Expandable test mold

Abstract

The utility model provides a strutting test mould, including holding rod, actuating component and two oppositely arranged bracing plate, holding rod includes the near end block that is provided at the far end and axial through inner cavity, actuating component includes drive piece, far end block and transmission structure, drive piece can be movably penetrated in holding rod inner cavity, drive piece is equipped with the far end block and transmission structure, and drive piece is equipped with the far end block and transmission structure, and the drive piece is equipped with the far end block and transmission structure. The near-end block and the far-end block are both in sliding connection with the two supporting plates, the transmission structure is in transmission connection with the far-end block and the driving part, the driving part is rotated to drive the far-end block to move towards or away from the near-end block, and the two supporting plates are opened or closed accordingly. According to the expandable test mold, a doctor can accurately simulate the condition of an implant in a body only through one surgical instrument, test mold instruments with different specifications and sizes do not need to be frequently inserted and taken out in the surgical process, the surgical time can be shortened, damage to surrounding tissue can be avoided, and pain of a patient and surgical risks are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and more specifically, relates to an expandable trial mold. Background Art

[0002] Intervertebral fusion surgery is a surgical method for treating lumbar spine diseases. It is mainly used for lumbar spine diseases such as herniated disc, lumbar spinal stenosis, and degenerative lumbar instability. The fusion devices used in intervertebral fusion surgery include traditional fixed-size fusion devices as well as expandable fusion devices that have been introduced in recent years. Expandable fusion devices are suitable for minimally invasive endoscopic surgery. A working channel is established through a minimally invasive approach. While minimizing damage to surrounding tissues, the fusion device is implanted between the vertebrae using auxiliary instruments and tools. The intervertebral fusion surgery process involves establishing a minimally invasive channel to enter the diseased area, or performing open surgery to expose the diseased intervertebral disc and vertebral body, then cleaning the diseased area and implanting the fusion device in the intervertebral space. After the fusion device is implanted, it will fuse with the adjacent vertebrae to form a whole and stabilize the spine.

[0003] For traditional fixed-size intervertebral fusion devices, before implantation, trial molds of varying sizes, from small to large, are inserted, compared, and removed sequentially until the correct size is matched to the patient. This process should be evaluated under fluoroscopic imaging to determine the appropriate length and position of the final implant. However, current trial molds on the market have the following issues: Conventional trial molds have a height gradient that changes every 1mm. During surgery, trial molds of varying sizes must be frequently inserted and removed to compare the in vivo implant dimensions, increasing surgical time and causing significant damage to vertebral lamina tissue. Utility Model Content

[0004] The purpose of the utility model is to provide an expandable trial mold, which can adjust the size of the trial mold, so as to avoid the problem of frequent insertion and removal of trial mold instruments of different specifications and sizes for comparing the implant size data in the body during the operation, which leads to increased operation time and serious damage to the vertebral plate tissue.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: the present invention provides a test mold that can be expanded, including a holding rod, an actuating assembly and two supporting plates arranged opposite to each other;

[0006] The holding rod includes a proximal end block arranged at the distal end and an axially penetrating inner cavity;

[0007] The actuating assembly includes a driving member, a distal end block and a transmission structure. The driving member can be movably inserted into the inner cavity of the holding rod. The proximal end block and the distal end block are both slidably connected to the two support plates. The transmission structure is respectively connected to the distal end block and the driving member. Rotating the driving member can drive the distal end block to move toward or away from the proximal end block, and the two support plates are opened or closed accordingly.

[0008] In one embodiment, the driving rod comprises at least one first mark, and the first mark is used to display the height of the two support plates.

[0009] In one embodiment, the driving member includes at least one first mark, and the holding rod includes at least one second mark, and the second mark is used to cooperate with the first mark to display the height of the two support plates.

[0010] In one embodiment, the proximal end of the support plate is provided with a first guide structure that cooperates with the proximal end block, and the proximal end block is provided with a second guide structure that cooperates with the first guide structure;

[0011] The distal end of the support plate is provided with a third guide structure that cooperates with the distal end block, and the distal end blocks are each provided with a fourth guide structure that cooperates with the third guide structure;

[0012] The first guide structure and the third guide structure are protrusion structures, and the second guide structure and the fourth guide structure are groove structures.

