Shaping device for processing sleeve tip

Abstract

The embodiment of the utility model provides a shaping device for processing the tip of a sleeve. The shaping device comprises: a first portion for surrounding a portion of the cannula; the second part is connected with the first part and is used for molding the tail end of one part of the sleeve into a sleeve tip; wherein the first part is made of an insulating material, and the second part is made of a metal material. When the shaping device is used for machining the tip end of the cannula, the cannula is effectively prevented from wrinkling when the tip end of the cannula is machined, so that the situation that the cannula is bent and is difficult to enter a blood vessel is avoided, and the high puncture success rate of a catheter needle is ensured.

Description

Technical Field

[0001] The utility model relates to a shaping device for processing a cannula tip, for example, for processing a cannula tip of a cannula of an angiography catheter needle. Background Art

[0002] The cannula is a catheter used to be inserted into the human blood vessels to establish an infusion channel. The top of the cannula has a cannula tip that is approximately conical, which is convenient for inserting into the human blood vessels. The cannula tip processing step is that the cannula is subjected to a certain downward pressure, and at the same time, the temperature of the shaping block outside the cannula is increased by electromagnetic induction, and the top of the cannula is shaped into a cannula tip that is approximately conical by the shaping block, which is conducive to the cannula entering the human vein.

[0003] Conventional shaping blocks are usually made of a single metal (such as SKD61), which is a conductor. The principle is high-frequency induction heating, which transmits high-frequency alternating current to the induction coil (or annular copper plate), generating a strong magnetic flux with instantaneous polarity change in the coil. The metal shaping block is placed in the coil (or annular copper plate), and the magnetic flux penetrates the shaping block, generating a strong eddy current in the opposite direction of the heating current. Due to the resistance of the metal, Joule heat is generated inside the metal, and the temperature of the shaping block rises rapidly. The top of the sleeve is deformed under the action of heat, thus forming a sleeve tip that is approximately conical. However, when processing the tip of the thin-walled sleeve, it is affected by heat on the one hand and pressure on the other hand, causing wrinkles on the outside of the sleeve. This wrinkle will prevent the tip of the sleeve from entering the human blood vessel along the needle hole formed by the puncture of the steel needle, thereby causing puncture failure, so it is urgent to eliminate the wrinkles generated by the processing of the tip of the thin-walled sleeve. Utility Model Content

[0004] In order to solve the technical problems existing in the prior art, an embodiment of the utility model provides a shaping device for processing the tip of the cannula, which can prevent the cannula from generating wrinkles when processing the tip of the cannula, thereby preventing the cannula from bending due to wrinkles, making it difficult to enter the blood vessel and causing puncture failure.

[0005] According to an embodiment of the utility model, a shaping device for processing a cannula tip is provided. The shaping device comprises: a first part, used to surround a part of the cannula; and a second part, connected to the first part, used to shape the end of the part of the cannula into a cannula tip; wherein the first part is made of insulating material, and the second part is made of metal material.

[0006] Optionally, the first portion has a first cylindrical inner cavity, and the second portion has a frustoconical inner cavity and a second cylindrical inner cavity communicating with the first cylindrical inner cavity.

[0007] Optionally, the first part is made of ceramic or glass.

[0008] Optionally, the second part is made of SKD51, SKD61 or NAK80.

[0009] Optionally, the first part and the second part are connected to each other by bonding, welding or screwing.

[0010] Optionally, the outer side of the first part is wrapped with an electromagnetic shielding mesh.

[0011] Optionally, the electromagnetic shielding mesh is made of tin foil or copper foil.

[0012] Optionally, the outer side of the first part is coated with electromagnetic shielding paint.

[0013] Optionally, the height of the cannula tip of the cannula is 1 mm-4 mm.

[0014] Optionally, the outer diameter of the first end of the cannula tip is 0.6 mm-2.0 mm, and the outer diameter of the second end of the cannula tip is 0.3 mm-1.5 mm.

[0015] In an embodiment of the present invention, the first part of the shaping device is used to surround a part of the sleeve, and the second part is used to form the end of the part of the sleeve into a sleeve tip. The first part is made of insulating material, and the second part is made of metal material.

[0016] Compared with the existing shaping blocks made entirely of metal materials, the shaping device of the embodiment of the utility model can effectively prevent other parts of the cannula from being heated and wrinkled when processing the tip of the cannula, thereby preventing the cannula from bending due to wrinkles, making it difficult to enter the blood vessel and causing puncture failure.

