Die clamping tool for bone cement performance test

Abstract

The utility model discloses a mould clamping tool for bone cement performance testing, which relates to the technical field of bone cement performance testing equipment and comprises a base plate, a containing groove is arranged on the top surface of the base plate and used for containing a mould, a wire groove is arranged at the bottom of the containing groove and used for containing a thermocouple wire, and the wire groove penetrates through the side wall of the base plate. A supporting rod is arranged on the top face of the base, a threaded rod is connected to the supporting rod in a threaded mode, the threaded rod is vertically arranged above the containing groove, a center base is arranged at the bottom of the threaded rod, a plurality of pressing heads are arranged on the center base, and the pressing heads are used for pressing the mold located in the containing groove. The mold can be prevented from deforming, operation is simplified, and the mold is prevented from toppling over.

Description

Technical Field

[0001] The utility model relates to the technical field of bone cement performance testing equipment, in particular to a mold clamping tool for bone cement performance testing. Background Art

[0002] Bone cement is a surgical implant used to fix prostheses in artificial joint replacement. The performance test items of bone cement include "testing the maximum temperature and solidification time of powder-liquid mixture".

[0003] According to the Medical Industry Standard of the People's Republic of China YY 0459-2003 Acrylic Resin Bone Cement for Surgical Implants, the principle of determining the maximum temperature and setting time of the powder-liquid mixture is to monitor the exothermic reaction occurring during the powder-liquid mixing and record the maximum temperature reached by the mixed material mass. The setting time is the time required to reach the median value of the ambient temperature and the maximum temperature.

[0004] When determining the maximum temperature and setting time of the powder-liquid mixture, the molds used include negative molds and positive molds. Fig.10 and Fig.11 The female mold 1 includes a circular base 1-1, an outer ring 1-2 is arranged on the periphery of the base 1-1, the outer ring 1-2 and the base 1-1 form a cavity for accommodating bone cement, and a thermocouple channel 1-3 is arranged on the base 1-1, the thermocouple channel 1-3 is used to accommodate a thermocouple, and the thermocouple is used to measure the temperature of the bone cement. Fig.12 and Fig.13 The male mold 2 is provided with four tapered holes 2-1 for squeezing out excess bone cement. A screw 2-2 is provided in the middle of the male mold 2 for conveniently removing the bone cement from the mold.

[0005] After the powder and liquid are mixed, the bone cement must be immediately filled into the female mold, the male mold must be covered into the female mold, and clamped with a C-clamp to ensure a constant volume. Fig.14 A three-dimensional diagram of a C-clip is provided.

[0006] During the polymerization and expansion of bone cement, a single C-clip cannot prevent the mold from warping due to the small contact area between the single C-clip and the mold. Therefore, at least three C-clip are required to clamp the mold. The use of multiple C-clip makes the operation cumbersome. In order to further prevent the mold from deforming, a reinforced polymer plate can be added to the bottom of the female mold and clamped together with the C-clip, making the operation more cumbersome. In addition, the C-clip may be placed unstably and cause the mold to fall over.

[0007] Therefore, developing a clamping tool that can prevent mold deformation, simplify operation, and prevent the mold from tipping over is a technical problem that needs to be solved at present. Utility Model Content

[0008] In view of the above-mentioned deficiencies in the prior art, the utility model provides a mold clamping tool for bone cement performance testing. The utility model can prevent the mold from being deformed, simplify the operation, and prevent the mold from tipping over.

[0009] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0010] A mold clamping tool for testing bone cement performance includes a base plate, a receiving groove is provided on the top surface of the base plate, a wire groove is provided at the bottom of the receiving groove, the wire groove passes through the side wall of the base plate, a support rod is provided on the top surface of the base plate, a screw is threadedly connected to the support rod, the screw is vertically arranged above the receiving groove, a center seat is provided at the bottom of the screw, and a plurality of pressure heads are provided on the center seat.

[0011] Furthermore, the support rod is an arched rod.

