EP2175924A1 - Nonreturn valve, in particular for medical uses - Google Patents

Nonreturn valve, in particular for medical uses

Info

Publication number
EP2175924A1
EP2175924A1 EP08785052A EP08785052A EP2175924A1 EP 2175924 A1 EP2175924 A1 EP 2175924A1 EP 08785052 A EP08785052 A EP 08785052A EP 08785052 A EP08785052 A EP 08785052A EP 2175924 A1 EP2175924 A1 EP 2175924A1
Authority
EP
European Patent Office
Prior art keywords
support
connection housing
hose connection
valve seat
check valve
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Withdrawn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
EP08785052A
Other languages
German (de)
French (fr)
Inventor
Colm Carmody
Kieran Costello
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.)
Filtertek BV
Original Assignee
Filtertek BV
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 Filtertek BV filed Critical Filtertek BV
Publication of EP2175924A1 publication Critical patent/EP2175924A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/14—Check valves with flexible valve members
    • F16K15/144—Check valves with flexible valve members the closure elements being fixed along all or a part of their periphery
    • 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
    • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
    • A61M39/22—Valves or arrangement of valves
    • A61M39/24—Check- or non-return valves
    • 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
    • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
    • A61M39/22—Valves or arrangement of valves
    • A61M39/24—Check- or non-return valves
    • A61M2039/2433—Valve comprising a resilient or deformable element, e.g. flap valve, deformable disc
    • 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
    • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
    • A61M39/22—Valves or arrangement of valves
    • A61M39/24—Check- or non-return valves
    • A61M2039/2433—Valve comprising a resilient or deformable element, e.g. flap valve, deformable disc
    • A61M2039/2446—Flexible disc
    • A61M2039/246—Flexible disc being fixed along all or a part of its periphery
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7838—Plural
    • Y10T137/7839—Dividing and recombining in a single flow path
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7879—Resilient material valve

