Interventional catheter capable of achieving accurate transmission

Abstract

The utility model discloses an interventional catheter capable of accurately transmitting, which comprises a sheathing canal body with a sheathing canal inner cavity; the driving shaft comprises a plurality of spiral sections which are sequentially connected in the axial direction, the driving shaft is arranged in the inner cavity of the sheathing canal, and the driving shaft can be driven to rotate and / or move relative to the sheathing canal body; the functional part is used for treating or detecting tissues, and the functional part is connected to the far end of the driving shaft; the transmission part is made of a material with large elastic modulus, the far end of the transmission part is fixedly connected with the far end of the driving shaft and / or the functional part, and the near end of the transmission part is fixedly connected with the near end of the driving shaft; wherein the transmission part and the driving shaft are arranged in parallel, and the transmission part restrains the increase of the distance between the spiral sections and the extension of the single spiral section. According to the interventional catheter capable of achieving accurate transmission, by means of the tensile property of the transmission part, the accuracy of transmitting axial displacement is improved, and then the treatment or detection precision is improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and more specifically, to an interventional catheter capable of precise transmission. Background Technology

[0002] In existing interventional catheters, to perform therapeutic or diagnostic functions, it is necessary to rotate and move the therapeutic or diagnostic components axially within the distal end of the catheter. The catheter contains a drive shaft, whose function is to transmit torque or thrust / pull force from the proximal end of the catheter to the therapeutic or diagnostic components at the distal end.

[0003] Because the catheter needs to remain flexible to traverse tortuous and complex tissue structures, the drive shaft also needs to have the corresponding flexibility to support and ensure the catheter's propulsion. At the same time, the drive shaft also needs to transmit the force from the proximal end to the distal treatment or detection component, i.e., good torque transmission characteristics and axial force transmission characteristics.

[0004] However, in existing catheters, the drive shaft, under bending or internal resistance, often causes the force transmitted from the proximal end to the distal treatment or detection components to be buffered and reduced, making it impossible to accurately transmit axial displacement. This reduces the accuracy of treatment or detection and makes it difficult or even wrong for operators to judge the condition of the distal end of the catheter. At the same time, when the drive shaft is pulled, the cable inside the drive shaft is subjected to tension, which may lead to a break in the lead wire, causing the catheter to lose its treatment or detection function.

[0005] In summary, how to solve the problem of the difficulty in accurately transmitting axial displacement within the interventional catheter drive shaft, which leads to a decrease in treatment or detection accuracy, is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide an interventional catheter that can be precisely driven, so as to reduce or alleviate the problems existing in the prior art, thereby improving the accuracy of treatment or detection.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] An interventional catheter capable of precise manipulation, comprising:

[0009] The sheath body has a sheath cavity; a drive shaft comprising a plurality of helical segments connected sequentially along the axial direction, the drive shaft being arranged within the sheath cavity and capable of being driven to rotate and / or move relative to the sheath body; a functional component for treating or detecting tissue, the functional component being connected to the distal end of the drive shaft; and a transmission component made of a material with a high elastic modulus, the distal end of the transmission component being fixedly connected to the distal end of the drive shaft and / or the functional component, and the proximal end of the transmission component being fixedly connected to the proximal end of the drive shaft.

[0010] The transmission component is arranged parallel to the drive shaft, and the transmission component suppresses the increase in the distance between each of the spiral segments and the elongation of each individual spiral segment.

[0011] In some embodiments, the transmission element is a flexible line, the flexible line includes a connecting section and an intermediate section, the far end and the near end of the flexible line are both the connecting section, the intermediate section is disposed between the two connecting sections, and the intermediate section is arranged in the hollow part of the helical joint and parallel to the drive shaft.

[0012] In some embodiments, the plurality of helical segments have equal pitches, the distal and proximal ends of the flexible line are both connected to the drive shaft, and the length of the middle segment of the flexible line is L, where L=n*P, and n is the number of helical segments spanned by the middle segment, and P is the pitch.

