CA2454256A1 - Pressure transducer protection valve - Google Patents
Pressure transducer protection valve Download PDFInfo
- Publication number
- CA2454256A1 CA2454256A1 CA 2454256 CA2454256A CA2454256A1 CA 2454256 A1 CA2454256 A1 CA 2454256A1 CA 2454256 CA2454256 CA 2454256 CA 2454256 A CA2454256 A CA 2454256A CA 2454256 A1 CA2454256 A1 CA 2454256A1
- Authority
- CA
- Canada
- Prior art keywords
- inlet
- outlet
- seal
- valve
- plug seal
- 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.)
- Abandoned
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/04—Control of fluid pressure without auxiliary power
- G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
- G05D16/063—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane
- G05D16/0675—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting on the obturator through a lever
- G05D16/0677—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting on the obturator through a lever using one membrane without spring
- G05D16/068—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting on the obturator through a lever using one membrane without spring characterised by the form of the obturator
-
- 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
- A61M39/223—Multiway 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
- 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
-
- 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
- A61M5/16804—Flow controllers
- A61M5/16827—Flow controllers controlling delivery of multiple fluids, e.g. sequencing, mixing or via separate flow-paths
-
- 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
- Y10T137/7723—Safety cut-off requiring reset
- Y10T137/7725—Responsive to both high and low pressure or velocity
-
- 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
- Y10T137/8158—With indicator, register, recorder, alarm or inspection means
- Y10T137/8326—Fluid pressure responsive indicator, recorder or alarm
-
- 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
- Y10T137/8593—Systems
- Y10T137/86493—Multi-way valve unit
- Y10T137/86879—Reciprocating valve unit
- Y10T137/86895—Plural disk or plug
Abstract
A pressure activated valve for a three-way connection between a catheter, an injector and a pressure transducer is disclosed. The valve includes a body that has an inlet for connection to an injector, an outlet for connection to a catheter and a secondary connection for connection to a pressure transducer.
The body also includes a seal seat disposed between the secondary connection in both the inlet and the outlet. The body is flexibly connected to a plug seal. The plug seal is disposed between the seal seat in both the inlet and the outlet. The plug seal is movable between an open position spaced apart from the seal seat and biased towards the inlet and the outlet and a closed position against the seal seat thereby isolating the secondary connection from both the inlet and the outlet.
The body also includes a seal seat disposed between the secondary connection in both the inlet and the outlet. The body is flexibly connected to a plug seal. The plug seal is disposed between the seal seat in both the inlet and the outlet. The plug seal is movable between an open position spaced apart from the seal seat and biased towards the inlet and the outlet and a closed position against the seal seat thereby isolating the secondary connection from both the inlet and the outlet.
Description
PRESSURE TRANSDUCER PROTECTION VALVE
FIELD OF THE INVENTION
The present invention relates generally to the field of angiography and, more specifically, to a medical apparatus that includes a catheter, pressure transducer and injection mechanism which enables a contrast solution to be injected through a catheter into a blood vessel and which further enables the physician to monitor fluid pressure in the vessel during the procedure.
BACKGROUND OF THE INVENTION
The use of catheters to study and correct problems in the human circulatory system is known. Specifically, if any of the heart chambers, heart valves, arteries, veins or capillaries of a patient are malfunctioning due to birth defects, restrictions such as atherosclerotic plaque build-up or other causes or are deteriorated from an aneurism or other disease, then a physician may need to examiner the heart and associated network of blood vessels. Catheters are known to be used for such angiographic examinations as well as for carrying out corrective procedures such as ablation.
Angiography is a procedure used to detect and treat abnormalities or restrictions in blood vessels. During angiography, radiographic images of the vascular structure are obtained by injecting contrast material through a catheter into a vein or artery. The contrast material fills the vein or arteries and x-ray images are taken of the body region under examination. The x-rays are absorbed by the contrast material (also known as radiographic contrast material or solution) and the resulting x-rays produce a radiographic outline or image of the blood vessels under examination.
The angiographic images are useful for diagnostic purposes as well as for angioplasty or ablation procedures where a balloon is inserted into a vein and/or artery and~is subsequently inflated to open a restriction caused by atherosclerotic plaque build-up.
During an angiographic procedure, a catheter is placed into a vein or an _2_ artery. The catheter is also connected, at its proximal end, to either a manual or automatic contrast injection mechanism. The contrast injection mechanism injects the contrast solution into the catheter. Often, the catheter is also in fluid communication with a pressure transducer which is used to monitor the pressure in the vessel or artery under examination.
