EP2972121A1 - Aiguille tournante et indicateur de pression à soufflets en expansion - Google Patents

Aiguille tournante et indicateur de pression à soufflets en expansion

Info

Publication number
EP2972121A1
EP2972121A1 EP14770082.7A EP14770082A EP2972121A1 EP 2972121 A1 EP2972121 A1 EP 2972121A1 EP 14770082 A EP14770082 A EP 14770082A EP 2972121 A1 EP2972121 A1 EP 2972121A1
Authority
EP
European Patent Office
Prior art keywords
bellows
plate
base
chamber
defining
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.)
Withdrawn
Application number
EP14770082.7A
Other languages
German (de)
English (en)
Other versions
EP2972121A4 (fr
Inventor
David Troy ROWE
John C. VICTOR
Jeffrey Vitullo
Rodney Wilmer DENLINGER
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.)
Teleflex Medical Inc
Original Assignee
Teleflex Medical Inc
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 Teleflex Medical Inc filed Critical Teleflex Medical Inc
Publication of EP2972121A1 publication Critical patent/EP2972121A1/fr
Publication of EP2972121A4 publication Critical patent/EP2972121A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
    • 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/04—Tracheal tubes
    • A61M16/0434—Cuffs
    • A61M16/044—External cuff pressure control or supply, e.g. synchronisation with respiration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
    • G01L7/02—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges
    • G01L7/06—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges of the bellows type
    • G01L7/063—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges of the bellows type with mechanical transmitting or indicating means
    • 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
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/58—Means for facilitating use, e.g. by people with impaired vision
    • A61M2205/583—Means for facilitating use, e.g. by people with impaired vision by visual feedback
    • A61M2205/584—Means for facilitating use, e.g. by people with impaired vision by visual feedback having a color code

