A molding tool

Abstract

The present invention discloses a molding tool, which includes a molding piece and an elastic sleeve. The molding piece has a connecting end suitable for inserting into a molding cavity of a component molding mold; the elastic sleeve is fixed on the outer periphery of the connecting end, suitable for separating the connecting end from the component being molded in the molding cavity; the elastic sleeve includes a first section arranged on the outer wall of the front end of the connecting end and a second section adjacent to the first section, the outer diameter of the first section is greater than the outer diameter of the second section; a limiting structure is arranged between the connecting end of the molding piece and the elastic sleeve, and limits the relative movement of the elastic sleeve relative to the connecting end. With such a design, after the glue injection molding is formed, the molding tool can be taken out of the molding cavity of the component molding mold as a whole because the elastic sleeve itself has the characteristics of flexibility and deformation, and the removal operation is more convenient. Moreover, the molding tool is also a whole after being taken out, which is not only convenient for cleaning, but also convenient for maintenance and reuse, saving material costs.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic medical equipment, and in particular to a molding tool. Background Art

[0002] An implantable cardiac pacemaker is an electronic therapeutic device that is implanted in the patient's body for a long time. It emits electrical pulses powered by a battery through a pulse generator, which are conducted through electrode wires to stimulate the myocardium that the electrodes contact, causing the heart to become excited and contracted, thereby achieving the purpose of treating heart dysfunction caused by certain arrhythmias.

[0003] Implantable pacemakers are medical devices that are implanted in the human body for a long time and need to operate safely and stably. The conductivity and sealing of the connection parts of each part need to be guaranteed. The sealing system of the implantable pacemaker is the guarantee for the function of the pacemaker. If the sealing system of the implantable pacemaker is unreliable, it will affect the transmission of the pacing signal, and in severe cases, it will cause a short circuit between the positive and negative poles of the circuit, affecting the life of the pacemaker battery.

[0004] At present, there are three main sealing systems for implantable cardiac pacemakers. The first is the sealing of the metal shell of the pulse generator, which can be achieved by the existing laser welding technology; the second is the sealing of the electrode cavity and the electrode plug of the polymer material connector. Here, the sealing structure is set on the electrode plug, which is a standard structural seal and does not have too many problems; the third is the key point of the sealing problem at this stage, that is, the sealing of the electrode plug and the connector (insert). Here, the sealing structure requires that the torque wrench can be inserted and removed conveniently and quickly, and the set screws can be tightened and loosened, and the sealing device (sealing plug) must not be damaged, and the sealing device (sealing plug) must not move or fall off. Therefore, the surface finish of the sealing cavity molding is high, and there must be a structure that can be positioned. Whether it is an integral molding cavity or a split molding cavity, the processing technology is difficult and the sealing cavity is easily damaged.

[0005] In order to prevent the fastening screws from short-circuiting through the body fluids or blood after the pacemaker is implanted in the human body and affecting the normal operation of the device, the existing method is to install a sealing device on the outside of the fastening screw for protection and insulation. One method is to install a sealing plug in the normally opened sealing groove, and then use a medical silicone adhesive to adhere the sealing plug to the connector to prevent the sealing plug from falling off and ensure the sealing performance. Another method is to form a sealing cavity with an inverted T shape, position the sealing plug through a structure that is small on the outside and large on the inside, and use the local overpressure of the sealing plug to achieve sealing.

[0006] Patent No. CN107596563A discloses a method for molding a cylindrical sealing cavity: when molding the epoxy resin top of an implantable cardiac pacemaker, first a polytetrafluoroethylene tube is used to make a process ring, a liquid silicone rubber material is used to make a gasket, and a positioning pin is used as a mold core; then the process ring is sleeved on the lower part of the positioning pin, and the gasket is sleeved on the lower end of the positioning pin; then the positioning pin is installed in the fixing screw hole of the connector through the threaded head at its lower end, ensuring that the process ring is in close contact with the gasket and the contact surfaces of the connector, and longitudinally molding it into an inverted "T"-shaped cylindrical sealing cavity, and after the molding is completed, the positioning pin, the process ring and the gasket are withdrawn from the epoxy resin top. The positioning pins, process rings and washers are scattered independently and may fall off during installation, affecting the product yield. They need to be assembled together when the connector is molded, which increases the assembly process. The removal is also done in steps, which is cumbersome. After the three materials are assembled, there may be an assembly gap, which will cause bubbles to form when the epoxy resin connector is cured, affecting the appearance of the connector. If the bubbles are too large, the entire pulse generator will be scrapped. At the same time, the cumulative gap will also cause the cumulative tolerance of the T-shaped sealing cavity to be too large and the size to be unstable. Summary of the invention

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the molding tool for molding the inverted T-shaped sealing cavity of the pacemaker connector in the prior art, such as the large number of parts, multiple assembly processes, complicated removal steps, and the existence of assembly gaps that affect the molding quality of the pacemaker connector, thereby providing a molding tool.