[0013] In one embodiment, a fifth guide structure is provided in the middle of the support plate, and the fifth guide structure is used to guide the two support plates in the expansion direction; the fifth guide structure includes a first extension portion and a second extension portion located in the middle of the support plate, the first extension portion is a slide groove, and the second extension portion is a rib plate, and the two support plates are inserted into the slide groove through the rib plate to achieve movably connected.

[0014] In one embodiment, the transmission structure includes a threaded sleeve and a screw rod cooperating with the threaded sleeve, the threaded sleeve is fixed to the distal end of the proximal end block, the distal end block is rotatably connected to the distal end of the screw rod, and the proximal end of the screw rod is transmission-connected to the driving member.

[0015] In one embodiment, an annular groove is provided at the distal end of the screw, and a C-shaped retaining ring is provided in the groove for limiting the axial movement of the distal end block.

[0016] In one embodiment, the distal end of the driving member has a first matching portion, and the proximal end of the screw has a second matching portion that matches the first matching portion.

[0017] In one embodiment, the transmission structure includes a threaded sleeve and a screw rod cooperating with the threaded sleeve, the proximal end of the screw rod is threadedly connected to the distal end of the threaded sleeve, the proximal end of the threaded sleeve is transmission-connected to the driving member, the distal end block is fixedly connected to the distal end of the screw rod, and the threaded sleeve is rotationally connected to the proximal end block.

[0018] In one embodiment, the transmission structure further includes a positioning pin, a limiting hole is provided on the proximal end block, a limiting groove is provided at the proximal end of the threaded sleeve, and the positioning pin is passed through the limiting hole and is located in the limiting groove to prevent the threaded sleeve from moving axially relative to the proximal end block.

[0019] In one embodiment, the distal end of the driving member has a first matching portion, and the proximal end of the threaded sleeve has a second matching portion that matches the first matching portion.

[0020] The expandable test mold provided by the present invention includes a holding rod, an actuating assembly, and two support plates arranged opposite to each other. The holding rod includes a proximal end block arranged at the distal end and an inner cavity extending axially therethrough. The actuating assembly includes a driving member, a distal end block, and a transmission structure. The driving member can be movably inserted into the inner cavity of the holding rod. The proximal end block and the distal end block are both slidably connected to the two support plates. The transmission structure is respectively connected to the distal end block and the driving member. Rotating the driving member can drive the distal end block to move toward or away from the proximal end block, and the two support plates are then expanded or closed. The driving member of the expandable test mold can be movably inserted into the inner cavity of the holding rod. The driving member drives the distal end block toward the proximal end block through the transmission structure to expand the two support plates and adjust the height between the two support plates. The expandable test mold only requires one surgical instrument to enable the doctor to accurately simulate the situation of the implant in the body. There is no need to frequently insert and remove trial mold instruments of different specifications and sizes during the operation. This can shorten the operation time, avoid damage to surrounding tissues, and reduce the patient's pain and surgical risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic diagram of the closed state of the expandable test mold provided by the present invention;

[0023] Figure 2 A schematic diagram of the explosion structure of the test mold that can be expanded provided in the first embodiment of the present utility model;

[0024] Figure 3 A schematic diagram of the structure of a screw of a transmission structure capable of opening a test mold provided in the first embodiment of the present invention;

[0025] Figure 4 A schematic diagram of the partial structure of the distal end of the test mold that can be expanded provided in the first embodiment of the present utility model;

[0026] Figure 5 A schematic diagram of the partial structure of a driving member capable of opening a test mold provided in the first embodiment of the present utility model;

[0027] Figure 6 A schematic diagram of the explosion structure of the test mold that can be expanded provided in the second embodiment of the present utility model;

[0028] Figure 7 A schematic structural diagram of a threaded sleeve of a transmission structure capable of opening a test mold provided in the second embodiment of the present invention;

[0029] Figure 8 A schematic structural diagram of the proximal end block of the expandable test mold provided in the second embodiment of the present invention;

[0030] Figure 9 A schematic diagram of the partial structure of a holding rod capable of opening a test mold provided in the second embodiment of the present utility model;

[0031] Figure 10 A schematic diagram of the partial structure of a driving member capable of opening a test mold provided in the second embodiment of the present utility model;

[0032] Figure 11 A schematic diagram of the structure of the support plate that can support the test mold provided by the utility model;

[0033] Figure 12 This is a schematic structural diagram of the distal end block of the test mold that can be expanded provided by the utility model. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts shall fall within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "including" and "having" and any variations thereof used herein are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0036] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more.