[0013] In some embodiments, the drive shaft or the functional component is provided with a mounting groove for holding the connecting segment of the knotted flexible wire, and the mounting groove is filled with a fixing adhesive for fixing the knot of the flexible wire.

[0014] In some embodiments, a drive unit is further included, wherein the length of the axial overlap portion between the transmission member and the drive shaft is the same.

[0015] The drive unit drives the drive shaft and the transmission component to rotate synchronously, and / or the drive unit drives the drive shaft and the transmission component to move synchronously toward the proximal end of the sheath body to retract.

[0016] In some embodiments, the sheath assembly includes the sheath body and a connecting assembly, the distal end of the connecting assembly being fixed to the proximal end of the sheath body, the connecting assembly having a connecting cavity, the connecting assembly having a push seal extending into the connecting cavity, the proximal end of the drive shaft being rotatable and / or movable relative to the connecting cavity, and the proximal end of the drive shaft slidingly abutting against the push seal.

[0017] In some embodiments, the connecting assembly includes, from distal to proximal end, a first connector, a second connector, a third connector, a push seal, and a fourth connector; the first connector is fixedly connected to the proximal end of the sheath body, and the inner cavity of the first connector is coaxial and communicates with the inner cavity of the sheath body; the second connector is fixedly coaxially connected to the proximal end of the first connector, and the proximal end of the second connector is fixedly provided with a first portion of the push seal, and the distal end of the fourth connector is fixedly provided with a second portion of the push seal; the third connector is a sleeve structure, and the third connector respectively wraps around the proximal end of the second connector, the distal end of the fourth connector, and the push seal, and makes the second connector, the fourth connector, and the push seal coaxial.

[0018] In some embodiments, the sheath assembly further includes a rigid tube sleeved over the proximal end of the drive shaft, the rigid tube having a higher rigidity than the drive shaft, and the outer wall of the rigid tube slidingly sealingly abutting against the inner wall of the push seal.

[0019] In some embodiments, the inner lumen of the sheath is filled with a chemically inert oil, and the functional component is an ultrasonic probe.

[0020] In some embodiments, the drive shaft is in the form of a double-layered helical spring or a triple-layered helical spring.

[0021] The interventional catheter with precise transmission provided by this utility model has at least the following advantages compared with the prior art:

[0022] By setting up a flexible line parallel to the drive shaft, the high tensile strength of the flexible line is used to axially transmit the tension between the treatment or detection component and the drive unit. This allows the drive unit to accurately transmit displacement when dragging the treatment or detection component proximally, thereby improving the accuracy of treatment or detection. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of an interventional catheter in the prior art;

[0025] Figure 2 This is a schematic diagram of the distal sheath of an interventional catheter and its internal structure in the prior art.

[0026] Figure 3 This is a schematic diagram of the proximal end of the sheath body provided by this utility model;

[0027] Figure 4 A schematic diagram of the mounting structure of the drive unit provided by this utility model;

[0028] Figure 5 A schematic diagram of the installation structure at the far end of the flexible wire provided by this utility model;

[0029] Figure 6 A schematic diagram of the installation structure of the near end of the flexible wire provided by this utility model;

[0030] Figure 7 A schematic diagram of another installation structure for the distal end of the flexible wire provided by this utility model;

[0031] Figure 8 This is a schematic diagram of another mounting structure for the near end of the flexible wire provided by this utility model;

[0032] Figure 9 This is a schematic diagram of the transmission component provided by this utility model.

