Intracorporeal interventional catheter mechanism, stent delivery device and method of manufacture

Abstract

This invention belongs to the field of medical device technology, and specifically relates to an in vivo interventional catheter mechanism, a stent delivery device, and a manufacturing method. The in vivo interventional catheter mechanism includes a sheath core and an auxiliary tube. An annular space is provided between the inner wall of the auxiliary tube and the outer wall of the sheath core, and a blocking element is disposed within the annular space. The auxiliary tube is bonded to the distal end of the sheath core with adhesive, and the blocking element is used to confine the adhesive within the annular space. In this invention, the blocking element can prevent adhesive leakage, accumulation, or areas without adhesive in the annular space, ensuring the stability and bonding strength of the auxiliary tube bonded to the sheath core.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and in particular relates to an in vivo interventional catheter mechanism, a stent delivery device, and a manufacturing method. Background Technology

[0002] Inserting a stent into the lesion site in a patient's body via a body cavity is a common interventional procedure. For example, stents are implanted in coronary arteries, peripheral arteries, veins, etc., to treat vascular stenosis, or a endovascular stent graft is implanted in the aorta to treat arterial dissection. Depending on the actual needs, the stent can also be loaded with drugs to achieve better treatment results.

[0003] The stent needs to be implanted into the patient's body with the help of a catheter assembly. The catheter assembly usually includes a sheath core tube, an auxiliary tube sleeved at the distal end of the sheath core tube, and a guide tube sleeved at the auxiliary tube. The auxiliary tube is used to strengthen the connection between the guide tube and the sheath core tube. The guide tube has greater flexibility. During the process of pushing the guide tube into the human blood vessel, the guide tube can pass through tortuous blood vessel parts, ensuring the smooth deployment of the guide tube to the target blood vessel site.

[0004] The auxiliary tube is usually glued to the distal end of the sheath core tube. Since the glue is a liquid before curing, such as... Figure 10 As shown, due to gravity, the glue will accumulate at the bottom, resulting in glue misalignment (the bold black lines in the diagram indicate the glue). This causes a glue-free section at the top of the sheath core tube and auxiliary tube, leading to low bonding strength between the auxiliary tube and the sheath core tube. Additionally, when the auxiliary tube and sheath core tube are fitted together, if... Figure 11 As shown, due to gravity, the auxiliary tube and the sheath core tube become eccentric and their bottoms are stuck together. When glue is injected between the auxiliary tube and the sheath core tube, less glue enters the bottom of the auxiliary tube and the sheath core tube, resulting in low bonding strength between the auxiliary tube and the sheath core tube. Summary of the Invention

[0005] This invention addresses the technical problem of low bonding strength between the auxiliary tube and the sheath core tube in the prior art by providing an in vivo interventional catheter mechanism, a stent delivery device, and a manufacturing method.

[0006] In view of the above technical problems, embodiments of the present invention provide an in vivo interventional catheter mechanism, including a sheath core tube and an auxiliary tube, wherein the auxiliary tube is sleeved on the sheath core tube, and an annular space is provided between the inner wall of the auxiliary tube and the outer wall of the sheath core tube, and a blocking member is provided in the annular space; the auxiliary tube is glued to the distal end of the sheath core tube by adhesive, and the blocking member is used to restrict the adhesive in the annular space.

[0007] Optionally, the blocking member includes an annular protrusion disposed on the inner wall of the auxiliary tube facing the proximal end of the sheath core tube, and the annular protrusion abuts against the outer wall of the sheath core tube.

[0008] Optionally, the blocking member includes a plurality of axial protrusions circumferentially spaced on the inner wall of the auxiliary tube, the axial protrusions extending axially along the auxiliary tube and abutting against the outer wall of the sheath core tube, the axial protrusions being used to divide the annular space into a plurality of liquid storage spaces.

[0009] Optionally, the blocking member is a hollow frame structure, including multiple support plates and a first fixing ring and a second fixing ring arranged coaxially. The opposite ends of the support plates are respectively connected to the first fixing ring and the second fixing ring. The first fixing ring and the second fixing ring are both sleeved on the sheath core tube. The multiple support plates are respectively spaced apart along the circumference of the first fixing ring and the second fixing ring. The support plates are used to divide the annular space into multiple liquid storage spaces.

[0010] Optionally, the inner walls of the first fixing ring, the second fixing ring, and the support plate are all attached to and bonded to the outer wall of the sheath core tube; the outer walls of the first fixing ring, the second fixing ring, and the support plate are all attached to and bonded to the inner wall of the auxiliary tube.

[0011] An adhesive layer is provided in the accommodating space between two adjacent support plates, and the inner wall of the auxiliary tube and the outer wall of the sheath core tube are respectively bonded to the opposite sides of the adhesive layer.

