WO1999037983A2 - Druckdom zur verbindung eines messwertaufnehmers mit einem abgedichteten fluidsystem - Google Patents
Druckdom zur verbindung eines messwertaufnehmers mit einem abgedichteten fluidsystem Download PDFInfo
- Publication number
- WO1999037983A2 WO1999037983A2 PCT/EP1999/000438 EP9900438W WO9937983A2 WO 1999037983 A2 WO1999037983 A2 WO 1999037983A2 EP 9900438 W EP9900438 W EP 9900438W WO 9937983 A2 WO9937983 A2 WO 9937983A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- connecting element
- element according
- measuring chamber
- membrane
- holding elements
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/021—Measuring pressure in heart or blood vessels
- A61B5/0215—Measuring pressure in heart or blood vessels by means inserted into the body
Definitions
- the invention relates to a connecting element for connecting a transducer with a sealed fluid system, with at least one inlet channel, at least one outlet channel, and a measuring chamber which can be flowed through with at least one inlet channel and at least one outlet channel, the measuring chamber being formed in a housing and part of the Wall of the measuring chamber is formed by a membrane that is much more flexible than the rest of the wall of the measuring chamber.
- connecting elements are known in medical technology under the colloquial name “dome” or “pressure dome”, which results from the dome-shaped design of the measuring chamber. They serve to enable the measurement of pressures in liquids during the examination and treatment of humans and animals, preferably via electronic devices.
- a catheter with an integrated monitoring set is used for this.
- the positioning of the end opening of the catheter defines the measurement point in the patient's body.
- a monitoring set is a compilation of those parts, which are mostly intended for hygienic reasons for single use and which establish the connections between the patient and the so-called monitor.
- a monitor is the electronic monitoring and recording system with which the corresponding measurement data are evaluated and displayed, and which, if necessary, outputs corresponding alarm signals when measurement data leave predetermined target ranges.
- the monitoring set to be attached to the catheter consists of an unventilated infusion device for supplying infusion solutions to the patient, a rinsing system that ensures a continuous rinsing rate of usually 3 ml / h at the tip of the catheter to avoid occlusion by thrombi, if necessary with rapid flushing function for special cases and a pressure dome.
- the pressure dome transmits the pressure signal to a reusable transducer (pressure sensor) via its flexible membrane.
- a pressure dome was previously attached to such a transducer with a screw or bayonet connection (see DE 4219888 AI, column 3, lines 28 to 30).
- Examples of such pressure domes can be found on an information sheet "Disposable Transducer Domes" from SMP Specialty Medical Products, Dallas, Texas, US, with reference to models 078 to 082.
- a typical transducer is, for example, in a brochure from the company SensoNor as, Horten, NO, Edition 1/95, for the product SensoNor 840.
- monitoring set's Other elements of monitoring set's are the pressure hoses (color-coded) and possibly a three-way valve to be able to supply medicines, or a blood collection system for collecting blood for further investigation.
- a special problem here is to vent the parts of the monitoring set that are connected to the blood system.
- the known connecting element is made of a clear plastic.
- the measuring chamber of this connecting element is very large and in particular has a large diameter of approximately 23 mm.
- the ceiling of the measuring chamber is also the top of the housing. This ceiling and top of the housing is designed as a plano-convex magnifying lens. This is to ensure that even small air bubbles in the
- Measuring chamber can be reliably recognized by the medical nursing staff if possible.
- Disposable transducers which contain the pressure measuring sensor in a flow housing, are therefore simply tubular in the flow chamber in order to avoid this trapping of air bubbles.
- the valuable electronics are integrated in the disposable item and are therefore thrown away each time the monitoring set is changed and must be disposed of. Taking the hygiene requirements into account, such an exchange must take place every second day at the latest. This not only has the disadvantage that the still functional electronics are replaced with each change and entail corresponding costs, but also the presence of electronic components requires an additional special and thus costly treatment as electronic scrap during disposal.