[0038] The expandable test mold of the utility model comprises: a holding rod, an actuating assembly and two supporting plates arranged opposite to each other;

[0039] The holding rod includes a proximal end block arranged at the distal end and an axially penetrating inner cavity;

[0040] The actuating assembly includes a driving member, a distal end block and a transmission structure. The driving member can be movably inserted into the inner cavity of the holding rod. The proximal end block and the distal end block are both slidably connected to the two support plates. The transmission structure is respectively connected to the distal end block and the driving member. Rotating the driving member can drive the distal end block to move toward or away from the proximal end block, and the two support plates are opened or closed accordingly.

[0041] The driving member of the expandable trial mold of the utility model can be movably arranged in the inner cavity of the holding rod. The driving member drives the distal end block to move toward the proximal end block through the transmission structure to expand the two support plates and adjust the height between the two support plates. The expandable trial mold only requires one surgical instrument to enable the doctor to accurately simulate the situation of the implant in the body. There is no need to frequently insert and remove trial mold instruments with trial mold heads of different specifications and sizes during the operation, which can shorten the operation time, help avoid damage to surrounding tissues, and reduce the patient's pain and surgical risks.

[0042] The expandable mold provided by the present invention is described in detail below with reference to specific embodiments. In the following embodiments, the expandable mold is described as an expandable mold used in intervertebral fusion surgery, but this does not constitute a limitation on the scope of protection of the present invention.

[0043] In various embodiments of the present invention, the term "distal end" refers to the end away from the operator during a surgical procedure, and the term "proximal end" refers to the end closer to the operator during a surgical procedure. Unless otherwise defined, all technical and scientific terms used in this invention have the same meanings as commonly understood by those skilled in the art to which this invention belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this invention.

[0044] Example 1:

[0045] See also Figure 1 and Figure 2 The expandable test mold provided in this embodiment includes a holding rod 1, an actuating assembly 2 and two support plates 3 arranged opposite to each other, the holding rod 1 includes a proximal end block 11 arranged at the distal end and an axially extending inner cavity 12; the actuating assembly 2 includes a driving member 21, a distal end block 22 and a transmission structure, the driving member 21 can be movably passed through the inner cavity 12 of the holding rod 1, the proximal end block 11 and the distal end block 22 are both slidably connected to the two support plates 3, and the transmission structure is respectively connected to the distal end block 22 and the driving member 21, and rotating the driving member 21 can drive the distal end block 22 to move toward the proximal end block 11, and the two support plates 3 are then expanded, and rotating the driving member 21 in the opposite direction can drive the distal end block 22 to move away from the proximal end block 11, and the two support plates 3 can be closed.

[0046] The holding rod 1 of this embodiment is intended for handheld operation by a user. The material and size of the holding rod 1 are not particularly limited in this embodiment. The holding rod 1 of this embodiment includes a proximal end block 11 disposed at a distal end and an axially extending inner cavity 12. The driving member 21 of this embodiment is movably disposed within the inner cavity 12 of the holding rod 1. For example, the driving member 21 of this embodiment is a screwdriver rod that is movably sleeved within the inner cavity 12 of the holding rod 1.

[0047] The transmission structure of this embodiment includes a threaded sleeve 23 with an internal thread and a screw 24 inserted into the threaded sleeve 23. The screw 24 has an external thread. The threaded sleeve 23 is fixed to the distal end of the proximal end block 11. The distal end block 22 is rotatably connected to the distal end of the screw 24. The proximal end of the screw 24 is transmission-connected to the driving member 21.

