CN205041521U - Medical catheter head end of measurable contact force - Google Patents

Abstract

The utility model provides a medical catheter head end capable of measuring contact force, including a head end electrode, a force-measuring module and a fixing part, and the head-end electrode and the force-measuring module are fixed together through the fixing part; The force-measuring module includes a slider main body, a rigid beam and a support fixed on the rigid beam; the slider main body is provided with several protruding slider components; the rigid beam is provided with an axially penetrating inner cavity ; Several sliding resistors are set on the support; each of the slider components corresponds to the sliding resistors one by one through the resistance detection head installed at the end of the component. In the radiofrequency ablation operation, the medical catheter tip described in the utility model judges the ablation depth by measuring the pressure of the heart or arterial tissue rich in sympathetic nerves that the catheter tip contacts, and provides reliable contact force data support for doctors. It is for doctors to choose reasonable ablation power and time to ensure that the safety of radiofrequency ablation surgery is improved within a safe value range.

Description

A medical catheter tip with measurable contact force

technical field

The utility model relates to the technical field of medical instruments, in particular to a medical catheter head end with measurable contact force.

Background technique

In medical interventional operations, radiofrequency ablation catheters are widely used in the treatment of atrial fibrillation, arrhythmia, refractory hypertension and other diseases. The method of using the catheter is to insert the radiofrequency ablation catheter through the blood vessel into the heart or an artery rich in sympathetic nerves by puncturing the femoral artery or the radial artery with the assistance of an X-ray machine, and perform radiofrequency ablation of the lesion.

Obviously, this kind of radiofrequency ablation is performed manually by experienced doctors, but because it is difficult for human hands to accurately control the force of the catheter tip against human tissue, complications such as perforation and edema often occur during radiofrequency ablation occur.

Therefore, there is an urgent need in the market for a medical catheter that can reduce the complications of perforation and edema.

Contents of the invention

Aiming at the defects of the above-mentioned prior art, the utility model provides a medical catheter tip with measurable contact force, which can improve the safety of radiofrequency ablation surgery and provide reliable abutment force data support for doctors.

In order to achieve the above object, the utility model adopts the following technical solutions:

A medical catheter head end capable of measuring contact force, the medical catheter head end includes a head end electrode, a force-measuring module and a fixing member, and the head-end electrode and the force-measuring module are fixed on the Together; the force-measuring module includes a slider main body, a rigid beam and a support fixed on the rigid beam; wherein, the slider main body is provided with several protruding slider members; the rigid beam is provided with An inner cavity that penetrates axially; several sliding resistors are set on the support; each slider member corresponds to the sliding resistors through a resistance detection head installed at the tail end of the member; the tail of the head electrode is connected to Wires; each of the slider members and each of the sliding resistors is connected to the wires; the wires connected to the tail of the head end electrodes, the wires connected to each of the slider members, and the wires connected to each of the sliding resistors The wires all pass through the lumen of the rigid beam and go straight to the tail end of the catheter.

In the above solution, preferably, the plurality of slider components are insulated from each other.

In the above solution, preferably, the plurality of sliding resistors are insulated from each other.

In the above solution, preferably, the sliding resistor is insulated from the support member.

In the above solution, preferably, the fixing member is an annular metal member.

In the above solution, preferably, the fixing member is fixed together with the inner wall of the head-end electrode, and both the rigid beam and the main body of the slider are fixed to the fixing member.

In the above solution, preferably, the plurality of slider components are evenly distributed along the circumferential direction of the slider body.

In the above solution, preferably, the support member is in the shape of a ring.

In the above solution, preferably, the rigid beam is an elastic beam.

In the above solution, preferably, the support member is flush with the lower end of the rigid beam.

In the above solution, preferably, when the head electrode is subjected to an axial force, the rigid beam undergoes compressive deformation in the axial direction, and the resistance detection heads slide along the sliding resistance, thereby causing resistance The change of the resistance value detected by the different resistance detection heads is consistent, and the force magnitude and direction of the head end electrode can be calculated through the change of the resistance value and the coefficient.