Definitions

  • the invention relates to a check valve, fertilize in particular for medical applications, with a first hose connection housing and a second hose connection housing and arranged between the two hose connection housing membrane disc of flexible material which at positive pressure in an input channel of the first hose connection housing of an annular, one with the input channel
  • the valve seat can be lifted off at an overflow in an outlet channel of the second hose connection housing and can be pressed onto the valve seat in minimal time, wherein the membrane disk is provided at its outer circumferential area with an annular bead which is located in mutually opposite annular grooves of the hose connection housing is received, the diaphragm disc is provided radially outwardly of the valve seat with openings leading to an outlet space and wherein the openings of the opposite wall of the z wide hose connection housing is provided with associated with the outlet channel recesses, which are separated by support surfaces for the membrane disc and are connected by narrow deep grooves with the outlet channel.
  • check valve is known from an earlier proposal of the applicant from DE-GM 20 2006 016 730.7.
  • Such medical check valves are needed in infusion systems, diagnostic equipment, intravenous tubing, and the like, such that such check valves must close very safely and the closing time must be only fractions of seconds, thereby eliminating any backflow of liquids contaminated with undesirable substances.
  • the manufacture must not only be extremely economical, but also statistically very accurate, since such valves can be used exclusively for medical applications as disposable articles and therefore have to be manufactured in an automated manner in very large numbers for cost reasons.
  • a valve of the type mentioned above improves a check valve, which is known from another earlier proposal of the applicant from DE-GM 20 2004 009 358.8, whereby it is achieved that it can no longer occur at higher pressures on the input side of the valve the openings provided in the membrane can create due to this pressure to the opposite wall of the outlet and thus closes the valve unintentionally.
  • This is achieved by the numerous support surfaces between the recesses, which ensure that, in any case, in the region of the openings in the membrane disk, a connection to the starting space is maintained, even if the membrane disk should rest completely against the support surfaces.
  • the object of the present invention is again to improve this valve of the type mentioned above with regard to high pressures and completely exclude damage or overstretching of the membrane disk.
  • this object is essentially achieved in that the support surfaces and the grooves in the middle of a projecting in the direction of the membrane disc, essentially flat support ends.
  • the advantage is achieved that in the most sensitive to overstretching region of the membrane disc is additionally centrally supported on the support at high pressures, so that overstretching in the direction of the recesses between the support surfaces can be excluded.
  • the support is circular. As a result, particularly favorable conditions are created with respect to the symmetry.
  • the membrane disc is provided with a protruding integral reinforcement.
  • the diaphragm touches the support in the outlet of the non-return valve. After relieving the pressure, it may happen that the membrane becomes snug on the support and delays the closing of the valve.
  • the ribs prevent sticking and thus help to close the valve as quickly as possible.
  • the invention can be further developed in that the circumference of the support is arranged within the radius of the opposite valve seat. This ensures a particularly trouble-free operation of the valve.
  • FIGURE 1 is a schematic sectional view in the plane of the grooves of an embodiment of the check valve according to the invention in the open state;
  • FIG. 2 a sectional view corresponding to FIG. 1 in the plane of the support surfaces of the valve according to FIG. 1 in the closed state, and
  • FIG. 1 is a schematic sectional view in the plane of the grooves of an embodiment of the check valve according to the invention in the open state;
  • FIG. 2 a sectional view corresponding to FIG. 1 in the plane of the support surfaces of the valve according to FIG. 1 in the closed state, and
  • FIGURE 1 is a schematic sectional view in the plane of the grooves of an embodiment of the check valve according to the invention in the open state;
  • FIG. 2 a sectional view corresponding to FIG. 1 in the plane of the support surfaces of the valve according to FIG. 1 in the closed state, and
  • FIG. 1 is a schematic sectional view in the plane of the grooves of an embodiment of the check valve according to the invention in the open state;
  • FIG. 2
  • FIGURE 3 is a perspective view of the hose connecting housing containing the support surfaces, which forms the output side of the valve.
  • the check valve 1 shown greatly enlarged in the drawings is particularly suitable for medical technology and can be used, for example, in pressure differences down to 0.002 bar.
  • the check valve 1 consists of a first hose connection housing 2 and a second hose connection housing 4, which are preferably made of a plastic by spraying. Between the two hose connection housings 2 and 4, a membrane disk 6 is arranged, which is made of a flexible plastic, for example silicone.
  • An input channel 8, which opens into an input space 10, is formed in the first hose connection housing 2.
  • the input space 10 surrounds an annular valve seat 12, against which the membrane disk 6 is biased.
  • the membrane disk is formed with a continuously closed central part, which makes it possible that considerable tensile forces can be transmitted radially from the inside to the outside and vice versa.
  • the membrane disk 6 is provided with an integrally formed annular bead 14, which is produced, for example, by injection molding on the membrane disk 6.
  • the first hose connection housing 2 contains an annular groove 16 in its end face, which faces an annular groove 18 in the second hose connection housing in the assembled state.
  • the annular bead 14 is received during the assembly of the two hose connection housing 2 and 4 in the mutually opposite annular grooves 16 and 18 and thereby simultaneously biased against the valve seat 12. As can be seen from FIGS.
  • the membrane disk 6 has, radially outside the valve seat 12, openings 20 which are arranged on a radius which allows an annular space 21 located radially outside the valve seat 12 in the first hose connection housing 2 to have an outlet space 22 is connected in the second hose connection housing 4, wherein the outlet space 22 is in communication with the outlet channel 24 of the second hose connection housing 4.
  • the recesses 28 are separated from each other by support surfaces 30 for the membrane disk 6, wherein the recesses 28 are connected by narrow deep grooves 32 with the outlet channel 24.
  • the support surfaces 30 and the grooves 32 in the middle terminate at a support 50 projecting in the direction of the membrane disk 6, which has a substantially flat surface.
  • the support 50 is circular in shape, although other shapes are also possible.
  • the membrane disc 6 has a reinforcement 52, which in the drawing on the opposite side of the support 50 projects in the direction of the support 50, but may also lie on the other side of the membrane disc 6.
  • the protruding reinforcement 52 is likewise integrally formed with the membrane disk 6, for example by injection molding.
  • small ribs 56 are formed, which project beyond the surface 54 of the support 50 and lead to the outer periphery of the support 50. In the illustrated embodiment, the ribs 56 are extended into the support surfaces 30.
  • the ribs 56 intersect in a star shape in the center of the support 50. Further, the circumference of the support 50 is within the radius of the opposite valve seat 12th
  • overstretched membranes of this type tend to rapidly return to their original shape due to the hysteresis effect.
  • the construction of the present invention ensures support of the membrane and thereby prevents its overstretching at the relevant pressures. This feature therefore ensures rapid closure of the valve while relieving pressure.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • General Engineering & Computer Science (AREA)
  • Hematology (AREA)
  • Biomedical Technology (AREA)
  • Anesthesiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Pulmonology (AREA)
  • Mechanical Engineering (AREA)
  • Check Valves (AREA)

Abstract

Nonreturn valve (1), in particular for medical uses, with a first tube connection housing (2) and a second tube connection housing (4) and, arranged between the two tube connection housings (2, 4), a diaphragm disc (6) which is made of flexible material and which can be lifted from an annular valve seat (12) when there is an overpressure in an inlet channel (8) and can be pressed onto the valve seat (12) when there is an overpressure in an outlet channel (24). At its outer peripheral area, the diaphragm disc (6) is provided with an annular bead (14) which is received in mutually opposite annular grooves (16, 18) of the tube connection housings (2, 4). The diaphragm disc (6) is provided, radially outside the valve seat (12), with openings (20) leading to an outlet chamber (22), and the wall (26) of the second tube connection housing (4) lying opposite the openings (20) is provided with recesses (28) which communicate with the outlet channel (24), are separated from each other by supporting surfaces (30) for the diaphragm disc (6) and are connected to the outlet channel (24) by narrow deep grooves (32). The supporting surfaces (30) and the grooves (32) end at the centre in a substantially plane support (50) that protrudes in the direction of the diaphragm disc (6).

