Thrombus removing device, tool bit and preparation method of tool bit

Abstract

The invention discloses a thrombus removing device, a tool bit and a preparation method of the tool bit, and relates to the technical field of medical instruments. The tool bit comprises a tool bit base body, a wear-resistant coating and an anti-adhesion coating. The tool bit base body is provided with a contact part making contact with a target cutting object and an easy-to-adhere part where fragments generated by cutting flow through. The wear-resistant coating is coated on the contact part of the tool bit base body to form a wear-resistant area; the anti-adhesion coating is coated on the easy-adhesion part of the tool bit base body so as to form an anti-adhesion area. The structure of the scalpel head is improved, the scalpel head is subjected to function division, the wear-resistant coating is arranged on the wear-resistant area, and the anti-adhesion coating is arranged on the anti-adhesion area, so that the scalpel head has the super-hard wear-resistant characteristic and excellent anti-thrombus adhesion, the overall service life of the scalpel head is prolonged, the operation efficiency is improved, and the operation safety is improved; and serious complications such as far-end embolism caused by falling of thrombus fragments can be effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a thrombus removal device, a cutting head, and a method for preparing the same. Background Technology

[0002] Thrombotic diseases are one of the leading causes of disability and death worldwide. With the development of interventional medicine, mechanical thrombectomy devices have become an important tool for treating intravascular thrombosis. These devices use a high-speed rotating blade to cut and remove the thrombus, and their performance directly affects the success of the procedure and patient safety.

[0003] However, the existing thrombectomy devices still face two major technical bottlenecks in clinical applications: First, the blades are prone to wear during high-speed rotational cutting, especially when dealing with hard thrombi. Dullness of the blade can affect cutting efficiency and may cause the device to jam. Second, thrombus fragments after cutting are prone to re-adhere to the blade surface, which not only reduces surgical efficiency but may also cause serious complications such as distal embolism caused by the shedding of thrombus fragments.

[0004] Currently, to enhance the hardness and wear resistance of the cutting tip, a coating is typically applied, usually using materials with high wear resistance and high hardness. Existing thrombectomy devices use cemented carbide cutting tips with a certain thickness of refractory hard compounds such as nitrides, carbides, and oxides coated on the carbide surface, resulting in a coating with high hardness and wear resistance. However, this type of cutting tip has poor anti-thrombus adhesion properties, and thrombus fragments easily re-adhere to the cutting tip surface after cutting. Summary of the Invention

[0005] The main objective of this invention is to provide a thrombus removal device, a blade, and a method for preparing the same, which aims to make the blade both wear-resistant and thrombus-resistant, thereby improving the overall service life of the blade and the efficiency and safety of the surgery, and avoiding serious complications such as distal embolism caused by thrombus fragments falling off.

[0006] To achieve the above objectives, the present invention provides a cutting head, comprising: The cutter head base has a contact area that contacts the target material being cut and an area through which the cutting debris easily adheres; A wear-resistant coating is applied to the contact area of ​​the cutter head substrate to form a wear-resistant zone; and An anti-adhesion coating is applied to the easily adhesive areas of the cutter head substrate to form an anti-adhesion zone.

[0007] Optionally, the surface of the cutter head substrate is provided with a bonding layer, the material of which is (Ti, Al, Cr, Co)N, or a mixture of (Ti, Al, Cr, Co)N and Al2O3; and / or The thickness of the bonding layer is 0.5-1 μm.

[0008] Optionally, the wear-resistant coating is applied to the bonding layer, and the wear-resistant coating is a composite material of TiAlN and DLC, wherein the mass percentage of TiAlN and DLC in the wear-resistant coating is 85%-98%:2%-10%; and / or The thickness of the wear-resistant coating is 3-5 μm.

[0009] Optionally, the anti-adhesion coating comprises a DLC transition layer and a PEEK-heparin active coating coated on the bonding transition layer, wherein the mass percentages of heparin, PEEK, and DLC in the anti-adhesion coating are 30%-45%: 40%-60%: 5%-15%; and / or The thickness of the anti-adhesion coating is 2-3 μm.

[0010] Optionally, the wear-resistant area and the anti-adhesion area are connected by a transition area, which is formed by a gradient coating applied to the cutter head substrate. The gradient coating includes a plurality of transition layers arranged sequentially from bottom to top, and the hardness of the plurality of transition layers gradually decreases.

[0011] Optionally, the plurality of transition layers are respectively a first transition layer, a second transition layer and a third transition layer, wherein the materials of the first transition layer are all TiAlN, DLC and heparin, and the materials of the second transition layer and the third transition layer are all TiAlN, DLC, heparin and PEEK.

[0012] Optionally, the mass percentages of TiAlN, DLC, and heparin in the first transition layer are 75%-85%:10%-20%:1%-10%, and the thickness of the first transition layer is 0.5-1 μm; and / or The mass percentages of TiAlN, DLC, heparin, and PEEK in the second transition layer are 30%-45%: 30%-45%: 10%-20%: 1%-10%, and the thickness of the second transition layer is 0.5-1 μm; and / or The mass percentages of TiAlN, DLC, heparin, and PEEK in the third transition layer are 5%-15%: 25%-40%: 25%-40%: 25%-40%, and the thickness of the third transition layer is 0.5-1 μm.

[0013] Optionally, the cutter head has a cutter head body section and a cutter tip section connected to the cutter head body section; The surface of the blade tip is divided into a front cutting edge, a front first side, a front second side, a front third side, and a front fourth side. One side of the front cutting edge is connected to the front third side through the front first side, and the other side of the front cutting edge is connected to the front fourth side through the front second side. The surface of the main body of the blade head is divided into a rear cutting edge, a rear first side, a rear second side, a rear third side, and a rear fourth side. One side of the rear cutting edge is connected to the rear third side through the rear first side, and the other side of the rear cutting edge is connected to the rear fourth side through the rear second side.

[0014] Optionally, the wear-resistant area includes the wear-resistant area of ​​the front cutting edge, the wear-resistant area of ​​the front first side, and the wear-resistant area of ​​the front second side, respectively located on the entire front cutting edge, part of the front first side, and part of the front second side of the blade tip segment; The transition zone includes a front first side transition zone and a front second side transition zone located on a portion of the front first side and a portion of the front second side of the blade tip segment, respectively. The anti-adhesion zone includes anti-adhesion zones on a portion of the first front side, a portion of the third front side, a portion of the second front side, and a portion of the fourth front side of the blade tip segment; and / or The wear-resistant area also includes the wear-resistant area of ​​the rear cutting edge, the wear-resistant area of ​​the rear first side, and the wear-resistant area of ​​the rear second side, respectively located on the entire rear cutting edge, part of the rear first side, and part of the rear second side of the main body section of the blade head; The transition zone also includes a rear first side transition zone and a rear second side transition zone located on a portion of the rear first side and a portion of the rear second side of the cutter head body section, respectively. The anti-adhesion area also includes a rear first side anti-adhesion area, a rear third side anti-adhesion area, a rear second side anti-adhesion area, and a rear fourth side anti-adhesion area located on a portion of the rear first side, a portion of the rear third side, a portion of the rear second side, and a portion of the rear fourth side of the cutter head body section, respectively.