[0008] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0009] A molding tool, comprising:

[0010] A molded part having a connection end adapted to be inserted into a molding cavity of a component molding mold;

[0011] An elastic sleeve is fixed on the outer periphery of the connecting end and is suitable for separating the connecting end from the component being formed in the forming cavity; the elastic sleeve comprises a first section arranged on the outer wall of the front end of the connecting end and a second section adjacent to the first section, the outer diameter of the first section is larger than the outer diameter of the second section; the first section is suitable for forming a first cavity with an opening at one end inside the component when the component is formed, and the second section is suitable for forming a second cavity communicating with the first cavity and having a smaller diameter than the first cavity inside the component when the component is formed;

[0012] A limiting structure is arranged between the connecting end of the molded part and the elastic sleeve to limit the relative movement of the elastic sleeve with respect to the connecting end.

[0013] Furthermore, a threaded section with external threads is provided on the frontmost end surface of the connecting end, and the threaded section is suitable for being threadedly connected to an insert with an internal threaded hole.

[0014] Furthermore, the outer diameter of the threaded section is smaller than the outer diameter of the end face of the connecting end, the end face of the connecting end constitutes a first limiting end face, and the insert is suitable for abutting against the first limiting end face.

[0015] Furthermore, the limiting structure includes a limiting rib arranged on the outer wall of the connecting end, and a limiting groove arranged on the inner wall of the elastic sleeve for cooperating with the limiting rib; the outer diameter of the limiting rib is smaller than the diameter of the opening on the second chamber.

[0016] Furthermore, the molded part is provided with a second limiting end surface arranged facing the elastic sleeve, and one end of the elastic sleeve away from the second section abuts against the second limiting end surface.

[0017] Furthermore, the limiting structure includes an adhesive arranged between the inner wall of the elastic sleeve and the outer wall of the connecting end.

[0018] Furthermore, the elastic sleeve is a silicone sleeve formed by injection molding of silicone material.

[0019] Furthermore, the molding piece is provided with a shoulder which abuts against an external positioning component to position the depth of the molding piece inserted into the molding cavity.

[0020] Furthermore, the molded part is a metal rod made of metal material.

[0021] On the other hand, the present invention also provides a method for forming a component having a sealed cavity with a small outer portion and a large inner portion, comprising the following steps:

[0022] S1, making molded parts and elastic sleeves;

[0023] S2, fixing the elastic sleeve on the outer periphery of the molded part to assemble the molded tool;

[0024] S3, inserting one end of the molding tool having the elastic sleeve into the molding cavity of the component molding mold;

[0025] S4, pouring and molding a component into a molding cavity of the component molding mold;

[0026] S5, after the component is solidified, the molding tool is taken out as a whole from the molding cavity of the component molding mold.

[0027] Furthermore, in step S1, the elastic sleeve includes a first section and a second section which are sequentially arranged along the insertion direction of the molded part, and the outer diameter of the first section is larger than the outer diameter of the second section; the first section is suitable for forming a first chamber with an opening at one end inside the component when the component is molded, and the second section is suitable for forming a second chamber which is connected with the first chamber and has a smaller diameter than the first chamber inside the component when the component is molded.

[0028] Furthermore, in step S1, the elastic sleeve is formed by injection molding of liquid silicone rubber.

[0029] Furthermore, before the step S2, the method further includes: cleaning the surfaces of the molded part and the elastic sleeve.

[0030] Furthermore, in the step S2, the elastic sleeve is fixed to the outer periphery of one end of the molded part by using an adhesive.

[0031] Furthermore, in step S1, the molded part is a metal threaded rod having an external thread at one end.