Description

Rückschlagventil, insbesondere für medizinische Anwendungen. Check valve, in particular for medical applications.
Die Erfindung betrifft ein Rückschlagventil, insbesondere für medizinische Anwen- düngen, mit einem ersten Schlauchanschlussgehäuse und einem zweiten Schlauchanschlussgehäuse und einer zwischen den beiden Schlauchanschlussgehäusen angeordneten Membranscheibe aus flexiblem Werkstoff, welche bei Überdruck in einem Eingangskanal des ersten Schlauchanschlussgehäuses von einem ringförmigen, einen mit dem Eingangskanal verbundenen Einlassraum um- gebenden Ventilsitz abhebbar ist und die bei Überdruck in einem Auslasskanal des zweiten Schlauchanschlussgehäuses sicher und in Minimalzeiten auf den Ventilsitz andrückbar ist, wobei die Membranscheibe an ihrem äußeren Umfangs- bereich mit einem Ringwulst versehen ist, der in einander gegenüberliegenden Ringnuten der Schlauchanschlussgehäuse aufgenommen ist, die Membranschei- be radial außerhalb des Ventilsitzes mit zu einem Auslassraum führenden Öffnungen versehen ist und wobei die den Öffnungen gegenüberliegende Wandung des zweiten Schlauchanschlussgehäuses mit mit dem Auslasskanal in Verbindung stehenden Ausnehmungen versehen ist, welche durch Stützflächen für die Membranscheibe voneinander getrennt sind und durch schmale tiefe Nuten mit dem Auslasskanal verbunden sind.The invention relates to a check valve, fertilize in particular for medical applications, with a first hose connection housing and a second hose connection housing and arranged between the two hose connection housing membrane disc of flexible material which at positive pressure in an input channel of the first hose connection housing of an annular, one with the input channel The valve seat can be lifted off at an overflow in an outlet channel of the second hose connection housing and can be pressed onto the valve seat in minimal time, wherein the membrane disk is provided at its outer circumferential area with an annular bead which is located in mutually opposite annular grooves of the hose connection housing is received, the diaphragm disc is provided radially outwardly of the valve seat with openings leading to an outlet space and wherein the openings of the opposite wall of the z wide hose connection housing is provided with associated with the outlet channel recesses, which are separated by support surfaces for the membrane disc and are connected by narrow deep grooves with the outlet channel.
Ein derartiges Rückschlagventil ist nach einem früheren Vorschlag der Anmelderin aus dem DE-GM 20 2006 016 730.7 bekannt.Such a check valve is known from an earlier proposal of the applicant from DE-GM 20 2006 016 730.7.
Derartige Rückschlagventile für die Medizintechnik werden in Infusionssystemen, Diagnosegeräten, intravenösen Schlauchleitungen und dergleichen benötigt, so dass derartige Rückschlagventile sehr sicher schließen müssen und die Schließzeit nur Bruchteile von Sekunden betragen darf, um dadurch jeglichen Rückfluss von mit unerwünschten Stoffen belasteten Flüssigkeiten zu vermeiden. Ferner muss gleichzeitig die Herstellung nicht nur extrem wirtschaftlich, sondern statistisch auch sehr genau sein, da derartige Ventile für medizinische Anwendungen ausschließlich als Einwegartikel verwendet werden können und folglich aus Kos- tengründen in automatisierter Weise in sehr großen Stückzahlen hergestellt werden müssen. Gleichzeitig bestehen sehr strenge gesetzliche Vorschriften hinsichtlich einer gleich bleibenden und einheitlichen Funktionssicherheit, was beispielsweise in Deutschland durch den Technischen Überwachungsverein genau überwacht wird.Such medical check valves are needed in infusion systems, diagnostic equipment, intravenous tubing, and the like, such that such check valves must close very safely and the closing time must be only fractions of seconds, thereby eliminating any backflow of liquids contaminated with undesirable substances. Furthermore, at the same time, the manufacture must not only be extremely economical, but also statistically very accurate, since such valves can be used exclusively for medical applications as disposable articles and therefore have to be manufactured in an automated manner in very large numbers for cost reasons. At the same time, there are very strict legal requirements with regard to consistent and uniform functional reliability, which is closely monitored, for example, in Germany by the Technical Inspection Association.
