Methods and devices for vascular access
Valve assemblies having improved ability to selectively control flow of fluids through the catheter and prevent leakage of fluids from the proximal end of a catheter that is positioned within a patient. Such improved catheter valve assemblies also prevent leakage of fluids after repeated insertion and removal of medical instruments through the valve.
1. A valve assembly configured for use with a medical device having a distal end, a lateral surface and a connector portion, the valve assembly comprising:
a hub configured to receive the medical device in a proximal end;
a valve coupled to a chamber within the hub and comprising a barrier layer at a far end and a wall portion;
the wall portion extending proximally from the barrier layer towards a near end of the valve, the wall portion defining a valve cavity therein, the barrier layer having at least one slit extending therethrough;
wherein a thickness of the barrier layer is greater than an offset distance measured between an inner surface of the wall portion and a surface of the chamber;
wherein the valve is configured for positioning in the hub such that the wall portion engages the surface of the chamber; and
wherein when closed, the valve prevents leakage caused by pressure of fluid flow against the valve and wherein insertion of the medical device into the valve cavity causes the distal end of the medical device to deform the barrier layer to open the at least one slit to permit fluid flow through the barrier layer, while the lateral surface of the medical device engages the wall portion at an interior of the valve cavity causing the wall portion to engage the surface of the chamber.
2. The valve assembly of claim 1 , wherein an entire outer surface of the wall portion contacts the surface of the chamber.
3. The valve assembly of claim 1 , wherein the wall portion includes at least one or more gaps to form at least one or more legs.
4. The valve assembly of claim 1 , further comprising an insert positioned within the valve, wherein the insert is configured to receive the medical device.
5. The valve assembly of claim 4 , wherein the valve cavity further comprises a mating shape and the insert further comprises a mating shape configured to mate with the mating shape of the valve cavity.
6. The valve assembly of claim 1 , further comprising a raised surface positioned within the valve, wherein upon insertion of the medical device, the raised surface is configured to be pushed by the medical device to open the valve.
7. The valve assembly of claim 1 , wherein an entire outer surface of the wall portion comprises a cylindrical shape having a uniform outer diameter.
8. The valve assembly of claim 1 , wherein the valve is axially recessed within the hub.
9. The valve assembly of claim 1 , wherein the at least one slit forms a plurality of leaflets in the barrier layer.
10. The valve assembly of claim 9 , wherein a thickness of each of the plurality of leaflets is the same.
11. The valve assembly of claim 9 , wherein a perimeter of the at least one slit is limited to the barrier layer such that the plurality of leaflets does not extend into the wall portion.
12. The valve assembly of claim 1 , further comprising a flange portion at the near end of the valve, wherein a proximal end of the flange portion extends beyond the proximal end of the hub.
13. The valve assembly of claim 12 , wherein the flange portion partially covers the proximal end of the hub.
14. The valve assembly of claim 12 , wherein the flange portion comprises a raised surface on an exterior surface of the valve.
15. The valve assembly of claim 1 , wherein the near end of the valve is flush with the proximal end of the hub.
16. The valve assembly of claim 1 , wherein the wall portion further comprises one or more ribs configured to facilitate seating of the valve within the hub.
17. The valve assembly of claim 1 , further comprising an insert coupled to the valve, wherein the insert comprises a first material and the valve comprises a second material, wherein the first material and second material comprise different structural properties.
18. The valve assembly of claim 17 , wherein the first material comprises a first durometer and the second material comprises a second durometer being less than the first durometer such that the second material comprises a greater elasticity relative to the first material.
19. The valve assembly of claim 1 , wherein an offset distance, measured between a surface of the wall portion in the valve cavity and a surface of the chamber adjacent to the barrier layer at the far end of the valve the distal end, is less than a thickness of the barrier layer.
20. A valve assembly configured for use with a medical device having a distal end, a lateral surface and a connector portion, the valve assembly comprising:
a hub configured to receive the medical device in a proximal end;
a valve coupled to a chamber within the hub and comprising a barrier layer at a far end and a wall portion;
a raised surface positioned within the valve,
the wall portion extending proximally from the barrier layer towards a near end of the valve, the wall portion defining a valve cavity therein, the barrier layer having at least one slit extending therethrough;
wherein a thickness of the barrier layer is greater than an offset distance measured between an inner surface of the wall portion and a surface of the chamber;
wherein the valve is configured for positioning in the hub such that the wall portion engages the surface of the chamber; and
wherein insertion of the medical device into the valve cavity causes the distal end of the medical device to push the raised surface to deform the barrier layer and open the at least one slit to permit fluid flow through the barrier layer, while the lateral surface of the medical device engages the wall portion at an interior of the valve cavity causing the wall portion to engage the surface of the chamber.