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EP4018156A1 - Détermination d'une pression de tube au moyen d'une interférométrie laser et dispositif associé - Google Patents

Détermination d'une pression de tube au moyen d'une interférométrie laser et dispositif associé

Info

Publication number
EP4018156A1
EP4018156A1 EP20761213.6A EP20761213A EP4018156A1 EP 4018156 A1 EP4018156 A1 EP 4018156A1 EP 20761213 A EP20761213 A EP 20761213A EP 4018156 A1 EP4018156 A1 EP 4018156A1
Authority
EP
European Patent Office
Prior art keywords
hose
laser
pressure
interferometry
tube
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.)
Pending
Application number
EP20761213.6A
Other languages
German (de)
English (en)
Inventor
David HANNES
Robert Lindemann
Jonas Hellhund
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.)
Fresenius Medical Care Deutschland GmbH
Fresenius Medical Care AG and Co KGaA
Original Assignee
Fresenius Medical Care Deutschland GmbH
Fresenius Medical Care AG and Co KGaA
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 Fresenius Medical Care Deutschland GmbH, Fresenius Medical Care AG and Co KGaA filed Critical Fresenius Medical Care Deutschland GmbH
Publication of EP4018156A1 publication Critical patent/EP4018156A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B9/00—Measuring instruments characterised by the use of optical techniques
    • G01B9/02—Interferometers
    • G01B9/02094—Speckle interferometers, i.e. for detecting changes in speckle pattern
    • G01B9/02095—Speckle interferometers, i.e. for detecting changes in speckle pattern detecting deformation from original shape
    • 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
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/36—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits
    • A61M1/3621—Extra-corporeal blood circuits
    • A61M1/3639—Blood pressure control, pressure transducers specially adapted therefor
    • 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
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • G01B11/161—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means
    • G01B11/162—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means by speckle- or shearing interferometry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
    • G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical 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
    • A61M2205/33—Controlling, regulating or measuring
    • A61M2205/3306—Optical measuring means

