| 摘要 |
A transurethral needle ablation device (31) for the treatment of the prostate of a human male, using radio frequency energy from a radio frequency power source, the human male having a bladder with a base, a prostate and a penis with a urethra therein formed by an urethral wall extending from the base of the bladder through the prostate and the penis along a longitudinal axis, with the prostate having prostatic tissue surrounding the urethral wall near the base of the bladder, said device comprising: a sheath (32) having proximal and distal extremities and having a lumen extending from the proximal extremity to the distal extremity; a guide tube (51, 52) slidably mounted in the lumen in the sheath and having proximal (33) and distal (34) extremities and having a lumen extending from the proximal extremity to the distal extremity and having a longitudinal axis; a needle electrode (81, 82) slidably mounted in the lumen of the guide tube and having proximal and distal extremities; insulation means coaxially disposed on the needle electrode; handle means adapted to be gripped by the human hand, means for mounting the proximal extremity of the guide tube on the handle means, the handle means including means for causing bending of the distal extremity of the guide tube at an angle with respect to the longitudinal axis, whereby the lumen in the guide tube can be directed so that it faces the urethral wall; means connected to the needle electrode adapted to be coupled to the radio frequency power source for supplying radio frequency energy to the needle electrode; means carried by the handle means and coupled to the needle electrode and the insulation means for advancing and retracting the needle electrode with respect to the guide tube whereby, when the sheath is positioned in the urethra with its distal extremity in the vicinity of the prostate, the needle electrode can be advanced through the urethral wall and into the tissue of the prostate and the insulation means advanced through the urethral wall while leaving a preselected length of the needle electrode exposed in the tissue of the prostate; whereby, upon the application of radio frequency energy to the needle electrode, tissue of the prostate surrounding the needle electrode is ablated to form a lesion in the tissue of the prostate while the urethral wall is protected from the radio frequency energy by the insulation means. |
