywords
strain gauge
substrate
gauge assembly
circuit board
connector
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/GB2005/003777
Other languages
English (en)
Inventor
Ken Hall
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.)
ZI Medical PLC
Original Assignee
ZI Medical PLC
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 ZI Medical PLC filed Critical ZI Medical PLC
Publication of WO2006037969A1 publication Critical patent/WO2006037969A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/2287—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges constructional details of the strain gauges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/14—Rotary-transmission dynamometers wherein the torque-transmitting element is other than a torsionally-flexible shaft
    • G01L3/1478—Rotary-transmission dynamometers wherein the torque-transmitting element is other than a torsionally-flexible shaft involving hinged levers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0271—Arrangements for reducing stress or warp in rigid printed circuit boards, e.g. caused by loads, vibrations or differences in thermal expansion
    • 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
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
    • A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
    • 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
    • A61M5/172—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 electrical or electronic
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/18—Printed circuits structurally associated with non-printed electric components
    • H05K1/181—Printed circuits structurally associated with non-printed electric components associated with surface mounted components
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09009—Substrate related
    • H05K2201/09072—Hole or recess under component or special relationship between hole and component
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/10083—Electromechanical or electro-acoustic component, e.g. microphone
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/10151—Sensor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10431—Details of mounted components
    • H05K2201/10439—Position of a single component
    • H05K2201/10446—Mounted on an edge
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
    • H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
    • H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
    • H05K3/341—Surface mounted components
    • H05K3/3431—Leadless components
    • H05K3/3442—Leadless components having edge contacts, e.g. leadless chip capacitors, chip carriers

