CN203089370U - Multipoint radio frequency ablation electrode for renal sympathetic nerve removing surgery - Google Patents

Abstract

The utility model provides a multipoint radio frequency ablation electrode for a renal sympathetic nerve removing surgery. The multipoint radio frequency ablation electrode comprises an annular tube, an inner tube and a hand shank. The annular tube is arranged on the inner tube in a sleeved mode, and the hand shank is connected with the tail portion of the inner tube. The inner tube comprises head electrodes, an inner tube protective tube and an inner tube framework. The number of the head electrodes is N, wherein the N is larger than or equal to 2. Each head electrode comprises an ablation electrode, a head electrode protective tube and a head electrode elastic framework. One-time intervention can be achieved due to the fact that a plurality of head electrodes are arranged, the purpose of simultaneous or point-to-point ablation is achieved, surgical time and X-ray exposure time can be shortened, and surgical safety is further improved. The head electrodes are arranged in a staggered mode and then are distributed in a spiral mode, the ablation cover area of the head electrodes along the axial direction is enlarged, and ablation efficiency is improved. The effects that the head electrodes stretch out of a guiding hole formed in the annular tube and retract from the guiding hole in the annular tube are achieved through the relative movement of the inner tube and the annular tube. The head electrodes can reach an adherent wall and can adjust the strength of the adherent wall when the head electrodes stretch out of the guiding hole, and the head electrodes can be pulled out timely when the head electrodes retract.

Description

A multi-point radiofrequency ablation electrode for renal sympathetic denervation

technical field

The utility model relates to the field of active medical devices, in particular to a multi-point radio frequency ablation electrode for renal sympathetic nerve surgery.

Background technique

With the improvement of material living standards, diseases that endanger human life and life emerge in an endless stream. In this era of extremely fast pace of life, the number of hypertensive patients is increasing year by year, and the rate of increase is very fast. Hypertension is defined as elevated arterial systolic and/or diastolic blood pressure at rest. Hypertension is a systemic disease characterized by elevated arterial pressure, which may be accompanied by functional or organic changes in the heart, blood vessels, brain, and kidneys. Refractory hypertension (or hypertension) is called refractory hypertension when the systolic and diastolic blood pressure cannot be controlled at the target level despite the measures of improving lifestyle and a reasonable combination of at least three antihypertensive drugs including diuretics. resistant hypertension). It has been clinically proven that these patients suffering from intractable hypertension cannot be well controlled by drugs.

It has been found through research that the overactivity of sympathetic nerves on the renal arteries is an important factor causing high blood pressure, and a large number of animal experiments have confirmed the influence of the sympathetic nervous system on blood pressure. Clinical studies have also found that the degree of sympathetic nerve excitement is positively correlated with the patient's blood pressure level. Sympathectomy was considered a treatment for high blood pressure long before the advent of modern drug therapy. In this way, the purpose of controlling blood pressure can be achieved by blocking part of the renal artery sympathetic nerve. Although a satisfactory effect has been achieved in reducing the blood pressure of patients, long-term follow-up has not found that simple sympathetic ganglionectomy has high mortality and postoperative morbidity, and is accompanied by serious long-term complications, and even serious complications. Orthostatic hypotension.

At present, the clinically used electrode catheter has only one electrode, and the doctor must perform the operation on the next point after completing the ablation of one point. There are 8 to 12 operations, the X-ray exposure time is very long, and the operation time is long, and the risk is relatively high.

Utility model content

(1) Technical problems to be solved

The technical problem to be solved by the utility model is to improve the ablation efficiency, shorten the operation time, reduce the risk of operation and the side effects brought to patients in the process of renal sympathetic denervation in view of the above defects.

