Pull-out force testing device for intervertebral fusion devices

Abstract

The application provides a pulling force testing device for an intervertebral fusion device, and relates to the technical field of medical devices, and comprises a test model joint, a sliding sleeve, a measuring mechanism, a pull rod and a force spring; a side wall of the sliding sleeve is provided with a scale line; when the test model joint is connected with a test model located in an intervertebral space, the elastic potential energy of the force spring is overcome by pulling the pull rod, so that the pull rod moves relative to the sliding sleeve, the test model joint synchronously drives the test model to be pulled out from the intervertebral space, and the measuring mechanism can move along the scale line with the pull rod, so as to obtain the pulling force when the test model is pulled out; the pulling-out force of the test model corresponding to the model of the fusion device selected by the doctor can be measured; the doctor can digitize the selection of the intervertebral fusion device through a large amount of test data and clinical research such as follow-up, the technical problems that the specific pulling force cannot be obtained when the test model is pulled out in the prior art, the operation and learning of the doctor can only accumulate experience, the difficulty of the operation is increased, and the learning period of the doctor is long are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a pulling force testing device for intervertebral fusion devices. BACKGROUND

[0002] Spinal fusion is a method of treating spinal diseases, which permanently fixes two segments of the spine together through surgery to eliminate pain, stabilize the spinal shape and improve nerve function; the commonly used internal implant for intervertebral fusion is an intervertebral fusion device.

[0003] During the operation, the intervertebral fusion device is selected: the doctor will select a series of non-implant devices with the same size as the intervertebral fusion device according to the preoperative planning or experience, implant the intervertebral space, and often determine the size of the trial model under the assistance of X-ray, so as to select the intervertebral fusion device with the same specification as the trial model.

[0004] However, in the existing fusion device model selection process during the operation, the experienced doctor basically perceives the size of the force when pulling out the trial model by hand feeling, although X-ray selection can assist in determining, but multiple X-ray selection will increase the operation time and increase the radiation to the doctor and the patient; without specific measurement data, it is difficult for doctors without much experience to carry out spinal fusion, and it also requires a long learning period. SUMMARY

[0005] The purpose of the present application is to provide a pulling force testing device for intervertebral fusion devices to alleviate the technical problems in the prior art that the specific pulling force cannot be known when the trial model is pulled out, resulting in that the doctor's operation and learning can only accumulate experience, causing the increase of the operation difficulty and the long learning period of the doctor.

[0006] The present application provides a pulling force testing device for intervertebral fusion devices, comprising: a trial model connector, a sliding sleeve, a measuring mechanism, a pull rod and a force spring;

[0007] The sliding sleeve has a sliding channel, one end of the pull rod extends into the sliding channel, and the end of the pull rod extending into the sliding channel has an annular protrusion, the force spring is located inside the sliding channel, and the force spring is sleeved outside the pull rod, both ends of the force spring are respectively in contact with the annular protrusion and the inner wall of the sliding sleeve;

[0008] The side wall of the sliding sleeve is provided with a scale line, the measuring mechanism is in sliding connection with the pull rod, and the measuring mechanism is arranged corresponding to the scale line;

[0009] The test model joint is used for connecting with the test model located in the intervertebral space, the test model joint is connected with the sliding sleeve away from the end of the pull rod, the pull rod can overcome the force spring relative to the sliding sleeve to move to drive the test model to pull out from the intervertebral space through the test model joint, and the measuring mechanism can move along the scale line with the pull rod to obtain the pulling force when the test model is pulled out.

[0010] In the preferred embodiment of the present application, the measuring mechanism comprises a pointer and a sleeve ring;

[0011] The pointer is connected with the sleeve ring, the sliding sleeve is provided with a first sliding groove corresponding to the side wall of the scale line, the extension direction of the first sliding groove is the same as the scale extension direction of the scale line, the pointer is slidably connected with the first sliding groove, and the pointer is correspondingly arranged with the scale line;

[0012] The sleeve ring is sleeved outside the force spring, and the sleeve ring can abut against the annular protrusion.

[0013] In the preferred embodiment of the present application, the measuring mechanism further comprises a push ring and a push plate;

[0014] The push ring is connected with the push plate, the sliding sleeve is provided with a second sliding groove, the extension direction of the second sliding groove is the same as the extension direction of the first sliding groove, and the push plate is slidably connected with the second sliding groove;

[0015] The push ring is sleeved outside the force spring, and the push ring is located at the end of the sleeve ring away from the annular protrusion, and the push plate is used for driving the sleeve ring to move along the extension direction of the second sliding groove through the push ring.

