Separable microcatheter and stent conveying system and conveying method

Abstract

The invention provides a separable microcatheter and stent conveying system and method, and belongs to the technical field of neural intervention and vascular intervention. The system comprises a separable micro-catheter which is formed by detachably connecting a near-section micro-catheter (1) and a far-section micro-catheter (2) through a physical clamping structure; the stent conveying system comprises a conveying guide wire (3) and an intravascular stent (4), and the conveying guide wire (3) is provided with an anchoring stent (31) matched with the limiting cavity of the far-section micro catheter (2). The guide wire, the catheter and the stent conveying system are integrated, so that the vascular interventional operation process is obviously optimized. The system adopts a separable microcatheter design and a mechanical anchoring structure, so that a guide wire and a catheter do not need to be exchanged for many times in the operation process, and the number of times of instrument operation is fundamentally reduced. According to the invention, the operation time is shortened, the exposure time of an operator and a patient under X-rays is directly reduced, and the radiation dose is effectively controlled.

Description

Technical Field

[0001] This invention relates to the fields of neurointervention and vascular intervention, specifically to a separable microcatheter and stent delivery system and delivery method. Background Technology

[0002] In current neurointerventional and vascular interventional surgeries, catheter systems and stent delivery are typically designed as separate units. After establishing access via guidewire, multiple devices, including microcatheters and stent delivery systems, are sequentially introduced. Clinical statistics show that a typical intracranial aneurysm embolization procedure requires an average of 3-5 different sizes of catheters and guidewires, making the surgical process complex.

[0003] Existing technology has three major flaws:

[0004] (1) Frequent instrument exchanges: The separate design of the catheter and delivery system leads to the need for multiple instrument exchanges during the operation, which prolongs the operation time;

[0005] (2) Risk of complications: Repeated instrument operations increase the probability of complications such as vasospasm and aortic dissection;

[0006] (3) Heavy economic burden: The use of multiple instruments increases the cost of consumables for a single surgery, which intensifies the pressure on the medical insurance system.

[0007] Therefore, the industry urgently needs an integrated delivery system that requires: reducing the number of instrument exchanges, maintaining the synergy between the catheter system and stent delivery, and reducing operational complexity through structural innovation.

[0008] The separable microcatheter system of the present invention is a solution proposed to address the above-mentioned needs. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by adopting the following technical solution:

[0010] A separable microcatheter and stent delivery system includes: a separable microcatheter, consisting of a proximal microcatheter and a distal microcatheter that are separable and connected by a physical locking structure;

[0011] A stent delivery system includes a delivery guidewire and a vascular stent, wherein the delivery guidewire is provided with an anchoring stent that engages with the limiting lumen of a distal microcatheter.

[0012] It also includes a catheter Luer seat, which is connected to the proximal end of the proximal microcatheter. The proximal microcatheter includes: an inner tube of the proximal microcatheter, a middle thiocarrier of the proximal microcatheter with a thiocarrier connection pin and a gradient groove structure, and an outer tube of the proximal microcatheter.

[0013] Preferably, the groove density of the gradient groove structure of the intermediate hysteresis tube gradually decreases from the far end to the near end, and the stiffness gradually decreases from the near end to the far end.

[0014] The distal microcatheter includes: a limiting lumen, an outer tube of the distal microcatheter, and an inner tube of the distal microcatheter;

[0015] The proximal cavity is equipped with a connecting slot and a limiting imaging ring;

[0016] The distal microcatheter's intermediate sub-tube is equipped with a spiral groove and a core wire fixing seat blade limiting hole;

[0017] The distal guide wire structure includes a variable diameter sheath spring, a developing spring, a variable diameter core wire, and a core wire fixing seat. The developing spring is inside the variable diameter sheath spring and outside the variable diameter core wire. The thick end of the variable diameter core wire is fixed in the fixing hole of the core wire fixing seat and welded. At the farthest point, the variable diameter core wire is welded together with the developing spring and the variable diameter sheath spring to form a smooth hemispherical tip.

[0018] The connecting slot is used to engage with the connecting pin of the hysteresis tube.

[0019] Preferably, the connecting slot has a V-shaped opening and a U-shaped narrowing channel, and the limiting imaging ring forms the limiting end face of the anchor bracket, using the formed step to limit the delivery guide wire.

[0020] The delivery guidewire also includes a core wire, a marking strip, and a support spring. The anchoring bracket is connected to the delivery guidewire via an anchoring bracket fixing ring. The delivery guidewire is further provided with a delivery ring for pushing the vascular stent and a retrieval ring for retracting and adjusting the vascular stent.

[0021] Preferably, the core wire fixing seat is made of nickel-titanium superelastic shape memory alloy and is provided with core wire fixing seat blades that cooperate with the limiting holes of the core wire fixing seat blades.