- the valuable electronics, especially the pressure sensor, are located in a special housing. Such a part is usually referred to as a transducer.
- One or more transducers are integrated in a special holding plate.
- the holding plate is attached to an infusion stand, for example, using a clamping or screwing device.
- the pressure measurement data are transmitted from the transducers in the holding plate to the monitor via one or more cables.
- the transducer already disturbed the presence of the structure on the first transducer. It was not possible to place a second dome on the second transducer without removing the transducer from a common holding plate.
- the invention is therefore based on the object of providing a connecting element of the type mentioned at the outset which, on the one hand, has improved properties with regard to its reliability in relation to the application and its handling on the other.
- a connecting element of the type mentioned in the introduction in which the measuring chamber at the level of mutually opposite parts of the wall, which form an edge of the measuring chamber, in the part of the wall opposite the membrane, which forms a ceiling of the measuring chamber, each Has inlet opening and an outlet opening, and the ceiling is retracted in a central region of the measuring chamber, so that there is an annular channel-shaped part of the measuring chamber with a greater distance between the membrane and ceiling and a central area of the measuring chamber with a smaller distance between the ceiling and membrane, and the wall of the measuring chamber, with the exception of the inlet and outlet opening and the transition from the membrane to the remaining part of the wall, is formed without edges (rounded).
- the part of the measuring chamber which is in the ring channel is delimited on its outer circumference by the edge and connects the inlet opening to the outlet opening so that it can flow through.
- the ceiling in the central area is designed to be approximately dome-shaped. This applies accordingly if the edge-free part of the wall has curvatures with a radius of at least one millimeter.
- the inlet and outlet openings are approximately in a plane parallel to the membrane lie, especially if the distance of the plane in which the inlet and outlet openings are located to the membrane is not more than 3 mm.
- the cross-section through which the inlet opening can flow is larger than the cross-section through which the outlet opening can flow. This applies in particular if the width of the inlet opening is at least 90 pounds of the length of the inlet opening and / or the width of the outlet opening is not more than 2/3 of the length of the outlet opening.
- the cross-section through which the outlet channel can flow has no jumps in the cross-sectional area up to the outlet opening.
- the connecting element according to the invention in blood-carrying systems, e.g. in dialysis, it is particularly expedient if at least one inlet channel and / or at least one outlet channel is arranged inclined to a plane parallel to the membrane, in particular if the inclination of the at least one inlet channel and / or the at least one outlet channel to one parallel to the membrane Plane is approximately 15 ° to 45 °, preferably 15 ° to 30 °, particularly preferably approximately 20 °.
- the forces on cells present in the liquid can be minimized when flowing through the connection element. For example, hemolysis, i.e. bursting of the red blood cells, can be largely avoided.
- the connecting element according to the invention is characterized in that the connecting element consists of the membrane and a one-piece plastic molded part.
- the connecting element consists of the membrane and a transparent plastic injection molded part.
- a connecting element of the type mentioned at the outset in which a device for mechanically coupling the connecting element to the measuring sensor is also provided in the area of the membrane and the device is part of a snap connection.
- the device is designed for detachable mechanical coupling of the connecting element to the measuring sensor.
- the spreading connection is formed by claw-shaped holding elements for engaging in a corresponding groove or undercut of the transducer.
- the claw-shaped holding elements are connected to the housing in a resilient manner, in particular if the claw-shaped Holding elements are formed by resilient extensions of the housing.
- the claw-shaped holding elements are at least partially connected to handles for actuating the holding elements, in particular handles and associated holding elements are formed in one piece.
- a design that is particularly suitable for production is characterized in that two holding elements are formed in one piece with a handle, in particular if a total of four holding elements arranged uniformly are provided.
- sterility of the entire connecting element together with the holding elements can be established and maintained in a simple and safe manner.
- the spring-elastic connection of holding elements and handles to the housing is designed so that when actuating opposite handles up to a mutual contact none permanent damage to the elastic connection occurs. With appropriate dimensions, blind connection and removal of the connecting element is possible with one hand.
