Internal supporting device for catheter shaping

Abstract

The invention provides a conduit reshaping internal supporting device which comprises a main body conical positioning mandrel and a reducing assembly, the main body conical positioning mandrel comprises a conical section located in the axial middle of the main body conical positioning mandrel, a first equal-diameter section and a second equal-diameter section, the first equal-diameter section and the second equal-diameter section are located on the two sides of the conical section, and the second equal-diameter section is located on the outer side of the large-diameter end of the conical section; a limiting piece is arranged on the side, away from the conical section, of the second equal-diameter section. The variable-diameter assembly is of a variable-diameter hollow structure, the inner side wall of the variable-diameter assembly is provided with an inclined annular surface section matched with the inclined side wall of the conical section, the main body conical positioning mandrel penetrates through the variable-diameter assembly, and during use, the main body conical positioning mandrel is arranged in the guide pipe, and the variable-diameter assembly moves in the direction from the first equal-diameter section to the second equal-diameter section; and the inclined ring surface section is completely and tightly attached to the conical section. The internal supporting device for catheter reshaping can be used for catheter reshaping at the catheter end part and can also be used for better realizing reshaping of the catheter far away from the catheter end part.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pipe shaping, and particularly relates to a catheter shaping internal support device. BACKGROUND

[0002] With the rapid development of aviation and aerospace technology, the requirements for the spatial geometric size and appearance quality of catheters are increasingly high. From the catheter raw material to the assembly of the final catheter product, there is a possibility that a dent will be left on the surface of the catheter due to collision. Once the dent is generated, it is difficult for process personnel and operators to immediately find an effective way to eliminate such defects. Initially, technical personnel can repair the dent and non-circular condition of the end of the catheter to a certain extent by designing tools, and the processed product can basically meet the quality requirements.

[0003] At present, there are some inventions and invention patents for repairing catheter dent defects, which basically focus on the shaping and roundness correction of the catheter within a certain range of the end of the catheter, and to a certain extent, solve the defect problem of the catheter. These parts are relatively easy to process, so these technologies have obvious limitations and cannot shape and round the parts far from the end of the catheter. For example, patent 201821926420.2 (pipe rounder) can effectively trim the non-circular condition of the pipe opening, and is suitable for trimming the pipe opening welding end and the nearby catheter part, but it cannot trim the parts far from the pipe end that need to be shaped, and its limitations are obvious. SUMMARY

[0004] In view of the above problems, the present application provides a catheter shaping internal support device, which can be used for catheter shaping at the pipe end, and can also better achieve catheter shaping at the pipe end part far away from the pipe end. The common length range of 100mm-1500mm from the end of the aviation and aerospace catheter can be shaped, the application range is greatly widened, the operation is relatively easy, the product scrap due to the inability to shape and repair the dent defects in the long range of the catheter is avoided, and the qualified rate of the catheter product is improved.

[0005] To achieve the above purpose, the present application adopts the following technical solution: The application discloses a catheter shaping internal support device which comprises a main body tapered positioning mandrel and a variable-diameter assembly. The main body tapered positioning mandrel comprises a tapered section located in the axial middle part and a first equal-diameter section and a second equal-diameter section located on both sides of the tapered section. The second equal-diameter section is located outside the large-diameter end of the tapered section, and a limiting piece is arranged on the side of the second equal-diameter section away from the tapered section. The variable-diameter assembly is a variable-diameter hollow structure, and the inner side wall of the variable-diameter assembly is provided with an inclined annular surface section matched with the inclined side wall of the tapered section. The main body tapered positioning mandrel penetrates through the variable-diameter assembly. In use, the main body tapered positioning mandrel is arranged in the catheter, and the variable-diameter assembly is moved from the first equal-diameter section to the second equal-diameter section until the inclined annular surface section is completely and closely matched with the tapered section.