Definitions

  • the present invention relates generally to pressure indicators. More particularly, the present invention relates to a pressure indicator suitable for an inflatable cuff of an endotracheal tube.
  • Inflatable cuffs have been proposed for applying occlusive pressure to a flow lumen of a patient's body, or for sealing between a medical instrument and a flow lumen of a patient's body.
  • an endotracheal tube may include an inflatable cuff that conforms to the contours of a patient's trachea when inserted into the trachea and inflated to seal a gap between the endotracheal tube and the trachea.
  • pressure indicators have been proposed for monitoring a fluid pressure within an inflatable cuff.
  • U.S. Patent No. 4,727,887 (hereinafter "the '887 patent") describes an artificial sphincter with an occlusion cuff for applying occlusive pressure to a flow lumen of a patient's body (e.g., a urethra).
  • the '887 patent further proposes a combination hypodermic manometer including a piston assembly which is adapted for reciprocal movement through a fluid-filled sleeve. As the piston assembly of the '887 patent is moved through the sleeve, a bellows is compressed, thereby changing a height of fluid within a manometer fluidly coupled to the bellows.
  • Pressure indicators including a bellows within a hollow housing made of a transparent material, such that an indicator mark on the bellows is visible through the housing, are known for use with pressure cuff devices.
  • such devices may have long axial lengths to provide sufficient indication precision, and may not work with opaque housing materials.
  • an apparatus in some embodiments includes a plate defining a hole therethrough, and a shaft rotatable about an axis, the shaft including a helical surface disposed within the hole through the plate, wherein a portion of the plate is in fluid communication with a fluid whose pressure is to be measured.
  • One aspect of the present invention advantageously provides a fluid pressure indicating device including a base defining a base aperture therethrough; a plate separated from the base by a variable distance, the plate defining a hole therethrough; a shaft rotatable about a first axis, the shaft including a helical surface disposed within the hole of the plate; a first bellows extending between the base and the plate; and a second bellows extending between the base and the plate, the second bellows disposed around the first bellows, the first bellows and the second bellows defining a first chamber therebetween.
  • the first bellows and the second bellows expand or contract in response to a difference between a pressure inside the first chamber and a pressure outside the first chamber, and the variable distance between the base and the plate varies upon expansion or contraction of the first bellows and the second bellows, such that the shaft rotates relative to the plate.
  • an expandable cuff system including a tube defining a lumen therein; an expandable bladder in fluid communication with the lumen; and a fluid pressure indicator.
  • the fluid pressure indicator includes a plate defining a hole therethrough, and a shaft rotatable about a first axis, the shaft including a helical surface disposed within the hole through the plate. A portion of the plate is in fluid communication with the expandable bladder through the lumen.
  • Yet another aspect of the present invention advantageously provides a fluid pressure indicating device including a base defining a base aperture therethrough; a plate separated from the base by a variable distance, the plate defining a hole therethrough; a shaft rotatable about a first axis, the shaft including a helical surface disposed within the hole of the plate; first means for defining a variable volume extending between the base and the plate; and second means for defining the variable volume extending between the base and the plate, the second means for defining the variable volume disposed around the first means for defining the variable volume.
  • the first means for defining the variable volume and the second means for defining the variable volume define a first chamber therebetween.
  • a volume of the first chamber expands or contracts in response to a difference between a pressure inside the first chamber and a pressure outside the first chamber, and the variable distance between the base and the plate varies upon expansion or contraction of the volume of the first chamber, such that the shaft rotates relative to the plate.
  • FIG. 1 presents a schematic view of a pressure cuff system according to an embodiment of the present invention.
  • FIG. 2 presents a schematic view of a pressure cuff system according to another embodiment of the present invention.
  • FIG. 3 presents a schematic view of an endotracheal tube system according an embodiment of the present invention.
  • FIG. 4 shows a cross section of the endotracheal tube system illustrated in FIG. 3 along section 3-3.
  • FIG. 5 presents a perspective view of a pressure indicator according to an embodiment of the present invention.
  • FIG. 6 shows an exploded view of the pressure indicator in FIG. 5.
  • FIG. 7 shows an exploded view of a variant of the pressure indicator according to another embodiment of the present invention.
  • FIG. 8 shows a top view of the pressure indicator in FIG. 5.
  • FIG. 9 shows a cross sectional view of the pressure indicator in FIG. 8 along section 9—9.
  • FIG. 10 shows an upper perspective view of a bellows assembly according to an embodiment of the present invention.
  • FIG. 11 shows a lower perspective view of the bellows assembly illustrated in FIG. 10.
  • An embodiment in accordance with the present invention provides a pressure indicator for detecting an inflation pressure applied to an inflatable cuff.
  • FIG. 1 presents a schematic view of a pressure cuff system 10 according to an embodiment of the present invention.
  • the pressure cuff system 10 includes an inflatable cuff 12 in fluid communication with a pressurized fluid source 14 through a supply channel 16.
  • the pressure cuff system 10 further includes a pressure indicator 18 in fluid communication with the supply channel 16, such that a flow of pressurizing fluid from the pressurized fluid source 14 flows through the pressure indicator 18 en route to the inflatable cuff 12.