[0016] In the preferred embodiment of the present application, the second sliding groove is provided with two groups, and the two groups of second sliding grooves are symmetrically arranged relative to the axis of the sliding sleeve;

[0017] The push plate is provided with two, the two push plates are symmetrically connected with the side wall of the push ring, the two push plates are slidably connected with the two second sliding grooves respectively, and the two push plates are used for limiting the sleeve ring to reciprocate along the axial direction of the sliding channel through the push ring.

[0018] In the preferred embodiment of the present application, the sliding sleeve comprises a first sleeve and a second sleeve;

[0019] The first sleeve and the second sleeve are connected, and the sliding channel is arranged along the extension of the first sleeve and the second sleeve;

[0020] The first sliding groove and the second sliding groove are both provided on the first sleeve, and an end of the second sleeve close to the first sleeve corresponds to the first sliding groove and the second sliding groove to form an end limit;

[0021] The second sleeve is provided with a gripping section, and an anti-slip layer is provided along the surface of the gripping section.

[0022] In a preferred embodiment of the present invention, the trial mold joint includes a joint body;

[0023] The joint body is connected to the sliding sleeve, and a slot is provided at one end of the joint body away from the sliding sleeve. An annular step is provided along the inner wall of the slot. The joint body is sleeved on the outside of the test mold through the slot, and the slot is fixed to the end of the test mold through the annular step.

[0024] In a preferred embodiment of the present invention, the trial mold joint further includes a positioning mechanism;

[0025] The end of the trial mold has a positioning groove, the positioning mechanism is connected to the sliding sleeve, one end of the positioning mechanism extending out of the sliding sleeve is engaged with the positioning groove, and the positioning mechanism is used to limit the axis of the trial mold to coincide with the axis of the joint body.

[0026] In a preferred embodiment of the present invention, the positioning mechanism includes a positioning pin, a bayonet pin and a tensioning spring;

[0027] The sliding sleeve has a positioning channel at one end corresponding to the joint body, and the positioning pin is inserted into the positioning channel;

[0028] A long hole is opened along the radial direction of the positioning pin, the bayonet pin is located inside the positioning channel, and the bayonet pin is connected to the sliding sleeve, and the bayonet pin is connected to the positioning pin through the long hole;

[0029] The pressing spring is located inside the positioning channel, and two ends of the pressing spring are respectively in contact with the positioning pin and the bottom wall of the positioning channel. The pressing spring has an elastic tendency to make the positioning pin extend out of the positioning channel.

[0030] In a preferred embodiment of the present invention, it further comprises a slide hammer;

[0031] One end of the pull rod extending out of the sliding channel is provided with a sliding hammer joint, and the sliding hammer is connected to the pull rod via the sliding hammer joint. The sliding hammer is used to drive the pull rod to move in a direction to overcome the force measuring spring.

[0032] In a preferred embodiment of the present invention, it further comprises a handle;

[0033] The handle is connected to one end of the pull rod extending out of the sliding channel, and a groove is provided on the handle corresponding to the position of the sliding hammer joint, and the handle abuts against the sliding hammer through the groove.

[0034] The present invention provides a pull-out force testing device for an intervertebral fusion device, comprising: a test mold joint, a sliding sleeve, a measuring mechanism, a pull rod and a force measuring spring; the sliding sleeve has a sliding channel, and the pull rod extends into the sliding channel at one end with an annular protrusion, the force measuring spring is located inside the sliding channel, and the two ends of the force measuring spring abut against the annular protrusion and the inner wall of the sliding sleeve respectively; the side wall of the sliding sleeve is provided with scale lines, the measuring mechanism is slidably connected to the pull rod, and the measuring mechanism is arranged corresponding to the scale lines; the test mold joint is connected to the end of the sliding sleeve away from the pull rod, and when the test mold joint is connected to the test mold located in the intervertebral space, the pull rod is pulled to The rod overcomes the elastic potential energy of the force measuring spring, so that the pull rod moves relative to the sliding sleeve, and the trial mold joint synchronously drives the trial mold to be pulled out from the intervertebral space, and the measuring mechanism can move along the scale line with the pull rod to obtain the pull-out force when the trial mold is pulled out. It can measure the pull-out force of the trial mold corresponding to the fusion device model selected by the doctor. The doctor can digitize the selection of the intervertebral fusion device through a large amount of test data through clinical research such as follow-up, which alleviates the technical problem in the existing technology that the specific pull-out force cannot be known when the trial mold is pulled out, resulting in the doctor's operation and learning can only accumulate experience, resulting in increased difficulty of surgery and a long learning cycle for doctors. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0036] Figure 1 A schematic diagram of the overall structure of a pull-out force testing device for an intervertebral fusion device provided by an embodiment of the present invention;

