An assembly tooling for a conical coil spring and an assembly method for the conical coil spring

Abstract

The present disclosure provides an assembly tooling for an inclined coil spring and an assembly method for the inclined coil spring, belonging to the technical field of implantable medical devices. Among them, the assembly tooling includes: an introduction seat, the introduction seat has a through introduction cavity, and the introduction cavity includes an insertion end, an extension end, and a reduced-diameter cavity between the insertion end and the extension end; the reduced-diameter cavity is used for radially flattening the inclined coil spring; a support seat, the support seat has a step inserted into the central hole of the electrical contact, and the height of the step is less than or equal to the length between the first end of the central hole of the electrical contact and the installation position of the inclined coil spring; a ejector rod, having a rod body adapted to be inserted into the introduction cavity. The assembly tooling of the present disclosure can assemble the inclined coil spring into the housing of the electrical contact by the cooperative action of three parts, which is not only simple in structure, but also fast in assembly and not easy to damage the inclined coil spring.

Description

Technical Field

[0001] The present disclosure relates to the technical field of implantable medical devices, and particularly to an assembly tool for a helical coil spring and an assembly method for the helical coil spring. Background Art

[0002] In the field of implantable medical devices, nerve stimulators and cardiac stimulators include a pulse generator and an electrode lead wire. The pulse generator includes a plurality of electrical contacts, and the electrical contacts include: a metal housing and a helical coil spring accommodated in the metal housing.

[0003] The electrical contacts used in medical devices have relatively high requirements for volume and insertion and extraction forces. Generally, the helical coil spring and the metal housing are processed separately, and then the spring is placed into the metal housing. The wire diameter and size of the helical coil spring are relatively small, generally only 0.05 - 0.15 mm, and it is not resistant to external pressure. Therefore, placing the helical coil spring into the metal housing is a matter that tests the manufacturing process.

[0004] Disclosure Content

[0005] Therefore, the technical problem to be solved by the present disclosure is to overcome the defect that the assembly of the helical coil spring in the electrical contact for medical devices in the prior art is relatively difficult, so as to provide an assembly tool that can conveniently and quickly place the helical coil spring into the metal housing of the electrical contact and an assembly method for assembling the helical coil spring using the assembly tool.

[0006] To solve the above technical problem, the present disclosure provides an assembly tool for a helical coil spring, including:

[0007] An introduction seat, the introduction seat has a through introduction cavity, and the introduction cavity includes an insertion end, an extension end, and a variable diameter cavity between the insertion end and the extension end; the variable diameter cavity is used for radially flattening the helical coil spring, and the extension end is used for docking with the second end of the central hole of the electrical contact;

[0008] A support seat, the support seat has a step inserted into the central hole of the electrical contact, and the height of the step is less than or equal to the length between the first end of the central hole of the electrical contact and the installation position of the helical coil spring;

[0009] A push rod, having a rod body adapted to be inserted into the introduction cavity.

[0010] As a preferred solution, the insertion end has a hole greater than or equal to the radial projection of the helical coil spring; the extension end is docked with the central hole of the electrical contact and has a hole less than or equal to the projection of the central hole of the electrical contact; the radial cross-sectional area of the variable diameter cavity gradually decreases in the direction towards the extension end.

[0011] As a preferred solution, the hole at the insertion end of the insertion cavity is a combination of a circular hole and a long strip hole with the same center point. Both ends of the long strip hole extend out of the circular hole. The long strip hole is adapted to insert the conical coil spring, and the circular hole is adapted to insert the ejector rod.

[0012] As a preferred solution, the long strip hole extends along the direction of the insertion cavity towards the extending end. The length of the long strip hole gradually decreases along the variable diameter cavity. The channel formed by the extending path of the long strip hole in the variable diameter cavity includes a conical channel;

[0013] When the circular hole extends along the direction of the insertion cavity towards the extending end, the diameter of the circular hole remains unchanged. The channel formed by the extending path of the circular hole in the insertion cavity is a circular channel.

