Bending control structure of microcatheter

Abstract

The utility model discloses a bending control structure of a microcatheter, which comprises a handle, a catheter and a bending control structure, one end of the catheter is fixedly connected with the handle, the handle controls and adjusts bending of the catheter through the bending control structure, and the bending control structure comprises a driving piece, a first sliding piece and a second sliding piece, transmission structures are arranged between the driving part and the first sliding part and between the driving part and the second sliding part, the first sliding part is connected to the two sides of the guide pipe through a first traction wire, the second sliding part is connected to the two sides of the guide pipe through a second traction wire, and the driving part drives the first sliding part and the second sliding part to be relatively close to or away from each other through the transmission structures. And the catheter is pulled to be bent through the first traction wire and the second traction wire. The utility model has the following advantages and effects: the scheme utilizes a new mechanical structure, and has the effects of convenient operation and high operation precision.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a bending control structure for a micro catheter. Background Art

[0002] Interventional therapy is a minimally invasive treatment using modern high-tech means. Under the guidance of medical imaging equipment, special catheters, guide wires and other precision medical devices are introduced into the human body for establishing access, delivering instruments or drugs, etc.

[0003] The existing Chinese patent with the publication number of CN211560260U discloses a segmented adjustable-bending micro catheter, which includes a catheter body and a traction mechanism. The catheter body includes an inner membrane tube, a first reinforcing layer and a second reinforcing layer sleeved outside the inner membrane tube, and an outer layer that wraps and fuses the inner membrane tube, the first reinforcing layer and the second reinforcing layer; the distal end of the catheter body is an adjustable-bending section, and the rest is the main body section; the first reinforcing layer extends axially corresponding to the adjustable-bending section, the second reinforcing layer extends axially corresponding to the main body section, and the stiffness of the second reinforcing layer is greater than that of the first reinforcing layer.

[0004] However, the above adjustable-bending micro catheter has the following disadvantages: Although the micro catheter can control the bending of the adjustable-bending section of the catheter, the bending amplitude of its adjustable-bending section cannot be accurately adjusted, and the maneuverability and operation accuracy are poor. Content of the Utility Model

[0005] The purpose of the utility model is to provide a bending control structure for a micro catheter, which has the effects of convenient operation and high operation accuracy.

[0006] The above technical purpose of the utility model is achieved through the following technical solutions: A bending control structure for a micro catheter includes a handle, a catheter and a bending control structure arranged in the handle. One end of the catheter is fixedly connected to the handle, and the handle controls and adjusts the bending of the catheter through the bending control structure. The bending control structure includes a driving member, a first sliding member and a second sliding member slidably arranged on the handle. A transmission structure is arranged between the driving member and the first sliding member and the second sliding member. The first sliding member is connected to both sides of the catheter through a first traction wire, and the second sliding member is connected to both sides of the catheter through a second traction wire. The driving member drives the first sliding member and the second sliding member to move relatively closer or farther away through the transmission structure, and pulls the catheter to bend through the first traction wire and the second traction wire.

[0007] By adopting the above technical solution, when the operator needs to bend the catheter, by means of the transmission action of the driving member and the transmission structure, the first sliding member and the second sliding member are driven to move relatively away from or close to each other, thereby driving one of the first traction wire and the second traction wire to be in a tension state and the other to be in a slack state, so that the catheter bends towards the side in the tension state. The operator can drive the first sliding member and the second sliding member to move simultaneously by controlling the driving member under the action of the transmission structure, realizing the relative approach or separation of the first sliding member and the second sliding member, and further driving the first traction wire and the second traction wire to switch between the tension state and the slack state. When the first traction wire and the second traction wire are at the balance point, the traction forces on both sides of the catheter cancel each other out, and the catheter is in a straight state, enabling the operator to output an appropriate adjustment force and precisely control the bending amplitude of the catheter through the bending control structure, with the effects of convenient operation and high operation accuracy.

[0008] The further setting of the present utility model is: the transmission structure includes a screw rod and threaded holes, the threaded holes are opened on the corresponding first sliding member and second sliding member, both ends of the screw rod are respectively provided with a positive threaded rod portion and a reverse threaded rod portion, the threaded hole of the first sliding member is in threaded cooperation with the positive threaded rod portion, and the threaded hole of the second sliding member is in threaded cooperation with the reverse threaded rod portion.

[0009] By adopting the above technical solution, the operator drives the screw rod to rotate through the driving member. Under the threaded action between the positive threaded rod portion and the reverse threaded rod portion of the screw rod and the corresponding threaded holes on the first sliding member and the second sliding member, the first sliding member and the second sliding member can be driven to approach or separate from each other by one component of the screw rod, making the structure of the present utility model more compact.