The pressure transducer and contrast injection mechanism are typically connected to the catheter through a manifold. The manifold includes a valve which enables the physician to isolate the pressure transducer during the injection of the contrast solution. The isolation of the pressure transducer is necessary because the transducer can be damaged by a pressure increase caused by the injection.
Specifically, many pressure transducers can be damaged if they are subjected to a pressure of over 125 psig. Because even a hand-held syringe can generate pressures of 200 psig or more, the isolation of the pressure transducer is essential in order to avoid transducer failure.
One solution to this problem is provided by some currently available manifolds which do not allow the contrast injection to be made while the pressure transducer is in communication with the catheter. Specifically, a stopcock configuration is provided which either allows the pressure transducer to be in fluid communication with the catheter or the contrast injection mechanism to be in fluid communication with the catheter, but not both. Typically, the stopcock handle must be turned manually to switch between the two positions.
The problem associated with these currently available manifolds is that the physician often forgets to turn the stopcock back to the position where the pressure transducer is in fluid communication with the catheter. As a result, the monitoring of the vessel or artery is interrupted for time periods longer than necessary.
The monitoring of the vessel or artery pressure is important during almost any vascular procedure. Accordingly, when the physician fails to turn the stopcock handle, other members of the medical team must interrupt the physician and tell him or her to turn it back on which may cause an unnecessary distraction to the physician during a delicate medical procedure.
Accordingly, there is a need for an improved valve or manifold device which can automatically isolate the pressure transducer from the catheter and contrast injection mechanism during the injection of the contrast solution.
SUMMARY OF THE INVENTION
The disclosed valve satisfies the aforenoted need by providing a pressure activated valve for a three-way connection between an inlet line, an outlet line and a secondary line. The valve comprises a body comprising an inlet, an outlet and a secondary connection. The body further comprises a seal seat disposed between the secondary connection and both the inlet and outlet. The body is flexibly connected to a plug seal. The plug seal is disposed between the seal seat and both the inlet and the outlet. The plug seal is movable between an open position spaced apart from the seal seat and biased towards the inlet and outlet in a closed position against the seal seat thereby isolating the secondary connection from both the inlet and the outlet.
In such an embodiment, the inlet is typically connected to a contrast injection mechanism, the outlet is connected to a catheter and the secondary connection is connected to a pressure transducer.
In a refinement of the disclosed valve, the body further comprises an opening to the atmosphere. In such a refinement, the plug seal is connected to a shaft and the shaft is connected to a flexible member so that the shaft is disposed between the flexible member and the plug seal. The flexible member is connected to the body at the opening so that the flexible member seals the opening. As a result, atmospheric pressure against the flexible member biases the shaft and plug seal towards the inlet and outlet, or towards the open position described above.
In a further refinement of the disclosed valve, the shaft is semi-rigid.
In a further refinement of the disclosed valve, the plug seal, shaft and flexible member are unitary in construction.
In yet another refinement of the disclosed valve, the flexible member is a diaphragm.
In yet another refinement of the disclosed valve, a secondary valve is disposed between the plug seal and both the inlet and the outlet. The plug seal is movable from the open position disclosed above to a secondary closed position where the plug seal engages the secondary seal thereby isolating the inlet and outlet from the secondary connection. Such a refinement enables the valve to isolate the pressure transducer when the pressure in the catheter drops below atmospheric pressure.
In a further refinement, the secondary seal comprises an annular extension from the body at a point between the seal seat and both the inlet and the outlet.
A method for isolating a pressure transducer from a catheter line during the injection of solution from an injection source into the catheter is also disclosed. The disclosed method comprises the steps of providing a catheter having a proximal end, a pressure transducer and an injection source. The disclosed method also comprises the step of attaching a pressure activated valve to the proximal end of the catheter.
The pressure activated valve provides a three-way connection between the injection source, the proximal end of the catheter and the pressure transducer. The valve comprises a body comprising an inlet, an outlet and a secondary connection.
The body further comprises a seal seat disposed between the secondary connection in both the inlet and the outlet. The body is flexibly connected to a plug seal.
The plug seal is disposed between the seal seat and both the inlet and the outlet.
The plug seal is movable between an open position spaced apart from the seal seat and biased towards the inlet and the outlet and a closed position against the seal seat thereby isolating the secondary connection from both the inlet and the outlet.
