Clamping device for electrolyte plasma polishing of titanium alloy acetabular prosthesis

Abstract

The utility model relates to the technical field of titanium alloy acetabular prosthesis polishing, in particular to a clamping device for titanium alloy acetabular prosthesis electrolyte plasma polishing, which comprises a polishing pool, a titanium alloy acetabular prosthesis main body and a heating tube, and a titanium alloy acetabular prosthesis clamping driving structure is arranged on the inner side of the polishing pool. A titanium alloy prosthesis small-area clamping structure is arranged on the inner side of the titanium alloy acetabular prosthesis main body. According to the clamping device for electrolyte plasma polishing of the titanium alloy acetabular prosthesis, the two sides of the inner wall of the titanium alloy acetabular prosthesis body can be clamped by providing expanding force to the outer side through the arc-shaped blocks, and the clamping plates can drive the conveniently-fixed titanium alloy acetabular prosthesis body to vertically and stably ascend and descend in a polishing pool containing polishing liquid; the clamping plate can fix the titanium alloy acetabular prosthesis, the situation that the titanium alloy prosthesis falls off and collides due to a conventional metal clamp is reduced, and the fixing effect of the clamping device for electrolyte plasma polishing of the titanium alloy acetabular prosthesis is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of polishing of titanium alloy acetabular prostheses, in particular to a clamping device for electrolyte plasma polishing of titanium alloy acetabular prostheses. Background Art

[0002] Titanium alloys have excellent biocompatibility, low density, high strength, resistance to physiological corrosion, and a low elastic modulus, making them widely used in the biomedical field. TC4 titanium alloy is currently the most commonly used metal material for medical implants in orthopedics and dentistry, and is often used to manufacture artificial prostheses such as dental bridges, hip and femoral stems, knee joints, and fracture plates.

[0003] For example, the publication number "CN113564683A" is named as an electrolyte plasma polishing method for titanium alloy femoral stem prosthesis. Compared with pickling, it does not need to use traditional nitric acid, hydrofluoric acid and other highly corrosive and oxidizing toxic acid solutions. Instead, it uses low-concentration inorganic salt solution as polishing liquid, which is more friendly to the ecological environment and provides better protection for the workers' operating environment and physical health. However, in the existing electrolyte plasma polishing method for titanium alloy femoral stem prosthesis, it is necessary to use metal clamps to manually immerse the fixed titanium alloy prosthesis into the polishing liquid of electrified warm water. Conventional metal clamps require the operator's wrist force to clamp it. However, the surface curvature of the titanium alloy acetabulum prosthesis is large and the texture is smooth without a good fulcrum. Therefore, the clamped titanium alloy acetabulum prosthesis is not clamped firmly enough and is prone to falling and bumping, etc., which ultimately causes the titanium alloy acetabulum prosthesis to be damaged and cannot be used normally.

[0004] At the same time, the existing electrolyte plasma polishing method for titanium alloy femoral stem prosthesis requires the use of polishing liquid to immerse the fixed titanium alloy prosthesis in it for polishing when polishing the titanium alloy prosthesis. That is to say, the part occupied by the clamping device will not be completely exposed to the polishing liquid. Therefore, each time the titanium alloy prosthesis is polished, there will always be some parts that are not polished in place. Finally, when the titanium alloy prosthesis is installed and used, the patient will feel a foreign body sensation and a wear sensation, which ultimately reduces the use effect of the titanium alloy prosthesis. Utility Model Content

[0005] The purpose of the utility model is to solve the problems of the titanium alloy acetabular prosthesis being damaged and unable to be used normally and the use effect of the titanium alloy prosthesis being reduced in the electrolyte plasma polishing method of the titanium alloy femoral stem prosthesis, and to propose a clamping device for the electrolyte plasma polishing of the titanium alloy acetabular prosthesis.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A clamping device for electrolyte plasma polishing of titanium alloy acetabular prosthesis is designed, which includes a polishing pool, a titanium alloy acetabular prosthesis body and a heating tube. Multiple heating tubes are fixedly installed on the inner wall of the polishing pool. The inner side of the polishing pool is provided with a titanium alloy acetabular prosthesis clamping and driving structure. The inner side of the titanium alloy acetabular prosthesis body is provided with a titanium alloy prosthesis small-area clamping structure. The bottom end of the inner wall of the polishing pool is provided with a titanium alloy prosthesis clamping and positioning placement structure.