[0014] As a preferred solution, the insertion seat is made of a transparent material.

[0015] As a preferred solution, the insertion seat is provided with a circular slot at the extending end of the insertion cavity. The inner diameter of the circular slot is equal to the outer diameter of the housing of the electrical contact.

[0016] As a preferred solution, the ejector rod further has a rod handle. The rod handle is connected to one end of the rod body. The diameter of the rod handle is greater than the diameter of the circular channel of the insertion cavity.

[0017] As a preferred solution, the length of the circular channel of the insertion cavity is L1, the length from the second end of the central hole of the electrical contact to the installation position of the conical coil spring is L2, and the length of the rod body is less than or equal to the length of L1 + L2.

[0018] As a preferred solution, the range where the length of the rod body is less than the length of L1 + L2 is: 0.05 - 0.1 mm.

[0019] The present disclosure also provides an assembly method for a conical coil spring. Using the assembly tooling for the conical coil spring described in any one of the above solutions, it includes the following steps:

[0020] Insert the first end of the central hole of the electrical contact into the step of the support seat, and dock the second end of the central hole of the electrical contact with the extending end of the insertion cavity of the insertion seat;

[0021] Place the conical coil spring into the insertion end of the insertion cavity of the insertion seat;

[0022] Insert the end of the rod body of the ejector rod into the insertion end of the insertion cavity, and push forward against the conical coil spring to make the conical coil spring enter the central hole of the electrical contact and contact the step of the support seat;

[0023] The conical coil spring is overturned by contacting the step of the support seat, and thus enters the conical coil spring installation position of the electrical contact.

[0024] The technical solution of the present disclosure has the following advantages:

[0025] 1. The assembly tooling for the helical coil spring provided by the present disclosure uses three parts to cooperate, and the helical coil spring can be assembled into the housing of the electrical contact. It not only has a simple structure, but also is fast in assembly and not easy to damage the helical coil spring. One end of the insertion cavity of the guiding seat of the present disclosure has a larger cross-sectional projection of the hole, which is used to facilitate the placement of the helical coil spring into the insertion cavity. The other end of the insertion cavity has a smaller cross-sectional projection of the hole, which is used to guide the helical coil spring into the central hole of the electrical contact. After being deformed in the insertion cavity, the helical coil spring can smoothly enter the central hole of the electrical contact, and then under the combined action of the step of the supporting seat and the ejector rod, the helical coil spring can be smoothly assembled to the installation position of the helical coil spring of the electrical contact.

[0026] 2. The assembly tooling for the helical coil spring provided by the present disclosure, the cross-section of the insertion end of the insertion cavity of the guiding seat is a combination of a circular hole and a long strip hole with the same center point. The long strip hole is used to facilitate the insertion of the helical coil spring, and the circular hole is used to facilitate the insertion of the ejector rod. By inserting the ejector rod, under the action of the long strip hole with a gradually decreasing length, the helical coil spring gradually changes from a circle to an ellipse, so as to facilitate entering the central hole of the electrical contact.

[0027] 3. The assembly tooling for the helical coil spring provided by the present disclosure, the guiding seat is made of a transparent material, specifically, it can be made of a polymer material, such as plexiglass, etc. Using a transparent material can observe in real time during the assembly process of the helical coil spring. By dynamically monitoring the process of the helical coil spring changing from a circle to an ellipse, it can play a role in quality control and avoid the spring deformation not being detected.

[0028] 4. The assembly tooling for the helical coil spring provided by the present disclosure is provided with a circular slot at the protruding end of the insertion cavity of the guiding seat. Through this circular slot, the housing of the electrical contact is inserted, so as to fix the housing of the electrical contact on the guiding seat, which is convenient for the assembly of the helical coil spring; in addition, after fixing the housing of the electrical contact on the guiding seat, by designing the length of the rod body, the protection of the helical coil spring can be improved, and the helical coil spring can be prevented from being damaged by the too long rod body.