[0032] The technical solution of the present invention has the following advantages:

[0033] 1. The molding tool provided by the present invention fixes the elastic sleeve on the connecting end of the molding part to form an integral molding tool, and uses a limiting structure to limit the relative movement of the elastic sleeve on the connecting end. During the component molding process, the molding tool is inserted into the molding cavity of the component molding mold as a whole. The first section and the second section of the elastic sleeve can form a first chamber and a second chamber respectively inside the component. The second chamber is connected to the first chamber and has a smaller diameter than the first chamber. The second chamber has an opening. In this way, a sealed cavity with a small opening and a large interior can be formed in the component. After a sealing plug matching the shape of the sealed cavity is inserted into the sealed cavity, good sealing performance can be guaranteed. After the component is molded, since the elastic sleeve itself has the characteristics of flexibility and deformation, the molding tool can be taken out from the molding cavity of the component molding mold as a whole. Compared with the method of taking out the various parts of the molding tool in turn in the prior art, the removal operation is more convenient, and the molding tool is also a whole after being taken out, which is not only convenient for cleaning, but also convenient for maintenance and reuse, saving material costs.

[0034] 2. In the molding tool provided by the present invention, the threaded section at one end of the molded part is threadedly connected to the internal threaded hole of the insert, which can ensure the rigid connection between the molded part and the insert, and prevent the glue from overflowing into the internal threaded hole of the insert during the component molding, resulting in failure of electrical signal conduction.

[0035] 3. In the molding tool provided by the present invention, the end face of the connecting end constitutes a first limiting end face suitable for the insert to abut against, which can prevent the molding part from being inserted too deeply into the insert.

[0036] 4. In the molding tool provided by the present invention, the elastic sleeve is fixed on the outer periphery of the connecting end, and a concave-convex limiting structure is provided between the outer wall of the connecting end and the inner wall of the elastic sleeve; the concave-convex fitting connection method can achieve zero gap or a small amount of interference fit between the elastic sleeve and the connecting end of the molded part, effectively avoiding the problem of bubbles in the component caused by air in the gap during the curing process of the component, thereby affecting the quality of the component.

[0037] 5. In the molding tool provided by the present invention, the shoulder on the molding part can be abutted against the component molding mold to position the depth of the molding part inserted into the molding cavity.

[0038] 6. The molding tool provided by the present invention bonds the molded part and the elastic sleeve together with an adhesive, which can effectively ensure the matching of the threaded section on the molded part and the internal thread of the insert during component molding, and can also form an inverted T-shaped structure through the flexibility of the elastic sleeve.

[0039] 7. The molding method of the component with a small outer and large inner sealed cavity provided by the present invention, before molding the component, fix the elastic sleeve on the connecting end of the molded part to form an integral molding tool, simplify the preparation and assembly process before the component is molded by glue pouring, and improve the efficiency of the component during the glue pouring process. The component with a small outer and large inner sealed cavity has fewer molded parts, and it is easy to disassemble and remove as an integral part, and it is easy to clean after taking it out; compared with the structure without a small outer and large inner sealed cavity, the structure and molding method of the present invention do not require glue dispensing and curing, simplifying the process and time of the later stage; it is convenient for maintenance, can be reused, and saves material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 This is a schematic diagram of the structure of the epoxy resin connector sealing plug of the pacemaker in an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of a half-section structure of a molding tool in Embodiment 1 of the present invention;

[0043] Figure 3 It is a schematic diagram of a half-section structure of a molding tool in the second embodiment of the present invention;

[0044] Figure 4 It is a schematic diagram of the three-dimensional structure of the molded parts in the first and second embodiments of the present invention;

[0045] Figure 5 This is a schematic diagram of a half-section structure of a molding tool in Embodiment 3 of the present invention;

[0046] Figure 6 A schematic diagram of the three-dimensional structure of the forming tooling in the third embodiment of the present invention.

[0047] Explanation of the reference numerals: 100, molded part; 101, shoulder; 102, connecting end; 103, threaded section; 104, first limiting end face; 105, second limiting end face; 106, cutting edge; 107, limiting rib; 200, elastic sleeve; 201, inner wall of elastic sleeve; 202, first section; 203, second section; 300, adhesive; 400, insert; 500, connector; 501, electrode cavity; 502, sealing cavity; 600, set screw; 700, sealing plug; 800, electrode plug. DETAILED DESCRIPTION

[0048] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] The hardware of the pulse generator of the pacemaker is mainly composed of components such as circuit module, battery, metal sealed shell and polymer material connector containing electrode connector (insert). The parts that are in direct contact with human tissue mainly include polymer material connector and metal sealed shell. The polymer material connector can be polyurethane, polysulfone, polycarbonate, epoxy resin, etc. The polymer material connector involved in this application is made of epoxy resin.

