Method for manufacturing cannula using stainless steel pipe

Abstract

Disclosed is a method for manufacturing a cannula using a stainless steel pipe, wherein an end of the cannula is formed to be rounded to reduce the pain in a medical procedure, the cannula can be used for various purposes by forming the end of the cannula in an L-shape or an arrowhead shape, and the manufacturing process thereof is simple. The disclosed method for manufacturing a cannula using a stainless steel pipe includes: a step of preparing a stainless steel pipe; a compression step of compressing one end of the stainless steel pipe to form a first tip portion in which a step is formed; a friction heat forming step of forming the first tip portion by friction heat forming to form a second tip portion in which the step is formed into an inclined surface; and a side milling step of milling the stainless steel pipe in a side direction to form a tip portion for suture withdrawal.

Description

Method for manufacturing a cannula using stainless steel pipe

[0001] The present invention relates to a method for manufacturing a cannula using a stainless steel pipe, which reduces the pain of the procedure by forming the end of the cannula round, while simplifying the manufacturing process.

[0002]

[0003] Medical cannulas are mainly used to inject drugs and other substances subcutaneously. Their structure is a tube-shaped structure with a hollow space formed along the length of the tube through which the drug passes.

[0004] Recently, medical cannulas have been widely used for suture injections for purposes such as wrinkle prevention, muscle regeneration, and skin tissue regeneration, especially in dermatology and plastic surgery, in addition to drug injections.

[0005] Korean Patent Registration No. 1537185 (Medical Injection Needle and Manufacturing Method Thereof) discloses a cannula in which one end of the cannula is welded and then cut into an 'L' shape. A closer look at the tip structure of the cannula reveals that the outer end of the weld is rounded from top to bottom, forming a quarter-oval shape. As a result, the upper end of the weld forms a blade-like shape with a protruding peak, while the lower end has a rounded shape in which the degree of protrusion gradually decreases as it moves toward the rear.

[0006] Cannulas with this protruding shape can damage or cut blood vessels, nerves, muscles, etc. when inserted into the skin due to the blade-like shape of the end of the cannula, which can increase the pain of the procedure and even cause bruising.

[0007] To improve this, Korean Patent Publication No. 10-2020-0032323 (Medical cannula and manufacturing method thereof) forms the protrusion apex of the cannula tip in the middle or lower side to facilitate peeling of skin tissue during the procedure, and rounds the protrusion of the cannula tip, especially the apex, to reduce the pain of the procedure and minimize damage to nerves, muscles, blood vessels, etc. during the procedure.

[0008] However, there are problems such as the manufacturing process is difficult due to the complex shape of the pipe end, which is manufactured by welding at a microscopic size, and the manufacturing cost increases accordingly.

[0009]

[0010] The purpose of the present invention is to provide a method for manufacturing a cannula using a stainless steel pipe, which reduces the pain of the procedure by forming the end of the cannula round, and has a simple manufacturing process.

[0011] In addition, the purpose is to provide a method for manufacturing a cannula using a stainless steel pipe that can be used for various purposes by implementing the end of the cannula in an L-shape or an arrowhead shape.

[0012]

[0013] A method for manufacturing a cannula using a stainless steel pipe according to an embodiment of the present invention is as follows:

[0014] It includes a step of preparing a stainless steel pipe; a pressing step of pressing one end of the stainless steel pipe to form a first tip portion having a step formed therein; a friction heat forming step of subjecting the first tip portion to friction heat forming to form a second tip portion having the step formed into an inclined surface; and a side milling step of milling the stainless steel pipe in a side direction to form a tip portion for drawing out a suture.

[0015] In the method for manufacturing a cannula using a stainless steel pipe according to an embodiment of the present invention, the stainless steel pipe may be a welded steel pipe or a seamless steel pipe.

[0016] In the method for manufacturing a cannula using a stainless steel pipe according to an embodiment of the present invention, it is preferable that the thickness of the first tip portion be formed to be half the size of the outer diameter of the stainless steel pipe.

[0017] In the method for manufacturing a cannula using a stainless steel pipe according to an embodiment of the present invention, the friction heat forming step is performed using a friction heat forming jig, and the friction heat forming jig may include a forming tool having a forming hole and an inclined processing surface formed thereon and applying heat to the first tip portion, and a forming tool rotation driving unit that rotates the forming tool to form the first tip portion inserted into the forming tool using friction heat.

[0018] In a method for manufacturing a cannula using a stainless steel pipe according to an embodiment of the present invention, a post-processing step of polishing the leading edge of the second tip portion to make it smooth may be included.

[0019] In a method for manufacturing a cannula using a stainless steel pipe according to an embodiment of the present invention, the second tip portion may be horizontally milled to form an end shape in an L shape.

[0020]

[0021] Specific details of implementation examples according to various aspects of the present invention are included in the detailed description below.

