Preparation device for polytetrafluoroethylene two-color spiral tube blank

Abstract

The present invention provides a device for preparing polytetrafluoroethylene two-color spiral tube blanks. Mixtures of different colors are added to the preparation device and extruded to prepare semi-circular ring column blanks of different colors. Two semi-circular ring column blanks of different colors are combined to obtain polytetrafluoroethylene two-color spiral tube blanks, namely two-color tube blanks. The device comprises a cylinder body, a partition, and a blocking plate. The cylinder body is a semi-circular ring column, the side plane of the semi-circular ring column cylinder body is in contact with the inner surface of the partition, and arc-shaped flanges extending parallel to the axis of the cylinder body are provided on both sides of the partition. The arc-shaped flanges are in contact with the arc surface of the cylinder body. A semi-cylinder coaxial with the cylinder body is provided on the inner surface of the partition. A blocking plate is provided at one end in the axial direction of the cylinder body and the partition to seal one end of the internal space surrounded by the inner surface of the cylinder body, the inner surface of the partition, and the outer arc surface of the semi-cylinder.

Description

Technical Field

[0001] The invention relates to a device for preparing a polytetrafluoroethylene two-color spiral tube blank, and more particularly to a detachable cylinder for preparing a medical polytetrafluoroethylene two-color spiral tube. Background Art

[0002] Polytetrafluoroethylene (PTFE) is a high-performance thermoplastic (also known as F4). It is widely used in medical heat shrink tubing due to its high temperature resistance, chemical solvent resistance, stable chemical properties, biocompatibility, non-stickiness, wide long-term use temperature range, and self-cleaning properties.

[0003] In recent years, interventional medicine, unlike traditional internal medicine and surgery, has gained widespread use. Physicians in interventional medicine rely on medical imaging equipment such as CT, MRI, and ultrasound to guide them through the lesions using specialized instruments such as catheters and guidewires. These instruments offer advantages such as minimal incision, high precision, and a wide range of indications. As a modern medical device, endoscopes are inserted through various natural cavities and minimally invasive procedures. Endoscope images are acquired through connection to imaging equipment or direct visual observation. Endoscopes are primarily used in areas such as the digestive system, urinary system, respiratory system, and gynecology. However, in interventional medicine, the time and scope of visualization are limited, making it difficult for attending physicians to accurately locate and quickly navigate internal tissues using cavities or other reference points. To address this issue, researchers and manufacturers have made numerous improvements to medical catheters, such as considering directly coating them. However, this approach makes it difficult to achieve long-term colorfastness and sustained color strength.

[0004] If the surface of a medical catheter has spiral stripes of two colors alternating with a certain pitch (i.e., a two-color spiral tube), it can be used in conjunction with an endoscope or other equipment to facilitate doctors' precise positioning and navigation of internal tissues.

[0005] In the prior art, polytetrafluoroethylene (PTFE) tubes are typically formed by extrusion followed by subsequent sintering and other processes. In the extrusion device, a cylinder is fixed to the extrusion frame. The extrusion port at the lower end of the cylinder communicates with the die cavity of the extrusion die. A core rod, immovable relative to the cylinder (for example, its lower end is fixed to the extrusion die), extends upward through the cylinder and passes through a piston and piston rod. The lower end of the piston rod is fixedly connected to the piston, while the upper end extends into the extrusion cylinder. The movement of the extrusion cylinder drives the piston rod up and down, allowing the piston to move in and out of the cylinder along the core rod.

[0006] During operation, the extrusion oil cylinder first drives the piston rod and the piston to move upward. The piston comes out of the upper port of the cylinder barrel, and then the mixture containing polytetrafluoroethylene is added into the cylinder barrel from the upper port of the cylinder barrel. Then, the extrusion oil cylinder first drives the piston rod and the piston to move downward. The piston enters the cylinder barrel and moves downward along the core rod to extrude the mixture, and the mixture is extruded out of the lower port of the cylinder barrel and enters the cavity of the extrusion die. After passing through the cavity of the extrusion die, a prefabricated pipe is formed. The cylinder barrels used in the pre-pressing and forming process mostly adopt single-chamber cylinder barrels, which cannot be disassembled, and only pipe blanks of one color can be pressed in this cylinder barrel. The monochromatic blanks can only produce polytetrafluoroethylene pipes of one color, which has certain limitations.