[0012] Furthermore, a handle is provided on the top of the screw.

[0013] Furthermore, there are three pressure heads, and the three pressure heads are evenly distributed along the circumference of the center seat.

[0014] Furthermore, a limiting disk is provided at the bottom of the screw, and a rotating hole and a limiting cavity are provided on the top surface of the center seat, which are connected in sequence from top to bottom. The screw is rotationally matched with the rotating hole, and the limiting disk is rotationally matched with the limiting cavity.

[0015] Furthermore, a groove is provided on the surface of the limiting plate and / or the cavity wall of the limiting cavity, and a ball is provided in the groove.

[0016] Furthermore, a plurality of telescopic guide rods are provided on the top surface of the central seat, and the tops of the telescopic guide rods are connected to the support rods.

[0017] Furthermore, the telescopic guide rod includes an outer tube and an inner rod, the inner rod and the inner cavity of the outer tube slide together in the vertical direction, the top of the outer tube is connected to the support rod, and the bottom of the inner rod is connected to the center seat.

[0018] Furthermore, a plurality of anti-rotation rods are provided on the top surface of the center seat, and anti-rotation holes are provided on the support rods, and the anti-rotation rods and the anti-rotation holes are slidably matched in the vertical direction.

[0019] The utility model has the beneficial effects:

[0020] 1. In the clamping tool of the utility model, because the mold can be placed in the receiving groove, the bottom and side of the female mold in the mold can be surrounded and restricted by the receiving groove, and the male mold in the mold can also be directly pressed by multiple pressing heads, so the mold can be prevented from warping and deformation.

[0021] 2. When using multiple pressing heads to press the mold, only one screw needs to be screwed. By screwing one screw downward, the center seat at the bottom of the screw can be driven to move downward, and the center seat drives multiple pressing heads to move downward together to press the mold. Compared with the background technology that requires operating at least three C-clamps, the operation can be simplified.

[0022] 3. The clamping tool of the utility model can be stably placed using the base plate, and the mold will not tip over, thereby improving the placement stability.

[0023] 4. By installing a handle on the top of the screw, the screw can be easily screwed.

[0024] 5. When the base plate is made of polymer material, it can further prevent the mold from deformation and also has a good thermal insulation effect.

[0025] 6. In the clamping tool of the utility model, by arranging a telescopic guide rod or a stop rod on the center seat, the center seat can be prevented from rotating during the screw rotation, so that the pressure head cannot rotate. The pressure head can only move in the vertical direction to press the male mold or leave the male mold, thereby avoiding the pressure head driving the male mold to rotate, thereby improving the overall stability of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional tool for holding a mold for testing bone cement performance. Figure 1 ;

[0027] Figure 2 It is a three-dimensional tool for holding a mold for testing bone cement performance. Figure 2 ;

[0028] Figure 3 It is a top view of a mold clamping tool for testing the properties of bone cement;

[0029] Figure 4 yes Figure 3 Sectional view at AA in the middle;

[0030] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle;

[0031] Figure 6 yes Figure 5 Schematic diagram of the structure after adding grooves and balls;

[0032] Figure 7 It is a stereoscopic diagram of a mold clamping tool for bone cement performance testing after a telescopic guide rod is added;

[0033] Figure 8 yes Figure 7 A partial enlarged view of point C in the middle;

[0034] Fig. 9 It is a stereoscopic diagram of a mold clamping tool for bone cement performance testing after a rotation stop rod is added;

[0035] Fig.10 It is a top view of the negative mold;

[0036] Fig.11 yes Fig.10 Sectional view at DD in the middle;

[0037] Fig.12 It is a top view of the positive mold;

[0038] Fig.13 yes Fig.12 Sectional view at EE;

[0039] Fig.14 It is a three-dimensional diagram of a C-clamp.

