Protective structure and intermediate structure

Abstract

The utility model relates to the technical field of medical instruments, in particular to a protective structure and a middle structure, the protective structure comprises a body suitable for covering a preset position of a to-be-cut piece, and the body completely or partially blocks the to-be-cut piece when cutting energy reaches the preset position. Therefore, the to-be-cut piece below is prevented from being cut or the cutting degree of the to-be-cut piece below is reduced, and it is guaranteed that the to-be-cut piece is not cut off. The protective structure and the middle structure are low in guide pipe machining cost and high in machining efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a protective structure and an intermediate structure. Background Art

[0002] Under current surgical conditions, when encountering patients with tortuous vascular anatomy, catheters with an intermediate layer made of braided wire or spring-wound wire are often the preferred choice. These catheters with a wire-reinforced intermediate layer offer significantly improved flex resistance, pressure resistance, anti-ovality, and torque transmission performance compared to conventional catheters. However, they still have significant drawbacks, primarily the low overall strength of the catheter, which can easily break and deform within the blood vessel. This is especially true in the event of vascular spasm, which causes the inner wall of the vessel to cling to the outer wall of the catheter. Improper operation can easily cause the catheter to break within the vessel, resulting in serious medical accidents. To address these issues, a technique has been developed to use stainless steel tubes as the intermediate layer of the catheter. These tubes are laser-engraved with a cutting pattern tailored to the catheter's performance. However, the intermittent pattern of these catheters results in frequent laser starts and stops during cutting, resulting in low efficiency and, consequently, high costs. Utility Model Content

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defects of low catheter processing efficiency and high processing cost in the prior art, thereby providing a protective structure and an intermediate structure with low catheter processing cost and high processing efficiency.

[0004] In order to solve the above technical problems, the utility model provides a protective structure, including a main body suitable for covering a predetermined position of a workpiece to be cut, and the main body completely or partially blocks the cutting energy when it reaches the predetermined position, thereby avoiding cutting the workpiece to be cut below or reducing the degree of cutting of the workpiece to be cut below to ensure that it is not cut off.

[0005] Optionally, during cutting, the protective structure completely reflects the cutting energy reaching the predetermined position to ensure that the workpiece to be cut below is not cut, or

[0006] During cutting, the protective structure partially reflects, partially absorbs, or completely absorbs the cutting energy reaching the predetermined position, so as to reduce the cutting degree of the workpiece to be cut below.

[0007] Optionally, the body is a metal body with a reflectivity greater than 85%.

[0008] Optionally, the body is a metal body with a reflectivity greater than 90%.

[0009] Optionally, the thickness of the body is less than or equal to 1 / 4 of the length of the connection structure to be formed in the axial direction of the piece to be cut.

[0010] Optionally, the thickness of the body is less than or equal to 1 / 5 of the length of the connection structure to be formed in the axial direction of the piece to be cut.

[0011] Optionally, the metal body is made of gold, silver, copper, tungsten, steel or a metal alloy.

[0012] Optionally, the metal body is a gold flat wire, a silver flat wire, a copper flat wire, a tungsten steel bar or a metal alloy bar.

[0013] Optionally, the body is at least one of a straight line type, a broken line type, a curved line type, a spiral type, a ring type or a cross type.

[0014] Optionally, the linear body is installed on the outer surface of the workpiece to be cut in a manner parallel to the axial direction of the workpiece to be cut.

[0015] Optionally, the annular body is sleeved on the outer surface of the workpiece to be cut at intervals along the axial direction of the workpiece to be cut.

[0016] An intermediate structure is also provided, comprising the protective structure and an intervening structure, wherein the protective structure covers a predetermined position of the intervening structure.

[0017] The technical solution of this utility model has the following advantages:

[0018] 1. The protective structure provided by the present invention, when cutting the workpiece to be cut, since the predetermined position of the workpiece to be cut is covered with the protective structure, and the protective structure will block at least a part of the cutting energy reaching this position, that is, the cutting energy reaching the position below the protective structure is weakened to avoid the workpiece to be cut below being cut or cut off, so that it always remains in a connected state. Therefore, no matter what cutting method is adopted, when cutting to the position where the protective structure is located, the workpiece to be cut below the protective structure will not be cut or cut off, which is equivalent to the cutting at this position being blocked or weakened, thereby realizing continuous cutting at this position without stopping the machine, shortening the processing time, and reducing the processing cost; and a connecting structure is formed at the position where the protective structure is located, thereby ensuring the mechanical properties of the workpiece to be cut in terms of transmitting pushing force, torque and bearing pressure and tension.

