CN114145839A - Radio frequency ablation catheter and posture detection and adjustment method thereof - Google Patents
Radio frequency ablation catheter and posture detection and adjustment method thereof Download PDFInfo
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Abstract
The invention provides a radio frequency ablation catheter and a posture identifying and adjusting method thereof. Wherein the radiofrequency ablation catheter comprises: the ablation electrode is columnar and is positioned at the end part of the tube body. The invention also provides a posture identification and posture adjustment method of the radio frequency ablation catheter, which is used for detecting the contact type of the radio frequency ablation catheter and the heart focus tissue and feeding back to an operator to adjust the posture of the catheter so as to ensure that the catheter and the heart focus tissue are in forward contact. After positive contact, the proper ablation energy and ablation time of the radio frequency ablation instrument are determined, so that the operation safety can be improved, and scabbing and knocking caused by excessive ablation can be reduced.
Description
Technical Field
The invention relates to the technical field of radio frequency ablation catheters, in particular to a radio frequency ablation catheter and a posture identifying and adjusting method thereof.
Background
The radio frequency ablation catheter is the most common minimally invasive interventional technique for treating arrhythmia at present, and the basic principle is as follows: the radiofrequency ablation catheter is sent to a target heart cavity through sheath tubes with different lengths, the focus of origin of arrhythmia is accurately positioned under the guidance of a three-dimensional mapping technology, a columnar ablation electrode at the head end of the catheter is contacted with the focus tissue with effective contact force, and then radiofrequency current is sent through a loop electrode attached to the skin of the body surface of a patient. Radio frequency current flows through lesion tissues below the electrodes through the electrodes to generate heat in the tissues, and when the temperature reaches the degree of coagulation necrosis, the tissues permanently lose electrophysiological activity, and the arrhythmia is cured.
When the ablation electrode sends current to cause the tissue to generate heat, the tissue is passively heated due to the temperature rise of the tissue due to the heat conduction and heat absorption performance of the electrode material. When an electrode is overheated and the blood circulation around the electrode is insufficiently cooled, the underlying tissue of the electrode is easily scabbed, carbon deposits, and even knocking. Therefore, on one hand, the impedance between the electrode and the tissue is increased, and the ablation depth and effect are influenced; on the other hand, it may cause complications such as embolism and perforation.
The ablation effect is greatly influenced by the leaning angle of the catheter and the heart tissue when the head end columnar ablation electrode is in front contact with the heart tissue, namely 90-degree contact.
At present, the electrophysiology radio frequency ablation catheter with a single temperature sensor is usually adopted in the market, and an operator cannot know the attaching angle and the posture of the catheter and the heart tissue at an operation end. On the side of the columnar ablation electrode contacting with the cardiac tissue, the temperature rises fast during ablation because of small impedance, and on the side of the electrode far away from the cardiac tissue, heat is taken away due to blood flow, and the impedance is large, the temperature rises slowly during ablation, so that when ablation, the energy of the ablation instrument is automatically controlled through a single temperature sensor at great risk. The low-temperature part is used for temperature control, so that the electrode is easy to overheat, thus leading to the scabbing, carbon deposition and even knocking of tissues under the electrode, and on the contrary, the high-temperature part is used for temperature control, and the temperature of the electrode is easy to be low and the ablation effect can not be achieved due to the influence of the contact angle. While the length of time for typical catheter ablation is fixed. When the catheter is not in positive contact with the endocardium, an inappropriate length of ablation poses a surgical risk.
Therefore, during the ablation process, it is very important to monitor the contact angle between the catheter and the surface of the heart in real time, adjust the posture, and adjust the ablation energy and the ablation time under the optimal contact angle.
Disclosure of Invention
The technical problem to be solved by the invention is how to identify the contact angle between the radio frequency ablation catheter and the cardiac tissue and guide the radio frequency ablation catheter to be in positive contact with the contacted cardiac tissue when the radio frequency ablation catheter is used for treating arrhythmia, so that the safety of an ablation operation is greatly improved.
The invention provides a radio frequency ablation catheter, comprising: the ablation device comprises a tube body, an ablation electrode and a temperature sensor group, wherein the ablation electrode is columnar and is located at the end part of the tube body. Different parts of the ablation electrode are provided with temperature sensor groups consisting of a plurality of temperature sensors so as to detect the temperatures of different parts of the ablation electrode, wherein the bottom surface of the free end of the ablation electrode is at least provided with an end surface temperature sensor, and the inner side surface of the ablation electrode is at least provided with two side surface temperature sensors at intervals.
