CN105232141B - A kind of medical catheter head end for surveying contact force - Google Patents

Abstract

The invention provides a medical catheter head end capable of measuring contact force. The medical catheter head end includes an electrode head and a force-measuring device; the electrode head is provided with several blind holes; the force-measuring device includes several piezoelectric ceramics A spring sensor, a base, and several tail wires, and several through holes are arranged on the base. The invention simplifies the combination of the deformable body and the sensor into a two-in-one mode, thereby reducing assembly difficulty and errors, and improving the precision of the force-measuring head. The present invention measures the pressure of the catheter head in contact with the heart or the arterial tissue rich in sympathetic nerves to ensure that it is within a safe range to improve the safety of radiofrequency ablation operations; The ablation depth can be judged by the pressure of the tip and the contact tissue, providing reliable data support for doctors to choose a reasonable ablation power and time.

Description

A medical catheter tip with measurable contact force

technical field

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

Background technique

In medical interventional operations, radiofrequency ablation catheters have been widely used, and are mainly used in the treatment of atrial fibrillation, arrhythmia, refractory hypertension and other diseases. With the assistance of an X-ray machine, the doctor punctures the femoral artery or the radial artery and inserts the radiofrequency ablation catheter through the blood vessel into the heart or an artery rich in sympathetic nerves to perform radiofrequency ablation of the lesion.

At present, this radiofrequency ablation operation is performed manually by experienced doctors. Since 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 in heart and artery ablation operations. occur.

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

Contents of the invention

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

To achieve the above object, the present invention adopts the following technical solutions:

A medical catheter head end capable of measuring contact force, the medical catheter head end includes an electrode head and a force-measuring device; the electrode head is provided with several blind holes; the force-measuring device includes several piezoelectric ceramic spring sensors, A base and a plurality of tail wires, the base is provided with a plurality of through holes; wherein, the head end of each piezoelectric ceramic spring sensor is respectively corresponding and fixed in the blind hole; each piezoelectric ceramic spring sensor Tail ends of the spring sensors correspond to and are fixed to the through holes of the base, and are respectively connected to corresponding tail wires through the through holes.

In the above solution, preferably, the tail wires are located inside the conduit main body, and the tail wires pass through the catheter main body to connect with the demodulation device.

In the above solution, preferably, the conduit main pipe is fixedly connected to the base.

In the above solution, preferably, the plurality of piezoelectric ceramic spring sensors are placed between the electrode head and the base along the radial direction.

In the above solution, preferably, the plurality of piezoelectric ceramic spring sensors are evenly distributed along the circumferential direction of the catheter.

In the above solution, preferably, the numbers of the blind holes, the piezoelectric ceramic spring sensors, the tail wires and the through holes on the base are equal.

In the above solution, preferably, the number of through holes on the blind hole, the piezoelectric ceramic spring sensor, the tail wire and the base is three.

The invention simplifies the combination of the deformable body and the sensor into a two-in-one mode, thereby reducing assembly difficulty and errors, and improving the precision of the force-measuring head. The present invention measures the pressure of the catheter head in contact with the heart or the arterial tissue rich in sympathetic nerves to ensure that it is within a safe range to improve the safety of radiofrequency ablation operations; The ablation depth can be judged by the pressure of the tip and the contact tissue, providing reliable data support for doctors to choose a reasonable ablation power and time.

Description of drawings

Fig. 1 is a structural schematic diagram of a medical catheter tip capable of measuring contact force according to the present invention.

Fig. 2 is a schematic diagram of the installation position of the head end of a medical catheter with measurable contact force on the catheter according to the present invention.

Fig. 3 is a structure diagram of a base of a medical catheter head end on the catheter with measurable contact force according to the present invention.

Detailed ways

In the prior art, the structure of the head end of the pressure-measurable catheter described in CN201420301029.9 requires a combination of a deformable body and several sensors, so the extra accessories will cause large measurement errors. In the present invention, the structure of the deformable body is removed, and the combination of the deformable body and the sensor is simplified into a two-in-one mode, thereby reducing assembly difficulty and errors, and improving the accuracy of the force-measuring head.

In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, 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 invention.

The so-called head end and tail end are based on the base 3 as a reference, the end near the base 3 is the tail end, and the far end relative to the base 3 is the head end.

The invention provides a medical catheter head end capable of measuring contact force, the head end includes an electrode head, and a force-measuring device connected with the electrode head for calculating the force magnitude and direction of the electrode head.

