Medical metal pipe with holes or hollow patterns and its manufacturing method

Abstract

A medical metal tube with holes or hollowed-out patterns and its manufacturing method. The manufacturing method includes the following steps: providing a nickel-titanium alloy metal rod; drilling the nickel-titanium alloy metal rod to form a hollow nickel-titanium alloy shell; inserting a metal wire into the nickel-titanium alloy shell to form a composite blank; performing cold drawing forming treatment on the composite blank to form a composite metal rod; performing hole-opening treatment on the nickel-titanium alloy shell on the outer layer of the composite metal rod to form a preset hole-shaped structure or a preset hollowed-out pattern; removing the metal wire from the composite tube to form the nickel-titanium alloy tube with holes or hollowed-out patterns. In the manufacturing method of the above nickel-titanium alloy tube with holes or hollowed-out patterns, due to the support of the metal wire, it is not easy to deform during the hole-opening treatment, and the accuracy of the hole-opening treatment can be better guaranteed. Moreover, through the cold drawing forming treatment, the wall thickness can be better controlled, thereby further improving the processing accuracy, and the processing efficiency is good, reducing the processing difficulty.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe processing, and particularly to a medical metal pipe with holes or hollow patterns and a manufacturing method thereof. Background Art

[0002] Nickel-titanium shape memory alloy has excellent properties such as superelasticity, wear resistance, corrosion resistance, fatigue resistance, biocompatibility, and plasticity, and is widely used in industries such as aerospace, machinery, automotive, civil engineering, energy, medical devices, and electronics. Due to the high hardness and high work hardening rate of nickel-titanium alloy, it is difficult to process nickel-titanium alloy, especially for the processing of porous or hollow-patterned ring-shaped and long-tube-shaped nickel-titanium alloy products, such as nickel-titanium alloy porous filters, adsorbent supports, etc. At the same time, it also makes the dimensional accuracy of nickel-titanium alloy bar products with outer shells relatively low. Summary of the Invention

[0003] Based on this, it is necessary to provide a medical metal pipe with holes or hollow patterns that can reduce the production difficulty and has high dimensional accuracy, and a manufacturing method thereof.

[0004] In a first aspect, the present application provides a manufacturing method of a medical metal pipe with holes or hollow patterns, including the following steps:

[0005] Provide a nickel-titanium alloy metal rod;

[0006] Drill holes in the nickel-titanium alloy metal rod to form a hollow nickel-titanium alloy outer shell;

[0007] Insert a metal wire into the nickel-titanium alloy outer shell to form a composite blank, wherein the outer diameter of the metal wire is 0.01 mm to 3 mm smaller than the inner diameter of the nickel-titanium alloy outer shell;

[0008] Perform cold drawing forming treatment on the composite blank to form a composite metal rod; wherein, after cold drawing forming, the nickel-titanium alloy outer shell and the metal wire are tightly combined together;

[0009] Perform hole opening treatment on the nickel-titanium alloy outer shell on the outer layer of the composite metal rod to form a preset hole structure or a preset hollow pattern;

[0010] Take out the metal wire from the composite pipe to form the medical metal pipe with holes or hollow patterns.

[0011] In one embodiment, the outer diameter of the nickel-titanium alloy outer shell is 3 to 40 mm.

[0012] In one embodiment, the material of the metal wire is stainless steel, nickel-titanium alloy, high-speed steel or cobalt-chromium alloy;

[0013] In one embodiment, in the composite blank, the lengths of the titanium alloy outer shell tube and the metal wire are equal.

[0014] In one embodiment, in the cold drawing forming, the cold drawing deformation amount is 10% - 75%, preferably 30% - 40%.

[0015] In one embodiment, in the metal rod formed after cold drawing forming, the wall thickness of the outer nickel-titanium alloy shell after cold drawing forming is 0.02 mm to 5 mm.

[0016] In one embodiment, after cold drawing forming and before the hole-opening treatment, the manufacturing method further includes: straightening the composite metal rod, wherein the straightening temperature is 400 - 700 °C;

[0017] In one embodiment, after the straightening treatment and before the hole-opening treatment, the manufacturing method further includes: performing a surface brightening treatment on the composite metal rod, and the surface brightening treatment method is at least one of grinding, mechanical polishing, chemical treatment, and electro-polishing;

[0018] In one embodiment, the surface brightening treatment step is after the straightening treatment step;

[0019] In one embodiment, after the hole-opening treatment, the manufacturing method further includes: removing the residues after the hole-opening treatment and reducing the surface roughness of the composite metal rod by means of sandblasting, mechanical polishing, chemical treatment, or electro-polishing.