[0012] Optionally, the auxiliary tube includes a first tapered tube section and a first straight tube section arranged coaxially, with the outer diameter of the first tapered tube section gradually increasing from the proximal end of the sheath core tube toward the distal end of the sheath core tube;

[0013] Wherein, the blocking member is disposed on the inner wall of the first tapered tube section and protrudes around the proximal end of the first tapered tube section; or,

[0014] The blocking member is disposed on the inner wall of the first tapered pipe section and the first straight pipe section, and extends and protrudes along the axial direction of the first tapered pipe section and the first straight pipe section; or,

[0015] The blocking element is disposed between the first tapered tube section and the first straight tube section and the sheath core tube, and the blocking element is a hollow frame structure.

[0016] Optionally, the two ends of the blocking member are flush with the two ends of the auxiliary tube.

[0017] Another embodiment of the present invention provides a stent delivery device, including an outer sheath and the above-described in vivo interventional catheter mechanism; the outer sheath is sleeved on the sheath core tube and the auxiliary tube.

[0018] Another embodiment of the present invention also provides a method for manufacturing the above-described in vivo interventional catheter mechanism, the method comprising:

[0019] The auxiliary tube is fitted onto the sheath core tube;

[0020] The adhesive is filled into the annular space so that the auxiliary tube is bonded to the distal end of the sheath core tube by the adhesive.

[0021] Optionally, filling the annular space with glue to bond the auxiliary tube to the distal end of the sheath core tube via the glue includes:

[0022] After erecting the sheath core tube and the auxiliary tube along the axial direction of the sheath core tube, glue is filled into the annular space. After the glue cures, the auxiliary tube is fixedly sleeved onto the distal end of the sheath core tube; or,

[0023] First, fill the outer wall of the sheath core tube with glue, then fit the blocking element onto the glued outer wall of the sheath core tube, and place the conduit mechanism flat to allow the glue to cure; or,

[0024] First, fill the outer wall of the sheath core tube with glue, then put the blocking element on the outer wall of the sheath core tube with glue, then fill the outer wall of the blocking element with glue, then put the auxiliary tube on the outer wall of the blocking element with glue, and then place the conduit mechanism flat to allow the glue to cure.

[0025] In this invention, an annular space is provided between the inner wall of the auxiliary tube and the outer wall of the sheath core tube, and a blocking element is provided in the annular space; the auxiliary tube is bonded to the distal end of the sheath core tube with adhesive, and the blocking element is used to confine the adhesive in the annular space; the blocking element can divide the annular space into multiple small spaces, each of which can store adhesive; the blocking element can also seal the annular space to prevent the adhesive from leaking; the blocking element can prevent the adhesive from leaking, accumulating, or leaving areas without adhesive in the annular space, thus ensuring the stability and bonding strength of the auxiliary tube bonded to the sheath core tube. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Figure 1 This is a front view of the in vivo interventional catheter mechanism provided in the first embodiment of the present invention;

[0028] Figure 2 This is a circumferential sectional view of the in vivo interventional catheter mechanism provided in the first embodiment of the present invention;

[0029] Figure 3 This is a split perspective view of the in vivo interventional catheter mechanism provided in the second embodiment of the present invention;

[0030] Figure 4 This is a radial cross-sectional view of the in vivo interventional catheter mechanism provided in the second embodiment of the present invention;

[0031] Figure 5 This is a split schematic diagram of the in vivo interventional catheter mechanism provided in the third embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the blocking component of the in vivo interventional catheter mechanism provided in the third embodiment of the present invention;

[0033] Figure 7 This is a radial sectional view of the in vivo interventional catheter mechanism provided in the third embodiment of the present invention;

[0034] Figure 8 This is a front view of the in vivo interventional catheter mechanism after the guide tube is assembled according to an embodiment of the present invention;

[0035] Figure 9 This is an axial sectional view of the in vivo interventional catheter mechanism after the guide tube is assembled, according to an embodiment of the present invention;

[0036] Figure 10 This is a cross-sectional view of the sheath core tube and auxiliary tube being connected in the prior art;

[0037] Figure 11 This is a cross-sectional view of the sheath core tube and auxiliary tube being connected in the existing technology.

[0038] The reference numerals in the accompanying drawings are as follows:

[0039] 1. Sheath core tube; 2. Auxiliary tube; 21. Blocking component; 211. Annular protrusion; 212. Axial protrusion; 213. Support plate; 214. First fixing ring; 215. Second fixing ring; 22. Annular space; 221. Liquid storage space; 23. First conical tube section; 24. First straight tube section; 241. Helical tooth; 3. Guide tube; 31. Flow guiding groove; 311. First groove; 312. Second groove; 313. Third groove; 32. Second conical tube section; 33. Second straight tube section; 34. Third conical tube section. Detailed Implementation

[0040] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0041] It should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "middle," "proximal," and "distal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of the present invention. In this context, "proximal" can be understood as the rear end of the device when it passes through a blood vessel during delivery, and "distal" can be understood as the front end of the device when it passes through a blood vessel during delivery.