- a particularly good compromise between the cost of materials and good handling results if the handles and holding elements are dimensioned such that when the handles are actuated, there is a ratio of approximately 2: 1 to 3: 1 between the path of the free ends of the handles and the path of the holding elements results.
- the simplest application and removal of a connecting element according to the invention in monitoring sets with a plurality of transducers on a holding plate is obtained if the device for mechanically coupling the connecting element to the transducer is designed such that the connecting element is in a direction approximately perpendicular to a plane, which is spanned by at least one inlet channel and at least one outlet channel, can be placed on the sensor.
- FIG. 1 shows a side view of a connecting element according to the invention
- 2 shows a plan view of a connecting element according to the invention
- Fig. 3 shows the side view. 1 in section
- Fig. 4 shows an enlarged section from the illustration acc. Fig. 3
- 5 shows a bottom view under a connecting element according to the invention, shown without the membrane
- Fig. 6 shows a section through the connecting element according to the invention along the line A-A in Fig. 5, and
- FIG. 7 shows a representation of a further embodiment of a connecting element according to the invention corresponding to the view in FIG. 4.
- connection 1 for connecting a transducer with a sealed fluid system has a connection 1 for connection to an infusion device and a connection 2 for connection to a patient z. B. on a glued three-way valve.
- the connection 1 for connection to an infusion device has an inlet channel 3, preferably with a conical sealing seat 4.
- the connection 2 for connection to a patient contains an outlet channel 5 with an adhesive groove 6 surrounding it (FIG. 3).
- the dimensions of connections 1 and 2 preferably correspond to DIN 13090.
- a measuring chamber 7 is connected to the inlet channel 3 and the outlet channel 5 via an inlet opening 8 and an outlet opening 9 (FIG. 4), so that there is a flow path from the inlet channel 3 through the measuring chamber 7 into the outlet channel 5.
- the measuring chamber 7 is formed in a housing 10 that preferably as a one-piece injection molded part made of a transparent plastic, for. B. a polycarbonate is made. Part of the wall of the measuring chamber 7 is formed by an elastic membrane 11 (omitted in Fig. 5), for. B. from a silicone material or another suitable, resistant to the infusion solution and physiologically safe material.
- the connecting part consists only of the membrane 11 and an integral plastic injection molded part.
- a device for mechanical coupling of the connecting element to the transducer is also provided, which is part of a detachable expansion connection, which is formed by claw-shaped holding elements in the form of hooks 12 for engagement in a corresponding groove or undercut of the transducer or an associated fastening device.
- the hooks 12 are formed by resilient extensions of the housing 10 and are each formed in one piece with two each with a handle 13. A total of four evenly distributed hooks 12 are provided (FIG. 5).
- the resilient connection of hooks 12 and handles 13 to the housing 10 is designed such that when the handles 13 are pressed together, there is no permanent damage to the resilient connection until they come into contact with one another (FIG. 6). Therefore, the connecting element can be blindly assembled and disassembled with one hand by compressing the handles 13 in this way.
- Handles 13 and hooks 12 are dimensioned such that when the handles 13 are actuated, a ratio of approximately 2: 1 to 3: 1 results between the path of the free ends 14 of the handles 13 and the path of the hooks 13. As can be clearly seen in FIG. 2, the handles 13 can be pressed together
- Connection element in a direction approximately perpendicular to a plane which is spanned by the inlet channel 3 and the outlet channel 5, are placed on the transducer.
- the measuring chamber 7 is delimited radially on the outside by an edge 15 forming part of its wall, the inlet opening 8 and outlet opening 9 abutting this edge 15.
- a ceiling 16 of the measuring chamber 7 is formed by part of the wall.
- the ceiling 16 is drawn into a central region 17 of the measuring chamber 7, so that there is an annular channel-shaped part 18 of the measuring chamber 7 with a greater distance between the membrane 11 and the ceiling 16 and a central region 17 of the measuring chamber 7 with a smaller distance between the ceiling 16 and the membrane 11 results.
