Method and device for fixing catheter tube end

Abstract

The present invention discloses a method and device for fixing the end of a catheter, comprising an inner support body, a push rod and a plurality of outer chucks; the push rod can expand the deformed end of the inner support body when it moves axially; the plurality of outer chucks are arranged around the inner support body; when fixing the end of the catheter, the catheter is sleeved on the deformed end of the inner support body; then the push rod and the plurality of outer chucks are driven simultaneously, so that the push rod pushes the inner wall of the inner support body to expand the deformed end of the inner support body, and the plurality of outer chucks approach the outer wall of the catheter, thereby allowing the inner support body and the plurality of outer chucks to simultaneously complete the clamping of the fixed end of the catheter, at which time the deformed end of the inner support body is located inside the chucks. In this way, clamping can be completed simultaneously from both the inner and outer sides of the catheter, without the need for step-by-step operation, and the consistency of each component is better, which not only improves the efficiency of catheter clamping, but also ensures the roundness of the catheter end.

Description

Technical Field

[0001] The present invention relates to the field of aerospace, and in particular to a method and device for fixing a catheter tube end. Background Art

[0002] Aircraft and rocket tubes perform crucial tasks during preparation, including fuel input, mechanism activation, pressure control, and environmental regulation. Failure or damage in any of these components can lead to tragedy and directly impact human safety. During tube bending, the clamping force of the trolley can cause deformation of the tube ends, particularly for thin-walled tubes. Too little clamping force can prevent the tube from being held securely, while too much can damage it. Therefore, a design is needed that ensures secure clamping without compromising the surface finish or roundness.

[0003] Patent document CN113199761A discloses a PE hose variable diameter welding device, comprising an outer clamping device with a circular opening and closing structure that clamps the PE hose from the outside; an inner support device comprising a first inner support device and a second support device of identical structure. The first inner support device comprises a plurality of support structures arranged in a circular pattern that can rotate and extend radially relative to a center position. The inner support device and the outer clamping device are coaxially arranged, and the support structures contact the inner sidewall of the PE hose to support the PE hose. The first inner support device and the second support device are respectively located on either side of the outer clamping device. The first inner support device and the second support device have the same structure. The first inner support device includes a plurality of radially arranged length adjustment screws, each of which has a support plate at its end, and is connected to a hydraulic cylinder. The extension length of the screw is adjusted by controlling the length of the oil cylinder; the external clamping device includes an upper circle clamping device, a lower circle clamping device, and a fixed structure. The upper circle clamping device and the lower circle clamping device are respectively semi-circular structures. The upper circle clamping device and the lower circle clamping device cooperate to form a circular ring structure. The lower circle clamping device is fixedly connected to the fixed structure; the upper circle clamping device and the lower circle clamping device respectively include a semi-circular fixed ring plate and a plurality of rotation adjustment devices. The rotation adjustment device extends along the direction of the circular diameter and is connected to the semi-circular fixed ring plate. The rotation adjustment device includes a worm adjustment device, an adjustment sprocket, and a rotating guide wheel. The worm adjustment device includes a worm wheel and a worm. One end of the worm is connected to the rotating guide wheel. The adjustment sprocket is cooperatively connected to the worm wheel. The worm extends along the diameter.

[0004] Although the existing technology has achieved clamping on both the inside and outside of the tube, the existing technology still has the following problems: 1) Since the tube wall of the rocket tube is very thin, the coaxiality of the various surfaces supporting the inner side of the tube is required to be extremely high during tube processing. This places extremely high demands on the positioning accuracy of each support plate of the first internal support device and the second support device in the existing technology. Moreover, since each support plate is controlled by a separate oil cylinder, the consistency of the movement of each support plate cannot be guaranteed; 2) The devices for external clamping and internal support cannot clamp the tube at the same time; 3) The device is large in size and has poor uniformity in movement, which can easily damage the tube wall. Summary of the Invention

[0005] In order to solve the problem in the prior art that the roundness of the catheter end cannot be guaranteed during catheter processing, the purpose of the present invention is to provide a method and device for fixing the catheter end, which can quickly clamp the catheter end from both the inside and outside of the catheter, thereby ensuring the roundness of the catheter end and avoiding damage to the catheter wall.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] A method for fixing a catheter end includes an inner support body, a push rod, and multiple external clamps; one end of the inner support body is a deformable end, and one end of the push rod is inserted into the inner support body. When the push rod moves axially, it can expand the deformable end of the inner support body; the multiple external clamps are arranged around the inner support body. The specific steps of fixing the catheter end are as follows:

[0008] Step 1) Multiple outer clamps are simultaneously expanded outward, and the inner support body is in a contracted state;

[0009] Step 2) Slip the fixed end of the catheter onto the deformed end of the inner support body;

[0010] Step 3) Simultaneously driving the push rod and the multiple outer chucks, the push rod pushing the inner wall of the inner support body to expand the deformed end of the inner support body, and the multiple outer chucks approaching the outer wall of the catheter, thereby allowing the inner support body and the multiple outer chucks to simultaneously clamp the fixed end of the catheter, at which point the deformed end of the inner support body is located inside the chucks;

[0011] Step 4) When removing the catheter, the push rod and the multiple outer clamps are driven to reset, so that the inner support body returns to the contracted state, and the multiple outer clamps are simultaneously expanded outward, and then the catheter is removed from the inner support body.

[0012] Preferably, it also includes a support tube, an inner push tube, an outer push tube and a driving member, the support tube is sleeved on the inner push tube, the outer push tube is sleeved on the support tube, the inner support body is installed on the support tube, the push rod is fixed on one end of the support tube, one end of the outer clamp is hinged to the support tube, and the driving member is installed on the support tube and can drive the outer push tube and the inner push tube to move; in the step 3), the driving member drives the outer push tube and the inner push tube to move, the inner push tube drives the push rod to move, so that the push rod drives the deformed end of the inner support body to open outward, and the outer push tube simultaneously drives multiple outer clamps to move, so that the multiple outer clamps simultaneously abut the outer wall of the catheter.

[0013] Preferably, the driving member comprises an electric push cylinder mounted on a support tube, the telescopic end of the electric push cylinder being connected to a linkage block. The inner push tube is fixedly connected to the outer push tube via the linkage block. In step 3), the electric push cylinder drives the inner push tube and the outer push tube to move simultaneously and the same distance via the linkage block, thereby simultaneously securing both the inner and outer sides of the catheter.

[0014] Preferably, the inner support body is slidably mounted on the support tube; in the step 3), when the catheter is fixed, the deformed end of the inner support body and the push rod approach each other; in the step 4), when the catheter is loosened, the deformed end of the inner support body and the push rod move away from each other.

[0015] Preferably, one end of the outer chuck is an arc-shaped end with a gradual radius, and the inner support body is fixed on the limiting sleeve. The limiting sleeve is slidably connected to the support tube, and one end of the limiting sleeve is against the arc-shaped end of the outer chuck, one leg of the spring is connected to the support tube, and the other leg of the spring is connected to the limiting sleeve; in the step 3), when the outer push tube drives the outer chuck to swing, the arc-shaped end of the outer chuck pushes the limiting sleeve toward the inner push tube, the spring is stretched, and the limiting sleeve drives the inner support body to move toward the inner push tube, so that the inner support body and the push rod move relative to each other; in the step 4), when the outer push tube moves away from the outer chuck, the spring pulls the limiting sleeve to push the arc-shaped end of the outer chuck, so that multiple outer chucks are simultaneously opened outward away from the catheter, and the spring pulls the inner support body away from the inner push tube through the limiting sleeve, so that the inner support body and the push rod move relative to each other.

[0016] Preferably, an inner conical surface is provided on one end of the push-out tube close to the outer chuck, and an arc surface matching the inner conical surface is provided on the outer chuck; in step 3), when the push-out tube moves, the arc surface of the outer chuck gradually abuts against the inner conical surface of the outer push rod, and multiple outer chucks are gradually inserted into the push-out tube.

[0017] Preferably, a rubber pad is fixedly mounted on the outer chuck.

[0018] Preferably, the inner support body is cylindrical in the expanded state and conical in the contracted state.

[0019] Preferably, the inner wall of the inner support body in the expanded state includes a first cylindrical connecting surface, a second conical connecting surface and a third connecting surface, the first connecting surface and the second connecting surface are connected by the third connecting surface, the first connecting surface, the second connecting surface and part of the third connecting surface are located at the deformation end of the inner support body, and the second connecting surface is located at the first connecting end opposite to the deformation end; in the step 3), the push rod pushes the third connecting surface to expand the inner support body in the contracted state, the outer diameter of the inner support body in the expanded state matches the inner diameter of the catheter, and the inner diameter of the first connecting surface matches the outer diameter of the push rod; in the step 4), after the push rod withdraws from the first connecting surface and the third connecting surface, the inner support body returns to the contracted state.