  • the pressurizing fluid may include any liquid fluid, such as water, or any gaseous fluid, such as air, for example.
  • the pressure cuff system 10 may include a first valve 20 disposed in the supply channel 16, and a second valve 24 branching off from the supply channel 16 and in fluid communication therewith.
  • the first valve 20 is a check valve oriented such that the first valve 20 permits flow only in a direction from the pressurized fluid source 14 toward the inflatable cuff 12.
  • the first valve 20 is a normally-closed, spring-loaded isolation valve that is configured to be opened by a syringe luer engaging the pressure cuff system 10 as the pressurized fluid source 14.
  • the valve 24 is a manually operated bleed valve.
  • the valve 24 is a spring-loaded pressure relief valve that is configured to vent pressure from the inflatable cuff 12 at a threshold high pressure.
  • the pressurized fluid source 14 could include any pump, such as, for example, a syringe, an elastic bulb, a rotary pump, or a positive displacement pump; a plenum pressurized with a fluid; combinations thereof; or any other means for delivering a pressurized fluid known to persons with ordinary skill in the art.
  • the inflatable cuff 12 could include an elastic membrane or other structure that expands upon pressurization known to persons with ordinary skill in the art.
  • FIG. 2 presents a schematic view of a pressure cuff system 10 according to an alternate embodiment of the present invention.
  • the pressure indicator 18 is in fluid communication with the supply channel 16 through a branch channel 25.
  • the pressure indicator 18 has an inlet in fluid communication with the supply channel 16 but no outlet.
  • FIG. 3 presents a schematic view of an endotracheal tube system 26 according an embodiment of the present invention
  • FIG. 4 shows a cross section of the endotracheal tube system 26 illustrated in FIG. 3 along section 3—3.
  • the endotracheal tube system 26 includes an elongated tube 28, defining a main lumen 30 (see FIG. 4) therein.
  • the inflatable cuff 12 is disposed around an outer periphery 32 of the elongated tube 28. In one embodiment, the inflatable cuff 12 defines an annular volume therein, which surrounds the elongated tube 28.
  • the elongated tube 28 may further define an inflation lumen 34 (see FIG. 4), which is fluidly coupled to a volume within the inflatable cuff 12.
  • the supply channel 16 may be fluidly coupled to the inflation lumen 34, thereby effecting fluid communication between the inflatable cuff 12 and the pressurized fluid source 14.
  • FIG. 5 presents a perspective view of a pressure indicator 18 according to an embodiment of the present invention.
  • the pressure indicator 18 includes a housing 36 that defines an inlet port 38 and may define an exit port 40.
  • the pressure indicator 18 may be fluidly coupled to the supply channel 16 (see FIG. 1) through both the inlet port 38 and the exit port 40, or coupled to the supply channel 16 (see FIG. 2) through only the inlet port 38 when there is no exit port 40.
  • the pressure indicator 18 may include a pointer 42 and pressure indicia 44.
  • FIG. 6 shows an exploded view of the pressure indicator 18 in FIG. 5.
  • An internal surface 46 of the housing 36 further defines a cavity 48 therein.
  • the cavity 48 of the housing 36 receives a shaft 50 having a helical surface 52, and a bellows assembly 54.
  • the bellows assembly 54 includes at least one bellows 56 a plate 58.
  • the plate 58 defines a hole 60 therethrough, where the hole 60 receives the helical surface 52 of the shaft 50.
  • the pressure indicator 18 may include a housing top 62 disposed on the housing 36.
  • the pressure indicia 44 are disposed on the housing top 62.
  • the pressure indicia 44 may be disposed on the plate 58.
  • the housing top 62 may define a hole 64 therethrough, such that the hole 64 receives the shaft 50.
  • a pointer 42 may be coupled to a first end 68 of the shaft 50, such that the pointer 42 rotates in unison with the shaft 50.
  • the pressure indicator 18 may further include a window 70 disposed on the housing top 62, such that the pointer 42 is disposed between the housing top 62 and the window 70.
  • At least a portion of the window 70 is permeable to visible light such that a user of the pressure indicator 18 can see at least a portion of the housing top 62, the pointer 42, or combinations thereof. Further, all of the window 70 may be substantially transparent or translucent. In one embodiment, translucent pressure indicia 71 may be disposed on the window 70, such that the pointer 42 is visible through the translucent pressure indicia 71 and the window 70.
  • FIG. 7 shows an exploded view of a variant of the pressure indicator 18 according to another embodiment of the present invention.
  • a disk 72 is coupled to the shaft 50, such that the disk 72 rotates in unison with the shaft 50.
  • Pressure indicia 44 may be disposed on the disk 72 and an indicating mark 74 may be disposed on the window 70, such that the indicating mark 74 does not move relative to the housing 36.
  • the non-limiting embodiment shown in FIG. 7 may include any of the features shown in FIG. 6, either individually or in combination.
  • FIG. 8 shows a top view of the pressure indicator 18 in FIG. 5
  • FIG. 9 shows a cross sectional view of the pressure indicator 18 along section line 9-9 in FIG. 8.
  • the housing 36 further includes a base 76 and a wall 78 extending from the base 76.
  • the internal surface 46 of the housing 36 may be a surface of the wall 78 that faces the bellows assembly 54.
  • the bellows assembly 54 includes an outer bellows 80 and an inner bellows 82, such that the outer bellows 80 is disposed around the inner bellows 82. Both the outer bellows 80 and the inner bellows 82 extend between the base 76 of the housing 36 and the plate 58. Further, both the outer bellows 80 and the inner bellows 82 are attached to the base 76 and the plate 58 by sealed connections at longitudinal ends of each bellows.
  • the sealed connections between the bellows 80, 82 and the base 76 and the plate 58 may include welds, adhesives, fasteners such as screws or rivets, combinations thereof, or other fasteners known to persons of ordinary skill in the art.