Ein Ventil der oben erwähnten Gattung verbessert ein Rückschlagventil, welches nach einem anderen früheren Vorschlag der Anmelderin aus dem DE-GM 20 2004 009 358.8 bekannt ist, wobei erreicht wird, dass es bei höheren Drücken auf der Eingangsseite des Ventils nicht mehr vorkommen kann, dass die in der Membran vorgesehenen Öffnungen sich aufgrund dieses Überdrucks an die gegenüberliegende Wandung des Auslassraums anlegen können und somit das Ventil unbeabsichtigt schließt. Dies wird durch die zahlreichen Stützflächen zwischen den Ausnehmungen erreicht, welche dafür Sorge tragen, dass auf jeden Fall im Bereich der Öffnungen in der Membranscheibe eine Verbindung zum Aus- gangsraum erhalten bleibt, selbst wenn sich die Membranscheibe vollständig an die Stützflächen anlegen sollte.A valve of the type mentioned above improves a check valve, which is known from another earlier proposal of the applicant from DE-GM 20 2004 009 358.8, whereby it is achieved that it can no longer occur at higher pressures on the input side of the valve the openings provided in the membrane can create due to this pressure to the opposite wall of the outlet and thus closes the valve unintentionally. This is achieved by the numerous support surfaces between the recesses, which ensure that, in any case, in the region of the openings in the membrane disk, a connection to the starting space is maintained, even if the membrane disk should rest completely against the support surfaces.
Gegenstand der vorliegenden Erfindung ist es, dieses Ventil der eingangs genannten Art nochmals hinsichtlich hoher Drücke zu verbessern und Beschädigun- gen oder Überdehnungen der Membranscheibe vollständig auszuschließen.The object of the present invention is again to improve this valve of the type mentioned above with regard to high pressures and completely exclude damage or overstretching of the membrane disk.
Bei einem Rückschlagventil der eingangs genannten Art wird diese Aufgabe im wesentlichen dadurch gelöst, dass die Stützflächen und die Nuten in der Mitte an einer in Richtung der Membranscheibe vorstehenden, im wesentlichen ebene Stütze enden. Hierdurch wird der Vorteil erzielt, dass im gegen Überdehnungen empfindlichsten Bereich der Membranscheibe diese bei hohen Drücken zusätzlich zentral auf der Stütze abgestützt wird, so dass eine Überdehnung in Richtung der Ausnehmungen zwischen den Stützflächen ausgeschlossen werden kann. Bei einer bevorzugten Ausführungsform nach der Erfindung ist die Stütze kreisförmig ausgebildet. Hierdurch werden besonders günstige Bedingungen hinsichtlich der Symmetrie geschaffen.In a check valve of the type mentioned, this object is essentially achieved in that the support surfaces and the grooves in the middle of a projecting in the direction of the membrane disc, essentially flat support ends. In this way, the advantage is achieved that in the most sensitive to overstretching region of the membrane disc is additionally centrally supported on the support at high pressures, so that overstretching in the direction of the recesses between the support surfaces can be excluded. In a preferred embodiment of the invention, the support is circular. As a result, particularly favorable conditions are created with respect to the symmetry.
Bei einer besonders bevorzugten Ausführungsform nach der Erfindung ist die Membranscheibe mit einer vorstehenden einstückigen Verstärkung versehen. Hierdurch wird eine besonders sichere Abstützung der Membranscheibe bei hohen Drücken erreicht, ohne dass diese an der Anlagefläche an der Stütze über- mäßig verschleißen kann.In a particularly preferred embodiment of the invention, the membrane disc is provided with a protruding integral reinforcement. As a result, a particularly secure support of the membrane disk is achieved at high pressures, without these being able to excessively wear on the contact surface on the support.
Bevorzugt ist es ferner, in der Oberfläche der Stütze kleine, zu deren Außenumfang führende Rippen auszubilden. Hierdurch wird eine zusätzliche Medien führende Verbindung über den Querschnitt der Stütze geschaffen.It is also preferable to form small ribs leading to the outer circumference thereof in the surface of the support. As a result, an additional media leading connection is created over the cross section of the support.
