Mechanical release spring ring structure with high reliability

Abstract

The application discloses a high-reliability mechanical release spring ring structure, which comprises a pushing rod, a spring ring, a release wire and a baffle. The pushing rod is a hollow tubular structure, and a bayonet and an open port are arranged on the distal end of the pushing rod. One end of the spring ring is connected to a connecting head, and the spring ring is connected to the pushing rod through the connecting head. The release wire is arranged axially along the pushing rod and extends from the proximal end of the pushing rod. One end of the baffle extends into the cavity of the pushing rod, and the other end is located in the open port and connected to the release wire. In the limiting state, the connecting head is clamped in the bayonet, so that the bayonet is limited along the axial direction of the pushing rod, and the connecting head is limited along the radial direction of the pushing rod. In the release state, the baffle completely extends into the cavity of the pushing rod, and the connecting head is released from the bayonet and the baffle. The application can realize the quick and stable release of the spring ring and the pushing rod, enhance the certainty of the release, and improve the stability of the release.

Description

Technical Field

[0001] This invention relates to the field of release spring coil technology, specifically a highly reliable mechanical release spring coil structure. Background Technology

[0002] Mechanically detachable coils are commonly used in interventional procedures and are classified as medical devices. A mechanically detachable coil consists of a push rod and a coil. The connector on the coil relies on the elasticity of the coil to pull the connector out of the connection area on the push rod. This connection area is where the push rod and coil connect, and it is formed on the push rod. Existing mechanically detachable coils often have a closed annular structure for the connection area, leaving only an axial opening for the connector to extend into the cavity of the push rod; that is, an opening is only provided on the distal end face of the push rod. With this type of structure, if during use, the connection area of ​​the push rod forms an angle with the coil—meaning the connector on the coil is no longer parallel to the push rod but forms an angle—a torque may be generated, potentially jamming the connector within the connection area. This can result in a situation where release is difficult or impossible, meaning the connector cannot detach from the push rod. If release is difficult or impossible, it can lead to adhesion and adverse effects. Therefore, a mechanical release spring coil structure that can avoid being difficult or impossible to release is needed to ensure high reliability of release. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide a highly reliable mechanical release spring coil structure that can solve the problems described in the background art.

[0004] The technical solution to achieve the objective of this invention is: a highly reliable mechanical release spring coil structure, comprising:

[0005] The push rod is a hollow tubular shape. A bayonet and an open end are located at the distal end of the push rod, respectively, at the upper and lower ends along the radial direction. The projection of the bayonet falls entirely on the projection of the open end.

[0006] A spring coil is located at the distal end of the push rod. One end of the spring coil is connected to a connector, which is located outside the spring coil. The spring coil is connected to the push rod through the connector.

[0007] The release wire is positioned along the axial direction of the push rod and extends from the proximal end of the push rod.

[0008] A baffle is included, with one end extending into the cavity of the push rod and sliding along the axis of the push rod within the cavity. The other end of the baffle is located within the opening and connected to the release wire.

[0009] In the limited position, one end of the baffle extends out of the cavity of the push rod and is located inside the open opening. The connector is engaged in the bayonet, so that the bayonet limits the connector and the baffle along the axial direction of the push rod.

[0010] In the released state, the baffle extends fully into the cavity of the push rod, exposing the opening, and the connector disengages from the bayonet and the baffle's restraints.

[0011] Furthermore, a ball head is connected to the other end of the spring coil, and part of the ball head is inserted into the spring coil and connected to the spring.

[0012] Furthermore, the shape of the baffle is adapted to the side wall of the push rod, and the baffle is an arc shape with grooves.

[0013] Furthermore, it also includes an end cap, with one end of the release wire extending from the proximal end of the push rod and fixedly connected to the end cap, the end cap being fitted against the end face of the proximal end of the push rod.

[0014] Furthermore, an injection port for injecting connecting material is also provided on the side wall of the push rod, and the injection port is located near the end of the push rod.

[0015] The connecting material is injected into the cavity of the push rod through the injection port and then flows out towards the end face of the push rod near the end, forming an end with an arc-shaped outer contour on the end face of the push rod, which wraps around the release wire.

[0016] Furthermore, the push rod is also provided with a break cut to facilitate breaking the push rod, and the break cut is close to the proximal end of the push rod.

[0017] Furthermore, the break-off notch is either a break-off groove or a series of intermittent perforations. The break-off groove is arranged around the circumference of the push rod, and the intermittent perforations are also arranged around the circumference of the push rod.