[0033] Figures 1-9 middle:

[0034] 1. Sheath assembly; 11. Sheath body; 12. First connecting assembly; 13. Second connecting assembly; 14. Third connecting assembly; 15. Fourth connecting assembly; 16. Push seal;

[0035] 2. Handle assembly;

[0036] 3. Core; 31. Moving part; 311. Treatment or detection component; 312. Base; 32. Cable; 33. Drive shaft; 331. Spiral joint; 34. Rigid tube; 35. Drive unit;

[0037] 4. Flexible line. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. In the specific embodiments, the distal end refers to the portion of the corresponding component away from the operator, typically the end where the component enters the patient's body or surgical area. The proximal end is the portion of the corresponding component closer to the operator, typically the end held or manipulated by the operator. For a single component, the end closer to the operator is the proximal end, and the end further away from the operator is the distal end. Furthermore, it should be noted that the connections mentioned in this application include both direct connections between systems, components, and parts, and indirect connections between systems, components, and parts via a medium. Those skilled in the art should not interpret this as a limitation but should adapt it according to specific needs, and none of these exceed the protection scope of this application. For example, this application describes a fixed connection between the proximal end of the transmission component and the proximal end of the drive shaft, the purpose of which is to limit the correlation between the movement of the proximal end of the transmission component and the proximal end of the drive shaft. The specific implementation means can be a direct connection between the proximal end of the transmission component and the proximal end of the drive shaft, or a direct connection between the proximal end of the transmission component and the proximal end of the drive shaft via other media (such as a drive unit or connecting assembly), thereby achieving an indirect connection between the proximal end of the transmission component and the proximal end of the drive shaft.

[0040] In existing technologies, the drive shaft 33 encounters significant resistance during movement within the sheath body 11. When the catheter controller drives the treatment or detection component 311 proximally, the functional component 311 experiences movement lag or shortened stroke, failing to accurately transmit axial displacement one-to-one. This reduces the precision of treatment or detection and significantly restricts the function of the medical device. The core of this invention is to provide an interventional catheter capable of precise transmission. By utilizing the tensile strength of the transmission components, it ensures that the catheter drive controller can accurately transmit axial displacement when driving the treatment or detection component proximally, thereby improving the accuracy of treatment or detection.

[0041] Please refer to Figures 3-8 An interventional catheter capable of precise transmission includes a sheath body 11 with a sheath lumen; a drive shaft 33 comprising multiple helical segments 331 connected sequentially along the axial direction, the drive shaft 33 being arranged within the sheath lumen and capable of being driven to rotate and / or move relative to the sheath body 11; a functional component 311 for treating or detecting tissue, and the functional component 311 being connected to the distal end of the drive shaft 33; and a transmission component 4 made of a material with a high elastic modulus, the distal end of the transmission component 4 being fixedly connected to the distal end of the drive shaft 33 and / or the functional component 311, and the proximal end of the transmission component 4 being fixedly connected to the proximal end of the drive shaft 33.

[0042] The transmission component 4 is arranged parallel to the drive shaft 33, and it suppresses the increase in the distance between the spiral segments 331 and the elongation of individual spiral segments 331. Thanks to the flexibility of the transmission component 4, it does not affect the bending deformation of the drive shaft 33 and the sheath body 11, nor does it affect the torque transmitted by the drive shaft 33, thus ensuring the normal use of the interventional catheter.

[0043] In some embodiments, the sheath lumen is filled with a chemically inert oil, and the functional component 311 is an ultrasonic probe, such as... Figure 3 and Figure 4 As shown, the distal end of the drive shaft 33 is fixedly connected to the moving part 31. The moving part 31 includes a relatively fixed base 312 and a functional component 311, wherein the proximal end of the base 312 is fixedly connected to the distal end of the drive shaft 33. When the driving functional component 311 moves proximally, i.e. retracts, the ultrasound probe needs to be activated synchronously for imaging detection. The increase in the spacing between the helical joints 331 and the elongation of a single helical joint 331 will affect the moving distance of the ultrasound probe, resulting in the driving distance of the proximal end of the catheter not being executed in place. That is, the actual retraction distance of the ultrasound probe lags behind or cannot reach the expected driving distance of the proximal end. The addition of a transmission component with a large elastic modulus, due to the non-extensibility of the transmission component, enables the parallel drive shaft and transmission component to be synchronized. On this basis, the movement of the functional component can be made close to the expected retraction distance of the proximal end of the catheter.

