Hemostasis valves and methods of use
Devices, systems, and methods for sealing medical devices, particularly during intravascular access, are disclosed herein. Some aspects relate to a hemostatic valve for sealing a wide range of medical devices, such as catheters, wires, embolectomy systems. The valve can include an elongate member having a first end, a second end, and a central lumen extending therebetween. A reinforcement structure extends along at least a portion of the elongate member and is coupled to the elongate member. A shell defining a first aperture and a second aperture may be included, which first and second apertures can be fluidly coupled by the elongate member. A tensioning mechanism is coupled to the shell and to the elongate member, the tensioning mechanism can be moveable between a first configuration wherein the tensioning mechanism is collapsed and the central lumen is sealed and a second configuration wherein the central lumen is open.
1. A valve, comprising:
an elongate member defining a lumen;
an active tensioning mechanism including an actuator coupled to the elongate member via a filament extending at least partially around the elongate member, wherein the actuator is moveable between (a) a first position wherein the lumen is constricted and sealed and (b) a second position wherein the lumen is at least partially open; and
a biasing member configured to bias the actuator to the first position.
2. The valve of claim 1 wherein the elongate member is pliable.
3. The valve of claim 1 wherein the filament extends in a loop around the elongate member.
4. The valve of claim 1 wherein the actuator is a button, wherein the button is undepressed in the first position, and wherein the button is depressed in the second position.
5. The valve of claim 1 wherein, when the actuator is in the first position, the lumen is configured to remain constricted and sealed when a pressure differential exists between (a) a first volume outside the lumen and adjacent to a first end of the elongate member and (b) a second volume outside the lumen and adjacent to a second end of the elongate member.
6. The valve of claim 1 wherein, when the actuator is in the first position, the lumen is configured to remain constricted and sealed when vacuum pressure is applied to a volume outside the lumen and adjacent to either a first end or a second end of the elongate member.
7. The valve of claim 1 wherein the lumen extends a long a first longitudinal axis, wherein the actuator is movable between the first and second positions along a second longitudinal axis, and wherein the first longitudinal axis is orthogonal to the second longitudinal axis.
8. The valve of claim 1 wherein the biasing member is a compression spring.
9. The valve of claim 1 wherein, in the first position, the actuator pulls the filament to circumferentially constrict the elongate member such that the lumen is constricted and sealed.
10. The valve of claim 1 wherein the actuator is a first actuator, wherein the filament is a first filament, wherein the biasing member is a first biasing member, and wherein the active tensioning mechanism further comprises:
a second actuator coupled to the elongate member via a second filament extending at least partially around the elongate member, wherein the second actuator is moveable between (a) a first position wherein the lumen is constricted and sealed and (b) a second position wherein the lumen is at least partially open; and
a second biasing member configured to bias the second actuator to the first position.
11. The valve of claim 10 wherein the first filament has a first end portion coupled to the first actuator and a second end portion coupled to the first actuator, and wherein the second filament has a first end portion coupled to the second actuator and a second end portion coupled to the second actuator.
12. The valve of claim 11 wherein the first filament and the second filament at least partially overlap to define a constricting region about the elongate member.
13. The valve of claim 12 wherein, when the second actuator is moved to the second position and/or the second actuator is moved to the second position, a size of the constricting region increases.
14. The valve of claim 10 wherein the first filament extends in a loop around the elongate member, and wherein the second filament extends through the loop of the first filament around the elongate member.
15. A valve, comprising:
an elongate member defining a lumen;
a filament coupled to the elongate member;
an actuator coupled to the filament, wherein the actuator is moveable between (a) a first position wherein the lumen is constricted and sealed and (b) a second position wherein the lumen is at least partially open; and
a biasing member configured to bias the actuator to the first position.
16. The valve of claim 15 wherein the filament extends at least partially around the elongate member.
17. The valve of claim 16 wherein, in the first position, the actuator pulls the filament to circumferentially constrict the elongate member such that the lumen is constricted and sealed.
18. The valve of claim 15 wherein the elongate member is pliable.
19. The valve of claim 15 wherein the filament is monofilament.
20. The valve of claim 15 wherein the actuator is a button that is undepressed in the first position and depressed in the second position, wherein the button is movable between the first and second positions along a first longitudinal axis, wherein the lumen extends a long a second longitudinal axis, and wherein the first longitudinal axis is orthogonal to the second longitudinal axis.
21. A valve, comprising:
an elongate member defining a lumen;
a filament coupled to the elongate member; and
an actuator coupled to the elongate member, wherein the actuator is moveable between
(a) a first position in which the actuator pulls the filament to collapse the elongate member such that the lumen is constricted and sealed and
(b) a second position wherein the lumen is at least partially open;
a biasing member configured to bias the actuator to the first position.
22. The valve of claim 21 wherein the elongate member is pliable, and wherein the filament extends at least partially around the elongate member.
23. The valve of claim 21 wherein the elongate member is pliable, and wherein the filament is looped around the elongate member.
24. The valve of claim 21 wherein the actuator does not substantially pull the filament in the second position such that the elongate member can expand.
25. A valve, comprising:
an elongate member defining a lumen; and
an active tensioning mechanism including a first actuator coupled to the elongate member via a first filament and a second actuator coupled to the elongate member via a second filament,
wherein the first filament and the second filament at least partially overlap to define a constricting region,
wherein the elongate member extends through the constricting region, and
wherein the first actuator and/or the second actuator is moveable between (a) a first position in which the constricting region has a decreased size such that the lumen is constricted and sealed and (b) a second position in which the constricting region has an increased size such that the lumen is at least partially open.
26. The valve of claim 25 , further comprising at least one biasing member configured to bias the first actuator and/or the second actuator to the first position.