Anchoring strength test tool and clamping mechanism for anchor

Abstract

The utility model discloses an anchor anchoring strength test frock, include: base, the base includes at least two cross section is the base of isosceles right triangle, clamping mechanism, the clamping mechanism can fix the test piece on one base or the splicing structure of the splicing of multiple base, the bearing surface for bearing test piece on the base or splicing structure has the included angle a with plumb surface, the included angle a can take value at least 0 or 45 or 90, pull mechanism, set up above base, the pull mechanism includes the pull part of fixed connection with the anchor tail on test piece, is used for connecting test equipment's connecting portion, the pull part is connected with connecting portion. Corresponding still provides a kind of application above-mentioned test frock's clamping mechanism. The remarkable effect of the utility model is that the force condition of anchor in bone tissue can be simulated truly, and test result is more accurate, more instructive.

Description

Technical Field

[0001] This utility model belongs to the field of medical device testing, specifically relating to an anchor bolt anchoring strength testing fixture and clamping mechanism. Background Technology

[0002] In minimally invasive orthopedic surgery, anchors are crucial implants connecting soft tissue and bone, such as in rotator cuff repair and meniscus repair. Anchors are typically inserted vertically or at a 45-degree angle. After implantation, the anchor experiences forces from different directions due to the mutual traction between the soft and bone tissues. The anchoring strength directly affects surgical efficacy and patient prognosis. Assessing anchoring strength can guide anchor structural design and determine surgical insertion angles and depths.

[0003] In existing technologies, a tensile test is generally used to create a test specimen by embedding the anchor bolt into a substrate. The mechanical properties are then tested by pulling out the anchor bolt to verify its reliability. In the process of developing this invention, it was discovered that the existing technology has at least the following problems:

[0004] 1. There are no dedicated devices or fixtures for testing anchor strength in the current technology. Most tests are conducted using tensile testing machines and self-made fixtures. However, the fixtures do not fully simulate the tension of soft tissue and bone tissue on the anchor, resulting in poor data guidance.

[0005] 2. The test piece was not made to fully simulate the actual object, resulting in poor guidance of the measured data. Utility Model Content

[0006] To address the aforementioned problems, this invention aims to provide a testing fixture and clamping mechanism that can fully simulate the traction conditions of soft tissue and bone tissue on anchors, and whose test data is more reliable.

[0007] The technical solution to the problem of this utility model is: an anchor bolt anchorage strength testing fixture, comprising:

[0008] A base, the base comprising at least two bases with cross-sections of isosceles right triangles;

[0009] A clamping mechanism that can fix the test piece to one of the bases or a splicing structure composed of multiple bases; the bearing surface of the base or splicing structure used to support the test piece has an angle α with the plumb surface, and the angle α can be at least 0°, 45° or 90°;

[0010] A traction mechanism is disposed above the base. The traction mechanism includes a traction part that can be fixedly connected to the tail of the anchor on the test piece and a connecting part for connecting the test equipment. The traction part is connected to the connecting part.

[0011] In the above scheme, a modular base structure is adopted, and one or more bases can be selected to support the test piece as needed. This allows the anchors to have different commonly used implantation angles after the test piece is clamped, thus simulating the actual situation more flexibly.

[0012] In one specific embodiment, the connecting part includes a clamping part that can be connected to the testing equipment and a support seat that is fixedly connected to the clamping part; the pulling part includes a pull rope that can be connected to the support seat.

[0013] In one feasible solution, the pulling part further includes a slider that can slide on the support seat and a locking device that restricts the sliding of the slider, and the pulling rope is connected to the slider.

[0014] In the above scheme, the sliding of the traction part can make the connection line between the traction rope and the tail of the anchor not always at the plumb line, but form different angles with the plumb line, which can simulate the actual working conditions of soft tissue and bone tissue pulling the anchor at different angles.

[0015] Furthermore, the support seat has a sliding groove, and the slider is slidably connected to the sliding groove; the locking device includes two limiting blocks disposed on the support seat and located on both sides of the slider, each limiting block can slide on the support seat, and each limiting block has a screw hole, in which a set screw that can abut against the support seat is provided.

[0016] In one feasible solution, a hollow space is provided on the cross-sectional end face of the base; the clamping mechanism includes two mirror-arranged tiger clips, one end of which extends into the hollow space and abuts against the base.

[0017] Furthermore, each side of the base is provided with connection holes for fastening the connection.

[0018] In one feasible solution, at least one side of the base is provided with a limiting mechanism to restrict the displacement of the test piece. The purpose of setting the limiting mechanism is to prevent the test piece from loosening during the pulling process because the clamping force of the clamping mechanism is not in the same straight line as the tension of the pull rope.