[0048] The expansion mechanism of the expandable test mold of this embodiment is as follows: the proximal end of the threaded sleeve 23 is fixedly connected to the proximal end block 11, which is fixed to the distal end of the holding rod 1. The holding rod 1, the proximal end block 11, and the threaded sleeve 23 form a complete module and remain relatively fixed. The distal end of the driver 21 is in transmission connection with the proximal end of the screw rod 24. When the operator rotates the driver 21, the driver 21 is subjected to torque and engages with the screw rod 24. The screw rod 24 rotates, and the screw rod 24 and the threaded sleeve 23 are subjected to force, driving the distal end block 22 to move proximally. The driver 21 also moves proximally. The proximal movement of the distal end block 22 causes the upper and lower support plates 3 to move away from each other, expanding the two support plates 3 in the vertical direction. When the operator rotates the driver 21 in the opposite direction, the distal end block 22 moves away from the proximal end block 11, and the upper and lower support plates 3 move closer to each other, closing the two support plates 3 in the vertical direction.

[0049] Furthermore, Figure 3 For a schematic diagram of the structure of the screw of the transmission structure for opening the test mold provided in the first embodiment of the present invention, please refer to Figure 2 and Figure 3 The distal end of the screw 24 has an annular groove 241, within which is disposed a C-shaped retaining ring 25 for limiting axial movement of the distal end block 22. In this embodiment, the C-shaped retaining ring 25 is disposed at the distal end of the screw 24 to limit axial movement of the distal end block 22. In this embodiment, the distal end of the distal end block 22 is provided with an end cap 221 for protecting the C-shaped retaining ring 25.

[0050] The distal end of the driving member 21 of this embodiment has a first mating portion 212, and the proximal end of the screw rod 24 has a second mating portion 242 that mates with the first mating portion 212. The first mating portion 212 of the driving member 21 of this embodiment is in driving engagement with the second mating portion 242 of the screw rod 24. Optionally, the second mating portion 242 at the proximal end of the screw rod 24 of this embodiment is a hexagonal or plum blossom countersunk hole structure, while the first mating portion 212 at the distal end of the driving member 21 is a hexagonal or plum blossom structure.

[0051] During intervertebral fusion surgery, the effectiveness of the trial mold's expansion has a significant impact on the surgical outcome. The transmission structure of the expandable trial mold in this embodiment includes a threaded sleeve 23 and a screw 24 threaded within the sleeve 23. The two support plates 3, through the tight fit of the threaded sleeve 23 and the screw 24, ensure a stable expansion effect. During both insertion and removal of the trial mold in this embodiment, both support plates 3 are retracted, resulting in a smaller size and minimizing damage to surrounding tissues. After expansion, the two support plates 3 restore the height of the intervertebral disc space.

[0052] The adjustable distraction mold of this embodiment allows surgeons to more accurately simulate the in vivo conditions of the implant using only a single surgical instrument, eliminating the need for frequent insertion and removal of different-sized trial mold instruments during surgery. This allows for more precise control of the position and height of the intervertebral fusion cage, helping to avoid damage to surrounding tissues, reduce the risk of surgical complications, and ensure surgical success. This can also improve surgical efficiency, shorten operative time, and minimize patient pain and surgical risks.

[0053] Furthermore, Figure 4 This is a schematic diagram of the partial structure of the distal end of the test mold that can be expanded provided in the first embodiment of the present utility model. Figure 5 This is a partial structural diagram of the driving member that can open the test mold provided by the first embodiment of the present invention. Figure 2 、 Figure 4 and Figure 5 The driving member 21 of this embodiment includes at least one first marking 211, which is used to indicate the height of the two support plates 3 being expanded. When the driving member 21 of this embodiment is rotated, the driving member 21 moves proximally relative to the holding rod 1. The expanded height of the two support plates 3 can be determined by observing the relative position of the first marking 211 and the proximal end of the holding rod 1.

[0054] Conventional in-vivo test molds require frequent fluoroscopic imaging to assess the expansion status, but are unable to visually assess the expansion height of the support plates 3 in vitro, potentially causing radiation exposure to the surgeon. The expandable test mold of this embodiment allows surgeons to determine the expansion height of the two support plates 3 during surgery without the need for diagnostic equipment such as X-rays, thereby reducing or eliminating exposure to hazardous environments such as X-rays and improving surgical safety and success rates.