  • the housing 36 further defines a flow channel 84 therethrough.
  • the flow channel 84 is in fluid communication with both the inlet port 38 and the exit port 40.
  • the pressure indicator 18 is connected to a branch channel 25 off of the supply channel 16 of a pressure cuff system 10 (See FIG. 2)
  • the flow channel 84 is only in fluid communication with an inlet port 38.
  • the outer bellows 80, inner bellows 82, base 76, and the plate 58 define a first chamber 86 therein.
  • the first chamber 86 may be in fluid communication with the flow channel 84 via one or more base apertures 88 extending through the base 76.
  • the housing 36, the outer bellows 80, the inner bellows 82, and the plate 58 may define a second chamber 90.
  • the second chamber 90 may be sealed from an ambient environment 92 of the pressure indicator 18.
  • the housing 36 may define an aperture 94 therethrough, such that the second chamber 90 may be in fluid communication with the ambient environment 92 through the aperture 94.
  • the outer bellows 80 and the inner bellows 82 may include a flexible membrane having a substantially cylindrical shape.
  • the bellows 80, 82 may be fabricated from a polymer, metal foil, textiles, papers, combinations thereof, or other similar materials known to persons with ordinary skill in the art.
  • the bellows 80, 82 include a corrugated structure, which contributes to the resiliency of the bellows 80, 82.
  • the bellows 80, 82 are free from corrugations, yet derive resilience from elastic properties of the material forming the membrane.
  • the plate 58 is separated from the base 76 by a variable distance 96, depending upon a pressure difference between the first chamber 86 and the second chamber 90.
  • Resilience of the outer bellows 80 or the inner bellows 82 may bias the plate 58 toward the base 76 of the housing 36.
  • resilience of the outer bellows 80 may bias the location of the plate 58 toward a position that minimizes the volume within the first chamber 86 and maximizes the volume within the second chamber 90.
  • a pressure difference between the first chamber 86 and the second chamber 90 also increases, thereby extending the bellows 80, 82 in an axial direction of the shaft 50.
  • the variable distance 96 between the plate 58 and the base 76 increases with increasing pressure within the flow channel 84.
  • a volume within the first chamber 86 increases with increasing pressure within the flow channel 84.
  • the base 76 may include a rotational bearing 98 that engages a second end 100 of the shaft 50, thereby allowing the shaft 50 to rotate about an axis 97 of the shaft 50.
  • the housing top 62 may include a rotational bearing 102 that engages the shaft 50. Accordingly, the rotational position of the shaft 50 relative to the housing 36, and therefore also the rotational position of the pointer 42, are functionally related to the pressure difference between the first chamber 86 and the second chamber 90.
  • the pressure indicia 44 may be designed to either quantitatively or qualitatively indicate a difference in pressure between the first chamber 86 and the second chamber 90 in cooperation with the pressure indicia 44, 71 on the housing 36.
  • the pressure indicia 44 quantitatively delineate pressure magnitudes sensed.
  • the pressure indicia 44 qualitatively indicate a first range 104 where the pressure is too low, a second range 106 where the pressure is acceptable, and a third range 108 where the pressure is too high (see FIG. 8).
  • unique colors may be associated with each of the first range 104, the second range 106, and the third range 108.
  • the first range 104, the second range 106, and the third range 108 could be associated with the colors yellow, green, and red, respectively.
  • Persons of skill in the art will appreciate that other similar pressure indicia 44 may be applied to the pressure indicator 18 based on the particular application. Further, it will be appreciated that the examples for pressure indicia 44 also apply to the translucent pressure indicia 71 (see FIG. 6) previously discussed.
  • FIG. 10 shows an upper perspective view of a bellows assembly 54 according to an embodiment of the present invention
  • FIG. 11 shows a lower perspective view of the bellows assembly 54 illustrated in FIG. 10.
  • the bellows assembly 54 has an inner bellows 82 and an outer bellows 80.
  • the inner bellows extends in a substantially longitudinal direction 1 10 from a first annular edge 1 12 toward an end cap 114.
  • An intersection of the inner bellows 82 and the end cap 1 14 may define a second annular edge 1 16.
  • the end cap 1 14 may extend in a substantially radial direction 118 from the second annular edge 1 16 toward the outer bellows 80.
  • An intersection of the end cap 1 14 and the outer bellows 80 may define a third annular edge 120.
  • the outer bellows 80 extends away from the end cap 1 14 in a substantially longitudinal direction alongside the inner bellows 82. In another embodiment, the outer bellows 80 terminates at a fourth annular edge
  • the bellows assembly 54 may be fabricated from a single, continuous piece of material.
  • the inner bellows 82 and the end cap 114 may be fabricated from separate pieces of material and then be joined by welding, adhesive, or other fastening method known to persons with ordinary skill in the art.
  • the outer bellows 80 and the end cap 114 may be fabricated from separate pieces of material and then be joined by welding, adhesive, or other fastening method known to persons with ordinary skill in the art.
  • the pressure indicator 18 is useful to indicate a fluid pressure within a pressure cuff system 10, the pressure indicator 18 can also be used to measure fluid pressure in other systems that could benefit from either quantitative or qualitative indication of a fluid pressure.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Pulmonology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Emergency Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • Anesthesiology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measuring Fluid Pressure (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)