[0019] In one specific embodiment, the limiting mechanism includes a limiting plate and a limiting pin. One side of the limiting plate can abut against the test piece, and the limiting pin abuts against the other side of the limiting plate. The limiting pin is fixed to the side of the waist.

[0020] Accordingly, an anchor bolt anchorage strength testing clamping mechanism is also provided, comprising:

[0021] The testing equipment includes an upper gripper and a worktable, with a clamping space provided between the upper gripper and the worktable;

[0022] The test piece includes a porous material matrix for simulating bone and anchors inserted into the matrix;

[0023] And the aforementioned anchor bolt anchorage strength testing fixture, wherein the testing fixture is disposed within the clamping space;

[0024] The upper gripper clamping connection part;

[0025] The pulling part is connected to the tail of the anchor;

[0026] The clamping mechanism fixes the base to one of the bases or to a splicing structure composed of multiple bases;

[0027] The base or splicing structure is fixed to the workbench.

[0028] In actual testing, the following situations typically occur:

[0029] When an angle of 45° is required, the structure used to support the test piece is a base, with the base of the test piece placed on one side of the waist of the base;

[0030] When an angle of 0° or 90° is required, the structure used to support the test piece is a spliced ​​structure consisting of at least two bases, with the base of the test piece placed on one side of the waist of one of the bases.

[0031] The significant advantage of this invention is its ability to realistically simulate the stress state of anchors within bone tissue, accurately reflecting the various properties of the anchors and providing more precise and instructive test results. Specifically, this is manifested in the following aspects:

[0032] 1. The system adopts a modular base structure, allowing the use of one or more bases to support the test specimen as needed. This enables the anchors to have different commonly used implantation angles after the test specimen is clamped, realistically simulating the situation of anchors being implanted into bone tissue during actual surgery.

[0033] 2. The design of the sliding traction component allows the direction of the pulling force of the rope to be adjusted at multiple angles, realistically simulating the actual traction conditions of soft tissue and bone tissue on the anchor after surgery.

[0034] 3. By using porous materials as the matrix, the porous structure of real bone tissue can be simulated.

[0035] Furthermore, the tooling of this invention does not require specialized equipment and can be installed on equipment with pull-out testing functions, such as tensile testing machines and fatigue testing machines, demonstrating good versatility. Because accurate testing can be performed without additional investment in specialized equipment, the cost is low. Attached Figure Description

[0036] The present invention will be further described below with reference to the accompanying drawings.

[0037] Figure 1 This is a schematic diagram of the base structure of this utility model.

[0038] Figure 2 This is a schematic diagram of the tiger card structure of this utility model.

[0039] Figure 3 This is a schematic diagram of the traction mechanism of this utility model (the pull rope is not shown).

[0040] Figure 4 This is a diagram showing the working state of embodiment 1 of the testing fixture of this utility model.

[0041] Figure 5 This is a diagram showing the working state of embodiment 2 of the testing fixture of this utility model.

[0042] Figure 6 This is a diagram showing the working state of embodiment 3 of the testing fixture of this utility model.

[0043] In the diagram: 1-base, 2-clamping mechanism, 3-traction mechanism, 4-test piece, 5-limiting mechanism, 11-hollow space, 12-connecting hole, 13-waist side, 14-bottom side, 15-end face, 21-tiger clip, 22-bolt, 31-traction part, 32-connecting part, 311-pull rope, 312-slider, 313-limiting block, 314-set screw, 321-clamping part, 322-bearing seat, 323-slide groove, 41-anchor nail, 42-base, 51-limiting plate, 52-limiting nail. Detailed Implementation

[0044] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0045] For ease of description, the relative positional relationships of the components (e.g., top, bottom, left, right, etc.) are described according to the layout direction of the accompanying drawings in the specification, and do not limit the structure of this patent.

[0046] Figures 1-3 The present invention illustrates the anchor anchoring strength testing fixture, which includes a base, a clamping mechanism 2, and a pulling mechanism 3.

[0047] The base includes at least two bases 1 with cross-sections of isosceles right triangles. For each base 1, the sides include waist side 13 and bottom side 14. The surface formed by stretching the right-angled side (leg) of the isosceles right triangle is considered as waist side 13, the surface formed by stretching the base of the isosceles right triangle is considered as bottom surface 14, and the surface formed by the contour enclosed by the right-angled side and the base of the isosceles right triangle is considered as end surface 15.

[0048] The clamping mechanism 2 can fix the test piece to one of the bases 1 or to a splicing structure composed of multiple bases 1. "Multiple" refers to two or more. The bearing surface of the base 1 or splicing structure used to support the test piece has an angle α with the plumb bob surface. The angle α can be at least 0°, 45°, or 90°.