[0018] Furthermore, it also includes a stop block located inside the cavity of the push rod. The stop block abuts against and is confined to the baffle to prevent the baffle from flipping over.

[0019] Furthermore, the stop block is spherical, and a limiting opening is also provided on the side wall of the push rod, with the upper end of the stop block being engaged in the limiting opening.

[0020] Furthermore, a notch is cut into the side wall of the push rod, so that the end of the push rod near the spring coil forms a support part. The support part acts as a fulcrum. In the limited state, the connector is locked in the notch, and the spring coil is connected to the connector through the connector. The two ends of the connector are respectively connected to the spring coil, the connector and the support part to form a lever. The support part acts as the fulcrum of the lever.

[0021] The beneficial effects of this invention are as follows: This invention enables quick and stable release of the spring coil from the push rod, maintains the integrity of the release area before release, reduces the contact area of ​​the release area after release, reduces the adhesion between the connector and the spring coil, enhances the certainty of release, and improves the stability of release. Furthermore, it has a simple structure, is easy to assemble, and facilitates the processing and production of parts. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3 This is a three-dimensional structural diagram of the push rod;

[0025] Figure 4 A schematic diagram showing the connection between the release wire and the baffle;

[0026] Figure 5 This is a partial structural diagram of the connection between the spring coil and the push rod (excluding the stop block).

[0027] Figure 6 This is a partial structural diagram (including the stop block) showing the connection between the spring coil and the push rod.

[0028] Figure 7 The shape of the spring coil connector is different from Figure 4 , Figure 5 A partial structural diagram (excluding the stop block) showing the connection between another spring coil and the push rod in this scenario.

[0029] Figure 8 The shape of the stop is different from Figure 5 , Figure 6 A partial structural diagram illustrating the connection between another spring coil and the push rod in this scenario;

[0030] Figure 9 This is a cross-sectional schematic diagram of the present invention;

[0031] Figure 10 This is a schematic diagram of the force analysis;

[0032] In the diagram, 1-ball head, 2-spring coil, 3-baffle, 4-bayonet, 41-support part, 5-connector, 6-push rod, 7-break-off cut, 8-injection port, 9-end, 10-open port, 11-release wire, 12-stop block, 13-limit port. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0034] like Figures 1-10 As shown, a highly reliable mechanical release spring coil structure includes a push rod 6, a spring coil 2, a release wire 11, and a baffle 3. The push rod 6 is a hollow tube, meaning that a cavity is provided through the push rod 6 along its axial direction. A bayonet 4 and an opening 10 are provided at the distal end of the push rod 6. The bayonet 4 and the opening 10 are located at the upper and lower ends along the radial direction of the push rod 6, respectively. That is, the bayonet 4 and the opening 10 are respectively opened on the side walls at the upper and lower ends of the push rod 6 in the radial direction, and the projection of the bayonet 4 is completely located on the projection of the opening 10. The spring coil 2 is located at the distal end of the push rod 6, and one end of the spring coil 2 is connected to a connector 5, which is located outside the spring coil 2.

[0035] It is understandable that the user's operating end is the proximal end, while the implanted end is the distal end.

[0036] It is understood that the spring coil 2 is connected to the connector 5 via a connecting rod (not shown in the figure). One end of the connecting rod extends into the spring coil 2 and is connected to the spring coil 2, while the other end is connected to the connector 5.

[0037] It is understandable that the purpose of the projection of the bayonet 4 being completely located on the projection of the open opening 10 is to allow the connector 5, which is locked in the bayonet 4, to disengage from the bayonet 4 through the open opening 10, thereby allowing the spring ring 2 and the push rod 6 to disengage from the connected state and enter the released state. The specific implementation principle of the connector 5 disengaging from the bayonet 4 through the open opening 10 will be explained later.

[0038] For example, the other end of the spring coil 2 is connected to a ball head 1, a portion of which is inserted into the spring coil 2 and connected to the spring.

[0039] Understandably, for ease of insertion of the push rod 6 into the target, a circular cross-section is best for the push rod 6. Of course, depending on the actual use, it can also be other shapes, such as an elliptical cross-section or other irregular shapes with curvature.

[0040] One end of the baffle 3 extends into the cavity of the push rod 6, and the baffle 3 can slide along the axial direction of the push rod 6 within the cavity of the push rod 6. The other end of the baffle 3 is located inside the opening 10 and is connected to the release wire 11, which is arranged along the axial direction of the push rod 6 and extends out from the proximal end of the push rod 6.

