Multi-loop structure adjustable bending endoluminal snare

Abstract

The utility model discloses a kind of cavity inside catchers of adjustable bending of multi-coil structure, the utility model relates to the field of medical equipment, and it includes: guide wire, the front end of the guide wire is provided with hanging ring part, the outside of the guide wire is equipped with catheter, the catheter upper end is equipped with external sleeve, the side of the external sleeve is provided with receiving pipe, the outside of the catheter is equipped with external tube, the upper end of the catheter and external tube connecting place is provided with bending driving part, the bending driving part is pulled to one side by pulling force after being pulled, and the bending degree of catheter to the side can be adjusted, the cavity inside catcher of adjustable bending of multi-coil structure, by using the integrated design of surrounding cross arrangement ring part, when rotating guide wire, hanging ring part front end place fast hooks target, multiple rings are gathered to the center of circle, compared with single coil structure, significantly simplify operation process, improve capture efficiency, reduce operation time.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to an intracavitary grasper with a multi-coil adjustable bend structure. Background Technology

[0002] Intracavitary graspers are tools used in the medical field to grasp instruments such as vena cava filters during certain surgical procedures. Vena cava filters are devices placed inside the vena cava to prevent diseases such as pulmonary embolism. In actual surgical procedures, a common problem when using an intracavitary grasper to grasp vena cava filters is that the filter hook easily detaches from the grasper during the grasping process. This often requires medical personnel to repeatedly manipulate the filter hook, which not only prolongs the operation time but also increases the risk of damage to the patient's veins.

[0003] Publication number CN113662704B describes a vena cava filter catcher with a limiting mechanism inside the connecting tube, which limits the position of a limiting block. After the snare catches the hook of the filter, pulling the snare's connecting rod engages the limiting block with the limiting mechanism, thus locking the filter hook to the bottom of the connecting tube. This method prevents the filter hook from detaching from the snare due to loosening during retrieval, reducing secondary operations, shortening surgical time, minimizing damage to the patient's veins, simplifying the procedure, and reducing surgical difficulty.

[0004] However, its snare structure still presents challenges in terms of ease of operation when retrieving the filter hook from the vena cava. The single-snare retrieval method lacks precision in practice, requiring medical staff to expend considerable effort adjusting the position to accurately snare the filter hook. Compared to a multi-snare structure operating in tandem, it falls short in quickly and accurately grasping the filter hook, hindering efficient connection between the hook and the snare and impacting overall surgical efficiency.

[0005] Therefore, in order to address the shortcomings of the existing technology, we conducted research and improvements and proposed a multi-ring structure adjustable intracavitary capture device. Utility Model Content

[0006] The purpose of this invention is to provide an intracavitary catcher with a multi-ring adjustable bending structure to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a multi-loop adjustable bendable intracavitary catcher, comprising: a guide wire, wherein a hanging loop is provided at the front end of the guide wire;

[0008] The guidewire is fitted with a conduit, the upper end of the conduit is fitted with an external sleeve, one side of the external sleeve is provided with a receiving tube, and the conduit is fitted with an external tube.

[0009] The upper end of the connection between the catheter and the external tube is provided with a bending-reducing part. The bending-reducing part can adjust the degree of bending of the catheter to one side after being pulled to one side by a pulling force.

[0010] A locking part is provided at the upper end of the connection between the guidewire and the catheter, which can prevent the guidewire from moving along the horizontal axis when the guidewire and the catheter move synchronously.

[0011] An air-resistance section is provided at one end of the conduit near the collar, and the air-resistance section can be enlarged to contract inwards towards the conduit.

[0012] Furthermore, the hanging ring is composed of multiple interwoven and surrounding circles of similar size, centered on a point in space, and distributed at a certain angle to each other, forming an approximately spherical shape in three-dimensional space. The hanging ring and the guide wire are integrated into one unit.

[0013] Furthermore, the circles in the hanging ring section do not overlap significantly. Through interlacing and combining, they jointly construct a symmetrical external structure, and are connected to one end of the guide wire at the overlapping point.

[0014] Furthermore, the bending section is composed of a tension member and an end-point retaining member, wherein the length of the tension member is greater than the length of the conduit.

[0015] Furthermore, the endpoint retainer may consist of two arc-shaped components of the same shape, with the mounting points of the two arc-shaped components located at the bottom end of the inner side of the conduit and the top end of the outer side of the conduit, respectively.

[0016] Furthermore, the inner side of each end retainer is provided with a hole, the diameter of which is larger than the diameter of the pulling member.