The temperature sensor group feeds back the temperature distribution map, so that an operator can master the actual contact posture information of the catheter and the heart tissue, and the catheter is adjusted to the optimal contact effect, thereby achieving the optimal ablation effect.
According to some embodiments of the invention, the plurality of lateral temperature sensors disposed on the inner lateral surface of the ablation electrode are located on the same vertical cross-section of the ablation electrode.
In some embodiments of the present invention, the plurality of lateral temperature sensors disposed on the inner lateral surface of the ablation electrode are located on the same vertical cross section of the ablation electrode and are arranged at equal intervals along the circumferential direction of the ablation electrode.
According to some embodiments of the present invention, the ablation electrode is cylindrical, and the end surface temperature sensor located on the bottom surface of the free end of the ablation electrode is located at the center of the circle of the bottom surface of the free end.
In some embodiments of the invention, a plurality of traction steel wires are arranged inside the tube body and used for adjusting the radio frequency ablation catheter to bend towards different directions.
According to some embodiments of the invention, the temperature sensor is a thermocouple temperature sensor comprised of two different material conductors.
In some embodiments of the invention, the ablation electrode is cylindrical, the diameter of the ablation electrode is 2mm to 4mm, and the maximum dimension of the temperature sensor is no more than 0.2 mm.
According to some embodiments of the invention, the end of the tubular body is provided with a pressure sensor at a location proximal to the radiofrequency ablation electrode.
In some embodiments of the invention, one end of the tube body close to the ablation electrode is provided with a curved plane three-dimensional indicator, and one end of the tube body far away from the ablation electrode is provided with a curved plane indicator.
According to some embodiments of the invention, the outer side of the ablation electrode is provided with a recess, and the recess is provided with a plurality of micro-holes for spraying a cooling medium.
The method for detecting the contact type of the radio frequency ablation catheter is used for detecting the contact type of the radio frequency ablation catheter and comprises the following steps: acquiring temperature values detected by an end surface temperature sensor and a side surface temperature sensor; and comparing the temperature values of the end surface temperature sensor and the side surface temperature sensor to judge the contact type of the radiofrequency ablation catheter.
The temperature value of the temperature sensor is compared, and the actual contact posture information of the catheter and the heart tissue is fed back to the operator, so that the operator can adjust the posture of the catheter, the radio frequency energy is controlled, and the optimal ablation effect is achieved.
According to some embodiments of the invention, the contact types of the radiofrequency ablation catheter include: the forward contact and the lateral contact are compared, the temperature values of the end surface temperature sensor and the side surface temperature sensor are compared, and the contact type of the radiofrequency ablation catheter is judged, wherein the contact type comprises the following steps:
when the temperature values detected by the end surface temperature sensor and the side surface temperature sensor are stable in a preset range, if the temperature value of the end surface temperature sensor is higher than the temperature value of any one side surface temperature sensor by more than a preset value, judging that the contact type is front contact;
and if the temperature value of any one side surface temperature sensor is higher than the end surface temperature sensor by more than a preset value, judging that the contact type is side surface contact.
According to the embodiment of the invention, the method for detecting the contact type of the radio frequency ablation catheter further comprises the following steps: and judging the orientation of the side surface contact of the radiofrequency ablation catheter by comparing the temperature values of the plurality of inner side surface temperature sensors.
According to some embodiments of the invention, determining the orientation of the side contact of the radiofrequency ablation catheter by comparing temperature values of a plurality of side temperature sensors comprises:
the side surface temperature sensors which compare and judge the temperature values of the plurality of side surface temperature sensors are the maximum;
and judging that the side surface of the radio frequency ablation catheter is contacted to the side surface where the side surface temperature sensor with the largest temperature value is located.
The invention also provides a contact adjustment method of the radio frequency ablation catheter, which is used for adjusting the contact of any radio frequency ablation catheter, and the method comprises the following steps: judging whether the contact type of the radiofrequency ablation catheter is front contact or side contact by comparing the temperature values of the end surface temperature sensor and the side surface temperature sensor; when the contact type of the radio frequency ablation catheter is side contact, the radio frequency ablation catheter is adjusted to be in front contact by adjusting the traction steel wire in the catheter body.
