Medical valve with positive flow characteristics
First Claim
1. A medical valve for selectively permitting fluid to flow between a first medical device and a second medical device, the valve comprising:
- a housing having an interface suitable for receiving a connector portion of the first medical device; and
a seal made of a flexible material, the seal having a downstream end in fluid communication with the interface, an upstream end suitable for receiving the second medical device, and a normally substantially closed passage in fluid communication with the downstream end and the upstream end, the passage having a relatively small interior volume when in an undisturbed state and a larger interior volume upon the introduction of the second medical device into the upstream end of the passage, the passage retracting to define a restricted flow path and a relatively small interior volume upon the withdrawal of the second medical device from the seal, the upstream end initially being sealed as the second medical device is withdrawn, so that a fluid occupying the interior volume is forced toward the downstream end as the passage walls collapse.
0 Assignments
0 Petitions
Accused Products
Abstract
A valve for selectively permitting a fluid flow between first and second medical implements is disclosed. The valve has a housing with an interface suitable for receiving a connector portion of a first medical device such as a catheter, and a seal made of a flexible material. The seal has a first end in fluid communication with the interface, a second end suitable for receiving the second medical device, and at least one slit in fluid communication with the first end and the second end. The slit defines a restricted fluid flow path and a relatively small interior volume when in an undisturbed state, defines an expanded fluid flow path and a larger interior volume upon the introduction of the second medical instrument into the slit, and retracts to define a restricted flow path and a small interior volume upon the withdrawal of the second medical device from the seal. The slit is constructed such that its upstream end initially is sealed as the second medical device is withdrawn. A fluid occupying the small interior volume of the slit is forced toward the downstream end of the slit.
236 Citations
45 Claims
-
1. A medical valve for selectively permitting fluid to flow between a first medical device and a second medical device, the valve comprising:
-
a housing having an interface suitable for receiving a connector portion of the first medical device; and
a seal made of a flexible material, the seal having a downstream end in fluid communication with the interface, an upstream end suitable for receiving the second medical device, and a normally substantially closed passage in fluid communication with the downstream end and the upstream end, the passage having a relatively small interior volume when in an undisturbed state and a larger interior volume upon the introduction of the second medical device into the upstream end of the passage, the passage retracting to define a restricted flow path and a relatively small interior volume upon the withdrawal of the second medical device from the seal, the upstream end initially being sealed as the second medical device is withdrawn, so that a fluid occupying the interior volume is forced toward the downstream end as the passage walls collapse. - View Dependent Claims (2, 3)
-
-
11. A valve seal for use in a medical valve having an interface for fluid communication with a first medical device, the seal comprising:
a first end in fluid communication with the interface, a second end suitable for receiving a second medical device, and at least one slit in fluid communication with the first end and the second end, wherein the slit defines a restricted fluid flow path and a relatively small interior volume when in an undisturbed state, defines an expanded fluid flow path and a larger interior volume upon the introduction of the second medical device into the slit, and retracts to define a restricted flow path and a relatively small interior volume upon the withdrawal of the second medical device from the seal. - View Dependent Claims (12, 13)
-
14. A method of causing a positive flow in the direction of a first medical device from a valve that connects the first medical device to a second medical device and has an associated seal, the seal being adapted to receive at least a portion of the second medical device and provide fluid communication between the first and second medical devices, the method comprising the steps of:
-
withdrawing the second medical device from the seal; and
permitting the seal to retract from a large interior volume to a relatively small interior volume so as to displace any fluid within the seal in the direction of the first medical device.
-
-
15. A method of preventing blood from flowing out of a patient into a catheter when a syringe is withdrawn from a valve between the syringe and the catheter, the method comprising the steps of:
-
connecting the downstream end of the valve to the catheter;
inserting the end of the syringe into a slit forming the upstream end of a normally substantially closed seal passage that is located in a resilient seal and is in fluid communication with the downstream end of the valve, thereby causing the seal passage to open while providing sealing contact between the syringe and the upstream end of the seal passage;
injecting fluid from the syringe through the seal passage to the catheter and into the patient; and
withdrawing the syringe, allowing the walls of the seal passage to return to their substantially closed position while initially maintaining sealing contact between the upstream end and the syringe to thereby provide a force urging fluid in the passage toward the catheter. - View Dependent Claims (16)
-
-
17. A medical valve for selectively permitting fluid to flow between a first medical device and a second medical device through an associated seal, the valve comprising:
-
an interface suitable for receiving a connector portion of the first medical device; and
a seal holder in fluid communication with the interface.
