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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0333920 (2008-12-12) |
등록번호 | US-8355799 (2013-01-15) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 26 인용 특허 : 480 |
Joint temperature monitoring and control systems and methods are described herein in which the temperature of a fluid within a body or joint space is determined and/or monitored despite the energy generated during treatment by an ablation probe. One or more temperature sensors are positioned along t
Joint temperature monitoring and control systems and methods are described herein in which the temperature of a fluid within a body or joint space is determined and/or monitored despite the energy generated during treatment by an ablation probe. One or more temperature sensors are positioned along the probe proximally of the electrode assembly and measure the temperature of an electrically conductive fluid without being overly influenced by the surgical effect occurring proximate the electrode assembly. The controller coupled to the probe can also be configured to set temperature limits and treatment times as well as moderating joint temperature by altering the electrically conductive fluid flow.
1. An apparatus for treating tissue at a target site within a body or joint space comprising: an electrosurgical probe having a shaft with a distal end and a proximal end, the probe further comprising an active electrode terminal disposed near the distal end;a high frequency power supply, the high f
1. An apparatus for treating tissue at a target site within a body or joint space comprising: an electrosurgical probe having a shaft with a distal end and a proximal end, the probe further comprising an active electrode terminal disposed near the distal end;a high frequency power supply, the high frequency power supply coupled to the active electrode terminal;a return electrode coupled to the high frequency power supply, the high frequency power supply configured to generate an electric field between the active electrode terminal and the return electrode, the electric field generates an electrosurgical ablative effect at the active electrode; anda temperature sensor spaced away from the active electrode and the return electrode such that the temperature of an electrically conductive fluid within the body or joint space is measured without regard to any influence from energy generated by the electrosurgical ablative effect. 2. The apparatus of claim 1 wherein the temperature sensor is spaced a distance away from the distal tip. 3. The apparatus of claim 2 wherein the distance is at least 5 mm. 4. The apparatus of claim 1 wherein the temperature sensor is mounted on the shaft. 5. The apparatus of claim 1 wherein the temperature sensor is spaced proximally from the active electrode terminal. 6. The apparatus of claim 1 wherein the electrically conductive fluid located at the target site provides a current path between the active electrode terminal and the return electrode and wherein the temperature sensor is electrically insulated from the electrically conductive fluid. 7. The apparatus of claim 1, the high frequency power supply further comprising: a microprocessor for controlling the apparatus; andan analog-to-digital converter for converting the measured temperature to a digital signal readable by the microprocessor. 8. The apparatus of claim 7 wherein the microprocessor is pre-programmed with a series of temperature limits. 9. The apparatus of claim 1 wherein the temperature sensor is a thermocouple. 10. The apparatus of claim 9 wherein the thermocouple is a T type thermocouple. 11. The apparatus of claim 1 wherein the temperature sensor is a thermistor. 12. The apparatus of claim 1 wherein the temperature sensor is a resistance temperature detector. 13. The apparatus of claim 7 wherein the microprocessor is configured for monitoring and controlling a power output as compared to the temperature of the electrically conductive fluid. 14. The apparatus of claim 1, further comprising a fluid aspiration element for aspirating the fluid from the target site. 15. The apparatus of claim 14 wherein the sensor is thermally insulated from the fluid aspiration element. 16. The apparatus of claim 14 wherein the temperature sensor is positioned within the fluid aspiration element. 17. The apparatus of claim 1, wherein the target site comprises a joint in a patient body. 18. The apparatus of claim 1, further comprising a fluid delivery element for delivering the electrically conductive fluid to the target site. 19. The apparatus of claim 18 wherein the fluid delivery element comprises a pump, and wherein the pump is operable to control fluid inflow to the target site and fluid outflow from the target site. 20. The apparatus of claim 19 wherein the pump regulates the fluid inflow and the fluid outflow in order to maintain the temperature of the fluid below a predetermined level. 21. A method for treating tissue at a target site comprising: delivering an electrically conductive fluid to the target site in a patient's body or joint space;positioning an electrosurgical instrument adjacent to the target site, the electrosurgical instrument comprising an active electrode terminal and a return electrode;applying a high frequency voltage between the active electrode terminal and the return electrode wherein the electrically conductive fluid provides a conductive path between the active electrode terminal and the return electrode for generating an electric field in the vicinity of the target tissue;applying the electric field to create an electrosurgical ablative effect on the target tissue;sensing a temperature of the electrically conductive fluid in the body or joint space without influence from energy generated by the electrosurgical ablative effect; andcontrolling the high frequency voltage applied between the active electrode terminal and the return electrode based on the temperature of the electrically conductive fluid. 22. The method of claim 21 wherein the temperature of the electrically conductive fluid is sensed at a position spaced away from the active electrode terminal. 23. The method of claim 22, further comprising: comparing the temperature to a desired temperature range; andadjusting the voltage based on the temperature. 24. The method of claim 23, wherein the desired temperature range is selected according to a tissue type or a procedure type. 25. The method of claim 22, further comprising: delivering a circulating flow of the fluid to the body structure;comparing the temperature to a desired temperature range; andadjusting the circulating flow of the fluid based on the temperature. 26. The method of claim 21, wherein the step of sensing further comprises correlating a target tissue temperature from the sensed fluid temperature. 27. A tissue treatment apparatus, comprising: an electrosurgical probe having an elongate shaft with an electrode assembly positioned near or at a distal end of the shaft, the electrode assembly comprises an active electrode and a return electrode; andat least one temperature sensor positioned at a distance proximally of the electrode assembly within or along the shaft, whereby the at least one temperature sensor detects a temperature of the electrically conductive fluid while unaffected by a current traveling between the active electrode and the return electrode and without regard to any influence from energy generated by an electrosurgical ablative effect at the active electrode. 28. The apparatus of claim 27 wherein the at least one temperature sensor comprises a thermocouple, thermistor, or resistance temperature detector. 29. The apparatus of claim 27 wherein the distance is at least 5 mm. 30. The apparatus of claim 27 wherein the at least one temperature sensor is electrically insulated from the electrically conductive fluid. 31. The apparatus of claim 27 wherein the at least one temperature sensor is thermally insulated from the elongate shaft. 32. The apparatus of claim 27 further comprising a high frequency power supply electrically coupled to the electrode assembly. 33. The apparatus of claim 27 further comprising a controller coupled to the probe. 34. The apparatus of claim 33, wherein the controller further comprises: a microprocessor for controlling the apparatus; andan analog-to-digital converter for converting the measured temperature to a digital signal readable by the microprocessor. 35. The apparatus of claim 34 wherein the microprocessor is pre-programmed with a series of temperature limits.
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