[0042] like Figures 1 to 3 As shown, an embodiment of the present invention provides an in vivo interventional catheter mechanism, including a sheath core tube 1 and an auxiliary tube 2. An annular space 22 is provided between the inner wall of the auxiliary tube 2 and the outer wall of the sheath core tube 1, and a blocking member 21 is disposed in the annular space 22. The auxiliary tube 2 is glued to the distal end of the sheath core tube 1, and the blocking member 21 is used to confine the glue in the annular space 22, blocking the flow of the glue. Understandably, the auxiliary tube 2 is glued to the distal end of the sheath core tube 1.

[0043] In this invention, an annular space 22 is provided between the inner wall of the auxiliary tube 2 and the outer wall of the sheath core tube 1, and a blocking member 21 is provided in the annular space 22. The auxiliary tube 2 is bonded to the distal end of the sheath core tube 1 with adhesive, and the blocking member 21 is used to confine the adhesive in the annular space 22. The blocking member 21 can divide the annular space 22 into multiple small spaces, each of which can store adhesive. The blocking member 21 can also seal the annular space 22 to prevent the adhesive from leaking. The blocking member 21 can prevent the adhesive from leaking, accumulating, or leaving areas without adhesive in the annular space 22, increasing the bonding area of ​​the adhesive and ensuring the stability and bonding strength of the auxiliary tube 2 bonded to the sheath core tube 1. Moreover, the blocking member 21 can also compensate for the uneven gaps caused by the assembly tolerances between the small-sized tubes, and prevent the sheath core tube 1 from being misaligned.

[0044] The width of the annular space 22 is 0.1mm-0.3mm, and the thickness of the blocking member 21 is the same as that of the annular space 22, which can be 0.1mm-0.3mm. The blocking member 21 is just abutted between the inner wall of the auxiliary tube 2 and the outer wall of the sheath core tube 1. Understandably, in order to facilitate assembly, some assembly tolerance dimensions or some gaps can be reserved, that is, the thickness of the blocking member 21 is slightly smaller than the width of the annular space.

[0045] In one embodiment, such as Figure 2As shown, the blocking member 21 includes an annular protrusion 211, which is disposed on the inner wall of the auxiliary tube 2 facing the proximal end of the sheath core tube 1, and the annular protrusion 211 abuts against the outer wall of the sheath core tube 1. It can be understood that the annular protrusion 211 and the auxiliary tube 2 are integrally formed, and the annular protrusion 211 can prevent leakage of adhesive between the auxiliary tube 2 and the sheath core tube 1.

[0046] Specifically, after the auxiliary tube 2 and the sheath core tube 1 are erected, glue is injected into the annular space 22 between the auxiliary tube 2 and the sheath core tube 1. Since the auxiliary tube 2 and the sheath core tube 1 are in an erected state, glue is filled at any circumferential position between the auxiliary tube 2 and the sheath core tube 1. The annular protrusion 211 can prevent the glue in the annular space 22 from leaking, further ensuring the stability of the auxiliary tube 2 bonded to the sheath core tube 1.

[0047] In one embodiment, such as Figure 3 and Figure 4 As shown, the blocking member 21 includes a plurality of axial protrusions 212 circumferentially spaced on the inner wall of the auxiliary tube 2. The axial protrusions 212 extend axially along the auxiliary tube 2 and abut against the outer wall of the sheath core tube 1. The axial protrusions 212 are used to divide the annular space 22 into a plurality of liquid storage spaces 221. It can be understood that the axial protrusions 212 and the auxiliary tube 2 are integrally formed; the axial protrusions 212 protrude toward the axis of the auxiliary tube 2, and the number of axial protrusions 212 can be set according to actual needs.

[0048] The two ends of the plurality of axial protrusions 212 are flush with the two ends of the auxiliary tube 2, that is, the length of the axial protrusions 212 is consistent with that of the auxiliary tube 2, so that the entire auxiliary tube 2 can completely cover the glue.

[0049] In this embodiment, the axial protrusion 212 is positioned low between the auxiliary tube 2 and the sheath core tube 1, thereby keeping the sheath core tube 1 and the auxiliary tube 2 coaxial. The sheath core tube 1 and the auxiliary tube 2 will not be eccentric due to gravity. Even when the catheter mechanism is laid flat and waiting for the adhesive to cure, the axial protrusion 212 can also prevent the adhesive from accumulating at the bottom of the sheath core tube 1 and the auxiliary tube 2, so that all circumferential parts of the sheath core tube 1 and the auxiliary tube 2 are filled with adhesive, ensuring the bonding strength between the auxiliary tube 2 and the sheath core tube 1.