[0020] In one embodiment, the length of the formed composite metal rod is suitable for manufacturing multiple nickel-titanium alloy tubes with holes or hollow patterns. After the cold drawing forming and before any one of the straightening treatment, the surface brightening treatment, and the hole-opening treatment, the manufacturing method further includes: performing a truncation treatment on the composite metal rod to form multiple truncated composite metal rods, and each truncated composite metal rod is suitable for manufacturing a single nickel-titanium alloy tube with holes or hollow patterns.

[0021] In one embodiment, the hole-opening treatment is a laser hole-opening treatment;

[0022] In one embodiment, in the hole-opening treatment, both ends of the composite metal rod are not subjected to the hole-opening treatment, and the lengths of the two ends not subjected to the hole-opening treatment are both 0.3 - 10 cm. After the hole-opening treatment, the manufacturing method further includes: truncating and removing the two ends not subjected to the hole-opening treatment.

[0023] The manufacturing method of the above nickel-titanium alloy tube with holes or hollow patterns forms a composite blank by inserting a metal wire into the nickel-titanium alloy shell, and then undergoes cold drawing forming treatment to form a composite metal rod, making the nickel-titanium alloy shell and the metal wire tightly combined. Then, the nickel-titanium alloy shell on the outer layer of the composite metal rod is subjected to hole-opening treatment to form a preset hole-shaped structure or a preset hollow pattern. Due to the support of the metal wire, it is not easy to deform during the hole-opening treatment, and the accuracy of the hole-opening treatment can be better guaranteed. Moreover, through the cold drawing forming treatment, the wall thickness can be better controlled, further improving the processing accuracy, with good processing efficiency and reduced processing difficulty. When laser hole-opening treatment is used, the minimum thickness of various products processed by this method can reach 0.02 mm, and it can be processed according to the actual needs of various products. This method reduces the processing difficulty of nickel-titanium alloy products with holes or hollow patterns, improves the processing efficiency, and improves the dimensional accuracy of nickel-titanium alloy products.

[0024] In a second aspect, the present application also provides a nickel-titanium alloy tube with holes or hollow patterns, which is prepared by using the manufacturing method described in any one of the above embodiments.

[0025] In one of the embodiments, it is used for a porous filter or an adsorbent support.

[0026] The above nickel-titanium alloy tube with holes or hollow patterns uses the above preparation method, and the dimensional accuracy of the processed nickel-titanium alloy tube with holes or hollow patterns can be guaranteed, the production difficulty can be reduced, the processing efficiency can be improved, and the dimensional accuracy of the nickel-titanium alloy product can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of a process in the manufacturing method of a nickel-titanium alloy tube with holes or hollow patterns according to an embodiment of the present invention;

[0028] Figure 2a It is a schematic diagram of a process in the manufacturing method of a nickel-titanium alloy tube with holes or hollow patterns according to an embodiment of the present invention;

[0029] Figure 2b It is a schematic diagram of a process in the manufacturing method of a nickel-titanium alloy tube with holes or hollow patterns according to an embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of a process in the manufacturing method of a nickel-titanium alloy tube with holes or hollow patterns according to an embodiment of the present invention;

[0031] Figure 4 It is a schematic diagram of a process in the manufacturing method of a nickel-titanium alloy tube with holes or hollow patterns according to an embodiment of the present invention;

[0032] Figure 5 Schematic diagram of a process in the method for manufacturing a nickel-titanium alloy tube with holes or hollowed-out patterns according to an embodiment of the present invention;

[0033] Figure 6 Schematic diagram of a process in the method for manufacturing a nickel-titanium alloy tube with holes or hollowed-out patterns according to an embodiment of the present invention;

[0034] Figure 7 Schematic diagram of a process in the method for manufacturing a nickel-titanium alloy tube with holes or hollowed-out patterns according to an embodiment of the present invention;

