CN-224206882-U - Steam ablation needle

CN224206882UCN 224206882 UCN224206882 UCN 224206882UCN-224206882-U

Abstract

The application provides a steam ablation needle which can integrate pressure-temperature noninvasive monitoring functions. One end of the ablation needle is fixedly connected with a double-layer stainless steel vacuum tube, the other end of the double-layer stainless steel vacuum tube is fixed on the head of the reducer union, the tail end thread of the reducer union is fixed with the front end thread of the PEEK pipe joint, the PEEK pipe joint is provided with a pressure-temperature monitoring probe inlet, the pressure-temperature monitoring probe head extends to the head of the ablation needle, the inside of the PEEK pipe joint is connected with a steam transmission stainless steel tube, one end of the steam transmission stainless steel tube is connected with the inside of the PEEK pipe joint, and the other end of the steam transmission stainless steel tube is connected with a steam generator. The application can realize continuous and stable steam ablation, measure the steam pressure and the temperature of the ablation center, and realize accurate assessment of steam thermal ablation.

Inventors

JIN XIAOFEI
Su Liangxinyu
YANG JIN
DING JIANGUO
WANG HOUTIAN
CHEN JIE
WEI WAI
QIAN ZHIYU

Assignees

南京航空航天大学

Dates

Publication Date: 20260508
Application Date: 20250114

Claims (6)

1. The steam ablation needle is characterized by comprising an ablation needle head, a double-layer stainless steel vacuum tube, a reducer union, a pressure-temperature monitoring probe, a PEEK pipe joint, a steam transmission stainless steel tube and a rubber heat insulation pipe sleeve; The ablation needle is provided with a steam outlet, the front end of the ablation needle is provided with an opening, and the tail end of the ablation needle is fixedly connected to one end of the double-layer stainless steel vacuum tube; The other end of the double-layer stainless steel vacuum tube is fixed on the head of the reducer union, and the tail end of the reducer union is fixedly connected with the front end of the PEEK pipe joint through threads; Two holes are formed in the PEEK pipe joint and are respectively connected with the pressure-temperature monitoring probe and the steam transmission stainless steel pipe, and the head of the pressure-temperature monitoring probe penetrates through the double-layer stainless steel vacuum pipe from the opening of the PEEK pipe joint and then stretches out from the front end opening of the ablation needle; one end of the steam transmission stainless steel pipe is connected to the inside of the PEEK pipe joint, and the other end of the steam transmission stainless steel pipe is connected to a steam generator in an extending mode; The rubber heat insulation pipe sleeve is wrapped outside the steam transmission stainless steel pipe.
2. The steam ablation needle of claim 1, wherein the ablation needle comprises a puncture needle tip and a puncture needle rod, the total length of the ablation needle is 28mm, the puncture needle tip is a hollow cone, the puncture needle rod is a hollow cylinder, the inner diameters of the puncture needle tip and the puncture needle rod are 1.8mm, and the outer diameters of the puncture needle tip and the puncture needle rod are 2.0mm.
3. The steam ablation needle according to claim 2, wherein the head of the puncture needle tip is provided with a pressure-temperature monitoring probe outlet, the pressure-temperature monitoring probe outlet is a round hole with the diameter of 1mm, the periphery of the puncture needle rod is provided with steam outlets which are uniformly distributed, 15 steam outlets are arranged in a row in the axial direction of the puncture needle rod, the distance between adjacent holes is 0.2mm, 8 steam outlets are arranged in a circle in the circumferential direction of the puncture needle rod, the distance between adjacent holes is 45 degrees, and the diameter of each steam outlet is 0.2mm.
4. The steam ablation needle of claim 1, wherein the outer catheter of the pressure-temperature monitoring probe has a maximum diameter of 1.2mm, a wire length of 200mm, a pressure measurement range of 10-150 mmhg, and a temperature measurement range of 15-180 ℃.
5. The steam ablation needle according to claim 1, wherein a pressure measuring wafer and a thermistor are placed at the head of the pressure-temperature monitoring probe, the pressure measuring wafer is a MEMS half-bridge micro-pressure sensor based on the piezoresistive effect of silicon, a Wheatstone bridge is formed by externally lapping two resistors, the pressure is measured by acquiring an electric signal of a part to be measured, the B value of the thermistor is 3950, the resistance is 10KΩ, the temperature is measured in real time, the pressure measuring wafer and the thermistor are placed in a titanium alloy probe shell with a window on the surface, electrical isolation and protection are carried out by silica gel, and an interface of the sensor is connected to a pressure-temperature acquisition plate.
6. The steam ablation needle according to claim 1, wherein the tail end of the reducer union is provided with internal threads, the front end of the PEEK pipe joint is provided with external threads, the tail end of the reducer union is in threaded connection with the front end of the PEEK pipe joint, the front end outlet of the PEEK pipe joint is flexible and is screwed into the reducer union through an external threaded structure, the reducer union is provided with a gradually reduced inner diameter, the tail end of the PEEK pipe joint is provided with a PEEK pipe joint and a steam transmission stainless steel pipe joint and a PEEK pipe joint and a pressure-temperature monitoring probe joint, the PEEK pipe joint and the steam transmission stainless steel pipe joint are horizontally arranged, and the PEEK pipe joint and the pressure-temperature monitoring probe joint are obliquely arranged.