[0037] Figure 2 A schematic cross-sectional view of a pull-out force testing device for an intervertebral fusion device provided in an embodiment of the present invention;

[0038] Figure 3 A schematic diagram of a partially enlarged structure of the pointer position of a pull-out force testing device for an intervertebral fusion device provided by an embodiment of the present invention;

[0039] Figure 4 A schematic diagram of a partially enlarged structure of the scale line position of a pull-out force testing device for an intervertebral fusion device provided by an embodiment of the present invention;

[0040] Figure 5 A schematic diagram of the structure inside a sliding sleeve of a pull-out force testing device for an intervertebral fusion device provided by an embodiment of the present invention;

[0041] Figure 6 A schematic structural diagram of a pull-out force testing device for an intervertebral fusion device provided by an embodiment of the present invention and a test mold in a connected state;

[0042] Figure 7 A schematic structural diagram of a pull-out force testing device for an intervertebral fusion device provided in an embodiment of the present invention includes a sliding hammer.

[0043] Icons: 100-test mold joint; 110-joint body; 111-slot; 112-annular step; 120-positioning mechanism; 121-positioning pin; 122-slot pin; 123-tensioning spring; 200-sliding sleeve; 210-first sleeve; 211-first slide groove; 212-scale line; 213-second slide groove; 214-positioning channel; 220-second sleeve; 300-measuring mechanism; 310-pointer; 320-ring; 330-push ring; 340-push plate; 400-pull rod; 410-annular protrusion; 420-slide hammer joint; 500-force measuring spring; 600-slide hammer; 700-handle; 710-groove; 800-test mold. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] like Figure 1-Figure 7As shown, the embodiment provides a kind of pulling force test device for intervertebral fusion device, including: test mould joint 100, sliding sleeve 200, measuring mechanism 300, pull rod 400 and force spring 500;Sliding sleeve 200 has sliding channel, one end of pull rod 400 extends to the inside of sliding channel, and the end of pull rod 400 extending to sliding channel has annular protrusion 410, force spring 500 is located in the inside of sliding channel, and force spring 500 is sleeved on the outside of pull rod 400, two ends of force spring 500 respectively with annular protrusion 410 and the inner wall of sliding sleeve 200 abut;The side wall of sliding sleeve 200 is provided with scale line 212, measuring mechanism 300 is slidably connected with pull rod 400, and measuring mechanism 300 is correspondingly arranged with scale line 212;Test mould joint 100 is used to be connected with test mould 800 located in intervertebral space, test mould joint 100 is connected with the end of sliding sleeve 200 away from pull rod 400, pull rod 400 can overcome force spring 500 relative to sliding sleeve 200 and move, to pull out test mould 800 from intervertebral space by test mould joint 100, measuring mechanism 300 can move along with pull rod 400 along scale line 212, to obtain the pulling force when pulling out test mould 800.

[0046] It should be noted that the pulling force test device for intervertebral fusion device provided by the embodiment can be used as a force measuring device for assisting in selecting implant, and can be matched with the size of pulling force measured by the force measuring device according to the accumulation of data such as the size of pulling force when selecting appropriate test mould 800 by a doctor, corresponding implant and appropriate surgical procedure, to select implant prosthesis and ensure sufficient pressure stimulation between vertebral bodies to promote better fusion of spine. Specifically, before use, measuring mechanism 300 is moved to 0 position of scale line 212, at this time, measuring mechanism 300 can abut against annular protrusion 410 in a stationary state, test mould joint 100 is connected with test mould 800 located in intervertebral space, pulling force is applied to the end of pull rod 400 away from test mould joint 100, pull rod 400 can press force spring 500 to move, when force spring 500 is pressed to a distance, pull rod 400 drives sliding sleeve 200 and test mould joint 100 to move synchronously at this time through force spring 500, test mould 800 is pulled out by test mould joint 100, since measuring mechanism 300 abuts against annular protrusion 410 of pull rod 400, measuring mechanism 300 can move synchronously along scale line 212, after test mould 800 is pulled out, the pulling force of pull rod 400 is released, pull rod 400 is retracted to the initial position under the action of force spring 500, and measuring mechanism 300 stays at the highest position of scale line 212, and the specific value of pulling force of test mould 800 is obtained by scale line 212.

