CN215425058U

CN215425058U - Radio frequency ablation probe

Info

Publication number: CN215425058U
Application number: CN202122215872.8U
Authority: CN
Inventors: 庄世虹
Original assignee: Nanjing First Hospital
Current assignee: Nanjing First Hospital
Priority date: 2021-09-13
Filing date: 2021-09-13
Publication date: 2022-01-07
Anticipated expiration: 2031-09-13

Abstract

The utility model provides a radio frequency ablation probe which can reduce the treatment operation difficulty and improve the safety and reliability of multi-point radio frequency ablation treatment. The air bag type air bag comprises a keel, wherein an air passage is arranged in the keel, the annular air bag surrounds the keel, and an air port formed in the keel is used for communicating the air passage with the interior of the annular air bag; the upper ends of a plurality of supports uniformly distributed on the periphery of the annular air bag are connected with the upper part of the keel, the lower ends of the supports are connected with movable bolts which are sleeved on the keel and can slide along the axial direction of the keel, the supports are made of memory polymer materials, and are in a linear shape in a normal state, and the annular air bag which is not inflated is pressed on the periphery of the keel; when the annular air bag is inflated through the air passage, the linear support is supported by the expansion of the annular air bag to form an arc shape; an electrode is arranged in the middle of the outer side of the support, a heat sensor is further arranged on the support, the electrode and the heat sensor are communicated with a lead, and the lead penetrates through a lead groove formed in the support, the movable bolt and the keel and extends out of the keel.

Description

Radio frequency ablation probe

Technical Field

The utility model relates to a radio frequency ablation probe in a medical instrument, in particular to a radio frequency ablation probe which can be applied to tissues such as pulmonary veins, esophagus and the like.

Background

Radio frequency ablation is a traditional interventional therapy technology, most of the current radio frequency therapy is single-point ablation, and the effect of the multipoint ablation is poor due to the problems of focus positioning and tissue contact, so that the improvement is needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a radio frequency ablation probe which can reduce the treatment operation difficulty and improve the safety and reliability of multi-point radio frequency ablation treatment.

A radio frequency ablation probe comprises a keel, wherein an air passage is arranged in the keel, an annular air bag surrounds the keel, and an air port formed in the keel is used for communicating the air passage with the interior of the annular air bag; the upper ends of a plurality of supports uniformly distributed on the periphery of the annular air bag are connected with the upper part of the keel, the lower ends of the supports are connected with movable bolts which are sleeved on the keel and can slide along the axial direction of the keel, the supports are made of memory polymer materials, and are in a linear shape in a normal state, and the annular air bag which is not inflated is pressed on the periphery of the keel; when the annular air bag is inflated through the air passage, the linear support is supported by the expansion of the annular air bag to form an arc shape; an electrode is arranged in the middle of the outer side of the support, a heat sensor is further arranged on the support, the electrode and the heat sensor are communicated with a lead, and the lead penetrates through a lead groove formed in the support, the movable bolt and the keel and extends out of the keel.

The radio frequency ablation probe is characterized in that a cold saline filling pipe is arranged in the keel, the upper end of the cold saline filling pipe is communicated with a check valve positioned at the upper part of the keel, and an outlet of the check valve is arranged at the upper end of the keel.

The periphery of the keel opposite to the linear bracket of the radio frequency ablation probe is provided with a groove for accommodating the annular air bag.

According to the radio frequency ablation probe, the limit ring used for limiting the movable bolt to slide upwards to exceed the limit position is arranged on the keel.

The utility model has the beneficial effects that:

during the use, this radio frequency ablation probe stretches out treatment pipe and stretches into the intravenous back, inflates annular gasbag through the air flue, and annular gasbag collides gradually, props up the support, and the activity is tied and is upwards moved along fossil fragments simultaneously, and the support changes gradually into the arc, and a plurality of electrodes at a plurality of support middle parts contact with the focus gradually, and when electrode and focus tissue fully contacted, the stop is aerifyd, and the accessible wire is switched on to the electrode, implements the radio frequency treatment.