[0040] Description of reference numerals:

[0041] 1- female mold, 1-1- base, 1-2- outer ring, 1-3- thermocouple channel,

[0042] 2-male mold, 2-1-conical hole, 2-2-screw,

[0043] 3-base plate, 3-1-accommodation slot, 3-2-wire slot,

[0044] 4-support rod, 4-1-screw hole, 4-2-stop hole,

[0045] 5- Screw,

[0046] 6-center seat, 6-1-rotation hole, 6-2-limiting cavity,

[0047] 7- Pressure head,

[0048] 8-Handle,

[0049] 9-Limiting plate,

[0050] 10-telescopic guide rod, 10-1-outer tube, 10-2-inner rod,

[0051] 11- Anti-rotation rod,

[0052] 12-grooves,

[0053] 13-Ball. DETAILED DESCRIPTION

[0054] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings. It is worth noting that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which 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.

[0055] Example:

[0056] See also Figure 1-Figure 4 A mold clamping tool for testing bone cement performance includes a base plate 3, and a receiving groove 3-1 is provided on the top surface of the base plate 3. The receiving groove 3-1 is used to receive the mold, and the mold includes a female mold 1 and a male mold 2. The structures of the female mold 1 and the male mold 2 have been introduced in the background technology and will not be repeated here. A wire groove 3-2 is provided at the bottom of the receiving groove 3-1, and the wire groove 3-2 is used to receive the thermocouple wire. The wire groove 3-2 passes through the side wall of the base plate 3 to facilitate the lead-out of the thermocouple wire.

[0057] See also Figure 1-Figure 4 The top surface of the substrate 3 is fixedly mounted with a support rod 4. The support rod 4 can be welded and fixed to the top surface of the substrate 3, or the support rod 4 and the substrate 3 are an integral structure. In this embodiment, the support rod 4 is an arched rod.

[0058] See also Figure 1-Figure 2 The support rod 4 is provided with a screw hole 4-1, and the screw hole 4-1 is internally threaded with a screw rod 5, which is vertically arranged above the accommodating groove 3-1.

[0059] See also Figure 1-Figure 2 The bottom of the screw rod 5 is provided with a center seat 6, on which a plurality of pressing heads 7 are fixedly mounted, and the pressing heads 7 are used to press the mold located in the receiving groove 3-1. In this embodiment, three pressing heads 7 are provided, and the three pressing heads 7 are evenly distributed along the circumference of the center seat 6. Moreover, the pressing heads 7 are rod-shaped structures.

[0060] The use process of the clamping tool of this embodiment is as follows: (1) Place the thermocouple into the thermocouple channel 1-3 of the female mold 1, place the female mold 1 into the receiving groove 3-1, and lead the thermocouple wire out of the wire groove 3-2; (2) After the powder and liquid of the bone cement are mixed, wait until the bone cement becomes toothpaste-like, fill the bone cement into the female mold 1, and cover the male mold 2 into the female mold 1; (3) Screw the screw 5 downward, the screw 5 drives the center seat 6 to move downward, the center seat 6 drives the pressure head 7 to move downward, the pressure head 7 presses the male mold 2, so that the female mold 1 and the male mold 2 are fixed, and the space between the multiple pressure heads 7 can avoid the screw 2-2 located in the middle of the male mold 2.

[0061] In the clamping tooling of this embodiment, since the mold can be placed in the accommodating groove 3-1, the bottom and sides of the female mold 1 in the mold can be surrounded and restricted by the accommodating groove 3-1, and the male mold 2 in the mold can also be directly pressed by multiple pressing heads 7, so the mold can be prevented from warping and deformation.

[0062] When using multiple pressing heads 7 to press the mold, only one screw 5 needs to be screwed. By screwing one screw 5 downward, the center seat 6 at the bottom of the screw 5 can be driven to move downward. The center seat 6 drives multiple pressing heads 7 to move downward together to press the mold. Compared with the background technology that requires operating at least three C-clamps, the operation can be simplified.

[0063] The clamping tool of this embodiment can be stably placed using the base plate 3 without the mold tipping over, thereby improving the placement stability.