[0015] To achieve the above objectives, the present invention provides a method for manufacturing a cutting tip, which is used to manufacture the cutting tip as described above. The manufacturing method includes the following steps: Pre-treat the cutter head substrate; A bonding layer is deposited on the cutter head substrate; A wear-resistant coating is deposited on the bonding layer at the contact area of ​​the cutter head substrate to form a wear-resistant zone; A gradient coating is deposited on the transition zone between the contact area and the easily adhered area to form a transition zone; An anti-adhesion coating is deposited on the bonding layer at the easily adhesive portion of the cutter head substrate to form an anti-adhesion zone.

[0016] To achieve the above objectives, the present invention also provides a thrombus removal device, comprising a catheter and a blade as described above disposed within the catheter, the blade comprising: The cutter head base has a contact area that contacts the target material being cut and an area through which the cutting debris easily adheres; A wear-resistant coating is applied to the contact area of ​​the cutter head substrate to form a wear-resistant zone; and An anti-adhesion coating is applied to the easily adhesive areas of the cutter head substrate to form an anti-adhesion zone.

[0017] In the technical solution of this invention, the cutting head includes a cutting head substrate, a wear-resistant coating, and an anti-adhesion coating. The cutting head substrate has a contact area that contacts the target cutting material and an adhesion area through which cutting debris flows. The wear-resistant coating is applied to the contact area of ​​the cutting head substrate to form a wear-resistant zone. The anti-adhesion coating is applied to the adhesion area of ​​the cutting head substrate to form an anti-adhesion zone. It can be understood that this invention improves the structure of the cutting head by functionally dividing it into zones, setting a wear-resistant coating on the wear-resistant zone, and setting an anti-adhesion coating on the anti-adhesion zone. This gives the cutting head both ultra-hard wear resistance and excellent anti-thrombotic adhesion, thereby improving the overall service life of the cutting head and the efficiency and safety of the surgery. It can effectively prevent serious complications such as distal embolism caused by thrombus debris detachment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the blade of the present invention; Figure 2 This is a schematic diagram of the wear-resistant coating in the wear-resistant area of ​​one embodiment of the cutter head of the present invention; Figure 3 This is a schematic diagram of the anti-adhesion coating in the anti-adhesion area of ​​one embodiment of the cutter head of the present invention; Figure 4 This is a schematic diagram of the gradient coating structure in the transition zone of one embodiment of the cutting head of the present invention; Figure 5 This is a cross-sectional view of the tip section in one embodiment of the blade head of the present invention; Figure 6This is a cross-sectional view of the main body segment of the cutter head in one embodiment of the present invention; Figure 7 This is a schematic flowchart of an embodiment of the method for preparing the blade of the present invention.

[0020] Explanation of reference numerals in the attached figures: 10. Blade body; 20. Wear-resistant coating; 30. Anti-adhesion coating; 40. Gradient coating; 101. Bonding layer; 301. DLC transition layer; 302. PEEK-heparin active coating; 411. First transition layer; 412. Second transition layer; 413. Third transition layer; 11. Front cutting edge; 21. Front first side; 31. Front second side; 41. Front third side; 51. Front fourth side; 12. Rear cutting edge; 22. Rear first side; 32. Rear second side; 42. Rear third side; 52. Rear fourth side; 111. Front blade 112. First front side wear-resistant zone; 113. Second front side wear-resistant zone; 211. First front side transition zone; 212. Second front side transition zone; 311. First front side anti-adhesion zone; 313. Third front side anti-adhesion zone; 121. Rear blade wear-resistant zone; 122. Rear first side wear-resistant zone; 123. Rear second side wear-resistant zone; 221. Rear first side transition zone; 222. Rear second side transition zone; 321. Rear first side anti-adhesion zone; 322. Rear second side anti-adhesion zone; 323. Rear third side anti-adhesion zone.

[0021] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0024] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. The word "and / or" throughout the text means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. The technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0026] This invention proposes a cutting head suitable for cutting hard thrombi or calcified plaques, etc., and is not limited to these.

[0027] Reference Figures 1 to 4 In one embodiment of the present invention, the cutting head includes a cutting head substrate 10, a wear-resistant coating 20, and an anti-adhesion coating 30; the cutting head substrate 10 has a contact portion that contacts the target cutting object such as thrombus or calcified plaque and an easily adhered portion through which the cutting debris flows; the wear-resistant coating 20 is applied to the contact portion of the cutting head substrate 10 to form a wear-resistant area; the anti-adhesion coating 30 is applied to the easily adhered portion of the cutting head substrate 10 to form an anti-adhesion area.

[0028] In this embodiment, a bonding layer 101 may be provided on the surface of the cutter head substrate 10, using a metal nitride (Ti, Al, Cr, Co)N or a mixture of (Ti, Al, Cr, Co)N and Al2O3 as the bottom layer to enhance the adhesion between the subsequent coating and the cutter head substrate 10. The thickness of the bonding layer 101 may be 0.5-1μm.

[0029] In this embodiment, the cutter head includes a main body section and a tip section (a pointed, conical portion) connected to the main body section. (Main reference...) Figure 1 , Figure 5 and Figure 6The contact areas may include the entire front cutting edge 11, a portion of the front first side 21, and a portion of the front second side 31 of the tip section, and the entire rear cutting edge 12, a portion of the rear first side 22, and a portion of the rear second side 32 of the main body section of the cutter head. These areas may be coated with a wear-resistant coating 20. Areas prone to adhesion may include a portion of the front first side 21, a portion of the front third side 41, a portion of the front second side 31, and a portion of the front fourth side 51 of the tip section, and a portion of the rear first side 22, a portion of the rear third side 42, a portion of the rear second side 32, and a portion of the rear fourth side 52 of the main body section of the cutter head. These areas may be coated with an anti-adhesion coating 30.

[0030] The wear-resistant coating 20 may be a coating of several metals or a composite of several metals and other materials that can improve the wear resistance of the cutting head; there are no restrictions here.