[0019] 2. The protective structure provided by the present invention has a main body thickness that is less than or equal to 1 / 5 of the length of the connecting structure required to be formed in the axial direction of the workpiece to be cut, so as to control the tension of the protective structure and reduce costs. At the same time, the thinner wall thickness can effectively reduce vibration and eccentricity during the cutting process.

[0020] 3. The protective structure provided by the present invention has a main body that is at least one of a straight line, a broken line, a curve, a spiral, a ring or a cross, thereby meeting the use requirements of the workpiece to be cut in different occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram before using the protective structure provided by the utility model to cut a catheter;

[0023] Figure 2 This is a schematic diagram of using the protective structure provided by the utility model to cut a catheter;

[0024] Figure 3 for Figure 2 Schematic diagram after removing the protective structure;

[0025] Figure 4 A schematic diagram of a hollowed-out cutting catheter using the annular protective structure provided by the present invention;

[0026] Figure 5 for Figure 4 Schematic diagram after removing the protective structure;

[0027] Figure 6 for Figure 4 Schematic diagram of cutting path during cutting;

[0028] Description of reference numerals:

[0029] 1. Conduit; 2. Connecting structure; 3. Protective structure; 4. Laser cutting machine; 5. Cutting groove. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] During the use of medical catheters, in addition to requiring the catheter to have certain anti-bending and pressure resistance, the catheter is also required to have a certain axial pushing force (to ensure that the catheter can reach the lesion location), good torque transmission performance (the direction of the catheter head can be controlled in vitro) and axial tensile strength (to prevent the catheter from breaking and improve safety). Based on this, in addition to the spiral cutting grooves, the reinforcement layer of the spiral cut stainless steel tube also requires an axial connection structure between the spiral cutting grooves. These connection structures can play a role in transmitting pushing force, transmitting torque, and bearing pressure and tension. This is also the purpose of using intermittent cutting lines in ordinary laser cutting catheters. In order to avoid uneven cutting seams caused by the convergence of cutting energy when the laser beam is suddenly started, such as Figures 1 to 3 As shown, this embodiment provides a protective structure. Taking a stainless steel conduit as an example, the workpiece to be cut includes a body adapted to cover a predetermined position of the workpiece to be cut. When cutting energy reaches the predetermined position, the body completely or partially blocks it, thereby preventing or reducing the extent of cutting of the workpiece below. Specifically, during cutting, the protective structure completely reflects the cutting energy reaching the predetermined position to ensure that the workpiece below is not cut. Alternatively, the protective structure partially reflects, partially absorbs, or completely absorbs the cutting energy reaching the predetermined position to reduce the extent of cutting of the workpiece below.

[0033] Based on the length X of the connecting structure 2 , a metal material with a width equal to X and a laser reflectivity greater than 85% for a wavelength of 1040-1070 nanometers, preferably greater than 90%, such as a gold flat wire, silver flat wire, copper flat wire, tungsten steel bar, or metal alloy bar, is selected to form the protective structure 3 . The material should have a thickness less than or equal to X / 4, preferably less than or equal to X / 5. Of course, other metal alloys that meet these requirements can also be selected as needed.

[0034] The stainless steel conduit 1 to be cut is installed and fixed, and a linear protective structure is selected and fixed on the surface of the stainless steel conduit 1 in a manner parallel to the axis thereof. The ends of the linear protective structure at both ends of the stainless steel conduit 1 are fixed to the conduit 1 by gluing, welding or clamping, and the installation of the protective structure 3 on the workpiece to be cut is completed. Figure 1 As shown, of course, according to actual needs, the protective structure 3 can also be set to at least one of a broken line shape, a curve shape, a spiral shape, a ring shape or a cross shape.

[0035] The stainless steel conduit 1 is placed in a laser cutting machine 4 for laser cutting. The stainless steel conduit 1 is cut using a rare earth-doped fiber laser cutting machine 4. The laser cutting power is 200W, the laser wavelength is 1064 nanometers without considering attenuation, the laser cutting focus is located on the inner wall of the stainless steel conduit, and the spot / focus diameter is 25 microns. When the laser beam encounters the protective structure where the flat copper wire is installed, the laser reflectivity of the copper here increases sharply, which blocks the laser cutting energy, and because the outer surface of the flat copper wire is higher than the outer surface of the stainless steel conduit, the laser cannot converge to the focal position. The laser beam here is blocked by the flat copper wire, and the stainless steel conduit 1 below does not form a cutting groove 5. When the laser beam continues to move to the edge of the flat copper wire, the stainless steel conduit 1 here is exposed to the laser beam, and the laser cutting groove 5 is re-formed. Due to the obstruction of the flat copper wire, continuous cutting of the stainless steel conduit 1 is achieved under the premise of uninterrupted laser cutting energy.