[0064] Furthermore, in order to facilitate the screwing of the screw rod 5 , a handle 8 is fixedly mounted on the top of the screw rod 5 .

[0065] Furthermore, in the clamping tool of the present embodiment, the bottom plate may be made of polymer material. The polymer material has high strength, which can further prevent the mold from being deformed, and also has a good heat preservation effect.

[0066] For further information, see Figure 5 A limit plate 9 is fixedly installed at the bottom of the screw rod 5, and the top surface of the center seat 6 is provided with a rotating hole 6-1 and a limit cavity 6-2 which are connected in sequence from top to bottom. The screw rod 5 rotates with the rotating hole 6-1, and the limit plate 9 rotates with the limit cavity 6-2.

[0067] When the screw 5 is screwed, the gap between the screw 5 and the rotating hole 6-1, and the gap between the limit plate 9 and the limit cavity 6-2 can be utilized to reduce the probability of the center seat 6 rotating with the screw 5, reduce the probability of horizontal friction between the pressure head 7 and the male mold 2, reduce the probability of the pressure head 7 driving the male mold 2 to rotate horizontally, and reduce the probability of the male mold 2 rubbing against the bone cement during horizontal rotation, thereby improving the overall stability of the mold and protecting the bone cement sample.

[0068] In order to further reduce the friction resistance between the surface of the limiting plate 9 and the wall of the limiting cavity 6-2, so as to further reduce the probability of the center seat 6 rotating with the screw 5, the following three improvements can be adopted:

[0069] (1) Only a plurality of grooves 12 are provided on the surface of the limiting plate 9, and balls 13 are provided in the grooves 12. When the screw 5 is screwed, the screw 5 drives the limiting plate 9 to rotate, and the grooves 12 on the surface of the limiting plate 9 drive the balls 13 to rotate, and the balls 13 roll with the cavity wall of the limiting cavity 6-2. At this time, the contact area between the limiting plate 9 and the limiting cavity 6-2 is reduced, and the friction force of rolling friction is smaller than that of sliding friction, which is conducive to reducing friction resistance.

[0070] (2) Only the cavity wall of the limiting cavity 6-2 is provided with a plurality of grooves 12, and balls 13 are provided in the grooves 12. When the screw 5 is screwed, the screw 5 drives the limiting plate 9 to rotate, and the surface of the limiting plate 9 and the balls 13 roll in cooperation, which is also conducive to reducing friction resistance.

[0071] (3) See Figure 6 The lower surface of the limiting plate 9 and the bottom wall of the limiting cavity 6-2 are both provided with a plurality of grooves 12, which are annular grooves, the axis of which coincides with the axis of the screw 5, and a plurality of balls 13 can be arranged in each groove 12, and the balls 13 can be steel balls. At this time, the distance between the upper surface of the limiting plate 9 and the top wall of the limiting cavity 6-2 needs to satisfy the requirement that the balls 13 will not be separated from the grooves 12 when the limiting plate 9 moves upward relative to the center seat 6. When the screw 5 is screwed, the screw 5 drives the limiting plate 9 to rotate, and the limiting plate 9 and the limiting cavity 6-2 both roll with the balls 13, which is also conducive to reducing friction resistance.

[0072] In order to further prevent the center seat 6 from rotating, two methods are provided below.

[0073] The first method of preventing the center seat 6 from rotating is shown in Figure 7 and Figure 8 , a plurality of telescopic guide rods 10 are provided on the top surface of the center seat 6. In this embodiment, the telescopic guide rod 10 includes an outer tube 10-1 and an inner rod 10-2, the inner rod 10-2 and the inner cavity of the outer tube 10-1 slide in a vertical direction, the top of the outer tube 10-1 is fixedly connected to the support rod 4, and the bottom of the inner rod 10-2 is fixedly connected to the center seat 6.