[0017] Furthermore, the tensioning member and the end-point retaining member are vertically connected.

[0018] Furthermore, the clamping part consists of a first expansion member and an air inlet member. The first expansion member is disposed at the upper end of the gap between the guide wire and the guide tube, and the air inlet member is connected to the first expansion member.

[0019] Furthermore, the outer part of the first expansion member is bonded to the conduit, and a miniature one-way valve is provided between the first expansion member and the air intake member.

[0020] Furthermore, the air resistance section consists of a second expansion member and a conveying member. The second expansion member is located at the end of the conduit away from the clamping part, and the second expansion member and the conveying member are connected to each other. The conveying member is connected to the first expansion member built into the clamping part, and a miniature one-way valve is provided between the conveying member and the first expansion member.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. This utility model adopts an integrated design of circling and cross-arranged ring parts in the hanging ring part. When rotating the guide wire, the front end of the hanging ring part quickly hooks the target object, and multiple rings work together to gather towards the center. Compared with the single ring structure, it significantly simplifies the operation process, improves capture efficiency, and reduces operation time.

[0023] 2. This utility model uses a bending section composed of a pulling member and an end-point retaining member. The bending degree of the catheter is adjusted by the pulling force. The end-point retaining member adopts a double-arc structure to ensure that the pulling member is vertically inserted and flexible, so as to realize the controllable bending of the catheter at multiple angles, adapt to complex paths in the body, and improve the accuracy of operation.

[0024] 3. This utility model uses the expansion component of the clamping part and the air inlet component to expand the expansion component by filling it with gas, which effectively fixes the relative position of the guide wire and the guide tube, prevents horizontal axis displacement, ensures the positioning stability of the hanging ring part, and avoids the risk of capture failure due to guide wire shaking.

[0025] 4. This utility model connects the expansion and contraction parts of the air resistance section with the conveying parts and the clamping part. When the expansion and contraction parts are filled with gas, the gas is delivered to the expansion and contraction parts at the front end of the conduit through a one-way valve, causing it to contract inward and tightly press against the connection point between the target object and the hanging ring, preventing it from falling off and improving the reliability of the capture. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall multi-ring adjustable curved cavity capture device of this utility model;

[0027] Figure 2 This is an enlarged schematic diagram of the structure at point A of this utility model (details of the connection between the hanging ring and the guide wire).

[0028] Figure 3 This is a schematic diagram of the multi-ring adjustable curved cavity capture device of this utility model from another perspective.

[0029] Figure 4 This is an enlarged schematic diagram of the structure at point B of this utility model (details of the bending section).

[0030] Figure 5 This is another overall schematic diagram of the multi-ring adjustable curved cavity grabber of this utility model.

[0031] Figure 6 This is an enlarged schematic diagram of the structure at point C of this utility model (details of another part of the bending section).

[0032] Figure 7 This is another overall view of the multi-ring adjustable curved cavity grabber of this utility model.

[0033] Figure 8 This is an enlarged schematic diagram of the structure at point D of this utility model (details of the clamping part).

[0034] In the diagram: 1. Guidewire; 2. External sleeve; 3. External tube; 4. Catheter; 5. First micro-inflator; 6. Loop; 7. Pull wire; 8. Pull block; 9. Inlet tube; 10. Receiving tube; 11. Lower patch; 12. Second micro-inflator; 13. Air delivery tube. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] like Figures 1-8 As shown, an adjustable-bend intracavitary catcher with a multi-coil structure includes: a guide wire 1, with a hanging loop at the front end of the guide wire 1.

[0037] The guide wire 1 is fitted with a conduit 4, the upper end of the conduit 4 is fitted with an outer sleeve 2, a receiving tube 10 is provided on one side of the outer sleeve 2, and an outer tube 3 is fitted with the outside of the conduit 4.

[0038] The upper end of the connection between the catheter 4 and the external tube 3 is provided with a bending-reducing part. After the bending-reducing part is pulled to one side by the pulling force, the degree of bending of the catheter 4 to that side can be adjusted.

[0039] A locking part is provided at the upper end of the connection between guidewire 1 and catheter 4. The locking part can prevent guidewire 1 from moving along the horizontal axis when guidewire 1 and catheter 4 move synchronously.

[0040] An air-resistance section is provided at one end of the conduit 4 near the collar 6. The air-resistance section can contract inwards from the conduit 4 by enlarging its own structure.