[0041] refer to Figure 4 Understandably, in order to allow the baffle 3 to slide more smoothly and evenly within the cavity of the push rod 6, the shape of the baffle 3 is adapted to the side wall of the push rod 6. For example, the baffle 3 is configured as an arc shape with grooves. Furthermore, configuring the baffle 3 as an arc shape with grooves can also increase the shear stress that the baffle 3 can withstand when subjected to radial forces, preventing misalignment caused by deformation of the baffle 3.

[0042] For example, it also includes an end head 9, one end of the release wire 11 extending from the proximal end of the push rod 6 is fixedly connected to the end head 9, and the end head 9 is attached to the end face of the proximal end of the push rod 6.

[0043] The purpose of setting end 9 is to seal the right-angled edge of the push rod 6 end face and the exposed release wire 11, so as to prevent the sharp edge from causing damage to the instrument or the surgeon during the operation.

[0044] For example, the push rod 6 also has an injection port 8 for injecting bonding material on its side wall, and the injection port 8 is located near the end of the push rod 6. Bonding material is injected into the cavity of the push rod 6 through the injection port 8. The bonding material flows axially towards both ends within the cavity. The bonding material flowing out towards the end face near the end of the push rod 6 forms an end head 9 with an arc-shaped outer contour and wraps around the release wire 11, thereby fixing the release wire 11 to the end head 9. Forming an end head 9 with an arc-shaped outer contour also ensures a larger contact area between the release wire 11, the push rod 6, and the bonding material, thereby improving the adhesion.

[0045] It is understandable that the bonding material used for injection can be existing materials, such as adhesives, solders, etc. This type of bonding material can flow after injection and form end 9 to ensure a more robust and stable connection with the release wire 11 and prevent the release wire 11 from separating from the push rod 6.

[0046] For example, the push rod 6 is also provided with a break cut 7 to facilitate breaking the push rod 6, the break cut 7 being close to the proximal end of the push rod 6. When release is required to complete the release, the push rod 6 is broken by breaking the break cut 7.

[0047] The break-off notch 7 can be a break-off groove or an intermittent perforation. The break-off groove is arranged around the circumference of the push rod 6, and the intermittent perforations are also arranged around the circumference of the push rod 6 to make it easier to break the push rod 6.

[0048] The spring coil 2 is connected to the push rod 6 via the connector 5. In the limited state, one end of the baffle 3 extends out of the cavity of the push rod 6 and is located inside the opening 10. The connector 5 is engaged in the bayonet 4, so that the bayonet 4 limits the connector 5 and the baffle 3 along the axial direction of the push rod 6. That is, the baffle 3 and the bayonet 4 together hold the connector 5 in the bayonet 4, so that the connector 5 cannot move freely in either the radial or axial direction of the push rod 6, and thus cannot disengage from the bayonet 4. This keeps the spring coil 2 connected to the push rod 6, and the spring coil 2 cannot disengage from the push rod 6. In the released state, the baffle 3 extends completely into the cavity of the push rod 6, exposing the opening 10. This allows the baffle 3 to no longer limit the connector 5, and the connector 5 can move radially along the push rod 6 towards the opening 10, and disengage from the opening 10. The connector 5 is disengaged from the bayonet 4 and the baffle 3.

[0049] It is understood that the shape of the connector 5 is not limited, as long as it can be secured within the bayonet 4. Similarly, the shape of the bayonet 4 is also not limited. (Reference) Figures 5-8 This invention illustrates two shapes of connector 5, one of which is spherical and the other is rectangular. Of course, connector 5 can also be other shapes, which will not be exemplified here.

[0050] Understandably, since the projection of the bayonet 4 is completely located on the projection of the open opening 10, when in the limited position, the lower end of the connector 5 abuts against the baffle 3, thereby allowing the baffle 3 to limit the connector 5 radially along the push rod 6, locking the connector 5 inside the bayonet 4. The connector 5 is locked inside the bayonet 4 in the following two ways: In the first case, the upper end of the connector 5 extends into the bayonet 4, and the upper end of the connector 5 is lower than or flush with the top of the opening (that is, the outer surface of the side wall of the radially upper end of the push rod 6); In the second case, the upper end of the connector 5 is higher than the top of the opening and is located outside the opening.

[0051] For example, it also includes a stop 12, which is located in the cavity of the push rod 6. The stop 12 abuts against the baffle 3 and is limited to the baffle 3 to prevent the baffle 3 from flipping.