[0017] The shaping device according to the embodiment of the utility model is suitable for processing the cannula tip of angiography catheter needle, and is also suitable for processing the cannula tips of various types of other catheter needles, such as intravenous indwelling needles, pressure-resistant indwelling needles, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features and advantages of the present invention will be better understood through the optional embodiments described in detail below in conjunction with the accompanying drawings, in which the same reference numerals represent the same or similar components, wherein:

[0019] Figure 1 A schematic structural diagram of a shaping device according to an embodiment of the utility model is shown;

[0020] Figure 2 A schematic structural diagram of a shaping device according to another embodiment of the utility model is shown; and

[0021] Figure 3-Figure 4A schematic diagram showing the use of a shaping device according to an embodiment of the present utility model to process a cannula tip. DETAILED DESCRIPTION

[0022] The implementation and use of the embodiments are discussed in detail below. However, it should be understood that the specific embodiments discussed are merely exemplary of specific ways to implement and use the present invention, and are not intended to limit the scope of the present invention. When describing the structural positions of the various components, such as up, down, top, bottom, etc., the expressions of directions are not absolute, but relative. When the various components are arranged as shown in the figure, these directional expressions are appropriate, but when the positions of the various components in the figure change, these directional expressions also change accordingly.

[0023] The use of peripheral intravenous infusion of contrast agents is a method for rapid clinical diagnosis, and the preferred tool is a contrast catheter needle. Compared with ordinary pressure-resistant indwelling needles, the contrast catheter needle has an obvious advantage in large flow rate. It can obtain more outlet flow at the same injection speed, which will increase the density of the bolus formed by the contrast agent in the human veins. As the contrast agent continues to be infused, it pushes the bolus in front to flow in the human blood vessels. Clear diagnostic images can be obtained through CT and magnetic resonance imaging, helping doctors to find hidden lesions that cannot be found during ordinary intravenous indwelling needle infusion, thereby obtaining more timely treatment plans.

[0024] For cancer patients, treatments such as chemotherapy drugs cause blood vessels to become fragile. When contrast agents are injected peripherally, the jet at the cannula outlet needs to be gentle to reduce the impact on the inner wall of the blood vessel. It is necessary to increase the contrast agent flow rate at the cannula outlet and slow down the flow rate at the outlet. According to the volume flow formula Q=SV (Q is the volume flow rate, S is the area of ​​the cross section, and V is the outlet fluid velocity), it is calculated that the larger S is, the smaller V is, and S is proportional to the square of the radius. When injecting contrast agents, the contrast catheter indwelling needle is usually connected to a dedicated "power injector" to implement push injection at a specified flow rate. Therefore, increasing the radius of the catheter cross section of the contrast catheter indwelling needle can reduce the fluid velocity at the cannula outlet to achieve the purpose of reducing the impact on the patient's blood vessels, thereby better protecting the patient's blood vessels. One of the differences between the contrast catheter needle and the ordinary pressure-resistant indwelling needle is that when the outer diameter of the cannula of the two is the same, the inner diameter of the cannula of the contrast catheter needle is larger, which results in a thinner wall thickness of its cannula.

[0025] The process of processing the tip of the cannula is that the cannula is subjected to a certain downward pressure, and at the same time, the temperature of the shaping block outside the cannula is increased by electromagnetic induction, and the top of the cannula is shaped into a cone by the shaping block, which is conducive to the cannula entering the human vein. The tip processing of the cannula is achieved by the shaping block. The conventional shaping block is usually made of a single material metal (such as SKD61), which is a conductor. Its principle is high-frequency induction heating, which transmits high-frequency alternating current to the induction coil (or annular copper plate), and generates a strong magnetic flux with instantaneous polarity change in the coil. The metal shaping block is placed in the coil (or annular copper plate). The magnetic flux penetrates the shaping block, and a strong eddy current is generated in the opposite direction of the heating current. Due to the resistance of the metal, Joule heat is generated inside the metal, and the temperature of the shaping block rises rapidly. The top of the cannula is deformed under the action of heat, thereby forming a cannula tip that is approximately conical. However, when processing the tip of the cannula with a thinner wall, it is affected by heat on the one hand and pressure on the other hand, causing wrinkles on the outside of the cannula. Such wrinkles will block the tip of the cannula from entering the human blood vessel along the needle hole formed by the puncture of the steel needle, thus causing puncture failure. Therefore, it is urgent to eliminate the wrinkles generated by the processing of the tip of the thin-walled cannula.