[0055] Optionally, the first marking 211 is a text, symbol, or pattern. For example, in this embodiment, the first marking 211 is a scale mark and a text mark. When the driver 21 is rotated, and the scale marks align with the end surface of the holding rod 1, the text mark corresponding to the scale mark indicates the extended height of the two support plates 3. In this embodiment, the driver 21 is provided with four scale marks, and the numerical marks corresponding to the scale marks correspond to the extended height of the support plates 3.

[0056] Example 2:

[0057] Figure 6 For the schematic diagram of the explosion structure of the test mold that can be opened provided by the second embodiment of the present invention, please refer to Figure 1 、 Figure 6The expandable test mold provided in this embodiment includes a holding rod 1, an actuating assembly 2 and two support plates 3 arranged opposite to each other, the holding rod 1 includes a proximal end block 11 arranged at the distal end and an axially extending inner cavity 12; the actuating assembly 2 includes a driving member 21, a distal end block 22 and a transmission structure, the driving member 21 can be movably passed through the inner cavity 12 of the holding rod 1, the proximal end block 11 and the distal end block 22 are both slidably connected to the two support plates 3, and the transmission structure is respectively connected to the distal end block 22 and the driving member 21, and rotating the driving member 21 can drive the distal end block 22 to move toward the proximal end block 11, and the two support plates 3 are then expanded, and rotating the driving member 21 in the opposite direction can drive the distal end block 22 to move away from the proximal end block 11, and the two support plates 3 can be closed.

[0058] The difference between the expandable test mold of this embodiment and the embodiment 1 is that the transmission structure includes a threaded sleeve 23 and a screw 24, the proximal end of the screw 24 is threadedly connected to the distal end of the threaded sleeve 23, the proximal end of the threaded sleeve 23 is transmission-connected to the driving member 21, the distal end block 22 is fixedly connected to the distal end of the screw 24, and the threaded sleeve 23 is rotationally connected to the proximal end block 11.

[0059] The expansion principle of the expandable test mold of this embodiment is as follows: the proximal end of the threaded sleeve 23 is transmission-connected with the driving member 21, and the operator rotates the driving member 21, and the driving member 21 is twisted by force and rotates in coordination with the threaded sleeve 23. Due to the axial limitation of the threaded sleeve 23, the distal end block 22 is fixedly connected to the distal end of the screw rod 24, and the screw rod 24 cannot rotate. During the rotation of the threaded sleeve 23, the screw rod 24 is forced to move toward the proximal end, and the movement of the screw rod 24 toward the proximal end drives the distal end block 22 to move toward the proximal end together. The movement of the distal end block 22 toward the proximal end causes the upper and lower support plates 3 to move away from each other, and the two support plates 3 are expanded in the height direction.

[0060] Furthermore, Figure 7 This is a structural diagram of a threaded sleeve of a transmission structure capable of opening a test mold provided by the second embodiment of the present invention. Figure 8 This is a schematic diagram of the structure of the proximal end block of the test mold that can be expanded according to the second embodiment of the present invention. Figure 6-Figure 8 The transmission structure further includes a positioning pin 26. The proximal end of the threaded sleeve 23 has a positioning groove 231. The proximal end block 11 is provided with a limiting hole 111. The positioning pin 26 is inserted into the limiting hole 111 and located in the positioning groove 231 to prevent the threaded sleeve 23 from axially moving relative to the proximal end block 11. In this embodiment, the positioning pin 26 cooperates with the positioning groove 231 on the threaded sleeve 23 to achieve axial limitation of the threaded sleeve 23, achieving relative rotation in the circumferential direction while preventing relative movement in the axial direction.

[0061] In this embodiment, the distal end of the driving member 21 has a first mating portion 212, and the proximal end of the threaded sleeve 23 has a second mating portion 232 that mates with the first mating portion 212. The first mating portion 212 of the driving member 21 of this embodiment is in driving engagement with the second mating portion 232 of the screw rod 24. Optionally, the second mating portion 232 at the proximal end of the screw rod 24 of this embodiment is a hexagonal or plum-shaped countersunk hole structure, and the first mating portion 212 at the distal end of the driving member 21 is a corresponding hexagonal or plum-shaped head structure.