[0044] In some embodiments, a drive unit 35 is also included, the length of the axially overlapping portion of the transmission member 4 and the drive shaft 33 is consistent, the drive unit 35 drives the drive shaft 33 and the transmission member 4 to rotate synchronously, and / or, the drive unit 35 drives the drive shaft 33 and the transmission member 4 to move synchronously toward the proximal end of the sheath body 11 to retract.

[0045] In some embodiments, the device further includes a drive unit 35, with the proximal end of the drive shaft 33 fixedly connected to the drive unit 35; the distal end of the drive unit 35 is fixedly connected to a rigid tube 34, the drive shaft 33 coaxially passes through the rigid tube 34, and a cable 32 for connecting the functional component 311 and the device end passes through the drive shaft 33.

[0046] The aforementioned moving part 31, cable 32, drive shaft 33, rigid tube 34 and drive part 35 together constitute the core part 3, and the distal end of the core part 3 is inserted from the proximal end of the sheath assembly 1.

[0047] In some embodiments, the sheath assembly 1 includes a sheath body 11, a rigid tube 34, and a connecting assembly fixed to and communicating with the proximal end of the sheath body 11. The connecting assembly is installed in the handle assembly 2, and the rigid tube 34 is axially slidably sealed to the cavity in the connecting assembly.

[0048] In some embodiments, the sheath assembly includes a sheath body 11 and a connecting assembly, the distal end of the connecting assembly being fixed to the proximal end of the sheath body 11, the connecting assembly having a connecting cavity, the connecting assembly having a push seal 16 extending into the connecting cavity, the proximal end of the drive shaft 33 being rotatable and / or movable relative to the connecting cavity, and the proximal end of the drive shaft 33 slidingly abutting against the push seal 16.

[0049] Furthermore, in some embodiments, the connecting assembly includes, from the distal end to the proximal end (i.e., from right to left in the diagram), a first connector 12, a second connector 13, a third connector 14, and a fourth connector 15 in sequence. The first connector 12 is fixedly connected to the proximal end of the sheath body 11, and the inner cavity of the first connector 12 is coaxial and communicates with the inner cavity of the sheath body 11. The second connector 13 is coaxially fixedly connected to the proximal end of the first connector 12, and the first part of the push seal 16 is fixedly disposed at the proximal end of the second connector 13. The second part of the push seal 16 is fixedly disposed at the distal end of the fourth connector 15. The third connector 14 is a sleeve structure that wraps around the proximal end of the second connector 13 and the distal end of the fourth connector 15, and also wraps around the push seal 16, so that the second connector 13, the fourth connector 15, and the push seal 16 are coaxial. The outer wall of the rigid tube 34 contacts and seals the inner wall of the push seal 16.

[0050] During operation, the drive unit 35 moves axially and transmits axial force through the drive shaft 33, driving the distal functional component 311 to move axially. When the driven functional component 311 moves distally, the axial transmission capability of the drive shaft 33 enables the displacement of the drive unit 35 to be transmitted to the distal functional component 311. When the driven functional component 311 moves proximally, the high axial tensile strength of the transmission component 4 enables the displacement of the drive unit 35 to be transmitted to the distal functional component 311 in a one-to-one ratio. That is, the displacement of the drive unit 35 in both axial directions can be transmitted to the distal functional component 311 by the transmission ratio approximately one-to-one, thereby ensuring the accuracy of treatment or detection.

[0051] In some embodiments, such as Figure 1 and Figure 2 As shown, in order to perform therapeutic or diagnostic functions in interventional catheters, the handle assembly 2 is typically connected to the catheter controller at the device end. The catheter controller has a drive unit 35, which drives the functional component 311 to rotate and / or move axially within the sheath body 11. The drive shaft 33 transmits the torque or push-pull force from the proximal end of the handle assembly 2 to the functional component 311 at the distal end of the sheath body 11.