[0008] Preferably, the titanium alloy acetabulum prosthesis clamping and driving structure includes a clamping plate and a movable groove, the clamping plate is movably installed on the inner side of the polishing pool, the top of the clamping plate is fixedly provided with a movable groove, the inner sides of the movable groove are rotatably connected with two threaded columns through bearings, the outer sides of the two threaded columns are threadedly connected to two movable blocks, and the two ends of the two threaded columns are fixedly connected to a twisting shaft.

[0009] Preferably, the two threaded columns are arranged in mirror image with respect to each other, the side walls of the two movable blocks are slidingly connected to the inner side of the movable groove, the bottom end of the titanium alloy acetabulum prosthesis body is movably connected to the top end of the clamping plate, and the lower end of the clamping plate is movably connected to the bottom end of the inner wall of the polishing pool.

[0010] Preferably, the titanium alloy prosthesis small-area clamping structure includes a vertical rod and an arc block, the two arc blocks are movably connected to both sides of the inner wall of the titanium alloy acetabulum prosthesis body, the lower ends of the two arc blocks are fixedly installed with connecting blocks, and the two vertical rods are fixedly installed at the lower ends of the two connecting blocks.

[0011] Preferably, the bottom ends of the two upright poles are fixedly connected to the top end of the movable block, and the two arc-shaped blocks are arranged relatively parallel to each other.

[0012] Preferably, the titanium alloy prosthesis clamping, positioning and placement structure includes a transverse plate and a limiting protrusion, and multiple limiting protrusions are fixedly installed on the inner wall of the bottom end of the polishing pool, and multiple outer sides of the limiting protrusions are movably connected with multiple through holes, and multiple through holes are fixedly opened at the bottom end of the clamping plate, and two transverse plates are fixedly installed on both sides of the outer wall of the clamping plate, and the other ends of the two transverse plates are fixedly connected with two vertical plates, and the top ends of the two vertical plates are fixedly installed with holding rods.

[0013] The utility model proposes a clamping device for electrolyte plasma polishing of a titanium alloy acetabular prosthesis, which has the beneficial effects of: by twisting the shaft, the two threaded columns are driven to rotate inside the clamping plate, and the arc-shaped block provides a spreading force to the outside to clamp the two sides of the inner wall of the titanium alloy acetabular prosthesis body; the clamping plate can drive the conveniently fixed titanium alloy acetabular prosthesis body to rise and fall vertically and smoothly in a polishing pool filled with polishing liquid; the clamping plate can fix the titanium alloy acetabular prosthesis, reduce the occurrence of titanium alloy prosthesis falling off and bumping due to relying on conventional metal clips, and improve the fixing effect of the clamping device for electrolyte plasma polishing of the titanium alloy acetabular prosthesis.

[0014] The arc block is made of a stainless steel metal block with a certain curvature near the outside. The arc surface of the outer wall of the arc block fits with the arc surface of the inner wall of the titanium alloy acetabular prosthesis. Because the arc block can match the curvature of the inner wall of the titanium alloy acetabular prosthesis, only a small contact area is required to achieve the clamping effect. In this way, the arc block can block and occupy a small part of the inner wall of the titanium alloy acetabular prosthesis body, and the area of the position that is not polished is small, and the subsequent impact is also relatively low, which improves the use effect of the clamping device for electrolyte plasma polishing of titanium alloy acetabular prosthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0016] Figure 2 for Figure 1 A front cross-sectional schematic diagram of ;

[0017] Figure 3 for Figure 1 Schematic diagram of the top surface;

[0018] Figure 4 for Figure 2 Enlarged cross-sectional view of part A in the middle;

[0019] Figure 5 for Figure 2 Enlarged cross-sectional view of part B in the middle;

[0020] Figure 6 for Figure 3 Enlarged cross-sectional view of part C in the middle.