[0047] Optionally, the scale line 212 can display the force value, since the elastic coefficient of the force spring 500 is known, that is, the force value on the current scale line 212 is the product of the distance moved by the pull rod 400 with the elastic coefficient; or the scale line 212 can also be a length value, and the elastic coefficient of the force spring 500 can be written outside the sliding sleeve 200, so that the user can calculate the force value according to the distance moved by the force spring 500.

[0048] The pull-out force testing device for the intervertebral fusion device provided by the embodiment comprises a test model joint 100, a sliding sleeve 200, a measuring mechanism 300, a pull rod 400 and a force spring 500. The sliding sleeve 200 has a sliding channel. The pull rod 400 has an annular protrusion 410 at one end extending into the sliding channel. The force spring 500 is located inside the sliding channel, and the two ends of the force spring 500 abut against the annular protrusion 410 and the inner wall of the sliding sleeve 200, respectively. The side wall of the sliding sleeve 200 is provided with a scale line 212. The measuring mechanism 300 is in sliding connection with the pull rod 400, and the measuring mechanism 300 is arranged in correspondence with the scale line 212. The test model joint 100 is connected to the end of the sliding sleeve 200 away from the pull rod 400. When the test model joint 100 is connected to the test model 800 located in the intervertebral space, the elastic potential energy of the force spring 500 is overcome by pulling the pull rod 400, so that the pull rod 400 moves relative to the sliding sleeve 200. The test model joint 100 synchronously drives the test model 800 to be pulled out from the intervertebral space, and the measuring mechanism 300 can move along the scale line 212 with the pull rod 400, so as to obtain the pull-out force when the test model 800 is pulled out. The pull-out force of the test model 800 corresponding to the selected fusion device model of the doctor can be measured. The doctor can digitize the selection of the intervertebral fusion device through a large amount of test data and clinical research such as follow-up, thereby solving the technical problems in the prior art that the specific pull-out force cannot be obtained when the test model 800 is pulled out, the operation and learning of the doctor can only accumulate experience, and the operation difficulty is increased and the learning period of the doctor is long.

[0049] Further, in the preferred embodiment of the present application, the measuring mechanism 300 comprises a pointer 310 and a sleeve ring 320. The pointer 310 is connected with the sleeve ring 320. The side wall of the sliding sleeve 200 corresponding to the scale line 212 is provided with a first sliding groove 211. The extension direction of the first sliding groove 211 is the same as the scale extension direction of the scale line 212. The pointer 310 is in sliding connection with the first sliding groove 211, and the pointer 310 is arranged in correspondence with the scale line 212. The sleeve ring 320 is sleeved outside the force spring 500, and the sleeve ring 320 can abut against the annular protrusion 410.

[0050] In this embodiment, the collar 320 is sleeved on the outside of the force measuring spring 500 with a clearance fit, and the inner diameter of the collar 320 is smaller than the diameter of the annular protrusion 410. The pointer 310 can pass through the first sliding groove 211 and contact the inner wall of the first sliding groove 211. On the basis of the sliding fit between the pointer 310 and the inner wall of the first sliding groove 211, there is also friction damping between the collar 320 and the inner wall of the first sleeve 210. The collar 320 can ensure the stability of the pointer 310 relative to the first sliding groove 211. The fingertip of the pointer 310 corresponds to the scale line 212. That is, before use, the pointer 310 is manually moved to correspond to the 0 position of the scale line 212. At this time, the collar 320 can just abut against the annular protrusion 410. When the pull rod 400 moves, the pointer 310 can gradually move along the extension direction of the scale line 212 until the pull rod 400 and the sliding sleeve 200 are relatively stationary, and the pointer 310 now stays at the highest position.

[0051] Optionally, the pointer 310 and the collar 320 may be integrally formed.