[0010] The further setting of the present utility model is: both the first sliding member and the second sliding member include a sliding portion and a threaded mating portion, the threaded holes are opened on the corresponding threaded mating portions of the first sliding member and the second sliding member, and one ends of the first traction wire and the second traction wire close to the handle are fixedly connected to the corresponding sliding portions of the first sliding member and the second sliding member.

[0011] The further setting of the present utility model is: a solid tube portion is extended and provided at one end of the catheter close to the handle, the first sliding member and the second sliding member are provided with through holes corresponding to the solid tube portion, and the solid tube portion passes through the first sliding member and the second sliding member through the through holes and is fixedly connected to the handle.

[0012] By adopting the above technical solution, the solid tube portion can slide through the first sliding member and the second sliding member through the through holes, saving the installation space of the solid tube portion.

[0013] The utility model is further configured as follows: the driving member is configured as a knob coaxially fixed to the screw rod, the handle is provided with an avoidance groove and a sliding cavity, the first sliding member and the second sliding member are slidably arranged in the sliding cavity, and the knob extends out of the handle through the avoidance groove.

[0014] By adopting the above technical solution, the operator can drive the screw to rotate by turning the knob, and then use the thread of the screw to cooperate with the threaded hole to drive the first sliding member and the second sliding member to move closer or farther away from each other.

[0015] The utility model is further configured as follows: the catheter comprises a flexible bending section and a supporting section, the first traction wire and the second traction wire are movably arranged in the supporting section and are connected to both sides of the flexible bending section, and the handle adjusts the bending of the flexible bending section relative to the supporting section through the bending control structure.

[0016] The utility model is further configured as follows: the support section includes an inner tube, a braided tube, a PTFE layer and an outer hydrophilic tube from inside to outside, and the first traction wire and the second traction wire are movably arranged between the inner tube and the braided tube.

[0017] By adopting the above technical solution, the outer hydrophilic tube has good hydrophilicity, which can reduce the friction between the catheter and the blood vessel, facilitate the pushing of the catheter, and is not easy to damage the blood vessel. The PTFE layer has a smaller friction coefficient, and the braided layer has excellent anti-kink ability, which improves the support of the present invention, thereby ensuring the integrity of the catheter lumen. The PTFE layer has a smaller friction coefficient, so that the first traction wire and the second traction wire can flexibly slide between the inner tube and the braided tube.

[0018] The utility model is further configured as follows: a quick exchange port for inserting a guide wire is formed through the side wall of the catheter, and a guide wire insertion channel connected to the quick exchange port is formed through the handle.

[0019] By adopting the above technical solution, the guide wire insertion channel can facilitate the guide wire to penetrate into the rapid exchange port, and quickly penetrate into the catheter through the rapid exchange port, thereby increasing the speed of the guide wire penetrating the catheter and saving operation time.

[0020] In summary, the utility model has the following beneficial effects:

[0021] By setting a bending control structure in the handle, fixing the tail of the catheter on the handle, driving the coaxial screw to rotate through the knob, and then under the thread action between the positive threaded rod part and the reverse threaded rod part of the screw and the corresponding threaded holes on the first sliding part and the second sliding part, one component of the screw can drive the first sliding part and the second sliding part to approach or move away from each other. Furthermore, one of the first traction wire and the second traction wire is in a tensioned state and the other is in a relaxed state, so that the catheter bends towards the side in the tensioned state. When the first traction wire and the second traction wire are at the balance point, the traction forces on both sides of the catheter cancel each other out, and the catheter is in a straight state. This enables the operator to output an appropriate adjustment force and precisely control the bending amplitude of the catheter through the bending control structure, achieving the effects of convenient operation and high operation precision. Brief Description of the Drawings

[0022] Figure 1 is the structural diagram of the present utility model.

[0023] Figure 2 is the longitudinal sectional view of the present utility model.

[0024] Figure 3 is the connection diagram of the bending control structure and the catheter of the present utility model.

[0025] Figure 4 is the structural diagram of the support section of the catheter of the present utility model.

[0026] In the figure: 1. Handle; 1a. Sliding cavity; 1b. Guide wire threading channel; 1c. Avoidance groove; 2. Catheter; 2a. Rapid exchange port; 21. Support section; 211. Inner layer tube; 212. Braided layer tube; 213. PTFE layer; 214. Outer hydrophilic tube; 22. Flexible bending section; 23. Solid tube part; 3. Bending control structure; 3a. Through hole; 31. First sliding part; 311. Sliding part; 312. Thread mating part; 312a. Threaded hole; 32. Second sliding part; 331. First traction wire; 332. Second traction wire; 34. Screw; 341. Positive threaded rod part; 342. Reverse threaded rod part; 35. Knob. Detailed Description of the Preferred Embodiment

[0027] The present utility model will be further described below with reference to the accompanying drawings.

