A deformable high-precision balloon cardiac cavity mapping catheter

Abstract

The present invention relates to the field of medical equipment technology, and in particular to a deformable high-precision balloon cardiac cavity mapping catheter, comprising a catheter, an electrode tip installed at one end of the catheter, and a handle installed at the other end of the catheter, wherein the electrode tip is provided with a head electrode pair, an intermediate expansion body, and a rear end expansion body from left to right in sequence, and a liquid storage device is provided on the surface of the handle, wherein the liquid storage device comprises a liquid storage tube, and a liquid outlet head is provided at one end of the liquid storage tube. The beneficial effects of the present invention are as follows: the deformable high-precision balloon cardiac cavity mapping catheter injects liquid into the electrode tip by providing a liquid storage device, and utilizes the expansion of the head electrode pair, the intermediate expansion body, and the rear end expansion body to change the overall shape of the electrode tip, and perfectly fits with various parts of the heart, does not squeeze or push the heart, and does not need to be repeatedly bent in the cardiac cavity, thereby facilitating high-precision mapping.

Description

Technical Field

[0001] The invention relates to the technical field of medical equipment, and in particular to a deformable high-precision balloon cardiac cavity mapping catheter. Background Art

[0002] Cardiac cavity mapping catheters are used to construct a three-dimensional electroanatomical model of the cardiac cavity. For various arrhythmias, especially complex arrhythmias, it is crucial to understand the electrical conduction and anatomical information of various parts of the cardiac cavity to clarify the mechanism of arrhythmia. For example, pulmonary vein isolation for the treatment of atrial fibrillation requires the construction of a left atrial electroanatomical model. If the direction and length of the pulmonary vein muscle bundles can be mastered by constructing an accurate pulmonary vein vestibule electroanatomical model, the efficiency of pulmonary vein isolation can be improved.

[0003] At present, the contact mapping catheters for cardiac cavity mapping mainly include 4-10-pole linear, 10-12-pole circular, 16-pole grid and 64-pole blue. These catheters have limited number of electrodes in contact with the cardiac cavity, and sometimes poor contact, or even push the heart, resulting in inaccurate electrical information and anatomical positioning of the cardiac cavity, and thus inaccurate three-dimensional cardiac cavity model. In view of this, we propose a deformable high-precision balloon cardiac cavity mapping catheter. Summary of the invention

[0004] The object of the present invention is to provide a deformable high-precision balloon cardiac cavity mapping catheter to solve the problem in the above-mentioned background technology that the number of electrodes contacting the mapping catheter with the heart is limited and the contact is sometimes poor.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A deformable high-precision balloon cardiac cavity mapping catheter comprises a catheter, an electrode tip installed at one end of the catheter and a handle installed at the other end of the catheter, a tail wire interface is provided at the bottom of the handle, the electrode tip is provided with a head electrode pair, a middle expansion body and a rear end expansion body from left to right, a plurality of first electrode pairs are provided on one side of the electrode tip close to the middle expansion body and the rear end expansion body, a magnetic sensor is provided at the surface center position of the head electrode pair, and a plurality of second electrode pairs are provided in a circular array outside the magnetic sensor.

[0007] Preferably, each of the first electrode pair and each of the second electrode pair consists of two microelectrodes, and each of the microelectrodes is connected to one side of the tail line interface through a wire.

[0008] Preferably, the head end electrode pair and the intermediate expansion body are an integrally formed structure.

[0009] Preferably, the interior of the electrode tip is a hollow structure, and the electrode tip is in communication with the catheter.

[0010] Preferably, a liquid storage device is provided on the surface of the handle, and the liquid storage device includes a liquid storage tube, a liquid outlet head is provided at one end of the liquid storage tube, a sealing tube plugged with the liquid storage tube is provided at the other end of the liquid outlet head, a push rod is provided at the other end of the liquid storage tube, a plug plate slidably connected to the liquid storage tube is provided at one end of the push rod, and a push plate is installed at the other end of the push rod.