The method further comprises the steps of connecting the outlet to the proximal end of the catheter, connecting the secondary connection to the pressure transducer and connecting the inlet to the injection source. Finally, the method comprises the step of injecting solution from the injection source through the inlet of the body and towards the proximal end of the catheter thereby causing a pressure increase and causing the plug seal to move to the closed position thereby engaging the seal seat and thereby isolating the pressure transducer from the pressure increase.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described more or less diagrammatically in the accompanying drawings wherein:
Fig. 1 is a schematic sectional view illustrating one disclosed pressure activated valve made in accordance with the present invention;
Fig. 2 is a schematic sectional view of the valve shown in Fig. 1 in a position where the valve is isolating the pressure transducer due to an increase in pressure in the conduit; and Fig. 3 is another schematic sectional view of the valve shown in Fig. 1 wherein the valve has isolated the pressure transducer due to a pressure drop in the conduit.
It should be understood that the drawing is not necessarily to scale and that the embodiment is illustrated with a diagrammatic representation. In certain instances, details which are not necessary for an understanding of the disclosed valve or which render other details difficult to perceive may have been omitted. It should be understood, of course, that the invention is not necessarily limited to the particular embodiment illustrated herein.
DETAILED DESCRIPTION OF THE
PRESENTLY PREFERRED EMBODIMENT
Fig. 1 illustrates a valve 10 for isolating a pressure transducer 11 from an injection source 12 and a catheter line during injection of contrast solution from the injection mechanism 12 through the valve 10 and to the catheter 13.
The valve 10 includes a body 14 which provides a t-connection between the transducer 11, injection mechanism 12 and catheter 13. The body 14 includes an inlet 15 that is connected to the injection mechanism 12, an outlet 16 that is connected to the catheter 13 and a secondary connection 17 which is connected to the pressure transducer 11. A seal seat 1~ is disposed between the secondary connection 17 and both the inlet 15 and outlet 16. As shown in Fig. 2, the seal seat 1 g is engaged by the plug seal 19 of the valve 20 when a substantial pressure increase occurs in the conduit 22 due to the injection of solution from the injection mechanism 12 through the conduit 22 to the catheter 13.
The valve 20 includes the plug seal 19 which is connected to the shaft 23 which, in turn, is connected to a flexible member or diaphragm 24. The diaphragm 24 is sealably connected to the body 14 at the opening 25. As shown in Fig. 2, an increase in pressure in the conduit 22 causes the plug seal 19 to move towards the seal seat 18 thereby isolating the secondary connection 17 from the inlet 15 and outlet 16. This movement to the closed position is permitted by the flexible member or diaphragm 24. In the position shown in Fig. l, the valve 20 is in an open position and is biased in the open position 20 by atmospheric pressure on the outer surface 26 of the diaphragm 24.
Further, a secondary seal 28 may be provided as an extension from the body 14 at a point between the seal seat 18 and both the inlet 15 and outlet 16. As shown in Fig. 3, the secondary seal 28 engages the plug seal 19 in the event the pressure and the conduit 22 drops below atmospheric pressure. In such an event, the flexible diaphragm 24 will allow the plug seal 19 to move away from the seal seat 18 and towards the secondary seal 28 to isolate the pressure transducer 11 from the inlet 15 and outlet 16.
Thus, the pressure activated valve system 10 isolates the pressure transducer 11 in the event pressure in the conduit 22 is substantially increased as a result of an injection from the injector mechanism 12. In such an event, the plug seal moves from the open position shown in Fig. 1 towards the seal seat 18 thereby isolating the transducer 11 from both the inlet 15 and outlet 16. In contrast, in the event pressure in the conduit 22 drops below atmospheric pressure, the plug seal 19 will move away from the seal seat 18 and towards the secondary seal 22 to again isolate the transducer 11 from both the inlet 15 and outlet 16. As shown, the valve 20 can be unitary in construction. That is, the diaphragm 24, shaft or stem 23 and plug seal 19 can all be made or molded from the same material. Preferably, the shaft 23 is semi-rigid. The body 14 and valve 20 can be manufactured from polymer materials. One preferred polymer is polycarbonate. Other materials will be apparent to those skilled in the art.
_7_ While the specification describes a preferred design, those skilled in the art will appreciate the scope and spirit of the invention with reference to the appended claims .
FIELD OF THE INVENTION
The present invention relates generally to the field of angiography and, more specifically, to a medical apparatus that includes a catheter, pressure transducer and injection mechanism which enables a contrast solution to be injected through a catheter into a blood vessel and which further enables the physician to monitor fluid pressure in the vessel during the procedure.
BACKGROUND OF THE INVENTION
The use of catheters to study and correct problems in the human circulatory system is known. Specifically, if any of the heart chambers, heart valves, arteries, veins or capillaries of a patient are malfunctioning due to birth defects, restrictions such as atherosclerotic plaque build-up or other causes or are deteriorated from an aneurism or other disease, then a physician may need to examiner the heart and associated network of blood vessels. Catheters are known to be used for such angiographic examinations as well as for carrying out corrective procedures such as ablation.