During the treatment process, if the temperature detected by the heat sensor is higher than the set threshold, the radio frequency energy output should be suspended, and even cold saline can be injected through the cold saline injection pipe and the check valve to carry out local cooling.

After the treatment is finished, the gas in the annular air bag is released, at the moment, the memory of the arc-shaped support restores to be linear, the annular air bag is pressed back into the annular groove on the periphery of the keel, and then the radio frequency ablation probe is withdrawn into the treatment catheter and the treatment catheter is withdrawn.

The radio frequency ablation probe can implement multi-point radio frequency ablation treatment, and improves the safety and reliability of the multi-point radio frequency ablation treatment; meanwhile, the use is convenient, and the treatment operation difficulty is reduced.

When the radio frequency ablation probe is used, the radio frequency ablation probe is arranged at the front end of the treatment catheter and can be connected with a far-end radio frequency therapeutic apparatus, a safety gas charging and sucking device and a cold saline water perfusion device. The electrode can be ensured to be safely and effectively contacted with lesion tissues through air pressure monitoring, and the electrode is mainly suitable for radio frequency ablation treatment of tissues such as the pulmonary vein and the esophagus.

The keel material is toughness macromolecular material, and the head end is the cambered surface structure, contains air flue, cold salt water perfusion tube, metallic channel in the inside. The periphery is provided with a limiting ring for limiting the axial position of the movable bolt in the maximum radian state of the bracket.

The support material is high temperature resistant memory macromolecular material, and the support upper end is connected in fossil fragments upper portion, and the end connection is on the activity is tied. The radiofrequency ablation electrode is embedded in the middle of the support, the heat sensor is arranged in the support on the upper part of the electrode, and a lead electrically connected with the radiofrequency ablation electrode and the heat sensor penetrates through the inside of the support, the movable bolt and a lead groove on the keel to be connected with the far end.

The annular air bag is made of elastic high polymer materials, is contained in an annular groove on the periphery of the keel under the pressure of the six supports when not inflated, and is bent after being inflated and expanded. And stopping inflating when the air pressure of the remote monitoring annular air bag reaches a threshold value.

The annular air bag is communicated with the air passage through a pair of air ports which are axially symmetrical on the keel, and air is inflated and sucked into the annular air bag through the air ports through the air passage.

The movable bolt can move on the movable track in the middle of the keel to adapt to the bending of the bracket.

The front end of the cold saline perfusion tube in the keel bracket is provided with a check valve to prevent blood from flowing backwards or foreign matters from running backwards.

Drawings

FIG. 1 is an axial sectional view of a radio frequency ablation probe (with the annular balloon in an inflated state);

FIG. 2 is a cross-sectional view of the RF ablation probe (with the annular balloon inflated);

FIG. 3 is an axial sectional view of the RF ablation probe (with the annular balloon in a contracted state);

FIG. 4 is a perspective view of the RF ablation probe (balloon inflated);

FIG. 5 is another perspective view of the RF ablation probe (balloon inflated state);

fig. 6 is a system schematic of the radio frequency ablation probe in use.

In the figure, a keel 1, a cold saline infusion port 2, an annular air bag 3, a movable bolt 4, a wire guide groove 5, an air passage 6, a cold saline infusion pipe 7, a check valve 8, a bracket 9, a heat sensor 10, a hot electrode (radio frequency ablation electrode) 11, an air port 12 and a limiting ring 13.

Detailed Description

The radiofrequency ablation probe shown in fig. 1-5 comprises a keel, wherein an annular air passage is arranged in the keel, an annular air bag surrounds the keel, and two air ports which are axially symmetrical on the keel are arranged on the keel and are used for communicating the air passage with the interior of the annular air bag; the upper ends of a plurality of supports uniformly distributed on the periphery of the annular air bag are connected with the upper part of the keel, and the lower ends of the supports are sleeved on the keel and can be connected with the movable bolt capable of sliding along the axial direction of the keel.