[0050] In one embodiment, such as Figures 5 to 7As shown, the blocking component includes a hollow frame structure, which includes multiple support plates 213 and a first fixing ring 214 and a second fixing ring 215 coaxially arranged. The opposite ends of the support plates 213 are respectively connected to the first fixing ring 214 and the second fixing ring 215. The first fixing ring 214 and the second fixing ring 215 are both sleeved on the sheath core tube 1. The multiple support plates 213 are spaced apart along the circumference of the first fixing ring 214 and the second fixing ring 215. The support plates 213 are used to divide the annular space 22 into multiple liquid storage spaces 221. It can be understood that the number of support plates 213 can be set according to actual needs. The first fixing ring 214, the support plates 213 and the second fixing ring 215 are integrally formed parts, while the blocking component 21 is an independent part made of stainless steel. During installation, the blocking component 21 is first sleeved on the sheath core tube 1, glue is applied, and then the auxiliary tube 2 is sleeved on the blocking component 21.

[0051] Specifically, firstly, a layer of adhesive is applied to the outer wall of the sheath core tube 1. Then, the blocking member 21 is fitted onto the distal end of the sheath core tube 1, and adhesive is applied to the blocking member 21. Finally, the auxiliary tube 2 is fitted onto the blocking member 21. In this embodiment, the blocking member 21 is disposed between the sheath core tube 1 and the auxiliary tube 2. The first fixing ring 214, the second fixing ring 215, and the support plate 213 can be directly bonded to the outer wall of the sheath core tube 1 with adhesive. The liquid storage space 221 between two adjacent support plates 213 can store a large amount of adhesive. Even when the catheter mechanism is laid flat and waiting for the adhesive to cure, the adhesive will not accumulate at the bottom due to gravity, resulting in a hollow state at the top. This further ensures the stability of the auxiliary tube 2 when adjusted on the sheath core tube 1.

[0052] In one embodiment, such as Figures 5 to 7 As shown, the inner walls of the first fixing ring 214, the second fixing ring 215, and the support plate 213 are all attached to and bonded to the outer wall of the sheath core tube 1; the outer walls of the first fixing ring 214, the second fixing ring 215, and the support plate 213 are all attached to and bonded to the inner wall of the auxiliary tube 2; it can be understood that the inner wall of the blocking member 21 is attached to the outer wall of the sheath core tube 1, and the outer wall of the blocking member 21 is attached to the inner wall of the auxiliary tube 2, thereby ensuring the stability of the blocking member 21 connected between the auxiliary tube 2 and the sheath core tube 1.

[0053] The two ends of the hollow structure blocking member 21 are flush with the two ends of the auxiliary tube 2, that is, the length of the blocking member 21 is consistent with that of the auxiliary tube 2, so that the entire auxiliary tube 2 can completely cover the glue.

[0054] An adhesive layer is provided in the accommodating space between two adjacent support plates 213. The inner wall of the auxiliary tube 2 and the outer wall of the sheath core tube 1 are respectively bonded to opposite sides of the adhesive layer. Understandably, the adhesive in the accommodating space can directly bond the auxiliary tube 2 to the sheath core tube 1. In this embodiment, the auxiliary tube 2 can be sleeved onto the sheath core tube 1 by the blocking member 21, or it can be directly bonded to the sheath core tube 1 by the adhesive layer in the accommodating space, further ensuring the stability of the auxiliary tube 2 sleeved onto the sheath core tube 1.

[0055] In other embodiments, the annular protrusion 211 and the axial protrusion 212 or the hollow frame structure can be used in combination. The annular protrusion 211 is located at the proximal end of the auxiliary tube 2, and the axial protrusion 212 or the hollow frame structure extends along the distal end of the auxiliary tube 2 toward the annular protrusion 211. The proximal end of the axial protrusion 212 or the hollow frame structure can abut against the annular protrusion 211. This combined structure avoids glue leakage while ensuring that the auxiliary tube 2 and the sheath core tube 1 are filled with glue in all circumferential directions.

[0056] In one embodiment, such as Figure 8 and Figure 9 As shown, the in vivo interventional catheter mechanism also includes a guide tube 3, which is injection molded and fitted onto the sheath core tube 1 and the auxiliary tube 2. The sheath core tube 1 is made of a polymer material combined with a metal braided mesh tube. The polymer material is, for example, a composite layer of one or more of the following materials: PTFE, Pebax, and PI. The guide tube 3 is made of Pebax. By providing a stainless steel auxiliary component between the two polymer material components, the bonding strength between the two polymer material components is enhanced.