[0006] Further, the variable-diameter assembly comprises an upper annular block, at least three intermediate support blocks and a lower annular block. The at least three intermediate support blocks are annularly distributed and surround the main body tapered positioning mandrel to form a cylindrical structure. The intermediate support blocks comprise an inner diameter variable-diameter arc-shaped block and an upper positioning arc-shaped block and a lower positioning arc-shaped block connected to both ends of the inner diameter variable-diameter arc-shaped block in the axial direction. The inner side wall of the inner diameter variable-diameter arc-shaped block comprises an inclined arc surface, and the inclined arc surfaces of the at least three variable-diameter arc-shaped blocks form the inclined annular surface section. The outer diameters of the upper positioning arc-shaped block and the lower positioning arc-shaped block are smaller than the outer diameter of the variable-diameter arc-shaped block. The outer diameters of the upper positioning arc-shaped block and the lower positioning arc-shaped block are the same as the ring hole inner diameters of the upper annular block and the lower annular block respectively. The upper positioning arc-shaped block extends into the ring hole of the upper annular block, and the lower positioning arc-shaped block extends into the ring hole of the lower annular block. In use, the upper annular block is finally sleeved on the second equal-diameter section and abuts against the limiting piece.

[0007] Further, the inner side wall of the inner diameter variable-diameter arc-shaped block further comprises a first equal-diameter arc surface and a second equal-diameter arc surface located at both ends of the inclined arc surface in the axial direction. The diameters of the first equal-diameter arc surface and the second equal-diameter arc surface are the same as the diameters of the first equal-diameter section and the second equal-diameter section respectively.

[0008] Further, the first equal-diameter section is provided with an external thread and is screwed with a nut.

[0009] Further, the diameter of the first equal-diameter section is the same as the diameter of the small-diameter end of the tapered section, and the diameter of the second equal-diameter section is the same as the diameter of the large-diameter end of the tapered section. Further, the limiting piece is a limiting ring, and one end of the second equal-diameter section close to the limiting ring is fixedly connected with the limiting ring.

[0010] Further, a hexagonal hole coaxial with the limiting ring is arranged on the limiting ring, and a threaded hole coaxial with the second equal-diameter section is arranged on one end of the second equal-diameter section close to the limiting ring.

[0011] Further, the outer diameters of the upper ring block, the lower ring block, the limiting ring and the intermediate support block are the same, and are the same as the inner diameter of the conduit.

[0012] The conduit shaping internal support device of the present application uses the taper surface adjustment function of the structure to adjust the size of the outer diameter of the middle part of the structure, so that the tool is inserted into the conduit shaping part in the state that the outer diameter of the middle part of the structure is small, and then the outer diameter of the middle part of the structure is finely adjusted to the designed maximum size, so as to provide sufficient internal support to the conduit shaping part, and then the copper rod and other auxiliary tools are used to tap the outer wall pit of the conduit, so as to realize the repair and elimination of the pit; or when the part of the conduit is not round, the tool is rotated in the circumferential direction to realize the rounding of the conduit.

[0013] Compared with the prior art, the present application has the following advantages: (1) The cooperation of the outer taper surface structure of the main body taper positioning mandrel and the inner taper surface structure of the intermediate support block is adopted for the first time, the size of the large cylindrical surface of the working part of the conduit shaping internal support tool is adjusted, the installation is convenient, the strength is good, and the positioning is reliable; (2) The ring positioning structure of the upper ring block and the lower ring block is adopted for the first time to realize the relative fixation of the intermediate support block, so that the three equal blocks form an integral structure, which can work reliably. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a disassembled front view of the conduit shaping internal support device of the present application.

[0015] Figure 2 It is a combined view of the conduit shaping internal support device of the present application in use.

[0016] Figure 3 It is a perspective view of the main body taper positioning mandrel of the present application.

[0017] Figure 4 It is a side view of the main body taper positioning mandrel of the present application.

[0018] Figure 5 It is a perspective view of the three intermediate support blocks combined of the present application.