The bracket is made of memory polymer material, which is in a straight line shape in a normal state and presses the uninflated annular air bag on the groove at the periphery of the keel; when the annular air bag is inflated through the air passage, the linear support is supported by the expansion of the annular air bag to form an arc shape; an electrode is arranged in the middle of the outer side of the support, a heat sensor is further arranged on the support, the electrode and the heat sensor are communicated with a lead, and the lead penetrates through a lead groove formed in the support, the movable bolt and the keel and extends out of the keel.

The keel is internally provided with a cold saline filling pipe, the upper end of the cold saline filling pipe is communicated with a check valve positioned at the upper part of the keel, and the outlet of the check valve is communicated with a cold saline filling opening at the periphery of the front end of the keel.

And a limiting ring for limiting the upward sliding of the movable bolt beyond the limit position is arranged on the keel.

The specific process is as follows in combination with atrial fibrillation radio frequency ablation treatment:

the treatment catheter is punctured into the femoral vein of the patient, passes through the inferior vena cava to reach the right atrium, and is punctured into the left atrium at the interatrial septum. To create a separation between the pulmonary veins and the atria, radiofrequency thermal ablation of the circum-pulmonary vein myocardium is required to block the transmission of electrical signals from the pulmonary veins to the atria.

Referring to fig. 6, the rf ablation probe in the catheter is extended out of the catheter, the rf ablation probe is extended into the pulmonary vein ring with the assistance of the X-ray angiography instrument, and the annular balloon is inflated through the airway at this time, and when the pressure data monitored by the pressure controller in this process is equal to the preset pressure threshold (when the electrode is in full contact with the tissue), rf therapy can be performed.

During the treatment process, if the temperature monitored by the heat sensor is higher than a set threshold value, the radio frequency energy output is suspended, cold saline is injected to a cold saline injection port at the front end of the keel through the cold saline injection pipe and the check valve, and the electrode, the focus and the like are locally cooled.

After the treatment is finished, the air in the annular air bag is released through the air pressure controller, at the moment, the memory of the arc-shaped support restores the linear shape, the annular air bag is pressed back into the annular groove on the periphery of the keel, and then the radio frequency ablation probe is withdrawn into the catheter and the treatment catheter is withdrawn.

Claims

1. A radio frequency ablation probe comprises a keel and is characterized in that: an air passage is arranged in the keel, the annular air bag surrounds the keel, and an air port formed in the keel is used for communicating the air passage with the interior of the annular air bag; the upper ends of a plurality of supports uniformly distributed on the periphery of the annular air bag are connected with the upper part of the keel, the lower ends of the supports are connected with movable bolts which are sleeved on the keel and can slide along the axial direction of the keel, the supports are made of memory polymer materials, and are in a linear shape in a normal state, and the annular air bag which is not inflated is pressed on the periphery of the keel; when the annular air bag is inflated through the air passage, the linear support is supported by the expansion of the annular air bag to form an arc shape; an electrode is arranged in the middle of the outer side of the support, a heat sensor is further arranged on the support, the electrode and the heat sensor are communicated with a lead, and the lead penetrates through a lead groove formed in the support, the movable bolt and the keel and extends out of the keel.

2. The radio frequency ablation probe of claim 1, wherein: the keel is internally provided with a cold saline filling pipe, the upper end of the cold saline filling pipe is communicated with a check valve positioned at the upper part of the keel, and the outlet of the check valve is arranged at the upper end of the keel.

3. The radio frequency ablation probe of claim 1, wherein: the keel periphery opposite the linear stent has a groove for receiving the annular bladder.

4. The radio frequency ablation probe of claim 1, wherein: and a limiting ring for limiting the upward sliding of the movable bolt beyond the limit position is arranged on the keel.

5. The radio frequency ablation probe of claim 1, wherein: two air ports axially symmetrical with the keel are formed in the keel.