[0020] A catheter tube end fixing device, using the above catheter tube end fixing method

[0021] The beneficial effects of the technical solution of the present invention are: through the above method and structure, clamping is completed simultaneously from the inner and outer sides of the catheter without the need for step-by-step operation. This not only improves the efficiency of catheter clamping and ensures the roundness of the catheter tube end, but also ensures the consistency of the actions of the inner support body and multiple outer clamps, so that the gap at each point between the outer clamp and the inner support body is controllable, and the consistency of the gap at each point between the outer clamp and the inner support body is achieved each time the catheter is clamped, which completes the clamping without damaging the catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Figure 1: Schematic diagram of the structure of the catheter end fixing device when the catheter is in the clamping state Figure 1 ;

[0023] Figure 2 Figure 1: Schematic diagram of the structure of the catheter end fixing device when the catheter is in the clamping state Figure 2 ;

[0024] Figure 3 Schematic diagram of the connection structure of the outer push tube, support tube, inner push tube, inner support body and outer clamp when the catheter is in the clamping state Figure 1 ;

[0025] Figure 4 Schematic diagram of the connection structure of the outer push tube, support tube, inner push tube, inner support body and outer clamp when the catheter is in the clamping state Figure 2 ;

[0026] Figure 5 FIG. 1 is a structural diagram of a catheter end fixing device when the catheter is in a loosened state;

[0027] Figure 6 Schematic diagram of the connection structure of the outer push tube, the support tube, the inner push tube, the inner support body and the outer clamp when the catheter is in a loose state;

[0028] Figure 7 : A structural diagram of a limiting sleeve;

[0029] Figure 8 Schematic diagram of the structure of the outer chuck;

[0030] Figure 9 Schematic diagram of the structure of the inner support body.

[0031] Figure markings: 1. Support tube; 11. Linkage block; 2. Inner push tube; 3. Outer push tube; 4. Connecting sleeve; 41. Second connecting part; 42. Avoidance groove; 43. First mounting part; 44. Deformation hole; 5. Outer chuck; 51. Arc end; 52. Second mounting part; 53. Arc surface; 54. Rubber pad; 6. Inner support body; 61. Limiting sleeve; 62. First positioning ring; 63. Spring; 64. First connecting surface; 65. Second connecting surface; 66. Third connecting surface; 67. First connecting end; 7. Push rod; 71. Second positioning ring; 8. Electric push cylinder; 81. Mounting seat; 82. Shift fork; 83. Limiting plate; 84. Drive sleeve; 9. Conduit. Implementation Method

[0032] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise explicitly specified.

[0035] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] The orientations described in the following embodiments are Figure 1 The position of the outer chuck is on the left, and the position of the mounting base is on the right. Example

[0038] like Figures 1-6 The method for fixing the end of a catheter is shown, comprising an inner support body 6, a push rod 7, and a plurality of external clamps 5; one end of the push rod 7 is inserted into the inner support body 6, one end of the inner support body 6 is a deformable end 68, and the inner side of the deformable end 68 of the inner support body 6 is provided with an inclined surface. When the push rod 7 moves axially, it can push the inclined surface of the inner support body 6, causing the deformable end 68 of the inner support body 6 to open outward; multiple external clamps 5 are arranged around the inner support body 6; one end of the catheter 9 is a fixed end; the specific steps for fixing the end of the catheter 9 are as follows:

[0039] Step 1) The multiple outer clamps 5 are simultaneously expanded outward, and the inner support body 6 returns to a contracted state, thereby increasing the distance between the inner support body 6 and the outer clamps 5;

[0040] Step 2) If Figure 2 and Figure 4 As shown, the fixed end of the catheter 9 is sleeved on the deformed end 68 of the inner support body 6;

[0041] Step 3) If Figure 1-4As shown, the push rod 7 and the multiple outer clamps 5 are driven simultaneously, the push rod 7 pushes the inner wall of the inner support body 6 to expand the deformed end of the inner support body 6, and the multiple outer clamps 5 approach the outer wall of the catheter, so that the inner support body 6 and the multiple outer clamps 5 simultaneously complete the clamping of the fixed end of the catheter from both the inner and outer sides. At this time, the deformed end of the inner support body 6 is located inside the outer clamps 5;

[0042] Step 4) If Figure 5 and Figure 6 As shown, when the catheter 9 is removed, the driving rod 7 and the multiple outer clamps 5 are reset, so that the inner support body 6 returns to the contracted state, the multiple outer clamps 5 are simultaneously expanded outward, and then the catheter 9 is taken out from the inner support body 6.