[0029] 5. The assembly method of the helical coil spring provided by the present disclosure, through the assembly tooling of any of the above solutions, when assembling the helical coil spring into the housing of the electrical contact, the instability of manual operation can be avoided. During the assembly process, through simple operations, the assembly of the helical coil spring can be completed, and the deformation and damage of the spring can be avoided to the greatest extent, ensuring the quality of the electrical contact. Description of the Drawings

[0030] To more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is an exploded perspective view of a three-dimensional structure of an embodiment of the assembly tooling for the helical coil spring of the present disclosure.

[0032] Figure 2 is Figure 1 longitudinal sectional schematic view of.

[0033] Figure 3 is Figure 1 front view sectional view of.

[0034] Figure 4 It is a three-dimensional structure schematic view of the helical coil spring.

[0035] Figure 5 It is a three-dimensional structure schematic view of the electrical contact member.

[0036] Figure 6 is Figure 5 longitudinal sectional schematic view of the electrical contact member of.

[0037] Figure 7 It is a front view sectional view of inserting the helical coil spring into the insertion end of the introduction cavity.

[0038] Figure 8 It is a front view sectional view of using a push rod to press down the helical coil spring in the introduction cavity.

[0039] Figure 9 It is a front view sectional view of pressing the helical coil spring into the helical coil spring installation position of the electrical contact member.

[0040] Explanation of reference numerals:

[0041] 1. Introduction seat; 2. Support seat; 3. Push rod; 4. Insertion end; 5. Circular slot; 6. Conical channel; 7. Circular channel; 8. Step; 9. Electrical contact member; 10. First end; 11. Helical coil spring installation position; 12. Second end; 13. Rod body; 14. Rod handle; 15. Helical coil spring. Specific embodiments

[0042] The technical solutions of the present disclosure will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

[0043] In the description of the present disclosure, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present disclosure. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0044] In the description of the present disclosure, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

[0045] In addition, the technical features involved in different embodiments of the present disclosure described below can be combined with each other as long as they do not conflict with each other.

[0046] Embodiment 1

[0047] This embodiment provides a specific implementation manner of an assembly tooling for assembling the inclined coil spring 15 into the interior of the electrical contact 9, as Figure 1As shown, it includes an inlet seat 1, a support seat 2, and a push rod 3. Among them, the inlet seat 1 is made of a transparent material. The center of the inlet seat 1 has an inlet cavity. One end of the inlet cavity is an insertion end 4, and the insertion end 4 has a hole with a diameter greater than or equal to the radial projection of the conical coil spring 15. For example, if the hole at the insertion end 4 is circular, the diameter of the hole is greater than or equal to the maximum outer diameter of the conical coil spring 15. Therefore, the conical coil spring 15 is suitable for being inserted through the insertion end 4. The other end of the inlet cavity is an extension end, and the extension end has a hole with a diameter less than or equal to the projection of the central hole of the electrical contact 9. For example, if the hole at the extension end is circular, the diameter of the hole is less than or equal to the minimum aperture of the central hole of the electrical contact 9. Therefore, the extension end is suitable for docking with the central hole of the electrical contact 9. The cavity between the insertion end 4 and the extension end of the inlet cavity has a diameter-changing cavity, and the radial cross-sectional area of the diameter-changing cavity gradually decreases in the direction towards the extension end. The conical coil spring 15 is radially flattened through the diameter-changing cavity. Preferably, the hole at the insertion end 4 of the inlet cavity is a combination of a circular hole and a long strip hole with the same center point. The circular hole is suitable for inserting the push rod 3, and both ends of the long strip hole extend out of the circular hole. The length of the long strip hole is greater than the outer diameter of the conical coil spring 15, so that the long strip hole is suitable for inserting the conical coil spring 15.