Preferably in the above solution, when the head-end electrode is subjected to radial force, the rigid beam is bent and deformed in the radial direction, and the resistance detection heads slide along the sliding resistance, thereby causing a resistance value At this time, the resistance values detected by the different resistance detection heads are different, and the force magnitude and direction of the head electrode can be calculated through the change and coefficient of the resistance value.

In the radiofrequency ablation operation, the doctor uses the medical catheter head end with measurable contact force described in the utility model and judges the ablation depth by measuring the pressure of the heart or arterial tissue rich in sympathetic nerve contacted by the catheter head end, providing doctors with reliable Supported by contact force data, doctors can choose a reasonable ablation power and time to ensure the safety of radiofrequency ablation within a safe value range. Therefore, the structure of the head end of the medical catheter described in the utility model is simple to process, and the contact force can be obtained through commonly used resistance data, which simplifies system data analysis, reduces errors in the system calculation process, and improves measurement accuracy.

Description of drawings

FIG. 1 is a schematic structural view of a medical catheter head end capable of measuring contact force according to a preferred embodiment of the present invention.

FIG. 2 is an anatomical view of the preferred embodiment depicted in FIG. 1 .

FIG. 3 is a schematic structural diagram of the fixing member 208 of the preferred embodiment shown in FIG. 2 .

Fig. 4 is a schematic diagram of the force on the head end of the preferred embodiment described in Fig. 1 .

detailed description

In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the utility model. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

The so-called head end and tail end refer to the support member 205, the end near the support member 205 is the tail end, and the far end relative to the support member 205 is the head end.

The utility model discloses a medical catheter head end capable of measuring contact force, which includes a head end electrode arranged at the end of the catheter, and is connected with the head end electrode to measure and calculate the force of the head end electrode and Directional force measuring device. When the head-end electrode is stressed, the sliding member slides along the sliding resistance, so that the magnitude of the force applied to the head-end electrode can be judged by the magnitude of the detected resistance value. In a preferred embodiment, three slider members and corresponding resistive probes and sliding resistors are selected.

Fig. 1 is a schematic structural view of a medical catheter tip capable of measuring contact force in a preferred implementation of the present invention. As shown in FIG. 1 , the medical catheter tip includes a tip electrode 1 and a force measuring module 2 . The force measuring module 2 includes a slider main body 201, three slider components 202, a rigid beam 203, three resistance probes 204 corresponding to the three slider components 202, a support 205, a rigid beam cavity 206 and three A sliding resistor 207.

The outside of the rigid beam 203 is solidified with the three slider members 202 , and a sliding resistor 207 is provided on the slider member 202 near the proximal end of each rigid beam 203 .

Wherein, the consolidation of the head electrode 1 , the rigid beam 203 , the slider member 202 and the sliding resistor 207 is only a small part, which does not affect the elastic deformation of the rigid beam 203 . The rigid beam 203 has good elasticity, and can produce a large deformation under a small pressure, and can fully recover to the original state after the pressure is removed.

The sliders are insulated from each other, and each slider is connected with a slider tail wire. The lead wire on the sliding resistor 207 and the tail wire on the slider pass through the cavity in the catheter to the tail end of the catheter.

A rigid beam lumen 206 is provided in the middle of the distal end of the rigid beam 203 , and the wire connected to the tail of the head-end electrode 1 can pass through the lumen 206 . The three sliding resistors 207 at the head end of the medical catheter are insulated from each other, and each of the sliding resistors 207 is connected to a slider wire. The lead wires on the sliding resistance and the tail wires on the slider pass through the hollow cavity of the catheter to the tail end of the catheter.

The distal end of the rigid beam 203 is integrated with the distal end of the slider member 202 , and the proximal end of the rigid beam 203 is integrated with the sliding resistor 207 . The rigid beam 203 is only partially consolidated with the slider member 202 and the sliding resistor 207 , which does not affect the deformation of the rigid beam 203 .

Three slider members 202 are arranged on the force measuring module 2, and each slider member 202 is respectively equipped with a resistance detection head 204, and each resistance detection head 204 corresponds to a sliding resistance 207, and each sliding resistance 207 is fixed on the supporting member 205 , and the sliding resistor 207 and the supporting member 205 are insulated from each other.

The three slider members 202 are fixed on the slider body 201 , and the slider members 202 are evenly distributed along the circumferential direction of the slider body 201 at intervals of 120 degrees.