[0028] A bending control structure for a micro catheter, as Figures 1-3As shown in the figure, it includes a handle 1, a catheter 2, and a bending control structure 3 disposed in the handle 1. One end of the catheter 2 is fixedly connected to the handle 1. The handle 1 controls and adjusts the bending of the catheter 2 through the bending control structure 3. The bending control structure 3 includes a driving member, a first sliding member 31 and a second sliding member 32 slidably disposed on the handle 1. A transmission structure is provided between the driving member and the first sliding member 31 and the second sliding member 32. The first sliding member 31 is connected to both sides of the catheter 2 through a first traction wire 331, and the second sliding member 32 is connected to both sides of the catheter 2 through a second traction wire 332. The driving member drives the first sliding member 31 and the second sliding member 32 to move relatively closer to or away from each other along the length extension direction of the catheter 2 through the transmission structure, and pulls the catheter 2 to bend through the first traction wire 331 and the second traction wire 332. A rapid exchange port 2a for inserting a guide wire is formed through the side wall of the catheter 2, and a guide wire threading channel 1b communicating with the rapid exchange port 2a is formed through the handle 1. The guide wire threading channel 1b can facilitate the guiding and insertion of the guide wire into the rapid exchange port 2a, and quickly insert the guide wire into the catheter 2 through the rapid exchange port 2a, improving the speed of inserting the guide wire into the catheter 2 and saving the operation time.

[0029] As Figures 2-4As shown, the transmission structure includes a screw rod 34 and a threaded hole 312a, the threaded hole 312a is provided on the corresponding first sliding member 31 and the second sliding member 32, and the two ends of the screw rod 34 are respectively provided with a positive thread rod portion 341 and a reverse thread rod portion 342, the threaded hole 312a of the first sliding member 31 is threadedly matched with the positive thread rod portion 341, and the threaded hole 312a of the second sliding member 32 is threadedly matched with the reverse thread rod portion 342. The driving member in this embodiment is configured as a knob 35 coaxially fixed to the screw rod 34, and the handle 1 is provided with an avoidance groove 1c and a sliding cavity 1a. The first sliding member 31 and the second sliding member 32 are slidably arranged in the sliding cavity 1a, and the knob 35 extends out of the handle 1 through the avoidance groove 1c. The operator can drive the screw rod 34 to rotate by turning the knob 35, and then utilize the threaded match between the screw rod 34 and the corresponding threaded hole 312a to drive the first sliding member 31 and the second sliding member through the screw 34. 32 are relatively close or far away, making the structure of the utility model more compact; the first sliding member 31 and the second sliding member 32 both include a sliding portion 311 and a threaded matching portion 312, and the threaded hole 312a is opened on the threaded matching portion 312 corresponding to the first sliding member 31 and the second sliding member 32, and the first traction wire 331 and the second traction wire 332 are fixedly connected to the sliding portion 311 corresponding to the first sliding member 31 and the second sliding member 32 at one end close to the handle 1; a solid tube portion 23 is extended from one end of the catheter 2 close to the handle 1, and the first sliding member 31 and the second sliding member 32 are opened with a through hole 3a corresponding to the solid tube portion 23, and the solid tube portion 23 passes through the first sliding member 31 and the second sliding member 32 through the through hole 3a and is fixedly connected to the handle 1, and the solid tube portion 23 can be slidably penetrated on the first sliding member 31 and the second sliding member 32 through the through hole 3a, saving the installation space of the solid tube portion 23.

[0030] like Figures 3-4 As shown, the catheter 2 includes a flexible bending section 22 and a support section 21, a first traction wire 331 and a second traction wire 332 are movably arranged in the support section 21 and connected to both sides of the flexible bending section 22, and the handle 1 adjusts the bending of the flexible bending section 22 relative to the support section 21 through the bending control structure 3; the support section 21 includes an inner tube 211, a braided tube 212, a PTFE layer 213 and an outer hydrophilic tube 214 from the inside to the outside, and the first traction wire 331 and the second traction wire 332 are movably arranged in the inner tube 211 and the braided tube 2 12, the outer hydrophilic tube 214 has good hydrophilicity, which can reduce the friction between the catheter 2 and the blood vessel, facilitate the pushing of the catheter 2, and is not easy to damage the blood vessel. The PTFE layer 213 has a smaller friction coefficient, and the braided layer has excellent anti-kink ability, which improves the support of the present invention, thereby ensuring the integrity of the inner cavity of the catheter 2. The PTFE layer 213 has a smaller friction coefficient, so that the first traction wire 331 and the second traction wire 332 can flexibly slide between the inner tube 211 and the braided layer tube 212.