[0041] Example 1: As Figure 1 , Figure 3 , Figure 5 , Figure 7As shown, the hanging loop section consists of multiple interwoven and surrounding circles of similar size, centered on a point in space, intersecting each other at a certain angle, and forming an approximately spherical shape in three-dimensional space. The hanging loop section and the guide wire 1 are integrally integrated.

[0042] There is no obvious overlap between the circles in the hanging loop section. Through interlacing and combination, they jointly construct a symmetrical shape structure, and are connected to one end of the guide wire 1 at the overlapping point.

[0043] The loop in the hanging part can be set as a loop 6. One end of the loop 6 is connected to one end of the guidewire 1. Since the front end of the guidewire 1 is provided with loops 6 arranged in a crisscross pattern, when the loop 6 is close to the hook at one end of the vena cava filter, the guidewire 1 is rotated, and the guidewire 1 drives the loop 6 to rotate. The front end of the loop 6 can be bent to one side, so that the loop 6 can be quickly hooked on the inside of the hook of the vena cava filter. At this time, when the guidewire 1 drives the loop 6 to retract towards the front end of the catheter 4, all the loops 6 can be gathered towards the center of the catheter 4, so as to make up for the problem of cumbersome operation when a single loop 6 contacts the hook of the vena cava filter.

[0044] Example 2: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown in Figures 6 and 7, the bending section consists of a tension member and an end retainer, with the length of the tension member being greater than the length of the guide tube 4.

[0045] The end retainer can be composed of two arc-shaped pieces with the same shape. The mounting points of the two arc-shaped pieces are located at the bottom of the inner side of the conduit 4 and the top of the outer side of the conduit 4, respectively.

[0046] The tension member and the end retaining member are connected vertically through.

[0047] The puller can be a pull wire 7, and the end retainer can be a lower patch 11 and a pull block 8. The lower patch 11 is attached to the outside of the conduit 4 near the port of the collar 6, and the pull block 8 is installed on the inside of the external tube 3 near the top of the guide wire 1. Both the lower patch 11 and the pull block 8 have through holes on their inner sides. The pull wire 7 passes vertically through the inside of the lower patch 11 and the pull block 8, and the pull wire 7 and the lower patch 11 are fixedly connected. The pull wire 7 can also be pulled up and down on the inside of the pull block 8. When the pull wire 7 is pulled, it will cause the lower patch 11 to bend upward. The lower patch 11, the pull wire 7, and the pull block 8 are arranged in a ring on the inside of the external tube 3. Therefore, when the operator wants to bend the conduit 4, he only needs to pull the pull wire 7 in the opposite direction, and the pull wire 7 will cause the lower patch 11 at the corresponding position to bend to one side, so that the conduit 4 bends in the specified direction.

[0048] Example 3: Figure 1 , Figure 5 , Figure 7 , Figure 8 As shown, the clamping part consists of a first retractable component and an air inlet component. The first retractable component is located at the upper end of the gap between the guide wire 1 and the guide tube 4, and the air inlet component is connected to the first retractable component.

[0049] The first expansion component is bonded to the outside of the conduit 4, and a miniature one-way valve is provided between the first expansion component and the air inlet component.

[0050] The first expansion component can be configured as the second micro-inflator 12, and the air inlet component can be configured as the air inlet pipe 9. The air inlet pipe 9 can be used to connect to an external air pump or other air delivery device. Since the air inlet pipe 9 can be connected to an external air pump, the air pump inputs gas from the air inlet pipe 9. The air inlet pipe 9 is connected to the second micro-inflator 12, so the air inlet pipe 9 introduces gas into the interior of the second micro-inflator 12. At this time, the second micro-inflator 12 begins to collide. Since the second micro-inflator 12 is installed at the upper end between the catheter 4 and the guidewire 1, the expansion of the second micro-inflator 12 will cause the upper part of the guidewire 1 inside the catheter 4 to be stuck. This is to prevent the guidewire 1 from maintaining its axial shape when it is not capturing the vena cava filter, and to prevent the guidewire 1 from suddenly bending and causing the position of the loop 6 to shift.

[0051] Example 4: Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, the air resistance section consists of a second expansion member and a conveying member. The second expansion member is located at the end of the conduit 4 away from the clamping part, and the second expansion member and the conveying member are connected to each other. The conveying member is connected to the first expansion member built into the clamping part. A miniature one-way valve is provided between the conveying member and the first expansion member.

