Access sheath
Disclosed is an assembly of parts for an endourological procedure, including a tubular sheath and an introducer, the tubular sheath being removably mounted on the introducer. The introducer comprises a security channel that is openable to shift a guidewire from a position inside the security channel to a position outside and next to the tubular sheath. Disclosed are also access sheaths and a method of performing an endourological procedure.
1. An assembly of parts for an endourological procedure comprising an introducer and a tubular sheath removably engaged on the introducer,
the tubular sheath comprising a lumen extending between a proximal end and a flared distal end of the tubular sheath,
the introducer comprising a security channel along at least a part of a longitudinal extent defined between a tapered proximal end and a distal end, the security channel adapted to configure the introducer to accommodate a single guidewire during insertion of the assembly into a body of a patient,
the security channel extending between a proximal hole and a distal hole of the introducer, a wall section of the introducer extending between the proximal and distal holes of the introducer that provides a slit that is arranged to open under action of a radially outwardly directed force, wherein
the security channel comprises an ejector being inflatable to eject the single guidewire out of the slit and out of the introducer,
wherein the security channel includes
a first retainer disposed on one side of the slit; and
a second retainer disposed on another side of the slit, the first and the second retainers being configured to avoid externalization of the single guidewire when the ejector is not inflated, the first and the second retainers being configured to decrease an inside diameter of the security channel as measured inside the security channel on either side of the slit.
2. The assembly according to claim 1 , wherein the ejector is located radially closer to a central longitudinal axis of the introducer than the single guidewire.
3. The assembly according to claim 1 , wherein the ejector comprises an expandable element configured to swell as a consequence of fluid or moisture uptake.
4. The assembly according to claim 3 , wherein the expandable element comprises a fluid absorbing and swellable material.
5. The assembly according to claim 3 , wherein the expandable element is in communication with a fluid reservoir.
6. The assembly according to claim 1 , wherein the introducer further comprises a passageway formed along a length of the longitudinal extent.
7. The assembly according to claim 6 , wherein the passageway provides a communication path for a fluid between an expandable element and a fluid reservoir.
8. The assembly according to claim 1 , wherein the proximal hole in the introducer is located in a proximal-most end of the introducer.
9. The assembly according to claim 1 , wherein
a distance between the first retainer and the second retainer is shorter than a diameter of the single guidewire.
10. The assembly according to claim 1 , wherein
the first retainer protrudes radially inward toward a central longitudinal axis of the security channel; and
the second retainer protrudes radially inward toward the central longitudinal axis of the security channel.
11. The assembly according to claim 1 , wherein
the first retainer and the second retainer are triangular in a cross-sectional view.
12. The assembly according to claim 1 , wherein
the first retainer and the second retainer are in contact with the single guidewire when the ejector is not inflated.
13. The assembly according to claim 1 , wherein the ejector comprises a balloon configured to be expanded by injection of a fluid.
14. The assembly according to claim 1 , the introducer comprising a passageway extending between the proximal end and the distal end of the introducer, wherein
the passageway is separate from the security channel, the passageway is disposed radially across a central longitudinal axis of the introducer from the security channel, the passageway has a same radius as the security channel, and the passageway is circumferentially enclosed without a longitudinal slit.