Detection mechanism, radio-frequency ablation catheter, and radio-frequency ablation system

Abstract

The present invention provides a detection mechanism, a radio-frequency ablation catheter, and a radio-frequency ablation system. The radio-frequency ablation catheter comprises a handle portion (2), a needle tube portion (1), a central electrode (3), and a detection mechanism. The needle tube portion (1) comprises a first tube sleeve (11) and a second tube sleeve (12), the handle portion (2) comprises a cylinder sleeve (21) and a sliding button (22), the central electrode (3) comprises an electrode body (31), an electrode wire (26), and an electrode connector (23), and the detection mechanism comprises a fixing base (5), a traction wire, a connecting base (6), and multiple claw-shaped electrodes (7). A distal end of the traction wire is fixed on the fixing base (5), and a proximal end of the traction wire is fixed on the sliding button (22); and the claw-shaped electrodes (7) are fixed on the fixing base (5), and slidably provided in the connecting base (6). The traction wire is pulled by the sliding button (22) to drive the fixing base (5) to push the claw-shaped electrodes (7) in or out of the connecting base (6). This facilitates the control of the claw-shaped electrodes (7) by a user during surgery, the determination of the temperature or impedance of the claw-shaped electrodes (7), and thus the determination of the progress of ablation.

What is claimed is: 
     
         1 . A detection mechanism, for use in a radio-frequency ablation catheter, comprising a fixing base, a traction wire, a connecting base and multiple claw-shaped electrodes, wherein the fixing base is provided with multiple mounting holes, and each of the claw-shaped electrodes extends through the mounting hole and is fixedly connected to the fixing base respectively;
 a distal end of the traction wire is fixed to the fixing base;   the connecting base is provided with multiple guide holes, wherein the openings of adjacent guide holes extend in the same direction, each of the claw-shaped electrodes extends through the guide hole respectively, and the guide holes allow the claw-shaped electrodes to extend out of the connecting base in a dispersed manner; and   each of the claw-shaped electrodes comprises: a first section, a second section, and a third section, wherein the second section is at an obtuse angle with respect to the first section, and the third section is at an obtuse angle with respect to the second section, wherein when the claw-shaped electrodes extend out of the connecting base in a dispersed manner, the claw-shaped electrodes stretch out, and distal ends of the claw-shaped electrodes are located on the same latitude.   
     
     
         2 . The detection mechanism according to  claim 1 , further comprising a fixing ring, wherein a distal end of the fixing ring is fixed on the claw electrode, and a proximal end of the fixing ring is externally connected to a wire, allowing the wire and the claw-shaped electrodes to be electrically connected. 
     
     
         3 . The detection mechanism according to  claim 1 , wherein the distance between adjacent guide holes is the same. 
     
     
         4 . The detection mechanism according to  claim 1 , wherein the distance between opposing guide holes is different. 
     
     
         5 . A radio-frequency ablation catheter, comprising a handle portion, a needle tube portion, a central electrode, and a detection mechanism according to any one of  claims 1  to  4 , wherein the needle tube portion comprises a first tube sleeve and a second tube sleeve, wherein the connecting base is specifically mounted between the first tube sleeve and the second tube sleeve, the fixing base is specifically slidably mounted in the first tube sleeve, and the fixing ring and the multiple claw-shaped electrodes are located inside the first tube sleeve;
 the handle portion comprises a cylinder sleeve and a sliding button, wherein 
 the sliding button is slidably mounted on the cylinder sleeve, and 
 a proximal end of the traction wire is fixed on the sliding button; and 
 the central electrode comprises an electrode body, an electrode wire, and an electrode connector, wherein 
 the electrode body is provided at a distal end of the second tube sleeve, a distal end of the electrode wire is electrically connected to the electrode body, the electrode wire extends through the cylinder sleeve, the first tube sleeve and the second tube sleeve, a proximal end of the electrode wire is electrically connected to the electrode connector, and the electrode connector is located outside the cylinder sleeve. 
 
     
     
         6 . The radio-frequency ablation catheter according to  claim 5 , further comprising a liquid injection joint and a liquid injection tube, wherein
 the liquid injection tube extends through the cylinder sleeve, the fixing base and the connecting base, the electrode body is provided with a liquid inlet, and a distal end of the liquid injection tube is in communication with the liquid inlet; and   the liquid injection joint is provided at a proximal end of the liquid injection tube, and located outside the cylinder sleeve.   
     
     
         7 . The radio-frequency ablation catheter according to  claim 6 , wherein sprinkler channels are provided in the electrode body, wherein the sprinkler channels are in communication with the liquid inlet, and the sprinkler channels are used to dispersely feed the liquid at the liquid inlet. 
     
     
         8 . The radio-frequency ablation catheter according to  claim 7 , wherein an infiltration hood is provided outside the electrode body, wherein the infiltration hood comprises a plurality of dispersing holes distributed in a rectangular array, and the hole diameters of each row of dispersing holes decrease in a direction from the proximal end to the distal end. 
     
     
         9 . The radio-frequency ablation catheter according to  claim 8 , wherein the dispersing hole and the sprinkler channel are arranged misaligned. 
     