[0026] The material of the casing is usually made of amorphous material. Amorphous materials have three physical states, namely glass state, highly elastic state, and viscous flow state. When the temperature is below the glass transition temperature, the molecular chains and segments inside the material cannot move, and the amorphous part inside the material is in a frozen state. The material in the glass state is non-viscous and inelastic, and is a rigid solid, similar to glass. When the temperature continues to rise and reaches the glass transition temperature, the segments inside the material begin to move, and the molecular chains still cannot move. This state is called the highly elastic state of the material, and the material is in a thawed state. The material in the highly elastic state shows high elasticity and the deformation increases significantly. When the temperature continues to rise and exceeds the viscous flow transition zone temperature, the molecular chains inside the material begin to move. At this time, the molecular chains and segments move together. This state is called the viscous flow state of the material. The material is in a flowing state and the material is similar to a fluid.

[0027] The temperature of the area where the tip of the cannula is shaped is preferably controlled above the viscous transition zone temperature of the material, such as 200°C to 400°C, while the temperature of the area not processed at the tip needs to be controlled in the high elastic temperature region of the material, and more preferably the temperature range is controlled in or below the glass transition region of the material.

[0028] The conventional method is to use a single metal material to make the shaping block. Because metal materials are conductors, it is difficult to set the temperature of different positions inside it to different ranges during induction heating. Especially for cannulas with thinner walls, when shaping the tip, only the tip of the cannula needs to be shaped, and the part outside the tip still needs to remain firm. Since the temperature of the shaping block cannot be controlled to different ranges, this causes wrinkles to appear on the cannula when the tip of the cannula is processed. Wrinkled cannulas are prone to bending and are difficult to enter the blood vessel, resulting in puncture failure. Even if they barely enter the blood vessel, the cannula's pressure resistance and flow performance will decrease.

[0029] In order to solve the above problems, an embodiment of the utility model provides a shaping device for processing a cannula tip. The shaping device comprises: a first part, used to surround a part of the cannula; and a second part, connected to the first part, used to shape the end of the part of the cannula into a cannula tip; wherein the first part is made of insulating material, and the second part is made of metal material.

[0030] Figure 1 FIG. 1 shows a shaping device 100 for machining a cannula tip according to an embodiment of the present invention. Figure 1 As shown in the figure, the shaping device 100 includes a first part 10 and a second part 20. The first part 10 is used to surround a part of the cannula, and the second part 20 is connected to the first part 10 and is used to shape the end of the part of the cannula into a cannula tip. The first part 10 is made of insulating material, and the second part 20 is made of metal material. The shaping device 100 can effectively prevent the cannula with a thin wall from wrinkling when the tip is processed, thereby improving the success rate of puncture.

[0031] In some embodiments, the first part 10 may be a cylindrical structure with an inner cavity, and the second part 20 may be a cylindrical structure with an inner cavity. In other embodiments, the first part 10 and the second part 20 may also have structures of other shapes.

[0032] In some embodiments, the first part 10 has a first cylindrical inner cavity 11, and the second part 20 has a truncated conical inner cavity 21 and a second cylindrical inner cavity 22 connected to the first cylindrical inner cavity 11. The first end of the truncated conical inner cavity 21 is connected to the first cylindrical inner cavity 11, and the second end is connected to the second cylindrical inner cavity 22. The inner diameter of the first end of the truncated conical inner cavity 21 is the same as the inner diameter of the first cylindrical inner cavity 11, and the inner diameter of the second end is the same as the inner diameter of the second cylindrical inner cavity 22. The second cylindrical inner cavity 22 can play a role in exhausting on the one hand, and can play a role in limiting on the other hand, which is conducive to the discharge of the cannula tip processing.

[0033] In some embodiments, the first part 10 is made of ceramic or glass, and the second part 20 is made of SKD51, SKD61 or NAK80.

[0034] In some embodiments, the first part 10 and the second part 20 are connected to each other by bonding, welding or screwing.

[0035] Figure 2 FIG. 2 shows a schematic structural diagram of a shaping device 100 according to another embodiment of the present invention. Figure 2 As shown, the shaping device 100 includes a first part 10 and a second part 20. The first part 10 is used to surround a part of the cannula, and the second part 20 is connected to the first part 10 and is used to shape the end of the part of the cannula into a cannula tip. The first part 10 is made of insulating material, and the second part 20 is made of metal material.

[0036] and Figure 1 Compared with the embodiment shown in Figure 2 In the illustrated embodiment, the outer side of the first part 10 is wrapped with an electromagnetic shielding net 30. In some embodiments, the electromagnetic shielding net 30 is made of tin foil or copper foil. For example, the electromagnetic shielding net 30 can be a tin foil or copper foil tape, which is wrapped around the outer surface of the first part 10 for at least one full circle. In some embodiments, the outer side of the first part 10 is coated with electromagnetic shielding paint. By wrapping the electromagnetic shielding net 30 or applying electromagnetic shielding paint on the outer side of the first part 10 made of insulating material, a better electromagnetic shielding effect can be obtained, and high temperature can be further prevented.

