Delivery system for self-expanding stent
By using a combination of limit clamps and elastic fixtures in the self-expanding stent delivery system, multiple recovery and repositioning of the stents are achieved, solving the problem that the stent is difficult to stabilize and position in the prior art, and improving the surgical Accuracy and security.
Patent Information
- Application Number
- CN202323424022.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-15
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2033-12-15
AI Technical Summary
The existing self-expanding stent delivery system is difficult to achieve multiple precise positioning and stable fixation during the recycling and release process, and there is a risk of disengagement.
A conveying system including push core rod, conduit, limit clamp, and elastic fixture is designed. The limit clamp is composed of limit block and elastic clamp. The elastic fixture has elastic contact foot and penetrates through the elastic contact foot. The bracket is fixed through the mesh, and the movement of the catheter is combined to achieve multiple recovery and repositioning of the bracket.
Multiple recycling, repositioning and stable fixation of the self-expanding stent are achieved, which improves the safety and success rate of the surgery and avoids the risk of accidental disengagement of the stent.
Smart Images
Figure CN222304103U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a medical device, in particular to a conveying system of a self-expanding bracket. Background Art
[0002] The implantation of intravascular stents is an interventional technique used to treat various types of vascular diseases. Its main purpose is to maintain normal blood supply in human blood vessels. Stents can be used to open narrow blood vessels, block deformed and mutated vascular structures, etc., to provide support and reshape unobstructed blood flow channels.
[0003] During surgery, if you want to implant a stent into a specific lesion in a blood vessel, you need to use specific tools. For the delivery system of self-expanding stents, a push block is usually set at the proximal end of the stent to push it directly out of the catheter, but if the release position is deviated, this method cannot withdraw the stent; another method is to add a layer of friction between the stent and the core rod, and use friction to recover and release the stent, but this method has the risk of the stent detaching. Utility Model Content
[0004] The utility model aims to provide a delivery system for a self-expanding stent, and the technical problem to be solved is to realize multiple recovery and repositioning of the self-expanding stent and to prevent the self-expanding stent from accidentally leaving the delivery system.
[0005] In order to solve the above problems, the utility model adopts the following technical solutions: a delivery system of a self-expanding stent, comprising a push core rod and a catheter, wherein the push core rod is arranged in the catheter, the push core rod and the catheter can move axially relative to each other, and a limit clamp and an elastic fixing member are arranged on the push core rod from the proximal end to the distal end, and there is a spacing between the limit clamp and the elastic fixing member;
[0006] The limit clamp comprises a limit block and an elastic clamp. The elastic clamp is provided with at least one pair, symmetrically arranged at opposite ends of the limit block. The elastic clamp expands outward in a natural state, and the opening direction of the elastic clamp is opposite to the elastic fixing piece.
[0007] The elastic fixing member includes at least one group of symmetrically arranged elastic contact feet, which extend toward the limiting clamp so that the proximal end of the elastic contact foot forms a contact foot free end. In the natural state, the free end of the elastic contact foot is located between the elastic clamp and the limiting block in the natural state.
[0008] Furthermore, an anti-slip pressure block which can be deformed after being pressed is provided on the surface of the elastic clamp opposite to the limiting block.
[0009] Furthermore, the anti-slip pressing block is made of silicone, rubber or thermoplastic polyurethane elastomer material.
[0010] Furthermore, the elastic clamp is in sheet shape.
[0011] Furthermore, the elastic clamp is made of nickel titanium, stainless steel, polyester, nylon or polytetrafluoroethylene.
[0012] Furthermore, the elastic contact pin is a sheet-shaped, needle-shaped or linear structure.
[0013] Furthermore, the elastic contact foot has an outer shape of an arc, a straight line, a trapezoid or a step.
[0014] Furthermore, the elastic contact pin is made of nickel titanium, stainless steel, polyester, nylon or polytetrafluoroethylene.
[0015] Furthermore, the pushing core rod is made of nickel titanium or stainless steel.
[0016] Compared with the prior art, the utility model is provided with spaced-apart limit clamps and elastic fixing members on the pushing core rod. The elastic clamps of the limit clamps expand outwards in a natural state. The elastic fixing members have elastic feelers, which are located between the elastic clamps and the limit blocks in a natural state. When the conveying system conveys the self-expanding stent, the free ends of the feelers pass through the stent mesh on the proximal end of the self-expanding stent and are pressed between the contracted elastic clamps and the limit blocks, so that the self-expanding stent is fixed on the pushing core rod, preventing the self-expanding stent from escaping from the conveying system. When the distal end of the self-expanding stent is released, it can be recovered and repositioned multiple times according to the situation, so that the conveying system provides more reliable pushing performance and a stable way of fixing the self-expanding stent, thereby improving the safety of the operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic structural diagram of a partial release of the self-expanding stent of the utility model.
[0018] Figure 2 It is a schematic diagram of the structure of the utility model for recovering the self-expanding stent and repositioning it.