[0052] In some embodiments, the drive shaft 33, the force transmission component inside the sheath body 11, is a double or triple helical spring coiled axially. The spring-shaped drive shaft 33 has good torque transmission and compressive strength, and because it is coiled axially, it has high axial elasticity, but correspondingly poor tensile strength.

[0053] In some embodiments of this application, the inner cavity of the sheath body 11 is filled with a liquid medium (preferably oil, which has high flow resistance). The sheath body 11 is a tubing with a closed distal end. The oil has high chemical inertness, which can effectively prevent corrosion or deterioration of the drive shaft and transmission components, enabling the interventional catheter of this application to be reused multiple times.

[0054] In some embodiments, the transmission component 4 is preferably a flexible wire. The flexible wire is made of materials such as nylon, ultra-high molecular weight polyethylene, aramid, nickel-titanium, and stainless steel wire. It has the characteristics of low elasticity and softness, which can provide sufficient tensile force without affecting the flexibility of the sheath body 11. The flexible wire includes a connecting section and an intermediate section. The distal end and proximal end of the flexible wire are both connecting sections. The intermediate section is located between the two connecting sections and is arranged in the hollow part of the helical joint and parallel to the drive shaft 33.

[0055] Furthermore, in some embodiments, such as Figure 9 As shown, multiple helical sections have equal pitches. The far and near ends of the flexible line are connected to the drive shaft. The length of the middle section of the flexible line is L, where L = n * P, and n is the number of helical sections that the middle section spans, and P is the pitch.

[0056] like Figures 5-8 The drive shaft 33 is a hollow shaft. The transmission component 4 is inserted into the hollow part of the drive shaft 33 to avoid friction between the transmission component 4 and the outer wall of the drive shaft 33 or the inner wall of the sheath body 11 when the drive shaft 33 moves inside the sheath body 11, thereby improving the service life of the flexible line 4.

[0057] Meanwhile, the sheath body 11 is filled with a liquid medium, and the transmission component 4 is placed inside the drive shaft 33, which helps to reduce the resistance of the liquid medium to the movement of the transmission component 4.

[0058] In some embodiments, the transmission component 4 is disposed outside the drive shaft 33. During operation, the transmission component 4 is located in the gap between the drive shaft 33 and the inner wall of the sheath body 11, which also falls within the protection scope of this application.

[0059] In some embodiments, the distal and proximal ends of the transmission member 4 are fixed by bonding, welding or knotting.

[0060] In one specific embodiment, the distal end of the transmission member 4 is knotted and then fixedly connected to the base 312 for mounting the functional component 311.

[0061] like Figure 5 As shown, the far end of the transmission component 4 is knotted to increase the contact area between it and the base 312, thereby ensuring a stable connection between the two and preventing them from falling off, thus increasing the service life of the equipment.

[0062] In some embodiments, at least one of the proximal end of the functional component (such as the base 312) or the drive shaft 33 is provided with a mounting groove for holding the knotted transmission component 4, and the mounting groove is filled with fixing adhesive for fixing the knot of the transmission component 4.

[0063] like Figure 5 As shown, a mounting groove is provided at the near end of the base 312, and the wire knot at the far end of the transmission component 4 is placed into the mounting groove and filled with fixing glue, so that the far end of the transmission component 4 and the base 312 become one, thereby ensuring the stable connection between the far end of the transmission component 4 and the base 312.

[0064] In some embodiments, the fixed connection method in which the far end of the transmission component 4 is directly bound to the base 312 is also within the scope of protection of this application.

[0065] In some embodiments, the proximal end of the transmission member 4 is knotted and fixedly connected to the drive unit 35;

[0066] like Figure 6 As shown, the near end of the transmission component 4 is knotted to increase the contact area between it and the drive unit 35, thereby ensuring a stable connection between the two and preventing them from falling off, thus increasing the service life of the equipment.