FIG. 2 is an anatomical view of the preferred embodiment depicted in FIG. 1 . As shown in Figure 2, the head-end electrode 1 and the force-measuring module 2 are fixed together by a fixing part 208, as shown in Figure 3, the fixing part 208 is a ring-shaped metal piece (Figure 3 is a 2. Schematic diagram of the structure of the fixing member 208 in the preferred implementation.) The fixing member 208 and the inner wall of the head end electrode 1 are fixed together by welding, and then the rigid beam 203 and the The three slider members 202 are all fixed to the fastening member 208 .

The three slider members 202 are evenly distributed at intervals of 120 degrees along the circumferential direction of the inner wall of the head end electrode 1 . The supporting member 205 is circular and fixed with the rigid beam 203 , and the lower end of the supporting member 205 is kept flush.

Fig. 4 is a schematic diagram of the force on the head end of the preferred embodiment described in Fig. 1 . As shown in FIG. 4 , when the head electrode 1 is stressed, the rigid beam 203 will be deformed.

When the head electrode 1 is subjected to an axial force, the rigid beam 203 undergoes compressive deformation in the axial direction. At this time, the three resistance detection heads 204 slide along the sliding resistance 207, thereby causing a change in resistance value, and the three resistance detection heads 204 slide The changes of the resistance values detected by the head 204 are consistent. At this time, according to the changes of the three detected resistance values, combined with the deformation coefficient of the rigid beam, the magnitude of the axial force on the head electrode 1 can be calculated.

When the head electrode 1 is subjected to a radial force, the rigid beam 203 bends and deforms in the radial direction. At this time, the three resistance detection heads 204 will also slide along the sliding resistance 207, thereby causing a change in the resistance value. The resistance values and their changes detected by the resistance detection heads 204 are different. According to the changes of the detected resistance values and the deformation coefficient of the rigid beam, the magnitude and specific direction of the force on the head electrode 1 can be calculated.

In actual use, the force on the head electrode 1 is complicated, and it will be subjected to dual effects from axial force and radial force. Therefore, the resistance values detected by the three resistance detection heads 204 and their changes need to be considered comprehensively, and combined with factors such as the deformation coefficient of the rigid beam, the magnitude and specific direction of the force on the head electrode 1 can be calculated.

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it still can Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present utility model .

Claims (10)

1. A medical catheter tip with measurable contact force, characterized in that, the medical catheter tip includes a tip electrode, a force-measuring module and a consolidation piece, The head-end electrode and the force-measuring module are fixed together by the fixing member; The force-measuring module includes a slider body, a rigid beam, and a support fixed on the rigid beam; in, The slider body is provided with a plurality of protruding slider members; The rigid beam is provided with an axially penetrating inner cavity; A number of sliding resistors are set on the support; Each of the slider components is in one-to-one correspondence with the sliding resistance through a resistance detection head installed at the tail end of the component; The tails of the head-end electrodes are connected with wires; each of the slider members and each of the sliding resistors are connected with wires; The wires connected to the tail of the head electrode, the wires connected to each of the slider members, and the wires connected to each of the sliding resistors pass through the lumen of the rigid beam and go straight to the tail end of the catheter . 2. The medical catheter tip according to claim 1, wherein the plurality of slider members are insulated from each other. 3. The medical catheter tip according to claim 1, wherein the plurality of sliding resistors are insulated from each other. 4 . The medical catheter tip according to claim 1 , wherein the sliding resistor is insulated from the support member. 5. The medical catheter head end according to claim 1, wherein the fixing member is an annular metal member. 6. The medical catheter tip according to claim 1 or 5, wherein the fixing member is fixed to the inner wall of the tip electrode, and the rigid beam and the slider main body are fixed to on the fixture. 7 . The medical catheter tip according to claim 1 , wherein the plurality of slider members are evenly spaced apart from each other along the circumferential direction of the slider body. 7 . 8 . The medical catheter tip according to claim 1 , wherein the support member is in the shape of a ring. 9. The medical catheter tip according to claim 1, wherein the rigid beam is an elastic beam. 10. The medical catheter tip according to claim 1, wherein the support member is flush with the lower end of the rigid beam.