[0022] More preferably, the pitch of the proximal end of the variable diameter sheath spring is the same as the pitch of the spiral groove of the middle sub-microcatheter, forming a physical interlocking structure.

[0023] Another technical solution of the present invention is a delivery method of the above system, comprising the following steps:

[0024] S1. Deliver the separable microcatheter to the lesion site;

[0025] S2. Introduce the stent system through the introduce sheath;

[0026] S3. Push the anchoring stent into the distal microcatheter limiting lumen;

[0027] S4. Keep the delivery guidewire and distal microcatheter stationary, retract the proximal microcatheter to separate the two microcatheters, and release the vascular stent in situ;

[0028] S5. Keep the delivery guidewire and distal microcatheter stationary, and retract the proximal microcatheter until the vascular stent is fully released.

[0029] Preferably, after step S5, the method further includes:

[0030] S6. Keep the delivery guidewire and distal microcatheter stationary, and push the proximal microcatheter back to engage with the distal microcatheter;

[0031] S7. The entire microcatheter and delivery guidewire can be withdrawn and separated.

[0032] Compared with the prior art, the present invention achieves the following technical effects:

[0033] This invention significantly optimizes the vascular interventional procedure by integrating the guidewire, catheter, and stent delivery system into a single unit. The system employs a detachable microcatheter design and a mechanical anchoring structure, eliminating the need for multiple guidewire and catheter exchanges during the procedure and fundamentally reducing the number of instrument operations. This invention not only shortens the operation time but also directly reduces the exposure time of the surgeon and patient to X-rays, effectively controlling radiation dose.

[0034] This invention significantly reduces the instrument cost per surgical procedure by minimizing the use of expensive consumables such as guidewires. The simplified procedure also reduces the consumption of auxiliary instruments, alleviating the financial burden on patients and reducing the pressure on national health insurance. Attached Figure Description

[0035] For ease of explanation, the present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0036] Figure 1 Schematic diagram of the main structure of the separable microcatheter Figure 1 ;

[0037] Figure 2 Schematic diagram of the main structure of the separable microcatheter Figure 2 ;

[0038] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0039] Figure 4 This is a schematic diagram of the sub-microcatheter structure with a thiopancreatic tube in the middle.

[0040] Figure 5 Diagram of the distal microcatheter structure;

[0041] Figure 6 This is a schematic diagram of the sub-thiosine tube structure in the middle of the distal microcatheter;

[0042] Figure 7 This is a schematic diagram of the core wire fixing seat structure;

[0043] Figure 8 This is a schematic diagram of a variable diameter sheath spring structure;

[0044] Figure 9 This is a schematic diagram of the connection between the proximal and distal microcatheters.

[0045] Figure 10 This is a structural diagram of the conveying system;

[0046] Figure 11 This is a structural diagram of the guide wire;

[0047] Figure 12 A schematic diagram illustrating the delivery system for a vascular stent and the anchoring of the stent to the limiting lumen.

[0048] Figure 13 A schematic diagram showing the riveting of the guidewire to the distal microcatheter after the vascular stent has been deployed.

[0049] Figure 14 This is a schematic diagram of step S1 of the conveying method;

[0050] Figure 15 This is a schematic diagram of step S2 of the conveying method;

[0051] Figure 16 This is a schematic diagram of step S3 of the conveying method;

[0052] Figure 17 This is a schematic diagram of step S4 of the conveying method;

[0053] Figure 18 This is a schematic diagram of step S5 of the conveying method;

[0054] Figure 19 This is a schematic diagram of step S6 of the conveying method;

[0055] Figure 20 This is a schematic diagram of step S7 of the delivery method.

[0056] In the figure: 1-proximal microcatheter, 11-catheter Luer seat, 12-inner cannula of proximal microcatheter, 13-hypotube in the middle of proximal microcatheter, 131-connecting pin, 14-outer cannula of proximal microcatheter, 15-microcatheter junction segment;

[0057] 2-Distal microcatheter, 21-Proximal cavity, 211-Connecting slot, 212-Limiting imaging ring, 213-Anchoring bracket limiting end face, 22-Distal microcatheter intermediate thiopanole tube, 221-Helical groove, 222-Leaf limiting hole, 23-Distal guidewire structure, 231-Variable diameter sheath spring, 232-Illuminating spring, 233-Variable diameter core wire, 24-Core wire fixing seat, 241-Core wire fixing seat blade, 242-Core wire fixing seat fixing hole, 25-Distal microcatheter outer tube, 26-Distal microcatheter inner tube, 27-Limiting cavity;

[0058] 3-Conveyor wire, 31-Anchor bracket, 311-Anchor bracket fixing ring, 32-Conveyor ring, 33-Recovery ring, 34-Inlet sheath, 35-Core wire, 351-Marking tape, 36-Support spring, 37-Non-transparent spring;

[0059] 4-Vascular stents. Detailed Implementation

[0060] The following are specific embodiments of the present invention, in conjunction with the appendix. Figure 1-20 The technical solutions of the present invention will be further described below, but the present invention is not limited to these embodiments; in the following description, specific details such as specific configurations are provided only to help to fully understand the embodiments of the present invention. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention.

