Handle and cartridge system for medical interventions

1 . A system for delivering an implant to a prostate, comprising:

a delivery device comprising an elongate tubular member configured to be advanced through a urethra and having a distal portion defining an inner lumen connected to an exit port;

a needle assembly slidably disposed within the elongate tubular member and having a needle distal portion that is shape-set into a curved configuration and configured to extend through the inner lumen and the exit port; and

an implant positioned within the needle distal portion,

wherein the distal portion of the elongate tubular member defines a cutout portion positioned proximally to the exit port, the cutout portion configured to accommodate outward protrusion of a portion of the needle distal portion,

wherein the needle distal portion is configured to be extended through the elongate tubular member in a constrained configuration that is straightened relative to the curved configuration, and

wherein upon being extended distally through the exit port, the needle distal portion assumes the curved configuration.

2 . The system of claim 1 , wherein the curved configuration of the needle distal portion has a pre-determined radius of curvature.

3 . The system of claim 1 , wherein at least a portion of the inner lumen has an effective radius of curvature that is transverse to a long axis of the elongate tubular member.

4 . The system of claim 3 , wherein the effective radius of curvature of the inner lumen matches a desired exit trajectory of the needle distal portion.

5 . The system of claim 1 , wherein outward protrusion of the portion of the needle distal portion reduces a constraining force on the distal needle portion.

6 . The system of claim 1 , wherein the inner lumen comprises a distal wall positioned between the exit port and the cutout portion, the distal wall having a radius of curvature that is tangential to a desired exit trajectory of the needle distal portion.

7 . The system of claim 1 , wherein the inner kunen comprises a distal wall positioned between the exit port and the cutout portion, the distal wall having a straight section that is tangential to a desired exit trajectory of the needle distal portion.

8 . The system of claim 1 , wherein the inner lumen comprises a distal wall positioned between the exit port and the cutout portion, the distal wall positioned proximal to an upper cutout portion further defined by the distal portion of the elongate tubular member.

9 . The system of claim 1 , wherein the inner lumen has a tapered cross-sectional dimension.

10 . The system of claim 1 , wherein the needle assembly further comprises a proximal portion configured to engage a handle coupled to a proximal end of the elongate tubular member.

11 . The system of claim 1 , where the needle distal portion is more flexible than the elongate tubular member.

12 . A system for delivering an implant to a prostate, comprising:

a delivery device comprising an elongate tubular member configured to be advanced through a urethra and having a distal portion defining an inner lumen connected to an exit port;

a needle assembly slidably disposed within the elongate tubular member and having a needle distal portion that is shape-set into a curved configuration and configured to extend through the inner lumen and the exit port; and

an implant positioned within the needle distal portion,

wherein the inner lumen has a tapered cross-sectional dimension,

wherein the needle distal portion is configured to be extended through the elongate tubular member in a constrained configuration that is straightened relative to the curved configuration, and

wherein upon being extended distally through the exit port, the needle distal portion assumes the curved configuration.

13 . A method for treating benign prostatic hypertrophy, comprising:

advancing an elongate tubular member of a delivery device through a urethra until a distal portion of the elongate tubular member is positioned within a prostatic urethra, the distal portion of the elongate tubular member defining an inner lumen connected to an exit port;

advancing a needle assembly containing a prostatic implant through the elongate tubular member of the delivery device until a needle distal portion that is shape-set into a curved configuration is extended distally through the inner lumen and the exit port, wherein the needle distal portion is configured to be extended through the elongate tubular member in a constrained configuration that is straightened relative to the curved configuration such that the needle distal portion assumes the curved configuration upon being extended distally through the exit port, wherein the distal portion of the elongate tubular member defines a cutout portion positioned proximally to the exit port, the cutout portion configured to accommodate outward protrusion of a portion of the needle distal portion;

penetrating a prostate gland with the needle distal portion and advancing the needle assembly distally until the needle distal portion is advanced through an outer capsule of the prostate gland; and

retracting the needle distal portion proximally relative to the implant until the implant is unsheathed at the prostate gland.

14 . The method of claim 13 , wherein the curved configuration of the needle distal portion has a pre-determined radius of curvature.

15 . The method of claim 13 , wherein the inner lumen has an effective radius of curvature that is transverse to a long axis of the elongate tubular member.

16 . The method of claim 13 , wherein outward protrusion of the portion of the needle distal portion reduces a constraining force on the distal needle portion.

17 . The method of claim 13 , wherein the inner lumen comprises a distal wall positioned between the exit port and the cutout portion, the distal wall having a radius of curvature that is tangential to a desired exit trajectory of the needle distal portion.

18 . The method of claim 13 , wherein the inner lumen comprises a distal wall positioned between the exit port and the cutout portion, the distal wall having a straight section that is tangential to a desired exit trajectory of the needle distal portion.

19 . The method of claim 13 , wherein penetrating a prostate gland with the needle distal portion comprises engaging a proximal portion of the needle assembly with a handle coupled to a proximal end of the elongate tubular member.