Bevorzugt ist es hierbei, die Rippen sternförmig in der Mitte der Stütze kreuzend anzuordnen, wobei insbesondere drei derartige Rippen besonders bevorzugt sind.It is preferred in this case to arrange the ribs crossing in a star shape in the middle of the support, wherein in particular three such ribs are particularly preferred.
Bei hohen Drücken berührt die Membrane die Stütze im Ausgang des Rück- schlagventils. Nach Entlasten des Drucks kann es vorkommen, dass sich die Membrane an der Stütze festsaugt und das Schließen des Ventils verzögert. Die Rippen verhindern das Festsaugen und tragen folglich dazu bei, dass sich das Ventil schnellstmöglich schließt.At high pressures, the diaphragm touches the support in the outlet of the non-return valve. After relieving the pressure, it may happen that the membrane becomes snug on the support and delays the closing of the valve. The ribs prevent sticking and thus help to close the valve as quickly as possible.
Im Einzelnen kann die Erfindung dadurch weitergebildet werden, dass der Umfang der Stütze innerhalb des Radius des gegenüberliegenden Ventilsitzes angeordnet ist. Hierdurch wird ein besonders störungsfreier Betrieb des Ventils gewährleistet.In detail, the invention can be further developed in that the circumference of the support is arranged within the radius of the opposite valve seat. This ensures a particularly trouble-free operation of the valve.
Im Folgenden wird die Erfindung an Hand einer in den Zeichnungen beispielhaft veranschaulichten Ausführungsform näher erläutert. Es zeigt:In the following the invention will be explained in more detail with reference to an embodiment exemplified in the drawings. It shows:
FIGUR 1 eine schematische Schnittansicht in der Ebene der Nuten einer Ausführungsform des Rückschlagventils nach der Erfindung im geöffneten Zustand; FIGUR 2 eine Figur 1 entsprechende Schnittansicht in der Ebene der Stützflächen des Ventils gemäß Figur 1 im geschlossenen Zustand, undFIGURE 1 is a schematic sectional view in the plane of the grooves of an embodiment of the check valve according to the invention in the open state; FIG. 2 a sectional view corresponding to FIG. 1 in the plane of the support surfaces of the valve according to FIG. 1 in the closed state, and FIG
FIGUR 3 eine perspektivische Ansicht des die Stützflächen enthaltenden Schlauchanschlussgehäuses, welches die Ausgangsseite des Ventils bildet.FIGURE 3 is a perspective view of the hose connecting housing containing the support surfaces, which forms the output side of the valve.
Das in den Zeichnungen stark vergrößert dargestellte Rückschlagventil 1 ist insbesondere für die Medizintechnik geeignet und kann beispielsweise bei Druckun- terschieden bis herunter zu 0,002 bar eingesetzt werden. Das Rückschlagventil 1 besteht aus einem ersten Schlauchanschlussgehäuse 2 und einem zweiten Schlauchanschlussgehäuse 4, die bevorzugt aus einem Kunststoff durch Spritzen hergestellt sind. Zwischen den beiden Schlauchanschlussgehäusen 2 und 4 ist eine Membranscheibe 6 angeordnet, die aus einem flexiblen Kunststoff, bei- spielsweise Silikon, hergestellt ist.The check valve 1 shown greatly enlarged in the drawings is particularly suitable for medical technology and can be used, for example, in pressure differences down to 0.002 bar. The check valve 1 consists of a first hose connection housing 2 and a second hose connection housing 4, which are preferably made of a plastic by spraying. Between the two hose connection housings 2 and 4, a membrane disk 6 is arranged, which is made of a flexible plastic, for example silicone.
Ein Eingangskanal 8, der in einem Eingangsraum 10 mündet, ist in dem ersten Schlauchanschlussgehäuse 2 ausgebildet. Den Eingangsraum 10 umgibt ein ringförmiger Ventilsitz 12, gegen welchen die Membranscheibe 6 vorgespannt ist.An input channel 8, which opens into an input space 10, is formed in the first hose connection housing 2. The input space 10 surrounds an annular valve seat 12, against which the membrane disk 6 is biased.