[0035] Figure 8 Schematic diagram of a process in the method for manufacturing a nickel-titanium alloy tube with holes or hollowed-out patterns according to an embodiment of the present invention;

[0036] Figure 9a Schematic diagram of a process in the method for manufacturing a nickel-titanium alloy tube with holes or hollowed-out patterns according to an embodiment of the present invention;

[0037] Figure 9b Schematic diagram of a process in the method for manufacturing a nickel-titanium alloy tube with holes or hollowed-out patterns according to an embodiment of the present invention;

[0038] Figure 9c Schematic diagram of a process in the method for manufacturing a nickel-titanium alloy tube with holes or hollowed-out patterns according to an embodiment of the present invention;

[0039] Figure 10 Schematic diagram of the nickel-titanium alloy tube with holes or hollowed-out patterns prepared by the method for manufacturing a nickel-titanium alloy tube with holes or hollowed-out patterns according to an embodiment of the present invention;

[0040] Figure 11 is Figure 10 Schematic diagram after the size of the nickel-titanium alloy tube with holes or hollowed-out patterns is enlarged. Detailed implementation mode

[0041] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive. It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0042] In a first aspect, the present application provides a method for manufacturing a nickel-titanium alloy tube with holes or hollow patterns, including the following steps:

[0043] S100: Provide a nickel-titanium alloy metal rod;

[0044] S200: Drill the nickel-titanium alloy metal rod to form a hollow nickel-titanium alloy outer shell;

[0045] In this step, by drilling the nickel-titanium alloy metal rod, a hollow nickel-titanium alloy outer shell with openings at both ends is formed;

[0046] Specifically, an electric discharge machining machine is used to drill the nickel-titanium alloy metal rod. After drilling, the inner hole of the nickel-titanium alloy metal rod is processed, or the inner hole and the outer wall are formed in one step. Further, a wire cutting machine tool can be used for cutting processing, a boring tool for boring, etc. to obtain an inner hole with the required dimensions. Further, the outer wall can be processed by a wire cutting machine tool and a grinding machine.

[0047] Specifically, the outer diameter of the nickel-titanium alloy outer shell is 3 to 40 mm.

[0048] In one embodiment, the outer diameter of the nickel-titanium alloy outer shell is 3 to 40 mm. Such dimensions facilitate the subsequent preparation of a nickel-titanium alloy tube with holes or hollow patterns. Of course, the dimensions of the outer diameter of the nickel-titanium alloy outer shell are not limited to this.

[0049] In one embodiment, the wall thickness of the nickel-titanium alloy outer shell is from 0.025 mm to 50 mm. Preferably, the wall thickness of the nickel-titanium alloy outer shell is from 0.05 mm to 20 mm. Thus, by using a nickel-titanium alloy outer shell of such dimensions, it is convenient to ensure the wall thickness of the nickel-titanium alloy tube with holes or hollow patterns formed by subsequent cold drawing treatment.

[0050] S300: Insert a metal wire into the nickel-titanium alloy outer shell to form a composite blank, wherein the outer diameter of the metal wire is 0.01 mm to 3 mm smaller than the inner diameter of the nickel-titanium alloy outer shell;

[0051] In this application, by inserting a metal wire into the nickel-titanium alloy outer shell to form a composite blank and through subsequent integrated drawing / cold drawing treatment, it is convenient for the metal wire located inside to play a certain supporting role during the subsequent hole opening of the nickel-titanium alloy outer shell, and thus the subsequent processing accuracy can be ensured. By making the outer diameter of the metal wire 0.01 mm to 3 mm smaller than the inner diameter of the nickel-titanium alloy outer shell, the metal wire can play a better supporting role.

[0052] Specifically, the material of the metal wire is stainless steel, nickel-titanium alloy, high-speed steel or cobalt-chromium alloy;

[0053] Specifically, in the composite blank, the lengths of the titanium alloy outer shell tube and the metal wire are equal.

[0054] By inserting a metal wire / rod with an outer diameter slightly smaller than the inner diameter of the nickel-titanium alloy outer shell into the hollow structure of the outer shell. The composite blank is divided into two layers, namely, the inner layer is the metal wire / rod and the outer layer is the nickel-titanium alloy outer shell. The outer diameter of the metal wire / rod is 0.01 to 3 mm smaller than the inner diameter of the nickel-titanium alloy outer shell, and the outer diameter of the nickel-titanium alloy outer shell is 3 to 40 mm.