[0052] The purpose of setting the stop 12 is to prevent the baffle 3 from flipping. The reason the baffle 3 might flip is that during the insertion of the mechanical release spring coil structure, the spring coil 2 is inevitably subjected to compression by the packing force (due to the reaction force from the packing), causing the connector 5 to exert a compressive force towards the opening 10. This compressive force causes the baffle 3 to flip towards the opening 10, resulting in the connector 5 becoming loose within the bayonet 4, thus loosening the limiting position on the connector 5. This loosening may cause the spring coil 2 to detach. Therefore, by setting the stop 12, this situation can be avoided.

[0053] It is understandable that the shape of the stop 12 is not limited, as long as the stop 12 can abut against the baffle 3 and limit the baffle 3. (Reference) Figures 6-8 The diagram illustrates two shapes of the stop 12: one spherical and the other rectangular. However, the spherical stop 12 provides a better effect than the rectangular one. When the stop 12 is spherical, it can rotate within the cavity of the push rod 6, changing the friction between the stop 12 and the baffle 3 from sliding friction to rolling friction during the movement of the baffle 3, effectively reducing the release force of the stop 12.

[0054] For example, a limiting opening 13 is also provided on the side wall of the push rod 6. The upper end of the stop block 12 is locked in the limiting opening 13. The stop block 12 is locked in the limiting opening 13 through the limiting opening 13. While ensuring that the stop block 12 can rotate (when the stop block 12 is spherical), it is also limited to the stop block 12 to prevent the stop block 12 from moving.

[0055] refer to Figure 10 It is understandable that a notch 4 is cut into the side wall of the push rod 6, so that the end of the push rod 6 near the spring coil 2 forms a support part 41, which acts as a fulcrum. In the limited state, the connector 5 is locked in the notch 4, and the spring coil 2 is connected to the connector 5 through a connector. The two ends of the connector are respectively connected to the spring coil 2, the connector 5, and the support part 41 to form a lever, with the support part 41 serving as the fulcrum of the lever. During the implantation (i.e., packing) process, the spring coil 2 will be affected by the shape of the packing site and will produce different shapes, so that the spring coil 2 exerts a force F on itself during the implantation process. Figure 10 The direction of the force F shown is diagonally upward to the right. This force F can be decomposed into a radial force F1 and an axial force F2. Since forces are mutual, the force F2 and the force f2 on connector 5 will cancel each other out, so this will not be elaborated here. The radial force F1 is transmitted to connector 5 through the fulcrum, resulting in a radial force f1 on connector 5 as well.

[0056] In the limited position, the baffle 3 radially limits the connector 5 within the bayonet 4. When the baffle 3 is removed (i.e. extended into the cavity of the push rod 6), the connector 5, under the action of the force F1, is tilted downward out of the bayonet 4 by the support part 41, which acts as a fulcrum, and disengages from the bayonet 4 through the opening 10. This further ensures the stable disengagement of the connector 5 from the bayonet 4, further improves the stability of the disengagement, and avoids disengagement failure.

[0057] Of course, in actual use, due to the different shapes of the filling points, the force may also be generated in a downward and rightward direction, forming both a downward radial force and an axial force. This also creates a radial force on the connector 5, only this time the radial force on the connector 5 is downward. At this time, the edge of the baffle 3 near the spring coil 2 becomes a fulcrum. At this time, the baffle 3, as the fulcrum, may flip and tilt upward. To prevent tilting, a stop block 12 is provided, which presses down the baffle 3 to prevent flipping. Similarly, after the baffle 3 is removed, the connector 5 loses the limiting control of the baffle 3. Under the action of external force (this external force comes from the filling), the connector 5 falls out of the bayonet 4, thereby disengaging the connector 5 from the bayonet 4 and releasing the spring coil 2 and the push rod 6.

[0058] Compared to existing mechanically released spring coils 2, this invention provides a locking slot 4 and an open slot 10 at the distal end of the push rod 6, which cooperate with the baffle 3. In the limited state, the connector 5 is locked within the locking slot 4; in the released state, the connector 5 can easily disengage from the locking slot 4, thus releasing the spring coil 2 from the push rod 6. The open slot 10 increases the open area at the connection point between the spring coil 2 and the push rod 6, thereby reducing the contact area between the connection area of ​​the push rod 6 and the connector. This makes it easier for the connector and the connector 5 connected to it to fall out of the connection area, achieving separation of the spring coil 2 from the push rod 6, thus ensuring the stability of the release and avoiding situations where release is difficult or impossible. Furthermore, the stop 12 prevents the baffle 3 from flipping, further ensuring the stability of the release.