[0007] To prepare a polytetrafluoroethylene double-color spiral pipe, the prerequisite is to form a double-color pipe blank in the cylinder barrel, and then extrude the double-color pipe blank to obtain a double-color prefabricated pipe, and then perform subsequent other processes to obtain a double-color spiral pipe. Using the existing polytetrafluoroethylene pipe extrusion device, it is obvious that a double-color pipe blank cannot be prepared, nor can a double-color prefabricated pipe be extruded. Summary of the Invention

[0008] In view of the above technical problems in the prior art, the object of the present invention is to provide a device for preparing a polytetrafluoroethylene double-color spiral pipe blank. By adding mixtures of different colors into this preparation device and extruding them, semi-annular columnar pipe blanks of different colors can be prepared. The combination of two semi-annular columnar pipe blanks of different colors can obtain a polytetrafluoroethylene double-color spiral pipe blank, that is, a double-color pipe blank.

[0009] The device for preparing a polytetrafluoroethylene double-color spiral pipe blank described in the present invention includes a cylinder barrel body, a partition plate, and a plug plate; the cylinder barrel body is a semi-annular column. The side plane of the semi-annular column cylinder barrel body is fitted with the inner surface of the partition plate. Arc-shaped flanges extending parallel to the axis of the cylinder barrel body are provided on both sides of the partition plate, and the arc-shaped flanges are fitted with the arc surface of the cylinder barrel body. A semi-cylinder coaxial with the cylinder barrel body is provided on the inner surface of the partition plate. A plug plate is provided at one end in the axial direction of the cylinder barrel body and the partition plate to block one end port of the internal space surrounded by the inner surface of the cylinder barrel body, the inner surface of the partition plate, and the outer arc surface of the semi-cylinder.

[0010] In the above preparation device, the plug plate is a semi-circular plate that contacts the end face of the cylinder barrel body, the end face of the semi-cylinder, and the end face of the partition plate.

[0011] In the above preparation device, a pressure block is provided at the other end in the axial direction of the cylinder barrel body and the partition plate. The pressure block is used to block the other end port of the internal space, and the pressure block can move along the axial direction of the cylinder barrel body under the action of an external force to compress the mixture located in the internal space.

[0012] For the above-mentioned preparation device, there are two cylinder barrel bodies, partitions, and plug plates. When the side plane of cylinder barrel body A is fitted with the side plane of cylinder barrel body B, a circular column cylinder is formed; it further includes a detachable connection mechanism for connecting cylinder barrel body A and cylinder barrel body B that form the circular column cylinder together and can be detached from the circular column cylinder.

[0013] For the above-mentioned preparation device, the detachable connection mechanism is a screw, and the screw passes through the screw hole on cylinder barrel body A and is threadedly connected to the screw hole on cylinder barrel body B.

[0014] For the above-mentioned preparation device, cylinder barrel body A and cylinder barrel body B are connected by a nut and a bolt passing through the bolt holes on the two cylinder barrel bodies.

[0015] For the above-mentioned preparation device, a clamping groove A is formed on the outer surface of cylinder barrel body A, and a clamping groove B is formed on the outer surface of cylinder barrel body B. The transition connection half-ring A has a clamping portion A extending into the clamping groove A, and the transition connection half-ring B has a clamping portion B extending into the clamping groove B; the transition connection half-ring A and the transition connection half-ring B are connected in a detachable manner, and the transition connection half-ring A and the transition connection half-ring B have through holes for passing screws.

[0016] For the above-mentioned preparation device, the diameter of the cylinder is 30 - 120 mm and can be adjusted as needed.