Definitions

  • the present invention relates to a method for determining a hose pressure by means of laser interferometry and a device for this.
  • the determination of the hose pressure in a fluid-carrying hose is relevant in many areas of application. For example, in extracorporeal blood treatment, in particular dialysis, it is of enormous importance to know the pressure values in the blood system or extracorporeal blood circuit.
  • the blood system is preferably part of a fluid-carrying system of an extracorporeal Blutbe treatment machine (dialysis machine), the blood from the patient to the Dialysemaschi ne and from there behind the dialyzer / filter back to the patient.
  • the pressure values are decisive for ensuring patient safety and the success of the treatment.
  • parameters depend on the pressure in the blood tube.
  • the pressure in the hose system is used as an indicator for errors. For example, changes in pressure can indicate an unwanted disconnection, e.g. due to the needles slipping out of the patient, or the needles being sucked onto the vessel wall.
  • the first solution is via a hose section in which a column of air is left in a targeted manner. Changes in the pressure in the hose lead to a direct and correlated change in the air column. This change is recorded by a pressure measuring station.
  • the second solution uses a special plastic component (pressure dome) that is integrated into the hose system. It is a plastic housing into which a membrane is inserted. This membrane is read out via a pressure sensor on the machine side.
  • pressure dome pressure dome
  • the problems of the two solutions lie in the special designs of the blood tubing system.
  • the first solution requires an additional piece of hose with air in it.
  • the contact of blood with air (air column) is problematic, as this activates blood clotting functions.
  • the blood and the machine could come into contact if the pressure rises so far that the air column is completely displaced from the tube.
  • the second solution requires a production and costly additional part that has to be introduced into the hose system.
  • the present invention is based on the object of alleviating or even eliminating the problems known from the prior art. Specifically, it is an object of the present invention to provide a method for determining a pressure inside a hose and an associated device by means of which the pressure inside a hose (also as Hose pressure) can be measured reliably and precisely without patient safety suffering due to contact of the fluid carried in the hose with any measuring structures (air column, pressure dome, etc.). In other words, a contactless method for determining the pressure inside a hose is to be created.
  • a first aspect of the present invention relates to a method for observing a changing surface by means of laser interferometry, in particular by means of laser speckle interferometry, wherein the changing surface is preferably a surface of a tube and the method for determining the pressure in the Hose is used.
  • This method takes advantage of the fact that the surface of a flexible / elastic hose changes when the pressure in the hose changes.
  • the hose expands, increasing the diameter of the hose and stretching the surface of the hose.
  • Such changes in the hose or the hose surface can be recorded by means of laser interferometry, from which the pressure prevailing in the hose can be derived.
  • the pressure in the hose can be measured without the integrity of the hose being damaged or contact with a fluid / medium (such as blood) carried in the hose having to be established.
  • the hose pressure is measured without contact.
  • the hose pressure can be determined using a laser-assisted method according to the invention, in particular laser interferometry, using two alternative procedures:
  • the change in the diameter / circumference of the hose can be detected by measuring the distance using laser interferometry.
  • the expansion of the hose is preferably recorded in that the change in the diameter of the hose is recorded.
  • a known laser-based distance measurement can be used in such a way that the expansion of the hose along the measuring axis, i.e. along the course of a laser beam used for the measurement, is recognized by a laser that is preferably firmly mounted relative to the hose by changing the distance of the hose surface.
  • the diameter can be inferred from the dimension measured in this way.
  • the cross section of the hose is circular, for example.
  • laser interferometry can be used to determine the change in the diameter of the hose by means of a laser-based distance measurement, in particular by a transit time measurement or laser triangulation interferometry, from which the pressure in the hose can be derived.
  • the expansion or the diameter of the hose is measured on at least two opposite, non-clamped sides of the hose so that it is not necessary to insert the hose precisely into the guide.
  • the diameter of the hose is measured on a plurality of hose sections which are not deformed by the fixing / guiding, a particularly precise determination of the diameter of the hose can be made.
  • known laser distance measurements can be used to determine the diameter of the hose, such as: runtime measurement (measurement of the time between sending a light pulse / laser pulse and receiving reflected light by means of a sensor), laser -Interferometry (here the phase position of incoming and outgoing light is compared), laser triangulation interferometry (here laser light is sent along two separate paths: the light is guided along a path directly to the sensor. This path serves as a reference Along a second path, the light is radiated onto an object, for example the hose, and is reflected by this before it hits the sensor).
  • the expansion of the hose or the hose surface is determined by means of laser speckle interferometry.
