Introducer sheath assembly having a locking dilator
An introducer assembly includes a valve having a first end and an opposite second end; a sheath fixedly secured to and extending axially from one of the first and second ends of the valve; a dilator extending through the valve and sheath; and a lock knob rotatable between locked and unlocked positions to releasably axially lock the tool relative to the sheath without causing corresponding rotation of the tool therewith.
1. A locking mechanism for an endoluminal delivery system, the locking mechanism comprising:
a first component having an annular recess and a groove that intersects with and extends radially from the annular recess and an annular edge projecting into the annular recess to at least partially define the groove; and
a second component including a locking tab configured to be received within the annular recess such that when the second component is rotated relative to the first component the locking tab travels within the recess, the locking tab including a protrusion configured to be received within the groove such that upon relative rotation between the first component and the second component the protrusion is engaged with the annular edge to axially constrain the first component relative to the second component.
2. The locking mechanism of claim 1 , the first component further including a bump formed along the annular recess, the bump configured to engage the protrusion to rotatably hold the second component.
3. The locking mechanism of claim 1 , wherein the locking tab extends axially from an end surface of the second component.
4. The locking mechanism of claim 3 , wherein the protrusion extends radially from an end of the locking tab and is axially spaced apart from the end surface of the second component.
5. The locking mechanism of claim 3 , the second component including two locking tabs extending from opposite sides of the end surface of the second component.
6. The locking mechanism of claim 1 , the first component further including an annular tapered portion configured to engage with a detachable device to prevent leakage from the locking mechanism.
7. The locking mechanism of claim 6 , the first component further including an additional annular recess extending around the annular tapered portion.
8. The locking mechanism of claim 7 , the first component further including a ring positioned along the annular recess.
9. The locking mechanism of claim 8 , wherein the ring is formed from a resilient sealing material.
10. The locking mechanism of claim 8 , wherein the annular tapered portion is configured to extend into an inner tube of the detachable device, and the ring is configured to engage with and elastically radially deform the inner tube to form a fluid seal.
11. The locking mechanism of claim 10 , wherein the inner tube includes a porous substrate.
12. The locking mechanism of claim 10 , wherein a sheath is fixedly secured at an end portion of the detachable device, and the sheath is configured to receive an elongated tool therethrough.
13. The locking mechanism of claim 12 , wherein the inner tube and the sheath are coaxially aligned to receive the elongated tool through both the inner tube and the sheath.
14. The locking mechanism of claim 12 , wherein the second component is rotatable without causing rotation of the elongated tool relative to at least one of the sheath or the detachable device.
15. The locking mechanism of claim 1 , the second component further comprising at least one radially extending rib configured to engage with a bearing surface of a detachable hub to radially locate the second component relative to the detachable hub.
16. The locking mechanism of claim 15 , wherein the second component and the detachable hub are both axially constrained relative to each other and freely rotatable relative to each other.
17. The locking mechanism of claim 15 , the detachable hub further including a plurality of location surfaces that extend radially outwardly from the bearing surface and are axially spaced apart on the bearing surface.
18. The locking mechanism of claim 17 , the at least one radially extending rib configured to axially engage with the locating surfaces to axially locate and constrain the second component relative to the detachable hub.
19. A method of operating a locking mechanism for an endoluminal delivery system, the method comprising:
aligning a first component to a second component, including aligning a protrusion of a locking tab of the second component with an annular recess of the first component, the first component including a groove that intersects with and extends radially from the annular recess and an annular edge that projects into the annular recess to at least partially define the groove;
rotating the first and second components relative to one another with the locking tab received within the annular recess such that the locking tab travels within the recess with the protrusion received within the groove until the protrusion is engaged with the annular edge to axially constrain the first component relative to the second component.
20. The method of claim 19 , the first component further including a bump formed along the annular recess, the method further comprising:
engaging the bump with the protrusion to selectively retain the relative rotational orientations of the first and second components.