[0011] Preferably, the push plate and the push rod are an integrally formed structure.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The deformable high-precision balloon cardiac cavity mapping catheter is provided with a liquid storage device to inject liquid into the electrode tip, and the electrode tip is formed into a rod-shaped, conical or spherical shape through the expansion of the head electrode pair and the middle expansion body. The length and diameter of these shapes are adjustable. The rod-shaped and conical parts can enter the coronary veins, superior and inferior vena cava, pulmonary veins and left and right ventricular outflow tracts, so as to perform rapid and accurate electroanatomical mapping of these parts.

[0014] 2. The deformable high-precision balloon cardiac cavity mapping catheter has a rod-shaped and cone-shaped electrode tip that can be bent into an arc shape, and the catheter connected thereto can be bent in both directions, so that the electrode tip can move in the cardiac cavity and abut against the endocardium to achieve cardiac cavity electroanatomical mapping.

[0015] 3. The deformable high-precision balloon cardiac cavity mapping catheter has an inflatable or liquid balloon at the tip, which will not squeeze the heart and cause deformation of the cardiac cavity. The surface is covered with electrodes, which can fit perfectly with various parts of the heart, facilitating rapid and high-precision cardiac cavity electroanatomical mapping of the tip electrode pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the balloon electrode tip of the present invention when it is not expanded;

[0017] Figure 2 It is a schematic diagram of the balloon electrode tip portion of the present invention when expanded;

[0018] Figure 3 It is a schematic diagram of the electrode tip structure of the present invention;

[0019] Figure 4 It is a schematic diagram of the structure of the head end electrode pair of the present invention;

[0020] Figure 5 It is a schematic diagram of the structure decomposition of the liquid storage device of the present invention;

[0021] Figure 6 It is a schematic diagram of the electrode tip structure in a specific embodiment 4 of the present invention;

[0022] Figure 7 It is a schematic diagram of the electrode tip structure in specific embodiment 5 of the present invention.

[0023] In the figure: 1. catheter; 2. electrode tip; 21. tip electrode pair; 22. middle expansion body; 23. rear end expansion body; 24. first electrode pair; 25. second electrode pair; 26. magnetic sensor; 3. handle; 31. tail line interface; 4. liquid storage device; 41. liquid storage tube; 42. liquid outlet head; 43. sealing tube; 44. push rod; 45. plug plate; 46. push plate. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] Example 1

[0028] A deformable high-precision balloon cardiac cavity mapping catheter, such as Figures 1 to 4As shown, it includes a catheter 1, an electrode tip 2 installed at one end of the catheter 1 and a handle 3 installed at the other end of the catheter 1, a tail line interface 31 is arranged at the bottom of the handle 3, the electrode tip 2 is provided with a head end electrode pair 21, an intermediate expansion body 22 and a rear end expansion body 23 from left to right, a plurality of first electrode pairs 24 are arranged on one side of the electrode tip 2 close to the intermediate expansion body 22 and the rear end expansion body 23, a magnetic sensor 26 is arranged at the center position of the surface of the head end electrode pair 21, a plurality of second electrode pairs 25 are arranged in a circular array outside the magnetic sensor 26, each first electrode pair 24 and each second electrode pair 25 are composed of two microelectrodes, and each microelectrode is connected to one side of the tail line interface 31 through a wire, the head end electrode pair 21 and the intermediate expansion body 22 are an integrally formed structure, the interior of the electrode tip 2 is a hollow structure, and the electrode tip 2 and the catheter 1 are connected.

[0029] In this embodiment, two electrodes are bonded together by insulating rubber to form an electrode pair, and two adjacent electrode pairs are bonded and fixed by elastic rubber, so that when the electrode tip expands, the distance between the electrodes remains unchanged, and the distance between the electrode pairs is variable.