[0017] For the above-mentioned preparation device, there are two partitions with thicknesses of 1 - 2 mm respectively;

[0018] For the above-mentioned preparation device, a total of 6 screw holes are provided on the cylinder barrel body and are distributed staggeredly.

[0019] For the above-mentioned preparation device, the transition connection half-ring is provided with two screw holes.

[0020] For the above-mentioned preparation device, the material of the cylinder barrel body is stainless steel.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. The present patent proposes a preparation device for a polytetrafluoroethylene two-color spiral tube blank, which includes a cylinder barrel body, a partition, a plug plate, etc. Flanges that can be fitted with partial arc surfaces of the cylinder barrel body are provided on both sides of the partition, and a convex semi-cylindrical structure is in the middle of the partition. The flanges can ensure that the partition will not separate from the cylinder barrel body when pre-pressing the mixture, and at the same time, the flanges will not affect the axial movement of the partition relative to the cylinder barrel body, facilitating the removal of the partition. The plug plate is a semi-circular plate with a simple structure and is more convenient to use. A pressing block is used to facilitate the pre-pressing of the mixture.

[0023] The semi-circular cylindrical tube blank can be prepared by using this preparation device. The semi-circular cylindrical tube blank is taken off from the preparation device, and two semi-circular cylindrical tube blanks of different colors are surrounded and butted to obtain a double-color tube blank.

[0024] When two preparation devices are used, only the partition plate, the plug plate, etc. need to be separated from the cylinder body, and there is no need to separate the semi-circular cylindrical tube blank from the cylinder body. The two cylinder bodies are butted into one cylinder, and at the same time, the two semi-circular cylindrical tube blanks are butted into a double-color circular cylindrical tube blank. The cylinder is connected to the frame in a detachable manner, and then the extrusion oil cylinder can be used to perform extrusion operations on the double-color tube blank, greatly improving the operation efficiency.

[0025] The transition connecting semi-ring A and the transition connecting semi-ring B that are butted by surrounding are used to form a transition connecting ring. The transition connecting ring is detachably connected to the frame, further improving the efficiency of connecting the cylinder to the frame. The connection between the transition connecting semi-ring A and the transition connecting semi-ring B also prevents the separation of the two cylinder bodies.

[0026] 2. This preparation device is easy to clean, clean and hygienic, simple and efficient, can pre-press a double-color tube blank with uniform color, and the junction of the double-color tube blank is basically parallel to the axis of the tube blank. Brief Description of the Drawings

[0027] Figure 1 、 2 They are respectively the three-dimensional views of the cylinder body;

[0028] Figure 3 、 4 They are respectively the three-dimensional views of the partition plate;

[0029] Figure 5 It is a schematic diagram when the partition plate, the cylinder body, the pressing block, etc. are assembled;

[0030] Figure 6 It is for Figure 5 the D-D sectional view of;

[0031] Figure 7 It is for Figure 5 the E-E sectional view of;

[0032] Figure 8 、 9 They are respectively the three-dimensional views of the cylinder body connected to the extrusion device;

[0033] Figure 10 [[ID=]49]It is the front view of the cylinder body and the like of Embodiment 1 connected to the extrusion device;

[0034] Figure 11 It is for Figure 10 the A-A sectional view of;

[0035] Figure 12 It is for Figure 10 the left view of;

[0036] Figure 13 for Figure 10 CC cross-sectional view;

[0037] Figure 14 、 15 They are three-dimensional diagrams of the cylinder body and the like connected to the extrusion device of Example 2;

[0038] Figure 16 、 17 18 are three-dimensional diagrams of the retaining sleeve.