[0052] In a preferred embodiment of the present invention, the measuring mechanism 300 also includes a push ring 330 and a push plate 340; the push ring 330 is connected to the push plate 340, and a second slide groove 213 is provided on the sliding sleeve 200, and the extension direction of the second slide groove 213 is the same as the extension direction of the first slide groove 211, and the push plate 340 is slidingly connected to the second slide groove 213; the push ring 330 is sleeved on the outside of the force measuring spring 500, and the push ring 330 is located at the end of the ring 320 away from the annular protrusion 410, and the push plate 340 is used to drive the ring 320 to move along the extension direction of the second slide groove 213 through the push ring 330.

[0053] When the finger ring 310 is in the state of being moved to the left, the push ring 330 is in the state of being moved to the right, and the push ring 330 is in the state of being moved to the left, and the push ring 330 is in the state of being moved to the right, and the push ring 330 is in the state of being moved to the left, and the push ring 330 is in the state of being moved to the right, and the push ring 330 is in the state of being moved to the right, and the push ring 330 is in the state of being moved to the right, and the push ring 330 is in the state of being moved to the right, and the push ring

[0054] In the preferable embodiment of the present application, the second sliding groove 213 is provided with two groups, and the two groups of second sliding grooves 213 are symmetrically arranged relative to the axis of the sliding sleeve 200; the push plate 340 is provided with two, and the two push plates 340 are symmetrically connected with the side wall of the push ring 330, and the two push plates 340 are respectively in sliding connection with the two second sliding grooves 213, and the two push plates 340 are used to limit the reciprocating movement of the sleeve ring 320 along the axis of the sliding channel through the push ring 330.

[0055] In the embodiment, through the symmetrically arranged two groups of second sliding grooves 213, the two push plates 340 are provided on the opposite sides of the push ring 330, and the two push plates 340 are in cooperation with the two second sliding grooves 213, and since each push plate 340 is in contact cooperation with the corresponding second sliding groove 213, the symmetrically structured push plate 340 can exert a limiting force on the push ring 330, so as to make the axis of the push ring 330 coincide with the axis of the pull rod 400, thereby being able to limit the coincidence of the axis of the sleeve ring 320 and the axis of the pull rod 400 through the push ring 330, and ensuring the stability of the pointer 310 during the movement along the scale line 212.

[0056] Alternatively, the sliding sleeve 200 is provided with a limiting groove 710 at the position corresponding to the second sliding groove 213, and the push plate 340 can adopt a T-shaped structure, that is, one end of the push plate 340 penetrates through the second sliding groove 213 and is connected with the push ring 330, and the other end of the push plate 340 is in limiting cooperation with the limiting groove 710, and the limiting groove 710 can better ensure the stability of the push plate 340, so as to be able to limit the coincidence of the axis of the push ring 330 and the axis of the pull rod 400 through the symmetrically arranged two push plates 340.

[0057] In the preferable embodiment of the present application, the sliding sleeve 200 comprises a first sleeve 210 and a second sleeve 220; the first sleeve 210 and the second sleeve 220 are connected, and the sliding channel extends along the first sleeve 210 and the second sleeve 220; the first sliding groove 211 and the second sliding groove 213 are both arranged on the first sleeve 210, and the second sleeve 220 is close to one end of the first sleeve 210, and the second sleeve 220 corresponds to the first sliding groove 211 and the second sliding groove 213 to form an end limit; the second sleeve 220 is provided with a holding section, and a non-slip layer is arranged on the surface along the holding section.

[0058] In this embodiment, the end of the first sleeve 210 corresponding to the test mold joint 100 can adopt a conical structure, and the end of the first sleeve 210 corresponding to the second sleeve 220 can be provided with a thread, the second sleeve 220 is sleeved on the threaded section of the first sleeve 210, and the second sleeve 220 and the first sleeve 210 can be fixed by a threaded connection, and the end of the second sleeve 220 corresponds to the first slide groove 211 and the second slide groove 213 to form an end abutment limit, and the pull rod 400 can extend through the first sleeve 210 and the second sleeve 220, and one end of the force measuring spring 500 is connected to the annular protrusion 4 10 abutment, the other end of the force-measuring spring 500 can abut against the inner wall of the end of the second sleeve 220 away from the first sleeve 210, that is, the maximum elastic compression of the force-measuring spring 500 is the extension length of the first sleeve 210, and the maximum distance that the pointer 310 can move along the scale line 212 is the extension length of the first sleeve 210. By utilizing the split structure of the second sleeve 220 and the first sleeve 210, the maximum compression of the force-measuring spring 500 can be limited on the basis of ensuring assembly, thereby avoiding the possibility of damage caused by the pulling force exceeding the compression index of the force-measuring spring 500.