[0049] The traction mechanism 3 is disposed above the base. The traction mechanism 3 includes a traction part 31 that can be fixedly connected to the tail of the anchor on the test piece 4, and a connecting part 32 for connecting the test equipment. The traction part 31 is connected to the connecting part 32.

[0050] Generally, the end of the anchor 41 that is inserted deeper into the base 42 is considered the anchor head, and the end that is inserted shallower is considered the anchor tail.

[0051] The connecting part 32 includes a clamping part 321 that can be connected to the testing equipment and a support seat 322 that is fixedly connected to the clamping part 321. The pulling part 31 includes a pull rope 311 that can be connected to the support seat 322.

[0052] The pulling part 31 also includes a slider 312 that can slide on the support seat 322 and a locking device that restricts the sliding of the slider 312. The pull rope 311 is connected to the slider 312.

[0053] The support base 322 has a sliding groove 323. The slider 312 is slidably connected to the sliding groove 323. The locking device includes two limiting blocks 313 disposed on the support base 322 and located on both sides of the slider 312. Each limiting block 313 can slide on the support base 322, and each limiting block 313 has a screw hole, in which a set screw 314 is provided that can abut against the support base 322.

[0054] A hollow space 11 is provided on the cross-sectional end face 15 of the base 1. The hollow space 11 does not necessarily need to be manufactured using a hollowing process, but rather refers to a through-hole that can pass through. The clamping mechanism 2 includes two mirror-arranged clamps 21. The clamps 21 are existing technology and can be purchased commercially.

[0055] Each side of the base 1 is provided with a connection hole 12 for fastening connection.

[0056] Example 1

[0057] Figures 1-4 An embodiment of the present invention is shown, an anchor bolt anchorage strength testing clamping mechanism, including testing equipment, test piece 4, and the above-mentioned anchor bolt anchorage strength testing fixture.

[0058] The testing equipment includes an upper gripper and a worktable. The worktable is a structure used to fix the base. The worktable can be a platform or a lower gripper, as long as it can fix the base. For example, an MTS Landmark electro-hydraulic servo material testing machine can be used, which has an upper gripper and a lower gripper. Bolts are fixedly connected to the connecting holes 12 on the base 1, and the lower gripper clamps the bolts, thereby fixing the base 1. A clamping space is provided between the upper gripper and the worktable. The testing fixture is set within the clamping space.

[0059] The test piece 4 includes a hexahedral porous material matrix 42 for simulating bone and anchors 41 inserted into the matrix 42.

[0060] This embodiment simulates a 45-degree tilt test of an anchor pin inserted into a substrate, where angle α is 45°. The structure supporting the test piece 4 is a base 1, with the substrate 42 of the test piece 4 placed on a side 13 of the base 1. The base 1 is fixed to a workbench.

[0061] The upper gripper holding connection part 32.

[0062] The pulling part 31 is connected to the tail of the anchor.

[0063] Two mirror-mounted tiger clips 21 have one end extending into the hollow space 11 and abutting against the base 1. The bolts 22 of the tiger clips fix the base 42 to the waist side of the base.

[0064] The base 1 has a limiting mechanism 5 on its waist side 13 for fixing the base 42, which can limit the displacement of the test piece 4.

[0065] The limiting mechanism 5 includes a limiting plate 51 and a limiting pin 52. One side of the limiting plate 51 can abut against the test piece 4, and the limiting pin 52 abuts against the other side of the limiting plate 51. The limiting pin 52 is fixed to the waist side 13 used to fix the base 42.

[0066] The traction mechanism 3 is located above the base.

[0067] There are various specific structures for the connecting part 32. Two feasible structures are shown below:

[0068] In a first feasible embodiment, the clamping part 321 is fixedly connected to one end of the support seat 322, the clamping part 321 is perpendicular to the support seat 322 to form an L-shaped cantilever structure, the clamping part 321 is clamped by the upper jaw, and the support seat 322 is horizontally cantilevered.

[0069] In a second feasible embodiment, the clamping part 321 is fixedly connected to both ends of the support seat 322 to form a U-shaped structure, the clamping part 321 is clamped by the upper jaw, and the support seat 322 is horizontally arranged.

[0070] The accompanying drawings of this embodiment illustrate the first type.

[0071] The specific procedures during the experiment are as follows:

[0072] After clamping and fixing the test piece 4, fix the lower end of the pull rope 311 to the tail of the anchor nail. Adjust the position of the slider 312 on the support seat 322 according to the required pulling angle. After adjustment, lock the slider 312 through the limit block 313. Start the test equipment. During the upward pulling process of the upper jaw, apply a pulling force to the anchor nail 41 through the pull rope 311 to obtain test data.

