Heart stent surface polishing tool

Abstract

The utility model relates to a heart stent surface polishing tool which comprises a shell and at least three supporting structures, the at least three supporting structures are arranged in the shell in the circumferential direction of the shell, and the included angle between every two adjacent supporting structures is smaller than 180 degrees. One ends of the at least three supporting structures are fixedly connected with the shell, and a to-be-polished support placing position is formed among the other ends of the at least three supporting structures. According to the heart stent surface polishing tool, the supporting structure is arranged in the shell, the heart stent to be polished is limited in the placing position of the heart stent to be polished through the supporting structure, and the outer surface of the heart stent to be polished is exposed in the shell, so that the outer surface of the heart stent to be polished is prevented from making contact with the shell; the chemical polishing liquid can wash the surface of the heart stent to be polished when flowing in the shell, and polishing is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment processing, and in particular relates to a heart stent surface polishing tool. Background Art

[0002] Heart stents, also known as coronary artery stents, play an important role in the treatment of cardiovascular diseases. Their structure is a fine hollow mesh tube, and the materials are multi-component alloys such as 316L stainless steel, platinum-iridium alloy, magnesium-titanium alloy, nickel-titanium alloy, and magnesium-zinc alloy.

[0003] The existing technology uses electric spark, optical fiber and laser to process mesh on ultra-thin-wall alloy tubes to make blank heart stents. However, the surface of the blank heart stent obtained by this processing method is rough, with burrs and scratches. Defects such as burrs and scratches will potentially scratch or even pierce blood vessels, induce acute thrombosis, and endanger human safety. Therefore, the blank heart stent needs to be polished, but the existing technology lacks tooling for polishing the heart stent. Utility Model Content

[0004] In order to solve the above problems existing in the prior art, the utility model provides a heart stent surface polishing tool. The technical problem to be solved by the utility model is achieved through the following technical solutions:

[0005] A heart stent surface polishing tool, comprising: a shell and at least three supporting structures, wherein:

[0006] The at least three support structures are arranged inside the shell along the circumference of the shell, and the angle between every two adjacent support structures is less than 180 degrees;

[0007] One ends of the at least three supporting structures are fixedly connected to the shell, and a placement position for a support to be polished is formed between the other ends of the at least three supporting structures.

[0008] In a specific embodiment, the housing is a round tube;

[0009] The diameter of the shell is 2 to 2.5 times the diameter of the heart stent to be polished.

[0010] In a specific embodiment, the other end of each of the supporting structures is located on the same circumference.

[0011] In a specific embodiment, the length of the shell is 7 to 9 times the length of the heart stent to be polished.

[0012] In a specific embodiment, the support structure includes a first connecting portion, a second connecting portion and a supporting portion, wherein:

[0013] The first connection portion and the second connection portion are both perpendicularly pointed from the inner wall of the shell to the axis of the shell, and the first connection portion and the second connection portion are parallel to each other;

[0014] The support portion is arranged parallel to the axis of the shell, and one end of the support portion is connected to the end of the first connection portion, and the other end of the support portion is connected to the end of the second connection portion.

[0015] In a specific embodiment, the length of the support portion is 6 to 8 times the length of the heart stent to be polished.

[0016] In a specific embodiment, the cross-sectional shape of the support portion is circular, and the cross-sectional diameter of the support portion is 2 to 3 mm.

[0017] In a specific embodiment, the support structure further includes a limiting portion;

[0018] The limiting portion is located at one end of the supporting portion and extends from the surface of the supporting portion toward the center of the shell.

[0019] In a specific embodiment, the number of the support structures is three, and the angle between every two of the support structures is 120 degrees.

[0020] In a specific embodiment, the number of the supporting structures is four, and the angle between every two adjacent supporting structures is 90 degrees.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The utility model provides a heart stent surface polishing tool, which sets a support structure inside a shell, and limits the heart stent to be polished in a stent placement position to be polished through the support structure, so that the outer surface of the heart stent to be polished is exposed inside the shell, avoiding the outer surface of the heart stent to be polished from contacting the shell, so that the chemical polishing liquid can flush the surface of the heart stent to be polished when flowing inside the shell, thereby achieving polishing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a side view of a heart stent surface polishing tool provided by an embodiment of the utility model;

[0024] Figure 2 It is a side view of another heart stent surface polishing tool provided by an embodiment of the utility model;

[0025] Figure 3 It is a side view of another heart stent surface polishing tool provided by an embodiment of the utility model;

[0026] Figure 4This is a front view of another heart stent surface polishing tool provided by an embodiment of the utility model;

[0027] Figure 5 It is a structural schematic diagram of a support structure provided by an embodiment of the utility model.