[0021] In the figure: 1. Polishing pool, 2. Titanium alloy acetabular prosthesis main body, 3. Heating tube, 4. Titanium alloy acetabular prosthesis clamping and driving structure, 41. Clamping plate, 42. Twisting shaft, 43. Movable groove, 44. Threaded column, 45. Moving block, 5. Titanium alloy prosthesis small area clamping structure, 51. Vertical rod, 52. Connecting block, 53. Arc block, 6. Titanium alloy prosthesis clamping, positioning and placement structure, 61. Horizontal plate, 62. Vertical plate, 63. Holding rod, 64. Through hole, 65. Limiting protrusion. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings:

[0023] Example 1:

[0024] See also Figure 1-6 In this embodiment, a clamping device for electrolyte plasma polishing of a titanium alloy acetabular prosthesis is provided, comprising a polishing pool 1, a titanium alloy acetabular prosthesis body 2, and a heating tube 3. A plurality of heating tubes 3 are fixedly mounted on the inner wall of the polishing pool 1. The heating tube 3 uses an electric heating wire to heat the polishing liquid contained in the polishing pool 1. The polishing liquid is filled to a certain depth in the polishing pool 1. The polishing liquid is prepared by the method described in the comparative document. The amount of each solute is calculated using the total volume of the polishing liquid. The solutes include ammonium fluoride and potassium fluoride. Prepare a polishing solution with a total volume of 1L, and the amount of each solute is: ammonium fluoride: 5g, potassium fluoride: 30g. According to the calculation results, weigh ammonium fluoride and potassium fluoride and add them to a container, add deionized water to reach the said total volume, stir evenly to dissolve and obtain the polishing liquid for use. The inner side of the polishing pool 1 is provided with a titanium alloy acetabular prosthesis clamping and driving structure 4, the inner side of the titanium alloy acetabular prosthesis main body 2 is provided with a titanium alloy prosthesis small area clamping structure 5, and the bottom end of the inner wall of the polishing pool 1 is provided with a titanium alloy prosthesis clamping and positioning placement structure 6.

[0025] The titanium alloy acetabulum prosthesis clamping and driving structure 4 includes a clamping plate 41 and a movable groove 43. The clamping plate 41 is movably installed on the inner side of the polishing pool 1. The clamping plate 41 can be taken out and put down horizontally inside the polishing pool 1. The top of the clamping plate 41 is fixed with a movable groove 43. Two threaded columns 44 are rotatably connected on both sides of the inner side of the movable groove 43 through bearings. The outer sides of the two threaded columns 44 are threadedly connected to two moving blocks 45. The two ends of the two threaded columns 44 are fixedly connected to the screwing shaft 42.

[0026] When the titanium alloy acetabular prosthesis main body 2 needs to be clamped, the prepared titanium alloy acetabular prosthesis main body 2 is placed on the outside of the two arc blocks 53, and the operator manually twists the screwing shafts 42 on both sides to rotate, and the screwing shafts 42 will drive the two threaded columns 44 to rotate inside the clamping plate 41. The texture of the threaded columns 44 is opposite, so that the movable block 45 will slide parallel to the two ends of the clamping plate 41 along the limit of the movable groove 43, and the arc block 53 will provide a force to open to the outside to clamp the two sides of the inner wall of the titanium alloy acetabular prosthesis main body 2. The two threaded columns 44 are relatively mirrored. The side walls of the two movable blocks 45 are slidably connected to the inner side of the movable groove 43, and the bottom end of the titanium alloy acetabular prosthesis main body 2 is movably connected to the top end of the clamping plate 41, and the lower end of the clamping plate 41 is movably connected to the bottom end of the inner wall of the polishing pool 1;