[0057] The first inner hole of the sheath core tube 1 is connected to the second inner hole of the guide tube 3; the outer wall of the guide tube 3 is provided with a flow guiding groove 31; it can be understood that the guide tube 3 is partially sleeved on the auxiliary tube 2, the guide tube 3 is partially located at the front end of the auxiliary tube 2, and the auxiliary tube 2 is entirely located in the second inner hole of the guide tube 3.

[0058] The first inner hole of the sheath core tube 1 is the area of ​​the inner wall of the tube, which facilitates the insertion of the guide wire (not shown in the figure). The second inner hole of the guide tube 3 is the area of ​​the inner wall of the guide tube 3. After injection molding, it is sleeved on the auxiliary tube 2 and the sheath core tube 1 through the second inner hole. The guide wire can extend from the second inner hole through the first inner hole to reach the distal end of the blood vessel.

[0059] The outer diameter of the guide tube 3 gradually decreases from the proximal end of the auxiliary tube 2 toward the distal end of the auxiliary tube 2.

[0060] In this embodiment, the design of the guide tube 3 not only guides the sheath core tube 1 through the blood vessels, but also, due to the design of the auxiliary tube 2, increases the wall thickness of the guide tube 3 surrounding the auxiliary tube 2. This makes it less likely for the flow-guiding groove 31 to penetrate the guide tube 3 when it is formed, thus preventing the auxiliary tube 2 from being exposed and coming into contact with blood, ensuring the safety of the delivery catheter mechanism during delivery within the blood vessels. Furthermore, the guide tube 3 surrounding the auxiliary tube 2 has sufficient wall thickness, ensuring the strength and integrity of the guide tube 3.

[0061] In one embodiment, such as Figure 8 and Figure 9 As shown, the auxiliary tube 2 includes a first tapered tube section 23 and a first straight tube section 24 arranged coaxially; the outer diameter of the first tapered tube section 23 gradually increases from the proximal end of the sheath core tube 1 toward the distal end of the sheath core tube 1; it can be understood that the first tapered tube section 23 and the first straight tube section 24 are integrally formed parts, and the maximum outer diameter of the first tapered tube section 23 is equal to the outer diameter of the first straight tube section 24.

[0062] In one embodiment, the blocking member 21 is disposed on the inner wall of the first tapered tube section 23 and protrudes around the proximal end of the first tapered tube section 23. Understandably, the blocking member 21 is limited to an annular protrusion 211 disposed on the inner wall of the first tapered tube section 23. The design of the annular protrusion 211 increases the thickness of the first tapered tube section 23, reinforcing the structural strength of the auxiliary tube 2 whose outer wall was originally thinned, making it less prone to structural deformation during production or use.

[0063] In one embodiment, the blocking member 21 is disposed on the inner wall of the first tapered tube section 23 and the first straight tube section 24, and extends and protrudes along the axial direction of the first tapered tube section 23 and the first straight tube section 24. It can be understood that the blocking member is equivalent to an axially extending protrusion 212 disposed on the inner wall of the first tapered tube section 23 and the first straight tube section 24, which is supported between the outer wall of the sheath core tube 1 and the inner wall of the auxiliary tube 2. Thus, the axially extending protrusion 212 maintains a stable relative position between the sheath core tube 1 and the auxiliary tube 2, avoiding eccentricity between the sheath core tube 1 and the auxiliary tube 2.

[0064] In one embodiment, the blocking member 21 is disposed between the first tapered tube section 23 and the first straight tube section 24 and the sheath core tube 1. The blocking member 21 has a hollow frame structure. Understandably, the blocking member 21 is equivalent to another component disposed between the auxiliary tube 2 and the sheath core tube 1. The blocking member 21 not only has an axial protrusion (support plate) but also an annular protrusion 211 (first fixing ring 214 and second fixing ring 215). Thus, the blocking member 21 not only provides axial support between the sheath core tube 1 and the auxiliary tube 2, ensuring the coaxiality of the sheath core tube 1 and the auxiliary tube 2, allowing glue to be filled at any circumferential position of the sheath core tube 1 and the auxiliary tube 2; it also prevents glue leakage within the annular space 22 in the circumferential direction, and increases the thickness of the first tapered tube section 23, reinforcing the structural strength of the originally thinned auxiliary tube 2, making it less prone to structural deformation during production or use.