[0043] Through the above method and structure, clamping is completed simultaneously from the inner and outer sides of the catheter 9 without the need for step-by-step operation. This not only improves the efficiency of clamping the catheter 9 and ensures the roundness of the tube end of the catheter 9, but also ensures the consistency of the actions of the inner support body 6 and the multiple outer clamps 5, so that the gaps at various points between the outer clamps 5 and the inner support body 6 are controllable, and the consistency of the gaps at various points between the outer clamps 5 and the inner support body 6 is achieved each time the catheter 9 is clamped, thus completing the clamping without damaging the catheter 9.

[0044] A catheter tube end fixing device, which applies the above-mentioned catheter tube end fixing method, the catheter tube end fixing device includes an inner support body 6, a push rod 7 and a plurality of external clamps 5; one end of the push rod 7 is inserted into the inner support body 6, one end of the inner support body 6 is a deformation end 68, and the inner side of the deformation end 68 of the inner support body 6 is provided with an inclined surface, and the push rod 7 can push the inclined surface of the inner support body 6 when moving axially, so that the deformation end 68 of the inner support body 6 opens outward; multiple external clamps 5 are arranged around the inner support body 6, and the end surface of the clamping block for abutting the outer wall of the catheter 9 is the clamping surface; one end of the catheter 9 is a fixed end. In this embodiment, the tube end fixing device of the catheter 9 also includes a support tube 1, an inner push tube 2, an outer push tube 3 and a driving member. The support tube 1 is sleeved on the inner push tube 2, and the outer push tube 3 is sleeved on the support tube 1. The inner push tube 2 and the outer push tube 3 are fixedly connected. The inner support body 6 is installed on the support tube 1, and the right end of the push rod is inserted into the inner push tube 2 and threadedly connected. In this way, the depth of the push rod 7 inserted into the inner push tube 2 can be adjusted by rotating the push rod 7, and then the timing of the push rod 7 pushing the inner support body 6 to expand can be adjusted, so that the inner support body 6 supports the inner wall of the catheter first or the inner support body 6 and the outer clamp 5 clamp the catheter at the same time; a second positioning ring 71 is sleeved on the push rod 7, and the second positioning ring 71 is sleeved on the push rod 7. The second positioning ring can be a wear-resistant ring. The second positioning ring 71 is located within the limiting sleeve 61. The outer side of the second positioning ring 71 abuts against the inner wall of the limiting sleeve 61, thereby ensuring the stability of the movement of the push rod 7. One end of the outer clamp 5 is hinged to the support tube 1. The driving member is installed on the support tube 1 and can drive the outer push tube 3 and the inner push tube 2 to move. In step 3), after the driving member drives the outer push tube 3 and the inner push tube 2 to move, the inner push tube 2 drives the push rod 7 to move, so that the push rod 7 drives the deformed end 68 of the inner support body 6 to open outward. The outer push tube 3 drives the multiple outer clamps 5 to swing simultaneously, so that the multiple outer clamps 5 simultaneously abut the outer wall of the catheter 9. This arrangement ensures the consistency of the movement of the multiple outer clamps 5 through the tubular outer push tube 3. Moreover, the outer push tube 3 and the inner push tube 2 are driven by the same driving member, further improving the consistency of the movement of the inner support body 6 and the multiple outer clamps 5, ensuring the consistency of the movement stroke of the inner support body 6 and the multiple outer clamps 5, and improving the security of the catheter 9 clamping. Furthermore, the second positioning ring 71 may also be an elastic component, so that when the second positioning ring 71 abuts against the first positioning ring 62 , the second positioning ring 71 can be deformed to ensure that the push rod 7 and the limiting sleeve 61 are coaxial.