[0059] Furthermore, since the user needs to hold and fix the sliding sleeve 200 during the pulling process of the pull rod 400, the first sleeve 210 has a first slide groove 211 and a second slide groove 213. At the same time, the pointer 310 and the push plate 340 need to move along the side wall of the sliding sleeve 200. A gripping section is formed on the outer wall of the second sleeve 220, and an anti-slip layer is provided on the gripping section. The anti-slip layer can adopt anti-slip protrusions or anti-slip corrugations, etc., so as to increase the friction during gripping and ensure stability during use.

[0060] In a preferred embodiment of the present invention, the test mold joint 100 includes a joint body 110; the joint body 110 is connected to the sliding sleeve 200, and a slot 111 is provided at one end of the joint body 110 away from the sliding sleeve 200, and an annular step 112 is provided along the inner wall of the slot 111. The joint body 110 is sleeved on the outside of the test mold 800 through the slot 111, and the slot 111 is fixed to the end of the test mold 800 through the annular step 112.

[0061] In this embodiment, the connector body 110 can adopt a claw structure, that is, the connector body 110 has a card groove 111 at the end corresponding to the test mold 800, and the card groove 111 has an opening on the side wall of the connector body 110. The opening can ensure that the end of the test mold 800 extends into the interior of the card groove 111. The card groove 111 has an annular step 112 at the end of the test mold 800. The annular step 112 is used to form a circumferential clamping fixation on the end of the test mold 800, thereby ensuring the stability of the force transmission to the test mold 800 when the test mold 800 is axially pulled.

[0062] In a preferred embodiment of the present invention, the test mold joint 100 also includes a positioning mechanism 120; the end of the test mold 800 has a positioning groove, the positioning mechanism 120 is connected to the sliding sleeve 200, and the positioning mechanism 120 extends out of one end of the sliding sleeve 200 and engages with the positioning groove. The positioning mechanism 120 is used to limit the axis of the test mold 800 to coincide with the axis of the joint body 110.

[0063] In this embodiment, since the pull rod 400 cannot ensure continuous force along the axial direction of the test mold 800 when pulling, a positioning mechanism 120 is provided at the position where the joint body 110 is connected to the sliding sleeve 200. The positioning mechanism 120 can be inserted into the positioning groove at the end of the test mold 800. The limited positioning of the positioning mechanism 120 can ensure the stability and axial correspondence of the connection between the joint body 110 and the test mold 800.

[0064] In a preferred embodiment of the present invention, the positioning mechanism 120 includes a positioning pin 121, a bayonet pin 122 and a tensioning spring 123; the sliding sleeve 200 has a positioning channel 214 at one end corresponding to the joint body 110, and the positioning pin 121 is inserted into the positioning channel 214; a long hole is opened along the radial direction of the positioning pin 121, the bayonet pin 122 is located inside the positioning channel 214, and the bayonet pin 122 is connected to the sliding sleeve 200, and the bayonet pin 122 is connected to the positioning pin 121 through the long hole; the tensioning spring 123 is located inside the positioning channel 214, and the two ends of the tensioning spring 123 are respectively in contact with the positioning pin 121 and the bottom wall of the positioning channel 214, and the tensioning spring 123 has an elastic tendency to make the positioning pin 121 extend out of the positioning channel 214.

[0065] In this embodiment, the sliding sleeve 200 and the joint body 110 can be connected by threads, and a positioning channel 214 is opened at the center position of the sliding sleeve 200 corresponding to the joint body 110. The positioning pin 121 is arranged along the positioning channel 214, and the locking pin 122 is arranged vertically to the positioning pin 121, that is, the locking slot 111 is matched with the positioning slot through the long hole, and the end of the positioning pin 121 away from the positioning slot is matched with the positioning channel 214 through the tightening spring 123. The tightening spring 123 can ensure that the positioning pin 121 is always in contact with the inside of the positioning slot, so as to ensure that the positioning pin 121, the sliding sleeve 200 and the joint body 110 form a unified positioning and matching connection with the test mold 800, thereby ensuring the stability of the connection between the joint body 110 and the test mold 800.