- the ceiling 16 is formed in the central region 17 approximately dome-shaped and the wall 15, 16 of the measuring chamber 7 with the exception of the inlet and outlet opening 8, 9 and the The transition from membrane 11 to the remaining part of the wall is rounded without edges, this rounding of the wall having curvatures with a radius of at least one millimeter.
- a groove 19 is also provided around the edge 15. To attach the membrane 11, a not shown bead of the membrane 11 is pressed into the groove 19.
- Inlet and outlet openings 8 and 9 lie approximately in a plane parallel to the membrane 11, the distance of the plane from the membrane preferably not exceeding 3 mm.
- the flow cross section of the inlet opening 8 is larger than the flow cross section of the outlet opening 9.
- the width of the inlet opening 8 is at least 90 # of the length of the inlet opening 8 and / or the width of the outlet opening 9 is not more than 2/3 of the length of the outlet opening 9.
- the cross-sectional areas of inlet and outlet openings 8 and 9 each have radii of at least half a millimeter. In order to obtain a uniform transmission of the pressure waves in the entire frequency range of interest, the flow cross section of the outlet channel 5 to the outlet opening 9 has no jumps in the cross-sectional area.
- FIG. 7 corresponds to the illustration in FIG. 4, but shows a further embodiment of the invention.
- the inlet channel and / or the outlet channel 5 is arranged inclined to a plane parallel to the membrane 11. It is advantageous if the inclination of the inlet channel 3 and / or the outlet channel 5 to a plane parallel to the membrane 11 is approximately 15 ° to 45 °, preferably 15 ° to 30 °, particularly preferably approximately 20 °.
- the forces on cells present in the liquid can be minimized when flowing through the connection element. So can be For example, avoid hemolysis as far as possible, that is, bursting of the red blood cells.
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Cardiology (AREA)
- Heart & Thoracic Surgery (AREA)
- Molecular Biology (AREA)
- Physiology (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Vascular Medicine (AREA)
- Medical Informatics (AREA)
- Physics & Mathematics (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- External Artificial Organs (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99904806A EP1049917A2 (de) | 1998-01-24 | 1999-01-23 | Druckdom zur verbindung eines messwertaufnehmers mit einem abgedichteten fluidsystem |
US09/600,825 US6725726B1 (en) | 1998-01-24 | 1999-01-23 | Pressure dome for connecting a transducer with a sealed fluid system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19802615.3 | 1998-01-24 | ||
DE19802615A DE19802615A1 (de) | 1998-01-24 | 1998-01-24 | Verbindungselement zur Verbindung eines Meßwertaufnehmers mit einem abgedichteten Fluidsystem |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/600,825 A-371-Of-International US6725726B1 (en) | 1998-01-24 | 1999-01-23 | Pressure dome for connecting a transducer with a sealed fluid system |
US10/798,607 Division US20040168530A1 (en) | 1998-01-24 | 2004-03-11 | Pressure dome for connecting a transducer with a sealed fluid system |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1999037983A2 true WO1999037983A2 (de) | 1999-07-29 |
WO1999037983A3 WO1999037983A3 (de) | 1999-11-11 |
Family
ID=7855523
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/000438 WO1999037983A2 (de) | 1998-01-24 | 1999-01-23 | Druckdom zur verbindung eines messwertaufnehmers mit einem abgedichteten fluidsystem |
Country Status (4)
Country | Link |
---|---|
US (2) | US6725726B1 (de) |