[0052] Implantable pacemakers are medical devices that are implanted in the human body for a long time and need to operate safely and stably. The conductivity and sealing of the connection parts of each part need to be guaranteed. The sealing system of the implantable pacemaker is the guarantee for the function of the pacemaker. If the sealing system of the implantable pacemaker is unreliable, it will affect the transmission of the pacing signal, and in severe cases, it will cause a short circuit between the positive and negative poles of the circuit, affecting the life of the pacemaker battery.

[0053] At present, there are three main sealing systems for implantable cardiac pacemakers. The first is the sealing of the metal shell of the pulse generator, which can be achieved by the existing laser welding technology; the second is the sealing of the electrode cavity and the electrode plug of the epoxy resin connector. Here, the sealing structure is set on the electrode plug, which is a standard structural seal and does not have too many problems; the third is the key point of the sealing problem at this stage, that is, the sealing of the electrode plug and the connector (insert). Here, the sealing structure requires that the torque wrench can be inserted and removed conveniently and quickly, and the set screws can be tightened and loosened, and the sealing device (sealing plug) must not be damaged, and the sealing device (sealing plug) must not move or fall off. Therefore, the surface finish of the sealing cavity molding is high, and there must be a structure that can be positioned. Whether it is an integral molding cavity or a split molding cavity, the processing technology is difficult and the sealing cavity is easily damaged.

[0054] In order to prevent the fastening screw from short-circuiting through the body fluids or blood after the pacemaker is implanted in the human body and affecting the normal operation of the device, the existing method is to install a sealing device on the outside of the fastening screw for protection and insulation. One method is to form an inverted T-shaped sealing cavity on the connector, position the sealing plug through a small outer and large inner structure, and use the local overpressure of the sealing plug to achieve sealing.

[0055] The specific structure of the pacemaker epoxy resin connector 500 in the prior art is as follows: Figure 1 and Figure 2As shown, the electrical signal in the pulse generator is transmitted to the insert 400 through the guide wire, etc., and the electrode plug 800 is inserted into the electrode cavity 501. Since the fit between the insert 400 and the electrode plug 800 is a clearance fit, the set screw 600 is connected to the insert 400 through a thread, and then tightened to the electrode plug 800, so as to realize the electrical signal connection path between the insert 400 and the electrode plug 800. The sealing plug 700 is arranged on the upper part of the set screw 600 to prevent body fluid from penetrating into the electrode cavity 501 and causing circuit failure. The sealing plug 700 is made of implantable medical silicone rubber that meets biocompatibility.

[0056] In order to reduce the types of materials that come into contact with the human body, the sealing cavity 502 is made into an inverted T-shape with a small outside and a large inside. The small end of the sealing cavity 502 is over-pressure sealed with the small end of the sealing plug 700, and the large end of the sealing cavity 502 fixes the large end of the sealing plug 700 inside the connector 500, so there is no need to use medical silicone adhesive to fix the sealing plug 700 on the connector 500, which reduces the types of materials and the manufacturing process. The diameter of the small end of the sealing plug 700 is larger than the diameter of the small end of the sealing cavity 502, forming an over-pressure seal. The threaded structure in the insert 400 needs to be connected to the electrode wire, and no epoxy resin can penetrate inside. Therefore, when the sealing cavity 502 of the connector 500 is formed, a threaded section 103 that matches the internal thread of the insert 400 needs to be set on the molding tool inserted into the sealing cavity 502 to prevent the penetration of epoxy resin.

[0057] Since the epoxy resin used to make the connector 500 is a thermosetting resin, its shape cannot be changed once it is formed. The sealed cavity 502 is an inverted T-shaped cavity with a small outside and a large inside inside, and it is difficult to demold the cavity using hard materials. However, silicone material has elastic deformation ability, and silicone material is not sticky to epoxy resin, so silicone material can be used as a demolding material for molding the inverted T-shaped sealed cavity 502 with a small outside and a large inside.