[0048] As Figure 2 , Figure 3 shown, the long strip hole at the insertion end 4 of the inlet cavity of the inlet seat 1 extends along the direction of the inlet cavity towards the extension end, and the length of the long strip hole gradually decreases, so that the channel formed by the extension path of the long strip hole in the inlet seat 1 is a conical channel 6, and the taper of the conical channel 6 is 10°-15°. On the other hand, when the circular hole at the insertion end 4 of the inlet cavity of the inlet seat 1 extends along the direction of the inlet cavity towards the extension end, the diameter of the circular hole remains unchanged, and the channel formed by the extension path of the circular hole in the inlet seat 1 is a circular channel 7. Moreover, the end of the conical channel 6 and the inner wall of the circular channel 7 have a smooth transition. Specifically, this smooth transition can be a fillet with a radius in the range of 0.3-0.5 mm to prevent damage when the conical coil spring 15 passes through.

[0049] As Figure 2 shown, the support seat 2 has a step 8 suitable for being inserted into the central hole of the electrical contact 9. The height of the step 8 is slightly less than the length between the first end 10 of the central hole of the electrical contact 9 and the installation position 11 of the conical coil spring, specifically: less than 0.05-0.1 mm.

[0050] As Figure 2As shown, the ejector rod 3 has a rod body 13 adapted to be inserted into the guiding cavity, and also has a rod handle 14 connected to one end of the rod body 13. The diameter of the rod handle 14 is larger than the diameter of the circular channel 7 of the guiding cavity. The guiding seat 1 is provided with a circular slot 5 at the protruding end of the guiding cavity, and the inner diameter of the circular slot 5 is equal to the outer diameter of the housing of the electrical contact 9.

[0051] As Figure 3 shown, the length of the circular channel 7 of the guiding cavity is L1, the length from the second end 12 of the central hole of the electrical contact 9 to the inclined coil spring installation position 11 is L2, and the length of the rod body 13 is less than the length of L1 + L2. Specifically: the length of the rod body 13 is less than the length of L1 + L2 in the range of: 0.05 - 0.1 mm.

[0052] As Figure 4 shown, it is a three-dimensional view of the inclined coil spring 15. The inclined coil spring 15 is guaranteed to be in a circular state in the free state. During the process of being installed into the electrical contact 9, it needs to be first deformed into an elliptical state and then restored to a circular state within the electrical contact 9.

[0053] As Figure 5 shown, it is the housing of the electrical contact 9. The housing has a central through hole. One end of the central through hole is the first end 10, which is adapted to be inserted onto the step 8 of the support seat 2; the other end of the central through hole is the second end 12, which is adapted to be docked with the guiding cavity of the guiding seat 1.

[0054] As Figure 6 shown, in the middle of the central through hole of the electrical contact 9, there is an inclined coil spring installation position 11, where the inclined coil spring 15 can be restored to a circular state.

[0055] Embodiment 2

[0056] This embodiment provides an assembly method for the inclined coil spring 15. Using the assembly tooling described in Embodiment 1, the inclined coil spring 15 is assembled into the interior of the electrical contact 9, specifically including the following steps:

[0057] As Figure 7 shown, insert the first end 10 of the central hole of the electrical contact 9 into the step 8 of the support seat 2, and dock the second end 12 of the central hole of the electrical contact 9 with the protruding end of the guiding cavity of the guiding seat 1.

[0058] Then, place the inclined coil spring 15 into the insertion end 4 of the guiding cavity of the guiding seat 1.

[0059] As Figure 8 shown, insert the end of the rod body 13 of the ejector rod 3 into the insertion end 4 of the guiding cavity, and push forward against the inclined coil spring 15 to make the inclined coil spring 15 change from a circular shape to an elliptical shape within the guiding cavity.

[0060] As shown Figure 9 Continue to push the ejector rod 3 forward, so that the inclined coil spring 15 enters the central hole of the electrical contact 9 and contacts the step 8 of the support seat 2. After the inclined coil spring 15 contacts the step 8 of the support seat 2, it is turned over, so that the inclined coil spring 15 enters the inclined coil spring installation position 11 of the electrical contact 9.

[0061] Obviously, the above embodiments are only examples given for clear illustration, and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present disclosure.