EP (1) | EP1049917A2 (de) |
DE (1) | DE19802615A1 (de) |
WO (1) | WO1999037983A2 (de) |
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WO2004098679A1 (de) | 2003-05-09 | 2004-11-18 | Mhm Harzbecher Medizintechnik Gmbh | Vorrichtung zur druckmessung |
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EP4063811A1 (de) | 2016-12-07 | 2022-09-28 | Fisher & Paykel Healthcare Limited | Kappe für eine erfassungsanordnung einer medizinischen vorrichtung |
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DE102019107604A1 (de) * | 2019-03-25 | 2020-10-01 | Fresenius Medical Care Deutschland Gmbh | Verfahren und Vorrichtung zur Überwachung der Membrankopplung bei einem Druckmesssystem |
WO2021094140A1 (en) | 2019-11-12 | 2021-05-20 | Fresenius Medical Care Deutschland Gmbh | Blood treatment systems |
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US4462409A (en) * | 1981-05-15 | 1984-07-31 | Healthdyne, Inc. | Pressure transducer dome |
US4920972A (en) * | 1987-01-27 | 1990-05-01 | Medex, Inc. | Gel-filled blood pressure transducer |
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Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
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US6880404B2 (en) | 2000-07-08 | 2005-04-19 | Mhm Harzbecher Medizintechnik Gmbh | System elements for measuring pressure in extracorporeal circuits |
WO2004098679A1 (de) | 2003-05-09 | 2004-11-18 | Mhm Harzbecher Medizintechnik Gmbh | Vorrichtung zur druckmessung |
DE102004027044A1 (de) * | 2004-06-02 | 2005-12-29 | Mhm Harzbecher Medizintechnik Gmbh | Vorrichtung und Verfahren zum Betrieb eines Patientenmonitors |
EP1658869A1 (de) | 2004-11-17 | 2006-05-24 | Fresenius Medical Care Deutschland GmbH | Membraneinheit, Gehäuse einer Druckmesseinheit und Druckmesseinheit |
US7603907B2 (en) | 2004-11-17 | 2009-10-20 | Fresenius Medical Care Deutschland Gmbh | Membrane unit, housing of a pressure measuring unit and pressure measuring unit |
US7921723B2 (en) | 2004-11-17 | 2011-04-12 | Fresenius Medical Care Deutschland Gmbh | Membrane unit, housing of a pressure measuring unit and pressure measuring unit |
DE102008015322A1 (de) | 2008-03-20 | 2009-09-24 | Mhm Harzbecher Medizintechnik Gmbh | Verbindungselement zur Verbindung eines Meßwertaufnehmers mit einem abgedichteten Fluidsystem |
US9435706B2 (en) * | 2010-04-30 | 2016-09-06 | Fresenius Medical Care Deutschland Gmbh | Membrane for a pressure dome |
US20150338302A1 (en) * | 2010-04-30 | 2015-11-26 | Fresenius Medical Care Deutschland Gmbh | Membrane for a pressure dome |
US9062785B2 (en) | 2010-05-07 | 2015-06-23 | Otto Bock Healthcare Gmbh | Valve arrangement with a base part and an insert part |
DE102010020068A1 (de) * | 2010-05-07 | 2011-11-10 | Otto Bock Healthcare Gmbh | Ventilanordnung mit einem Basisteil und einem Einsatzteil |
WO2014135456A1 (de) * | 2013-03-04 | 2014-09-12 | Andromeda Medizinische Systeme Gmbh | Vorrichtung zur druckmessung in einem fluid |
CN105163665A (zh) * | 2013-03-04 | 2015-12-16 | 安多美达医疗系统有限公司 | 用于在流体中测量压力的装置 |
CN105163665B (zh) * | 2013-03-04 | 2019-05-07 | 安多美达医疗系统有限公司 | 用于在流体中测量压力的装置 |
US11627901B2 (en) | 2013-03-04 | 2023-04-18 | Medical Measurement Systems B.V. | Device for measuring pressure in a fluid |
WO2020020480A1 (de) | 2018-07-27 | 2020-01-30 | EMKA Medical GmbH | Drucksensoreinrichtung für medizinische in vivo anwendung |
Also Published As
Publication number | Publication date |
---|---|
US6725726B1 (en) | 2004-04-27 |
US20040168530A1 (en) | 2004-09-02 |
EP1049917A2 (de) | 2000-11-08 |
DE19802615A1 (de) | 1999-08-12 |
WO1999037983A3 (de) | 1999-11-11 |
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