[0055] S400: Perform cold drawing forming treatment on the composite blank to form a composite metal rod; wherein, after cold drawing forming, the nickel-titanium alloy outer shell and the metal wire are tightly combined together;

[0056] Through cold drawing forming, the nickel-titanium alloy outer shell and the metal wire are tightly combined together, so that the metal wire can play a better supporting role in the subsequent hole opening of the nickel-titanium alloy outer shell. Moreover, during the drawing forming treatment, due to the presence of the metal wire, the wall thickness of the outer nickel-titanium alloy shell can be ensured to be uniform, thereby further improving the product accuracy.

[0057] In one embodiment, in the cold drawing forming process, the cold drawing deformation amount is 10%-75%, preferably 30%-40%. Preferably, in the metal rod formed after cold drawing forming, the wall thickness of the outer nickel-titanium alloy shell after cold drawing forming is 0.02 mm to 5 mm. In this embodiment, by making the outer diameter of the metal wire before drawing less than the inner diameter of the nickel-titanium alloy shell by 0.01 mm to 3 mm, and the cold drawing deformation amount after drawing is 10%-75%, the accuracy of subsequent products can be better guaranteed. Especially when the cold drawing deformation amount after drawing is 30%-40%, the processing accuracy is relatively high, which can further ensure the wall thickness and the accuracy of subsequent hole opening, and then ensure the accuracy of subsequent products.

[0058] In this embodiment, the composite blank composed of the metal wire / rod and the nickel-titanium alloy shell is cold drawn synchronously; the cold drawing deformation amount is 10%-75%, and the preferred deformation amount is 30%-40%. During the entire processing of this product, the internal metal wire / rod is not taken out, but the composite blank is synchronously drawn to reach the required size. After cold drawing is completed, the outer nickel-titanium alloy shell and the inner metal wire / rod are tightly combined together, called the metal rod with a shell, that is, the composite metal rod. The shell thickness of the nickel-titanium alloy shelled metal rod after drawing is 0.02 mm to 5 mm, and the diameter of the inner metal wire / rod is 0.2 mm to 30 mm.

[0059] Specifically, the composite blank composed of the metal wire / rod and the nickel-titanium alloy shell is integrally drawn and annealed once or several times, and the annealing temperature is 600-900°C; by integrally drawing and annealing the composite blank composed of the metal wire / rod and the nickel-titanium alloy shell once or several times, and the annealing temperature is 600-900°C; the accuracy of the product can be further improved.

[0060] S500: Perform hole opening treatment on the nickel-titanium alloy shell on the outer layer of the composite metal rod to form a preset hole structure or a preset hollow pattern;

[0061] In one embodiment, the hole opening treatment is laser hole opening treatment; thus, by using laser hole opening treatment, the processing accuracy can be further ensured.

[0062] In one embodiment, in the hole opening treatment, the two ends of the composite metal rod are not subjected to hole opening treatment, and the lengths of the two ends not subjected to hole opening treatment are both 0.3 to 10 cm. After the hole opening treatment, the manufacturing method further includes: cutting off and removing the two ends not subjected to hole opening treatment.

[0063] Specifically, a laser machine is used to perform laser processing on the outer shell part of a metal rod with a nickel-titanium alloy outer shell. The depth of the laser processing is the same as or slightly greater than the thickness of the outer shell. The laser processing area is 0.3 - 10 cm from both ends of the metal rod. After the laser processing is completed, the laser-processed part of the nickel-titanium alloy outer shell is the pattern of the required product, and the laser-processed part of the outer shell is no longer tightly combined with the inner metal wire / rod. Since the two ends of the metal rod with the outer shell are not laser-processed, although the laser-processed part of the metal rod with the outer shell is no longer tightly combined with the inner metal wire / rod, the un-laser-processed part of the outer shell is still tightly combined with the inner metal wire / rod. During the laser processing, the inner metal wire / rod provides internal support for the nickel-titanium alloy outer shell. This processing method improves the stability of product processing, is conducive to the stability of product dimensions, and makes the dimensions of the processed part more uniform. Using this method for laser processing, the thickness of various products can reach a minimum of 0.02 mm, and can be processed according to the actual needs of various products. This method reduces the processing difficulty of nickel-titanium alloy products with holes or hollow patterns, improves the processing efficiency, and improves the dimensional accuracy of nickel-titanium alloy products. In this embodiment, the un-laser-processed part of the outer shell is cut off by wire cutting or other means, and the remaining part that has been laser-processed is left. After removing the un-laser-processed part of the outer shell, the remaining laser-processed outer shell and the internal metal wire / rod are left.