[0058] In order to form the connector 500 having the above-mentioned small outer and large inner sealed cavity 502, the embodiment of the present invention provides a molding tool, such as Figure 2As shown in Figure 6, the molding tool includes a molding part 100 and an elastic sleeve 200; wherein the molding part 100 is a metal rod made of metal material, and the elastic sleeve 200 is a silicone sleeve formed by injection molding of silicone material. The molding part 100 has a connecting end 102 suitable for inserting into the molding cavity of the component molding mold; the elastic sleeve 200 is fixed on the outer periphery of the connecting end 102, and is suitable for separating the connecting end 102 from the component being molded in the molding cavity. The elastic sleeve 200 includes a first section 202 arranged on the outer wall of the front end part of the connecting end 102 and a second section 203 adjacent to the first section 202, and the outer diameter of the first section 202 is greater than the outer diameter of the second section 203; the first section 202 is suitable for molding a first cavity with an opening at one end inside the component when the component is molded, and the second section 203 is suitable for molding a second cavity communicating with the first cavity and having a smaller diameter than the first cavity inside the component when the component is molded; the opening of the second cavity is located on the surface of the molded component. A limiting structure is used between the connection end 102 of the molded part 100 and the elastic sleeve 200 to limit the relative movement of the elastic sleeve 200 with respect to the connection end 102 .

[0059] This molding tool fixes the elastic sleeve 200 on the connecting end 102 of the molded part 100 to form an integral molding tool, and uses a limiting structure to limit the relative movement of the elastic sleeve 200 on the connecting end 102. During the component molding process, the molding tool is inserted into the molding cavity of the component molding mold as a whole. The first section 202 and the second section 203 of the elastic sleeve 200 can form a first chamber and a second chamber respectively inside the component. The second chamber is connected to the first chamber and has a smaller diameter than the first chamber. The second chamber has an opening. In this way, a sealing cavity 502 with a small opening and a large interior can be formed in the component. After a sealing plug 700 matching the shape of the sealing cavity 502 is inserted into the sealing cavity 502, good sealing performance can be guaranteed. After the forming is completed, since the elastic sleeve 200 itself has the characteristics of flexibility and deformability, the molding tool can be taken out from the molding cavity of the component molding mold as a whole. Compared with the method of taking out the various parts of the molding tool one by one in the prior art, the removal operation is more convenient, and the molding tool is also a whole after being taken out, which is not only convenient for cleaning, but also convenient for maintenance and reuse, saving material costs. In addition, the size of the sealing cavity 502 is based on the size of a single elastic sleeve 200 part, without the accumulation of multiple materials and the risk of cumulative tolerances; and the elastic sleeve 200 is an injection molded part with a small dimensional tolerance range, and the sealing cavity 502 of the molded connector 500 can better cooperate with the sealing plug 700. Moreover, the outer wall of the injection-molded elastic sleeve 200 is smooth, and the sealing cavity 502 of the molded connector 500 is bright, with a good sealing effect.

[0060] In this embodiment, a threaded section 103 with external threads is further provided on the front end face of the connection end 102, and the threaded section 103 is suitable for being threadedly connected to the insert 400 with an internal thread hole. When the component is molded by glue pouring, the threaded section 103 at one end of the molded part 100 is threadedly connected to the internal thread hole of the insert 400, which can ensure the rigid connection between the molded part 100 and the insert 400, and prevent the glue from overflowing into the internal thread hole of the insert 400, resulting in failure of electrical signal conduction.

[0061] In this embodiment, the outer diameter of the threaded section 103 is smaller than the outer diameter of the end face of the connecting end 102. The end face of the connecting end 102 constitutes a first limiting end face 104. The insert 400 is suitable for abutting against the first limiting end face 104 to prevent the connecting end 102 from being inserted too deeply into the insert 400.

[0062] like Figure 2 As shown, in the first specific implementation of this embodiment, the limiting structure includes a limiting rib 107 provided on the outer wall of the connection end 102, and a limiting groove provided on the inner wall 201 of the elastic sleeve for cooperating with the limiting rib 107; the outer diameter of the limiting rib 107 is smaller than the diameter of the opening on the second chamber. The outer wall of the connection end 102 and the inner wall of the elastic sleeve 200 are connected in a concave-convex matching manner, which can achieve zero gap or a small amount of interference fit between the elastic sleeve 200 and the connection end 102, effectively avoiding the problem of bubbles in the component due to air in the gap during the curing process of the component, which affects the quality of the component.