[0062] The adjustable distraction mold of this embodiment allows surgeons to more accurately simulate the in vivo conditions of the implant using only a single surgical instrument, eliminating the need to frequently insert and remove different-sized trial mold instruments during surgery. This allows for more precise control of the position and height of the intervertebral fusion cage, helping to avoid damage to surrounding tissues, reduce the risk of surgical complications, and ensure surgical success. This can also improve surgical efficiency, shorten operative time, and minimize patient pain and surgical risks.

[0063] Figure 9 This is a partial structural diagram of a holding rod capable of opening a test mold provided by the second embodiment of the present utility model. Figure 10 This is a partial structural diagram of the driving member that can open the test mold provided by the second embodiment of the present invention. Figure 6 、 Figure 9 and Figure 10 Furthermore, the driving member 21 of this embodiment includes at least one first mark 211, and the holding rod 1 includes at least one second mark 13. The second mark 13 is used to cooperate with the first mark 211 to indicate the height of the two support plates 3. The first mark 211 of this embodiment is provided on the driving member 21. When the driving member 21 rotates circumferentially, the first mark 211 also rotates circumferentially relative to the holding rod 1. Through the cooperation of the first mark 211 and the second mark 13, the operator can know the number of rotations of the driving member 21 and, thereby, the height of the two support plates 3.

[0064] Optionally, the first mark 211 and the second mark 13 can be text, symbols or graphics. For example, the first mark 211 and the second mark 13 of this embodiment are both dots. In this embodiment, the number of the first mark 211 is one, and the number of the second marks 13 is four. The four second marks 13 are evenly distributed in the circumferential direction of the holding rod 1. When the two support plates 3 of the expandable test mold have not entered the body, the first mark 211 is aligned with the second mark 13. After the two support plates 3 enter between the vertebral bodies in the body, when the driving member 21 is rotated to adjust the expansion height between the two support plates 3, the expansion height of the two support plates 3 can be obtained by observing the number of rotations of the first mark 211 and the relative positions of the first mark 211 and the second mark 13.

[0065] Compared with ordinary trial molds, the expandable trial mold of this embodiment does not need to be frequently evaluated for expansion height under fluoroscopic imaging. The expansion height of the two support plates 3 can be understood in real time through the cooperation of the first mark 211 and the second mark 13 on the instrument in vitro, so that the doctor can reduce or avoid exposure to dangerous environments such as X-rays, thereby reducing the radiation dose of the surgeon.

[0066] Figure 11 This is a schematic diagram of the structure of the support plate that can support the test mold provided by the utility model. Figure 12 For a schematic diagram of the structure of the distal end block of the test mold provided by the present invention, please refer to Figure 8 and Figure 11 and Figure 12 In the above embodiment, the proximal end of the support plate 3 is provided with a first guide structure 31 that cooperates with the proximal end block 11, and the proximal end block 11 is provided with a second guide structure 112 that cooperates with the first guide structure 31. The distal end of the support plate 3 is provided with a third guide structure 32 that cooperates with the distal end block 22, and each distal end block 22 is provided with a fourth guide structure 221 that cooperates with the third guide structure 32. The first and third guide structures 31 and 32 are protrusions or grooves, and the second and fourth guide structures 112 and 221 are corresponding grooves or protrusions that cooperate therewith. Furthermore, in this embodiment, both the proximal end block 11 and the distal end block 22 have inclined surfaces that mate with the two support plates 3. As the distal end block 22 of this embodiment moves toward the proximal end block 11, the cooperation between the first guide structure 31, the second guide structure 112, the third guide structure 32, and the fourth guide structure 221 enables the two support plates 3 to be stably opened. The contact between the distal end block 22 and the proximal end block 11 and the two support plates 3 is surface contact, which further improves the stability of the support plates 3 during the expansion process.