[0064] Of course, in other embodiments, the two ends of the composite metal rod can also be similarly perforated, so that the two ends do not need to be truncated and removed, but the dimensional accuracy will decrease compared with the previous case.

[0065] In one of the embodiments, after the perforation treatment, the manufacturing method further includes: removing the residue after the perforation treatment and reducing the surface roughness of the composite metal rod by sandblasting, mechanical polishing, chemical treatment or electro-polishing. Due to the support of the inner metal wire / rod, during the processing of the nickel-titanium alloy outer shell, the outer shell is not easily deformed, thus ensuring the stability of the product dimensions.

[0066] S600: Taking out the metal wire from the composite tube to form the nickel-titanium alloy tube with holes or hollow patterns.

[0067] In this embodiment, since after the perforation treatment, or after laser processing, the outer shell is no longer tightly combined with the inner metal wire / rod, after the un-laser-processed part is truncated, the processed nickel-titanium alloy outer shell can be easily taken out from the inner metal wire / rod. The laser-processed nickel-titanium alloy outer shell is the various products required. The outer diameter of the product after laser processing, that is, the outer diameter of the metal rod with the nickel-titanium alloy outer shell, can be the same as the size of the final product, or can be inconsistent with the size of the final product.

[0068] When the size of the laser-processed outer shell is not the final size of the required product, the laser-processed outer shell can be heat-treated according to the requirements of the final product, and the heat treatment temperature is 400-600 °C. According to the requirements of the final product size, during the heating process of the nickel-titanium alloy outer shell, the size of the product may expand or contract. The size of the product after heat setting treatment is consistent with the final shape and size of the required product.

[0069] The manufacturing method of the above nickel-titanium alloy tube with holes or hollow patterns inserts a metal wire into the nickel-titanium alloy outer shell to form a composite blank, and performs cold drawing forming treatment to form a composite metal rod, so that the nickel-titanium alloy outer shell is tightly combined with the metal wire. Then, a preset hole structure or a preset hollow pattern is formed by perforating the nickel-titanium alloy outer shell on the outer layer of the composite metal rod. Due to the support of the metal wire, it is not easy to deform during the perforating process, and the accuracy of the perforating process can be better guaranteed. Moreover, through the cold drawing forming treatment, the wall thickness can be better controlled, thereby further improving the processing accuracy, and the processing efficiency is good, and the processing difficulty is reduced. When laser perforating treatment is adopted, the minimum thickness of various products processed by this method can reach 0.02 mm, and it can be processed according to the actual needs of various products. This method reduces the processing difficulty of nickel-titanium alloy products with holes or hollow patterns, improves the processing efficiency, and improves the dimensional accuracy of nickel-titanium alloy products.

[0070] In one embodiment, after cold drawing forming and before perforating treatment, the manufacturing method further includes: straightening the composite metal rod, wherein the straightening temperature is 400-700 °C; in this way, through the straightening treatment, the straightness of the composite metal rod is ensured, and local slight deformation that may occur during cold drawing forming is corrected, thereby further ensuring the product accuracy.

[0071] In one embodiment, after the straightening treatment and before the perforating treatment, the manufacturing method further includes: performing surface brightening treatment on the composite metal rod, and the surface brightening treatment method is at least one of grinding, mechanical polishing, chemical treatment, and electro-polishing; by performing surface treatment on the metal rod with an outer shell after straightening, the surface is brightened by means of grinding, mechanical polishing, chemical treatment, and electro-polishing.

[0072] In one embodiment, the surface brightening treatment step is after the straightening treatment step.

[0073] The control of the length of the composite metal rod of the present application can be used to manufacture multiple products at one time using the manufacturing method of the present application, or a single product can be manufactured at one time.