By adopting the technical scheme, the invention at least has the following advantages:
firstly, a temperature sensor group is arranged at the ablation electrode end of the radio frequency ablation catheter to form a conical umbrella-shaped array, so that the temperature of the head end and the periphery of the catheter can be accurately measured. The operator can detect the contact posture direction of the ablation electrode and the cardiac tissue through the temperature distribution condition, so that the contact angle is adjusted to the optimal forward contact angle in real time during ablation, the operation safety is improved, and scabbing and knocking caused by excessive ablation are reduced.
Secondly, a three-dimensional space positioning sensor is arranged at the head end of the radiofrequency ablation catheter, and a curved plane three-dimensional indicating mark is arranged for displaying the three-dimensional position of the catheter in the electrophysiology three-dimensional mapping system; a bending plane indicator is arranged at the handle end of the radio frequency ablation catheter and is used for identifying the bending direction of the radian of the front section of the catheter; a plurality of traction steel wires are arranged in the body of the radiofrequency ablation catheter and used for adjusting the radiofrequency ablation catheter to bend towards different directions. The operator combines the three-dimensional indicating mark of the bending plane and the indicating mark of the bending plane, and the orientation of the radio frequency ablation catheter can be easily adjusted through the traction steel wire, so that the safety of the ablation operation is realized.
Drawings
FIG. 1 is a partial perspective view of a radio frequency ablation catheter according to an embodiment of the present invention;
FIG. 2 is a perspective view of a temperature sensor cluster according to an embodiment of the present invention;
FIG. 3 is a top view of a temperature sensor according to an embodiment of the present invention;
FIG. 4 is a schematic view of a radio frequency ablation catheter in positive contact with an interior wall of a heart in accordance with an embodiment of the present invention;
FIG. 5 is a schematic diagram of a lateral contact of a radio frequency ablation catheter with an interior wall of a heart in accordance with an embodiment of the present invention;
FIG. 6 is a schematic view of a pull wire manipulation catheter in a radio frequency ablation catheter in positive contact with an interior wall of a heart in accordance with an embodiment of the present invention;
FIG. 7 is a perspective view of a temperature sensor cluster with two temperature sensors on the sides according to an embodiment of the present invention;
FIG. 8 is a top view of a temperature sensor cluster with two temperature sensors on the sides according to an embodiment of the present invention;
FIG. 9 is a perspective view of a temperature sensor group with four temperature sensors on the side according to an embodiment of the invention;
FIG. 10 is a top view of a temperature sensor cluster with four temperature sensors on the side according to an embodiment of the present invention;
reference numerals
The system comprises a radio frequency ablation catheter 100, an ablation electrode 110, a temperature sensor 120, a signal wire harness 130, a signal wire harness lumen 140 and a traction steel wire 150.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.
The present invention provides a radio frequency ablation catheter 100 comprising: a tube body, an ablation electrode 100 and a temperature sensor group, wherein the ablation electrode 100 is columnar and is located at the end of the tube body, as shown in fig. 1. Different parts of the ablation electrode 100 are provided with a temperature sensor group consisting of a plurality of temperature sensors 120 so as to detect the temperatures of the different parts of the ablation electrode 100, wherein at least one end surface temperature sensor 120 is arranged on the bottom surface of the free end of the ablation electrode 100, and at least two side surface temperature sensors 120 are arranged on the inner side surface of the ablation electrode 100 at intervals.
The ablation electrode 100 of the radiofrequency ablation catheter 100 is close to the inner wall of the heart, and ablation is started by radiofrequency energy under certain contact pressure, such as 20-30 g, and the ablation energy is set within the range of 60-90W. The temperature sensor 120 in the ablation electrode 100 acquires the temperature at the tip of the ablation electrode 100 and around the ablation electrode 100. The bottom surface of the free end of the ablation electrode 100 is in contact with the inner wall of the heart, the impedance is low, the temperature rises quickly after ablation starts, the side edge of the ablation electrode 100 is in contact with blood, the impedance is high, the temperature rises slowly, meanwhile, heat is taken away quickly by blood flow, and the temperature is correspondingly low due to saline cooling.