[0027] The clamping plate 41 can be taken out and put down horizontally inside the polishing pool 1. When the titanium alloy acetabular prosthesis body 2 needs to be clamped, the prepared titanium alloy acetabular prosthesis body 2 is placed on the outside of the two arc blocks 53. The operator manually twists the screwing shafts 42 on both sides to rotate. The screwing shafts 42 will drive the two threaded columns 44 to rotate inside the clamping plate 41. The texture of the threaded columns 44 is opposite, so that the movable block 45 will slide parallel to the two ends of the clamping plate 41 along the limit of the movable groove 43. The arc block 53 will provide a supporting force to the outside to clamp the two sides of the inner wall of the titanium alloy acetabular prosthesis body 2. The clamping plate 41 can drive the conveniently fixed titanium alloy acetabular prosthesis body 2 to rise and fall vertically and smoothly in the polishing pool 1 filled with polishing liquid. The clamping plate 41 can fix the titanium alloy acetabular prosthesis, reduce the occurrence of titanium alloy prosthesis falling off and bumping due to relying on conventional metal clips, and improve the fixing effect of the clamping device for electrolyte plasma polishing of titanium alloy acetabular prosthesis.

[0028] The titanium alloy prosthesis small-area clamping structure 5 includes a vertical rod 51 and an arc block 53. The two arc blocks 53 are movably connected to both sides of the inner wall of the titanium alloy acetabular prosthesis main body 2. The lower ends of the two arc blocks 53 are fixedly installed with a connecting block 52. The arc block 53 is made of a stainless steel metal block with a certain curved arc near the outer side. The arc surface of the outer wall of the arc block 53 is fitted with the arc surface of the inner wall of the titanium alloy acetabular prosthesis. The vertical rod 51 fixes the connecting block 52 to the lower end movable block 45. Because the arc block 53 can match the curvature of the inner wall of the titanium alloy acetabular prosthesis, only a small contact area is required to achieve the clamping effect. Similarly, since the inner wall of the titanium alloy acetabular prosthesis is designed to be arc-shaped, the design of the arc block 53 does not need to consider the function of clamping the rectangular structure. The two vertical rods 51 are fixedly installed at the lower ends of the two connecting blocks 52, and the bottom ends of the two vertical rods 51 are fixedly connected to the top of the movable block 45. The two arc blocks 53 are arranged relatively parallel to each other.

[0029] The arc block 53 is made of a stainless steel metal block with a certain curved arc near the outside. The arc surface of the outer wall of the arc block 53 is fitted with the arc surface of the inner wall of the titanium alloy acetabular prosthesis. The vertical rod 51 fixes the connecting block 52 to the lower end movable block 45. Because the arc block 53 can match the curvature of the inner wall of the titanium alloy acetabular prosthesis, only a small contact area is required to achieve the clamping effect. Similarly, since the inner wall of the titanium alloy acetabular prosthesis is designed to be arc-shaped, the design of the arc block 53 does not need to consider the role of clamping the rectangular structure. In this way, the arc block can block and occupy a small part of the inner wall of the titanium alloy acetabular prosthesis main body 2, and the area of the position where polishing is not in place is small, and the subsequent impact is also relatively low, thereby improving the use effect of the clamping device for electrolyte plasma polishing of the titanium alloy acetabular prosthesis.

[0030] Working principle:

[0031] When using a clamping device for electrolyte plasma polishing of a titanium alloy acetabular prosthesis, the manufactured titanium alloy acetabular prosthesis is clamped and fixed above the clamping plate 41, and then placed in a polishing pool 1 filled with polishing liquid and completely immersed therein, the stainless steel plate is connected to the cathode of the power supply, wherein the surface area ratio of the stainless steel plate to the workpiece is greater than 8:1, the stainless steel plate is placed in the polishing liquid, the fixture holding the titanium alloy femoral stem prosthesis workpiece is placed above the polishing pool, the high-voltage DC power supply is turned on, a voltage of 290V is applied between the anode and cathode, the workpiece is completely immersed 10cm below the surface of the polishing liquid at a descending speed of 5cm / s, and the current density on the surface of the workpiece is finally maintained at 0.35A / cm 2 A stable gas layer completely covering the workpiece is formed on the surface of the workpiece, and the gas layer is broken down and discharged to generate plasma, and the titanium alloy femoral stem prosthesis to be polished is polished for 10 minutes;