[0022]

[0023] According to a method for manufacturing a cannula using a stainless steel pipe according to one embodiment of the present invention, the end of the cannula can be formed to be rounded, thereby reducing the pain of the procedure. Alternatively, the end of the cannula can be formed into an L-shape or an arrowhead shape, enabling it to be used for various purposes. Furthermore, since it can be manufactured through simple processes such as pressing / friction heat forming / milling, the difficulty of the manufacturing process can be reduced, thereby reducing manufacturing costs.

[0024]

[0025] FIG. 1 is a flowchart illustrating a method for manufacturing a cannula using a stainless steel pipe according to one embodiment of the present invention.

[0026] Figure 2 is a drawing illustrating the process of performing the compression step.

[0027] Figure 3 is a drawing showing a stainless steel pipe after performing a pressing step.

[0028] Figure 4 is a drawing for explaining the friction heat forming step.

[0029] Figure 5 is a drawing showing a stainless steel pipe after performing a friction heat forming step.

[0030] Figure 6 is a drawing illustrating a side milling step.

[0031] Figure 7 is a drawing showing a stainless steel pipe after performing a post-processing step.

[0032] Figure 8 is a drawing showing the process of manufacturing the end of a cannula in an L-shaped shape.

[0033] Figure 9 is a drawing showing the end of a cannula in the shape of an arrowhead.

[0034]

[0035] The present invention is susceptible to various modifications and embodiments. Specific embodiments are illustrated and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention.

[0036] The terminology used in the present invention is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In the present invention, it should be understood that the terms such as "comprise" or "have" are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof. Hereinafter, a method for manufacturing a cannula using a stainless steel pipe according to an embodiment of the present invention will be described with reference to the drawings.

[0037]

[0038] FIG. 1 is a flowchart illustrating a method for manufacturing a cannula using a stainless steel pipe according to one embodiment of the present invention, FIG. 2 is a drawing illustrating a process of performing a pressing step, FIG. 3 is a drawing illustrating a stainless steel pipe after performing the pressing step, FIG. 4 is a drawing for explaining a friction heat forming step, FIG. 5 is a drawing illustrating a stainless steel pipe after performing the friction heat forming step, FIG. 6 is a drawing illustrating a side milling step, and FIG. 7 is a drawing illustrating a stainless steel pipe after performing a post-processing step.

[0039] As illustrated in FIG. 1, a method for manufacturing a cannula using a stainless steel pipe according to one embodiment of the present invention may include a pipe preparation step (S110), a pressing step (S120), a friction heat forming step (S130), a side milling step (S140), and a post-processing step (S150). The various numerical values ​​described below are merely examples for illustrative purposes, and the present invention is not limited thereto.

[0040] First, prepare a stainless steel pipe made of metal (S110).

[0041] Steel pipes can be made by bending steel plates and welding the seams, or by drilling holes in bar steel and forming them. The former is called a welded steel pipe, and the latter is called a seamless steel pipe. In the present invention, stainless steel pipes include welded steel pipes and seamless steel pipes.

[0042] Seamless steel pipe can be a stainless steel tube that complies with the ASTM A269 / A269M standard, one of the standards established by ASTM International, and can be SUS 304, a stainless steel containing approximately 18% chromium (Cr) and 8% nickel (Ni), or SUS 316, which has a chromium content of 16% and a nickel content of at least 10%. Of course, the materials for seamless steel pipe are not limited to these.

[0043] The outer diameter of the stainless steel pipe (100) may be 1.27 mm, and the inner diameter may be 0.83 mm.

[0044] Next, as illustrated in Fig. 2, one end (101) of a stainless steel pipe (100) is compressed using a compression machine. (S120) At this time, only the outer surface of the end (101) of the stainless steel pipe (100) may be compressed, or the outer surface of the end (101) of the stainless steel pipe (100) and the entire surface of the end (101) may be compressed.

[0045] As a result of the pressing, as shown in FIG. 3, one end (101) of the stainless steel pipe (100) can be processed into a first tip portion (110) having a step formed therein. At this time, it is preferable that the thickness of the first tip portion (110) be processed to be half the size of the outer diameter of the stainless steel pipe (100). For example, since the outer diameter of the stainless steel pipe (100) is 1.27 mm, it is preferable that the thickness (t) of the first tip portion (110) be 0.83 mm.

[0046] Next, as illustrated in FIG. 4, the first tip portion (110) is subjected to friction heat forming processing using a friction heat forming jig (200). (S130) The friction heat forming jig (200) includes a forming tool (210), a forming tool rotation drive unit (220), a clamp (230), and a clamp forward / backward movement unit (240).

[0047] The forming tool (210) has a shape in which the first tip portion (110) is processed by frictional heat. Specifically, the forming tool (210) includes a forming hole (211) and an inclined processing surface (212), and can be heated by an external power source to provide heat to the first tip portion (110). For example, the forming tool (210) can provide heat of approximately 1350°C.