[0066] Optionally, the latch 122 can form a circumferential limit on the positioning pin 121 through the elongated hole, and during the movement of the test mold 800, when the test mold 800 applies a reverse force to the positioning pin 121, the positioning pin 121 can form an abutment limit relative to the elongated hole on the basis of having a movable margin of movement, thereby ensuring the stability of the limit of the positioning pin 121.

[0067] In a preferred embodiment of the present invention, a sliding hammer 600 is also included; one end of the pull rod 400 extending out of the sliding channel has a sliding hammer joint 420, and the sliding hammer 600 is connected to the pull rod 400 through the sliding hammer joint 420. The sliding hammer 600 is used to drive the pull rod 400 to move in the direction of overcoming the force measuring spring 500.

[0068] In this embodiment, the sliding hammer joint 420 and the pull rod 400 can be connected by threads or can be integrally formed. By forming the sliding hammer joint 420 at the end of the pull rod 400, the sliding hammer joint 420 is connected to the sliding hammer 600. By utilizing the pulling force of the sliding hammer 600, the axial pulling force can be better applied to the test mold 800 through the pull rod 400, the sliding sleeve 200 and the test mold joint 100.

[0069] In a preferred embodiment of the present invention, a handle 700 is further included; the handle 700 is connected to one end of the pull rod 400 extending out of the sliding channel, and a groove 710 is provided on the handle 700 corresponding to the position of the sliding hammer joint 420, and the handle 700 abuts against the sliding hammer 600 through the groove 710.

[0070] In this embodiment, the handle 700 is arranged vertically to the pull rod 400, and the handle 700 can be conveniently held and fixed by the user. The handle 700 forms a groove 710 corresponding to the position of the sliding hammer joint 420. The sliding hammer joint 420 extends out of the groove 710 and is connected to the sliding hammer 600. The sliding hammer 600 can abut against the handle 700 through the groove 710, ensuring the compactness and stability of the overall structure.

[0071] Finally, it should be noted that 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 pull-out force testing device for an intervertebral fusion device, characterized in that: include: A test mold joint (100), a sliding sleeve (200), a measuring mechanism (300), a pull rod (400) and a force measuring spring (500); The sliding sleeve (200) has a sliding channel, one end of the pull rod (400) extends into the sliding channel, and the end of the pull rod (400) extending into the sliding channel has an annular protrusion (410), the force measuring spring (500) is located inside the sliding channel, and the force measuring spring (500) is sleeved on the outside of the pull rod (400), and the two ends of the force measuring spring (500) are respectively in contact with the annular protrusion (410) and the inner wall of the sliding sleeve (200); The side wall of the sliding sleeve (200) is provided with a scale line (212), the measuring mechanism (300) is slidably connected to the pull rod (400), and the measuring mechanism (300) is arranged corresponding to the scale line (212); The test mold joint (100) is used to connect with the test mold (800) located in the intervertebral space. The test mold joint (100) is connected to one end of the sliding sleeve (200) away from the pull rod (400). The pull rod (400) can overcome the force measuring spring (500) and move relative to the sliding sleeve (200) to drive the test mold (800) to be pulled out from the intervertebral space through the test mold joint (100). The measuring mechanism (300) can move along the scale line (212) with the pull rod (400) to obtain the pulling force when the test mold (800) is pulled out.

2. The pull-out force testing device for an intervertebral fusion device according to claim 1, characterized in that: The measuring mechanism (300) includes a pointer (310) and a collar (320); The pointer (310) is connected to the collar (320), and a first sliding groove (211) is provided on the side wall of the sliding sleeve (200) corresponding to the scale line (212). The extension direction of the first sliding groove (211) is the same as the extension direction of the scale line (212). The pointer (310) is slidably connected to the first sliding groove (211), and the pointer (310) is arranged corresponding to the scale line (212); The collar (320) is sleeved on the outside of the force measuring spring (500), and the collar (320) can abut against the annular protrusion (410).