[0074] During the process of screwing the screw rod 5, the height of the screw rod 5 changes, the height of the center seat 6 at the bottom of the screw rod 5 changes, the height of the inner rod 10-2 located on the center seat 6 changes, and the inner rod 10-2 slides in the inner cavity of the outer tube 10-1 along the vertical direction. Because the outer tube 10-1 is fixedly connected to the support rod 4, the outer tube 10-1 can prevent the inner rod 10-2 and the center seat 6 from rotating in the circumferential direction, so that the center seat 6 can only change its height in the vertical direction.

[0075] The second method of preventing the center seat 6 from rotating is shown in Fig. 9 A plurality of anti-rotation rods 11 are fixedly mounted on the top surface of the center seat 6, and an anti-rotation hole 4-2 is provided on the support rod 4. The anti-rotation rods 11 and the anti-rotation hole 4-2 slide in cooperation with each other in the vertical direction.

[0076] During the process of screwing the screw rod 5, the height of the screw rod 5 changes, the height of the center seat 6 at the bottom of the screw rod 5 changes, and the height of the anti-rotation rod 11 located on the center seat 6 also changes. Because the anti-rotation rod 11 vertically slides with the anti-rotation hole 4-2 on the support rod 4, the anti-rotation hole 4-2 can prevent the anti-rotation rod 11 and the center seat 6 from rotating in the circumferential direction, so that the center seat 6 can only change its height in the vertical direction.

[0077] The above two methods can prevent the center seat 6 from rotating, so that the pressure head 7 cannot rotate. The pressure head 7 can only move up and down to press the male mold 2 or leave the male mold 2, avoiding the pressure head 7 driving the male mold 2 to rotate, thereby improving the overall stability of the mold.

[0078] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A mold clamping tool for bone cement performance testing, characterized in that: It includes a base plate, the top surface of the base plate is provided with a receiving groove, the bottom of the receiving groove is provided with a wire groove, the wire groove passes through the side wall of the base plate, the top surface of the base is provided with a support rod, the support rod is threadedly connected with a screw rod, the screw rod is vertically arranged above the receiving groove, the bottom of the screw rod is provided with a center seat, and the center seat is provided with multiple pressure heads.

2. A mold clamping tool for bone cement performance testing according to claim 1, characterized in that: The support rod is an arched rod.

3. The mold clamping tool for bone cement performance testing according to claim 1, characterized in that: A handle is provided on the top of the screw rod.

4. The mold clamping tool for bone cement performance testing according to claim 1, characterized in that: There are three pressure heads, and the three pressure heads are evenly distributed along the circumference of the center seat.

5. The mold clamping tool for bone cement performance testing according to claim 1, characterized in that: A limiting plate is provided at the bottom of the screw rod, and a rotating hole and a limiting cavity are provided on the top surface of the center seat, which are connected in sequence from top to bottom. The screw rod is rotationally matched with the rotating hole, and the limiting plate is rotationally matched with the limiting cavity.

6. A mold clamping tool for bone cement performance testing according to claim 5, characterized in that: A groove is provided on the surface of the limiting plate and / or the cavity wall of the limiting cavity, and a ball is provided in the groove.

7. A mold clamping tool for bone cement performance testing according to claim 5 or 6, characterized in that: A plurality of telescopic guide rods are arranged on the top surface of the central seat, and the tops of the telescopic guide rods are connected to the support rods.

8. A mold clamping tool for bone cement performance testing according to claim 7, characterized in that: The telescopic guide rod comprises an outer tube and an inner rod. The inner rod and the inner cavity of the outer tube are slidably matched in the vertical direction. The top of the outer tube is connected to the support rod, and the bottom of the inner rod is connected to the center seat.

9. A mold clamping tool for bone cement performance testing according to claim 5 or 6, characterized in that: The top surface of the center seat is provided with a plurality of anti-rotation rods, and the support rods are provided with anti-rotation holes, and the anti-rotation rods and the anti-rotation holes are slidably matched in the vertical direction.

Images