Angiography is a procedure used to detect and treat abnormalities or restrictions in blood vessels. During angiography, radiographic images of the vascular structure are obtained by injecting contrast material through a catheter into a vein or artery. The contrast material fills the vein or arteries and x-ray images are taken of the body region under examination. The x-rays are absorbed by the contrast material (also known as radiographic contrast material or solution) and the resulting x-rays produce a radiographic outline or image of the blood vessels under examination.
The angiographic images are useful for diagnostic purposes as well as for angioplasty or ablation procedures where a balloon is inserted into a vein and/or artery and~is subsequently inflated to open a restriction caused by atherosclerotic plaque build-up.
During an angiographic procedure, a catheter is placed into a vein or an _2_ artery. The catheter is also connected, at its proximal end, to either a manual or automatic contrast injection mechanism. The contrast injection mechanism injects the contrast solution into the catheter. Often, the catheter is also in fluid communication with a pressure transducer which is used to monitor the pressure in the vessel or artery under examination.
The pressure transducer and contrast injection mechanism are typically connected to the catheter through a manifold. The manifold includes a valve which enables the physician to isolate the pressure transducer during the injection of the contrast solution. The isolation of the pressure transducer is necessary because the transducer can be damaged by a pressure increase caused by the injection.
Specifically, many pressure transducers can be damaged if they are subjected to a pressure of over 125 psig. Because even a hand-held syringe can generate pressures of 200 psig or more, the isolation of the pressure transducer is essential in order to avoid transducer failure.
One solution to this problem is provided by some currently available manifolds which do not allow the contrast injection to be made while the pressure transducer is in communication with the catheter. Specifically, a stopcock configuration is provided which either allows the pressure transducer to be in fluid communication with the catheter or the contrast injection mechanism to be in fluid communication with the catheter, but not both. Typically, the stopcock handle must be turned manually to switch between the two positions.
The problem associated with these currently available manifolds is that the physician often forgets to turn the stopcock back to the position where the pressure transducer is in fluid communication with the catheter. As a result, the monitoring of the vessel or artery is interrupted for time periods longer than necessary.
The monitoring of the vessel or artery pressure is important during almost any vascular procedure. Accordingly, when the physician fails to turn the stopcock handle, other members of the medical team must interrupt the physician and tell him or her to turn it back on which may cause an unnecessary distraction to the physician during a delicate medical procedure.
Accordingly, there is a need for an improved valve or manifold device which can automatically isolate the pressure transducer from the catheter and contrast injection mechanism during the injection of the contrast solution.
SUMMARY OF THE INVENTION
The disclosed valve satisfies the aforenoted need by providing a pressure activated valve for a three-way connection between an inlet line, an outlet line and a secondary line. The valve comprises a body comprising an inlet, an outlet and a secondary connection. The body further comprises a seal seat disposed between the secondary connection and both the inlet and outlet. The body is flexibly connected to a plug seal. The plug seal is disposed between the seal seat and both the inlet and the outlet. The plug seal is movable between an open position spaced apart from the seal seat and biased towards the inlet and outlet in a closed position against the seal seat thereby isolating the secondary connection from both the inlet and the outlet.
In such an embodiment, the inlet is typically connected to a contrast injection mechanism, the outlet is connected to a catheter and the secondary connection is connected to a pressure transducer.
In a refinement of the disclosed valve, the body further comprises an opening to the atmosphere. In such a refinement, the plug seal is connected to a shaft and the shaft is connected to a flexible member so that the shaft is disposed between the flexible member and the plug seal. The flexible member is connected to the body at the opening so that the flexible member seals the opening. As a result, atmospheric pressure against the flexible member biases the shaft and plug seal towards the inlet and outlet, or towards the open position described above.
In a further refinement of the disclosed valve, the shaft is semi-rigid.
In a further refinement of the disclosed valve, the plug seal, shaft and flexible member are unitary in construction.
In yet another refinement of the disclosed valve, the flexible member is a diaphragm.
In yet another refinement of the disclosed valve, a secondary valve is disposed between the plug seal and both the inlet and the outlet. The plug seal is movable from the open position disclosed above to a secondary closed position where the plug seal engages the secondary seal thereby isolating the inlet and outlet from the secondary connection. Such a refinement enables the valve to isolate the pressure transducer when the pressure in the catheter drops below atmospheric pressure.
In a further refinement, the secondary seal comprises an annular extension from the body at a point between the seal seat and both the inlet and the outlet.
A method for isolating a pressure transducer from a catheter line during the injection of solution from an injection source into the catheter is also disclosed. The disclosed method comprises the steps of providing a catheter having a proximal end, a pressure transducer and an injection source. The disclosed method also comprises the step of attaching a pressure activated valve to the proximal end of the catheter.
