CN209858115U - Clamp for bone torque test - Google Patents

Abstract

The utility model discloses a fixture for bone torque test, which comprises jaws; the bottom end of the jaws is hinged with the edge of the base, and the chuck is provided with three through grooves sleeved on the jaws, the through grooves are adjacent to each other. The inner wall of the edge of the chuck is an outwardly upwardly inclined slope. Advantages: The two fixtures are horizontally fixed on both ends of the torsion testing machine through the connecting seat. After fixing, the centerlines of the two fixtures are coaxial and the jaws are opposite to each other; the chuck of the fixture moves to the bottom of the jaws At the end, the three jaws can be opened outwards to abut against the slope of the corresponding through groove. At this time, the end of the bone specimen can be placed in the middle of the three jaws, and then the chuck The top moves, and under the action of the inclined plane, the three jaws are closed to clamp the bone specimen at the same time, and then the screw is rotated to tighten the chuck; thus, the irregular bone can be stably clamped and twisted through the clamp The bone is not easy to slip during the test, which improves the accuracy of the test.

Description

Fixtures for Bone Torque Testing

Technical field:

The utility model relates to the technical field of medical instruments, in particular to a fixture for bone torque testing.

Background technique:

The torque test of the bone is one of the parameters tested in the biomechanical experiment; at present, the torque of the bone specimen is mainly tested by the torsion testing machine, so as to obtain the mechanical parameters of the torque of the bone, and provide a basis for the establishment of related theories or practical applications; At present, the clamps used for torque testing in biomechanical experiments are usually aimed at some regular samples, but for some irregular bones, the existing clamps cannot clamp them, or the clamping force is insufficient, and it is easy to cause bone damage when performing torsion tests. Sliding occurs relative to the fixture, which seriously affects the test results and reduces the accuracy of the experimental parameters.

Utility model content:

The purpose of the utility model is to provide a fixture for bone torque test which firmly clamps the bone test piece to ensure the accuracy of the parameters tested in the experiment.

The utility model is implemented by the following technical solutions: a fixture for bone torque testing, which includes a connecting seat, a base, and jaws; the top surface of the connecting seat is fixed with the horizontally arranged base through a connecting rod, and the base At least three of the jaws are arranged vertically along the edge, the bottom end of the jaws is hinged with the edge of the base, the jaws are vertically rotated, and the top surface of the base There are at least three screw rods arranged vertically and evenly distributed along the circumferential direction, and the bottom ends of the screw rods are movable below the base; a chuck that moves up and down along the jaws is horizontally provided above the base. The chuck is provided with three through grooves sleeved on the corresponding jaws, the bottom surface of the chuck is in movable contact with the top of the screw rod, and the inner wall of the through groove adjacent to the edge of the chuck is formed by the The slope from the bottom surface of the chuck to the top surface of the chuck faces outwards and upwards.

Further, the base includes a fixed base and a movable base placed on the top surface of the fixed base; the fixed base is fixedly connected to the connecting seat through the connecting rod, and the edge of the base is provided with the The bottom end of the jaws corresponds to a notch, and the top surface of the fixed base is provided with an annular groove passing through each of the notches, and the annular groove is provided with an arc-shaped hinge that passes through the bottom end of each jaw. The movable base is fixedly connected to the fixed base through bolts, and the hinged shaft is sandwiched between the fixed base and the movable base.

Further, anti-slip stripes are vertically provided on the top inner wall of the jaw.

The utility model has the advantages that when performing a torque test on a bone test piece, the two clamps are fixed horizontally on both ends of the torsion testing machine through the connecting seat respectively. After fixing, the centerlines of the two clamps are coaxial and the jaws Relatively set; when the chuck of the fixture moves to the bottom end of the jaws, the three jaws can open outwards to abut against the slopes of the corresponding through grooves, and at this time, the ends of the bones can be placed on the three jaws correspondingly. The middle of the jaws, and then move the chuck to the top of the jaws. Under the action of the inclined plane, the three jaws close and clamp the bone at the same time, and then turn the screw to tighten the chuck; thus, the clamp can realize the Irregular bones are firmly clamped, and the bones are not easy to slip during the torsion test, which improves the accuracy of the test.

Description of drawings:

Fig. 1 is the structural representation of the utility model.

FIG. 2 is a top view of FIG. 1 .

Fig. 3 is a sectional view along line A-A of Fig. 1 .

Fig. 4 is a structural schematic diagram of the fixed base.

Fig. 5 is a reference diagram of the usage state of the utility model.

The marks of the parts in the drawings are as follows: connecting seat 1, base 2, jaw 3, connecting rod 4, screw rod 5, chuck 6, through groove 7, slope 8, fixed base 9, movable base 10, notch 11, ring Groove 12, hinge shaft 13, anti-slip stripes 14, bone test piece 15, torsion testing machine 16.