  • a laser radiates onto the surface of the hose, whereby the surface roughness or the structure of the surface of the hose leads to an interference pattern (“laser speckle”), which is generated with an optical sensor (e.g. CCD, CMOS, camera ) and is then preferably evaluated by an evaluation unit.
  • an optical sensor e.g. CCD, CMOS, camera
  • a change or deformation or expansion of the surface of the tube can be recognized from the recorded speckle pattern. For this it is not necessary to know the dimensions of the tube in other directions, but the change or deformation or expansion of the surface of the tube can already be determined solely on the basis of the recorded speckle pattern.
  • An evaluation unit preferably determines the extent of the area of the surface of the tube from the change in the speckle pattern.
  • a preferably partially or fully automatic pattern recognition can be used to analyze the speckle pattern.
  • machine learning can also be used to analyze the speckle pattern.
  • the changing surface is preferably arranged stationary or fixed relative to a laser light source and / or a laser receiver or sensor during a measuring process by means of a method according to the invention.
  • the observed surface - apart from the change due to the expansion - does not move relative to the laser light source and / or the laser receiver or sensor, as is the case with other applications of laser speckle interferometry (for example in computer mice) is the case.
  • observed changes in the speckle pattern are thus due to changes in the surface itself and not to a movement of the surface relative to the measuring device.
  • laser interferometry is used to determine a change, in particular an expansion, of the changing surface using an interference pattern and / or speckle pattern, from which the pressure in the hose can be derived.
  • an image analysis can be used to determine whether changes in the speckle pattern due to an undesired movement of the surface (for example due to the tube slipping in the fixation, with a trans- latory movement of the entire hose leads to a linear displacement of the pattern) or due to a change in the surface (for example deu th roller-shaped, star-shaped or spherical changes in the speckle pattern, in which the individual speckles / spots move away from each other, to an expansion of the Surface).
  • signals can be better separated from measurement artifacts due to the hose slipping.
  • an evaluation unit can advantageously be used to determine whether a measured value of the pressure in the hose (or a corresponding measured value of the diameter of the hose or a corresponding speckle pattern) falls within a tolerance range, and if the measured value is not within the tolerance range falls, an alarm is triggered.
  • a plausibility check can take place in which the measured pressure values are compared with the pressures usually occurring / expected, for example, in the context of a certain operating mode of a blood treatment machine.
  • the period of time during which a certain pressure is measured can also be taken into account.
  • the measurement can in principle be carried out continuously or intermittently at specific time intervals.
  • the tube is fixedly but detachably arranged in a fixation / guide prior to the execution of the method, whereby the measuring accuracy of the method is improved.
  • a further aspect of the invention relates to a device for determining a hose pressure by means of laser interferometry, in particular by means of laser speckle interferometry, with a laser light source or a source of coherent light; an optical sensor for detecting the light emitted by the laser light source or the source of coherent light; and an evaluation unit, which for this purpose is designed to evaluate the optical signals detected by the optical sensor.
  • the optical sensor can for example be a CCD camera, a CMOS sensor or a camera.
  • the device preferably also has a guide / fixation in which a hose can be inserted firmly but detachably.
  • the guide / fixation can be assigned to the device structurally or only functionally.
  • the guide is designed as a hose baffle, which preferably has a U-shaped guide groove for receiving a hose. This configuration allows a particularly good fixation of the hose.
  • the laser light source or source of coherent light and the sensors for detecting the emitted light are preferably integrated or built into the chicane.
  • the chicane is preferably designed in such a way that it encloses a hose received therein at least on two sides, preferably on three or even at least partially on four sides.
  • the laser light source can emit laser light of at least two different colors, the light of the different colors preferably being radiated onto the same or essentially the same point.
  • green and red diode lasers are ideal.
  • a device according to the invention is preferably arranged in a fixed or detachable manner on a hose, in particular on a hose of an extracorporeal blood treatment machine, in order to determine the pressure in the hose.
  • Another aspect relates to a system comprising a device according to the invention and a hose, the hose having a structure optimized for the measurement at least in a section on which the hose pressure is to be determined or a section which interacts with the device according to the invention.
  • the section to improve the measurement accuracy can be particularly thin-walled and / or made of a material whose properties are relatively temperature-independent (so that, for example, an expansion of the surface of the section results from a change in pressure instead of temperature).
  • the tube section can have a particularly rough surface structure to reinforce a speckle pattern or a particularly smooth structure to improve the reflective properties.
  • the tube section can also be provided with a preferably predefined pattern, on the basis of which changes in the surface can be measured.
  • Another aspect of the invention relates to a device for extracorporeal blood treatment with at least one device according to the invention.