[0074] In one embodiment, the length of the composite metal rod formed is suitable for manufacturing a plurality of nickel-titanium alloy tubes with holes or hollowed-out patterns, that is, a plurality of products are manufactured at one time using the manufacturing method of the present application. Specifically, after the cold drawing forming, before any one of the straightening treatment, the surface brightening treatment, and the hole-opening treatment, the manufacturing method further includes: truncating the composite metal rod to form a plurality of truncated composite metal rods, and each truncated composite metal rod is suitable for manufacturing a single nickel-titanium alloy tube with holes or hollowed-out patterns. In this way, the metal rod with a nickel-titanium alloy outer shell can be truncated into the required length.

[0075] The manufacturing method of the above nickel-titanium alloy tube with holes or hollowed-out patterns inserts a metal wire into a nickel-titanium alloy outer shell to form a composite blank, and performs cold drawing forming treatment to form a composite metal rod, so that the nickel-titanium alloy outer shell and the metal wire are tightly combined together. Then, a preset hole structure or a preset hollowed-out pattern is formed by performing hole-opening treatment on the nickel-titanium alloy outer shell on the outer layer of the composite metal rod. Due to the support of the metal wire, it is not easy to deform during the hole-opening treatment, and the accuracy of the hole-opening treatment can be better guaranteed. Moreover, through the cold drawing forming treatment, the wall thickness can be better controlled, thereby further improving the processing accuracy, and the processing efficiency is good, and the processing difficulty is reduced. When laser hole-opening treatment is adopted, the minimum thickness of various products processed by using this method can reach 0.02 mm, and it can be processed according to the actual needs of various products. This method reduces the processing difficulty of nickel-titanium alloy products with holes or hollowed-out patterns, improves the processing efficiency, and improves the dimensional accuracy of nickel-titanium alloy products.

[0076] In a second aspect, the present application further provides a nickel-titanium alloy tube with holes or hollowed-out patterns, which is prepared by using the manufacturing method described in any one of the above embodiments.

[0077] In one embodiment, it is used for a porous filter or an adsorbent support.

[0078] The above nickel-titanium alloy tube with holes or hollowed-out patterns adopts the above preparation method, and the dimensional accuracy of the processed nickel-titanium alloy tube with holes or hollowed-out patterns can be guaranteed, the production difficulty can be reduced, the processing efficiency can be improved, and the dimensional accuracy of the nickel-titanium alloy product is improved.

[0079] In order to further illustrate the manufacturing method of the nickel-titanium alloy tube with holes or hollowed-out patterns of the present application, the following continues to be described in conjunction with specific embodiments and the accompanying drawings of the specification. Specific Embodiment

[0080] 1. Manufacturing a nickel-titanium alloy outer shell

[0081] Drill a nickel-titanium alloy metal rod using an electric discharge machining machine. After drilling, perform internal hole machining on the rod, or perform one-time forming machining on the internal hole and the outer wall. The required-sized internal hole can be obtained by methods such as wire cutting machining with a wire cutting machine and boring with a boring tool. The outer wall can be machined by a wire cutting machine or a grinding machine.

[0082] 2. Fabricate the composite blank

[0083] Insert a wire / rod with an outer diameter slightly smaller than the inner diameter of the nickel-titanium alloy outer shell into the hollow structure of the outer shell. The composite blank is divided into two layers, namely, the inner layer is the wire / rod and the outer layer is the nickel-titanium alloy outer shell. The outer diameter of the wire / rod is 0.01 - 3 mm smaller than the inner diameter of the nickel-titanium alloy outer shell, and the outer diameter of the nickel-titanium alloy outer shell is 3 - 40 mm. The material of the inner layer wire / rod is stainless steel, nickel-titanium alloy, high-speed steel, or cobalt-chromium alloy.