[0073] Example 2

[0074] Figures 1-3 and Figure 5 The second embodiment of this utility model is shown. The clamping method and experimental operation steps are the same as those in Embodiment 1, except that this embodiment simulates a vertical anchor insertion into the substrate for traction testing. The axis of the anchor 41 is perpendicular to the bearing surface. In this embodiment, angle a is 90°. This experiment uses a spliced ​​structure composed of two bases 1 as the base. The bottom sides 14 of the two bases 1 abut each other and are fixed with fasteners. After splicing, a cubic base is formed. The base is fixed to the workbench. The waist side 13 of one of the bases 1 is parallel to the horizontal plane, and the substrate 42 is fixed to the waist side 13 by a tiger clamp 21. In this embodiment, the limiting mechanism 5 can be omitted.

[0075] Example 3

[0076] Figures 1-3 and Figure 6 The third embodiment of this utility model is shown. The testing fixture, clamping method, and experimental operation steps are the same as in embodiment 2. The difference is that this embodiment simulates a horizontal anchor bolt implantation into the substrate for traction testing. The axis of the anchor bolt 41 is parallel to the bearing surface. Angle α is also 90°.

Claims

1. A fixture for testing the anchorage strength of anchor bolts, characterized in that, include: A base, the base comprising at least two bases with cross-sections of isosceles right triangles; A clamping mechanism that can fix the test piece to one of the bases or a splicing structure composed of multiple bases; the bearing surface of the base or splicing structure used to support the test piece has an angle α with the plumb surface, and the angle α can be at least 0°, 45° or 90°; A traction mechanism is disposed above the base. The traction mechanism includes a traction part that can be fixedly connected to the tail of the anchor on the test piece and a connecting part for connecting the test equipment. The traction part is connected to the connecting part.

2. The anchor bolt anchorage strength testing fixture according to claim 1, characterized in that: The connecting part includes a clamping part that can be connected to the testing equipment and a bearing seat that is fixedly connected to the clamping part; the pulling part includes a pulling rope that can be connected to the bearing seat.

3. The anchor bolt anchorage strength testing fixture according to claim 2, characterized in that: The pulling part also includes a slider that can slide on the support seat and a locking device that restricts the sliding of the slider, and the pulling rope is connected to the slider.

4. The anchor bolt anchorage strength testing fixture according to claim 3, characterized in that: The support seat has a sliding groove, and the slider is slidably connected to the sliding groove; the locking device includes two limiting blocks disposed on the support seat and located on both sides of the slider, each limiting block can slide on the support seat, and each limiting block has a screw hole, in which a set screw is provided that can abut against the support seat.

5. The anchor bolt anchorage strength testing fixture according to claim 1, characterized in that: A hollow space is provided on the cross-sectional end face of the base; the clamping mechanism includes two mirror-arranged tiger clips, one end of which extends into the hollow space and abuts against the base.

6. The anchor bolt anchorage strength testing fixture according to claim 1, characterized in that: Each side of the base is provided with a connection hole for fastening the connection.

7. The anchor bolt anchorage strength testing fixture according to claim 1, characterized in that: At least one side of the base is provided with a limiting mechanism that can restrict the displacement of the test piece.

8. The anchor bolt anchorage strength testing fixture according to claim 7, characterized in that: The limiting mechanism includes a limiting plate and a limiting pin. One side of the limiting plate can abut against the test piece, and the limiting pin abuts against the other side of the limiting plate. The limiting pin is fixed to the side of the waist.

9. A clamping mechanism for testing the anchoring strength of an anchor bolt, characterized in that, include: The testing equipment includes an upper gripper and a worktable, with a clamping space provided between the upper gripper and the worktable; The test piece includes a porous material matrix for simulating bone and anchors inserted into the matrix; And, the anchor bolt anchorage strength testing fixture according to any one of claims 1-8, wherein the testing fixture is disposed within the clamping space; The upper gripper clamping connection part; The pulling part is connected to the tail of the anchor; The clamping mechanism fixes the base to one of the bases or to a splicing structure composed of multiple bases; The base or splicing structure is fixed to the workbench.

10. The anchor bolt anchorage strength testing clamping mechanism according to claim 9, characterized in that: When an angle of 45° is required, the structure used to support the test piece is a base, with the base of the test piece placed on one side of the waist of the base; When an angle of 0° or 90° is required, the structure used to support the test piece is a spliced ​​structure consisting of at least two bases, with the base of the test piece placed on one side of the waist of one of the bases.

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