[0030] Specifically, the head end electrode pair 21, the middle expansion body 22 and the rear end expansion body 23 are all made of elastic rubber material, and the thickness of the head end electrode pair 21 is greater than the thickness of the middle expansion body 22, and the thickness of the middle expansion body 22 is greater than the thickness of the rear end expansion body 23. The different thicknesses of the head end electrode pair 21, the middle expansion body 22 and the rear end expansion body 23 are utilized to control the deformation effects of the head end electrode pair 21, the middle expansion body 22 and the rear end expansion body 23.

[0031] In addition, the catheter 1 is a PP folding tube, so that the catheter 1 can be folded in two directions, which is convenient for the use of the catheter 1.

[0032] In addition, the catheter 1 and the electrode tip 2 are bonded and fixed by glue, which makes it convenient to install the electrode tip on the surface of the catheter 1.

[0033] It is worth noting that the magnetic sensor 26 is a magnetic coil, and a magnetic field generator is disposed outside the magnetic sensor 26 . The magnetic field generator emits multiple magnetic fields, so that each magnetic field can generate an induced current on the magnetic sensor 26 .

[0034] In this embodiment, 81 electrodes are arranged on the outer surfaces of the middle expansion body 22 and the rear end expansion body 23 .

[0035] Example 2

[0036] like Figure 5As shown, a liquid storage device 4 is provided on the surface of the handle 3, and the liquid storage device 4 includes a liquid storage tube 41, one end of the liquid storage tube 41 is provided with a liquid outlet head 42, the other end of the liquid outlet head 42 is provided with a sealing tube 43 plugged with the liquid storage tube 41, the other end of the liquid storage tube 41 is provided with a push rod 44, one end of the push rod 44 is provided with a plug plate 45 slidably connected to the liquid storage tube 41, and the other end of the push rod 44 is installed with a push plate 46, and the push plate 46 and the push rod 44 are an integrally formed structure.

[0037] In this embodiment, the liquid outlet head 42 penetrates the surface of the handle 3 and is adhered to the connection between the liquid outlet head 42 and the handle 3 by means of a sealant, so that liquid can easily enter the handle 3 from the liquid outlet head 42 .

[0038] Specifically, an annular sealing ring should be further provided at one end of the sealing tube 43 so that the sealing tube 43 and the liquid storage tube 41 are tightly connected.

[0039] In addition, the plug plate 45 is made of rubber material, so that the plug plate 45 and the inner wall of the liquid storage tube 41 fit tightly, and the plug plate 45 is used to squeeze out the liquid inside the liquid storage tube 41.

[0040] Example 3

[0041] Insert the rear expansion body 23 of the electrode tip 2 into the catheter 1, and squeeze the push plate 46 to make the push rod 44 slide in the liquid storage tube 41, so that part of the liquid in the liquid storage tube 41 is pressed into the catheter 1 and enters the electrode tip 2. At this time, the rear expansion body 23 is located in the catheter 1 and cannot expand, while the middle expansion body 22 is squeezed by the liquid to expand, forming a Figure 2 shape, at this time, the catheter 1 is inserted into the heart, and the electrode tip 2 is bent, and the electrode tip 2 is rotated so that the first electrode pair 24 and the second electrode pair 25 are fully in contact with the heart wall, and at the same time, the pulmonary vein, superior vena cava, ventricular outflow tract and other parts can be entered to quickly build an accurate model of the part.

[0042] Example 4

[0043] The electrode tip 2 is completely located outside the catheter 1, and the push plate 46 is squeezed to make the push rod 44 slide in the liquid storage tube 41, so that part of the liquid in the liquid storage tube 41 is pressed into the catheter 1 and enters the electrode tip 2, and the rear end expansion body 23 is not fully expanded. At this time, since the thickness of the middle expansion body 22 is greater than that of the rear end expansion body 23, the expansion effect of the middle expansion body 22 is weaker than that of the rear end expansion body 23, forming Figure 6 shape.