Definitions

  • the present invention relates to strain gauges and in particular to surface mounted strain gauges for circuit boards.
  • Strain gauges are well known and sometimes comprise a thin strip of polymeric material, into or onto which an electrically resistive track is laid. A voltage is then applied to the track and the current monitored. When the gauge is strained, the track either lengthens and thins or shortens and thickens depending on the nature of the strain. This dimensional change causes the electrical resistance of the track to either increase or decrease, which causes the measured current to decrease or increase, respectively.
  • Multiple tracks may be provided for measuring strains in various directions.
  • strain gauges are expensive because of their relative complexity and small size. Furthermore, using strain gauges tends to be expensive, as they must usually be applied, i.e. stuck to a surface using an adhesive, by a skilled technician. A further problem with known strain gauges is that they cannot be easily wired up due to the small size of the contacts and the fragility of the devices themselves.
  • strain gauges are varied, and include, materials testing applications, avionics for continuous monitoring of aircraft components in flight and weighing / force measurement devices. Another application of strain gauges is measuring the torque transmitted by a motor.
  • a motor can be mounted such that it can rotate to a certain extent about its axle.
  • the motor is secured using resilient legs that extend tangentially from its housing.
  • One or more of the legs have a strain gauge associated therewith that can detect deformations in that leg.
  • the motor will try to twist about its axle with a torque equal to the torque in the motor system.
  • the legs will restrain that torque, and the strain gauge or gauges will detect forces transmitted through the legs to counter the torque.
  • a syringe driver generally comprises a mechanical assembly adapted to engage with a syringe.
  • the mechanical assembly is used to decant a specified amount of liquid, e.g. a drug, from the syringe into a user at a desired rate.
  • a specified amount of liquid e.g. a drug
  • syringe driver technology has developed, certain advantages have been discovered in varying the speed of drug delivery. For example, it is desirable to monitor the backpressure in a syringe, i.e. the pressure of the user's blood against which the drug is being forced, to ensure that the drug delivery rate is compliant with one or more physiological parameters.
  • the present invention aims to overcome one or more of the above problems. It is also an object of the present invention to provide an improved strain gauge.
  • a first aspect of the invention provides a strain gauge assembly suitable for mounting on a circuit board comprising; a substrate having a first end and a second end; one or more mounting pads; and a connector located near to an edge of the first end of the substrate; and one or more electrical pathways extending from the connector to a strain gauge located towards the second end of the substrate; wherein the strain gauge assembly is adapted for cantilevered attachment by the mounting pads over an edge of the circuit board; and resilient deformation relative to the circuit board.
  • the circuit board can be of any type, used in any application.
  • the strain gauge can be of any suitable type.
  • the substrate is preferably tapered. Where the substrate is tapered, the first end is preferably wider than the second end.
  • the substrate is preferably manufactured of a polymeric material, although any resilient, electrically insulative material would suffice.
  • the substrate is preferably tapered and preferably substantially trapezoidal in shape, having one pair of opposite sides parallel.
  • the substrate may have a constant thickness or may thin towards one end.
  • the one or more mounting pads are preferably manufactured of a solderable material, such as copper or tin.
  • the mounting pads may optionally serve as electrical connections between the substrate and circuit board, hence good electrical conductivity is a possible desirable feature.
  • the connector can be of any suitable type.
  • a multiple-pin, push fit connector is preferred for ease of use.
  • Additional securing means may be associated with the connector, such as a securing clip.
  • the connector is preferably adapted for engagement with a complementary connector located on the circuit board.
  • the electrical pathways of the invention may be wires or other suitable connectors. Tracks formed from deposited or etched-away copper, aluminium or tin are possible
  • the strain gauge is located towards the second end of the substrate, preferably substantially centrally.
  • a second aspect of the invention provides a method of manufacturing a strain gauge assembly comprising the steps of; depositing one or more mounting pads and one or more conducting tracks on a substrate; affixing a strain gauge and a connector to the substrate, the conducting tracks forming at least one electrical connection between the strain gauge and connector; and cutting the substrate to form a strain gauge assembly; the method being characterised in that the mounting pads are located near to an edge of the end of the substrate.
  • the order of the method steps is not important, e.g. the order in which the tracks/mounting pads are deposited or the order in which the strain gauge/connector are affixed.
  • the substrate is preferably tapered, e.g. trapezoidal in shape. Where the substrate is tapered, the mounting pads are preferably located at the wider end thereof.
  • the step of depositing one or more mounting pads and one or more conducting tracks on a substrate can be achieved by any suitable means. Laying-down of electrical wires or forming electrical tracks by Printed Circuit Board (PCB) techniques are possible means.
  • PCB Printed Circuit Board
  • strain gauge and connector can be affixed to the substrate by any suitable means, e.g. gluing or by clipping thereto.
  • the substrate can be cut to shape at any stage of the manufacturing process, although it is envisaged that doing so as a last step would be most convenient.
  • a third aspect of the invention provides a torque monitor for a motor comprising a motor resiliently mounted via a mounting means to a circuit board, the mounting means being arranged to interact with a strain gauge assembly adapted for cantilevered attachment by mounting pads over an edge of the circuit board and resilient deformation relative to the circuit board; wherein the strain gauge assembly comprises; a substrate having a first end and a second end; one or more mounting pads and a connector located near to an edge of the first end of the substrate; and one or more electrical pathways extending from the connector to a strain gauge located towards the second end of the substrate.
  • the torque monitor may be implemented by any suitable means.
  • the strain gauge assembly is arranged to overhanging a cut out, edge or aperture in the circuit board.
  • a motor may then be resiliency fastened to the circuit board using a mounting means.
  • the mounting means is preferably adapted to interact with the strain gauge assembly, i.e. by causing it to flex under the influence of a compressive force generated by the torque in the motor during use. Flexure of the strain gauge in use preferably causes a detectable signal from the strain gauge to be generated.
  • Figure 1 shows a schematic end view of the strain gauge assembly used in conjunction with a motor
  • Figure 2 shows how the strain gauge assembly is affixed to a circuit board
  • Figure 3 is a schematic manufacturing step diagram for the invention.
  • Figure 4 shows a circuit board lay-up prior to cutting.
  • a strain gauge assembly 10 according to the invention is shown overhanging a cut out 12 in a circuit board 14.
  • a motor 16 is resiliency fastened to the circuit board using legs 18.
  • the intended direction of rotation of the motor 16 is denoted by arrow A.
  • a compressive force is thereby transmitted through leg 18'.
  • the force causes the strain gauge assembly 10 to flex, which causes a detectable signal from the strain gauge to be generated.
  • forces in the opposite sense can be measured so long as a tensional force can be adequately transmitted to the strain gauge assembly 10.
  • FIGS. 2 and 3 show the strain gauge assembly 10 of the invention in greater detail from above.
  • the circuit board 14 has a square-shaped cut out 12 therein. Copper locating pads 20, formed by conventional PCB manufacturing techniques, are located on the circuit board near to the inner edge 22 of the cut out 12.
  • a female connector 24 is also provided, which is addressed by a series of copper tracks 26, also manufactured via conventional PCB techniques.
  • the strain gauge assembly 10 comprises a tapered substrate 28 having a wide end 30 and a narrow end 32. Mounting pads 34 are provided on the corners of the substrate 28 at the wide end 30 thereof. Tracks 36 are provided to connect a male connector 38 to a strain gauge 40.
  • the substrate 28 is manufactured of a resilient polymeric material and the mounting pads 34 and tracks 36 are disposed thereon using conventional manufacturing techniques.
  • the strain gauge assembly 10 is adapted for cantilevered location over an edge 22 of the circuit board 14 by soldering respective mounting pads 20 & 34 to one another and by engaging the male connector 38 with the female connector 24.
  • electrical signals generated by the strain gauge 40 during flexure can be detected via the copper tracks 26 on the circuit board 14.
  • a force can be applied to any part of the strain gauge assembly 10, although the nearer to the narrow end 32 and centrally that force is applied, the greater the sensitivity that is to be
  • strain gauge assembly 10 Location of the strain gauge assembly 10 is relatively straightforward, as it held in-situ by the connectors 24 & 38 whilst a technician or robot solders the mounting pads 20 & 34 in a conventional manner. Removal and replacement of the strain gauge assembly 10 is, likewise, relatively straightforward and is accomplished by the reverse of the above.
  • the mounting pads are used to provide an electrical connection between the copper tracks of the circuit board and the strain gauge, hi this embodiment just the arrangement of tracks on the strain gauge assembly and the type of connectors has been changed. Furthermore, it will be appreciated that a cut out is not required, as the strain gauge assembly can be mounted overhanging the edge of the circuit board itself. hi a further alternate embodiment of the invention (not shown) the strain gauge assembly is located overhanging an aperture in the substrate. The present invention thereby enables convenient location of the strain gauge assembly at any desired location on a circuit board.
  • Figure 3 shows a possible manufacturing route for the invention.
  • a bare substrate 28 is shown; in Figure 3b, copper mounting pads 34 and tracks 36 have been formed by conventional PCB manufacturing techniques; in Figure 3c the strain gauge 40 is stuck to the substrate using a suitable proprietary adhesive; and in Figure 3d, the connector 38 is affixed using conventional techniques.
  • Figure 4 shows how it is possible to scale-up production by manufacturing a plurality of strain gauge assemblies 10 on a single substrate. It is envisaged that the various manufacturing steps by carried out using automated techniques, e.g. using robots or manipulators to position the various components and to make the necessary electrical connections etc.
  • the tapered shape of individual strain gauge assemblies 10 is formed by slicing the substrate 28, post-manufacture along the cut-lines denoted C.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

