CN102813552A - Fixing device for large-tip electrode in cold saline infusion ablation catheter - Google Patents

Abstract

The invention relates to a method for fixing a large head electrode in an electrophysiological catheter, in particular to a fixing device for a cold saline perfusion ablation catheter big head electrode. The device includes a perfusion bulk electrode, a perfusion tube, a mandrel and a temperature sensor; the perfusion bulk electrode is a stepped cylindrical chamber, including a first cylinder and a second cylinder, and the surface of the first cylinder is provided with a plurality of perfusion holes, The mandrel is pluggable and located in the perfusion hole; one end of the filling tube is covered with a fixing piece, and the end of the perfusion tube with the fixing piece is fixed into the inner cavity of the perfusion bulkhead electrode, and the end of the perfusion tube touches the highest point of the mandrel. point. The embodiment of the present invention effectively controls the perfusion tube to be located at the center of the inner cavity of the perfusion big head electrode, so that the perfusion hole can evenly spray out physiological saline, and at the same time ensures the wall-attachment performance between the temperature sensor and the inner wall of the big head electrode, and greatly improves the perfusion on the surface of the big head during surgery. The sameness and authenticity of the temperature at the site will give doctors a higher reference value when releasing radiofrequency ablation.

Description

A fixation device for bulk electrode of cold saline perfusion ablation catheter

technical field

The invention relates to a method for fixing a large-head electrode in an electrophysiological catheter, in particular to a fixing device for a large-head electrode of a cold saline perfusion ablation catheter for treating atrial fibrillation.

Background technique

Electrophysiological catheters are widely used in the field of interventional therapy for cardiac arrhythmias. The electrophysiological catheter is mainly punctured subcutaneously, and then sent to the corresponding heart through the human femoral vein or the superior and inferior vena cava. By using electrophysiological catheters with different functions, the intracardiac electrogram can be mapped, the lesion target can be found, and radiofrequency ablation can be performed. . The treatment of arrhythmia through radiofrequency catheter ablation can make the ablation electrode directly contact the lesion target. After the pain of postoperative recovery, the patient can get out of bed for free activities after minimally invasive interventional surgery. Radiofrequency ablation with electrophysiological catheters has attracted increasing attention in the field of interventional cardiology, and its unique minimally invasive therapy and remarkable therapeutic effects have been widely affirmed by the industry.

Cold saline infused ablation catheter for radiofrequency ablation of cardiac arrhythmias. After the lesion target is determined by electrophysiological catheter mapping, the radiofrequency ablation device releases radio frequency energy to the contact point between the head electrode of the catheter and the lesion point, and the abnormal myocardial cells are electrocuted to death by local heating of the lesion, blocking abnormal nerve conduction, and making the heart rhythm Returning to normal is the main working mechanism of radiofrequency ablation. In addition, a thermocouple or thermistor temperature sensor fixed inside the head electrode is used to monitor the ablation temperature to avoid excessive damage to cardiomyocytes and realize precise control of radiofrequency ablation time, temperature and power. The cold saline perfusion catheter is used to perfuse cold saline while performing radiofrequency ablation, which reduces the damage to the surrounding cardiomyocytes during radiofrequency ablation, and controls the damage of the rake point more accurately. The damage range is small but the depth is deeper and the effect is better. The use of cold saline perfusion ablation catheter for atrial fibrillation treatment is widely recognized by doctors in China.

The cold saline perfusion ablation catheter needs to perfuse physiological saline through a standard Luer interface at the proximal end of the catheter handle during use, and perfuse the head electrode. During ablation, saline flows through the catheter lumen and out the tip electrodes, perfusing and cooling the ablation site and the electrode tips. Whether the small hole on the perfusion bulk electrode can spray physiological saline evenly to make the tip electrode cool evenly so that the temperature of the bulk head reflected by the temperature sensor is true and accurate is crucial to the use of cold saline perfusion ablation catheter for radiofrequency ablation. Due to the small size of the perfusion bulk electrode, generally use 7F (2.33mm) and 7.5F (2.47mm) perfusion bulk electrodes. Electrode leads, stainless steel wires and stainless steel sheets are difficult to ensure that the perfusion catheter is in the middle of the inner cavity of the perfusion bulk electrode, so that it is difficult to ensure that the water column is evenly distributed when it is sprayed out through the small holes on the surface of the bulk electrode. Since the temperature sensor is in close contact with the bulk electrode, it is necessary to accurately reflect the temperature of the bulk electrode and provide data with reference value to the doctor when performing radiofrequency ablation. However, it is also difficult to fix the temperature sensor when fixing the perfusion tube in the prior art.