(2) Technical solutions

In order to solve the above problems, the utility model provides a multi-point radio frequency ablation electrode method for renal sympathetic nerve surgery. The multi-point radio frequency ablation electrode for renal sympathetic nerve surgery specifically includes:

A sleeve 1, an inner tube 7 and a handle 5, the sleeve 1 is set on the inner tube 7, and the handle 5 is connected to the tail of the inner tube 7;

The inner tube 7 includes a head electrode 2, an inner tube protection tube 3, and an inner tube skeleton 4, wherein the number of the head electrodes 2 is N, and N≥2;

The head electrode 2 includes an ablation electrode 21 , a head electrode protection tube 22 and a head electrode elastic skeleton 23 .

Preferably, the N head electrodes 2 are axially staggered along the inner tube 7 and distributed in a spiral shape.

Preferably, the head of the ablation electrode 21 is arc-shaped, and a cavity is formed inside, and the tail of the ablation electrode 21 is bonded inside the front end of the head electrode protection tube 22 .

Preferably, the head electrode protection tube 22 is sleeved on the head electrode elastic framework 23 .

Preferably, the front end of the head electrode elastic skeleton 23 is connected to the tail of the ablation electrode 21 , and the rear end is fixedly connected to the inner tube skeleton 4 .

Preferably, the head electrode 2 further includes a temperature sensor 24 fixedly connected in the cavity of the ablation electrode 21 .

Preferably, when the inner tube 7 moves forward relative to the sleeve 1, the head electrode 2 protrudes out of the sleeve 1; the inner tube 7 moves backward relative to the sleeve 1 , the head electrode 2 shrinks into the sleeve 1 .

Preferably, the N head electrodes 2 are respectively embedded in the guide holes 6 of the sleeve 1 .

Preferably, the number of the guide holes 6 is the same as the number of the head electrodes 2, the guide holes 6 are arranged axially staggered along the casing 1, and the distribution positions are respectively the same as those of the head electrodes 2. Corresponding to the distribution position, it is also distributed in a spiral shape.

Preferably, the guide hole 6 extends toward the inside of the casing 1 .

(3) Beneficial effects

The utility model proposes a multi-point radio frequency ablation electrode for renal sympathetic nerve surgery, which can be intervened at one time by setting multiple head electrodes to achieve the purpose of simultaneous or point-by-point ablation, thereby shortening the operation time and X-ray exposure time, and ensuring safe operation Sex is also further improved. A plurality of head electrodes are arranged in a staggered manner and distributed in a spiral shape, so that the ablation coverage area along the axial direction is enlarged, and the ablation efficiency is improved. The relative movement of the inner tube and the cannula realizes the effect that the head electrode protrudes and shrinks from the guide hole on the cannula, so that when the head electrode is stretched out, it can achieve the effect of sticking to the wall and adjusting the strength of the wall, and when the head electrode shrinks, it can realize timely withdrawal.

Description of drawings

Fig. 1 is a structural schematic diagram of a multi-point radiofrequency ablation electrode for renal sympathetic nerve removal according to the present invention;

Fig. 2 is a partially enlarged schematic diagram of the head electrode in a multi-point radiofrequency ablation electrode for renal sympathetic nerve surgery of the present invention;

3 is a schematic diagram of a multi-point radio frequency ablation electrode for renal sympathetic nerve surgery in the working state of the utility model;

FIG. 4 is a schematic diagram of the position of the head electrode and the guide hole in a multi-point radiofrequency ablation electrode for renal sympathetic nerve removal according to the present invention.

Among them: 1. Sleeve, 2. Head electrode, 3. Inner tube protection tube, 4. Inner tube skeleton, 5. Handle, 6. Guide hole, 7. Inner tube, 21. Ablation electrode, 22. Head electrode protection tube , 23, the elastic skeleton of the head electrode, 24, the temperature sensor.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the specific embodiment of the utility model is described in further detail. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

An embodiment of the present invention provides a multi-point radiofrequency ablation electrode for renal sympathetic nerve surgery, and its structural diagram is shown in Figure 1, specifically including:

The sleeve pipe 1, the inner pipe 7 and the handle 5, the sleeve pipe 1 is set on the inner pipe 7, and the handle 5 is connected with the tail of the inner pipe 7.