The pressure activated valve provides a three-way connection between the injection source, the proximal end of the catheter and the pressure transducer. The valve comprises a body comprising an inlet, an outlet and a secondary connection.
The body further comprises a seal seat disposed between the secondary connection in both the inlet and the outlet. The body is flexibly connected to a plug seal.
The plug seal is disposed between the seal seat and both the inlet and the outlet.
The plug seal is movable between an open position spaced apart from the seal seat and biased towards the inlet and the outlet and a closed position against the seal seat thereby isolating the secondary connection from both the inlet and the outlet.
The method further comprises the steps of connecting the outlet to the proximal end of the catheter, connecting the secondary connection to the pressure transducer and connecting the inlet to the injection source. Finally, the method comprises the step of injecting solution from the injection source through the inlet of the body and towards the proximal end of the catheter thereby causing a pressure increase and causing the plug seal to move to the closed position thereby engaging the seal seat and thereby isolating the pressure transducer from the pressure increase.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described more or less diagrammatically in the accompanying drawings wherein:
Fig. 1 is a schematic sectional view illustrating one disclosed pressure activated valve made in accordance with the present invention;
Fig. 2 is a schematic sectional view of the valve shown in Fig. 1 in a position where the valve is isolating the pressure transducer due to an increase in pressure in the conduit; and Fig. 3 is another schematic sectional view of the valve shown in Fig. 1 wherein the valve has isolated the pressure transducer due to a pressure drop in the conduit.
It should be understood that the drawing is not necessarily to scale and that the embodiment is illustrated with a diagrammatic representation. In certain instances, details which are not necessary for an understanding of the disclosed valve or which render other details difficult to perceive may have been omitted. It should be understood, of course, that the invention is not necessarily limited to the particular embodiment illustrated herein.
DETAILED DESCRIPTION OF THE
PRESENTLY PREFERRED EMBODIMENT
Fig. 1 illustrates a valve 10 for isolating a pressure transducer 11 from an injection source 12 and a catheter line during injection of contrast solution from the injection mechanism 12 through the valve 10 and to the catheter 13.
The valve 10 includes a body 14 which provides a t-connection between the transducer 11, injection mechanism 12 and catheter 13. The body 14 includes an inlet 15 that is connected to the injection mechanism 12, an outlet 16 that is connected to the catheter 13 and a secondary connection 17 which is connected to the pressure transducer 11. A seal seat 1~ is disposed between the secondary connection 17 and both the inlet 15 and outlet 16. As shown in Fig. 2, the seal seat 1 g is engaged by the plug seal 19 of the valve 20 when a substantial pressure increase occurs in the conduit 22 due to the injection of solution from the injection mechanism 12 through the conduit 22 to the catheter 13.
The valve 20 includes the plug seal 19 which is connected to the shaft 23 which, in turn, is connected to a flexible member or diaphragm 24. The diaphragm 24 is sealably connected to the body 14 at the opening 25. As shown in Fig. 2, an increase in pressure in the conduit 22 causes the plug seal 19 to move towards the seal seat 18 thereby isolating the secondary connection 17 from the inlet 15 and outlet 16. This movement to the closed position is permitted by the flexible member or diaphragm 24. In the position shown in Fig. l, the valve 20 is in an open position and is biased in the open position 20 by atmospheric pressure on the outer surface 26 of the diaphragm 24.
Further, a secondary seal 28 may be provided as an extension from the body 14 at a point between the seal seat 18 and both the inlet 15 and outlet 16. As shown in Fig. 3, the secondary seal 28 engages the plug seal 19 in the event the pressure and the conduit 22 drops below atmospheric pressure. In such an event, the flexible diaphragm 24 will allow the plug seal 19 to move away from the seal seat 18 and towards the secondary seal 28 to isolate the pressure transducer 11 from the inlet 15 and outlet 16.
Thus, the pressure activated valve system 10 isolates the pressure transducer 11 in the event pressure in the conduit 22 is substantially increased as a result of an injection from the injector mechanism 12. In such an event, the plug seal moves from the open position shown in Fig. 1 towards the seal seat 18 thereby isolating the transducer 11 from both the inlet 15 and outlet 16. In contrast, in the event pressure in the conduit 22 drops below atmospheric pressure, the plug seal 19 will move away from the seal seat 18 and towards the secondary seal 22 to again isolate the transducer 11 from both the inlet 15 and outlet 16. As shown, the valve 20 can be unitary in construction. That is, the diaphragm 24, shaft or stem 23 and plug seal 19 can all be made or molded from the same material. Preferably, the shaft 23 is semi-rigid. The body 14 and valve 20 can be manufactured from polymer materials. One preferred polymer is polycarbonate. Other materials will be apparent to those skilled in the art.