In the invention, pure platinum or platinum-iridium alloy can be used as the material of the ablation electrode 100, so that the heat transfer performance, namely high heat conductivity, of the ablation electrode 100 is ensured, and the real-time temperature can be more accurately acquired under the condition that the temperature of the ablation electrode 100 is influenced by heart tissues and blood.
In conjunction with fig. 2-3, and fig. 7-10, the number of the temperature sensor 120 sets may be 3 to save the internal space and cost of the ablation electrode 100 to the maximum extent, but may also be extended to 5 sensors 120 or more for more accurately sensing the temperature change around the cylindrical electrode 100. In practice, the number of temperature sensors 120 can be increased or decreased depending on the size of the lumen of the rf ablation catheter 100. Generally, 1 end surface temperature sensor 120 may be disposed on the bottom surface of the ablation electrode 100, and 3 side surface temperature sensors 120 may be disposed on the inner side surface at equal intervals, as shown in fig. 1.
Based on the influence of the heart tissue and blood flow, the contact part of the catheter 100 and the heart tissue has small impedance, the temperature rises quickly during ablation, and the non-contact part of the catheter 100 and the heart tissue takes away most heat due to the blood flow of 37 degrees, so that the temperature is low during ablation. That is, the highest temperature of the ablation electrode 100 generally occurs at the portion of the electrode 100 where the catheter 100 is in direct contact with the tissue, the temperature indication of the end face temperature sensor 120 at the bottom of the ablation electrode 100 will be higher than the temperature indication of the side face temperature sensor 120 at the inside. When the rf ablation catheter 100 is in forward contact with the heart tissue, as shown in fig. 4, the temperatures at the temperature sensors 120 at different locations of the ablation electrode 100 are as follows: firstly, the temperature at the end face temperature sensor 120 is higher than the temperature at the 3 side face temperature sensors 120 by more than 10 ℃; secondly, the temperatures of the 3 side temperature sensors 120 are consistent, and the temperature difference amplitude is within 3 degrees; thirdly, the radiofrequency ablation catheter 100 starts to perform the ablation operation for about 3 seconds, and the temperature of the 3 lateral temperature sensors 120 is stable and does not rise any more.
When the rf ablation catheter 100 is in lateral contact with the heart tissue, as shown in fig. 5, the temperatures at the temperature sensors 120 at different locations of the ablation electrode 100 are represented as follows: firstly, the temperature difference between the temperature at the end surface temperature sensor 120 and the highest temperature among the 3 side surface temperature sensors 120 is within 10 ℃; secondly, the temperatures at the 3 side temperature sensors 120 are not uniform, and the temperature at the side temperature sensor 120 close to the inner wall of the heart is significantly higher than the temperatures at the other 2 side temperature sensors 120. At this point, the rf ablation catheter 100 may be adjusted to be in forward contact with the cardiac tissue.
When the radiofrequency ablation catheter 100 is in forward contact with the cardiac tissue, ablation can be initiated for a prescribed time to complete a single point ablation.
According to the invention, the temperature sensor group is arranged in the radio frequency ablation catheter 100 in a measuring way, so that an operator can judge the contact angle condition of the radio frequency ablation catheter 100 and the inner wall of the heart according to the comparison of temperature distribution, thereby adjusting the direction of the catheter 100, enabling the radio frequency ablation catheter 100 and the heart tissue to be always in the optimal forward contact state, completing the ablation process, improving the operation safety and reducing scabbing and knocking caused by excessive ablation.
The temperature sensor group feeds back the temperature distribution map, so that an operator can master the actual contact posture information of the catheter 100 and the heart tissue, and the catheter 100 is adjusted to the optimal contact effect, thereby achieving the optimal ablation effect.
According to some embodiments of the present invention, the plurality of lateral temperature sensors 120 disposed on the inner lateral surface of the ablation electrode 100 are located on the same vertical cross-section of the ablation electrode 100, as shown in fig. 2 or 3. When the ablation is carried out, the plurality of side temperature sensors 120 are positioned on the same vertical section of the ablation electrode 100, if the radiofrequency ablation catheter 100 is in lateral contact with the inner wall of the heart, the temperature difference of the plurality of side temperature sensors 120 is more obvious, and an operator can judge the contact condition of the radiofrequency ablation catheter 100 and the inner wall of the heart more easily according to the temperature distribution condition.