[0045] In order to ensure the consistency of the movements of the inner support body 6 and the multiple outer chucks 5, in this embodiment, the driving member includes an electric push cylinder 8, which is installed on the support tube 1. The telescopic end of the electric push cylinder 8 is connected to the linkage block 11, and the inner push tube is fixedly connected to the outer push tube through the linkage block 11; in the step 3), the electric push cylinder 8 drives the inner push tube 2 and the outer push tube 3 to move the same distance at the same time through the linkage block 11, so that the inner and outer sides of the catheter 9 are fixed at the same time. In this way, the linkage block 11 that fixes the inner push tube 2 and the outer push tube 3 is driven by a power source, so that the inner push tube 2 and the outer push tube 3 can move at the same time, and the stroke and direction of the movement are consistent. Further, as Figure 1 、 Figure 2 and Figure 5 As shown, the support tube 1 is provided with a first positioning hole extending radially, the outer push tube 3 is provided with a second positioning hole extending radially, and the inner push tube 2 is provided with a third positioning hole extending radially. There are two linkage blocks 11, and the two linkage blocks 11 are inserted into the second positioning hole, the first positioning hole and the third positioning hole in sequence from both sides of the second positioning hole. The linkage block is tightly matched with the third positioning hole, and the linkage block slides with the first positioning hole and the second positioning hole. A fixing ring is sleeved on the outer push tube 3, and the fixing ring is fixedly connected to the two linkage blocks 11 by a plurality of bolts. A drive sleeve 84 is also sleeved on the support tube 1, and the drive sleeve is slidably connected to the support tube. The drive sleeve is located on the right side of the outer push tube, and the drive sleeve 84 is fixedly connected to the outer push tube 3. An annular drive groove is provided on the drive sleeve 84, and the support tube 1 is rotatably mounted on the mounting seat 81, and the mounting seat is located on the right side of the drive sleeve. The cylinder of the electric push cylinder 8 The body is fixed on the mounting seat 81, the telescopic end of the electric push cylinder 8 is hinged to one end of the shift fork 82, the other end of the shift fork 82 is hinged to one end of the limit plate 83, and the other end of the limit plate 83 is fixedly connected to the mounting seat 81, and a drive shaft is rotatably mounted on the shift fork 82, and a roller is rotatably mounted on one end of the drive shaft, and the roller is inserted into the drive groove of the drive sleeve 84; in the step 3), the electric push cylinder 8 pushes the shift fork 82 so that the shift fork 82 is hinged around the hinge between it and the limit plate 83 The joint rotates, and the shift fork 82 pushes the drive sleeve 84 through the roller, and the drive sleeve 84 drives the outer push tube 3 to move, and the outer push tube 3 drives the inner push tube 2 to move through the linkage block 11. When the outer push tube 3 moves, it can push the outer walls of multiple outer clamps 5 at the same time, so that the multiple outer clamps 5 are buckled inward at the same time. When the inner push tube 2 moves, it can push the push rod 7, and the push rod 7 pushes the inner wall of the inner support body 6 to make the deformed end 68 of the inner support body 6 be stretched open, thereby completing the clamping from the inner and outer sides of the catheter 9 at the same time.

