Ureteral access sheath
View Patent ↗A ureteral access sheath adapted for insertion into a urethra includes an elongate tube extending between a proximal end and a distal end. A handle assembly is disposed at the proximal end and includes enlarged portions which inhibit migration of the sheath into the urethra. The enlarged portions are shaped like the bell of a horn with a concave, distally-facing outer surface and a convex, proximally-facing inner surface. The inner surface functions as a funnel while the outer surface is sized and configured to receive adjacent fingers of a user's hand held in its natural position. In an associated method, this shape of the handle assembly facilitates maintaining the sheath in a stationary position during insertion and removal of instrumentation. The handle assembly can be movable on the tube to facilitate variation of the sheath link in situ.
1. A method for inserting a medical instrument into a urethra, comprising the steps of:
providing a urethral access device having an elongate tube with a lumen extending along an axis between a proximal end and a distal end, and a handle at the proximal end of the tube;
configuring the handle with a distally-facing, concave surface and proximally-facing surface, the distally-facing surface being sized and configured to receive two adjacent fingers of a user's hand;
inserting the distal end of the tube into the urethra to an operating position in order to provide access for the medical device;
moving the medical device distally into the proximal end of the lumen of the tube and through the lumen of the tube into the urethra;
during the moving step creating a distal force on the urethral access device; and
applying a proximal force on the distally-facing surface of the handle to oppose the distal force and maintain the access sheath in the operative position.
2. The method recited in claim 1 wherein the configuring step further comprises the step of:
forming the proximally-facing surface with a convex configuration.
3. The method recited in claim 1 further comprising the step of:
moving the handle distally axially along the tube beyond a predetermined position;
removing a portion of the tube extending generally proximally of the predetermined position; and
moving the handle axially proximally to the predetermined position along the tube.
4. The method recited in claim 3 further comprising the steps of:
facilitating a generally fixed relationship between the handle and the tube at the predetermined position.
5. The method recited in claim 4 wherein the facilitating step comprises the 2 steps of;
mounting a sleeve with an elastomeric washer on the tube; and
screwing the handle onto the sleeve.
6. A method for assembling a medical access device, comprising the steps of:
providing an elongate tube having a working channel;
providing an elastomeric washer with a lumen sized to receive the elongate tube;
providing a sleeve having external threads and configured to mount the elongate tube;
disposing the elastomeric washer within the sleeve;
mounting the sleeve and the elastomeric washer onto the elongate tube;
forming a handle assembly with a nut having internal threads configured to mate with the external threads of the sleeve, the nut being configured to compress the elastomeric washer; and
coupling the handle assembly to the sleeve such that the nut compresses the elastomeric washer, coupling the handle assembly to the sleeve including screwing the handle assembly onto the sleeve.
7. The method recited in claim 6 , wherein the step of forming a handle assembly with a nut comprises the step of forming the nut as a cylinder.
8. The method recited in claim 6 , wherein the step of coupling the handle assembly to the sleeve such that the nut compresses the washer comprises the step of decreasing a diameter of the lumen.