[0031] The anti-adhesion coating 30 may be a number of coatings that can prevent thrombus fragments from adhering to the blade tip. It may be an anticoagulant material that prevents thrombus formation or a composite material made of anticoagulant material and other materials. No limitation is made here.

[0032] The thrombus removal device of this invention employs a patterned coating scheme for its blade head. By functionally dividing the blade head and applying different types of coatings accordingly, a precise match between wear resistance and anti-thrombus adhesion is achieved. Based on the three-dimensional structure and working principle of the blade head, this invention divides the device into two basic functional areas: the first is the wear-resistant area, which is the part of the blade head that directly contacts the hard thrombus and generates a cutting action, including the tip of the blade and the side stress area. This area is prone to wear due to high-frequency friction. The second is the anti-adhesion area, which is the part of the thrombus fragments that flow through after cutting and is prone to adhesion, including the root of the blade, the gap between the blades, and the non-cutting stress surface. This area has no direct cutting load, but it is necessary to guide the thrombus fragments to flow smoothly into the suction channel.

[0033] It is understood that the present invention improves the structure of the blade head by dividing the blade head into functional zones, setting a wear-resistant coating 20 on the wear-resistant zone and an anti-adhesion coating 30 on the anti-adhesion zone, so that the blade head has both ultra-hard wear-resistant properties and excellent anti-thrombotic adhesion, thereby improving the overall service life of the blade head and the efficiency and safety of the operation, and effectively avoiding serious complications such as distal embolism caused by the shedding of thrombus fragments.

[0034] In one embodiment, reference is made to Figure 2A wear-resistant coating 20 is applied to the bonding layer 101. The wear-resistant coating 20 is a composite material of titanium aluminum nitride (TiAlN) and diamond-like carbon (DLC). The mass percentage of TiAlN to DLC in the wear-resistant coating 20 is 85%-98%:2%-10%, preferably 95%:5%. The thickness of the wear-resistant coating 20 is preferably 3-5 μm. This gives the cutting head excellent wear resistance, making it less prone to wear, dulling, and jamming during high-speed rotary cutting of hard thrombi, further improving cutting efficiency.

[0035] In one embodiment, reference is made to Figure 3 The anti-adhesion coating 30 may include a DLC transition layer 301 and a PEEK-heparin active coating 302 sequentially coated on the bonding layer 101. The mass percentage of heparin, PEEK, and DLC in the anti-adhesion coating 30 is 30%-45%:40%-60%:5%-15%, preferably 40%:60%:10%, and the thickness of the anti-adhesion coating 30 is preferably 2-3 μm. By using this anti-adhesion coating 30 and placing it in the area through which thrombus fragments flow, the overall strength and wear resistance of the cutting head can be enhanced, while significantly improving the anti-thrombotic adhesion of the cutting head. This makes it difficult for thrombus fragments to re-adhere to the cutting head surface after cutting, thus avoiding serious complications such as distal embolism caused by thrombus fragment detachment. This invention satisfies the dual requirements of wear resistance and anti-thrombotic adhesion of the thrombus rotary cutting device by setting different surface characteristics in different functional parts of the cutting head.

[0036] In one embodiment, reference is made to Figure 1 and Figure 4 The wear-resistant zone and the anti-adhesion zone are connected by a transition zone, which is formed by a gradient coating 40 applied to the cutter head substrate 10. The gradient coating 40 includes several transition layers arranged sequentially from bottom to top, with the hardness of the transition layers gradually decreasing. This arrangement makes the connection between the wear-resistant coating 20 and the anti-adhesion coating 30 on the cutter head substrate 10 more reliable and stable, preventing breakage in the transition zone during cutting.

[0037] In this embodiment, to ensure the reliability of the connection between the wear-resistant coating 20 and the anti-adhesion coating 30, and to ensure that the transition area has both wear resistance and anti-thrombotic adhesion properties, the following is mainly referred to Figure 4 The transition layers can be a first transition layer 411, a second transition layer 412, and a third transition layer 413. The materials of the first transition layer 411 are TiAlN, DLC, and heparin, while the materials of the second transition layer 412 and the third transition layer 413 are TiAlN, DLC, heparin, and PEEK. Of course, more gradient coatings can be set, and other materials can also be used for the coatings; there are no restrictions here.

[0038] Preferably, the mass percentages of TiAlN, DLC, and heparin in the first transition layer 411 are 75%-85%:10%-20%:1%-10%, more preferably 80%:15%:5%, and the thickness of the first transition layer 411 is preferably 0.5-1 μm. The mass percentages of TiAlN, DLC, heparin, and PEEK in the second transition layer 412 are 30%-45%:30%-45%:10%-20%:1%-10%, more preferably 40%:40%:15%:5%, and the thickness of the second transition layer 412 is preferably 0.5-1 μm. The mass percentages of TiAlN, DLC, heparin, and PEEK in the third transition layer 413 are 5%-15%: 25%-40%: 25%-40%: 25%-40%, preferably 10%: 30%: 30%: 30%, and the thickness of the third transition layer 413 is preferably 0.5-1 μm.

[0039] The gradient coating 40 composition gradually transitions from high-hardness DLC or TiAlN to low-hardness heparin or PEEK polymer. The width of the transition region is preferably 0.1-0.5 mm, and the thickness of each layer is preferably 0.5-1 μm. This can effectively avoid interfacial stress caused by abrupt changes in coating performance.

[0040] In one embodiment, reference is made to Figure 1 , Figure 5 and Figure 6 The surface of the blade tip is divided into a front cutting edge 11, a front first side 21, a front second side 31, a front third side 41, and a front fourth side 51. One side of the front cutting edge 11 is connected to the front third side 41 via the front first side 21, and the other side of the front cutting edge 11 is connected to the front fourth side 51 via the front second side 31. The surface of the blade body is divided into a rear cutting edge 12, a rear first side 22, a rear second side 32, a rear third side 42, and a rear fourth side 52. One side of the rear cutting edge 12 is connected to the rear third side 42 via the rear first side 22, and the other side of the rear cutting edge 12 is connected to the rear fourth side 52 via the rear second side 32.

[0041] For the tip section, refer to... Figure 1 and Figure 5The wear-resistant zone may include wear-resistant zones 111, 112, and 113 on the entire front cutting edge 11, a portion of the front first side 21, and a portion of the front second side 31 of the blade tip section, respectively. The transition zone includes front first side transition zones 211 and 212 on a portion of the front first side 21 and a portion of the front second side 31 of the blade tip section, respectively. The anti-adhesion zone includes front first side anti-adhesion zones 311, 313, and 51 on a portion of the front first side 21, a portion of the front third side 41, a portion of the front second side 31, and a portion of the front fourth side 51 of the blade tip section, respectively. Figure 1 (Center is blocked), front fourth side anti-adhesion area ( Figure 1 (The middle is obscured). The anti-adhesion zones and transition zones on both sides of the blade tip are symmetrically arranged about the center line of the blade tip. In this embodiment, each transition zone can be arranged in an arc shape, with the center located on the side opposite to the front blade face 11.