[0019] Figure 6 It is a side view of the three intermediate support blocks combined of the present application.

[0020] Figure 7 It is a top view of the intermediate support block of the present application.

[0021] Among them, 1-main body conical positioning mandrel, 2-upper annular block, 3-middle support block, 4-lower annular block, 5-external hexagonal nut, 101-conical section, 102-first equal diameter section, 103-second equal diameter section, 104-limiting ring, 301-inner diameter variable arc block, 302-upper positioning arc block, 303-lower positioning arc block, 3031-inclined arc surface, 3032-first equal diameter arc surface, 3033-second equal diameter arc surface. 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 some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figures 1-7 As shown, an internal support device for catheter shaping includes a main conical positioning mandrel 1 and a diameter-changing assembly. The main conical positioning mandrel 1 includes a conical segment 101 located at its axial center and a first equal-diameter segment 102 and a second equal-diameter segment 103 located on both sides of the conical segment 101. The second equal-diameter segment 103 is located outside the large-diameter end of the conical segment 101, and a limiting member is provided on the side of the second equal-diameter segment 103 away from the conical segment 101. The diameter-changing assembly is a hollow structure with a variable diameter. The inner sidewall of the diameter-changing assembly is provided with an inclined annular surface segment adapted to the inclined sidewall of the conical segment 101. The main conical positioning mandrel 1 passes through the diameter-changing assembly. In use, the main conical positioning mandrel 1 is placed inside the catheter, and the diameter-changing assembly moves from the first equal-diameter segment 102 to the second equal-diameter segment 103 until the inclined annular surface segment is completely and tightly fitted with the conical segment 101.

[0024] Specifically, in the embodiment, the variable-diameter assembly includes an upper annular block 2, three intermediate support blocks 3, and a lower annular block 4. The three intermediate support blocks 3 are annularly distributed to form a cylindrical structure around the main body conical positioning mandrel 1. The intermediate support blocks 3 include an inner-diameter variable-diameter arc-shaped block 301, and an upper positioning arc-shaped block 302 and a lower positioning arc-shaped block 303 connected to the two ends of the inner-diameter variable-diameter arc-shaped block 301 in the axial direction. The inner side wall of the inner-diameter variable-diameter arc-shaped block 301 includes an inclined arc surface 3031, and the inclined arc surfaces 3031 of the three variable-diameter arc-shaped blocks form the inclined annular surface section. The outer diameters of the upper positioning arc-shaped block 302 and the lower positioning arc-shaped block 303 are smaller than the outer diameter of the inner-diameter variable-diameter arc-shaped block 301. The outer diameters of the upper positioning arc-shaped block 302 and the lower positioning arc-shaped block 303 are the same as the inner diameters of the ring holes of the upper annular block 2 and the lower annular block 4, respectively. The upper positioning arc-shaped block 302 extends into the ring hole of the upper annular block 2, and the lower positioning arc-shaped block 303 extends into the ring hole of the lower annular block 4. In use, the upper annular block 2 is finally sleeved on the second constant-diameter section 103 and abuts against the limiting member.

[0025] Further, the inner side wall of the inner-diameter variable-diameter arc-shaped block 301 further includes a first constant-diameter arc surface 3032 and a second constant-diameter arc surface 3033 located at the two ends of the inclined arc surface 3031 in the axial direction. The diameters of the first constant-diameter arc surface 3032 and the second constant-diameter arc surface 3033 are the same as the diameters of the first constant-diameter section 102 and the second constant-diameter section 103, respectively.

[0026] It can be understood that, in use, the intermediate support blocks 3 are installed in the positioning ring holes of the upper annular block 2 and the lower annular block 4, and the centers of the intermediate support blocks 3 are located on the main body conical positioning mandrel 1. The upper annular block 2 and the lower annular block 4 are installed on the main body conical positioning mandrel 1, and the outer hexagonal nut 5 is installed on the threaded shaft at the end of the main body conical positioning mandrel 1, so that the upper annular block 2, the lower annular block 4, and the intermediate support blocks 3 are assembled and fixed together with the main body conical positioning mandrel 1.