[0019] Figure 3 It is a schematic diagram of the structure of the utility model in which the self-expanding stent is fully released.
[0020] Figure 4 It is a schematic diagram of the utility model after the elastic fixing piece and the self-expanding bracket are separated.
[0021] Figure 5 It is a schematic diagram of the utility model in which the limiting clamp and the elastic fixing member are received in the conduit.
[0022] Figure 6 It is a schematic diagram of the recycling limit clamp and the elastic fixing member of the utility model.
[0023] Figure 7It is a structural schematic diagram of another shape of the elastic contact foot of the utility model.
[0024] Figure 8 It is a structural schematic diagram of the third shape of the elastic contact foot of the utility model.
[0025] Fig. 9 It is a structural schematic diagram of the fourth shape of the elastic contact foot of the utility model.
[0026] Fig.10 It is a structural schematic diagram of the fifth shape of the elastic contact foot of the utility model. DETAILED DESCRIPTION
[0027] The utility model is further described in detail below with reference to the accompanying drawings and embodiments.
[0028] like Figure 1 , Figure 5 and Figure 6 As shown, the utility model discloses a delivery system of a self-expanding stent, comprising a push core rod 3 and a catheter 1, wherein the push core rod 3 is arranged in the catheter 1, and the push core rod 3 and the catheter 1 can move axially relative to each other, and a limit clamp 5 and an elastic fixing member 6 are arranged on the push core rod 3 from the proximal end to the distal end, and there is a distance between the limit clamp 5 and the elastic fixing member 6;
[0029] The limit clamp 5 includes a limit block 52 and an elastic clamp 51. The limit block 52 is cylindrical and fixed on the push core rod 3. A pair of elastic clamps 51 are symmetrically arranged on opposite ends of the limit block 52. The proximal end of the elastic clamp 51 is fixed to the limit block 52, or connected by a connecting plate and fixed to the proximal end of the limit block 52 through the connecting plate. The distal end of the elastic clamp 51 expands outward in a natural state, and the opening direction of the elastic clamp 51 is opposite to the elastic fixing member 6. After the elastic clamp 51 is contracted, the distal end of the elastic clamp 51 contacts the distal outer wall of the limit block 52.
[0030] The elastic fixing member 6 includes a group of symmetrically arranged elastic contact pins 7, which are arranged on a fixing block 4. A group of elastic contact pins 7 includes two elastic contact pins. The elastic contact pins 7 extend toward the limiting clamp 5 so that the proximal ends of the elastic contact pins 7 form contact pin free ends 71. In the natural state, the contact pin free ends 71 are located between the elastic clamp 51 and the limiting block 52 in the natural state.
[0031] When the limiting clamp 5, the elastic fixing member 6 and the self-expanding stent 2 are placed in the lumen of the catheter 1, the free end 71 of the feeler passes through the stent mesh on the proximal end of the self-expanding stent 2 and is compressed between the elastic clamp 51 and the limiting block 52, so that the self-expanding stent 2 cannot be separated from the elastic fixing member 6;
[0032] like Figure 1 and Figure 2 As shown, when the catheter 1 is withdrawn toward the proximal end of the pushing core rod 3, the distal end portion of the self-expanding stent 2 is released, and by pushing the catheter 1 toward the distal end of the self-expanding stent 2, the released portion is recovered into the catheter 1 again, so as to adjust the release position of the self-expanding stent;
[0033] like Figure 3 As shown, when the self-expanding stent 2 is completely released, the free end 71 of the contact foot is expanded by the released self-expanding stent 2 and detaches from the limiting clamp 5;
[0034] like Figure 4 As shown, when the limiting clamp 5 and the elastic fixing member 6 are recovered, the pushing core rod 3 is pushed toward the distal end of the catheter 1, so that the free end 71 of the contact foot is separated from the stent mesh of the self-expanding stent 2 ( Figure 4 As shown), after the elastic contact foot 7 returns to the natural state, the free end 71 of the contact foot is located between the elastic clamp 51 and the limit block 52 in the natural state ( Figure 5 As shown in FIG. 1 , when the catheter 1 is pushed so that the limiting clamp 5 is recovered into the catheter 1 , the elastic contact foot 7 is pressed between the elastic clamp 51 and the limiting block 52 ( Figure 6 As shown in the figure), the pushing core rod 3 is pulled toward the proximal end of the catheter 1, so that the elastic fixing member 6 and the limiting clamp 5 are completely recovered into the catheter 1.
[0035] like Figure 3 As shown, an anti-slip pressing block 53 is provided on the surface of the elastic clamp 51 opposite to the limiting block 52. Figure 1 As shown, when the elastic clamp 51 contracts and contacts the distal end surface of the limiting block 52 , the anti-slip pressing block 53 contacts the distal end surface of the limiting block 52 .