[0031] The basic working principle of the present utility model is as follows: when the operator needs to bend the catheter 2, turning the knob 35 drives the screw 34 to rotate. By using the thread fit between the positive thread rod portion 341 and the reverse thread rod portion 342 of the screw 34 and the corresponding threaded holes 312a on the first sliding member 31 and the second sliding member 32, driving the first sliding member 31 and the second sliding member 32 to approach or move away from each other by turning the driving member. Furthermore, one of the first traction wire 331 and the second traction wire 332 is in a tension state and the other is in a slack state, so that the catheter 2 bends towards the side in the tension state. And when the first traction wire 331 and the second traction wire 332 are at the balance point, the traction forces on both sides of the catheter 2 cancel each other out, and the catheter 2 is in a straight state. This enables the operator to output an appropriate adjustment force and precisely control the bending amplitude of the catheter 2 through the bending control structure 3, with the effects of convenient operation and high operation precision.

[0032] The above description is only a preferred embodiment of the present utility model. Therefore, any equivalent changes or modifications made according to the structures, features, and principles described in the scope of the patent application of the present utility model are included in the scope of the patent application of the present utility model.

Claims

1. A micro-catheter bending control structure, comprising a handle (1), a catheter (2) and a bending control structure (3) arranged in the handle (1), wherein one end of the catheter (2) is fixedly connected to the handle (1), and the handle (1) controls and adjusts the bending of the catheter (2) through the bending control structure (3), characterized in that: The bending control structure (3) comprises a driving member and a first sliding member (31) and a second sliding member (32) slidably arranged on the handle (1); a transmission structure is arranged between the driving member and the first sliding member (31) and the second sliding member (32); the first sliding member (31) is connected to both sides of the catheter (2) via a first traction wire (331) and the second sliding member (32) is connected to both sides of the catheter (2) via a second traction wire (332); the driving member drives the first sliding member (31) and the second sliding member (32) to move relatively closer or farther away from each other via the transmission structure, and pulls the catheter (2) to bend via the first traction wire (331) and the second traction wire (332).

2. The microcatheter bending control structure according to claim 1, characterized in that: The transmission structure comprises a screw rod (34) and a threaded hole (312a); the threaded hole (312a) is provided on the first sliding member (31) and the second sliding member (32); the two ends of the screw rod (34) are respectively provided with a positive threaded rod portion (341) and a negative threaded rod portion (342); the threaded hole (312a) of the first sliding member (31) is threadedly matched with the positive threaded rod portion (341); the threaded hole (312a) of the second sliding member (32) is threadedly matched with the negative threaded rod portion (342).

3. The micro-catheter bending control structure according to claim 2, characterized in that: The first sliding member (31) and the second sliding member (32) both comprise a sliding portion (311) and a threaded matching portion (312); the threaded hole (312a) is provided on the threaded matching portion (312) corresponding to the first sliding member (31) and the second sliding member (32); one end of the first traction wire (331) and the second traction wire (332) close to the handle (1) is fixedly connected to the sliding portion (311) corresponding to the first sliding member (31) and the second sliding member (32).

4. The microcatheter bending control structure according to claim 1, characterized in that: A solid tube portion (23) is extended from one end of the catheter (2) close to the handle (1); the first sliding member (31) and the second sliding member (32) are provided with through holes (3a) corresponding to the solid tube portion (23); the solid tube portion (23) passes through the first sliding member (31) and the second sliding member (32) through the through holes (3a) and is fixedly connected to the handle (1).

5. The micro-catheter bending control structure according to claim 2, characterized in that: The driving member is configured as a knob (35) coaxially fixed to the screw rod (34); the handle (1) is provided with an avoidance groove (1c) and a sliding cavity (1a); the first sliding member (31) and the second sliding member (32) are slidably arranged in the sliding cavity (1a); and the knob (35) extends out of the handle (1) through the avoidance groove (1c).

6. The micro-catheter bending control structure according to claim 1, characterized in that: The catheter (2) comprises a flexible bending section (22) and a supporting section (21); the first traction wire (331) and the second traction wire (332) are movably arranged in the supporting section (21) and are connected to both sides of the flexible bending section (22); the handle (1) adjusts the bending of the flexible bending section (22) relative to the supporting section (21) through the bending control structure (3).

7. The micro-catheter bending control structure according to claim 6, characterized in that: The support section (21) comprises, from the inside to the outside, an inner tube (211), a braided tube (212), a PTFE layer (213) and an outer hydrophilic tube (214), and the first traction wire (331) and the second traction wire (332) are movably arranged between the inner tube (211) and the braided tube (212).

8. The microcatheter bending control structure according to claim 1, characterized in that: The side wall of the catheter (2) is penetrated by a quick exchange port (2a) for inserting a guide wire, and the handle (1) is penetrated by a guide wire insertion channel (1b) connected to the quick exchange port (2a).

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