[0046] In order to make the device more flexible and more efficient, in this embodiment, the inner support body 6 is slidably mounted on the support tube 1; in the step 3), the deformed end 68 of the inner support body 6 and the push rod 7 are brought closer to each other during the process of fixing the catheter 9; in the step 4), the deformed end 68 of the inner support body 6 and the push rod 7 are moved away from each other during the process of loosening the catheter 9. This arrangement makes the clamping process of the catheter 9 faster. Further preferably, as Figure 2 、 Figure 4 、 Figure 6 、 Figure 7 、 Figure 8 and Figure 9 As shown, the left end of the support tube 1 is fixedly installed with a connecting sleeve 4, the inner push tube 2 and the push rod 7 can be extended into the connecting sleeve 4, the connecting sleeve 4 is located in the outer push tube 3, and a limiting sleeve 61 is provided in the connecting sleeve 4, the left end of the inner push tube 2 and the push rod 7 can be inserted into the limiting sleeve 61, the limiting sleeve 61 is internally threaded with a first positioning ring 62, and the first connecting end 67 of the inner support body 6 is inserted into the first positioning ring 62 and fits tightly, so that the relative position of the inner support body 6 and the support tube 1 can be adjusted by rotating the first positioning ring 62, and then the deployment timing of the inner support body 6 can be adjusted, so that the outer clamp 5 and the inner support body 6 can clamp the inner and outer sides of the catheter at the same time; the deformation end 68 of the inner support body 6 is positioned On the left side of the first positioning ring 62, a plurality of avoidance grooves 42 are provided on the connecting sleeve 4, and a spring 63 is provided in the avoidance groove 42. One leg of the spring 63 is connected to the connecting sleeve 4 by a pin, and the other leg of the spring 63 is connected to the limiting sleeve 61 by a pin; a plurality of first mounting portions 43 are raised at the left end of the connecting sleeve 4, and a second mounting portion 52 is raised at the right end of the outer clamp 5. The second mounting portion 52 of the outer clamp 5 is inserted between two adjacent first mounting portions 43 and is hinged by a hinge shaft; the right end of the second mounting portion 52 is an arc-shaped end 51 with a gradually changing radius, and under the action of the spring 63, the left end of the connecting sleeve 4 is always against the arc-shaped end 51 of the outer clamp 5; Figure 4 As shown, when the inner and outer sides of the fixed end of the catheter are clamped by the outer clamp 5 and the inner support body 6, the left end of the connecting sleeve 4 abuts against point A on the arc-shaped end 51 of the outer clamp 5, as shown in FIG. Figure 6As shown, when the multiple outer clamps 5 are opened outward and no catheter is clamped, the left end of the connecting sleeve 4 abuts against point B on the arc-shaped end 51 of the outer clamp 5. In this embodiment, the distance from point A to the axis of the hinge shaft is smaller than the distance from point B to the axis of the hinge shaft, and the radius of the part from point A to point B on the arc-shaped end 51 of the clamp 5 gradually increases, thereby gradually changing the radius of the arc-shaped section 51 of the clamp 5. In the step 3), when the external pushing tube 3 moves to the left to push the external clamp 5, the external clamp 5 rotates around the hinge position between it and the connecting sleeve 4. Since the end of the external clamp 5 that abuts against the connecting sleeve 4 is arc-shaped and has a gradual radius, when the external clamp 5 swings, the arc-shaped end of the external clamp 5 can push the limiting sleeve 61 to move to the right. In the process of moving to the right, the limiting sleeve 61 will not only stretch the spring 63, but also drive the inner support body 6 to move to the right, so that the inner support body 6 and the push rod 7 can move relative to each other, thereby improving the clamping efficiency of the catheter 9. In said step 4), when the electric push cylinder 8 drives the outer push tube 3 to move to the right away from the outer clamp 5, the outer push tube 3 drives the push rod 7 to be gradually withdrawn from the inner support body 6 through the linkage block 11 and the inner push tube 2. Since multiple outer clamps 5 lose the restriction of the outer push tube 3, the spring 63 can pull the limiting sleeve 61 to move to the left. The limiting sleeve 61 moves to the left. On the one hand, it can push the arc end of the outer clamp 5 to flip it away from the conduit 9 sleeved on the inner support body 6. On the other hand, the limiting sleeve 61 drives the inner support body 6 to move to the left, so that the inner support body and the push rod 7 move relative to each other, thereby releasing the conduit 9. Further preferably, as Figure 2 、 Figure 4 and Figure 6 As shown, the inner wall of the end of the push tube 3 close to the outer clamp 5 is a conical inner conical surface, as shown in FIG. Figure 8 As shown, the outer clamp 5 is provided with a curved surface 53 that matches the inner conical surface. In step 3), as the extension tube 3 moves, the curved surface of the outer clamp 5 gradually abuts against the inner conical surface of the extension tube 3, and the right ends of the multiple outer clamps 5 gradually insert into the inner conical surface of the extension tube 3. This arrangement allows the multiple outer clamps 5 to better cooperate with the extension tube 3, improving the smoothness of the catheter 9 during clamping, and enhancing the clamping accuracy and stability of the catheter 9.