[0027] Among them, the main body conical positioning mandrel 1 is located in the middle of the entire catheter shaping internal support tool; the upper annular block 2 is located on the left side of the large round head of the main body conical positioning mandrel 1; the intermediate support blocks 3 are located in the middle of the entire catheter shaping internal support tool, between the upper annular block 2 and the lower annular block 4; the lower annular block 4 is located on the left side of the main body conical positioning mandrel 1; and the outer hexagonal nut 5 is located on the leftmost side of the entire catheter shaping internal support tool, on the left side of the lower annular block 4.

[0028] The main body tapered positioning mandrel 1 is used for connection and positioning of the whole conduit shaping internal support tool; the middle support block 3 is used for realizing the conduit inner hole shaping support function; the upper annular block 2 and the lower annular block 4 realize the constraint and relative fixation of the middle support block 3, and the three identical middle support blocks form a cylindrical body.

[0029] Further, the first constant diameter section 102 is provided with an external thread and is screwed with a nut. In the embodiment, the nut is an external hexagonal nut 5. In this way, the external hexagonal nut 5 is used to realize the locking and fixation of the whole conduit shaping internal support tool.

[0030] In the embodiment, the diameter of the first constant diameter section 102 is the same as the diameter of the small diameter end of the tapered section 101, and the diameter of the second constant diameter section 103 is the same as the diameter of the large diameter end of the tapered section 101; the outer diameters of the upper annular block 2, the lower annular block 4, the limiting ring 104 and the middle support block 3 are the same, and are the same as the inner diameter of the conduit; the limiting member is the limiting ring 104, and one end of the second constant diameter section 103 close to the limiting ring 104 is fixedly connected with the limiting ring 104. Of course, in other embodiments, the limiting member can also be other structural forms, for example, a plurality of limiting columns uniformly distributed along the circumference of the second constant diameter section. The limiting ring 104 is provided with a hexagonal hole 1041 coaxially arranged thereon, and the one end of the second constant diameter section 103 close to the limiting ring 104 is provided with a threaded hole 1031 coaxially arranged thereon.

[0031] The working principle of the conduit shaping internal support device is as follows: a. The adjustment of the conduit shaping internal support tool is realized by gradually moving the middle support block 3 along the taper surface of the main body tapered positioning mandrel 1 from left to right; b. The upper annular block 2 and the lower annular block 4 provide the fixing and support function in the whole process of gradually moving the middle support block 3 along the taper surface of the main body tapered positioning mandrel 1 from left to right, so that the three independent blocks are finally formed into a cylindrical whole; c. The cooperation and gradual screwing of the tail end screw of the main body tapered positioning mandrel 1 with the internal thread of the external hexagonal nut 5, and the outer cylindrical surface formed by the middle support block 3 gradually increases, and when the right side of the upper annular block 2 contacts with the left end surface of the large circular step of the main body tapered positioning mandrel 1, the outer cylindrical surface formed by the middle support block 3 reaches the maximum value.

[0032] The tapering positioning structure of the main tapering positioning mandrel 1 can realize the size adjustment of the radial dimension of the working site; the internal taper of the intermediate support block 3 is designed to realize the cooperation with the external taper of the main tapering positioning mandrel 1, which can adjust the extremely ideal cylindrical surface size of the working site, realize the perfect fit and support with the inner diameter of the catheter, and achieve the purpose of shaping and correcting the catheter; the annular positioning structure of the upper annular block 2 and the lower annular block 4 can realize the relative fixation of the intermediate support block 3, so that the three equal blocks form an integral structure and can work reliably; the hexagonal hole 1041 at the large round head end of the main tapering positioning mandrel 1 is convenient for installation and operation, and the threaded hole 1031 structure below the hexagonal hole 1041 is used to realize the transportation of the catheter shaping internal support tool to the deeper shaping site in the catheter; the height size of the upper annular block 2 can play a limiting role in the assembly of the catheter shaping internal support tool to the in-place state, that is, when it is finally tightened to the state that the left end face of the large round head of the main tapering positioning mandrel 1 is close to the one side end face of the upper annular block 2, the large cylindrical surface of the working site of the catheter shaping internal support tool reaches the maximum at this time, and the shaping effect is best at this time.