[0048] It is preferable that the forming hole (211) has a diameter smaller than the thickness (t) of the first tip portion (110). For example, if the thickness (t) of the first tip portion (110) is 0.83 mm, it is preferable that the forming hole (211) is formed with a diameter of 0.5 mm. If the diameter of the forming hole (211) is smaller than the thickness (t) of the first tip portion (110), the first tip portion (110) may be formed into a sharp end by entering the forming hole (211) while being processed by frictional heat.

[0049] The inclined processing surface (212) is formed in a cone shape when viewed from the entry direction of the stainless steel pipe (100). The first tip portion (110) can be processed into a cone shape, which is the shape of the inclined processing surface (212), by melting due to frictional heat.

[0050] The molding tool rotation drive unit (220) is installed to contact at least a portion of the outer surface of the molding tool (21) and rotates the molding tool (210). The molding tool rotation drive unit (220) is formed by being connected to a rotation motor, and can rotate the molding tool (210) according to the operation of the rotation motor.

[0051] The clamp (230) fixes the stainless steel pipe (100), and the clamp forward / backward part (240) moves the clamp (230) forward or backward toward the forming tool (210). The clamp forward / backward part (240) may be an actuator that moves forward and backward in a horizontal direction.

[0052] When a stainless steel pipe (100) is inserted into a forming tool (210), the first tip portion (110) is melted by frictional heat, and the front end of the first tip portion (110) is processed into a sharp shape in the forming hole (211), and the remainder is melted and processed into the shape of an inclined processing surface (212).

[0053] As shown in Fig. 5, after the friction heat forming step (S130), the first tip portion (110) is formed by friction heat to become the second tip portion (120) in which the step portion is formed into a conical shape.

[0054] Next, as shown in (a) of Fig. 6, using an automatic lathe machine, one end of a stainless steel pipe (100) having a second tip portion (120) formed thereon is side-milled in a direction perpendicular to the ground (S140). Fig. 6 (b) is a side view showing the result of side-milling. As a result of side-milling, a third tip portion (130) for pulling out a suture is formed at the end of the stainless steel pipe (100).

[0055] Next, as shown in Fig. 7, a post-processing treatment is performed to polish and smooth the leading edge portion of the second tip portion (120). (S150)

[0056] Additionally, as shown in FIG. 8, an additional milling process for horizontally milling the second tip portion (120) is performed so that the end shape of the cannula becomes an L shape as shown in (b) of FIG. 8, or the process for polishing the tip portion of the second tip portion (120) is omitted so that the end shape of the cannula becomes an arrowhead shape as shown in FIG. 9, so that it can be used for various purposes.

[0057]

[0058] According to the method for manufacturing a cannula using a stainless steel pipe according to one embodiment of the present invention as described above, the end of the cannula can be formed to be rounded, thereby reducing the pain of the procedure. Alternatively, the end of the cannula can be formed in an L-shape or an arrowhead shape, allowing it to be used for various purposes. Furthermore, since it can be manufactured through simple processes such as pressing / friction heat forming / milling, the difficulty of the manufacturing process can be reduced, thereby reducing the manufacturing cost.

[0059]

[0060] Above, one embodiment of the present invention has been described, but a person having ordinary skill in the art will be able to modify and change the present invention in various ways by adding, changing, deleting or adding components, etc., within the scope that does not depart from the spirit of the present invention described in the claims, and this will also be considered to be included within the scope of the rights of the present invention.

[0061]

[0062] 100: Stainless steel pipe 110: First tip

[0063] 120: Second tip section

[0064] 130: Third Tip Section

[0065] 200: Friction heat forming jig 210: Forming tool

[0066] 220: Molding tool rotation drive unit

[0067] 230: Clamp

[0068] 240: Clamp forward and backward

Claims

1. Step for preparing stainless steel pipe; A pressing step of pressing one end of the above stainless steel pipe to form a first tip portion having a step; A friction heat forming step in which the first tip portion is subjected to friction heat forming processing to form a second tip portion in which the step is formed as an inclined surface; A side milling step for forming a tip portion for drawing out a suture by milling the stainless steel pipe in a side direction; A method for manufacturing a cannula using a stainless steel pipe, including:

2. In claim 1, The above stainless steel pipe is a welded steel pipe or a seamless steel pipe, and a method for manufacturing a cannula using a stainless steel pipe.

3. In claim 1, A method for manufacturing a cannula using a stainless steel pipe, wherein the thickness of the first tip portion is formed to be half the size of the outer diameter of the stainless steel pipe.

4. In claim 1, The above friction heat forming step is performed using a friction heat forming jig, and the friction heat forming jig is: A forming tool that forms a forming hole and an inclined processing surface and applies heat to the first tip portion, A molding tool rotation drive unit that rotates the molding tool to mold the first tip portion inserted into the molding tool by frictional heat. A method for manufacturing a cannula using a stainless steel pipe, including:

5. In claim 1, A method for manufacturing a cannula using a stainless steel pipe, comprising a post-processing step of polishing and smoothing the tip portion of the second tip portion.

6. In claim 5, A method for manufacturing a cannula using a stainless steel pipe, wherein the second tip portion is horizontally milled to form an end shape of an L shape.

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