_7_ While the specification describes a preferred design, those skilled in the art will appreciate the scope and spirit of the invention with reference to the appended claims .
Claims (14)
1. A pressure activated valve 10 for a three way connection to an. inlet line 12, an outlet line 13 and a secondary lime 11, the valve 10 comprising:
a body 14 comprising an inlet 15, an outlet 16 and a secondary connection 17, the body 14 further comprising a seal seat 18 disposed between the secondary connection 17 and both the inlet 15 and the outlet 16, the body 14 further comprising an opening 25 to the atmosphere, the body 14 being flexibly connected to a plug seal 19 by a diaphragm 24 that seals the opening 25 to the atmosphere, the plug seal 19 being disposed between the seal seat 18 and both the inlet 15 and the outlet 16, the plug seal 19 being movable between an open position spaced apart from the seal seat 18 and a closed position against the seal seat 18 thereby isolating the secondary connection 17 from both the inlet 15 and the outlet 16.
a body 14 comprising an inlet 15, an outlet 16 and a secondary connection 17, the body 14 further comprising a seal seat 18 disposed between the secondary connection 17 and both the inlet 15 and the outlet 16, the body 14 further comprising an opening 25 to the atmosphere, the body 14 being flexibly connected to a plug seal 19 by a diaphragm 24 that seals the opening 25 to the atmosphere, the plug seal 19 being disposed between the seal seat 18 and both the inlet 15 and the outlet 16, the plug seal 19 being movable between an open position spaced apart from the seal seat 18 and a closed position against the seal seat 18 thereby isolating the secondary connection 17 from both the inlet 15 and the outlet 16.
2. The valve 10 of claim 1 wherein the plug seal 19 is connected to a shaft 23, the shaft 23 being connected to the diaphragm 24 so that the shaft 23 is disposed between the diaphragm 24 and the plug seal 19.
3. The valve of claim 1 wherein the shall 23 is semi-rigid.
4. The valve o~ claim 1 wherein the plug seal 19, shaft 23 and diaphragm 24 are unitary in construction.
5. The valve 10 of claim 1 further comprising a secondary seal 28 disposed between the plug seal 19 and both the inlet 15 and the outlet 16, the plug seal 19 further being movable into a secondary closed position where the plug seal 19 moves from the open position and towards the inlet 15 and the outlet 16 and engages the secondary seal 28 thereby isolating the inlet 15 and the outlet 16 from the secondary connection 17.
6. The valve 10 of claim 5 wherein the secondary seal 28 comprises an annular extension 28 from the body 14 between the seal seat 18 and both the inlet 15 and the outlet 16.
7. A valve 14 for isolating a pressure transducer 11 from an inlet line 12 and an outlet line 13, the valve 10 comprising:
a body 14 comprising an inlet 15 for connection to the inlet line 12, an outlet 16 for connection to the outlet line 13 and a secondary connection 17 for connection to the pressure transducer 11, the body 14 further comprising a seal seat 18 disposed between the secondary connection 17 and both the inlet 15 and the outlet 16, the body 14 being flexibly connected to a valve member 19, the valve member 20 comprising a plug seal 19, a stem 23 and a diaphragm 24, the stem 23 being disposed between the plug seal 19 and the diaphragm 24 and connecting the plug seal 19 to the diaphragm 24, the plug seal 19 being disposed between the seal seat 18 and both the inlet 15 and the outlet 15, the plug seal 19 being movable between an open position spaced apart from the seal seat and biased towards the inlet 15 and the outlet 16 and a closed position against the seal seat 18 thereby isolating the secondary connection 17 from both the inlet 15 and the outlet 16.
the body 14 further comprising an opening 25 to the atmosphere, the diaphragm 24 being connected to the body 14 at the opening 25 so that the diaphragm 24 seals the opening 25.
a body 14 comprising an inlet 15 for connection to the inlet line 12, an outlet 16 for connection to the outlet line 13 and a secondary connection 17 for connection to the pressure transducer 11, the body 14 further comprising a seal seat 18 disposed between the secondary connection 17 and both the inlet 15 and the outlet 16, the body 14 being flexibly connected to a valve member 19, the valve member 20 comprising a plug seal 19, a stem 23 and a diaphragm 24, the stem 23 being disposed between the plug seal 19 and the diaphragm 24 and connecting the plug seal 19 to the diaphragm 24, the plug seal 19 being disposed between the seal seat 18 and both the inlet 15 and the outlet 15, the plug seal 19 being movable between an open position spaced apart from the seal seat and biased towards the inlet 15 and the outlet 16 and a closed position against the seal seat 18 thereby isolating the secondary connection 17 from both the inlet 15 and the outlet 16.
the body 14 further comprising an opening 25 to the atmosphere, the diaphragm 24 being connected to the body 14 at the opening 25 so that the diaphragm 24 seals the opening 25.