[0063] Furthermore, the molded part 100 is provided with a second limiting end surface 105 facing the elastic sleeve 200 , and one end of the elastic sleeve 200 away from the second section 203 abuts against the second limiting end surface 105 , which can better limit the elastic sleeve 200 .

[0064] like Figure 3 As shown, in the second specific implementation of this embodiment, the limiting structure includes an adhesive 300 disposed between the inner wall of the elastic sleeve 200 and the outer wall of the connecting end 102. The molding 100 and the elastic sleeve 200 are bonded together by the adhesive 300, which can effectively ensure the matching of the threaded section 103 on the molding 100 and the inner thread of the insert 400 during the component molding, and can also be formed through the flexible inverted T-shaped structure of the elastic sleeve 200. The adhesive 300 effectively fills the gap between the connecting end 102 and the elastic sleeve 200, and no bubbles will overflow when the connector 500 is cured and formed, resulting in a poor appearance of the connector 500.

[0065] In this embodiment, the molded part 100 is provided with a shoulder 101 which abuts against an external positioning component to position the depth of the molded part 100 inserted into the molding cavity. The shoulder 101 can abut against the component molding mold to position the depth of the molded part 100 inserted into the molding cavity.

[0066] In this embodiment, the portion of the molded piece 100 extending out of the sealing cavity 502 is further provided with a cutting edge 106 to facilitate taking the molded piece 100 out of the connector 500 .

[0067] After the connector 500 is formed into an inverted T-shaped sealing cavity 502 with a small outside and a large inside, the sealing plug 700 can be easily inserted into the sealing cavity 502 with a small outside and a large inside by virtue of its excellent flexibility. The sealing plug 700 is only needed to achieve the sealing effect, and no glue point bonding process is needed, which reduces the production process, reduces the production cost, shortens the glue filling time cycle, and improves the finished product yield.

[0068] The application scope of this molding tool includes but is not limited to forming an inverted T-shaped sealing cavity 502 that is small on the outside and large on the inside on implantable cardiac pacemakers, implantable cardioverter defibrillators (ICDs), cardiac resynchronization therapy defibrillators (CRT-Ds), cardiac resynchronization therapy pacemakers (CRT-Ps), implantable brain pacemakers, implantable spinal cord stimulators, implantable sacral nerve stimulators, and implantable vagus nerve stimulators.

[0069] Embodiment 2

[0070] Embodiment 2 of the present invention provides a molding method for a component having a sealed cavity with a small outer portion and a large inner portion. The component may be a connector 500 of a pacemaker. The molding method comprises the following steps:

[0071] Step S1, manufacturing a molded part 100 and an elastic sleeve 200.

[0072] Specifically, the molded part 100 is a metal rod machined from a metal material and having an external thread at one end;

[0073] The elastic sleeve 200 is a silicone sleeve made of liquid silicone rubber. The molded part 100 has a connecting end 102 suitable for inserting into a molding cavity of a component molding mold, and a threaded section 103 with an external thread is also provided on the front end surface of the connecting end 102.

[0074] Step S2, the elastic sleeve 200 is sleeved and fixed on the outer periphery of the molded part 100 to assemble the molding tool.

[0075] The elastic sleeve 200 is fixed to the outer periphery of the connecting end 102 and is suitable for separating the connecting end 102 from the component being formed in the forming cavity. The elastic sleeve 200 includes a first section 202 disposed on the outer wall of the front end of the connecting end 102 and a second section 203 adjacent to the first section 202. The outer diameter of the first section 202 is greater than the outer diameter of the second section 203.

[0076] Specifically, the molded part 100 and the elastic sleeve 200 are bonded together with a silicone adhesive, which effectively ensures that the threaded section 103 on the molded part 100 and the internal thread of the insert 400 are matched when the connector 500 is formed, and the elastic sleeve 200 can be flexibly formed into an inverted T-shaped structure with a small outside and a large inside. A section of limiting convex rib 107 can also be made on the connection end 102 of the molded part 100 to limit the elastic sleeve 200. This method can eliminate the silicone adhesive between the molded part 100 and the elastic sleeve 200. It is worth noting that the molded part 100 and the elastic sleeve 200 need to be zero-fit or a small amount of interference fit to eliminate the assembly gap and prevent bubbles from being generated in the connector 500 when the epoxy resin is poured.