[0061] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0062] Example 1

[0063] A separable microcatheter and stent delivery system, such as Figure 12 As shown, it includes: a separable microcatheter, consisting of a proximal microcatheter 1 and a distal microcatheter 2 that are separable and connected by a physical locking structure;

[0064] like Figure 10 As shown, the stent delivery system includes a delivery guidewire 3 and a vascular stent 4. The delivery guidewire 3 is provided with an anchoring stent 31 that cooperates with the limiting lumen of the distal microcatheter 2.

[0065] like Figure 1-2 As shown, it also includes a catheter Luer seat 11, which is connected to the proximal end of the proximal microcatheter 1, as shown. Figure 3-4 As shown, the proximal microcatheter 1 includes: an inner tube 12, a middle thiocyanate tube 13 with a thiocyanate tube connection pin 131 and a gradient groove structure, and an outer tube 14. The groove density of the gradient groove structure of the middle thiocyanate tube 13 gradually decreases from the distal end to the proximal end, and the stiffness gradually decreases from the proximal end to the distal end.

[0066] like Figure 5 As shown, the distal microcatheter 2 includes: a limiting lumen 27, an outer tube 25 of the distal microcatheter, and an inner tube 26 of the distal microcatheter;

[0067] like Figure 6 As shown, the proximal cavity 21 is provided with a connecting slot 211 and a limiting imaging ring 212;

[0068] The intermediate submersible tube 22 of the distal microcatheter is provided with a spiral groove 221 and a core wire fixing seat blade limiting hole 222;

[0069] The distal guide wire structure 23 includes a variable diameter sheath spring 231, a developing spring 232, a variable diameter core wire 233, and a core wire fixing seat. The developing spring 232 is inside the variable diameter sheath spring 231 and outside the variable diameter core wire 233. The thick end of the variable diameter core wire 233 is fixed and welded in the fixing hole 242 of the core wire fixing seat. At the farthest point, the variable diameter core wire 233 is welded together with the developing spring 232 and the variable diameter sheath spring 231 to form a smooth hemispherical tip.

[0070] like Figure 9 As shown, the connecting slot 211 is used to engage with the connecting pin 131 of the hyaluronic acid tube. The diameter of the connecting pin is slightly larger than the U-shaped narrowing channel of the connecting slot, and a certain force is required to separate the proximal and distal microcatheters.

[0071] Preferably, the connecting slot 211 has a V-shaped opening and a U-shaped narrowing channel, and the limiting imaging ring 212 forms the limiting end face of the anchor bracket, using the formed step to limit the delivery guide wire.

[0072] like Figure 10-11 As shown, the delivery guide wire 3 also includes a core wire 35, a marking strip 351, and a support spring 36. The anchoring bracket 31 is connected to the delivery guide wire 3 through an anchoring bracket fixing ring 311. The delivery guide wire 3 is also provided with a delivery ring 32 for pushing the vascular stent and a retrieval ring 33 for adjusting the retraction of the vascular stent.

[0073] Preferably, the core wire fixing seat 24 is made of nickel-titanium superelastic shape memory alloy and is provided with core wire fixing seat blades 241 that cooperate with the core wire fixing seat blade limiting hole 222. The core wire fixing seat blades are embedded in the core wire fixing seat blade limiting hole to achieve connection.

[0074] More preferably, the pitch of the proximal end of the variable diameter sheath spring 231 is the same as the pitch of the helical groove 221 of the distal microcatheter 22, forming a physical interlocking structure and improving the connection strength.

[0075] like Figure 12 As shown, after the anchoring stent is delivered to the limiting cavity, because the diameter of the limiting cavity is larger than the inner diameter of the limiting imaging ring, the proximal end of the anchoring stent will engage at the limiting end face of the anchoring stent after it opens. At this time, keeping the delivery guidewire and distal microcatheter stationary, the proximal microcatheter is withdrawn, and the vascular stent is released in situ. After the proximal microcatheter is removed, the delivery guidewire is connected to the distal microcatheter through the anchoring stent to form a single unit (e.g., Figure 13 (As shown).

[0076] Example 2

[0077] like Figure 14-20 As shown, the delivery method of the separable microcatheter and stent delivery system includes the following steps:

[0078] S1. Deliver the separable microcatheter to the lesion site;

[0079] S2. Introduce the stent system through the introduce sheath;

[0080] S3. Push the anchoring stent (31) into the distal microcatheter limiting lumen;

[0081] S4. Keep the delivery guidewire (3) and distal microcatheter (2) stationary, retract the proximal microcatheter (1) to separate the two microcatheters, and release the vascular stent in situ;

[0082] S5. Keep the delivery guidewire (3) and distal microcatheter (2) stationary, and retract the proximal microcatheter (1) until the vascular stent is fully released.