Die Membranscheibe ist mit einem durchgehend geschlossenen Mittelteil ausgebildet, der es ermöglicht, dass erhebliche Zugkräfte radial von innen nach außen und umgekehrt übertragen werden können. An ihrem äußeren Umfangsbereich ist die Membranscheibe 6 mit einem einstückig ausgebildeten Ringwulst 14 verse- hen, welcher beispielsweise durch Spritzgießen an der Membranscheibe 6 hergestellt ist. Das erste Schlauchanschlussgehäuse 2 enthält eine Ringnut 16 in seiner Stirnfläche, der eine Ringnut 18 im zweiten Schlauchanschlussgehäuse im zusammengebauten Zustand gegenüberliegt. Der Ringwulst 14 wird beim Zusammenbau der beiden Schlauchanschlussgehäuse 2 und 4 in den einander gegenü- berliegenden Ringnuten 16 und 18 aufgenommen und hierbei gleichzeitig gegen den Ventilsitz 12 vorgespannt. Wie aus den Figuren 1 und 2 ersichtlich, weist clie Membranscheibe 6 radial außerhalb des Ventilsitzes 12 Öffnungen 20 auf, die auf einem Radius angeordnet sind, der es ermöglicht, dass ein radial außerhalb des Ventilsitzes 12 liegender Ringraum 21 im ersten Schlauchanschlussgehäuse 2 mit einem Auslassraum 22 im zweiten Schlauchanschlussgehäuse 4 verbunden wird, wobei der Auslassraum 22 mit dem Auslasskanal 24 des zweiten Schlauchanschlussgehäuses 4 in Verbindung steht.The membrane disk is formed with a continuously closed central part, which makes it possible that considerable tensile forces can be transmitted radially from the inside to the outside and vice versa. At its outer peripheral region, the membrane disk 6 is provided with an integrally formed annular bead 14, which is produced, for example, by injection molding on the membrane disk 6. The first hose connection housing 2 contains an annular groove 16 in its end face, which faces an annular groove 18 in the second hose connection housing in the assembled state. The annular bead 14 is received during the assembly of the two hose connection housing 2 and 4 in the mutually opposite annular grooves 16 and 18 and thereby simultaneously biased against the valve seat 12. As can be seen from FIGS. 1 and 2, the membrane disk 6 has, radially outside the valve seat 12, openings 20 which are arranged on a radius which allows an annular space 21 located radially outside the valve seat 12 in the first hose connection housing 2 to have an outlet space 22 is connected in the second hose connection housing 4, wherein the outlet space 22 is in communication with the outlet channel 24 of the second hose connection housing 4.
In einer den Öffnungen 20 in der Membranscheibe gegenüberliegenden Wandung des Auslassraums 22 sind allgemein mit 28 bezeichnete Ausnehmungen vorgesehen, welche gleichzeitig den Öffnungen 20 gegenüberliegen.In one of the openings 20 in the membrane disc opposite wall of the outlet space 22 generally designated 28 recesses are provided, which are opposite to the openings 20 at the same time.
Die Ausnehmungen 28 sind durch Stützflächen 30 für die Membranscheibe 6 voneinander getrennt, wobei die Ausnehmungen 28 durch schmale tiefe Nuten 32 mit dem Auslasskanal 24 verbunden sind.The recesses 28 are separated from each other by support surfaces 30 for the membrane disk 6, wherein the recesses 28 are connected by narrow deep grooves 32 with the outlet channel 24.
Die Stützflächen 30, welche sich in Richtung des Außenrandes des Auslassraums 22 verbreitern und bis zu diesem Außenrand reichen, bilden eine größtmögliche Anlage für die Membranscheibe 6 bei hohen Drücken.The support surfaces 30, which widen in the direction of the outer edge of the outlet space 22 and extend to this outer edge, form the largest possible contact for the membrane disk 6 at high pressures.
Bei der in den Zeichnungen veranschaulichten Ausführungsform enden die Stützflächen 30 und die Nuten 32 in der Mitte an einer in Richtung der Membranscheibe 6 vorstehenden Stütze 50, welche eine im wesentlichen ebene Oberfläche aufweist. Bei dem veranschaulichten Ausführungsbeispiel ist die Stütze 50 kreis- förmig ausgebildet, obwohl andere Formen ebenfalls möglich sind.In the embodiment illustrated in the drawings, the support surfaces 30 and the grooves 32 in the middle terminate at a support 50 projecting in the direction of the membrane disk 6, which has a substantially flat surface. In the illustrated embodiment, the support 50 is circular in shape, although other shapes are also possible.