[0047] In order to facilitate the installation of various components in this device, in this embodiment, Figure 2 、 Figure 4 、 Figure 6 and Figure 7The right end of the connecting sleeve 4 is a raised second connecting portion 41, and the left end of the support tube 1 is provided with a plurality of first connecting grooves 12. The inner hole of the support tube 1 is coaxial with the first connecting groove 12, and a first connecting portion with a thread is raised in the first connecting groove 12. The second connecting portion 41 of the connecting sleeve 4 is inserted into the first connecting groove 12 and is threadedly connected to the first connecting portion; in this embodiment, the inner hole of the connecting sleeve 4 includes a first connecting hole and a second connecting hole, and the first connecting hole is located in the second connecting portion 41. The inner diameter of the first connecting hole is smaller than the inner diameter of the second connecting hole, and the inner diameter of the first connecting hole matches the inner push tube 2. The limiting sleeve 61 is arranged in the second connecting hole, and the avoidance grooves 42 on the connecting sleeve 4 are all connected to the second connecting hole. In this embodiment, the end of the connecting sleeve 4 opposite to the second connecting part 41 is the clamping end, and a portion 44 is opened on the clamping end of the connecting sleeve 4. Multiple deformation holes 44 extend to the left through the clamping end, so that the clamping end of the connecting sleeve 4 and the deformation end 68 of the inner support body 6 have similar structures, both of which are in a blooming shape. Therefore, after the external push tube 3 is sleeved on the connecting sleeve 4, the external push tube 3 can correct the position of the connecting sleeve 4, ensure the coaxiality of multiple external clamps 5 and the inner support body 6, and ensure the roundness of the tube end of the catheter 9.

[0048] In this embodiment, Figure 2 、 Figure 4 and Figure 6 As shown, a rubber pad 54 is fixedly mounted on the outer clamp 5. The end surface of the rubber pad 54 that abuts the catheter 9 is a curved surface that matches the catheter 9. Part of the rubber pad protrudes from the outer clamp, and the curved surface of the rubber pad 54 is arranged on the protruding portion. This can reduce damage to the outer wall of the catheter 9 during the clamping process, ensure that the catheter 9 remains intact during the clamping process, and improve the stability of the catheter 9 clamping.

[0049] In this embodiment, Figure 9As shown, the inner support body 6 is cylindrical in the expanded state, and the outer diameter of the inner support body 6 matches the inner diameter of the catheter 9; the inner support body 6 is conical in the contracted state, so that it can better extend into the catheter 9. Further preferably, the inner wall of the inner support body 6 in the expanded state includes a first cylindrical connecting surface 64, a second conical connecting surface 65 and a third connecting surface 66, the first connecting surface 64 is located at the deformation end 68 of the inner support body 6, the second connecting surface 65 is located at the first connecting end 67, and the first connecting surface 64 and the second connecting surface 65 are connected by the third connecting surface 66; in the step 3), the push rod 7 pushes the third connecting surface 66 to expand the inner support body 6 in the contracted state, and the outer diameter of the inner support body 6 in the expanded state matches the inner diameter of the catheter, and the inner diameter of the first connecting surface 64 matches the outer diameter of the push rod 7. With this arrangement, when the push rod 7 extends into the inner side of the first connecting surface 64, the outer diameter of the inner support body 6 no longer changes, and the inner wall of the conduit 9 is supported by the cylindrical inner support body 6 rather than a single point support, thereby improving the support efficiency and stability of the inner support body 6.