[0083] Preferably, after step S5, the method further includes:

[0084] S6. Keep the delivery guidewire and distal microcatheter stationary, and push the proximal microcatheter (1) back into contact with the distal microcatheter (2);

[0085] S7. The entire microcatheter and delivery guidewire can be withdrawn (3).

[0086] Those skilled in the art to which this application pertains may make various modifications or additions to the specific embodiments described, or adopt similar methods to replace them, without departing from the inventive concept of this application or exceeding the scope defined by the appended claims.

Claims

1. A separable microcatheter and stent delivery system, characterized in that, include: Separable microcatheter, consisting of a proximal microcatheter (1) and a distal microcatheter (2) that can be separably connected by a physical locking structure; The stent delivery system includes a delivery guidewire (3) and a vascular stent (4), wherein the delivery guidewire (3) is provided with an anchoring stent (31) that cooperates with the limiting lumen of the distal microcatheter (2).

2. The system according to claim 1, characterized in that, It also includes a catheter Luer seat (11), which is connected to the proximal end of the proximal microcatheter (1), the proximal microcatheter (1) comprising: The proximal microcatheter inner tube (12), the proximal microcatheter middle hyaluronic acid tube (13) are provided with a hyaluronic acid tube connecting pin (131) and a gradient groove structure, and the proximal microcatheter outer tube (14).

3. The system according to claim 2, characterized in that, The groove density of the gradient groove structure of the intermediate hysteresis tube (13) gradually decreases from the far end to the near end, and the stiffness gradually decreases from the near end to the far end.

4. The system according to claim 1, characterized in that, The distal microcatheter (2) includes: a limiting lumen, an outer tube of the distal microcatheter, and an inner tube of the distal microcatheter; The proximal cavity (21) is provided with a connecting slot (211) and a limiting imaging ring (212); The distal microcatheter's intermediate submersible tube (22) is provided with a spiral groove (221) and a core wire fixing seat blade limiting hole (222); The distal guide wire structure (23) includes a variable diameter sheath spring (231), a developing spring (232), a variable diameter core wire, and a core wire fixing seat. The developing spring is inside the variable diameter sheath spring and outside the variable diameter core wire. The thick end of the variable diameter core wire is fixed in the fixing hole of the core wire fixing seat and welded. At the farthest point, the variable diameter core wire is welded together with the developing spring and the variable diameter sheath spring to form a smooth hemispherical tip. The connecting slot (211) is used to engage with the hysteresis tube connecting pin (131).

5. The system according to claim 4, characterized in that, The connecting slot (211) has a V-shaped opening and a U-shaped narrowing channel, and the limiting imaging ring (212) forms the limiting end face of the anchor bracket, using the formed step to limit the delivery guide wire.

6. The system according to claim 1, characterized in that, The delivery guide wire (3) also includes a core wire, a marking strip, and a support spring. The anchoring bracket (31) is connected to the delivery guide wire (3) through the anchoring bracket fixing ring (311). The delivery guide wire (3) is also provided with a delivery ring (32) for pushing the vascular stent and a retrieval ring (33) for adjusting the vascular stent retraction.

7. The system according to claim 1, characterized in that, The core wire fixing seat (24) is made of nickel-titanium superelastic shape memory alloy and has a core wire fixing seat blade (241) that cooperates with the core wire fixing seat blade limiting hole (222).

8. The system according to claim 1, characterized in that, The pitch of the near end of the variable diameter sheath spring (231) is the same as the pitch of the spiral groove (221) of the middle sub-microcatheter (22) of the distal microcatheter, forming a physical interlocking structure.

9. The conveying method of the system according to any one of claims 1-8, characterized in that, Including the following steps: S1. Deliver the separable microcatheter to the lesion site; S2. Introduce the stent system through the introduce sheath; S3. Push the anchoring stent (31) into the distal microcatheter limiting lumen; S4. Keep the delivery guidewire (3) and distal microcatheter (2) stationary, retract the proximal microcatheter (1) to separate the two microcatheters, and release the vascular stent in situ; S5. Keep the delivery guidewire (3) and distal microcatheter (2) stationary, and retract the proximal microcatheter (1) until the vascular stent is fully released.

10. The method according to claim 9, characterized in that, The process after step S5 also includes: S6. Keep the delivery guidewire and distal microcatheter stationary, and push the proximal microcatheter (1) back into contact with the distal microcatheter (2); S7. The entire microcatheter and delivery guidewire can be withdrawn (3).

Images