Detailed ways:

As shown in Figures 1 to 5, the fixture used for bone torque testing includes a connecting seat 1, a base 2, and jaws 3; the top surface of the connecting seat 1 is fixed with a horizontally arranged base 2 through a connecting rod 4, and the base At least three jaws 3 are arranged vertically along the edge above the 2, the bottom of the jaws 3 is hinged to the edge of the base 2, the jaws 3 are vertically rotated, and the top surface of the base 2 is vertically pierced There are at least three screw rods 5 evenly distributed along the circumference of the screw connection, and the bottom ends of the screw rods 5 are movable below the base 2; a chuck 6 that moves up and down along the jaw 3 is arranged horizontally above the base 2, and three chucks 6 are arranged on the chuck 6. The through groove 7 is sleeved on the corresponding jaw 3. The bottom surface of the chuck 6 is in movable contact with the top of the screw rod 5. The inner wall of the through groove 7 adjacent to the edge of the chuck 6 is from the bottom surface of the chuck 6 to the top surface of the chuck 6 facing outward. Inclined surface 8 inclined upwards; when the irregular bone specimen 15 is subjected to a torque test, the two clamps are respectively horizontally fixed on the two ends of the torsion testing machine 16 through the connecting seat 1, and the model of the torsion testing machine 16 used is For ETT202, after the bone specimen 15 is fixed, the centerlines of the two fixtures are coaxial and the jaws 3 are oppositely arranged; when the chuck 6 of the fixture moves to the bottom of the jaws 3, the three jaws 3 can move toward the Expand outward until it abuts against the inclined surface 8 corresponding to the through groove 7. At this time, the end of the bone can be placed in the middle of the three jaws 3, and then the chuck 6 is moved to the top of the jaws 3, on the inclined surface 8. Under the action of the clamp, the three jaws 3 are closed to clamp the bone at the same time, and then the screw rod 5 is rotated to tighten the chuck 6; thus, the clamp can realize stable clamping of the irregular bone, and the bone will not be twisted during the torsion test. Easy to slip, improve the accuracy of the test.

The base 2 includes a fixed base 9 and a movable base 10 placed on the top surface of the fixed base 9; the fixed base 9 is fixedly connected to the connecting seat 1 through the connecting rod 4, and the edge of the base 2 is provided with a gap corresponding to the bottom end of the jaw 3 11. The top surface of the fixed base 9 is provided with an annular groove 12 passing through each notch 11, and the annular groove 12 is provided with an arc-shaped hinge shaft 13 pierced at the bottom of each jaw 3, and the movable base 10 is fixed by bolts. The base 9 is fixedly connected, and the hinge shaft 13 is sandwiched between the fixed base 9 and the movable base 10; The jaws 3 are fixed on the base 2, thereby realizing the detachability of the jaws 3, which facilitates the carrying and storage of the clamp; the top inner wall of the jaws 3 is vertically provided with anti-slip stripes 14, which is more conducive to increasing the number of jaws 3 The frictional force with the bone test piece 15 makes the jaw 3 clamp the bone test piece 15 more firmly.

Instructions for use: When performing a torque test on the bone specimen 15, first fix the two fixtures horizontally on both ends of the torque tester through the connecting seat 1 respectively. After fixing, the centerlines of the two fixtures are coaxial and the jaws 3 are arranged oppositely, the initial state is that the chuck 6 of the fixture is located at the bottom end of the jaws 3, and the three jaws 3 can be opened outwards to abut against the slope 8 of the corresponding through groove 7; then the bone test piece 15 The two ends are correspondingly placed in the middle of the three jaws 3 of the two fixtures, and then the chuck 6 is moved to the top of the jaws 3. Under the action of the inclined surface 8, the three jaws 3 are closed to clamp the bone at the same time, and then Rotate the screw 5 in the forward direction to tighten the chuck 6, so that the bone specimen 15 can be firmly clamped by the fixture; To the bottom of the jaws 3, the bone test piece 15 is taken out.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the Within the protection scope of the present utility model.

Claims (3)

1. The clamp for bone torque test is characterized in that it includes a connecting seat, a base, and jaws; the top surface of the connecting seat is fixed with the horizontally arranged base by a connecting rod, and the upper edge of the base is The edge is vertically provided with at least three said jaws evenly distributed, the bottom end of said jaws is hinged with the edge of said base, said jaws are vertically rotated, and the top surface of said base vertically passes through There are at least three screw rods evenly distributed along the circumferential direction, and the bottom ends of the screw rods are movable below the base; above the base, there is a chuck that moves up and down along the jaws, and the chuck There are three through grooves sleeved on the corresponding jaws, the bottom surface of the chuck is in movable contact with the top of the screw, and the inner wall of the through groove adjacent to the edge of the chuck is formed by the chuck. The slope from the bottom surface to the top surface of the chuck faces outwards and upwards. 2. The jig for bone torque test according to claim 1, wherein the base comprises a fixed base and a movable base placed on the top surface of the fixed base; the fixed base passes through the connecting rod It is fixedly connected with the connection seat, the edge of the base is provided with a gap corresponding to the bottom end of the jaw, the top surface of the fixed base is provided with an annular groove passing through each of the gaps, and the annular groove There is an arc-shaped hinge shaft pierced at the bottom end of each jaw, the movable base is fixedly connected to the fixed base through bolts, and the hinge shaft is sandwiched between the fixed base and the fixed base. between the active bases. 3. The jig for bone torque test according to any one of claims 1 or 2, characterized in that, anti-slip stripes are vertically provided on the top inner wall of the jaw.