[0028] Reference numerals:

[0029] 1: Shell; 2: Support structure; 21: First connection part; 22: Second connection part; 23: Support part; 24: Limiting part; 3: Position for placing the stent to be polished; 4: Heart stent to be polished. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with specific embodiments, but the implementation methods of the present invention are not limited thereto.

[0031] Embodiment 1

[0032] See also Figure 1 , Figure 1 It is a side view of a heart stent surface polishing tool provided by an embodiment of the utility model.

[0033] The present embodiment provides a heart stent surface polishing tooling, comprising: a shell 1 and at least three support structures 2, wherein the at least three support structures 2 are arranged inside the shell 1 along the circumference of the shell 1, and the angle between every two adjacent support structures 2 is less than 180 degrees. One end of the at least three support structures 2 is fixedly connected to the shell 1, and the other ends of the at least three support structures 2 form a stent placement position 3 to be polished.

[0034] Specifically, at least three support structures 2 are fixedly arranged inside the shell 1, and the support structures 2 are distributed along the circumference of the shell 1, and each support structure 2 points to the center of the shell 1, that is, the radial extension line of each support structure 2 along the shell 1 intersects at the center of the shell 1. During polishing, the heart stent 4 to be polished enters from one end of the shell 1 and is placed in the stent placement position 3 to be polished, and the chemical polishing liquid flows in from one end of the shell 1 to polish the inner and outer surfaces of the heart stent 4 to be polished. Since the angle between every two adjacent support structures 2 is less than 180 degrees, at least three support structures 2 can apply support forces along the four directions of the Z axis and the Y axis to the heart stent 4 to be polished, and the heart stent 4 to be polished is confined in the stent placement position 3 to be polished, so as to avoid the problem of inadequate polishing caused by the outer surface of the heart stent 4 to be polished contacting the shell 1.

[0035] In this embodiment, the shell 1 is a round tube. The diameter of the shell 1 is 2 to 2.5 times the diameter of the heart stent 4 to be polished. The length of the shell 1 is 7 to 9 times the length of the heart stent 4 to be polished. The other end of each support structure 2 is located on the same circumference. A circular stent placement position 3 to be polished is formed between the other ends of at least three support structures 2. It should be understood that the diameter of the stent placement position 3 to be polished is greater than the diameter of the heart stent 4 to be polished.

[0036] Specifically, the shell 1 is a hollow cylinder, which can make the chemical polishing liquid more fluid in the shell 1 and achieve a better polishing effect. During polishing, 5 to 7 heart stents 4 to be polished are sequentially placed inside the shell 1 and polished simultaneously.

[0037] In an achievable manner, the distance between every two adjacent support structures 2 is equal, that is, at least three support structures 2 are evenly distributed along the circumference of the housing 1, and the angles between every two adjacent support structures 2 are equal.

[0038] like Figure 2 As shown, in an achievable manner, the number of the support structures 2 is three, and the angle between every two support structures 2 is 120 degrees. The three support structures 2 apply support forces along four directions of the Z axis and the Y axis to the heart stent 4 to be polished, and the heart stent 4 to be polished is confined in the stent placement position 3 to be polished, so as to achieve polishing of the surface of the heart stent 4 to be polished.

[0039] like Figure 3 As shown, in an achievable manner, the number of the support structures 2 is four, and the angle between each two adjacent support structures 2 is 90 degrees. The four support structures 2 apply support forces along the four directions of the Z axis and the Y axis to the heart stent 4 to be polished, which can make the heart stent 4 to be polished more stable in the stent placement position 3 to be polished.

[0040] like Figure 4 and Figure 5 As shown, the support structure 2 provided in this embodiment includes a first connection portion 21, a second connection portion 22 and a support portion 23. Among them, the first connection portion 21 and the second connection portion 22 are both perpendicular to the axis of the shell 1 from the inner wall of the shell 1, and the first connection portion 21 and the second connection portion 22 are parallel to each other. The support portion 23 is arranged parallel to the axis of the shell 1, and one end of the support portion 23 is connected to the end of the first connection portion 21, and the other end of the support portion 23 is connected to the end of the second connection portion 22. The length of the support portion 23 is 6 to 8 times the length of the heart stent 4 to be polished. The cross-sectional shape of the support portion 23 is circular, and the cross-sectional diameter of the support portion 23 is 2 to 3 mm.