Die Membranscheibe 6 weist eine Verstärkung 52 auf, welche in der Zeichnung auf der der Stütze 50 gegenüberliegenden Seite in Richtung der Stütze 50 vorsteht, jedoch auch auf der anderen Seite der Membranscheibe 6 liegen kann. Die vorstehende Verstärkung 52 ist mit der Membranscheibe 6, beispielsweise durch Spritzgießen, ebenfalls einstückig ausgebildet. Wie aus der Ansicht gemäß Figur 3 ersichtlich, sind auf der Oberfläche 54 der Stütze 50 zusätzlich kleine Rippen 56 ausgebildet, welche über die Oberfläche 54 der Stütze 50 vorstehen und zum Äußenumfang der Stütze 50 führen. Bei dem veranschaulichten Ausführungsbeispiel sind die Rippen 56 bis in die Stützflächen 30 hinein verlängert.The membrane disc 6 has a reinforcement 52, which in the drawing on the opposite side of the support 50 projects in the direction of the support 50, but may also lie on the other side of the membrane disc 6. The protruding reinforcement 52 is likewise integrally formed with the membrane disk 6, for example by injection molding. As can be seen in the view of Figure 3, on the surface 54 of the support 50 in addition small ribs 56 are formed, which project beyond the surface 54 of the support 50 and lead to the outer periphery of the support 50. In the illustrated embodiment, the ribs 56 are extended into the support surfaces 30.
Die Rippen 56, von denen beim Ausführungsbeispiel drei Stück vorgesehen sind, kreuzen sich sternförmig in der Mitte der Stütze 50. Ferner liegt der Umfang der Stütze 50 innerhalb des Radius des gegenüberliegenden Ventilsitzes 12.The ribs 56, of which three are provided in the embodiment, intersect in a star shape in the center of the support 50. Further, the circumference of the support 50 is within the radius of the opposite valve seat 12th
Sollte nun bei der dargestellten Ausführungsform im Eingangskanal 8 ein starker Überdruck herrschen, aufgrund dessen die Membranscheibe 6 in unerwünschter Weise gegen die Wandung 26 gedrückt würde, so gelangt zunächst die Verstärkung 52 oder deren Rückseite, falls diese unterhalb der Membrane liegt, zur AnIa- ge an die Stütze 50, so dass die Membranscheibe 6 zusätzlich in der Mitte abgestützt wird. Sollte der Druck weiterhin zu groß sein, wird anschließend die Membranscheibe sich gegen die Stützflächen 30 legen, so dass keine übergroße Dehnung oder Verformung der Membranscheibe auftritt.If, in the illustrated embodiment, a strong overpressure prevails in the input channel 8, as a result of which the membrane disk 6 would undesirably be pressed against the wall 26, the reinforcement 52 or its rear side, if it lies below the membrane, first of all comes to rest to the support 50, so that the membrane disk 6 is additionally supported in the middle. Should the pressure continue to be too great, then the membrane disc will lay against the support surfaces 30, so that no excessive stretching or deformation of the membrane disc occurs.
Überdehnte Membrane dieser Art zeigen nämlich die Neigung, wegen des Hysterese-Effekts nicht schnell wieder ihre ursprüngliche Form anzunehmen. Die Konstruktion nach vorliegender Erfindung gewährleistet eine Abstützung der Membrane und verhindert dadurch deren Überdehnung bei den relevanten Drücken. Dieses Merkmal stellt daher ein schnelles Schließen des Ventils bei Entlastung des Drucks sicher.In fact, overstretched membranes of this type tend to rapidly return to their original shape due to the hysteresis effect. The construction of the present invention ensures support of the membrane and thereby prevents its overstretching at the relevant pressures. This feature therefore ensures rapid closure of the valve while relieving pressure.
Sämtliche aus der Beschreibung, den Ansprüchen und Zeichnungen hervorgehenden Merkmale und Vorteile der Erfindung, einschließlich konstruktiver Einzelheiten und räumlicher Anordnungen, können sowohl für sich als auch in beliebiger Kombination erfindungswesentlich sein. BEZUGSZEICHENLISTEAll features and advantages of the invention, including design details and spatial arrangements, which emerge from the description, the claims and the drawings, can be essential to the invention both individually and in any desired combination. LIST OF REFERENCE NUMBERS
1 = Rückschlagventil1 = check valve
2 = erstes Schlauchanschlussgehäuse 4 = zweites Schlauchanschlussgehäuse 6 = Membranscheibe2 = first hose connection housing 4 = second hose connection housing 6 = membrane disk
8 = Eingangskanal8 = input channel
10 = Einlassraum10 = inlet space
12 = Ventilsitz12 = valve seat
14 = Ringwulst14 = annular bead
16 = Ringnut16 = annular groove
18 = Ringnut18 = annular groove
20 = Öffnung20 = opening
21 = Ringraum21 = annulus
22 = Auslassraum 24 = Auslasskanal 26 = Wandung22 = outlet space 24 = outlet channel 26 = wall
28 = Ausnehmung28 = recess
30 = Stützfläche30 = support surface
32 = Nut32 = groove
50 = Stütze50 = support
52 = Verstärkung52 = gain
54 = Oberfläche v. 5054 = surface v. 50
56 = Rippen 56 = ribs