Description

Steam ablation needle Technical Field The application relates to the technical field of steam thermal ablation, in particular to a steam ablation needle. Background In the steam ablation process, the gas pressure of the steam outlet directly influences the deformation of tissues, and the excessive pressure easily causes the tearing of the tissues to influence the form of an ablation area. Therefore, the adoption of the pressure sensor for monitoring and controlling the steam pressure in real time is a key measure for evaluating the ablation effect. The temperature determines whether the cells at the ablation site are completely inactivated. Taking liver tissue as an example, tissue cells are completely inactivated at 60 ℃, so that effective ablation can be realized, and the tissue carbonization can be caused at the temperature above 130 ℃. Therefore, if the temperature of the ablation center can be detected in a non-invasive manner while the ablation is performed, and the temperature is controlled to be 60-130 ℃, the carbonization phenomenon caused by overhigh temperature can be avoided. Currently, a steam ablation needle integrating pressure-temperature noninvasive detection functions is lacking. Disclosure of utility model The application provides a steam ablation needle which can accurately monitor the pressure and the temperature of an ablation center target point while performing thermal ablation, so as to realize accurate evaluation of thermal ablation. The application provides a steam ablation needle, which comprises an ablation needle head, a double-layer stainless steel vacuum tube, a reducer union, a pressure-temperature monitoring probe, a PEEK pipe joint, a steam transmission stainless steel tube and a rubber heat insulation pipe sleeve; The ablation needle is provided with a steam outlet, the front end of the ablation needle is provided with an opening, and the tail end of the ablation needle is fixedly connected to one end of the double-layer stainless steel vacuum tube; The other end of the double-layer stainless steel vacuum tube is fixed on the head of the reducer union, and the tail end of the reducer union is fixedly connected with the front end of the PEEK pipe joint through threads; Two holes are formed in the PEEK pipe joint and are respectively connected with the pressure-temperature monitoring probe and the steam transmission stainless steel pipe, and the head of the pressure-temperature monitoring probe penetrates through the double-layer stainless steel vacuum pipe from the opening of the PEEK pipe joint and then stretches out from the front end opening of the ablation needle; one end of the steam transmission stainless steel pipe is connected to the inside of the PEEK pipe joint, and the other end of the steam transmission stainless steel pipe is connected to a steam generator in an extending mode; The rubber heat insulation pipe sleeve is wrapped outside the steam transmission stainless steel pipe. Optionally, in the application, the ablation needle comprises a puncture needle tip and a puncture needle rod, the total length of the ablation needle is 28mm, the puncture needle tip is a hollow cone, the puncture needle rod is a hollow cylinder, the inner diameters of the puncture needle tip and the puncture needle rod are 1.8mm, and the outer diameters of the puncture needle tip and the puncture needle rod are 2.0mm. Optionally, in the application, the head of the puncture needle tip is provided with a pressure-temperature monitoring probe outlet, the pressure-temperature monitoring probe outlet is a round hole with the diameter of 1mm, the periphery of the puncture needle rod is provided with steam outlets which are uniformly distributed, 15 steam outlets are arranged in a row in the axial direction of the puncture needle rod, the distance between adjacent holes is 0.2mm, 8 steam outlets are arranged in a circle in the circumferential direction of the puncture needle rod, the distance between adjacent holes is 45 degrees, and the diameter of each steam outlet is 0.2mm. Optionally, in the application, the maximum diameter of the outer catheter of the pressure-temperature monitoring probe is 1.2mm, the length of the lead is 200mm, the pressure measurement range is 10-150 mmHg, and the temperature measurement range is 15-180 ℃. Optionally, in the application, a pressure measuring wafer and a thermistor are placed at the head of the pressure-temperature monitoring probe, the pressure measuring wafer is a MEMS half-bridge micro-pressure sensor based on the piezoresistive effect of silicon, a Wheatstone bridge is formed by externally lapping two resistors, the pressure measurement is realized by acquiring an electric signal of a part to be measured, the B value of the thermistor is 3950, the resistance is 10KΩ, the temperature real-time measurement is realized, the pressure measuring wafer and the thermistor are placed in a titanium alloy probe shell with a windowed surface, and are elec