[0041] Specifically, along the X-axis direction, i.e., the axial direction of the housing 1, the second connection portion 22 is disposed on one side of the first connection portion 21, and the support portion 23 is disposed along the X-axis direction on the ends of the first connection portion 21 and the second connection portion 22. The support portion 23 applies a supporting force to the heart stent 4 to be polished, so as to confine the heart stent 4 to be polished in the stent placement position 3 to be polished.

[0042] Furthermore, the support structure 2 further includes a limiting portion 24. The limiting portion 24 is located at one end of the support portion 23 and extends from the surface of the support portion 23 toward the center of the housing 1.

[0043] In an achievable manner, the shell 1 and the support structure 2 are both made of tetrafluoroethylene. The shell 1 and the support structure 2 are fixedly connected by an adhesive.

[0044] Specifically, during polishing, 5 to 7 heart stents 4 to be polished sequentially enter the interior of the housing 1 from one end of the housing 1, and are limited by the support portion 23 in the placement position 3 of the stent to be polished. The chemical polishing liquid enters from one end of the housing 1, flows through the surface of the heart stent 4 to be polished, and then flows out from the other end of the housing 1. During the polishing process, in order to prevent the heart stent 4 to be polished from axial displacement under the flushing of the chemical polishing liquid, a limiting portion 24 is provided at one end of the support portion 23 in this embodiment. It should be understood that in order to achieve the limiting function, the height of the limiting portion 24 is greater than the difference between the diameter of the circle where the support portion 23 is located and the diameter of the heart stent 4 to be polished. The end of the shell 1 away from the limiting portion 24 is the inlet end, and the end of the shell 1 close to the limiting portion 24 is the outlet end. When polishing, the heart stent 4 to be polished enters from the inlet end of the shell 1, and is limited by the supporting portion 23 in the placement position 3 of the stent to be polished. The chemical polishing liquid enters from the inlet end of the shell 1, flows through the surface of the heart stent 4 to be polished, and then flows out from the outlet end of the shell 1. The limiting portion 24 can ensure that the heart stent 4 to be polished will not flow out from the outlet end of the shell 1 under the flushing of the chemical polishing liquid.

[0045] The steps of using a heart stent surface polishing tool provided in this embodiment include:

[0046] S1: preparing chemical polishing solution.

[0047] Specifically, step S1 includes:

[0048] S11: 80 mL to 120 mL of glycerol and 50 to 80 mL of water are measured and poured into a beaker. In this embodiment, glycerol is used as a corrosion inhibitor, and the reaction rate is controlled by increasing or decreasing the amount of glycerol added. If there is too little glycerol, the reaction rate is too fast and may even cause the solution to corrode the parts. On the contrary, if there is too much glycerol, the rate is too slow and the corrosion effect may not be achieved.

[0049] S12: Measure 80 mL to 120 mL of 37% hydrochloric acid, 330 mL to 370 mL of 65% nitric acid, 480 mL to 520 mL of 85% phosphoric acid, 80 mL to 120 mL of 98% sulfuric acid, and 3 to 5 g / L of nicotinic acid, and pour them into a beaker. In this embodiment, hydrochloric acid is used as a solvent, and the dissolution rate of the parts is controlled by increasing or decreasing the amount of addition. If the amount of hydrochloric acid is too little, the dissolution rate is too slow and the dissolution effect cannot be achieved. On the contrary, if the amount of hydrochloric acid is too much, the rate is too fast and the parts may even be dissolved. Nitric acid has a strong oxidizing effect. If too much is added, the oxidizing effect is too strong and the solution may even corrode the parts. If too little is added, the oxidizing effect is too weak and the reaction rate is too slow. Phosphoric acid has corrosion inhibition and buffering effects. The reaction rate can be controlled by increasing or decreasing the amount of addition. If too little is added, the reaction rate is too fast and the solution may even corrode the parts. On the contrary, if too much is added, the rate is too slow and the corrosion effect may not be achieved. Sulfuric acid can activate the metal surface, make the polishing more uniform, improve the leveling and speed up the polishing rate. Adding too much or too little will reduce the activity of the metal surface and slow down the reaction rate. Nicotinic acid is used as a brightener and adding too much or too little will affect the brightness of the part surface.