[0077] Furthermore, before executing step S2, the surfaces of the molded part 100 and the elastic sleeve 200 are cleaned to keep them clean.

[0078] Step S3, inserting one end of the molding tool with the elastic sleeve 200 into the molding cavity of the component molding mold.

[0079] Specifically, during the component molding process, the first section 202 of the elastic sleeve 200 is suitable for forming a first chamber with an opening at one end inside the component when the component is molded, and the second section 203 of the elastic sleeve 200 is suitable for forming a second chamber that is connected to the first chamber and has a smaller diameter than the first chamber inside the component when the component is molded; the opening of the second chamber is located on the surface of the molded component.

[0080] Step S4, pouring and molding the component into the molding cavity of the component molding mold.

[0081] Step S5, after the component is solidified, the molding tool is taken out as a whole from the molding cavity of the component molding mold.

[0082] In the molding method of the component with the sealed cavity 502 having a small outer portion and a large inner portion, before molding the component, the elastic sleeve 200 is fixed on the connecting end 102 of the molded part 100 to form an integral molding tool, which simplifies the preparation and assembly process before the component is molded by glue pouring, and improves the efficiency of the component during the glue pouring process. The component with the sealed cavity 502 having a small outer portion and a large inner portion has fewer molded parts, and is easy to disassemble and remove as an integral part, and is easy to clean after being removed. Compared with the structure without the sealed cavity having a small outer portion and a large inner portion, the structure and molding method of the present invention do not require dispensing and curing, which simplifies the process and time of the later stage; it is convenient for maintenance, can be reused, and saves material costs.

[0083] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled 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 list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A molding tool, characterized in that: include: A molded part (100) having a connection end (102) suitable for being inserted into a molding cavity of a component molding mold; An elastic sleeve (200) is fixed to the outer periphery of the connecting end (102) and is suitable for separating the connecting end (102) from the component being formed in the forming cavity; the elastic sleeve (200) comprises a first section (202) arranged on the outer wall of the front end portion of the connecting end (102) and a second section (203) adjacent to the first section (202); the outer diameter of the first section (202) is greater than the outer diameter of the second section (203); the first section (202) is suitable for forming a first cavity with an opening at one end inside the component when the component is formed, and the second section (203) is suitable for forming a second cavity communicating with the first cavity and having a smaller diameter than the first cavity inside the component when the component is formed; A limiting structure is arranged between the connecting end of the molded part (100) and the elastic sleeve (200) to limit the relative movement of the elastic sleeve (200) relative to the connecting end (102).

2. The molding tool according to claim 1, characterized in that: A threaded section (103) having an external thread is also provided on the front end surface of the connection end (102), and the threaded section (103) is suitable for being threadedly connected to an insert (400) having an internal threaded hole.

3. The molding tool according to claim 2, characterized in that: The outer diameter of the threaded section (103) is smaller than the outer diameter of the end face of the connecting end (102), the end face of the connecting end (102) constitutes a first limiting end face (104), and the insert (400) is suitable for abutting against the first limiting end face (104).

4. The molding tool according to any one of claims 1 to 3, characterized in that: The limiting structure comprises a limiting convex rib (107) arranged on the outer wall of the connecting end (102), and a limiting groove arranged on the inner wall of the elastic sleeve (200) for cooperating with the limiting convex rib (107); the outer diameter of the limiting convex rib (107) is smaller than the diameter of the opening on the second chamber.

5. The molding tool according to claim 4, characterized in that: The molded part (100) is provided with a second limiting end surface (105) arranged in a direction facing the elastic sleeve (200), and one end of the elastic sleeve (200) away from the second section (203) abuts against the second limiting end surface (105).

6. The molding tool according to any one of claims 1 to 3, characterized in that: The limiting structure comprises an adhesive (300) arranged between the inner wall of the elastic sleeve (200) and the outer wall of the connecting end (102).

7. The molding tool according to claim 1, characterized in that: The elastic sleeve (200) is a silicone sleeve formed by injection molding of silicone material.

8. The molding tool according to claim 1, characterized in that: The molding part (100) is provided with a shoulder (101) which abuts against an external positioning component to position the depth of the molding part (100) inserted into the molding cavity.

9. The molding tool according to claim 1, characterized in that: The molded part (100) is a metal rod made of metal material.

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