[0052] The second expansion component can be configured as the first micro-inflator 5, and the delivery component can be configured as the air guide tube 13. Since the exterior of the second micro-inflator 12 is connected to one end of the air guide tube 13, and the air guide tube 13 is located inside the conduit 4, while the other end of the air guide tube 13 is connected to the first micro-inflator 5, which is located at the port of the conduit 4 near the collar 6, when the gas inside the second micro-inflator 12 has been filled for a period of time, and the operator intends to extend the guide wire 1, the micro one-way valve at the connection between the air guide tube 13 and the second micro-inflator 12 opens, allowing gas to flow from the second micro-inflator 12 through... The air flows into the interior of the first micro-inflator 5 through the endotracheal tube 13. The first micro-inflator 5 has a folded and retractable structure. The diameter of the structure on the outside of the first micro-inflator 5 placed at the front end of the catheter 4 is larger than the diameter at the front end of the catheter 4. Therefore, when the first micro-inflator 5 inflates, the part of the first micro-inflator 5 placed at the front end of the catheter 4 inflates towards the inside of the catheter 4. This part of the first micro-inflator 5 abuts against the connection between the loop 6 and the vena cava filter hook at the end of the catheter 4. This is to prevent the vena cava filter hook from detaching from the loop 6 when the loop 6 is dragged on the vena cava filter.

[0053] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A multi-coil adjustable bendable intracavitary grasper, comprising: The guide wire (1) is characterized in that a hanging loop is provided at the front end of the guide wire (1); The guidewire (1) is fitted with a conduit (4), the upper end of the conduit (4) is fitted with an outer sleeve (2), a receiving tube (10) is provided on one side of the outer sleeve (2), and an outer tube (3) is fitted on the outside of the conduit (4). The upper end of the connection between the conduit (4) and the external tube (3) is provided with a bending-reducing part. After the bending-reducing part is pulled to one side by the pulling force, the degree of bending of the conduit (4) to that side can be adjusted. A locking part is provided at the upper end of the connection between the guidewire (1) and the catheter (4). The locking part can prevent the guidewire (1) from moving along the horizontal axis when the guidewire (1) and the catheter (4) move synchronously. An air resistance section is provided at one end of the conduit (4) near the collar (6), and the air resistance section can shrink inwards from the conduit (4) by enlarging its own structure.

2. The multi-ring adjustable bending intracavity grasper according to claim 1, characterized in that, The hanging ring part consists of multiple circles of similar size intertwined and surrounding each other, centered on a point in space, and distributed at a certain angle to each other, forming an approximately spherical shape in three-dimensional space. The hanging ring part and the guide wire (1) are integrated.

3. The multi-ring adjustable bending intracavity grasper according to claim 2, characterized in that, There is no obvious overlap between the circles in the hanging ring section. Through interlacing and combination, they jointly construct a symmetrical shape structure, and are connected to one end of the guide wire (1) at the overlapping point.

4. The multi-ring adjustable bending intracavity grasper according to claim 1, characterized in that, The bending section is composed of a tension member and an end-point retaining member, and the length of the tension member is greater than the length of the conduit (4).

5. The multi-ring adjustable bending intracavity grasper according to claim 4, characterized in that, The endpoint retainer can be composed of two arc-shaped components with the same shape. The mounting points of the two arc-shaped components are located at the bottom of the inner side of the conduit (4) and the top of the outer side of the conduit (4), respectively.

6. The multi-ring adjustable bending intracavity grasper according to claim 5, characterized in that, The inner side of each end retainer is provided with a hole, the diameter of which is larger than the diameter of the pull member.

7. The multi-ring adjustable bending intracavity grasper according to claim 6, characterized in that, The tension member and the end-point retaining member are vertically connected.

8. The multi-ring adjustable bending intracavity grasper according to claim 1, characterized in that, The clamping part consists of a first expansion member and an air inlet member. The first expansion member is located at the upper end of the gap between the guide wire (1) and the guide tube (4), and the air inlet member is connected to the first expansion member.

9. The multi-ring adjustable bending intracavity grasper according to claim 8, characterized in that, The first expansion member is bonded to the outside of the conduit (4), and a miniature one-way valve is provided between the first expansion member and the air inlet member.

10. The multi-ring adjustable bending intracavity grasper according to claim 1, characterized in that, The air resistance section consists of a second expansion member and a conveying member. The second expansion member is located at the end of the conduit (4) away from the clamping part, and the second expansion member and the conveying member are connected to each other. The conveying member is connected to the first expansion member built into the clamping part. A miniature one-way valve is provided between the conveying member and the first expansion member.

Images