8. The valve 10 of claim 7 wherein the shaft 23 is semi-rigid.
9. The valve of claim 7 wherein the plug seal 19, shat 23 and the diaphragm 24 are unitary in construction.
10. The valve of claim 7 further comprising a secondary seal 28 disposed between the plug seal 19 and the inlet 15 and the outlet 16, the plug seal 19 further being movable into a secondary closed position where the plug seal l9 moves from the open position and towards the inlet 15 and the outlet 16 to engage the secondary seal 28 thereby isolating the inlet 15 and the outlet 16 from the secondary connection 17.
11. The valve of claim 10 wherein the secondary seal 28 comprises an annular extension 28 from the body 14 between the seal seat 18 and both the inlet 15 and the outlet 16.
12. A valve 10 for isolating a pressure transducer 11 from an inlet line 12 and an outlet line 13, the valve 10 comprising:
a body 14 comprising an inlet 15 for connection to the inlet line 12, an outlet 16 for connection to the outlet line 13, a secondary connection 17 for connection to the pressure transducer 11 and an opening 25 to the atmosphere, the body 14 further comprising a seal seat 18 disposed between the secondary connection 17 and both the inlet 15 and the outlet 16, the body 14 being flexibly connected to a valve member 20, the valve member 24 comprising a plug seal 19, a stem 23 and a diaphragm 24, the stem 23 being disposed between the plug seal 19 and the diaphragm 24 and connecting the plug seal 19 to the diaphragm 24, the diaphragm 24 being sealably connected to the body 14 at the opening 25 to the atmosphere, the plug seal 19 being disposed between the seal seat 18 and both the inlet 15 and the outlet 16, the plug seal 19 being movable between an open position spaced apart from the seal seat 18 and biased towards the inlet 15 and the outlet 16 and a closed position against the seal seat 18 thereby isolating the secondary connection 17 from both the inlet 15 and the outlet 16, and the body 14 further compring a secondary seat 28 disposed between the plug seal 19 and the inlet 15 and the outlet 16, the plug seal 19 further being movable into a secondary closed position where the plug seal 19 moves from the open position and towards the secondary seal 28 and inlet 15 and the outlet 16 thereby isolating the inlet 15 and the outlet 16 from the secondary connection 17.
a body 14 comprising an inlet 15 for connection to the inlet line 12, an outlet 16 for connection to the outlet line 13, a secondary connection 17 for connection to the pressure transducer 11 and an opening 25 to the atmosphere, the body 14 further comprising a seal seat 18 disposed between the secondary connection 17 and both the inlet 15 and the outlet 16, the body 14 being flexibly connected to a valve member 20, the valve member 24 comprising a plug seal 19, a stem 23 and a diaphragm 24, the stem 23 being disposed between the plug seal 19 and the diaphragm 24 and connecting the plug seal 19 to the diaphragm 24, the diaphragm 24 being sealably connected to the body 14 at the opening 25 to the atmosphere, the plug seal 19 being disposed between the seal seat 18 and both the inlet 15 and the outlet 16, the plug seal 19 being movable between an open position spaced apart from the seal seat 18 and biased towards the inlet 15 and the outlet 16 and a closed position against the seal seat 18 thereby isolating the secondary connection 17 from both the inlet 15 and the outlet 16, and the body 14 further compring a secondary seat 28 disposed between the plug seal 19 and the inlet 15 and the outlet 16, the plug seal 19 further being movable into a secondary closed position where the plug seal 19 moves from the open position and towards the secondary seal 28 and inlet 15 and the outlet 16 thereby isolating the inlet 15 and the outlet 16 from the secondary connection 17.
13. The valve 10 of claim 12 wherein the secondary seal 28 comprises an annular extension 28 from the body 14 between the seal seat 18 and both the inlet 15 and the outlet 16.