According to some embodiments of the present invention, the plurality of side temperature sensors 120 disposed on the inner side of the ablation electrode 100 are located on the same vertical section of the ablation electrode 100 and are arranged at equal intervals along the circumferential direction of the ablation electrode 100, so that an operator can easily determine the contact condition between the radiofrequency ablation catheter 100 and the inner wall of the heart according to the temperature distribution condition.
According to some embodiments of the present invention, the ablation electrode 100 has a cylindrical shape, and the end surface temperature sensor 120 located on the bottom surface of the free end of the ablation electrode 100 is provided at the center of the bottom surface of the free end. Under the forward contact of the catheter 100 and the inner wall of the heart, the end surface temperature sensor 120 arranged at the circle center position of the bottom surface of the free end can accurately acquire the temperature of the ablation electrode 100 at the contact point, as shown in fig. 4, an operator can control the energy size and the time length of the radiofrequency instrument according to the temperature, and the safety of an ablation operation can be greatly improved.
According to some embodiments of the present invention, a plurality of pull wires 150 are disposed within the catheter body to adjust the deflection of the rf ablation catheter 100 in different directions. As shown in FIG. 6, the puller wire 150 is mounted at one end in a fixed position inside the catheter body and at one end inside the handle of the RF ablation catheter 100. The pull wire 150 may be bent with a maximum degree of bending of 270 degrees.
According to some embodiments of the present invention, the temperature sensor 120 is a thermocouple temperature sensor 120 composed of two different material conductors. The temperature sensor 120 disposed inside the ablation electrode 100 may employ a thermocouple temperature sensor 120. The basic principle of the thermocouple temperature sensor 120 is that two material conductors with different components form a closed loop, when temperature gradients exist at two ends, current can pass through the loop, electromotive force exists between the two ends at the moment, the loop is connected to a measuring instrument, and after the electromotive force is measured, the temperature of a measured medium can be known.
According to some embodiments of the present invention, the ablation electrode 100 is cylindrical, the ablation electrode 100 has a diameter of 2mm to 4mm, and the maximum dimension of the temperature sensor 120 is no more than 0.2 mm. The diameter of the ablation electrode 100 can be 2.00mm, 2.67mm, 3.34mm, 4.00mm, and the operator can select the diameter according to actual application. The thermocouple sensor 120 has a size of 0.2mm or less.
According to some embodiments of the present invention, a pressure sensor is provided at the end of the catheter body near the location of the rf ablation electrode 100. The contact pressure between the head end of the catheter 100 and the inner wall of the heart can be sensed through the pressure sensor, and after the disease point is reached, the proper contact force is judged through the preset contact pressure, and ablation is started.
According to some embodiments of the present invention, an end of the catheter body proximal to the ablation electrode 100 is provided with a curved planar three-dimensional indicator, and an end of the catheter body distal from the ablation electrode 100 is provided with a curved planar indicator. Generally, the catheter 100 has a three-dimensional spatial positioning sensor at the tip thereof and a curved plane three-dimensional indicator for displaying the three-dimensional position of the catheter 100 in the electrophysiology three-dimensional mapping system. And a bending plane indicator is arranged at the handle end of the catheter 100 and used for indicating the bending direction of the radian of the front section of the catheter 100. The operator can easily adjust the posture of the catheter 100 through the three-dimensional mapping system and the bending plane indicator at the handle end of the catheter 100.
According to some embodiments of the present invention, the outer side of the ablation electrode 100 is provided with a groove having a plurality of micro-holes therein for spraying a cooling medium. The outer side surface of the ablation electrode 100 is provided with a groove, so that the heat dissipation capacity of the surface of the ablation electrode 100 can be improved, and the small micropores are distributed in the groove and used for spraying cloud-like saline water to peripheral blood, so that the one-way circulating cooling effect is enhanced.
The invention provides a method for detecting the contact type of a radio frequency ablation catheter 100, which is used for detecting the contact type of the radio frequency ablation catheter 100 and comprises the following steps: acquiring temperature values detected by the end surface temperature sensor 120 and the side surface temperature sensor; and comparing the temperature values of the end surface temperature sensor 120 and the side surface temperature sensor 120 to judge the contact type of the radiofrequency ablation catheter 100. Generally, the temperature sensor 120 in the ablation electrode 100 is connected with a signal wire bundle 130, and is positioned in a signal wire bundle lumen 140 for transmitting signals, and temperature information is finally displayed at the handle end of the radiofrequency ablation catheter 100.