[0042] For the main body of the cutter head, refer to Figure 1 and Figure 6 The wear-resistant zone includes wear-resistant zones 121, 122, and 123 on the entire rear cutting edge 12, a portion of the rear first side 22, and a portion of the rear second side 32 of the main body section of the cutter head. The transition zone includes a rear first side transition zone 221 and a rear second side transition zone 222 on a portion of the rear first side 22 and a portion of the rear second side 32 of the main body section of the cutter head. The anti-adhesion zone includes a rear first side anti-adhesion zone 321, a rear third side anti-adhesion zone 323, a rear second side anti-adhesion zone 322, and a rear fourth side anti-adhesion zone 52 on a portion of the rear first side 22, a portion of the rear third side 42, a portion of the rear second side 32, and a portion of the rear fourth side 52 of the main body section of the cutter head. Figure 1 (The middle is obscured). The anti-adhesion zones and transition zones on both sides of the main body of the cutter head are symmetrically arranged about the center line of the main body of the cutter head. In this embodiment, each transition zone can be arranged in an arc shape, with the center located on the side opposite to the rear cutting edge 12.

[0043] It is understood that by adopting the above-mentioned refined functional area division, the present invention provides wear-resistant coating 20 to all parts that may come into contact with thrombi as much as possible, provides anti-adhesion coating 30 to all areas through which the cutting fragments may flow, and provides a gradient coating 40 for transition between the wear-resistant area and the anti-adhesion area, so that the blade has different surface characteristics in different functional areas, thus meeting the dual requirements of wear resistance and anti-thrombus adhesion of the thrombus rotary cutting device.

[0044] This invention proposes a thrombus removal device, including a catheter and a blade disposed within the catheter. The specific structure of the blade is as described in the above embodiments. Since the thrombus removal device proposed in this invention includes all solutions of all embodiments of the blade described above, it has at least the same technical effects as the blade described above, and will not be elaborated here.

[0045] This invention also proposes a method for preparing a cutting tip, used to manufacture the aforementioned cutting tip. The following detailed description of the cutting tip preparation method of this invention is provided through specific embodiments. The embodiments described below are exemplary and are only used to explain this invention, and should not be construed as limiting the invention. Where specific techniques, conditions, or test methods are not specified in the embodiments, they shall be performed according to the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0046] Reference Figures 1 to 7 The preparation method includes the following steps: S10, Pre-treated cutter head substrate 10; S20. Deposit a bonding layer 101 on the cutter head substrate 10; S30. A wear-resistant coating 20 is deposited on the bonding layer 101 at the contact area of ​​the cutter head substrate 10 to form a wear-resistant zone; S40. Deposit a gradient coating 40 on the transition zone between the contact area and the easily adhered area to form a transition zone; S50. An anti-adhesion coating 30 is deposited on the bonding layer 101 at the easily adhesive part of the cutter head substrate 10 to form an anti-adhesion zone.

[0047] This embodiment employs magnetron sputtering technology to coat a composite patterned coating. During the preparation phase, the following target materials need to be prepared in advance: Ti target, TiAl alloy target (Ti:Al=4:1), graphite target (for DLC), PEEK-heparin composite target (PEEK:heparin=5:4), and heparin target (180 IU / mg). The purity of all the above target materials should reach 99.9%.

[0048] In step S10 above, during the pretreatment of the cutting head substrate, the cutting head can be first polished to remove surface impurities and oxide layers, and then the substrate surface can be activated by plasma cleaning to improve the coating adhesion.

[0049] Specifically, the surface of the cutting tool substrate is polished sequentially with 1000#, 2000#, and 5000# diamond grinding wheels to remove oxide scale and machining defects; the cutting tool is then ultrasonically cleaned with acetone, anhydrous ethanol, and ultrapure water for 10 minutes, and then dried with nitrogen; the cutting tool substrate is placed in the vacuum chamber of a coating machine, argon gas is introduced, power is 150W, bias voltage is -200V, temperature is 100℃, and etching is performed for 10 minutes to activate the surface activity of the substrate.

[0050] In step S20 above, when depositing the bonding layer 101, a TiN target is used to form a dense nanocrystalline structure on the surface of the cutting head by mid-frequency magnetron sputtering deposition.

[0051] Specifically, the Ti target was sputtered at a medium frequency with a power of 2kW. Nitrogen (20 sccm) and argon (10 sccm) were introduced. The substrate temperature was set to 200℃, the substrate bias voltage was -100V, and the deposition time was 45min.

[0052] In step S30 above, a mask can first be applied to the functional area, using laser etching or precision film application to protect the uncoated areas, exposing only the target functional area. Then, during the coating deposition in the wear-resistant area, a TiAlN and DLC composite target is used, and an ultrahard coating is deposited in the wear-resistant area using mid-frequency magnetron sputtering deposition technology.

[0053] Specifically, a custom-made stainless steel mask is used, according to... Figure 1 The non-cutting area (i.e., non-transition area) is shielded to expose the cutting edge; medium-frequency magnetron sputtering is started on the TiAl target (1.9kW) and graphite target (0.1kW), and argon (25sccm) and nitrogen (5sccm) are introduced, the temperature is 200℃, the bias voltage is -120V, and the deposition time is 75min.

[0054] In step S40 above, during the deposition of the transition zone coating, the target power ratios of TiAlN, DLC, heparin, and PEEK are adjusted in real time to perform multi-target synergistic sputtering, and the bottom layer, middle layer, and top layer of the transition zone are deposited sequentially.

[0055] Specifically, according to Figure 1 As shown, the shielded wear-resistant zone and anti-adhesion zone, and the exposed transition zone, employ "multi-target synergistic sputtering." By adjusting the power ratios of the TiAl target, graphite target, heparin target, and PEEK-heparin composite target, a component gradient change is achieved. The bottom layer of the transition zone (first transition layer 411): The TiAl target (1.6kW), graphite target (0.3kW), and heparin target (0.1kW) are started for mid-frequency magnetron sputtering, and argon (25sccm) and nitrogen (5sccm) are introduced. The temperature is 150℃, the bias voltage is -80V, and the deposition time is 18min. Intermediate layer of the transition zone (second transition layer 412): Initiate mid-frequency magnetron sputtering using TiAl target (0.8kW), graphite target (0.8kW), heparin target (0.3kW), and PEEK-heparin composite target (0.1kW), with argon (25sccm) and nitrogen (5sccm) introduced, at a temperature of 120℃, a bias voltage of -60V, and a deposition time of 18min; Top layer of the transition zone (third transition layer 413): Initiate mid-frequency magnetron sputtering using TiAl target (0.2kW), graphite target (0.6kW), heparin target (0.6kW), and PEEK-heparin composite target (0.6kW), with argon (25sccm) and nitrogen (5sccm) introduced, at a temperature of 100℃, a bias voltage of -40V, and a deposition time of 18min.