[0067] Preferably, a fifth guide structure 33 is provided in the middle of the support plate 3. The fifth guide structure 33 is used to guide the two support plates 3 in the expansion direction. The fifth guide structure 33 includes a first extension portion 331 and a second extension portion 332 located in the middle of the support plate 3. Preferably, the first extension portion 331 is a slide groove, and the second extension portion 332 is a rib. The two support plates 3 are inserted into the slide groove by the rib to achieve a movable connection. The support plates 3 of this embodiment are provided with the fifth guide structure 33, which plays a guiding role during the relative movement of the two support plates 3, thereby preventing the support plates 3 from getting stuck or tilting during the expansion process.

[0068] See also Figure 2 and Figure 6 In the above embodiment, a handle 14 is provided at the proximal end of the holding rod 1, and the handle 14 is fixedly connected to the holding rod 1 through a pin 15 to facilitate the operator to hold it.

[0069] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A test mold that can be expanded, characterized in that: include: A holding rod, an actuating assembly, and two opposing support plates; The holding rod includes a proximal end block arranged at the distal end and an axially penetrating inner cavity; The actuating assembly includes a driving member, a distal end block and a transmission structure. The driving member can be movably inserted into the inner cavity of the holding rod. The proximal end block and the distal end block are both slidably connected to the two support plates. The transmission structure is respectively connected to the distal end block and the driving member. Rotating the driving member can drive the distal end block to move toward or away from the proximal end block, and the two support plates are opened or closed accordingly.

2. The expandable test mold according to claim 1, characterized in that: The driving member includes at least one first mark, and the first mark is used to display the height of the two support plates.

3. The expandable test mold according to claim 1, characterized in that: The driving member includes at least one first mark, and the holding rod includes at least one second mark, and the second mark is used to cooperate with the first mark to display the height of the two support plates.

4. The expandable test mold according to claim 1, characterized in that: The proximal end of the support plate is provided with a first guide structure that cooperates with the proximal end block, and the proximal end block is provided with a second guide structure that cooperates with the first guide structure; The distal end of the support plate is provided with a third guide structure that cooperates with the distal end block, and the distal end blocks are each provided with a fourth guide structure that cooperates with the third guide structure; The first guide structure and the third guide structure are protrusion structures, and the second guide structure and the fourth guide structure are groove structures.

5. The expandable test mold according to claim 4, characterized in that: A fifth guide structure is provided in the middle of the support plate, and the fifth guide structure is used to guide the two support plates in the expansion direction; the fifth guide structure includes a first extension part and a second extension part located in the middle of the support plate, the first extension part is a slide groove, and the second extension part is a rib plate, and the two support plates are inserted into the slide groove through the rib plate to realize movably connection.

6. The expandable test mold according to any one of claims 1 to 5, characterized in that: The transmission structure includes a threaded sleeve and a screw rod matched with the threaded sleeve, the threaded sleeve is fixed to the distal end of the proximal end block, the distal end block is rotatably connected to the distal end of the screw rod, and the proximal end of the screw rod is transmission-connected to the driving member.

7. The expandable test mold according to claim 6, characterized in that: The distal end of the screw is provided with an annular groove, and a C-shaped clamping ring is provided in the groove for limiting the axial movement of the distal end block.

8. The expandable test mold according to claim 6, characterized in that: The distal end of the driving member has a first matching portion, and the proximal end of the screw has a second matching portion that matches the first matching portion.

9. The expandable test mold according to any one of claims 1 to 5, characterized in that: The transmission structure includes a threaded sleeve and a screw rod cooperating with the threaded sleeve, the proximal end of the screw rod is threadedly connected to the distal end of the threaded sleeve, the proximal end of the threaded sleeve is transmission-connected to the driving member, the distal end block is fixedly connected to the distal end of the screw rod, and the threaded sleeve is rotationally connected to the proximal end block.

10. The expandable test mold according to claim 9, characterized in that: The transmission structure also includes a positioning pin, a limiting hole is provided on the proximal end block, and a limiting groove is provided at the proximal end of the threaded sleeve. The positioning pin passes through the limiting hole and is located in the limiting groove to prevent the threaded sleeve from moving axially relative to the proximal end block.

11. The expandable test mold according to claim 9, characterized in that: The distal end of the driving member has a first matching portion, and the proximal end of the threaded sleeve has a second matching portion matching with the first matching portion.

Images