[0059] This invention enables quick and stable release of the spring coil 2 from the push rod 6. It maintains the integrity of the release area before release and reduces the contact area after release, thus reducing adhesion between the connector and the spring coil 2, enhancing the certainty of release, and improving the stability of release. Furthermore, its simple structure facilitates assembly and is beneficial for the processing and production of components.

[0060] The embodiments disclosed in this specification are merely illustrative of one aspect of the invention, and the scope of protection of the invention is not limited to these embodiments. Any other functionally equivalent embodiments fall within the scope of protection of the invention. Those skilled in the art can make various other corresponding changes and modifications based on the technical solutions and concepts described above, and all such changes and modifications should fall within the scope of protection of the claims of this invention.

Claims

1. A highly reliable mechanical release spring coil structure, characterized in that, include: The push rod is a hollow tubular shape. A bayonet and an open end are located at the distal end of the push rod, respectively, at the upper and lower ends along the radial direction. The projection of the bayonet falls entirely on the projection of the open end. A spring coil is located at the distal end of the push rod. One end of the spring coil is connected to a connector, which is located outside the spring coil. The spring coil is connected to the push rod through the connector. The release wire is positioned along the axial direction of the push rod and extends from the proximal end of the push rod. A baffle, one end of which extends into the cavity of the push rod and is connected to the release wire, and the baffle can slide along the axis of the push rod within the cavity of the push rod. In the limited position, the other end of the baffle extends out of the cavity of the push rod and is located inside the open opening. The connector is engaged in the bayonet, so that the bayonet limits the connector and the baffle along the axial direction of the push rod. In the released state, the baffle extends fully into the cavity of the push rod, exposing the opening. This allows the baffle to no longer be confined to the connector, enabling the connector to move radially along the push rod towards the opening and disengage from it. The connector is thus freed from the constraints of the bayonet and the baffle.

2. The high-reliability release mechanical release spring coil structure according to claim 1, characterized in that, The other end of the spring coil is connected to a ball head, part of which is inserted into the spring coil and connected to the spring.

3. The high-reliability release mechanical release spring coil structure according to claim 1, characterized in that, The shape of the baffle is adapted to the side wall of the push rod, and the baffle is an arc shape with grooves.

4. The high-reliability release mechanical release spring coil structure according to claim 1, characterized in that, It also includes an end cap, with the release wire extending from one end near the push rod and fixedly connected to the end cap, the end cap fitting against the end face near the push rod.

5. The high-reliability release mechanical release spring coil structure according to claim 1, characterized in that, An injection port for injecting connecting material is also provided on the side wall of the push rod, and the injection port is located near the end of the push rod. The connecting material is injected into the cavity of the push rod through the injection port and then flows out towards the end face of the push rod near the end, forming an end with an arc-shaped outer contour on the end face of the push rod, which wraps around the release wire.

6. The high-reliability release mechanical release spring coil structure according to claim 1, characterized in that, The push rod is also provided with a break cut to facilitate breaking the push rod, and the break cut is close to the proximal end of the push rod.

7. The high-reliability release mechanical release spring coil structure according to claim 6, characterized in that, The break-off cut is either a break-off groove or a series of intermittent perforations. The break-off groove is arranged around the circumference of the push rod, and the intermittent perforations are also arranged around the circumference of the push rod.

8. The high-reliability release mechanical release spring coil structure according to any one of claims 1-7, characterized in that, It also includes a stop block, which is located inside the cavity of the push rod. The stop block abuts against the baffle and is confined to the baffle to prevent the baffle from flipping over.

9. The high-reliability release mechanical release spring coil structure according to claim 8, characterized in that, The stop block is spherical, and a limiting opening is also provided on the side wall of the push rod, with the upper end of the stop block being engaged in the limiting opening.

10. The high-reliability release mechanical release spring coil structure according to claim 1, characterized in that, A slot is cut into the side wall of the push rod, so that the end of the push rod near the spring coil forms a support part. The support part acts as a fulcrum. In the limited state, the connector is locked in the slot, and the spring coil is connected to the connector through the connector. The two ends of the connector are respectively connected to the spring coil, the connector and the support part to form a lever. The support part acts as the fulcrum of the lever.

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