-
-
18. A system for administering fluid to a blood vessel of a patient, the system comprising:
-
a catheter having an upstream end and a downstream end that is suitable for placement in fluid communication with the blood vessel;
a syringe suitable for expelling fluid into the catheter; and
a valve having a fitting suitable for connection to the upstream end of the catheter and providing selective fluid communication between the syringe and the catheter, the valve further comprising;
a seal made of a flexible material, the seal having a downstream end in fluid communication with the fitting, an upstream end suitable for receiving the syringe, and a normally substantially closed passage in fluid communication with the downstream end and the upstream end, the passage having a relatively small interior volume when in an undisturbed state and a larger interior volume upon the introduction of the syringe into the upstream end of the passage, the passage retracting to define a restricted flow path and a relatively small interior volume upon the withdrawal of the second medical device from the seal, the upstream end initially being sealed as the syringe is withdrawn, so that a fluid occupying the interior volume is forced toward the downstream end as the passage walls collapse.
-
-
19. A method of making a medical valve seal of the type having a body made of a flexible material and a slit formed within the body between adjacent first and second slit walls, the method comprising:
-
molding first and second preforms, each comprising one of said first and second slit walls and a perimeter edge portion;
pressing said first and second preforms together so that said first and second slit walls face each other; and
molding an additional amount of a flexible material to at least part of said perimeter edge portions of said first and second preforms so that said first and second preforms and said additional material form a unitary mass with said slit formed therein. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
-
-
27. A catheter for establishing fluid communication between a medical device and the vasculature of a patient, said catheter comprising:
-
an elongated cannula having a proximal end, a distal end, and at least one axial lumen extending through said cannula; and
a valve for selectively opening and closing said proximal end of said cannula, said valve comprising;
a housing having an interface suitable for connection to said proximal end of said cannula; and
a seal made of a flexible material, the seal having a distal end in fluid communication with said interface, a proximal end suitable for receiving the medical device, and a normally substantially closed passage in fluid communication with the distal end and the proximal end, the passage having a relatively small interior volume when in an undisturbed state and a larger interior volume upon the introduction of the medical device into the proximal end of the passage, the passage retracting to define a restricted flow path and a relatively small interior volume upon the withdrawal of the medical device from the seal, the proximal end initially being sealed as the second medical device is withdrawn, so that a fluid occupying the interior volume is forced toward the distal end as the passage walls collapse. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 28, 29, 30, 31, 32, 33, 34, 35)
-
-
36. A catheter, comprising:
-
an elongated cannula having a proximal end, a distal end, and a lumen extending between said proximal end and said distal end, said distal end being suitable for insertion into the vasculature of a patient; and
a valve connected to said proximal end of said cannula, said valve having a seal which defines a restricted flow path in its undisturbed state and which is capable of expanding to define an enlarged flow path to permit fluid communication through said proximal end of said cannula, said seal being further capable of retracting to define said restricted flow path, said seal simultaneously urging any fluid within said enlarged flow path into said cannula.
-
-
37. A method of introducing a fluid into the vasculature of a patient, the method comprising:
-
inserting a distal end of a cannula into the vasculature of the patient, said cannula having a valve connected to its proximal end, said valve comprising a housing and a seal;
placing a medical device into fluid communication with said seal;
operating said medical device so as to transfer said fluid through said cannula and the vasculature of the patient; and
withdrawing said medical device from said seal;
wherein said seal is made of a flexible material, and has a distal end in fluid communication with said cannula, a proximal end suitable for receiving said medical device, and a normally substantially closed passage in fluid communication with the distal end and the proximal end, the passage having a relatively small interior volume when in an undisturbed state and a larger interior volume upon the introduction of the medical device into the proximal end of the passage, the passage retracting to define a restricted flow path and a relatively small interior volume upon the withdrawal of the medical device from the seal, the proximal end initially being sealed as the second medical device is withdrawn, so that any of said fluid occupying the interior volume is forced toward the distal end as the passage walls collapse. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44)
-
-
45. A method of facilitating replacement of a first connector which is in fluid communication with a cannula implanted into a patient'"'"'s vasculature, with a second connector, said method comprising:
-
interposing a valve between said first connector and a proximal end of said cannula, said valve comprising;
a housing; and
a seal disposed within said housing, wherein said seal defines a restricted flow path in its undisturbed state and is capable of expanding to define an enlarged flow path to permit fluid communication past said proximal end of said cannula, said seal being further capable of retracting to define said restricted flow path, said seal simultaneously urging any fluid within said enlarged flow path into said cannula;
removing said first connector from a proximal end of said valve so as to permit said seal to retract to define said restricted flow path; and
connecting said second connector to said valve, thereby causing said valve to expand to define said enlarged flow path.
-
Specification