[0067] In some embodiments, the distal end of the drive unit 35 is provided with a mounting groove for holding the knotted transmission component 4, and the mounting groove is filled with fixing adhesive for fixing the knot of the transmission component 4.

[0068] like Figure 6 As shown, a mounting groove is provided at the far end of the drive unit 35, and the wire knot at the near end of the transmission component 4 is placed into the mounting groove and filled with fixing glue, so that the near end of the transmission component 4 and the drive unit 35 become one, thereby ensuring the stable connection between the near end of the transmission component 4 and the drive unit 35.

[0069] In some embodiments, the fixed connection method in which the transmission component 4 is directly tied to the drive unit 35 at its far end is also within the scope of protection of this application.

[0070] In some embodiments, the distal end of the transmission member 4 is fixedly connected to the distal end of the drive shaft 33 after being wound around it;

[0071] like Figure 7As shown, the distal end of the transmission component 4 is directly fixed to the distal end of the drive shaft 33, thereby indirectly achieving relative fixation between the distal end of the transmission component 4 and the functional component 311; wherein the fixing method includes the transmission component 4 being wrapped and tied to the distal end of the drive shaft 33, or the transmission component 4 and the distal end of the drive shaft 33 being fixed by means of fixing buckles, etc.

[0072] In some embodiments, the distal end of the transmission member 4 is wound around the distal outer wall of the drive shaft 33, and a fixing adhesive is applied at the winding position of the transmission member 4 to fix the distal end of the drive shaft 33 and the winding portion of the transmission member 4.

[0073] After the distal end of the transmission component 4 passes through the hollow part of the drive shaft 33, it is wrapped around the distal end of the drive shaft 33 several times. Then, fixing adhesive is applied to the wrapping position to fix the wrapped transmission component 4 and the distal end of the drive shaft 33 into one piece.

[0074] Alternatively, the transmission component 4 can be arranged outside the drive shaft 33, with its distal end directly wound around and fixed to the distal end of the drive shaft 33 with adhesive, which also falls within the scope of protection of this application.

[0075] In some embodiments, the proximal end of the transmission member 4 is fixedly connected to the proximal end of the drive shaft 33 after being wound around it.

[0076] like Figure 8 As shown, the proximal end of the transmission component 4 is directly fixed to the proximal end of the drive shaft 33, thereby indirectly achieving relative fixation between the proximal end of the transmission component 4 and the drive unit 35; wherein the fixing method includes the transmission component 4 being wrapped and tied to the proximal end of the drive shaft 33, or the transmission component 4 and the proximal end of the drive shaft 33 being fixed by means of fixing buckles, etc.

[0077] In some embodiments, the proximal end of the transmission member 4 is wound around the proximal outer wall of the drive shaft 33, and a fixing adhesive is applied at the winding position of the transmission member 4 to fix the proximal end of the drive shaft 33 and the winding portion of the transmission member 4.

[0078] After the proximal end of the transmission component 4 passes through the hollow part of the drive shaft 33, it is wrapped around the proximal end of the drive shaft 33 several times. Then, fixing adhesive is applied to the wrapping position to fix the wrapped transmission component 4 and the proximal end of the drive shaft 33 into one piece.

[0079] Alternatively, the transmission component 4 can be arranged outside the drive shaft 33, with its proximal end directly wound around it and fixed to the proximal end of the drive shaft 33 with adhesive, which also falls within the scope of protection of this application.

[0080] It is worth noting that regardless of whether the transmission component 4 is arranged inside or outside the drive shaft 33, the length of the axially overlapping part of the transmission component 4 and the drive shaft 33 is consistent. This utilizes the high tensile strength of the transmission component 4 to suppress the axial stretching of the drive shaft 33, thereby ensuring that when the drive unit 35 drives the moving part 31 to move towards the proximal end, the displacement can be transmitted one-to-one.