Contents of the invention

(1) Technical problems to be solved

The technical problem to be solved by the present invention is to provide a fixing device for the bulk electrode of the cold saline perfusion ablation catheter, so as to overcome the above-mentioned defects in the prior art.

(2) Technical solutions

In order to solve the above technical problems, the present invention provides a fixing device for cold saline perfusion ablation catheter bulk electrode, including: perfusion bulk electrode, perfusion tube, mandrel and temperature sensor;

The perfusion bulk electrode is a stepped cylindrical chamber, including a first cylinder and a second cylinder, the diameter of the first cylinder is greater than the diameter of the second cylinder, and the top surface of the first cylinder is convex arc;

The surface of the first cylinder is provided with a plurality of perfusion holes, and the mandrel is pluggably located in the perfusion holes;

One end of the pouring tube is covered with a fixing piece, and the end of the filling tube with the fixing piece touches the inner cavity of the filling bulk electrode;

The temperature sensor is arranged on one side of the perfusion tube and inserted into the cavity of the perfusion bulkhead electrode.

Further, the number of the perfusion holes is six, which are evenly distributed on the surface of the first cylinder.

Further, the diameter of the perfusion hole is between 0.3 mm and 0.7 mm.

Further, the diameter of the mandrel is between 0.1 mm and 0.6 mm.

Further, the fixing piece is in the shape of a tube made of polymer plastic material.

Further, the polymer plastic material is nylon 12 elastomer, polytetrafluoroethylene, nylon 12 or Teflon.

Further, the fixing member is fixed on the perfusion pipe through heat shrinkage, welding and bonding.

Further, the length of the fixing part is 1-3 mm, and its inner diameter is larger than the outer diameter of the perfusion tube, and the outer diameter of the position where the perfusion tube has the fixing part is equal to the diameter of the inner cavity of the perfusion bulk electrode.

Further, the fixing member is fixed at the far end of the perfusion tube, and the distance from the farthest end of the perfusion tube is less than 0.5mm.

Further, the bottom of the second cylinder in the perfusion bulk electrode is connected with stainless steel wire, stainless steel sheet and electrode wire.

(3) Beneficial effects

The embodiment of the present invention has the following advantages: through the above invention, the perfusion tube can be effectively controlled to be located at the center of the inner cavity of the perfusion bulk electrode, so that the perfusion hole in the perfusion bulk electrode can evenly spray out physiological saline, and at the same time, the temperature sensor and the inner wall of the bulk electrode can be ensured. The wall-attachment performance greatly improves the uniformity and authenticity of the temperature on the surface of the big head perfused during the operation, and has a higher reference value for the doctor in releasing radiofrequency ablation.

Description of drawings

Fig. 1 is a schematic structural diagram of a fixing device for a large head electrode of a cold saline perfusion ablation catheter according to an embodiment of the present invention;

Fig. 2 is a cross-sectional view of the structure of the fixing device for the bulk electrode of the cold saline perfusion ablation catheter according to the embodiment of the present invention;

Fig. 3 is a schematic diagram of the structure of the perfusion tube in the structure of the fixation device for the big head electrode of the cold saline perfusion ablation catheter according to the embodiment of the present invention.

Reference signs:

1: Infusion bulk electrode; 2: Fixing piece; 3: Infusion tube; 4: Temperature sensor; 5: Mandrel; 11 First cylinder; 12: Second cylinder.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

As the first technical solution of the present invention, the fixing device for the bulk electrode of the cold saline perfusion ablation catheter includes: perfusion bulk electrode, perfusion tube, mandrel and temperature sensor;

The perfusion bulk electrode is a stepped cylindrical chamber, including a first cylinder and a second cylinder, the diameter of the first cylinder is greater than the diameter of the second cylinder, and the top surface of the first cylinder is convex arc;

The surface of the first cylinder is provided with a plurality of perfusion holes, and the mandrel is pluggably located in the perfusion holes;

One end of the pouring tube is covered with a fixing piece, and the end of the filling tube with the fixing piece touches the inner cavity of the filling bulk electrode;

The temperature sensor is arranged on one side of the perfusion tube and inserted into the cavity of the perfusion bulkhead electrode.

As the second technical solution of the present invention, on the basis of the first technical solution, the number of the perfusion holes is six, which are evenly distributed on the surface of the first cylinder.