[0056] In step S50 above, when depositing the coating in the anti-adhesion area, after replacing the mask or removing the original mask, heparin, PEEK, and DLC multi-target materials are used to deposit an anti-thrombotic adhesion coating in the anti-adhesion area using radio frequency magnetron sputtering technology.

[0057] Specifically, replace the photomask, according to... Figure 1 The shielding area and transition area are shown, while the anti-adhesion area is exposed. A two-step deposition process is employed, consisting of a DLC transition layer 301 and a PEEK-heparin active layer. DLC transition layer 301: Start the graphite target (200W) for medium frequency magnetron sputtering, introduce argon gas at 30 sccm, temperature at 75℃, bias at -30V, and deposition time at 15 min; PEEK-Heparin Active Coating 302: Radio frequency magnetron sputtering was performed using two PEEK-heparin composite targets (total power 1800W), with a PEEK:heparin ratio of 5:4. Argon gas was introduced at 30 sccm and hydrogen gas at 2 sccm, the temperature was 68℃, and the bias voltage was -25V. Deposition was performed in three intermittent cycles, each lasting 25 minutes with a 5-minute interval.

[0058] In embodiments of the present invention, the materials, dosage ranges, and thicknesses of the wear-resistant coating 20, the first transition layer 411, the second transition layer 412, the third transition layer 413, and the anti-adhesion coating 30 on the cutter head substrate 10 are specifically selectable as shown in Table 1 below: Table 1. Coating materials, dosage ranges, and thicknesses for the cutting head.

[0059] In actual production, by using the above preparation method, adjusting the material mass ratio and other parameters according to Table 1, and setting the equipment parameters appropriately, the corresponding cutter head product can be obtained.

[0060] To verify the effects of the wear-resistant coating 20, the anti-adhesion coating 30, and the gradient coating 40 on the anti-tip material, several sets of test examples and comparative examples will be presented below for explanation and demonstration.

[0061] First, verify the effect of the wear-resistant coating 20, see the following test examples one to three and comparative examples one to three.

[0062] Experimental Example 1 The wear resistance (service life and coefficient of friction) of the cutter head prepared by the preparation method of the aforementioned embodiment was measured.

[0063] Critical load test / friction coefficient test: The coating-substrate bonding strength was evaluated by scratch test using a standard Rockwell C-type diamond indenter. The indenter was slowly brought into contact with the corresponding area of ​​the sample to be tested, and a preload of 0.5N was applied to ensure contact between the indenter and the cutting head. A progressive loading mode was adopted with a loading rate of 10N / mm and a scratch length of 10mm. The critical load (Lc) at which local peeling of the coating occurred was recorded. At the same time, the coating friction coefficient was tested with a constant load.

[0064] In this test example, the cutter head adopted the following optimal values: bonding layer 101, wear-resistant coating 20 boundary value (TiAlN lower limit 85%, DLC upper limit 15%), gradient coating 40, and anti-adhesion coating 30. The specific values ​​and test results are shown in Table 2 below: Table 2. Test Example 1: Coating materials, dosage ranges, thicknesses, and test results for each type of cutter head.

[0065] Test results show that the cutter head life in this test example is 37.8 min, the friction coefficient is 0.12, and the wear-resistant coating 20 has a good wear resistance effect.

[0066] Experimental Example 2 The difference between this test example and the above-mentioned test example 1 is that the material mass percentage of the wear-resistant coating 20 is different. The cutter head adopts the optimal values ​​for bonding layer 101, wear-resistant layer boundary values ​​(TiAlN upper limit 98%, DLC lower limit 2%), gradient coating 40, and anti-adhesion coating 30. The specific values ​​and test results are shown in Table 3 below: Table 3. Test Example 2: Coating materials, dosage ranges, thicknesses, and test results for the cutting head.

[0067] Test results show that the cutter head life in this test example is 41.6 min, the friction coefficient is 0.26, and the wear-resistant coating 20 has a good wear resistance effect.

[0068] Experimental Example 3 The difference between this test example and the above-mentioned test example 1 is that the material mass percentage of the wear-resistant coating 20 is different. The cutter head uses the optimal values ​​for bonding layer 101, wear-resistant coating 20 (TiAlN is the median value of 95%, DLC is the median value of 5%), gradient coating 40, and anti-adhesion coating 30. The specific values ​​and test results are shown in Table 4 below: Table 4. Test Example 3: Coating materials, dosage ranges, thicknesses, and test results for the cutting head.

[0069] Test results show that the lifespan of the cutter head in this test example is 40.1 min, the coefficient of friction is 0.15, and the wear-resistant coating 20 has a good wear resistance effect.

[0070] Comparative Example 1 The difference between this comparative example and the above-mentioned test example 1 is that the material mass percentage of the wear-resistant coating 20 is different. The cutter head uses the optimal values ​​for bonding layer 101, extreme values ​​for the wear-resistant layer (TiAlN mass percentage is 100%, DLC mass percentage is 0%), the gradient coating 40, and the anti-adhesion coating 30. The specific values ​​and test results are shown in Table 5 below: Table 5 Comparative Example 1: Coating materials, dosage ranges, thicknesses, and test results for each type of cutter head.

[0071] Test results show that the blade life of this comparative example is 45.4 min and the friction coefficient is 0.43. That is, the blade life is relatively long, but the friction coefficient is too high and the cutting effect of the blade is poor.

[0072] It should be noted that a high coefficient of friction may cause the following problems: excessive stimulation of the blood vessel wall, causing intimal damage; increased risk of thrombus fragmentation; hindering smooth rotation of the blade, reducing resection efficiency; increasing pushing resistance and affecting control; potentially generating local heat and causing tissue thermal damage; and accelerating blade wear, reducing service life.

[0073] Comparative Example 2 The difference between this comparative example and the above-mentioned test example 1 is that the material mass percentage of the wear-resistant coating 20 is different. The cutter head uses the optimal values ​​for bonding layer 101, wear-resistant layer extreme values ​​(TiAlN mass percentage of 70%, DLC mass percentage of 30%), gradient coating 40, and anti-adhesion coating 30. The specific values ​​and test results are shown in Table 6 below: Table 6 Comparative Example 2: Coating materials, dosage ranges, thicknesses, and test results for each type of cutter head.