[0032] Titanium alloy acetabular prosthesis clamping device of electrolyte plasma polishing has a strong structure:

[0033] The clamping plate 41 can be taken out and put down horizontally in the polishing pool 1. When the titanium alloy acetabular prosthesis main body 2 needs to be clamped, the prepared titanium alloy acetabular prosthesis main body 2 is placed on the outside of the two arc blocks 53. The operator manually twists the screwing shafts 42 on both sides to rotate, and the screwing shafts 42 will drive the two threaded columns 44 to rotate inside the clamping plate 41. The texture of the threaded columns 44 is opposite, so that the movable block 45 will slide parallel to the two ends of the clamping plate 41 along the limit of the movable groove 43. The arc block 53 will provide a force to open to the outside to clamp the two sides of the inner wall of the titanium alloy acetabular prosthesis main body 2. The clamping plate 41 can drive the conveniently fixed titanium alloy acetabular prosthesis main body 2 to rise and fall vertically and smoothly in the polishing pool 1 filled with polishing liquid. The clamping plate 41 can fix the titanium alloy acetabular prosthesis, reducing the situation where the titanium alloy prosthesis falls off and bumps due to relying on conventional metal clips;

[0034] Small footprint clamping structure of the clamping device for electrolyte plasma polishing of titanium alloy acetabular prosthesis:

[0035] The arc block 53 is made of a stainless steel metal block with a certain curved arc near the outside. The arc surface of the outer wall of the arc block 53 fits with the arc surface of the inner wall of the titanium alloy acetabular prosthesis. The vertical rod 51 fixes the connecting block 52 to the lower end movable block 45. Because the arc block 53 can match the curvature of the inner wall of the titanium alloy acetabular prosthesis, only a small contact area is required to achieve the clamping effect. Similarly, since the inner wall of the titanium alloy acetabular prosthesis is designed to be arc-shaped, the design of the arc block 53 does not need to consider the role of the clamping rectangular structure. In this way, the arc block can block and occupy a small part of the inner wall of the titanium alloy acetabular prosthesis main body 2, and the area of the position that is not polished is small, and the subsequent impact is also relatively low.

[0036] Example 2:

[0037] See also Figure 1-6 : In this embodiment, a clamping device for electrolyte plasma polishing of a titanium alloy acetabular prosthesis also includes a titanium alloy prosthesis clamping positioning and placement structure 6 including a transverse plate 61 and a limiting protrusion 65. A plurality of limiting protrusions 65 are fixedly mounted on the inner wall of the bottom end of the polishing pool 1. The outer sides of the plurality of limiting protrusions 65 are movably connected with a plurality of through holes 64. The through holes 64 on the bottom surface of the clamping plate 41 can be aligned with the limiting protrusions 65 below and fall in sequence. This ensures that the clamping plate 41 with the fixed titanium alloy acetabular prosthesis body 2 is placed exactly in the center of the polishing pool 1 filled with polishing liquid. The plurality of through holes 64 is fixedly opened at the bottom end of the clamping plate 41, and the two horizontal plates 61 are fixedly installed on both sides of the outer wall of the clamping plate 41. The horizontal plate 61 fixes the two vertical plates 62 on the left and right sides of the clamping plate 41. The top of the vertical plate 62 is made of rubber material. The holding rod 63 can be easily grasped by the operator and then manually driven to pull out or put the clamping plate 41 in the polishing pool 1, so that the operator's hand is not easy to accidentally touch the polishing liquid and cause danger. The other end of the two horizontal plates 61 is fixedly connected to two vertical plates 62, and the top of the two vertical plates 62 is fixedly installed with a holding rod 63.