  • FIG. 1 shows an overview of various procedures according to the invention for the contactless determination of the pressure in a hose.
  • FIG. 2 shows a fixation / guide in the form of a chicane for a hose.
  • FIG. 2a) shows a cross section of the chicane with the hose inserted and
  • FIG. 2b) shows a top view of the chicane with the hose inserted.
  • 3 shows a flow diagram of a method according to the invention.
  • the method according to the invention is based on the fact that a changing surface (preferably a surface of a tube of an extracorporeal blood treatment machine, but the invention is not limited to this) is observed in order to detect changes in the changes in the surface Inferring pressure in the hose.
  • a changing surface preferably a surface of a tube of an extracorporeal blood treatment machine, but the invention is not limited to this
  • FIG. 1 Three variants are conceivable for detecting / observing the changes in the surface using a laser, which are shown schematically in FIG. 1:
  • the measurement of the hose diameter can be carried out by means of a transit time measurement.
  • laser light 4 is emitted in pulses from a laser 5 and the time or the time interval At, based on the emission of the laser light 4, is determined until an optical detector receives a reflection of the light.
  • the distance of the surface from the laser 5 can be inferred from the transit time and the speed of light. Since the laser 5 is permanently mounted, any changes in the running time are due to changes in the distance between the surface of the hose 1 and the laser 5 and thus to changes in the pressure in the hose 1.
  • Fig. 1b illustrates the laser interferometry.
  • the term interferometry includes interferometry with triangulation, ie laser light is emitted at one location and runs on two different paths until it arrives at a second location. is merged. The light of the two different paths interferes.
  • One path is direct, ie as the crow flies from the laser 5 to a detector / sensor.
  • the second path typically goes via a reflection, for example on a surface of the hose 1.
  • the light from the laser 5 is reflected on the hose wall of the hose 1, for example. Small differences in the path length Df can be observed as an interference pattern. If the surface is stretched due to a change in pressure in the hose, the interference pattern changes accordingly.
  • Fig. 1c illustrates the laser-speckle interferometry.
  • the basis of the interference of the laser light is that the surface of the hose 1 has a certain structure / roughness. Depending on the extent of the depressions / valleys on the hose surface, constructive or destructive interference takes place. This results in a speckle pattern of light, the speckle pattern. This characteristic pattern changes with a change in the surface of the hose, for example when the hose expands due to a change in pressure.
  • the speckle pattern is detected by means of a speckle detector 6 and preferably analyzed by means of an evaluation unit.
  • the evaluation of the speckle pattern requires an image acquisition that goes beyond a light sensor.
  • a 1-D sensor strip is preferably provided, but it can also be a 2-D sensor field (or a multi-dimensional sensor field) or a camera.
  • An image evaluation records the speckle pattern and its changes and thus determines the pressure in the tube.
  • FIG. 2 shows a fixation / guide 7 in the form of a chicane for a hose 1.
  • FIG. 2a shows a cross section of the chicane 7 with the hose 1 inserted.
  • the chicane 7 encloses the hose 1 on three or in sections on four sides and has via a receiving opening 8, by means of which the hose 1 can be inserted into a groove 9.
  • the laser 5 and the speckle detector / sensor 6 are integral components of the chicane 7 or are permanently installed in it. As shown in Fig. 2a), the laser 5 and the speckle detector / sensor 6 are preferably in one Holding section 10 is embedded, which holds the hose 1 in the groove 9 and secures it against undesired falling out.
  • FIG. 2b shows a top view of the chicane 7 with the hose 1 inserted.
  • the holding section 10 can be seen particularly well.
  • the chicane 7 surrounds the hose 1 on four sides.
  • the chicane 7 also has a U-shaped structure, which enables the hose 1 to be fixed in the groove 9 in a particularly reliable manner.
  • the chicane 7 is preferably made in one piece from plastic.
  • a multi-piece design made from a different material is also conceivable.
  • a method according to the invention for observing a changing surface by means of laser interferometry, in particular by means of laser speckle interferometry can comprise the following steps:
  • the relative position to one another and / or the absolute position of the marked areas and / or landmarks / reference points can be taken into account. For example, when the pressure in the hose changes, the marked areas can move away from one another or can also be linearly shifted when the hose is shifted. Furthermore, light-dark transitions in the first speckle / interference pattern can be detected or tracked.
  • Step 4 Assigning the detected changes in the speckle / interference pattern to a change in the pressure in the tube, for example a ner expansion of the hose. If several pressures are to be measured in the hose, a calibration step is preferably carried out between the measurements.
  • Step 5 Correction or consideration of the properties of the hose, such as elasticity, diameter, reflectivity, surface roughness, etc.
  • Step 5 can be used to assign the changes in the speckle / interference pattern to a change in pressure in the hose from step 4.
  • the correction can include a plausibility check.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Vascular Medicine (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Hematology (AREA)
  • Anesthesiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Cardiology (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