[0050] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0051] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A method for fixing a catheter end, characterized in that: The invention comprises an inner support body (6), a push rod (7) and a plurality of outer clamps (5); one end of the inner support body (6) is a deformation end, and one end of the push rod (7) is inserted into the inner support body (6), and the push rod (7) can expand the deformation end of the inner support body (6) when moving in the axial direction; the plurality of outer clamps (5) are arranged around the inner support body (6); the specific steps of fixing the catheter tube end are as follows: Step 1) the plurality of outer clamps (5) are simultaneously expanded outward, and the inner support body (6) is in a contracted state; Step 2) putting the fixed end of the catheter onto the deformed end of the inner support body (6); Step 3) Simultaneously drive the push rod (7) and the plurality of outer clamps (5), the push rod (7) pushes the inner wall of the inner support body (6) to expand the deformed end of the inner support body (6), and the plurality of outer clamps (5) approach the outer wall of the catheter, thereby enabling the inner support body (6) and the plurality of outer clamps (5) to simultaneously complete the clamping of the fixed end of the catheter from both the inner and outer sides, at which time the deformed end of the inner support body (6) is located on the inner side of the outer clamp (5); Step 4) When removing the catheter, the driving rod (7) and the plurality of outer clamps (5) are reset to restore the inner support body (6) to a contracted state, and the plurality of outer clamps (5) are simultaneously expanded outward, and then the catheter is removed from the inner support body (6); It also includes a support tube (1), an inner push tube (2), an outer push tube (3) and a driving member, wherein the inner push tube (2) is inserted into the support tube (1), the outer push tube (3) is sleeved on the support tube (1), the inner support body (6) is installed on the support tube (1), the push rod (7) is fixed to one end of the inner push tube (2), one end of the outer clamp (5) is hinged to the support tube (1), and the driving member is installed on the support tube (1) and can drive the outer push tube (3) and the inner push tube (2) to move simultaneously; in the step 3), the driving member drives the outer push tube (3) and the inner push tube (2) to move, the inner push tube (2) drives the push rod (7) to move, so that the push rod (7) drives the deformation end of the inner support body (6) to open outward, and the outer push tube (3) drives multiple outer clamps (5) to move at the same time, so that the multiple outer clamps (5) abut against the outer wall of the catheter at the same time; One end of the outer chuck (5) is an arc-shaped end, and the inner support body (6) is installed on the limiting sleeve (61). The limiting sleeve (61) is slidably connected to the support tube (1), and one end of the limiting sleeve (61) is against the arc-shaped end of the outer chuck (5). One end of the spring (63) is connected to the support tube (1), and the other end of the spring (63) is connected to the limiting sleeve (61); in the step 3), when the outer push tube (3) drives the outer chuck (5) to swing, the arc-shaped end of the outer chuck (5) pushes the limiting sleeve (61) toward the inner push tube (2) Near the end, the spring (63) is stretched, and the limiting sleeve (61) drives the inner support body (6) to move toward the inner push tube (2), so that the inner support body (6) and the push rod (7) move relative to each other; in the step 4), when the outer push tube (3) is away from the outer clamp (5), the spring (63) pulls the limiting sleeve (61) to push the arc-shaped end of the outer clamp (5), so that the multiple outer clamps (5) are simultaneously opened outward away from the catheter, and the spring (63) pulls the inner support body (6) away from the inner push tube (2) through the limiting sleeve (61), so that the inner support body (6) and the push rod (7) move relative to each other.

2. A catheter end fixing method according to claim 1, characterized in that: The driving member comprises an electric push cylinder (8), which is mounted on a support tube (1), wherein a telescopic end of the electric push cylinder (8) is connected to an outer push tube (3), and an inner push tube (2) is fixedly connected to the outer push tube (3) via a linkage block (11); in step 3), the electric push cylinder (8) drives the inner push tube (2) and the outer push tube (3) to move the same distance at the same time via the linkage block (11), so that the inner and outer sides of the catheter are fixed at the same time.

3. A catheter end fixing method according to claim 1, characterized in that: An inner conical surface is provided at one end of the outer chuck (5) close to the outer chuck (5), and an arc surface matching the inner conical surface is provided on the outer chuck (5); in step 3), when the outer chuck (3) moves, the arc surface of the outer chuck (5) gradually abuts against the inner conical surface of the outer chuck (3), and the plurality of outer chucks (5) are gradually inserted into the outer chuck (3).

4. A catheter end fixing method according to claim 1, characterized in that: A rubber pad is fixedly mounted on the outer clamp (5).

5. The method for fixing a catheter end according to claim 1, wherein: The inner support body (6) is cylindrical in the expanded state, and is conical in the contracted state.

6. A catheter end fixing method according to claim 5, characterized in that: The inner wall of the inner support body (6) in the expanded state includes a first cylindrical connecting surface (64), a second conical connecting surface (65) and a third connecting surface (66), the first connecting surface (64) and the second connecting surface (65) are connected through the third connecting surface (66), the first connecting surface (64) is located at the deformation end of the inner support body (6), and the second connecting surface (65) is located at the first connecting end (67) opposite to the deformation end; in the step 3), the push rod (7) pushes the third connecting surface (66) to expand the inner support body (6) in the contracted state, the outer diameter of the inner support body (6) in the expanded state matches the inner diameter of the catheter, and the inner diameter of the first connecting surface (64) matches the outer diameter of the push rod (7); in the step 4), after the push rod withdraws from the first connecting surface and the third connecting surface, the inner support body (6) returns to the contracted state.

7. A catheter end fixing device, characterized in that: The catheter tube end fixing method according to any one of claims 1 to 6 is applied.

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