According to some embodiments of the invention, the contact types of the radiofrequency ablation catheter 100 include: the forward contact and the lateral contact are compared with the temperature values of the end surface temperature sensor 120 and the side surface temperature sensor 120, and the contact type of the radiofrequency ablation catheter 100 is judged, which comprises the following steps: when the temperature values detected by the end surface temperature sensor 120 and the side surface temperature sensor 120 are stable within a preset range, if the temperature value of the end surface temperature sensor 120 is higher than the temperature value of any side surface temperature sensor 120 by more than a preset value, the contact type is determined to be front contact; if the temperature difference range of the temperature of the end surface temperature sensor 120, which is higher than the temperature of any one of the side surface temperature sensors 120, is less than or equal to the preset value, and the temperatures at the plurality of side surface temperature sensors 120 are not consistent, it is determined that the contact type is the side surface contact.
To achieve effective ablation of cardiac lesions, the temperature of the ablation electrode 100 should typically reach above 50 ℃, which increases as the size of the lesion increases, but not above 100 ℃, which can lead to clot formation at the tip of the ablation electrode 100, which can lead to a sudden increase in impedance, a sudden decrease in current delivered to the tissue, and a significant decrease in tissue heating. In the invention, the preset value of the temperature difference between the temperature sensors 120 in the ablation electrode 100 can be set to be 10 ℃, and if the temperature value of the end surface temperature sensor 120 is higher than the temperature value of any side surface temperature sensor 120 by more than 10 ℃, the contact type is determined to be front contact; if the temperature of the end surface temperature sensor 120 is higher than the temperature of any side surface temperature sensor 120 by a value within 10 ℃, and the temperatures of the side surface temperature sensors 120 are not consistent, it is determined that the contact type is side surface contact.
According to some embodiments of the invention, the method of detecting the contact type of the radiofrequency ablation catheter 100 further comprises: by comparing the temperature values of the plurality of inner side surface temperature sensors 120, the orientation of the side surface contact of the radiofrequency ablation catheter 100 is judged.
According to some embodiments of the present invention, determining the orientation of the side contact of the rf ablation catheter 100 by comparing the temperature values of the plurality of side temperature sensors 120 comprises: the side surface temperature sensor 120 which compares and judges that the temperature values of the plurality of side surface temperature sensors 120 are the maximum; the radiofrequency ablation catheter 100 is determined to be facing the side where the lateral temperature sensor 120 with the largest temperature value is located.
The invention further provides a contact adjustment method of the radiofrequency ablation catheter 100, which is used for adjusting the contact of any one of the radiofrequency ablation catheters 100, and comprises the following steps: by comparing the temperature values of the end surface temperature sensor 120 and the side surface temperature sensor 120, the contact type of the radiofrequency ablation catheter 100 is judged to be front contact or side contact; when the contact type of the rf ablation catheter 100 is the side contact, the rf ablation catheter 100 is adjusted to the front contact by adjusting the pull wire 150 inside the body.
In the beginning stage of the ablation operation, high-energy and short-time ablation is performed, for example, about 3 seconds, the temperature of all parts of the ablation electrode 100 is stable and does not rise any more, and at this time, the contact angle between the catheter 100 and the endocardium can be identified through the temperature distribution. Then, the posture angle of the catheter 100 is adjusted, and the short-time high-energy ablation is repeated until the optimal forward direction angle is obtained, and then the long-time ablation is started, so that the ablation point treatment is completed.
According to the invention, the temperature sensor 120 group is arranged in the ablation electrode 100, the temperature distribution in the ablation electrode 100 is observed at the handle of the radiofrequency ablation catheter 100, the contact angle between the radiofrequency ablation catheter 100 and the inner wall of the heart is judged through the temperature distribution map, and the contact angle is fed back to an operator to adjust the posture of the catheter 100, so that the catheter 100 is in positive contact with the heart tissue. After positive contact, the proper ablation energy and ablation time of the radio frequency ablation instrument are determined, so that the operation safety can be improved, and scabbing and knocking caused by excessive ablation can be reduced.
While the invention has been described in connection with specific embodiments thereof, it is to be understood that it is intended by the appended drawings and description that the invention may be embodied in other specific forms without departing from the spirit or scope of the invention.