3. The pull-out force testing device for an intervertebral fusion device according to claim 2, characterized in that: The measuring mechanism (300) further includes a push ring (330) and a push plate (340); The push ring (330) is connected to the push plate (340), and a second slide groove (213) is provided on the sliding sleeve (200). The extension direction of the second slide groove (213) is the same as the extension direction of the first slide groove (211), and the push plate (340) is slidably connected to the second slide groove (213); The push ring (330) is sleeved on the outside of the force measuring spring (500), and the push ring (330) is located at the end of the collar (320) away from the annular protrusion (410), and the push plate (340) is used to drive the collar (320) to move along the extension direction of the second slide groove (213) through the push ring (330).

4. The pull-out force testing device for an intervertebral fusion device according to claim 3, characterized in that: Two groups of the second sliding grooves (213) are provided, and the two groups of the second sliding grooves (213) are symmetrically arranged relative to the axis of the sliding sleeve (200); There are two push plates (340), and the two push plates (340) are symmetrically connected to the side walls of the push ring (330). The two push plates (340) are respectively slidably connected to the two second sliding grooves (213). The two push plates (340) are used to limit the axial reciprocating movement of the ring (320) along the sliding channel through the push ring (330).

5. The pull-out force testing device for an intervertebral fusion device according to claim 4, characterized in that: The sliding sleeve (200) includes a first sleeve (210) and a second sleeve (220); The first sleeve (210) and the second sleeve (220) are connected, and the sliding channel is extended along the first sleeve (210) and the second sleeve (220); The first sliding groove (211) and the second sliding groove (213) are both provided on the first sleeve (210), and one end of the second sleeve (220) close to the first sleeve (210) corresponds to the first sliding groove (211) and the second sliding groove (213) to form an end limit; The second sleeve (220) is provided with a gripping section, and an anti-slip layer is provided along the surface of the gripping section.

6. The pull-out force testing device for an intervertebral fusion device according to claim 1, characterized in that: The trial mold joint (100) comprises a joint body (110); The connector body (110) is connected to the sliding sleeve (200); a clamping groove (111) is provided at one end of the connector body (110) away from the sliding sleeve (200); an annular step (112) is provided along the inner wall of the clamping groove (111); the connector body (110) is sleeved on the outside of the test mold (800) through the clamping groove (111); and the clamping groove (111) is clamped and fixed to the end of the test mold (800) through the annular step (112).

7. The pull-out force testing device for an intervertebral fusion device according to claim 6, characterized in that: The trial mold joint (100) further includes a positioning mechanism (120); The end of the test mold (800) has a positioning groove, the positioning mechanism (120) is connected to the sliding sleeve (200), and one end of the positioning mechanism (120) extending from the sliding sleeve (200) is engaged with the positioning groove. The positioning mechanism (120) is used to limit the axis of the test mold (800) to coincide with the axis of the joint body (110).

8. The pull-out force testing device for an intervertebral fusion device according to claim 7, characterized in that: The positioning mechanism (120) includes a positioning pin (121), a locking pin (122) and a tightening spring (123); The sliding sleeve (200) has a positioning channel (214) at one end corresponding to the joint body (110), and the positioning pin (121) is inserted into the positioning channel (214); A long hole is provided along the radial direction of the positioning pin (121), the bayonet pin (122) is located inside the positioning channel (214), and the bayonet pin (122) is connected to the sliding sleeve (200), and the bayonet pin (122) is connected to the positioning pin (121) through the long hole; The pressing spring (123) is located inside the positioning channel (214), and the two ends of the pressing spring (123) are respectively in contact with the positioning pin (121) and the bottom wall of the positioning channel (214), and the pressing spring (123) has an elastic tendency to make the positioning pin (121) extend out of the positioning channel (214).

9. The pull-out force testing device for an intervertebral fusion device according to any one of claims 1 to 8, characterized in that: Also included is a slide hammer (600); One end of the pull rod (400) extending out of the sliding channel has a sliding hammer joint (420), and the sliding hammer (600) is connected to the pull rod (400) through the sliding hammer joint (420). The sliding hammer (600) is used to drive the pull rod (400) to move in a direction to overcome the force measuring spring (500).

10. The pull-out force testing device for an intervertebral fusion device according to claim 9, characterized in that: Also included is a handle (700); The handle (700) is connected to one end of the pull rod (400) extending out of the sliding channel, and a groove (710) is provided on the handle (700) at a position corresponding to the sliding hammer joint (420), and the handle (700) abuts against the sliding hammer (600) through the groove (710).

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