Wherein, the inner tube 7 includes a head electrode 2, an inner tube protection tube 3, and an inner tube skeleton 4, and the number of the head electrodes 2 is N, and N≥2. In this embodiment, N=4 is used for renal sympathetic denervation. Multi-point radiofrequency ablation electrodes are described.

A schematic diagram of a partial method of the head electrode 2 is shown in FIG. 2 . The head electrode 2 includes an ablation electrode 21 , a head electrode protection tube 22 and a head electrode elastic skeleton 23 .

The ablation electrode 21 is preferably made of very high-purity platinum material, and its head is arc-shaped, which has achieved the effect of protecting the vascular intima. A cavity is formed inside the ablation electrode 21 , and the tail of the ablation electrode 21 is bonded inside the front end of the head electrode protection tube 22 .

The head electrode protective tube 22 is sleeved on the head electrode elastic frame 23 to protect the head electrode elastic frame 23 . The elastic skeleton 23 of the head electrode is preferably made of nickel-titanium alloy, because the nickel-titanium alloy has very good elasticity and biocompatibility, and a layer of the head electrode protective tube 22 is wrapped around the nickel-titanium alloy.

The front end of the head electrode elastic frame 23 is connected to the tail of the ablation electrode 21 , and the rear end is fixedly connected to the inner tube frame 4 . The inner tube protection tube 3 is fitted on the inner tube frame 4 to achieve the purpose of protecting the inner tube frame. The inner tube protection tube 3 is preferably made of a very biocompatible plastic material. The inner tube skeleton 4 is preferably made of medical stainless steel tube to achieve the purpose of elasticity and supporting force. The head electrode 2 , the inner tube skeleton 4 and the inner tube protection tube 3 form an integral inner tube 7 .

The head electrode 2 also includes a temperature sensor 24, the temperature sensor 24 is fixed in the cavity of the ablation electrode 21, and the wires of the ablation electrode 21 are also welded on its inner wall, and the wires of the ablation electrode 21 and the temperature sensor 24 pass through the elastic skeleton 23 and the gap between the head electrode protection tube 22 is connected to the afterbody of the handle 5, and is drawn out by the handle 5.

The bushing 1 is set on the inner tube 7, and there is a gap between the inner tube 7 and the bushing 1, and relative movement is possible, as shown in FIG. 3 . When the inner tube 7 moves forward relative to the sleeve 1 , the head electrode 2 extends out of the sleeve 1 ; when the inner tube 7 moves backward relative to the sleeve 1 , the head electrode 2 shrinks into the sleeve 1 .

The casing 1 is a through pipe with four guide holes 6 , and the schematic diagram of the guide holes 6 is shown in FIG. 4 . The four head electrodes 2 are respectively embedded in the guide holes 6 of the sleeve 1, and the guide holes 6 are staggered along the axial direction of the sleeve 1, and the distribution positions correspond to the distribution positions of the head electrodes 2, and are also distributed in a spiral shape. The contact point between the head electrode 2 and the blood vessel wall is neither in the same longitudinal plane nor in the same transverse plane, so that the ablation coverage area along the axial direction is enlarged and the ablation efficiency is improved.

The guide hole 6 is preferably made of a soft material with good biocompatibility. The guide hole 6 extends to the inside of the casing 1 to guide the head electrode 2 .

In summary, using the multi-point radiofrequency ablation electrode for renal sympathetic denervation in the above embodiment, the alternating current is conducted to the renal artery tissue through the electrode at the tip of the catheter, so that it generates heat and raises the temperature (generally up to about 65°C), the sympathetic nerves in the upper part of the renal arteries lose their activity at high temperature, and achieve the purpose of blocking part of the sympathetic nerves in the renal arteries. Setting multiple head electrodes can intervene at one time to achieve the purpose of simultaneous or point-by-point ablation, thereby shortening the operation time and X-ray exposure time, and further improving the safety of the operation. The relative movement of the inner tube and the cannula realizes the effect that the head electrode protrudes and shrinks from the guide hole on the cannula, so that when the head electrode is stretched out, it can achieve the effect of sticking to the wall and adjusting the strength of the wall, and when the head electrode shrinks, it can realize timely withdrawal. Multiple head electrodes are arranged in a staggered manner and distributed in a spiral shape to expand the ablation coverage area along the axial direction and improve the efficiency of ablation, thereby effectively controlling blood pressure and enabling patients whose blood pressure cannot be controlled by common drugs to regain a healthy physique.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit the present utility model. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that without Under the situation of departing from the spirit and scope of the present utility model, various changes and modifications can also be made, so all equivalent technical solutions also belong to the category of the present utility model, and the patent protection scope of the utility model should be limited by the claims.