[0074] Test results show that the tool life of this comparative example is 33.4 min and the friction coefficient is 0.08, which means that the tool life is average and the cutting effect of the cutting edge is good.

[0075] Comparative Example 3 The difference between this comparative example and the above-mentioned test example 1 is that the cutting head of this comparative example does not have a wear-resistant coating 20. The coating on the cutting head includes a bonding layer 101, a gradient coating 40 (preferred value), and an anti-adhesion coating 30 (preferred value). The specific values ​​and test results are shown in Table 7 below: Table 7 Comparative Example 3: Coating materials, dosage ranges, thicknesses, and test results for each type of cutter head.

[0076] Test results show that the blade life of this comparative example is 21.5 min and the friction coefficient is 0.33, which means that the blade life is short and the cutting effect of the blade is poor.

[0077] The above test examples 1 to 3 and comparative examples 1 to 3 verify that applying a wear-resistant coating 20 to the cutting head can effectively improve the wear resistance of the cutting head.

[0078] To verify the effect of the anti-adhesion coating 30, several sets of test examples and comparative examples will be described below. See Test Examples 4 to 5 and Comparative Examples 4 to 7 below.

[0079] Experimental Example 4 The anti-adhesion properties of the blade tip prepared by the preparation method of the aforementioned embodiment were measured.

[0080] Test methods Critical load test: The coating-substrate bonding strength was evaluated by scratch test using a standard Rockwell C-type diamond indenter. The indenter was slowly brought into contact with the corresponding area of ​​the sample to be tested, and a preload of 0.5N was applied to ensure contact between the indenter and the cutting head. A progressive loading mode was adopted with a loading rate of 10N / mm and a scratch length of 10mm. The critical load (Lc) at which the coating showed local peeling was recorded. At the same time, the coefficient of friction of the coating was tested under constant load.

[0081] Anti-adhesion test: An extracorporeal blood circulation device was constructed using a simulated vascular system and a flow pump. Blade tips with or without anti-adhesion coatings were delivered into the vascular system. A certain amount of anticoagulated rabbit whole blood was injected into the device, and circulation began. After 30 minutes, extracorporeal circulation was terminated. The blade tips were removed, gently rinsed with physiological saline, and any residual thrombi on the blade tips were collected and weighed.

[0082] In this test example, the preferred values ​​for the cutting head were bonding layer 101, wear-resistant coating 20, gradient coating 40, and anti-adhesion coating 30 (DLC mass percentage 10%, heparin mass percentage 40%, PEEK mass percentage 50%). Specific values ​​and test results are shown in Table 8 below. Table 8. Test Example 4: Coating materials, dosage ranges, thicknesses, and test results for the cutting head.

[0083] Test results show that the critical load of the blade in this experiment is 48.69 N, the weight of the thrombus is 0.17 g, the coating of the blade has strong adhesion and a certain degree of anti-adhesion.

[0084] Experimental Example 5 The difference between this test example and Test Example 4 above is that the cutter head in this test example uses the following boundary values: bonding layer 101, wear-resistant coating 20 (preferred value), gradient coating 40 (preferred value), and anti-adhesion coating 30 (DLC mass percentage 15%, heparin mass percentage 45%, PEEK mass percentage 40%). The specific values ​​and test results are shown in Table 9 below: Table 9. Test Example 5: Coating materials, dosage ranges, thicknesses, and test results for each type of cutter head.

[0085] Test results show that the critical load of the blade in this experiment is 45.32 N, the weight of the thrombus is 0.09 g, the coating of the blade has good adhesion and good anti-adhesion properties.

[0086] Comparative Example 4 The difference between this comparative example and the above-mentioned test example four is that the cutter head in this test example uses the optimal values ​​of bonding layer 101, wear-resistant coating 20, gradient coating 40, and anti-adhesion coating 30 (DLC mass percentage of 0%, heparin mass percentage of 45%, and PEEK mass percentage of 55%). The specific values ​​and test results are shown in Table 10 below: Table 10 Comparative Example 4: Coating materials, dosage ranges, thicknesses, and test results for each type of cutter head.

[0087] Test results show that the critical load of the blade in this comparative example is 36.45N, the weight of the thrombus is 0.15g, the coating adhesion of the blade is average, and it has a certain degree of anti-adhesion.

[0088] Comparative Example 5 The difference between this comparative example and the above-mentioned test example four is that the cutter head in this test example uses the optimal values ​​of bonding layer 101, wear-resistant coating 20, gradient coating 40, and anti-adhesion coating 30 (DLC mass percentage of 40%, heparin mass percentage of 25%, and PEEK mass percentage of 35%). The specific values ​​and test results are shown in Table 11 below: Table 11 Comparative Example 5: Coating materials, dosage ranges, thicknesses, and test results for each type of cutter head.

[0089] Test results show that the critical load of the blade in this comparative example is 51.33 N, the weight of the thrombus is 0.38 g, the coating of the blade has good adhesion, but poor anti-adhesion.

[0090] Comparative Example 6 The difference between this comparative example and the above-mentioned test example four is that the cutter head in this test example uses the optimal values ​​of bonding layer 101, wear-resistant coating 20, gradient coating 40, and anti-adhesion coating 30 (DLC mass percentage of 40%, heparin mass percentage of 50%, and PEEK mass percentage of 10%). The specific values ​​and test results are shown in Table 12 below: Table 12 Comparative Example 6: Coating materials, dosage ranges, thicknesses, and test results for each type of cutter head.

[0091] Test results show that the critical load of the blade in this comparative example is 24.38 N, the weight of the thrombus is 0.08 g, the coating adhesion of the blade is poor, and the anti-adhesion is good.

[0092] Comparative Example 7 The difference between this comparative example and the above-mentioned test example four is that the cutter head in this test example uses a bonding layer 101, a wear-resistant coating 20 (preferred value), a gradient coating 40 (preferred value), and no anti-adhesion coating 30 (DLC mass percentage 0%, heparin mass percentage 0%, PEEK mass percentage 0%). The specific values ​​and test results are shown in Table 13 below: Table 13 Comparative Example 7: Coating materials, dosage ranges, thicknesses, and test results for each type of cutter head.

[0093] Test results show that the critical load of the blade in this comparative example is 55.32N, the weight of the thrombus is 1.35g, the coating of the blade has good adhesion, but very poor anti-adhesion.