Abstract

La présente invention concerne un dispositif d'indication de pression de fluide. Le dispositif d'indication de pression de fluide comprend une base définissant une ouverture à travers elle, une plaque séparée de la base par une distance variable, la plaque définissant un trou à travers elle, un arbre comprenant une surface hélicoïdale disposée dans le trou de la plaque, un premier soufflet s'étendant entre la base et la plaque et un second soufflet s'étendant entre la base et la plaque, le second soufflet disposé autour du premier soufflet, le premier soufflet et le second soufflet définissant une première chambre entre eux. Le premier soufflet et le second soufflet se mettent en expansion ou se contractent en réponse à une différence entre la pression à l'intérieur de la première chambre et une pression à l'extérieur de la première chambre. La distance variable entre la base et la plaque varie selon la mise en expansion ou la contraction du premier soufflet et du second soufflet, de sorte que l'arbre tourne par rapport à la plaque.
EP14770082.7A 2013-03-14 2014-03-14 Aiguille tournante et indicateur de pression à soufflets en expansion Withdrawn EP2972121A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201361784546P 2013-03-14 2013-03-14
PCT/US2014/027806 WO2014152807A1 (fr) 2013-03-14 2014-04-29 Aiguille tournante et indicateur de pression à soufflets en expansion

Publications (2)

Publication Number Publication Date
EP2972121A1 true EP2972121A1 (fr) 2016-01-20
EP2972121A4 EP2972121A4 (fr) 2016-02-24

Family

ID=51527775

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14770082.7A Withdrawn EP2972121A4 (fr) 2013-03-14 2014-03-14 Aiguille tournante et indicateur de pression à soufflets en expansion

Country Status (7)

Country Link
US (1) US20140271292A1 (fr)
EP (1) EP2972121A4 (fr)
JP (1) JP2016513807A (fr)
CN (1) CN105190252A (fr)
AU (1) AU2014236571A1 (fr)
CA (1) CA2906087A1 (fr)
WO (1) WO2014152807A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3525841A4 (fr) * 2016-10-17 2020-04-08 Micromed Co., Ltd. Micro-dispositif d'administration
WO2019143707A1 (fr) * 2018-01-16 2019-07-25 Q.E.D. Environmental Systems, Inc. Système de surveillance de niveau de fluide et procédé incorporant un système de capteur de pression ayant un sac gonflable/repliable
DE102018107852B4 (de) * 2018-04-03 2023-07-20 Trafag Ag Dichtewächter mit integrierter Niederdruckanzeige
GB201817046D0 (en) * 2018-10-19 2018-12-05 Breatnach Cormac A medical device
CN112562472B (zh) * 2020-12-10 2022-09-23 河北中医学院 一种多功能洗胃模型和洗胃训练方法
ES2956095A1 (es) * 2022-05-05 2023-12-13 Eiberle Claudio Cristino Gerster Monitorización continua de la presión del neumotaponamiento del tubo endotraqueal

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Publication number Priority date Publication date Assignee Title
US1652941A (en) * 1925-10-12 1927-12-13 Gen Electric Fluid-flow indicator
GB553211A (en) * 1941-11-10 1943-05-12 Victor Asarius Kennett Improvements in or relating to pressure gauges
US2652859A (en) * 1948-05-18 1953-09-22 Bendix Aviat Corp High altitude pressure responsive capsule
US3055219A (en) * 1958-03-31 1962-09-25 Dewrance & Co Pressure gauges
US3262317A (en) * 1963-09-30 1966-07-26 Jr Somers H Smith Differential pressure gage
JPS5174477U (fr) * 1974-12-09 1976-06-11
JPS5926892B2 (ja) * 1979-07-09 1984-07-02 株式会社コスモ計器 絶対圧センサ
WO1982003916A1 (fr) * 1981-04-27 1982-11-11 Fuzzell Joe E Transducteur de pression
US4727887A (en) 1985-07-08 1988-03-01 Habley Medical Technology Corporation Hypodermic manometer
AUPS255902A0 (en) * 2002-05-24 2002-06-13 Ultimate Medical Pty. Ltd. Device and method for pressure indication
CN201281614Y (zh) * 2008-11-04 2009-07-29 杭州华源人工环境工程有限公司 一种变风量末端的风量测量装置
AU2010204546A1 (en) * 2009-01-15 2011-08-04 Beth Israel Deaconess Medical Center Pressure measuring syringe
CN102346055B (zh) * 2010-08-03 2012-09-12 深圳市泉源仪表设备制造有限公司 差压-位移双参数测量的变面积靶式流量计

Also Published As

Publication number Publication date
US20140271292A1 (en) 2014-09-18
WO2014152807A1 (fr) 2014-09-25
CA2906087A1 (fr) 2014-09-25
JP2016513807A (ja) 2016-05-16
WO2014152807A8 (fr) 2015-10-15
EP2972121A4 (fr) 2016-02-24
CN105190252A (zh) 2015-12-23
AU2014236571A1 (en) 2015-10-22

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