Claims (10)

1. one kind is removed kidney sympathetic nerve art multiple spot radio-frequency ablation electrode, it is characterized in that, described multiple spot radio-frequency ablation electrode comprises: sleeve pipe (1), interior pipe (7) and handle (5), described sleeve pipe (1) is sleeved on the described interior pipe (7), and described handle (5) is connected with the afterbody of described interior pipe (7);

Described in the pipe (7) comprise tip electrode (2), in manage and protect (3), interior cannon born frame (4), the number of wherein said tip electrode (2) is N, and N 〉=2;

Described tip electrode (2) comprises ablating electrode (21), tip electrode pillar (22) and tip electrode elastic skeleton (23).

2. the kidney sympathetic nerve art multiple spot radio-frequency ablation electrode that goes as claimed in claim 1 is characterized in that, a described N tip electrode (2) axially staggers along described interior pipe (7) and arranges, and shape distributes in the shape of a spiral.

3. the kidney sympathetic nerve art multiple spot radio-frequency ablation electrode that goes as claimed in claim 1, it is characterized in that, the head of described ablating electrode (21) is circular-arc, the inner cavity that forms, and the afterbody of described ablating electrode (21) is bonded in the front end inside of tip electrode pillar (22).

4. the kidney sympathetic nerve art multiple spot radio-frequency ablation electrode that goes as claimed in claim 1 is characterized in that described tip electrode pillar (22) is sleeved on the described tip electrode elastic skeleton (23).

5. the kidney sympathetic nerve art multiple spot radio-frequency ablation electrode that goes as claimed in claim 1 is characterized in that the front end of described tip electrode elastic skeleton (23) is connected the afterbody of described ablating electrode (21), fixedlys connected with described interior cannon born frame (4) in the rear end.

6. the kidney sympathetic nerve art multiple spot radio-frequency ablation electrode that goes as claimed in claim 1 is characterized in that described tip electrode (2) also comprises temperature sensor (24), and described temperature sensor (24) is fixed in the cavity of described ablating electrode (21).

7. the kidney sympathetic nerve art multiple spot radio-frequency ablation electrode that goes as claimed in claim 1 is characterized in that, when travelling forward, described tip electrode (2) reaches outside the described sleeve pipe (1) described interior pipe (7) with respect to described sleeve pipe (1); When moving backward, described tip electrode (2) is retracted in the described sleeve pipe (1) pipe (7) with respect to described sleeve pipe (1) in described.

8. the kidney sympathetic nerve art multiple spot radio-frequency ablation electrode that goes as claimed in claim 1 is characterized in that a described N tip electrode (2) is embedded into respectively in the pilot hole (6) of described sleeve pipe (1).

9. the kidney sympathetic nerve art multiple spot radio-frequency ablation electrode that goes as claimed in claim 8, it is characterized in that, the number of described pilot hole (6) is identical with the number of described tip electrode (2), described pilot hole (6) axially staggers along described sleeve pipe (1) and arranges, and distributing position is corresponding with the distributing position of described tip electrode (2) respectively, and also shape distributes in the shape of a spiral.

10. the kidney sympathetic nerve art multiple spot radio-frequency ablation electrode that goes as claimed in claim 8 is characterized in that, described pilot hole (6) extends to the inside of described sleeve pipe (1).

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