Wherein, the force-measuring device includes several piezoelectric ceramic spring sensors that can deform according to changes in force, and the magnitude and direction of the force on the electrode head can be obtained through different deformation amounts of the several piezoelectric ceramic spring sensors. The plurality of piezoelectric ceramic spring sensors are placed between the electrode head and the base of the medical catheter along the radial direction, and the plurality of piezoelectric ceramic spring sensors are evenly distributed along the circumferential direction of the catheter.

The piezoelectric ceramic spring sensor is in the shape of a spring. When the electrode tip of the medical catheter is stressed, the piezoelectric ceramic spring sensors deform and generate electrical signals (accurate to millivolts), which are derived through the tail wires connected thereafter, and the tail wires After the connected demodulation device obtains the electrical signal, it detects, analyzes and calculates, and finally obtains the magnitude and direction of the force on the head end of the medical catheter.

Fig. 1 is a structural schematic diagram of a medical catheter tip capable of measuring contact force according to the present invention. As shown in Figure 1, the medical catheter head end includes an electrode tip 1 and three blind holes (501, 502, 503) arranged on the electrode tip 1 and a force-measuring device, and the force-measuring device includes three piezoelectric Ceramic spring sensors (201, 202, 203), base 3, three pigtails (401, 402, 403).

Fig. 3 is a structure diagram of a base of a medical catheter head end on the catheter with measurable contact force according to the present invention. Three through holes 601 , 602 , 603 are provided on the base 3 .

Wherein, one end of each piezoelectric ceramic spring sensor 201, 202, 203 corresponds to and is fixed in the three blind holes 501, 502, 503 respectively, and each piezoelectric ceramic spring sensor 201, 202, 203 The other ends of the corresponding and fixed to the through holes 601, 602, 603, adjust the distance between the three piezoelectric ceramic spring sensors 201, 202, 203 between the electrode head 1 and the base 3, so that they are consistent . Tail wires 401 , 402 , 403 are respectively connected to tail ends of each of the piezoelectric ceramic spring sensors 201 , 202 , 203 .

Fig. 2 is a schematic diagram of the installation position of the head end of a medical catheter with measurable contact force on the catheter according to the present invention. As shown in FIG. 2 , three tail wires 401 , 402 , 403 are connected to the proximal end of the catheter through the catheter main tube 5 , and finally connected to the demodulation device through the catheter main tube 5 . The catheter main pipe 5 includes three tail wires 401 , 402 , 403 , and the head end of the catheter main pipe 5 is fixed with the base 3 .

When the electrode head 1 is stressed, the three piezoelectric ceramic spring sensors 201, 202, 203 will be deformed, and the millivolt signal caused by the deformation will be transmitted to the demodulation device through the three tail wires 401, 402, 403, The calculation of the adjustment equipment can get the precise magnitude and direction of the force.

In the ablation operation, the medical catheter tip provided by the present invention is applied to the radio frequency ablation catheter by connecting the electrode tip with a force measuring device, and can measure the pressure value of the catheter tip touching the heart or arterial tissue rich in sympathetic nerves. Judging the ablation depth provides reliable data support for doctors to choose a reasonable ablation power and time, and makes it within a safe value range through operation to improve the safety of radiofrequency ablation surgery.

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still understand the foregoing The technical solutions recorded in each embodiment are modified, or some of the technical features are replaced equivalently; 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 invention.

Claims (5)

1. A medical catheter head end capable of measuring contact force, characterized in that the medical catheter head end includes an electrode head and a force measuring device; the electrode head is provided with some blind holes; The force-measuring device includes several piezoelectric ceramic spring sensors, a base, and some tail wires, and several through holes are arranged on the base, and the blind holes, the piezoelectric ceramic spring sensors, the tail wires, and the base are provided with The number of through holes is 3; in, The head end of each piezoelectric ceramic spring sensor corresponds to and is fixed in the blind hole; The tail end of each piezoelectric ceramic spring sensor is respectively corresponding to and fixed to the through hole of the base, and is respectively connected to the corresponding tail wire through the through hole. 2 . The medical catheter tip according to claim 1 , wherein the plurality of tail wires are located inside the main catheter main body, and the tail wires pass through the main catheter main body to connect with the demodulation device. 3 . 3. The medical catheter tip according to claim 1, wherein the catheter main tube is fixedly connected to the base. 4. The medical catheter tip according to claim 1, wherein the plurality of piezoelectric ceramic spring sensors are placed between the electrode tip and the base along the radial direction. 5. The medical catheter tip according to claim 1, wherein the plurality of piezoelectric ceramic spring sensors are evenly distributed along the circumferential direction of the catheter.