[0036] Of course, the protective structure 3 can also be made of a material that allows part of the laser to penetrate but will not completely cut off the stainless steel conduit 1. At this time, due to the reflection of the protective structure 3, the cutting energy is weakened, thereby ensuring that even if a small amount of laser can reach the surface of the stainless steel conduit 1, it will only form a shallow scratch and will not cut it off, thus meeting the use requirements of the stainless steel conduit 1.

[0037] like Figures 4 to 6 As shown in the figure, it is a schematic diagram of using the annular protective structure provided by the present invention to hollow out and cut a catheter. At this time, the annular protective structure 3 is evenly spaced along the axial direction of the stainless steel catheter 1 and is sheathed on the outer periphery of the stainless steel catheter 1. Specifically, the copper flat wire can be wound axially around the outer periphery of the stainless steel catheter 1. The laser is started normally, and the method is as follows: Figure 6 The predetermined path shown is cut. The predetermined path is composed of multiple closed lines, each of which is a unit. A connection part is reserved between two adjacent units to ensure the continuity of the stainless steel conduit 1. During laser cutting, the starting point and end point of the cutting laser irradiation coincide. The conduit with this structure has both flexibility and overall strength to meet special usage requirements. The annular protective structure 3 is usually set in the middle position of the closed line unit to ensure the strength of the conduit after cutting. When the laser moves to the position where the annular protective structure is located, most of the laser is reflected and cannot reach the surface of the conduit below the protective structure. Therefore, it plays a protective role on the conduit at this position, that is, it prevents cutting at this position, thereby forming a connecting structure in the closed unit and improving the overall strength of the conduit.

[0038] The present application also provides an intermediate structure comprising the protective structure and an intervening structure, wherein the protective structure covers a predetermined position of the intervening structure. The intervening structure is any one of a catheter, a guidewire or a stent, and the protective structure covers the outer surface of the intervening structure as required.

[0039] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A protective structure, characterized in that: It comprises a body suitable for covering a predetermined position of the workpiece to be cut, and the body completely or partially blocks the cutting energy when it reaches the predetermined position, thereby avoiding cutting the workpiece below or reducing the degree of cutting of the workpiece below to ensure that it is not cut.

2. The protective structure according to claim 1, characterized in that: During cutting, the protective structure will completely reflect the cutting energy reaching the predetermined position to ensure that the workpiece to be cut below is not cut, or During cutting, the protective structure partially reflects, partially absorbs, or completely absorbs the cutting energy reaching the predetermined position, so as to reduce the cutting degree of the workpiece to be cut below.

3. The protective structure according to claim 2, characterized in that: The body is a metal body with a reflectivity greater than 85%.

4. The protective structure according to claim 3, characterized in that: The body is a metal body with a reflectivity greater than 90%.

5. The protective structure according to claim 1, characterized in that: The thickness of the body is less than or equal to 1 / 4 of the length of the connecting structure (2) to be formed in the axial direction of the piece to be cut.

6. The protective structure according to claim 5, characterized in that: The thickness of the body is less than or equal to 1 / 5 of the length of the connecting structure (2) to be formed in the axial direction of the piece to be cut.

7. The protective structure according to claim 3, characterized in that: The metal body is made of gold, silver, copper, tungsten, steel or a metal alloy.

8. The protective structure according to claim 7, characterized in that: The metal body is a gold flat wire, a silver flat wire, a copper flat wire, a tungsten steel bar or a metal alloy bar.

9. The protective structure according to any one of claims 1 to 8, characterized in that: The body is at least one of a straight line, a broken line, a curve, a spiral, a ring or a cross.

10. The protective structure according to claim 9, characterized in that: The linear body is installed on the outer surface of the workpiece to be cut in a manner parallel to the axial direction of the workpiece to be cut.

11. The protective structure according to claim 9, characterized in that: The annular body is sleeved on the outer surface of the workpiece to be cut at intervals along the axial direction of the workpiece to be cut.

12. An intermediate structure, characterized in that The protective structure according to any one of claims 1 to 11 further comprises an intervening structure, wherein the protective structure covers a predetermined position of the intervening structure.

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