La présente invention concerne un procédé d'observation d'une surface changeante au moyen d'une interférométrie laser, en particulier au moyen d'une interférométrie speckle laser, la surface changeante constituant de préférence une surface d'un tube et le procédé de détermination de la pression étant effectué dans le tube. Un autre aspect de l'invention concerne un dispositif correspondant.
EP20761213.6A 2019-08-22 2020-08-21 Détermination d'une pression de tube au moyen d'une interférométrie laser et dispositif associé Pending EP4018156A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102019122629 2019-08-22
DE102019123527.8A DE102019123527A1 (de) 2019-08-22 2019-09-03 Bestimmung eines Schlauchdrucks mittels Laser-Interferometrie sowie Vorrichtung hierfür
PCT/EP2020/073513 WO2021032880A1 (fr) 2019-08-22 2020-08-21 Détermination d'une pression de tube au moyen d'une interférométrie laser et dispositif associé

Publications (1)

Publication Number Publication Date
EP4018156A1 true EP4018156A1 (fr) 2022-06-29

Family

ID=74495582

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20761213.6A Pending EP4018156A1 (fr) 2019-08-22 2020-08-21 Détermination d'une pression de tube au moyen d'une interférométrie laser et dispositif associé

Country Status (5)

Country Link
US (1) US20220299311A1 (fr)
EP (1) EP4018156A1 (fr)
CN (1) CN114270135A (fr)
DE (1) DE102019123527A1 (fr)
WO (1) WO2021032880A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102024107509A1 (de) 2024-03-15 2025-09-18 Ifm Electronic Gmbh Messverfahren zur Detektion der Deformation einer Membran
DE102024107503A1 (de) * 2024-03-15 2025-09-18 Ifm Electronic Gmbh Drucksensor mit einer Sensorelektronik sowie ein Verfahren

Citations (5)

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US4591996A (en) * 1981-05-18 1986-05-27 Vachon Reginald I Apparatus and method for determining stress and strain in pipes, pressure vessels, structural members and other deformable bodies
US6523414B1 (en) * 2001-04-16 2003-02-25 Zevex, Inc. Optical pressure monitoring system
DE102006006371A1 (de) * 2006-02-11 2008-02-07 Christoph Budelmann Innendruckmessung in einem Schlauch mit einer optischen Messvorrichtung
US20160066790A1 (en) * 2014-09-10 2016-03-10 Samsung Electronics Co., Ltd. Laser speckle interferometric system and method for mobile devices
WO2019013089A1 (fr) * 2017-07-10 2019-01-17 テルモ株式会社 Dispositif de détection de pression et dispositif de circulation extracorporelle

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DE3838689C1 (en) * 1988-11-15 1990-06-28 Fresenius Ag, 6380 Bad Homburg, De Method for the continuous measurement of the pressure in a flexible fluid line for medical purposes, as well as a device for carrying out the method
WO1991005575A1 (fr) * 1989-10-11 1991-05-02 Baxter International Inc. Ensemble de moniteur de pression et de catheter de drainage intra-cranien integres
US6957588B1 (en) * 1999-06-28 2005-10-25 Thomas P. Kicher & Co. Fluid measuring device and method
US7245385B2 (en) * 2003-06-24 2007-07-17 Cidra Corporation Characterizing unsteady pressures in pipes using optical measurement devices
WO2009062162A1 (fr) * 2007-11-09 2009-05-14 Cidra Corporate Services, Inc. Mesures, optiques et sans contact, de débit
NZ740650A (en) * 2012-05-24 2019-06-28 Deka Products Lp Apparatus for infusing fluid
EP3026413A1 (fr) * 2014-11-27 2016-06-01 Siemens Aktiengesellschaft Détermination d'une pression interne dans un tuyau sous pression
FR3064608B1 (fr) * 2017-03-30 2020-08-07 Sartorius Stedim Fmt Sas Boitier de protection d’une poche de liquide biopharmaceutique, ensemble de protection et procede d’assemblage associes

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Publication number Priority date Publication date Assignee Title
US4591996A (en) * 1981-05-18 1986-05-27 Vachon Reginald I Apparatus and method for determining stress and strain in pipes, pressure vessels, structural members and other deformable bodies
US6523414B1 (en) * 2001-04-16 2003-02-25 Zevex, Inc. Optical pressure monitoring system
DE102006006371A1 (de) * 2006-02-11 2008-02-07 Christoph Budelmann Innendruckmessung in einem Schlauch mit einer optischen Messvorrichtung
US20160066790A1 (en) * 2014-09-10 2016-03-10 Samsung Electronics Co., Ltd. Laser speckle interferometric system and method for mobile devices
WO2019013089A1 (fr) * 2017-07-10 2019-01-17 テルモ株式会社 Dispositif de détection de pression et dispositif de circulation extracorporelle
EP3654007A1 (fr) * 2017-07-10 2020-05-20 Terumo Kabushiki Kaisha Dispositif de détection de pression et dispositif de circulation extracorporelle

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Title
See also references of WO2021032880A1 *

Also Published As

Publication number Publication date
CN114270135A (zh) 2022-04-01
US20220299311A1 (en) 2022-09-22
WO2021032880A1 (fr) 2021-02-25
DE102019123527A1 (de) 2021-02-25

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