Claims (10)
1. A radio frequency ablation catheter, comprising:
a pipe body;
the ablation electrode is positioned at the end part of the tube body and is columnar;
the temperature sensor group comprises a plurality of temperature sensors arranged at different parts of the ablation electrode so as to detect the temperatures of the different parts of the ablation electrode;
the bottom surface of the free end of the ablation electrode is at least provided with an end surface temperature sensor, and the inner side surface of the ablation electrode is at least provided with two side surface temperature sensors at intervals.
2. The rf ablation catheter of claim 1, wherein the plurality of lateral temperature sensors disposed on the inner lateral surface of the ablation electrode are located on the same vertical cross-section of the ablation electrode.
3. The radiofrequency ablation catheter of claim 2, wherein the plurality of lateral temperature sensors on the inner lateral surface of the ablation electrode are arranged at equal intervals in the circumferential direction of the ablation electrode.
4. The rf ablation catheter of claim 1, wherein the ablation electrode is cylindrical, and the end surface temperature sensor located on the bottom surface of the free end of the ablation electrode is located at the center of the free end bottom surface.
5. The rf ablation catheter of claim 1, wherein a plurality of pull wires are disposed within the catheter body for adjusting the rf ablation catheter to bend in different directions.
6. A method for detecting the contact type of a radio frequency ablation catheter, which is used for detecting the contact type of the radio frequency ablation catheter according to any one of claims 1-5, and comprises the following steps:
acquiring temperature values detected by the end surface temperature sensor and the side surface temperature sensor;
and comparing the temperature values of the end surface temperature sensor and the side surface temperature sensor, and judging the contact type of the radiofrequency ablation catheter.
7. The method for detecting the contact type of the radiofrequency ablation catheter as recited in claim 6, wherein the contact type comprises: the forward contact and the lateral contact are performed, the temperature values of the end surface temperature sensor and the side surface temperature sensor are compared, and the contact type of the radiofrequency ablation catheter is judged, wherein the method comprises the following steps:
when the temperature values detected by the end surface temperature sensor and the side surface temperature sensor are stable in a preset range, if the temperature value of the end surface temperature sensor is higher than the temperature value of any one side surface temperature sensor by more than a preset value, judging that the contact type is front contact;
and if the temperature difference range of the temperature of the end surface temperature sensor, which is higher than the temperature of any side surface temperature sensor, is below a preset value and the temperatures of the side surface temperature sensors are not consistent, judging that the contact type is side surface contact.
8. The method for detecting the contact type of the radiofrequency ablation catheter as recited in claim 7, further comprising:
and judging the orientation of the side surface contact of the radiofrequency ablation catheter by comparing the temperature values of the plurality of inner side surface temperature sensors.
9. The method for detecting the contact type of the radiofrequency ablation catheter as recited in claim 8, wherein the determining the orientation of the lateral contact of the radiofrequency ablation catheter by comparing the temperature values of a plurality of the lateral temperature sensors comprises:
the side surface temperature sensors which compare and judge the temperature values of the plurality of side surface temperature sensors are the maximum;
and judging that the radio frequency ablation catheter is in side contact towards the side where the side temperature sensor with the largest temperature value is located.
10. A contact adjustment method of a radio frequency ablation catheter, wherein the adjustment method is used for adjusting the contact of the radio frequency ablation catheter according to any one of claims 1-5, and the method comprises the following steps:
judging whether the contact type of the radiofrequency ablation catheter is front contact or side contact by comparing the temperature values of the end surface temperature sensor and the side surface temperature sensor;
when the contact type of the radio frequency ablation catheter is side contact, the radio frequency ablation catheter is adjusted to be in front contact by adjusting the traction steel wire in the catheter body.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111429762.XA CN114145839A (en) | 2021-11-29 | 2021-11-29 | Radio frequency ablation catheter and posture detection and adjustment method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111429762.XA CN114145839A (en) | 2021-11-29 | 2021-11-29 | Radio frequency ablation catheter and posture detection and adjustment method thereof |
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| CN114145839A true CN114145839A (en) | 2022-03-08 |
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| CN202111429762.XA Pending CN114145839A (en) | 2021-11-29 | 2021-11-29 | Radio frequency ablation catheter and posture detection and adjustment method thereof |
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