[0039] Description of reference numerals:

[0040] Cylinder body 1, partition 2, flange 21, semi-cylinder 22, blocking plate 3, pressure block 4, transition connection half ring 5, screw 6

[0041] Cylinder body A11, cylinder body B12, cylinder 13, side plane 14, screw hole 15, screw hole 16

[0042] Transition connection half ring A51, transition connection half ring B52, transition connection ring 53, clamping part A55, clamping part B56, transition connection screw 59

[0043] Slot A71, slot B72, semi-circular ring column tube blank A81, semi-circular ring column tube blank B82

[0044] Block sleeve 9, intermediate body 92, front end plate 91, rear block ring 93, semi-ring groove A95, semi-ring groove B96, ring groove 97, annular column block 99,

[0045] Extrusion device 100, core rod 200, piston 300, frame 400, cylinder 500 DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Example

[0047] Reference Figures 5 - 8 The preparation device of the polytetrafluoroethylene two-color spiral tube blank includes a cylinder body 1, a partition plate 2, a blocking plate 3, a pressing block 4, a transition connection half ring 5, a screw 6, etc. The cylinder body 1, the partition plate 2, the blocking plate 3, the pressing block 4, and the transition connection half ring 5 are two in number and have basically the same structure.

[0048] The two cylinder bodies 1 are cylinder body A11 and cylinder body B12, and the two transition connection half rings 5 are transition connection half ring A51 and transition connection half ring B52.

[0049] See also Figures 1 - 4, the cylinder block body 1 is a semi - circular cylinder. The side plane 14 of the semi - circular cylinder block body is in contact with the inner surface of the partition plate 2. Arc - shaped flanges 21 extending parallel to the axis of the cylinder block body are provided on both sides of the partition plate. The arc - shaped flanges 21 are in contact with a part of the arc surface of the cylinder block body. A semi - cylinder 22 coaxial with the cylinder block body is provided on the inner surface of the partition plate. A plug plate 3 is provided at one end in the axial direction of the cylinder block body and the partition plate. The plug plate 3 is a semi - circular plate that contacts the end face of the cylinder block body, the end face of the semi - cylinder, and the end face of the partition plate. The plug plate 3 is fixed at one end of the partition plate 2 and is used to block one end port of the internal space surrounded by the inner surface of the cylinder block body, the inner surface of the partition plate, and the outer arc surface of the semi - cylinder.

[0050] A pressure block 4 is provided at the other end in the axial direction of the cylinder block body and the partition plate. The pressure block is used to block the other end port of the internal space. The pressure block 4 can move along the axial direction of the cylinder block body under the action of an external force to compress the mixture including polytetrafluoroethylene located in the internal space.

[0051] When the side plane of the cylinder block body A11 is in contact with the side plane of the cylinder block body B12, a circular - cylinder cylinder 13 can be formed.

[0052] A plurality of counter - sunk screw holes 15 and a plurality of through - hole screw holes 16 are provided on the side planes 14 of the two cylinder block bodies. The screw holes 15 on one cylinder block body and the screw holes 16 on the other cylinder block body are opposite. The screw 6 passes through the screw hole on one cylinder block body and is threadedly connected to the screw hole on the other cylinder block body, detachably connecting the two cylinder block bodies that form the cylinder together.

[0053] A clamping groove A71 is provided on the outer surface of one end of the cylinder block body A11, and a clamping groove B72 is provided on the outer surface of one end of the cylinder block body B. The transition connecting half - ring A51 has a clamping portion A55 extending into the clamping groove A, and the transition connecting half - ring B52 has a clamping portion B56 extending into the clamping groove B. The detachable connection method between the transition connecting half - ring A and the transition connecting half - ring B is similar to that between the two cylinder block bodies and will not be elaborated here.

[0054] A half - ring groove A95 is provided on the outer surface of the other end of the cylinder block body A, and a half - ring groove B96 is provided on the outer surface of the other end of the cylinder block body B. When the cylinder block body A and the cylinder block body B are butted to form a cylinder, the half - ring groove A and the half - ring groove B form a ring groove 97 on the cylinder;

[0055] Through - holes for passing screws are provided on the transition connecting half - ring A and the transition connecting half - ring B.