[0094] To verify the effect of gradient coating 40, several sets of experimental examples and comparative examples will be described below. See Experimental Examples 6 to 9 and Comparative Example 8 below.

[0095] Experimental Example 6 The adhesion of the gradient coating 40 of the cutter head prepared by the preparation method of the aforementioned embodiment was measured.

[0096] This test example uses the same testing method as Test Example 4 above. The cutter head in this test example uses a preferred value for bonding layer 101, wear-resistant coating 20, and gradient coating 40, but with different coating positions (in order: second transition layer 412, third transition layer 413, and first transition layer 411), and a preferred value for anti-adhesion coating 30. Specific values ​​and test results are shown in Table 14 below: Table 14. Test Example 6: Coating materials, dosage ranges, thicknesses, and test results for each type of cutter head.

[0097] Test results show that the critical load of the cutter head in this test example is 38.64N, and the coating adhesion of the cutter head is average.

[0098] Experimental Example 7 The difference between this test example and Test Example 6 above is that the cutter head in this test example uses a bonding layer 101, a wear-resistant coating 20 (preferred value), a gradient coating 40 (preferred value but with different coating positions, namely the third transition layer 413, the second transition layer 412, and the first transition layer 411 in sequence), and an anti-adhesion coating 30 (preferred value). The specific values ​​and test results are shown in Table 15 below: Table 15. Test Example 7: Coating materials, dosage ranges, thicknesses, and test results for each type of cutter head.

[0099] Test results show that the critical load of the cutter head in this test example is 37.56N, and the coating adhesion of the cutter head is average.

[0100] Experimental Example 8 The difference between this test example and Test Example 6 above is that the cutter head in this test example uses a bonding layer 101, a wear-resistant coating 20 (preferred value), a gradient coating 40 (preferred value but with different coating positions, namely the first transition layer 411, the third transition layer 413, and the second transition layer 412), and an anti-adhesion coating 30 (preferred value). The specific values ​​and test results are shown in Table 16 below: Table 16. Test Example 8: Coating materials, dosage ranges, thicknesses, and test results for each type of cutter head.

[0101] Test results show that the critical load of the cutter head in this test example is 43.99 N, and the coating adhesion of the cutter head is good.

[0102] It should be further noted that the hardness of the gradient coating 40 should be set to gradually decrease from the inside out to avoid abrupt changes in interface properties that could cause interfacial stress and affect coating durability. Therefore, the larger the step change at the coating interface, the worse the critical load. The three experimental examples above have smaller critical loads compared to the optimal value for the transition layer.

[0103] Experimental Example 9 The difference between this test example and Test Example 6 above is that the cutter head in this test example uses the preferred values ​​for bonding layer 101, wear-resistant coating 20, and anti-adhesion coating 30, and does not have a gradient coating 40. The specific values ​​and test results are shown in Table 17 below: Table 17. Test Example 9: Coating materials, dosage ranges, thicknesses, and test results for each type of cutter head.

[0104] Test results show that the critical load of the cutter head in this test example is 32.27 N, and the coating adhesion of the cutter head is poor.

[0105] To verify the effects of each coating on the lifespan and anti-thrombotic properties of the blade tip, a blank control group was also set up. For specific tests, please refer to Comparative Example 8 below.

[0106] Comparative Example 8 The difference between this comparative example and Test Example 6 above is that the cutting head in this example has no coating treatment. The specific values ​​and test results are shown in Table 18 below: Table 18 Comparative Example 8: Coating materials, dosage ranges, thicknesses, and test results for each type of cutter head.

[0107] Test results show that when the blade in this comparative example is uncoated, the critical load is 10.8N and the thrombus weight is 1.48g. The service life and coating adhesion of this blade are both very poor.

[0108] To verify the effect of different coating thicknesses on the characteristics of the cutting head, several sets of experimental examples and comparative examples will be described below, see Comparative Examples 9 to 11 below.

[0109] Comparative Example 9 The difference between this comparative example and the above-mentioned Test Example 3 is that the thickness of the wear-resistant coating 20 is different, being 10 μm. The anti-thrombotic adhesion of the blade tip was tested. The blade tip used the optimal values ​​for bonding layer 101, wear-resistant coating 20, gradient coating 40, and anti-adhesion coating 30. Specific values ​​and test results are shown in Table 19 below: Table 19 Comparative Example 9: Coating materials, dosage ranges, thicknesses, and test results for each type of cutter head.

[0110] Test results show that the critical load of the blade in this comparative example is 42.3N, the thrombus weight is 0.08g, the service life of the blade is very good, but the improvement is not significant (compared to test example 3), and the anti-thrombus adhesion is very good.

[0111] Comparative Example 10 The difference between this comparative example and the above-mentioned Experimental Example 3 is that the thickness of the gradient coating 40 is different. The thicknesses of the first transition layer 411, the second transition layer 412, and the third transition layer 413 are all 1.5 μm. The anti-thrombotic adhesion of the blade tip was tested. The blade tip used the optimal values ​​for bonding layer 101, wear-resistant coating 20, gradient coating 40, and anti-adhesion coating 30. The specific values ​​and test results are shown in Table 20 below: Table 20 Comparative Example 10: Coating materials, dosage ranges, thicknesses, and test results for each type of cutter head.

[0112] Test results show that the critical load of the blade in this comparative example is 44.4 N, the thrombus weight is 0.11 g, the blade has a good service life and good anti-thrombus adhesion, but the improvement is not significant (compared to Experimental Example 3).

[0113] Comparative Example 11 The difference between this comparative example and the above-mentioned Test Example 3 is that the thickness of the anti-adhesion coating 30 is different, being 10 μm, and the anti-thrombotic adhesion of the blade tip was tested. The blade tip used the optimal values ​​for bonding layer 101, wear-resistant coating 20, gradient coating 40, and anti-adhesion coating 30. Specific values ​​and test results are shown in Table 21 below: Table 21 Comparative Example 11: Coating materials, dosage ranges, thicknesses, and test results for each type of cutter head.

[0114] Test results show that the critical load of the blade in this comparative example is 47.1 N, the thrombus weight is 0.09 g, the blade has a good service life and good anti-thrombus adhesion, but the improvement of both characteristics is not significant (compared to Experimental Example 3).

[0115] Therefore, it can be seen that the blade tip of the present invention, by adopting the aforementioned blade tip preparation method, effectively improves the wear resistance and anti-thrombotic adhesion performance of the blade tip.