[0065] In one embodiment, such as Figure 9 As shown, the guide tube 3 includes a second conical tube section 32, a second straight tube section 33, and a third conical tube section 34 connected coaxially in sequence. From the proximal end of the sheath tube 1 toward the distal end of the sheath tube 1, the outer diameter of the second conical tube section 32 gradually increases, and the outer diameter of the third conical tube section 34 gradually decreases. Understandably, when the guide tube 3 moves forward in the blood vessel, the third conical tube section 34 can move in the blood vessel to play a guiding role. When the guide tube 3 moves backward in the blood vessel and is retracted into the sheath tube, the design of the second conical tube section 32 allows for smoother retraction into the sheath tube.

[0066] The flow guiding groove 31 includes a first groove 311, a second groove 312, and a third groove 313 connected in sequence. The first groove 311 is disposed on the outer wall of the second tapered tube section 32 sleeved on the sheath core tube 1. The second groove 312 is disposed on the outer wall of the second straight tube section 33 sleeved on the sheath core tube 1. The third groove 313 is disposed on the outer wall of the third tapered tube section 34 sleeved on the first tapered tube section 23.

[0067] In this embodiment, the second tapered section 32 and the second straight section 33 of the guide tube 3 are directly sleeved on the sheath core tube 1, and the third tapered section 34 of the guide tube 3 is sleeved on the auxiliary tube 2. The guide tube 3 is connected to both the auxiliary tube 2 and the sheath core tube 1, further ensuring the stability of the guide tube 3 sleeved on the sheath core tube 1. Due to the design of the first tapered section 23, the third tapered section 34 surrounding the first tapered section 23 has sufficient wall thickness. The third groove 313 is positioned on the outer wall of the third tapered section 34, ensuring that the third groove 313 does not easily penetrate the third tapered section 34; this also prevents the auxiliary tube 2 from being exposed, thereby further ensuring the safety of the intravascular interventional catheter mechanism during delivery. Furthermore, the design of the first groove 311, the second groove 312, and the third groove 313 allows saline solution and other fluids to flow out easily through these grooves, thereby improving the ease of cleaning the intravascular interventional catheter mechanism.

[0068] In one embodiment, such as Figure 8 and Figure 9 As shown, the bottom wall of the third groove 313 is an inclined arm; from the proximal end of the sheath core tube 1 towards the distal end of the sheath core tube 1, the distance between the inclined arm and the axis of the guide tube 3 gradually increases, that is, the inclined arm extends outward from the proximal end to the distal end, further increasing the wall thickness of this part of the guide tube 3, and the end of the third groove 313 does not cover the first straight tube segment 24. Compared with the long straight groove design of the prior art, the design of the third groove 313 of the present invention further ensures sufficient wall thickness of the guide tube and avoids the auxiliary tube 2 from being exposed. In this embodiment, the third groove 313 is deeper at the end near the second groove 312, and shallower at the end away from the second groove 312, so that the saline solution near the end of the guide tube 3 can easily flow into the second groove 312 through the first groove 311 and then out through the third groove 313. Moreover, the inclined arm design is more conducive to the smooth outward discharge of saline solution.

[0069] In one embodiment, such as Figure 9As shown, the outer wall of the first straight pipe section 24 is provided with a plurality of spaced-apart helical teeth 241; from the end near the first tapered pipe section 23 toward the end away from the first tapered pipe section 23, the distance between the helical teeth 241 and the axis of the auxiliary pipe 2 gradually decreases. Understandably, there is a helical groove between two adjacent helical teeth 241, which allows more material for the guide pipe 3 to be poured into the groove, ensuring the stability of the guide pipe 3 fitted onto the auxiliary pipe 2. Furthermore, the helical teeth 241 are inclined toward the proximal end of the auxiliary pipe 2, making it difficult for the guide pipe 3 to be pulled out of the auxiliary pipe 2, further ensuring the stability of the guide pipe 3 fitted onto the auxiliary pipe 2.

[0070] Another embodiment of the present invention provides a stent delivery device, including an outer sheath (not shown in the figure) and the aforementioned in vivo interventional catheter mechanism; the outer sheath is sleeved outside the second conical section 32 and the second straight section 33 of the guide tube 3. Understandably, the maximum cross-section of the guide tube 3 is located at the inner wall of the outer sheath, and during the cleaning process of the delivery guide mechanism inside the outer sheath, the saline solution at the outer end of the stent delivery device can flow to the distal end and be discharged through the guide groove 31.

[0071] Another embodiment of the present invention also provides a method for manufacturing the above-described in vivo interventional catheter mechanism, the method comprising:

[0072] The auxiliary tube 2 is sleeved on the sheath core tube 1; it is understood that the auxiliary tube 2 is not fixed to the distal end of the sheath core tube 1, and the blocking member abuts against the outer wall of the sheath core tube 1, and the blocking member divides the annular space 22 between the sheath core tube 1 and the auxiliary tube 2 into multiple liquid storage spaces 221.