     
         10 . The radio-frequency ablation catheter according to  claim 8 , wherein the electrode body comprises: a cylindrical portion and a tapered portion, wherein the tapered portion is located at a distal end of the cylindrical portion, and the infiltration hood is mounted around the cylindrical portion. 
     
     
         11 . The radio-frequency ablation catheter according to  claim 10 , wherein the electrode body is provided with a temperature sensor and a signal conduit therein, and
 a wiring hole is provided on the electrode body, wherein the temperature sensor is located in the tapered portion, the signal conduit extends through the wiring hole, an insulating layer is provided outside the signal conduit, a distal end of the signal conduit is electrically connected to the temperature sensor, and a proximal end of the signal conduit is electrically connected to the electrode connector.   
     
     
         12 . The radio-frequency ablation catheter according to  claim 10 , wherein a slot is provided on the electrode body, and the distal end of the second tube sleeve is inserted into the slot. 
     
     
         13 . The radio frequency ablation catheter according to any one of  claims 8  to  12 , wherein the infiltration hood is made of a high-temperature resistant insulating material. 
     
     
         14 . The radio-frequency ablation catheter according to  claim 5 , wherein the second tube sleeve is provided with an internal thread, the connecting base is provided with an external thread, and the second tube sleeve and the connecting base are threadedly connected. 
     
     
         15 . The radio-frequency ablation catheter according to  claim 5 , wherein the first tube sleeve is provided with a counterbore, a threaded hole is provided at the proximal end of the connecting base, and the first tube sleeve and the connecting base are connected by a bolt. 
     
     
         16 . The radio-frequency ablation catheter according to  claim 5 , wherein the connecting base comprises a liquid injection hole, wherein the liquid injection hole is positioned along the center line of the connecting base, the liquid injection tube extends through the liquid injection hole, and the guide holes are symmetrically distributed with the liquid injection hole as a center;
 and the guide hole comprises a straight section and an arc section, wherein the arc section is located at a distal end of the straight section.  17 . The radio-frequency ablation catheter according to  claim 16 , wherein an anti-skid pattern is provided on an inner side wall of the straight section of the guide hole.   
     
     
         18 . The radio-frequency ablation catheter according to  claim 16 , wherein an anti-wear cushion is provided on an inner side wall of each arc section, wherein the anti-wear cushion is made of a rubber material. 
     
     
         19 . The radio-frequency ablation catheter according to  claim 16 , wherein the connecting base is made of glass fibers. 
     
     
         20 . The radio-frequency ablation catheter according to  claim 16 , wherein a mounting post is provided at the proximal end of the connecting base, and a spring is mounted around the mounting post, wherein when the fixing base moves toward the connecting base, a distal end of the spring presses against the connecting base, and a proximal end of the spring presses against the fixing base. 
     
     
         21 . The radio-frequency ablation catheter according to  claim 5 , wherein the multiple claw-shaped electrodes are hollow tubes. 
     
     
         22 . The radio-frequency ablation catheter according to  claim 5 , wherein an insulating layer is provided around an outer surface of the first sections of the claw-shaped electrodes. 
     
     
         23 . The radio-frequency ablation catheter according to  claim 5 , wherein an insulating layer is provided around an outer surface of the second sections of the claw-shaped electrodes. 
     
     
         24 . The radio-frequency ablation catheter according to  claim 5 , wherein the first section and the second section are both straight sections, and the third section is an arc section. 
     
     
         25 . The radio-frequency ablation catheter according to  claim 5 , wherein a first groove is respectively provided on both sides of the fixing base, a fixture block is provided at the distal end of the traction wire, and the fixture block is inserted in the first groove, to allow the traction wire and the fixing base to be fixedly connected. 
     
     
         26 . The radio-frequency ablation catheter according to  claim 5 , wherein the fixing base is made of an electric ceramic material. 
     
     
         27 . The radio-frequency ablation catheter according to  claim 5 , wherein the fixing ring and the fixing base are joined by interference fit to limit the extending length of the claw-shaped electrode. 
     
     
         28 . The radio-frequency ablation catheter according to  claim 5 , wherein the fixing ring is made of a silicone rubber material. 
     
     
         29 . The radio-frequency ablation catheter according to  claim 28 , wherein the fixing ring is a hollow cylinder, and the fixing ring is provided with a slit. 
     
     
         30 . The radio-frequency ablation catheter according to  claim 5 , wherein both ends of the fixing ring are provided with a buffering cushion. 
     
     
         31 . The radio-frequency ablation catheter according to  claim 30 , wherein the buffering cushion is made of an elastic rubber material. 
     
     
         32 . The radio-frequency ablation catheter according to  claim 5 , wherein the fixing base comprises a female fixing base and a male fixing ring joined to each other. 
     
     
         33 . The radio-frequency ablation catheter according to  claim 32 , wherein the female fixing ring and the male fixing ring are hinged by a hinge shaft. 
     
     
         34 . A radio frequency ablation system, comprising a radio-frequency ablation catheter according to any one of  claims 5  to  33 .