[0044] Example 5

[0045] The electrode tip 2 is completely located outside the catheter 1, and the push plate 46 is squeezed to make the push rod 44 slide in the liquid storage tube 41, so that all the liquid in the liquid storage tube 41 is pressed into the catheter 1 and into the electrode tip 2, and the middle expansion body 22 and the rear expansion body 23 are fully expanded to form Figure 7 shape.

[0046] In the above embodiments, a liquid storage device 4 is provided to inject liquid into the electrode tip 2, and the overall shape of the electrode tip 2 is changed by utilizing the expansion of the tip electrode pair 21, the middle expansion body 22 and the rear end expansion body 23, so that it fits perfectly with various parts of the heart without squeezing or pushing the heart and without the need for repeated bending in the heart cavity, thereby facilitating high-precision mapping.

[0047] The wall thickness of the middle expansion body 22 and the rear expansion body 23 changes gradually. During actual preparation, a small gap can be opened first, and then the electrode pair is inserted. The head end electrode pair 21 is sealed with the middle expansion body 22, and the electrode wire is routed from the inside of the middle expansion body 22 to the signal acquisition end.

[0048] The balloon can be inflated with gas or liquid. The device for controlling the inflating and discharging is not protected by this patent and can be realized by using existing technology. The size of the balloon can be better controlled by inflating and discharging liquid because gas is compressible, but both should be included in the protection. The size of the balloon can be controlled by manually operating the liquid storage tank. The liquid storage tank can be 30 to 50 ml and does not need to be too large, but it needs to be practical with a valve to prevent liquid reflux.

[0049] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A deformable high-precision balloon cardiac cavity mapping catheter, comprising a catheter (1), an electrode tip (2) mounted at one end of the catheter (1), and a handle (3) mounted at the other end of the catheter (1), characterized in that: The bottom of the handle (3) is provided with a tail line interface (31), the electrode head end (2) is provided with a head end electrode pair (21), a middle expansion body (22) and a rear end expansion body (23) in sequence from left to right, the electrode head end (2) is provided with a plurality of first electrode pairs (24) on one side close to the middle expansion body (22) and the rear end expansion body (23), a magnetic sensor (26) is provided at the center of the surface of the head end electrode pair (21), and a plurality of second electrode pairs (25) are provided in a circular array outside the magnetic sensor (26); Each of the first electrode pair (24) and each of the second electrode pair (25) is composed of two microelectrodes, and each of the microelectrodes is connected to one side of the tail line interface (31) through a wire; the head end electrode pair (21) and the intermediate expansion body (22) are an integrally formed structure; the interior of the electrode head end (2) is a hollow structure, and the electrode head end (2) and the catheter (1) are connected; a liquid storage device (4) is provided on the surface of the handle (3), and the liquid storage device (4) includes a liquid storage tube (41), one end of the liquid storage tube (41) is provided with a liquid outlet head (42), and the other end of the liquid outlet head (42) is provided with a seal that is plugged into and matched with the liquid storage tube (41). A sealing tube (43), a push rod (44) is provided at the other end of the liquid storage tube (41), a plug plate (45) slidably connected to the liquid storage tube (41) is provided at one end of the push rod (44), and a push plate (46) is installed at the other end of the push rod (44); the push plate (46) and the push rod (44) are an integrally formed structure; the electrode tip (2) is filled with liquid by providing a liquid storage device (4), and the overall shape of the electrode tip (2) is changed by utilizing the expansion of the tip electrode pair (21), the middle expansion body (22) and the rear end expansion body (23), and the electrode tip (2) fits perfectly with various parts of the heart, does not squeeze or push the heart, and does not need to be repeatedly bent in the heart cavity, thereby facilitating high-precision mapping; The head end electrode pair (21), the middle expansion body (22) and the rear end expansion body (23) are all made of elastic rubber material, and the thickness of the head end electrode pair (21) is greater than the thickness of the middle expansion body (22), and the thickness of the middle expansion body (22) is greater than the thickness of the rear end expansion body (23).

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