[0116] In summary, this invention proposes a functional zoning design concept, overcoming the performance limitations of a single coating and specifically addressing the core pain points in different areas of the blade tip, achieving synergistic optimization of wear resistance and anti-thrombus adhesion. This invention employs patterned coating technology, using precise masking and step-by-step deposition processes to achieve a stable combination of two coatings with different properties on the same blade tip, resulting in smooth coating boundary transitions and no significant stress concentration. Based on the blade tip shape, this invention designs the coating position and shape, guiding the smooth flow of thrombus fragments, significantly reducing the risk of adhesion and blockage, and improving surgical safety and efficiency.

[0117] This invention primarily targets the cutting tip for rotary cutting of hard thrombi, proposing a zoned composite coating and patterned treatment scheme. By applying coatings with different properties to different functional areas of the cutting tip, it achieves ultra-hard wear resistance in high-wear areas such as the cutting zone, while simultaneously exhibiting excellent anti-thrombotic properties in areas prone to thrombus adhesion. This prevents thrombus fragments from adhering to and accumulating on the cutting tip surface, effectively preventing tip blockage and the risk of secondary embolism, achieving a balance between wear resistance and anti-thrombotic properties, thereby improving the overall service life of the cutting tip and the safety of the surgery. This solution resolves the contradiction that existing single-coating methods for cutting tips cannot simultaneously satisfy both wear resistance and anti-thrombotic adhesion, achieving synergistic optimization of these two core performance characteristics.

[0118] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A cutting head, characterized in that, include: The cutter head base has a contact area that contacts the target material being cut and an area through which the cutting debris easily adheres; A wear-resistant coating is applied to the contact area of ​​the cutter head substrate to form a wear-resistant zone; and An anti-adhesion coating is applied to the easily adhesive areas of the cutter head substrate to form an anti-adhesion zone.

2. The cutting head as described in claim 1, characterized in that, The surface of the cutter head substrate is provided with a bonding layer, the material of which is (Ti, Al, Cr, Co)N, or a mixture of (Ti, Al, Cr, Co)N and Al2O3; and / or The thickness of the bonding layer is 0.5-1 μm.

3. The cutting head as described in claim 2, characterized in that, The wear-resistant coating is applied to the bonding layer. The wear-resistant coating is a composite material of TiAlN and DLC, wherein the mass percentage of TiAlN and DLC in the wear-resistant coating is 85%-98%: 2%-10%; and / or The thickness of the wear-resistant coating is 3-5 μm.

4. The cutting head as described in claim 2, characterized in that, The anti-adhesion coating comprises a DLC transition layer and a PEEK-heparin active coating sequentially coated on the bonding layer, wherein the mass percentages of heparin, PEEK, and DLC in the anti-adhesion coating are 30%-45%: 40%-60%: 5%-15%; and / or The thickness of the anti-adhesion coating is 2-3 μm.

5. The cutting head as described in claim 1, characterized in that, The wear-resistant zone and the anti-adhesion zone are connected by a transition zone, which is formed by a gradient coating applied to the cutter head substrate. The gradient coating includes several transition layers arranged sequentially from bottom to top, and the hardness of the several transition layers gradually decreases.

6. The cutting head as described in claim 5, characterized in that, The aforementioned transition layers are a first transition layer, a second transition layer, and a third transition layer. The materials of the first transition layer are TiAlN, DLC, and heparin, while the materials of the second and third transition layers are TiAlN, DLC, heparin, and PEEK.

7. The cutting head as described in claim 6, characterized in that, The mass percentages of TiAlN, DLC, and heparin in the first transition layer are 75%-85%: 10%-20%: 1%-10%, and the thickness of the first transition layer is 0.5-1 μm; and / or The mass percentages of TiAlN, DLC, heparin, and PEEK in the second transition layer are 30%-45%: 30%-45%: 10%-20%: 1%-10%, and the thickness of the second transition layer is 0.5-1 μm; and / or The mass percentages of TiAlN, DLC, heparin, and PEEK in the third transition layer are 5%-15%: 25%-40%: 25%-40%: 25%-40%, and the thickness of the third transition layer is 0.5-1 μm.

8. The cutting head as described in any one of claims 5-7, characterized in that, The cutter head has a cutter head body section and a cutter tip section connected to the cutter head body section; The surface of the blade tip is divided into a front cutting edge, a front first side, a front second side, a front third side, and a front fourth side. One side of the front cutting edge is connected to the front third side through the front first side, and the other side of the front cutting edge is connected to the front fourth side through the front second side. The surface of the main body of the blade head is divided into a rear cutting edge, a rear first side, a rear second side, a rear third side, and a rear fourth side. One side of the rear cutting edge is connected to the rear third side through the rear first side, and the other side of the rear cutting edge is connected to the rear fourth side through the rear second side.

9. The cutting head as described in claim 8, characterized in that, The wear-resistant area includes the wear-resistant area of ​​the front cutting edge, the wear-resistant area of ​​the front first side, and the wear-resistant area of ​​the front second side, respectively located on the entire front cutting edge, part of the front first side, and part of the front second side of the blade tip. The transition zone includes a front first side transition zone and a front second side transition zone located on a portion of the front first side and a portion of the front second side of the blade tip segment, respectively. The anti-adhesion zone includes anti-adhesion zones on a portion of the first front side, a portion of the third front side, a portion of the second front side, and a portion of the fourth front side of the blade tip segment; and / or The wear-resistant area also includes the wear-resistant area of ​​the rear cutting edge, the wear-resistant area of ​​the rear first side, and the wear-resistant area of ​​the rear second side, respectively located on the entire rear cutting edge, part of the rear first side, and part of the rear second side of the main body section of the blade head; The transition zone also includes a rear first side transition zone and a rear second side transition zone located on a portion of the rear first side and a portion of the rear second side of the cutter head body section, respectively. The anti-adhesion area also includes a rear first side anti-adhesion area, a rear third side anti-adhesion area, a rear second side anti-adhesion area, and a rear fourth side anti-adhesion area located on a portion of the rear first side, a portion of the rear third side, a portion of the rear second side, and a portion of the rear fourth side of the cutter head body section, respectively.

10. A method for manufacturing a cutting tip, used to manufacture a cutting tip as described in any one of claims 5-9, characterized in that, The preparation method includes the following steps: Pre-treat the cutter head substrate; A bonding layer is deposited on the cutter head substrate; A wear-resistant coating is deposited on the bonding layer at the contact area of ​​the cutter head substrate to form a wear-resistant zone; A gradient coating is deposited on the transition zone between the contact area and the easily adhered area to form a transition zone; An anti-adhesion coating is deposited on the bonding layer at the easily adhesive portion of the cutter head substrate to form an anti-adhesion zone.

11. A thrombus removal device, characterized in that, It includes a conduit and a cutting head as described in any one of claims 1-9 disposed within the conduit.

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