[0036] The anti-slip pressing block 53 is made of silicone, rubber or thermoplastic polyurethane elastomer material to provide softness and easy deformation, provide a certain friction and deformation capacity, and effectively press the elastic contact foot 7 to prevent the elastic contact foot 7 from falling off.
[0037] The elastic clamp 51 is in sheet shape and is made of nickel titanium, stainless steel, polyester, nylon or polytetrafluoroethylene.
[0038] In the utility model, the elastic clamp 51 serves as a fixing component of the elastic feeler 7, so that the free end 71 of the feeler forms a closed loop after passing through the stent mesh on the self-expanding stent, so that the self-expanding stent can be fixed on the pushing core rod, and at the same time, the elastic feeler 7 is assisted to be recovered into the catheter 1 during recovery.
[0039] As an implementation mode of the present invention, the elastic contact pin 7 is a sheet-shaped, needle-shaped or linear structure.
[0040] The needle-like structure can be understood as a variable diameter structure whose cross-section is circular, whose cross-section diameter at one end is larger than that at the other end, which has a certain strength and hardness to maintain its shape or direction, and is made of metal or non-metal material;
[0041] The linear structure can be understood as a structure with a circular cross-section, the same diameter throughout the structure, a straight line or a wavy line, and is made of metal or non-metal materials.
[0042] Of course, when the elastic contact pin 7 adopts a sheet-like or needle-like structure, the elastic contact pin 7 can also adopt an arc-shaped, straight-line-shaped, trapezoidal or stepped shape; wherein: Figure 7 As shown, the elastic contact foot 7 is in a step shape, and the step shape is a step structure with only one step, wherein there are two step surfaces parallel to each other and an inclined surface, and the height of the step surface adjacent to the limit block 52 is higher than the height of the step surface at the far end; Figure 8 The elastic contact foot 7 is a trapezoid; Fig. 9 As shown, the elastic contact foot 7 is arc-shaped; Fig.10 As shown, the elastic contact foot 7 is in a straight line shape.
[0043] The metal material may be nickel titanium or stainless steel; the non-metal material may be polyester, nylon or polytetrafluoroethylene.
[0044] The pushing core rod 3 is made of nickel-titanium or stainless steel. When nickel-titanium is used, it has good flexibility and elasticity; when unmodified materials are used, it has high hardness and strong thrust.
[0045] The utility model has a more stable way of fixing the self-expanding stent, and the self-expanding stent will not accidentally fall off. The self-expanding stent can be recovered and repositioned and released multiple times before it is completely released, thereby improving the accuracy, safety and success rate of the operation.
Claims
1. A self-expanding stent delivery system, comprising a push core rod (3) and a catheter (1), characterized in that: The push core rod (3) is arranged in the catheter (1), and the push core rod (3) and the catheter (1) can move axially relative to each other. A limit clamp (5) and an elastic fixing member (6) are arranged on the push core rod (3) from the proximal end to the distal end, and a spacing is provided between the limit clamp (5) and the elastic fixing member (6); The limiting clamp (5) comprises a limiting block (52) and an elastic clamp (51). The elastic clamp (51) is provided with at least one pair and is symmetrically arranged at opposite ends of the limiting block (52). The elastic clamp (51) expands outward in a natural state, and the opening direction of the elastic clamp (51) is opposite to the elastic fixing member (6). The elastic fixing member (6) comprises at least one group of symmetrically arranged elastic contact pins (7), the elastic contact pins (7) extending towards the limiting clamp (5) so that the proximal ends of the elastic contact pins (7) form contact pin free ends (71), and when the elastic contact pins (7) are in a natural state, the contact pin free ends (71) are located between the elastic clamp (51) and the limiting block (52) in the natural state.
2. The self-expanding stent delivery system according to claim 1, characterized in that: An anti-slip pressure block (53) which can be deformed after being pressed is provided on the surface of the elastic clamp (51) opposite to the limiting block (52).
3. The self-expanding stent delivery system according to claim 2, characterized in that: The anti-slip pressing block (53) is made of silicone, rubber or thermoplastic polyurethane elastomer material.
4. The delivery system of the self-expanding stent according to claim 3, characterized in that: The elastic clamp (51) is in sheet shape.
5. The self-expanding stent delivery system according to claim 4, characterized in that: The elastic clamp (51) is made of nickel titanium, stainless steel, polyester, nylon or polytetrafluoroethylene.
6. The self-expanding stent delivery system according to any one of claims 1 to 5, characterized in that: The elastic contact foot (7) is in the form of a sheet, needle or line.
7. The delivery system of the self-expanding stent according to claim 6, characterized in that: The elastic contact foot (7) has an outer shape of an arc, a straight line, a trapezoid or a step.
8. The delivery system of the self-expanding stent according to claim 7, characterized in that: The elastic contact foot (7) is made of nickel titanium, stainless steel, polyester, nylon or polytetrafluoroethylene.
9. The delivery system of the self-expanding stent according to claim 1, characterized in that: The pushing core rod (3) is made of nickel titanium or stainless steel.