[0084] Please refer to Figure 1 , which is a schematic structural diagram of the nickel-titanium alloy outer shell. It can be seen from the figure that both ends thereof have openings and are tubular. Figure 2a In Figure 2b is a schematic diagram of the wire (left in the figure) and the nickel-titanium alloy outer shell (right in the figure), Figure 3 is a schematic diagram of the wire inserted into the nickel-titanium alloy outer shell,

[0085] 3. Perform integral drawing and single or multiple annealing on the composite blank composed of the wire / rod and the nickel-titanium alloy outer shell, and the annealing temperature is 600 - 900 °C;

[0086] Simultaneously perform cold drawing on the composite blank composed of the wire / rod and the nickel-titanium alloy outer shell; the cold drawing deformation amount is 10% - 75%, and the preferred deformation amount is 30% - 40%. During the entire processing of this product, the internal wire / rod is not taken out, but the composite blank is synchronously drawn to reach the required size. After cold drawing, the outer nickel-titanium alloy outer shell and the inner wire / rod are tightly combined together, which is called a metal rod with an outer shell (i.e., a composite metal rod). The outer shell thickness of the nickel-titanium alloy metal rod with an outer shell after drawing is 0.02 mm - 5 mm, and the diameter of the inner wire / rod is 0.2 mm - 30 mm. Figure 4 is a schematic diagram of the composite blank becoming thinner and longer after cold drawing / drawing treatment and the internal parts being tightly combined to form a composite metal rod.

[0087] 4. Straighten the drawn metal rod with an outer shell, and the straightening temperature is 400 - 700 °C.

[0088] 5. Perform surface treatment on the straightened metal rod with an outer shell, and the surface treatment method is to polish the surface brightly by grinding, mechanical polishing, chemical treatment, or electro-polishing.

[0089] 6. Cut the metal rod with a nickel-titanium alloy shell into the required length. Figure 5 To cut the metal rod with a shell into the required length.

[0090] 7. Use a laser machine to perform laser processing and open holes in the shell part of the metal rod with a nickel-titanium alloy shell. The depth of the laser processing is the same as or slightly greater than the thickness of the shell. The laser processing area is 0.3 - 10 cm from both ends of the metal rod. After the laser processing is completed, the laser processed part of the nickel-titanium alloy shell is the pattern of the required product, and the laser processed part of the shell is no longer tightly combined with the inner metal wire / rod. Since the two ends of the metal rod with a shell are not laser processed, although the laser processed part of the metal rod with a shell is no longer tightly combined with the inner metal wire / rod, the un-laser processed part of the shell is still tightly combined with the inner metal wire / rod. During the laser processing, the inner metal wire / rod provides internal support for the nickel-titanium alloy shell. This processing method improves the stability of product processing, is conducive to the stability of product dimensions, and makes the dimensions of the processed part more uniform.

[0091] The thickness of various products processed by this method can reach a minimum of 0.02 mm, and can be processed according to the actual needs of various products. This method reduces the processing difficulty of nickel-titanium alloy products with holes or hollow patterns, improves the processing efficiency, and improves the dimensional accuracy of nickel-titanium alloy products.

[0092] Figure 6 This is a schematic diagram of the product during the hole-opening process, with some parts having completed the hole-opening. Figure 7 This is a semi-finished product of the position of the already hole-opened part (no processing at both ends)

[0093] 8. Use sandblasting, mechanical polishing, chemical treatment, electro-polishing and other methods to remove the residues at the laser processing area of the product and reduce the surface roughness of the product. Due to the support of the inner metal wire / rod, during the processing of the nickel-titanium alloy shell, the shell is not easily deformed, thus ensuring the stability of product dimensions.

[0094] 9. Use wire cutting and other methods to cut off the un-laser processed part of the shell, leaving the already laser processed part. After removing the un-laser processed part of the shell, the remaining part is the laser processed shell and the inner metal wire / rod. Since after laser processing, the shell is no longer tightly combined with the inner metal wire / rod, after cutting off the un-laser processed part, the processed nickel-titanium alloy shell can be easily taken out from the inner metal wire / rod. The laser processed nickel-titanium alloy shell is the required various products. The outer diameter of the product after laser processing, that is, the outer diameter of the metal rod with a nickel-titanium alloy shell, can be the same as the size of the final product or can be different from the size of the final product.

[0095] Figure 9a 、 Figure 9b 、 Figure 9c is a schematic process diagram for removing the nickel-titanium alloy shell.

[0096] Figure 10 is a schematic structural diagram of a nickel-titanium alloy tube with holes or hollowed-out patterns formed.