[0056] The method for extruding a tube blank when preparing a polytetrafluoroethylene two - color spiral tube includes the following steps:

[0057] See Figures 5 - 7 and Figure 13, preparing the semi - circular cylindrical tube blank A81: Insert the cylinder body A11 axially into the partition plate 2 until the plug plate 3 seals the port at one end of the internal space enclosed by the inner surface of the cylinder body A, the inner surface of the partition plate, and the outer arc surface of the semi - cylinder. The mixture A containing polytetrafluoroethylene and color paste A is added into the internal space; Use auxiliary tools or pressing blocks, etc. to apply a certain pressure to the mixture, so that the mixture A in the internal space is shaped into the semi - circular cylindrical tube blank A81, and then remove the auxiliary tools or pressing blocks. Pull the partition plate along the axis to separate the partition plate from the cylinder body A11, and obtain the cylinder body A11 containing the semi - circular cylindrical tube blank A81 inside.

[0058] Using a similar method above, the mixture B containing polytetrafluoroethylene and color paste B is added into the internal space enclosed by the inner surface of the cylinder body B, the inner surface of another partition plate, and the outer arc surface of the semi - cylinder, and the cylinder body B12 containing the semi - circular cylindrical tube blank B82 inside is prepared.

[0059] See Figures 8 - 13 , the cylinder body A containing the semi - circular cylindrical tube blank A and the cylinder body B containing the semi - circular cylindrical tube blank B are surrounded and butt - jointed. The cylinder body A and the cylinder body B are butt - jointed to form a cylinder, and the semi - circular cylindrical tube blank A and the semi - circular cylindrical tube blank B are butt - jointed to form a circular cylindrical double - color tube blank. When surrounded and butt - jointed, the core rod 200 in the extrusion device 100 passes through the center of the circular cylindrical tube blank. Use screws 6 to connect the cylinder body A and the cylinder body B together.

[0060] The clamping part A55 on the transition connecting semi - ring A51 extends into the clamping groove A71, the clamping part B56 on the transition connecting semi - ring B52 extends into the clamping groove B72, use screws 6 to connect the transition connecting semi - ring A and the transition connecting semi - ring B, and the transition connecting semi - ring A and the transition connecting semi - ring B are connected to the frame 400 of the extrusion device by the transition connecting screw 59 passing through the through - hole. The piston 300 in the extrusion device is slidably arranged on the core rod 200, and the piston matches the cylinder.

[0061] The oil cylinder 500 in the extrusion device acts, and the piston 400 moves along the core rod in the cylinder, and extrudes the double - color tube blank out of the cylinder.

[0062] The diameter (inner diameter) of the cylinder is 30 mm, and the thickness of the partition plate 2 is 1.5 m; There are 6 screw holes on each cylinder body, which are staggered. The material of the cylinder body is stainless steel. Example

[0063] The main difference between Example 2 and Example 1 is: See Figures 14 - 15 , Example 2 further includes a circular cylindrical stopper 99 formed by surrounding and butt - jointing two semi - circular cylindrical stoppers and a retaining sleeve 9 detachably connected to the cylinder. See Figures 16 - 18, the retaining sleeve 9 includes a front end plate 91, a rear retaining ring 93, and an intermediate body 92 connecting the front end plate and the rear retaining ring; openings extending in the radial direction of the retaining sleeve are provided on the front end plate, the rear retaining ring, and the intermediate body. The width of the opening on the front end plate 91 is the same as the outer diameter of the core rod 200, the width of the opening on the rear retaining ring 93 is the same as the outer diameter of the ring groove 97, and the width of the opening on the intermediate body 92 is the same as the outer diameter of the cylinder barrel.

[0064] During use, first clean the two partition plates 2 and the pressing block 4, disassemble the cylinder barrel in the assembled state, assemble the partition plate 2 and the cylinder barrel body part of the oil cylinder in sequence, add the mixture of color A, install the pressing block, and then apply a certain pressure with an auxiliary tool to make the internal mixture take shape. Remove the partition plate and the pressing block, and the material does not loosen, obtaining a barrel body with semi-compacted material. Then, using the same method as above, obtain a barrel body with semi-compacted material of another color. Fix the barrel bodies containing the semi-compacted materials of the two colors together with screws, and fix the transition connecting semi-ring 5 to the frame with two screws, and install the screw rod in the middle.