14. A method of isolating a pressure transducer 11 from a catheter line 13 during an injection of solution from an injection source 12 into the catheter 13, the method comprising:
providing a catheter 13 having a proximal end, a pressure transducer 11 and an injection source 12, attaching a pressure activated valve 10 to the proximal end of the catheter 13, the pressure activated valve 20 providing a three way connection between the infection source 12, the proximal end of the catheter 13 and the pressure transducer 11, the valve 10 comprising a body 14 comprising an inlet 15, an outlet 16 and a secondary connection 17, the body 14 further comprising a seal seat 18 disposed between the secondary connection 19 and both the inlet 15 and the outlet 16, the body 14 being flexibly connected to a plug seal 19 by diaphragm 24 comprising one side connected to the plug seal 19 and another side exposed to the atmosphere, the plug seal 19 being disposed between the seal seat 18 and both the inlet 15 and the outlet 16, the plug seal 19 being movable between an open position spaced apart from the seal seat 18 and biased towards the inlet 15 and the outlet I6 and a closed position against the seal seat 18 thereby isolating the secondary connection 17 from both the inlet 15 and the outlet 16, connecting the outlet 16 to the proximal end of the catheter 13, connecting the secondary connection 17 to the pressure transducer 11, connecting the inlet 15 to the injection source 12, injecting solution from the injection source 12 through the inlet 15 of the body 14 and towards the proximal end of the catheter 13 thereby causing a pressure increase and causing the plug seal 19 to move to the closed position thereby isolating the pressure transducer 11 from the pressure increase.
providing a catheter 13 having a proximal end, a pressure transducer 11 and an injection source 12, attaching a pressure activated valve 10 to the proximal end of the catheter 13, the pressure activated valve 20 providing a three way connection between the infection source 12, the proximal end of the catheter 13 and the pressure transducer 11, the valve 10 comprising a body 14 comprising an inlet 15, an outlet 16 and a secondary connection 17, the body 14 further comprising a seal seat 18 disposed between the secondary connection 19 and both the inlet 15 and the outlet 16, the body 14 being flexibly connected to a plug seal 19 by diaphragm 24 comprising one side connected to the plug seal 19 and another side exposed to the atmosphere, the plug seal 19 being disposed between the seal seat 18 and both the inlet 15 and the outlet 16, the plug seal 19 being movable between an open position spaced apart from the seal seat 18 and biased towards the inlet 15 and the outlet I6 and a closed position against the seal seat 18 thereby isolating the secondary connection 17 from both the inlet 15 and the outlet 16, connecting the outlet 16 to the proximal end of the catheter 13, connecting the secondary connection 17 to the pressure transducer 11, connecting the inlet 15 to the injection source 12, injecting solution from the injection source 12 through the inlet 15 of the body 14 and towards the proximal end of the catheter 13 thereby causing a pressure increase and causing the plug seal 19 to move to the closed position thereby isolating the pressure transducer 11 from the pressure increase.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/934,242 | 2001-08-21 | ||
| US09/934,242 US6896002B2 (en) | 2001-08-21 | 2001-08-21 | Pressure transducer protection valve |
| PCT/US2002/026382 WO2003015851A1 (en) | 2001-08-21 | 2002-08-20 | Pressure transducer protection valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2454256A1 true CA2454256A1 (en) | 2003-02-27 |
Family
ID=25465222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2454256 Abandoned CA2454256A1 (en) | 2001-08-21 | 2002-08-20 | Pressure transducer protection valve |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US6896002B2 (en) |
| EP (1) | EP1418962B1 (en) |
| JP (1) | JP4423436B2 (en) |
| CA (1) | CA2454256A1 (en) |
| DE (1) | DE60230520D1 (en) |
| WO (1) | WO2003015851A1 (en) |
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-
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- 2001-08-21 US US09/934,242 patent/US6896002B2/en not_active Expired - Lifetime
-
2002
- 2002-08-20 DE DE60230520T patent/DE60230520D1/en not_active Expired - Lifetime
- 2002-08-20 CA CA 2454256 patent/CA2454256A1/en not_active Abandoned
- 2002-08-20 EP EP02773217A patent/EP1418962B1/en not_active Expired - Fee Related
- 2002-08-20 JP JP2003520805A patent/JP4423436B2/en not_active Expired - Lifetime
- 2002-08-20 WO PCT/US2002/026382 patent/WO2003015851A1/en active Application Filing
-
2005
- 2005-05-05 US US11/122,723 patent/US6986742B2/en not_active Expired - Lifetime
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| US20050205142A1 (en) | 2005-09-22 |
| WO2003015851A1 (en) | 2003-02-27 |
| JP2004538102A (en) | 2004-12-24 |
| US6896002B2 (en) | 2005-05-24 |
| US20030040723A1 (en) | 2003-02-27 |
| WO2003015851B1 (en) | 2003-11-27 |
| US6986742B2 (en) | 2006-01-17 |
| JP4423436B2 (en) | 2010-03-03 |
| DE60230520D1 (en) | 2009-02-05 |
| EP1418962A1 (en) | 2004-05-19 |
| EP1418962B1 (en) | 2008-12-24 |
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