[0097] 10. When the size of the laser-processed shell is not the final size of the required product, the laser-processed shell can be heat-treated according to the requirements of the final product, and the heat treatment temperature is 400 - 600 °C. According to the requirements of the final product size, during the heating process of the nickel-titanium alloy shell, the size of the product may expand or shrink. The size of the product after heat setting treatment is consistent with the final shape and size of the required product. Figure 11 is a schematic diagram after proper heat treatment for hole expansion. The left side is the picture before heat treatment, i.e., before size expansion, and the right side is the picture after heat treatment and after size expansion.

[0098] 11. The product after heat treatment is surface-treated at the laser processing part by means of mechanical polishing, chemical treatment, and electro-polishing, so as to make the product shiny.

[0099] The nickel-titanium alloy tube with holes or hollowed-out patterns prepared by the manufacturing method of the nickel-titanium alloy tube with holes or hollowed-out patterns provided in this application. For various products processed by laser using this method, the minimum thickness can reach 0.02 mm, and it can be processed according to the actual requirements of various products. This method reduces the processing difficulty of nickel-titanium alloy products with holes or hollowed-out patterns, improves the processing efficiency, and improves the dimensional accuracy of nickel-titanium alloy products.

[0100] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as the combinations of these technical features do not conflict, they should all be considered as the scope described in this specification. The above-described embodiments only express several embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A manufacturing method of a medical metal pipe with holes or hollow-out patterns, characterized in that, It includes the following steps: Provide a nickel-titanium alloy metal rod; Drill the nickel-titanium alloy metal rod to form a hollow nickel-titanium alloy outer shell; wherein, the outer diameter of the nickel-titanium alloy outer shell is 3 - 40 mm; Insert a metal wire into the nickel-titanium alloy outer shell to form a composite blank, wherein the outer diameter of the metal wire is 0.01 mm - 3 mm smaller than the inner diameter of the nickel-titanium alloy outer shell; wherein, the material of the metal wire is stainless steel, nickel-titanium alloy, high-speed steel or cobalt-chromium alloy; in the composite blank, the lengths of the nickel-titanium alloy outer shell tube and the metal wire are equal; Perform cold drawing forming treatment on the composite blank to form a composite metal rod; wherein, after cold drawing forming, the nickel-titanium alloy outer shell and the metal wire are tightly combined together; in the cold drawing forming, the cold drawing deformation amount is 30% - 40%; in the metal rod formed after cold drawing forming, the wall thickness of the nickel-titanium alloy outer shell on the outer layer after cold drawing forming treatment is 0.02 mm - 5 mm; Perform hole-opening treatment on the nickel-titanium alloy outer shell on the outer layer of the composite metal rod to form a preset hole structure or a preset hollow pattern; wherein, after cold drawing forming and before hole-opening treatment, the manufacturing method further includes: performing straightening treatment and surface brightening treatment on the composite metal rod in sequence, wherein the straightening temperature is 400 - 700 °C; the surface brightening treatment method is at least one of grinding, mechanical polishing, chemical treatment and electro-polishing; after the hole-opening treatment, the manufacturing method further includes: removing the residues after hole-opening treatment and reducing the surface roughness of the composite metal rod by using sandblasting, mechanical polishing, chemical treatment or electro-polishing; the hole-opening treatment is laser hole-opening treatment; in the hole-opening treatment, the two ends of the composite metal rod are not subjected to hole-opening treatment, and the lengths of the two ends not subjected to hole-opening treatment are both 0.3 - 10 cm, and after the hole-opening treatment, the manufacturing method further includes: cutting off and removing the two ends not subjected to hole-opening treatment; Take out the metal wire from the composite metal rod to form the medical metal tube with holes or hollow patterns, and the medical metal tube with holes or hollow patterns is used for a porous filter or an adsorbent support.

2. The manufacturing method according to claim 1, characterized in that, The length of the formed composite metal rod is suitable for manufacturing multiple medical metal tubes with holes or hollow patterns. After the cold drawing forming and before any one of the straightening treatment, the surface brightening treatment and the hole-opening treatment, the manufacturing method further includes: performing a cutting-off treatment on the composite metal rod to form multiple cut-off composite metal rods, and each cut-off composite metal rod is suitable for manufacturing a single medical metal tube with holes or hollow patterns.

3. A medical metal pipe with holes or hollowed-out patterns, characterized in that, Prepared by using the manufacturing method as described in claim 1 or 2.

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