As the third technical solution of the present invention, on the basis of the second technical solution, the diameter of the perfusion hole is between 0.3 mm and 0.7 mm.

As the fourth technical solution of the present invention, on the basis of the first technical solution, the diameter of the mandrel is between 0.1 mm and 0.6 mm.

As the fifth technical solution of the present invention, on the basis of the first technical solution, the fixing member is tubular made of polymer plastic material.

As the sixth technical solution of the present invention, on the basis of the fifth technical solution, the polymer plastic material is nylon 12 elastomer, nylon 12 or Teflon.

As the seventh technical solution of the present invention, on the basis of the fifth technical solution, the fixing member is fixed on the perfusion pipe through heat shrinkage, welding and bonding.

As the eighth technical solution of the present invention, on the basis of the first technical solution, the length of the fixing member is 1-3mm, and its inner diameter is larger than the outer diameter of the perfusion tube, and the perfusion tube has a The outer diameter is equal to the lumen diameter of the perfusion bulkhead electrode.

As the ninth technical solution of the present invention, on the basis of the first technical solution, the fixing member is fixed at the far end of the perfusion tube, and the distance from the farthest end of the perfusion tube is less than 0.5mm.

As the tenth technical solution of the present invention, on the basis of the first technical solution, a temperature sensor is also included. The temperature sensor is arranged on one side of the perfusion tube and inserted into the cavity of the perfusion bulk electrode.

As shown in Figures 1-3, the fixing device for the bulk electrode of the cold saline perfusion ablation catheter according to the embodiment of the present invention includes: the perfusion bulk electrode 1, the perfusion tube 3, the mandrel 5 and the temperature sensor 4; the perfusion bulk electrode 1 is a step A cylindrical chamber, comprising a first cylinder 11 and a second cylinder 12, the diameter of the first cylinder 11 is greater than the diameter of the second cylinder 12, the top surface of the first cylinder 11 is outward Raised arc surface; the surface of the first cylinder 11 is uniformly provided with six filling holes 13, and the mandrel 5 is pluggably located in the filling holes 13; one end of the filling pipe 3 is provided with a fixing part 2, and the filling One end of the tube 3 with the fixing part 2 abuts into the cavity of the perfusion bulk electrode 1 . The temperature sensor 4 is arranged on one side of the perfusion tube 3 and inserted into the cavity of the perfusion bulk electrode 1 .

Wherein, the aperture of the perfusion hole is between 0.3 mm and 0.7 mm, and the perfusion bulkhead electrode 1 is fixed by the mandrel 5, and the diameter of the mandrel is between 0.1 mm and 0.6 mm. Typically three mandrels are used to pass through the six irrigation holes 13 .

Wherein, the fixing part 2 is made of polymer plastic material, wherein the polymer plastic material is nylon 12 elastomer, nylon 12 or Teflon. It is preferable that the fastener adopts polytetrafluoroethylene heat-shrinkable tubing. The fixing part 2 is fixed on the perfusion pipe 3 by means of heat shrinkage, welding and bonding. The length of the fixture is 1-3mm, its inner diameter is larger than the outer diameter of the perfusion tube 3 and closely fits with the perfusion tube 3, and the outer diameter of the perfusion tube 3 with the fixture 2 is equal to the inner cavity diameter of the perfusion bulk electrode 1. The fixing part 2 is fixed at the far end of the perfusion tube 3 and is less than 0.5mm away from the farthest end of the perfusion tube 3 .

The following is a detailed description of the fixing method of the bulk electrode of the cold saline perfusion ablation catheter:

First, use mandrels 5 with a diameter of 0.4 mm, and use three mandrels 5 to pass through the six perfusion holes 13 on the surface of the bulk electrode 1 as shown in FIG. 1 . Next, as shown in Figure 3, set the fixing part 2 on the perfusion tube 3. The fixing part 2 is a polytetrafluoroethylene heat-shrinkable tube with an inner diameter of 0.88mm, (the outer diameter of the perfusion tube is 0.86mm) and a length of 1mm. After putting the fixing part 2 on the perfusion tube 3, place the distal end of the fixing part 2 at 0.2 mm from the farthest end of the perfusion tube, clamp it with tweezers, then heat shrink the part where the fixing part 2 is covered, and fix it on the perfusion tube 3 , the outer diameter here is 1.32 mm after heat shrinkage, when the perfusion tube 3 covered with the fixing part 2 is put into the cavity of the perfusion bulkhead electrode 1, the perfusion tube 3 just touches the highest point of the mandrel 5. Then put a temperature sensor 4 with an outer diameter of 0.23 mm into the inner cavity of the perfusion bulkhead electrode 1 along one side of the perfusion tube 3 , and the head of the temperature sensor 4 pushes against the proximal end of the perfusion tube fixture 2 .