[0050] S13: Stir the materials in the beaker with an impeller for 20 minutes to make the materials in the beaker evenly mixed. The impeller speed is 300 rpm.

[0051] S14: Weigh 30-40 g / L of sodium benzoate and 3-8 g / L of sodium polyacrylate respectively, pour them into a beaker, and stir them evenly until they are completely dissolved to obtain a chemical polishing solution. In this embodiment, adding too much or too little sodium benzoate as a brightener will affect the brightness of the surface of the part, and adding too much or too little sodium polyacrylate as a surfactant will reduce the activity of the surface and cause a decrease in the reaction rate.

[0052] S2: Push the heart stent 4 to be polished from the inlet end of the housing 1 into the stent placement position 3 to be polished.

[0053] S3: The chemical polishing liquid is pumped into the housing 1 from one end, flows through the heart stent 4 to be polished, and then flows out from the other end of the housing 1. An electromagnetic flowmeter is installed at the outflow end of the housing 1 to record the flow change of the chemical polishing liquid at the outlet end. The temperature of the chemical polishing liquid is controlled to be 25-30°C.

[0054] S4: By establishing the relationship between the flow rate of the chemical polishing liquid at the outlet of the shell 1 and the surface roughness of the heart stent blank, the purpose of determining the critical point of chemical polishing by monitoring the flow rate at the outlet of the shell 1 is achieved. In this embodiment, when the flow rate of the chemical polishing liquid at the outlet of the shell 1 reaches 110 mL / min to 120 mL / min, the surface roughness Ra of the heart stent reaches 0.1 to 0.2 μm.

[0055] S5: After the chemical polishing, rinse the heart stent with dilute nitric acid, dilute ammonia water, and deionized water in turn, and then blow dry.

[0056] The present embodiment provides a heart stent surface polishing tool, which sets a support structure 2 inside a shell 1, and limits the heart stent 4 to be polished in a stent placement position 3 to be polished through the support structure 2, so that the outer surface of the heart stent 4 to be polished is exposed inside the shell 1, avoiding the outer surface of the heart stent 4 to be polished from contacting the shell 1, so that the chemical polishing liquid can flush the surface of the heart stent 4 to be polished when flowing inside the shell 1, thereby achieving polishing.

[0057] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A heart stent surface polishing tool, characterized in that: include: a housing and at least three support structures, wherein: The at least three support structures are arranged inside the shell along the circumference of the shell, and the angle between every two adjacent support structures is less than 180 degrees; One ends of the at least three supporting structures are fixedly connected to the shell, and a placement position for a support to be polished is formed between the other ends of the at least three supporting structures.

2. A heart stent surface polishing tool according to claim 1, characterized in that: The shell is a round tube; The diameter of the shell is 2 to 2.5 times the diameter of the heart stent to be polished.

3. A heart stent surface polishing tool according to claim 1, characterized in that: The other end of each of the supporting structures is located on the same circumference.

4. A heart stent surface polishing tool according to claim 1, characterized in that: The length of the shell is 7 to 9 times the length of the heart stent to be polished.

5. A heart stent surface polishing tool according to claim 1, characterized in that: The support structure comprises a first connecting portion, a second connecting portion and a supporting portion, wherein: The first connection portion and the second connection portion are both perpendicularly pointed from the inner wall of the shell to the axis of the shell, and the first connection portion and the second connection portion are parallel to each other; The support portion is arranged parallel to the axis of the shell, and one end of the support portion is connected to the end of the first connection portion, and the other end of the support portion is connected to the end of the second connection portion.

6. A heart stent surface polishing tool according to claim 5, characterized in that: The length of the support portion is 6 to 8 times the length of the heart stent to be polished.

7. A heart stent surface polishing tool according to claim 5, characterized in that: The cross-sectional shape of the support portion is circular, and the cross-sectional diameter of the support portion is 2 to 3 mm.

8. A heart stent surface polishing tool according to claim 5, characterized in that: The support structure also includes a limiting portion; The limiting portion is located at one end of the supporting portion and extends from the surface of the supporting portion toward the center of the shell.

9. A heart stent surface polishing tool according to claim 1, characterized in that: The number of the supporting structures is three, and the angle between every two supporting structures is 120 degrees.

10. A heart stent surface polishing tool according to claim 1, characterized in that: The number of the supporting structures is four, and the angle between every two adjacent supporting structures is 90 degrees.

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