Claims

1. An assembly tool for a helical coil spring, characterized in that, it includes: An introduction seat (1), the introduction seat (1) has a through introduction cavity, the introduction cavity includes an insertion end (4), an extension end, and a reduced-diameter cavity between the insertion end (4) and the extension end; the reduced-diameter cavity is used for radially flattening the helical coil spring (15), and the extension end is used for docking with the second end (12) of the central hole of the electrical contact member (9); the insertion end (4) has a hole greater than or equal to the radial projection of the helical coil spring (15); the extension end is docked with the central hole of the electrical contact member (9) and has a hole smaller than or equal to the projection of the central hole of the electrical contact member (9); the radial cross-sectional area of the reduced-diameter cavity gradually decreases in the direction towards the extension end; A support seat (2), the support seat (2) has a step (8) inserted into the central hole of the electrical contact member (9), and the height of the step (8) is 0.05 - 0.1 mm smaller than the length between the first end (10) of the central hole of the electrical contact member (9) and the helical coil spring installation position (11). When the helical coil spring (15) contacts the step (8) of the support seat (2), it is overturned, so that the helical coil spring (15) enters the helical coil spring installation position (11) of the electrical contact member (9); A ejector rod (3), having a rod body (13) adapted to be inserted into the introduction cavity; the hole at the insertion end (4) of the introduction cavity is a combination of a circular hole and a long slot with the same center point. The two ends of the long slot respectively extend out of the circular hole. The long slot is adapted to insert the helical coil spring (15), and the circular hole is adapted to insert the ejector rod (3). By inserting the ejector rod (3), the helical coil spring gradually changes from circular to oval under the action of the long slot with a gradually decreasing length, so as to facilitate entering the central hole of the electrical contact member (9). The long slot extends along the direction of the introduction cavity towards the extension end, and the length of the long slot gradually decreases along the reduced-diameter cavity. The channel formed by the extension path of the long slot in the reduced-diameter cavity includes a conical channel (6), and the taper of the conical channel (6) is 10° - 15°; When the circular hole extends along the direction of the introduction cavity towards the extension end, the diameter of the circular hole remains unchanged. The channel formed by the extension path of the circular hole in the introduction cavity is a circular channel (7), the length of the circular channel 7 is L1, and the length between the second end (12) of the central hole of the electrical contact member (9) and the helical coil spring installation position (11) is L2. The length of the rod body (13) is 0.05 - 0.1 mm smaller than the length of L1 + L2.

2. The assembly tool for a helical coil spring according to claim 1, characterized in that, the introduction seat (1) is made of a transparent material.

3. The assembly tool for a helical coil spring according to claim 2, characterized in that, the introduction seat (1) is provided with a circular slot (5) at the extension end of the introduction cavity, and the inner diameter of the circular slot (5) is equal to the outer diameter of the housing of the electrical contact member (9).

4. The assembly tool for a helical coil spring according to any one of claims 1 - 3, characterized in that, The ejector rod (3) further has a rod handle (14), the rod handle (14) is connected to one end of the rod body (13), and the diameter of the rod handle (14) is greater than the diameter of the circular channel (7) of the introduction cavity.

5. An assembly method for a helical coil spring, characterized in that using the assembly tooling for the helical coil spring according to any one of claims 1-4, comprising the following steps: Insert the first end (10) of the central hole of the electrical contact (9) into the step (8) of the support seat (2), and dock the second end (12) of the central hole of the electrical contact (9) with the protruding end of the introduction cavity of the introduction seat (1); Place the helical coil spring (15) into the insertion end (4) of the introduction cavity of the introduction seat (1); Insert the end of the rod body (13) of the ejector rod (3) into the insertion end (4) of the introduction cavity, and push forward against the helical coil spring (15) to make the helical coil spring (15) enter the central hole of the electrical contact (9) and contact the step (8) of the support seat (2); The helical coil spring (15) is overturned by contacting the step (8) of the support seat (2), so as to enter the helical coil spring installation position (11) of the electrical contact (9).

Images