[0065] See Figures 14 - 15 , refer to Figures 8 - 13 , insert two semi-cylindrical retaining blocks into the extrusion port of the cylinder barrel 13 away from the piston, and the two semi-cylindrical retaining blocks surround the core rod 200 to form a cylindrical retaining block 99; insert the retaining sleeve 9 into the cylinder barrel 13 along the radial direction, with the front end plate 91 located at the end face of the extrusion end of the cylinder barrel, and the rear retaining ring 93 extending into the ring groove 97 on the cylinder barrel; start the hydraulic cylinder, and the piston moves along the core rod in the cylinder barrel to extrude the tube blank towards the retaining block direction, obtaining a further compacted tube blank; the two-color tube blank has a uniform color, and the boundary between the two colors is basically parallel to the axis, providing a basis for preparing a two-color spiral heat shrinkable tube with a uniform color in the later stage. Then remove the retaining sleeve 9 from the cylinder barrel 13 and take out the retaining block.

[0066] Connect the extrusion die to the extrusion end of the cylinder barrel, start the hydraulic cylinder, and the piston moves along the core rod in the cylinder barrel to extrude the tube blank from the cylinder barrel into the die cavity of the extrusion die for the subsequent preparation process of the polytetrafluoroethylene two-color spiral tube.

[0067] The above embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, any number of deformations and improvements belong to the protection scope of the present application.

Claims

1. A device for preparing polytetrafluoroethylene two-color spiral tube blanks, characterized by: It includes a cylinder body, a partition, and a blocking plate; the cylinder body is a semi-circular ring column, the side plane of the semi-circular ring column cylinder body is in contact with the inner surface of the partition, and arc-shaped flanges extending parallel to the axis of the cylinder body are provided on both sides of the partition, and the arc-shaped flanges are in contact with the arc surface of the cylinder body. The inner surface of the partition has a semi-cylinder coaxial with the cylinder body, and a blocking plate is provided at one end in the axial direction of the cylinder body and the partition to block one end port of the internal space enclosed by the inner surface of the cylinder body, the inner surface of the partition, and the outer arc surface of the semi-cylinder; The blocking plate is a semicircular plate in contact with the end face of the cylinder body, the end face of the semi-cylinder and the end face of the partition; Two cylinder bodies, two partitions and two blocking plates are provided. The two cylinder bodies are cylinder body A and cylinder body B. When the side plane of cylinder body A is fitted with the side plane of cylinder body B, a circular cylindrical cylinder is formed.

2. The preparation device according to claim 1, characterized in that: A pressure block is provided at the other end of the axis direction of the cylinder body and the partition, and is used to seal the other end port of the internal space. The pressure block can move along the axis direction of the cylinder body under the action of external force to compress the mixture in the internal space.

3. The preparation device according to claim 1, characterized in that: It also includes a detachable connecting mechanism for connecting the cylinder body A and the cylinder body B that constitute the circular ring column cylinder and which can be removed from the circular ring column cylinder.

4. The preparation device according to claim 3, characterized in that: The detachable connection mechanism is a screw, which passes through a screw hole on the cylinder body A and is threadedly connected to a screw hole on the cylinder body B.

5. The preparation device according to claim 3, characterized in that: Cylinder body A is connected to cylinder body B by nuts and bolts passing through bolt holes on the two cylinder bodies.

6. The preparation device according to claim 3, characterized in that: A card groove A is opened on the outer surface of the cylinder body A, and a card groove B is opened on the outer surface of the cylinder body B. The transition connection half ring A has a card connection portion A extending into the card groove A, and the transition connection half ring B has a card connection portion B extending into the card groove B; the transition connection half ring A and the transition connection half ring B are connected in a detachable manner, and the transition connection half ring A and the transition connection half ring B have through holes for passing screws.

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