[0033] Those skilled in the art should understand that the above description is only a specific embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An internal support device for catheter shaping, characterized in that, The device includes a main conical positioning mandrel and a variable diameter assembly. The main conical positioning mandrel includes a conical section located at its axial center and a first equal diameter section and a second equal diameter section located on both sides of the conical section. The second equal diameter section is located outside the large diameter end of the conical section, and a limiting member is provided on the side of the second equal diameter section away from the conical section. The variable diameter assembly is a hollow structure with a variable diameter. The inner sidewall of the variable diameter assembly is provided with an inclined annular surface section that matches the inclined sidewall of the conical section. The main conical positioning mandrel passes through the variable diameter assembly. In use, the main conical positioning mandrel is placed inside the conduit, and the variable diameter assembly moves from the first equal diameter section to the second equal diameter section until the inclined annular surface section is completely and tightly fitted with the conical section.

2. The internal support device for catheter shaping according to claim 1, characterized in that, The variable diameter assembly includes an upper annular block, at least three intermediate support blocks, and a lower annular block. The at least three intermediate support blocks are arranged in a ring and form a cylindrical structure around the main conical positioning mandrel. Each intermediate support block includes an inner diameter variable arc block and an upper positioning arc block and a lower positioning arc block connected to the two ends of the inner diameter variable arc block in the axial direction. The inner sidewall of the inner diameter variable arc block includes an inclined arc surface, and the inclined arc surfaces of the at least three variable diameter arc blocks form the inclined annular segment. The outer diameters of the upper positioning arc block and the lower positioning arc block are both smaller than the outer diameter of the variable diameter arc block. The outer diameters of the upper positioning arc block and the lower positioning arc block are the same as the inner diameters of the annular holes of the upper annular block and the lower annular block, respectively. The upper positioning arc block extends into the annular hole of the upper annular block, and the lower positioning arc block extends into the annular hole of the lower annular block. In use, the upper annular block is finally fitted onto the second equal diameter segment and abuts against the limiting member.

3. The internal support device for catheter shaping according to claim 2, characterized in that, The inner sidewall of the variable diameter arc block also includes a first equal diameter arc surface and a second equal diameter arc surface located at both ends of the inclined arc surface in the axial direction. The diameters of the first equal diameter arc surface and the second equal diameter arc surface are the same as the diameters of the first equal diameter segment and the second equal diameter segment, respectively.

4. The internal support device for catheter shaping according to claim 1, characterized in that, The first equal-diameter section is provided with external threads and is screwed with a nut.

5. The internal support device for catheter shaping according to claim 1, characterized in that, The diameter of the first equal-diameter section is the same as the diameter of the small-diameter end of the tapered section, and the diameter of the second equal-diameter section is the same as the diameter of the large-diameter end of the tapered section.

6. The internal support device for catheter shaping according to claim 2, characterized in that, The limiting component is a limiting ring, and the end of the second equal diameter section near the limiting ring is fixedly connected to the limiting ring.

7. The internal support device for catheter shaping according to claim 6, characterized in that, The limiting ring is provided with a hexagonal hole coaxially arranged with it, and the second equal diameter section is provided with a threaded hole coaxially arranged with it at one end near the limiting ring.

8. The internal support device for catheter shaping according to claim 6, characterized in that, The outer diameters of the upper annular block, the lower annular block, the limiting ring, and the intermediate support block are the same, and all are the same as the inner diameter of the conduit.

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