[0037] In some embodiments, the height of the cannula tip 41 of the cannula 40 is 1 mm-4 mm, the outer diameter of the cannula 40, that is, the outer diameter of the first end of the cannula tip 41 is 0.6 mm-2.0 mm, and the outer diameter of the second end of the cannula tip 41 is 0.3 mm-1.5 mm. The size of the first cylindrical inner cavity 11 is slightly larger than the size of the cannula 40, and the size of the truncated conical inner cavity 21 is slightly larger than the size of the cannula tip 41. The inner diameter size of the cannula 40 can be set according to industry standards, and the embodiments of the present invention are not limited to this.

[0038] Figure 3-Figure 4 FIG. 4 is a schematic diagram showing a method of processing a cannula tip 41 using a shaping device 100 according to an embodiment of the present invention. Figure 3 and Figure 4As shown, the shaping device 100 is placed in a high-frequency changing electromagnetic field, and the sleeve 40 is pressed into the first cylindrical inner cavity 11 of the first part 10 of the shaping device 100. The first part 10 is made of insulating material and does not generate heat. The second part 20 is made of metal material, and the temperature rises through electromagnetic induction. When a part of the sleeve 40 is pressed into the truncated conical inner cavity 21 of the second part 20, it is deformed by the high temperature, thereby shaping into a sleeve tip 41. After the shaping is completed, the shaping device 100 is cooled and the sleeve 40 can be taken out.

[0039] When shaping the cannula tip 41, the temperature of the first portion 10 is controlled at or below the glass transition region of the cannula material, and the cannula 40 in the first portion 10 remains firm without wrinkles, thereby improving the puncture success rate of the formed catheter needle.

[0040] In an embodiment of the utility model, the first part of the shaping device is used to surround a part of the sleeve, and the second part is used to form the end of the part of the sleeve into a sleeve tip. The first part is made of insulating material, and the second part is made of metal material.

[0041] Compared with the existing shaping blocks made entirely of metal materials, the shaping device of the embodiment of the utility model can effectively prevent other parts of the cannula from being heated and wrinkled when processing the tip of the cannula, thereby preventing the cannula from bending due to wrinkles, making it difficult to enter the blood vessel and causing puncture failure.

[0042] The shaping device according to the embodiment of the utility model is suitable for processing the cannula tip of angiography catheter needle, and is also suitable for processing the cannula tips of various types of other catheter needles, such as intravenous indwelling needles, pressure-resistant indwelling needles, etc.

[0043] The technical content and technical features of the utility model have been disclosed above. However, it can be understood that under the creative idea of ​​the utility model, technicians in this field can make various changes and improvements to the above-disclosed concepts, but they all belong to the protection scope of the utility model. The description of the above implementation mode is illustrative rather than restrictive, and the protection scope of the utility model is determined by the claims.

Claims

1. A shaping device for processing a cannula tip, characterized in that: include: A first portion, for surrounding a portion of the casing; as well as a second portion connected to the first portion and used to shape a distal end of a portion of the cannula into the cannula tip; Wherein, the first part is made of insulating material, and the second part is made of metal material.

2. The shaping device for machining a cannula tip according to claim 1, characterized in that: The first portion has a first cylindrical inner cavity, and the second portion has a frustoconical inner cavity and a second cylindrical inner cavity communicating with the first cylindrical inner cavity.

3. The shaping device for machining a cannula tip according to claim 1, characterized in that: The first part is made of ceramic or glass.

4. The shaping device for machining a cannula tip according to claim 1, characterized in that: The second part is made of SKD51, SKD61 or NAK80.

5. The shaping device for machining a cannula tip according to claim 1, characterized in that: The first part and the second part are connected to each other by bonding, welding or screwing.

6. The shaping device for machining a cannula tip according to any one of claims 1 to 5, characterized in that: The outer side of the first part is wrapped with an electromagnetic shielding net.

7. The shaping device for machining a cannula tip according to claim 6, characterized in that: The electromagnetic shielding net is made of tin foil or copper foil.

8. The shaping device for machining a cannula tip according to any one of claims 1 to 5, characterized in that: The outer side of the first part is coated with electromagnetic shielding paint.

9. The shaping device for machining a cannula tip according to any one of claims 1 to 5, characterized in that: The height of the cannula tip of the cannula is 1 mm-4 mm.

10. The shaping device for machining a cannula tip according to any one of claims 1 to 5, characterized in that: The outer diameter of the first end of the cannula tip is 0.6 mm-2.0 mm, and the outer diameter of the second end of the cannula tip is 0.3 mm-1.5 mm.

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