[0073] Adhesive is filled into the annular space 22 so that the auxiliary tube 2 is bonded to the distal end of the sheath core tube 1 by the adhesive. Understandably, if the blocking member 21 extends axially along the auxiliary tube 2, it keeps the sheath core tube 1 and the auxiliary tube 2 coaxial, preventing eccentricity due to gravity. Furthermore, the blocking member prevents adhesive buildup at the bottom of the sheath core tube 1 and the auxiliary tube 2, ensuring that all circumferential portions of the sheath core tube 1 and the auxiliary tube 2 are filled with adhesive, thus guaranteeing the bonding strength between the auxiliary tube 2 and the sheath core tube 1. If the blocking member 21 is distributed circumferentially along the auxiliary tube 2, it prevents adhesive leakage from the annular space 22.

[0074] In one embodiment, filling the annular space 22 with adhesive to bond the auxiliary tube 2 to the distal end of the sheath core tube 1 via the adhesive includes:

[0075] After the sheath core tube 1 and the auxiliary tube 2 are erected along the axial direction of the sheath core tube 1, glue is filled into the annular space 22. After the glue cures, the auxiliary tube 2 is fixedly sleeved onto the distal end of the sheath core tube 1. Understandably, after the sheath core tube 1 and the auxiliary tube 2 are erected, glue is filled at any circumferential position between the auxiliary tube 2 and the sheath core tube 1, further ensuring the stability of the auxiliary tube 2 bonded to the sheath core tube 1. Furthermore, an annular protrusion 211 is provided on the inner wall of the end of the auxiliary tube 2 facing the proximal end of the sheath core tube 1, and the annular protrusion 211 abuts against the outer wall of the sheath core tube 1; the annular protrusion 211 can prevent glue between the auxiliary tube 2 and the sheath core tube 1 from leaking from one end of the auxiliary tube 2.

[0076] In one embodiment, filling the annular space 22 with adhesive to bond the auxiliary tube 2 to the distal end of the sheath core tube 1 via the adhesive includes:

[0077] First, glue is filled into the outer wall of the sheath core tube 1. Then, the blocking member 21 is fitted onto the outer wall of the sheath core tube 1, which is covered with glue. The conduit mechanism is then laid flat to allow the glue to cure. Specifically, the blocking member 21 includes an axial protrusion 212, which is positioned between the auxiliary tube 2 and the sheath core tube 1. This axial protrusion 212 keeps the sheath core tube 1 and the auxiliary tube 2 coaxial, preventing them from becoming eccentric due to gravity. Even when the conduit mechanism is laid flat while waiting for the glue to cure, the axial protrusion 212 prevents glue from accumulating at the bottom of the sheath core tube 1 and the auxiliary tube 2, ensuring that all circumferential parts of the sheath core tube 1 and the auxiliary tube 2 are filled with glue, thus guaranteeing the bonding strength between the auxiliary tube 2 and the sheath core tube 1.

[0078] In one embodiment, filling the annular space 22 with adhesive to bond the auxiliary tube 2 to the distal end of the sheath core tube 1 via the adhesive includes:

[0079] First, glue is filled into the outer wall of the sheath core tube 1. Then, the blocking member 21 is fitted onto the outer wall of the sheath core tube 1 with glue. Then, glue is filled into the outer wall of the blocking member 21. The glue can be applied by coating. The glue is applied to the first fixing ring 214, the second fixing ring 215 and the support plate 213, and also filled into multiple liquid storage spaces. Then, the auxiliary tube 2 is fitted onto the outer wall of the blocking member 21 with glue. The conduit mechanism is placed flat to allow the glue to cure. Specifically, the first fixing ring 214, the second fixing ring 215, and the support plate 213 abut against the auxiliary tube 2 and the sheath core tube 1, so that the axial protrusion 212 keeps the sheath core tube 1 and the auxiliary tube 2 in a coaxial state, and the sheath core tube 1 and the auxiliary tube 2 will not be eccentric due to gravity. Even when the catheter mechanism is laid flat and waiting for the glue to cure, the support plate 213 can also prevent the glue from accumulating at the bottom of the sheath core tube 1 and the auxiliary tube 2, so that all circumferential parts of the sheath core tube 1 and the auxiliary tube 2 are filled with glue, thus ensuring the bonding strength between the auxiliary tube 2 and the sheath core tube 1.