Put the perfusion bulk electrode 1 upside down (the farthest end of the perfusion bulk electrode faces down), and use medical grade glue such as UV curing glue to inject glue along the cavity wall of the perfusion bulk electrode 1 so that the temperature sensor 4 and the perfusion tube 3 are relative to the perfusion bulk electrode no exercise. Wait for the glue on the first point to solidify and then pour glue into the inner cavity of the filling bulk electrode 3, the uppermost line of the glue is lower than the 1mm of the proximal edge of the filling bulk electrode 1.

After the glue is cured, the erection of the big head electrode 1 will be poured, and the mandrel 5 will be rotated slowly, and the mandrel 5 will be taken out.

Then use brazing to weld stainless steel wire, stainless steel sheet and electrode wire at the proximal end of the perfusion bulk electrode 0.8-1.5mm.

Through the above invention, the perfusion tube can be effectively controlled to be located at the center of the inner cavity of the perfusion bulk electrode, so that the perfusion hole in the perfusion bulk electrode can evenly spray out physiological saline, and at the same time, the adhesion performance between the temperature sensor and the inner wall of the bulk electrode is ensured, which greatly improves the The uniformity and authenticity of the temperature on the surface of the big head perfused during the operation will give doctors a higher reference value when releasing radiofrequency ablation.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and replacements can also be made, these improvements and replacements It should also be regarded as the protection scope of the present invention.

Claims (10)

1. the fixture of the big tip electrode of cool brine open irrigated ablation catheters is characterized in that, comprising: pour into big tip electrode, intrusion pipe, mandrel and temperature sensor;

The big tip electrode of said perfusion is stepped cylindrical chamber, comprises first cylinder and second cylinder, and the said first cylindrical diameter is greater than the second cylindrical diameter, and the said first cylindrical end face is the cambered surface to outer lug;

The said first cylindrical surface is provided with a plurality of fill orifices, the pluggable fill orifice that is arranged in of said mandrel;

A said jar of end of annotating pipe is with fixture, and the end that said intrusion pipe has fixture fixedly supports in the big tip electrode inner chamber of perfusion, and the end of said intrusion pipe touches the peak of mandrel;

A side of intrusion pipe is located in said temperature sensor, and inserts in the big tip electrode inner chamber of perfusion.

2. the fixture of the big tip electrode of cool brine open irrigated ablation catheters as claimed in claim 1 is characterized in that the quantity of said fill orifice is six, and it is evenly distributed on the first cylindrical surface.

3. the fixture of the big tip electrode of cool brine open irrigated ablation catheters as claimed in claim 2 is characterized in that the aperture of said fill orifice is between 0.3mm～0.7mm.

4. the fixture of the big tip electrode of cool brine open irrigated ablation catheters as claimed in claim 1 is characterized in that the diameter of said mandrel is between 0.1mm～0.6mm.

5. the fixture of the big tip electrode of cool brine open irrigated ablation catheters as claimed in claim 1 is characterized in that said fixture is the tubulose that high molecule plastic is processed.

6. the fixture of the big tip electrode of cool brine open irrigated ablation catheters as claimed in claim 5 is characterized in that, said high molecule plastic material is nylon 12 elastomers, politef, nylon 12 or Teflon.

7. the fixture of the big tip electrode of cool brine open irrigated ablation catheters as claimed in claim 5 is characterized in that said fixture is fixed on the intrusion pipe through pyrocondensation, welding and bonding mode.

8. the fixture of the big tip electrode of cool brine open irrigated ablation catheters as claimed in claim 1; It is characterized in that; The length of said fixture is 1-3mm, and its internal diameter is greater than the external diameter of intrusion pipe, and the external diameter that said intrusion pipe has the fixture position equals to pour into big tip electrode intracavity diameter.

9. the fixture of the big tip electrode of cool brine open irrigated ablation catheters as claimed in claim 1 is characterized in that fixture is fixed on the far-end of intrusion pipe, apart from the distal-most end of intrusion pipe less than 0.5mm.

10. the fixture of the big tip electrode of cool brine open irrigated ablation catheters as claimed in claim 1 is characterized in that, second cylinder bottom connects stainless steel silk, stainless steel substrates and electrode cable in the big tip electrode of said perfusion.

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