L’invention concerne un ensemble d’extensomètre (10) pouvant être fixé sur une carte circuit (14) comprenant : un substrat (28) ayant une première extrémité (30) et une deuxième extrémité (32) ; un ou plusieurs coussins de montage (34) ; un connecteur (38) situé à proximité d’un bord de la première extrémité (30) du substrat ; un ou plusieurs chemins d’accès électriques (36) s’étendant du connecteur (38) à un extensomètre (40) en direction de la deuxième extrémité (32) du substrat ; l’ensemble d’extensomètre (10) étant adapté pour être fixé en porte-à-faux sur un bord (22) de la carte circuit (14) à l'aide des coussins de montage (34) ; et une déformation élastique se produisant par rapport à la carte de circuit (14). Un procédé de fabrication de l'ensemble d’extensomètre (10) et son application sont également décrits.
PCT/GB2005/003777 2004-10-01 2005-09-30 Extensometre Ceased WO2006037969A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0421858.2 2004-10-01
GB0421858A GB0421858D0 (en) 2004-10-01 2004-10-01 Strain gauge

Publications (1)

Publication Number Publication Date
WO2006037969A1 true WO2006037969A1 (fr) 2006-04-13

Family

ID=33427921

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2005/003777 Ceased WO2006037969A1 (fr) 2004-10-01 2005-09-30 Extensometre

Country Status (2)

Country Link
GB (1) GB0421858D0 (fr)
WO (1) WO2006037969A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8177747B2 (en) 2009-12-22 2012-05-15 Alcon Research, Ltd. Method and apparatus for drug delivery
US8372036B2 (en) 2009-05-06 2013-02-12 Alcon Research, Ltd. Multi-layer heat assembly for a drug delivery device
US9022970B2 (en) 2006-10-16 2015-05-05 Alcon Research, Ltd. Ophthalmic injection device including dosage control device
US9782541B2 (en) 2006-10-16 2017-10-10 Alcon Research, Ltd. Temperature control device and thermal sensor assembly for medical device
WO2021068998A1 (fr) * 2019-10-11 2021-04-15 4Dot Mechatronic Systems S.R.O. Capteur de contrainte et ensemble de mesure de contrainte comprenant le capteur

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020134167A1 (en) * 2001-03-20 2002-09-26 Robert Rainey Strain gage sensor having an unstrained area
WO2003025533A1 (fr) * 2001-09-20 2003-03-27 Honeywell International, Inc. Capteur piézo-résistif à contrainte uniforme
WO2004052429A1 (fr) * 2002-12-10 2004-06-24 Zi Medical Plc Ensemble pousse-seringue

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020134167A1 (en) * 2001-03-20 2002-09-26 Robert Rainey Strain gage sensor having an unstrained area
WO2003025533A1 (fr) * 2001-09-20 2003-03-27 Honeywell International, Inc. Capteur piézo-résistif à contrainte uniforme
WO2004052429A1 (fr) * 2002-12-10 2004-06-24 Zi Medical Plc Ensemble pousse-seringue

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9022970B2 (en) 2006-10-16 2015-05-05 Alcon Research, Ltd. Ophthalmic injection device including dosage control device
US9782541B2 (en) 2006-10-16 2017-10-10 Alcon Research, Ltd. Temperature control device and thermal sensor assembly for medical device
US8372036B2 (en) 2009-05-06 2013-02-12 Alcon Research, Ltd. Multi-layer heat assembly for a drug delivery device
US8632511B2 (en) 2009-05-06 2014-01-21 Alcon Research, Ltd. Multiple thermal sensors in a multiple processor environment for temperature control in a drug delivery device
US8177747B2 (en) 2009-12-22 2012-05-15 Alcon Research, Ltd. Method and apparatus for drug delivery
WO2021068998A1 (fr) * 2019-10-11 2021-04-15 4Dot Mechatronic Systems S.R.O. Capteur de contrainte et ensemble de mesure de contrainte comprenant le capteur

Also Published As

Publication number Publication date
GB0421858D0 (en) 2004-11-03

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