[0080] Compared to directly attaching the auxiliary tube 2 to the sheath core tube 1, this invention uses a blocking member 21 with a smaller contact area with the sheath core tube 1 instead of directly connecting the auxiliary tube 2 to the sheath core tube 1. On the one hand, the blocking member 21 acts as a transitional connection, allowing the difference in deformation between the auxiliary tube 2 and the sheath core tube 1 during deformation (e.g., bending) of the in vivo interventional catheter mechanism to be smoothed by the blocking member 21, releasing deformation stress, and enabling the auxiliary tube 2 and the sheath core tube 1 to adapt and extend smoothly. On the other hand, the blocking member 21, positioned in the annular space 22, restricts the flow of adhesive, allowing the adhesive to be evenly filled within the blocking member 2. In the small spaces separated by partition 1, the adhesive in each space cures to form relatively independent bonding and fixing areas. This also facilitates the deformation transition between different materials such as plastics and metals, reducing the propagation of bonding failure caused by deformation. Furthermore, all peripheral surfaces of the blocking member 21 are in contact with the adhesive, such as the axial protrusion 212 and the peripheral surfaces of the support plate 213. Compared to the auxiliary tube 2 without the blocking member 21, the blocking member 21 of this invention increases the bonding area with the adhesive. Moreover, the stress of the relatively rigid auxiliary tube 2 can be quickly released by transferring it to the adhesive through the inner ring blocking member 21. In summary, the blocking member 21 is particularly beneficial to the elastic deformation of the in vivo interventional catheter mechanism, effectively reducing the occurrence of later bonding failures caused by deformation stress in the bonding structure between the sheath core tube 1 and the auxiliary tube 2.

[0081] The above are merely embodiments of the in vivo interventional catheter mechanism, stent delivery device, and manufacturing method of the present invention, and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An intrabody interventional catheter mechanism, characterized by, It includes a sheath core tube and an auxiliary tube, the auxiliary tube being sleeved on the sheath core tube, an annular space being provided between the inner wall of the auxiliary tube and the outer wall of the sheath core tube, and a blocking element being provided in the annular space; the auxiliary tube is glued to the distal end of the sheath core tube by adhesive, and the blocking element is used to confine the adhesive in the annular space; The blocking component includes a hollow frame structure, which includes multiple support plates and a first fixing ring and a second fixing ring arranged coaxially. The opposite ends of the support plates are respectively connected to the first fixing ring and the second fixing ring. The first fixing ring and the second fixing ring are both sleeved on the sheath core tube. The multiple support plates are respectively spaced apart along the circumference of the first fixing ring and the second fixing ring. The support plates are used to divide the annular space into multiple liquid storage spaces. The inner walls of the first fixing ring, the second fixing ring, and the support plate are all attached to and bonded to the outer wall of the sheath core tube; the outer walls of the first fixing ring, the second fixing ring, and the support plate are all attached to and bonded to the inner wall of the auxiliary tube. An adhesive layer is provided in the accommodating space between two adjacent support plates, and the inner wall of the auxiliary tube and the outer wall of the sheath core tube are respectively bonded to the opposite sides of the adhesive layer.

2. The in-vivo intervention catheter mechanism according to claim 1, wherein, The auxiliary tube includes a first tapered tube section and a first straight tube section arranged coaxially. The outer diameter of the first tapered tube section gradually increases from the proximal end of the sheath core tube toward the distal end of the sheath core tube. The blocking element is disposed between the first tapered tube section and the first straight tube section and the sheath core tube, and the blocking element is a hollow frame structure.

3. The in vivo intervention catheter mechanism of claim 1, wherein, The two ends of the blocking member are flush with the two ends of the auxiliary tube.

4. A stent delivery device, characterized by, It includes an outer sheath and an in vivo interventional catheter mechanism as described in any one of claims 1 to 3; the outer sheath is sleeved on the sheath core tube and the auxiliary tube.

5. A manufacturing method for manufacturing the in-vivo intervention catheter mechanism according to any one of claims 1 to 3, characterized by, The manufacturing method includes: The auxiliary tube is fitted onto the sheath core tube; The adhesive is filled into the annular space so that the auxiliary tube is bonded to the distal end of the sheath core tube by the adhesive.

6. The in-vivo intervention catheter mechanism according to claim 5, wherein, The step of filling the annular space with glue so that the auxiliary tube is bonded to the distal end of the sheath core tube by the glue includes: After erecting the sheath core tube and the auxiliary tube along the axial direction of the sheath core tube, glue is filled into the annular space. After the glue cures, the auxiliary tube is fixedly sleeved onto the distal end of the sheath core tube; or, First, fill the outer wall of the sheath core tube with glue, then fit the blocking element onto the glued outer wall of the sheath core tube, and place the conduit mechanism flat to allow the glue to cure; or, First, fill the outer wall of the sheath core tube with glue, then put the blocking element on the outer wall of the sheath core tube with glue, then fill the outer wall of the blocking element with glue, then put the auxiliary tube on the outer wall of the blocking element with glue, and then place the conduit mechanism flat to allow the glue to cure.

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