[0038] Working principle:

[0039] The through hole 64 on the bottom surface of the clamping plate 41 can be aligned with the lower limiting protrusion 65 and fall down in sequence, so as to ensure that the clamping plate 41 with the fixed titanium alloy acetabulum prosthesis body 2 is placed exactly in the center of the polishing pool 1 filled with polishing liquid. The horizontal plate 61 fixes the two vertical plates 62 on the left and right sides of the clamping plate 41. The top of the vertical plate 62 is made of rubber material. The holding rod 63 can be easily grasped by the operator and then manually driven to pull out or put in the polishing pool 1, so that the operator's hand is not easily accidentally touched by the polishing liquid and cause danger.

[0040] While the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A clamping device for electrolyte plasma polishing of a titanium alloy acetabular prosthesis, comprising a polishing pool (1), a titanium alloy acetabular prosthesis body (2) and a heating tube (3), wherein a plurality of the heating tubes (3) are fixedly mounted on the inner wall of the polishing pool (1), characterized in that: A titanium alloy acetabular prosthesis clamping and driving structure (4) is provided on the inner side of the polishing pool (1), a titanium alloy prosthesis small-area clamping structure (5) is provided on the inner side of the titanium alloy acetabular prosthesis body (2), and a titanium alloy prosthesis clamping, positioning, and placement structure (6) is provided at the bottom end of the inner wall of the polishing pool (1).

2. The clamping device for electrolyte plasma polishing of a titanium alloy acetabular prosthesis according to claim 1, characterized in that: The titanium alloy acetabulum prosthesis clamping and driving structure (4) comprises a clamping plate (41) and a movable groove (43), wherein the clamping plate (41) is movably mounted on the inner side of the polishing pool (1), and the top end of the clamping plate (41) is fixedly provided with a movable groove (43), and two threaded columns (44) are rotatably connected to the inner sides of the movable groove (43) through bearings, and the outer sides of the two threaded columns (44) are threadedly connected to two moving blocks (45), and the two ends of the two threaded columns (44) are fixedly connected to a screwing shaft (42).

3. The clamping device for electrolyte plasma polishing of a titanium alloy acetabular prosthesis according to claim 2, characterized in that: The two threaded columns (44) are arranged in a mirror image relative to each other, the side walls of the two moving blocks (45) are slidably connected to the inner side of the movable groove (43), the bottom end of the titanium alloy acetabulum prosthesis body (2) is movably connected to the top end of the clamping plate (41), and the lower end of the clamping plate (41) is movably connected to the bottom end of the inner wall of the polishing pool (1).

4. The clamping device for electrolyte plasma polishing of a titanium alloy acetabular prosthesis according to claim 1, characterized in that: The titanium alloy prosthesis small-area clamping structure (5) comprises a vertical rod (51) and an arc block (53), wherein the two arc blocks (53) are movably connected to both sides of the inner wall of the titanium alloy acetabulum prosthesis body (2), the lower ends of the two arc blocks (53) are fixedly mounted with a connecting block (52), and the two vertical rods (51) are fixedly mounted on the lower ends of the two connecting blocks (52).

5. The clamping device for electrolyte plasma polishing of titanium alloy acetabular prosthesis according to claim 4, characterized in that: The bottom ends of the two vertical rods (51) are fixedly connected to the top end of the moving block (45), and the two arc-shaped blocks (53) are arranged relatively parallel to each other.

6. The clamping device for electrolyte plasma polishing of a titanium alloy acetabular prosthesis according to claim 1, characterized in that: The titanium alloy prosthesis clamping, positioning and placement structure (6) includes a transverse plate (61) and a limiting protrusion (65), and a plurality of the limiting protrusions (65) are fixedly installed on the inner wall of the bottom end of the polishing pool (1). The outer sides of the plurality of limiting protrusions (65) are movably connected with a plurality of through holes (64), and the plurality of through holes (64) are fixedly opened at the bottom end of the clamping plate (41). The two transverse plates (61) are fixedly installed on both sides of the outer wall of the clamping plate (41), and the other ends of the two transverse plates (61) are fixedly connected with two vertical plates (62), and the top ends of the two vertical plates (62) are fixedly installed with holding rods (63).

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