[0081] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0082] The precise-transmission interventional catheter provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. An intervention catheter with precision drive, characterized in that, include: The sheath body has an inner lumen; A drive shaft comprising a plurality of helical sections connected sequentially along an axial direction, the drive shaft being arranged within the inner cavity of the sheath tube, and the drive shaft being capable of being driven to rotate and / or move relative to the sheath tube body; A functional component for treating or detecting tissue, and the functional component is connected to the distal end of the drive shaft; A transmission component, wherein the transmission component is made of a material with a high elastic modulus, the distal end of the transmission component is fixedly connected to the distal end of the drive shaft and / or a functional component, and the proximal end of the transmission component is fixedly connected to the proximal end of the drive shaft. The transmission component is arranged parallel to the drive shaft, and the transmission component suppresses the increase in the distance between each of the spiral segments and the elongation of each individual spiral segment.

2. The precision steerable interventional catheter of claim 1, wherein, The transmission component is a flexible line, which includes a connecting section and an intermediate section. The far end and the near end of the flexible line are both the connecting section. The intermediate section is located between the two connecting sections and is arranged in the hollow part of the spiral section and parallel to the drive shaft.

3. The precision steerable interventional catheter of claim 2, wherein, The plurality of helical segments have equal pitches, and the distal and proximal ends of the flexible line are connected to the drive shaft. The length of the middle segment of the flexible line is L, where L = n * P, and n is the number of helical segments spanned by the middle segment, and P is the pitch.

4. The precision steerable interventional catheter of claim 2, wherein, The drive shaft or the functional component is provided with a mounting groove, which is used to hold the connecting section of the knotted flexible wire, and the mounting groove is filled with fixing adhesive for fixing the knot of the flexible wire.

5. The precision steerable interventional catheter of claim 1, wherein, It also includes a drive unit, wherein the length of the axial overlap portion between the transmission component and the drive shaft is the same. The drive unit drives the drive shaft and the transmission component to rotate synchronously, and / or the drive unit drives the drive shaft and the transmission component to move synchronously toward the proximal end of the sheath body to retract.

6. The precision steerable interventional catheter of claim 1, wherein, The sheath assembly includes the sheath body and a connecting assembly, the distal end of the connecting assembly being fixed to the proximal end of the sheath body, the connecting assembly having a connecting cavity, the connecting assembly having a push seal extending into the connecting cavity, the proximal end of the drive shaft being rotatable and / or movable relative to the connecting cavity, and the proximal end of the drive shaft slidingly abutting against the push seal.

7. The precision steerable interventional catheter of claim 6, wherein, The connecting assembly, from the distal end to the proximal end, includes a first connector, a second connector, a third connector, a push seal, and a fourth connector in sequence; The first connector is fixedly connected to the proximal end of the sheath body, and the inner cavity of the first connector is coaxial and communicates with the inner cavity of the sheath body. The second connector is fixedly connected to the proximal end of the first connector, and the first part of the push seal is fixedly disposed at the proximal end of the second connector. The second part of the push seal is fixedly disposed at the distal end of the fourth connector. The third connector is a sleeve structure, which respectively wraps around the proximal end of the second connector, the distal end of the fourth connector, and the push seal, and makes the second connector, the fourth connector, and the push seal coaxial.

8. The precision steerable interventional catheter of claim 6, wherein, The sheath assembly also includes a rigid tube sleeved around the proximal end of the drive shaft. The rigid tube has a higher rigidity than the drive shaft, and the outer wall of the rigid tube slides and seals against the inner wall of the push seal.

9. The precision steerable interventional catheter of claim 1, wherein, The inner lumen of the sheath is filled with a chemically inert oil, and the functional component is an ultrasonic probe.

10. The precision steerable interventional catheter of claim 1, wherein, The drive shaft is in the shape of a double-layered helical spring or a triple-layered helical spring.

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