Claims

PATENTANSPRÜCHE
1. Rückschlagventil, insbesondere für medizinische Anwendungen, mit einem ersten Schlauchanschlussgehäuse und einem zweiten Schlauchanschlussgehäuse und einer zwischen den beiden Schlauchanschlussgehäusen angeordneten Membranscheibe aus flexiblem Werkstoff, welche bei Überdruck in einem Eingangskanal des ersten Schlauchanschlussgehäuses von einem ringförmigen, ei- nen mit dem Eingangskanal verbundenen Einlassraum umgebenden Ventilsitz abhebbar ist und die bei Überdruck in einem Auslasskanal des zweiten Schlauchanschlussgehäuses sicher und in Minimalzeiten auf den Ventilsitz andrückbar ist, wobei die Membranscheibe an ihrem äußeren Umfangsbereich mit einem Ringwulst versehen ist, der in einander gegenüberliegenden Ringnuten der Schlauch- anschlussgehäuse aufgenommen ist, die Membranscheibe radial außerhalb des Ventilsitzes mit zu einem Auslassraum führenden Öffnungen versehen ist und wobei die den Öffnungen gegenüberliegende Wandung des zweiten Schlauchanschlussgehäuses mit mit dem Auslasskanal in Verbindung stehenden Ausnehmungen versehen ist, welche durch Stützflächen für die Membranscheibe vonein- ander getrennt sind und durch schmale tiefe Nuten mit dem Auslasskanal verbunden sind, dadurch gekennzeichnet, dass die Stützflächen (30) und die Nuten (32) in der Mitte an einer in Richtung der Membranscheibe (6) vorstehenden, im wesentlichen ebenen Stütze (50) enden.1. A check valve, in particular for medical applications, comprising a first hose connection housing and a second hose connection housing and a membrane of flexible material disposed between the two hose connection housings, which in case of overpressure in an inlet channel of the first hose connection housing of an annular, an inlet channel connected to the input channel the surrounding valve seat is lifted and the pressure in an outlet of the second hose connection housing is pressed securely and in minimum time on the valve seat, the diaphragm disc is provided at its outer peripheral portion with an annular bead which is received in opposing annular grooves of the hose connection housing, the Membrane disc is provided radially outwardly of the valve seat with leading to an outlet space openings and wherein the openings opposite the wall of the second Schlauchanschlussgehä is used with associated with the outlet channel recesses, which are separated by support surfaces for the membrane disc from each other and connected by narrow deep grooves with the outlet channel, characterized in that the support surfaces (30) and the grooves (32) in the center of a projecting in the direction of the membrane disc (6) projecting, substantially flat support (50).
2. Rückschlagventil nach Anspruch 1 , dadurch gekennzeichnet, dass die Stütze (50) kreisförmig ausgebildet ist.2. Check valve according to claim 1, characterized in that the support (50) is circular.
3. Rückschlagventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Membranscheibe (6) mit einer mittigen vorstehenden Verstärkung (52) versehen ist. 3. Check valve according to claim 1 or 2, characterized in that the membrane disc (6) is provided with a central projecting reinforcement (52).
4. Rückschlagventil nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass in der Oberfläche (54) der Stütze (50) kleine, zu deren Außenumfang führende Rippen (56) ausgebildet sind.4. Check valve according to one of the preceding claims, characterized in that in the surface (54) of the support (50) small, leading to the outer periphery ribs (56) are formed.
5. Rückschlagventil nach Anspruch 4, dadurch gekennzeichnet, dass die Kanäle (56) sich sternförmig in der Mitte der Stütze (50) kreuzend angeordnet sind.5. Check valve according to claim 4, characterized in that the channels (56) are arranged in a star shape in the middle of the support (50) crossing each other.
6. Rückschlagventil nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass drei Rippen (56) vorgesehen sind.6. Non-return valve according to claim 4 or 5, characterized in that three ribs (56) are provided.
7. Rückschlagventil nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Umfang der Stütze (50) innerhalb des Radius des gegenüberliegenden Ventilsitzes (12) angeordnet ist. 7. Check valve according to one of the preceding claims, characterized in that the circumference of the support (50) within the radius of the opposite valve seat (12) is arranged.
EP08785052A 2007-08-13 2008-07-24 Nonreturn valve, in particular for medical uses Withdrawn EP2175924A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE202007011322 2007-08-13
DE200720012680 DE202007012680U1 (en) 2007-08-13 2007-09-11 Check valve, in particular for medical applications
PCT/EP2008/006099 WO2009021605A1 (en) 2007-08-13 2008-07-24 Nonreturn valve, in particular for medical uses

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Publication Number Publication Date
EP2175924A1 true EP2175924A1 (en) 2010-04-21

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US (1) US8291936B2 (en)
EP (1) EP2175924A1 (en)
DE (1) DE202007012680U1 (en)
WO (1) WO2009021605A1 (en)

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US8291936B2 (en) 2012-10-23
DE202007012680U1 (en) 2008-01-03
US20110108147A1 (en) 2011-05-12

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