Method for manufacturing cannula using seamless steel pipe

Abstract

Disclosed is a method for manufacturing a cannula using a seamless steel pipe through a simple manufacturing process, wherein the cannula is rounded at the end to reduce the pain of medical procedures, and the cannula can be used for various purposes by forming the end of the cannula in an L-shape or an arrowhead shape. The method for manufacturing a cannula using a seamless steel pipe disclosed herein comprises: a step for preparing a seamless steel pipe having a hole formed at the center; a horizontal milling step for forming a horizontally bent portion by milling one end of the seamless steel pipe; a bending step for bending the bent portion vertically; a side milling step for forming a tip portion for withdrawing a suture, the tip portion being formed by laterally milling one end of the seamless steel pipe having the vertically-bent bent portion; and an outer diameter milling step for milling the outer diameter of the seamless steel pipe to a desired diameter.

Description

Method for manufacturing a cannula using a seamless steel pipe

[0001] The present invention relates to a method for manufacturing a cannula using a seamless 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-like shape 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, mainly 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. Looking closely at the tip structure of the cannula, the outer end of the weld is configured to be rounded from the top to the bottom, and the shape is a quarter oval. As a result, the upper end of the weld is shaped like a blade and forms a protruding peak, and the lower end is rounded such that the degree of protrusion gradually decreases as it goes backward.

[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 of the skin.

[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 by configuring the protrusion of the cannula tip to be rounded, especially the apex part to be rounded, not only reduces the pain of the procedure but also minimizes 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 seamless steel pipe, which has a rounded end to reduce surgical pain and has a simple manufacturing process.

[0011] In addition, the purpose is to provide a method for manufacturing a cannula using a seamless 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 seamless steel pipe according to an embodiment of the present invention is as follows:

[0014] It includes a step of preparing a seamless steel pipe having a hole formed in the center; a horizontal milling step of milling one end of the seamless steel pipe to form a horizontally bent portion; a bending step of vertically bending the bent portion; a side milling step of side-milling one end of the seamless steel pipe having the vertically bent bent portion formed to form a tip portion for drawing out a suture; and an outer diameter milling step of milling an outer diameter of the seamless steel pipe to form a desired diameter.

[0015] In a method for manufacturing a cannula using a seamless steel pipe according to an embodiment of the present invention, the bending step may be performed using a bending jig, and the bending jig may include a bending tool having a bending hole formed into which a portion of the front end of the bending portion is inserted, a bending tool up-and-down driving unit installed at a lower portion of the bending tool and repeatedly driving the bending tool up and down, a clamp for fixing the seamless steel pipe, and a clamp forward-backward-moving unit for repeatedly moving the clamp forward and backward in the direction of the bending tool.

[0016] In a method for manufacturing a cannula using a seamless steel pipe according to an embodiment of the present invention, the banding hole may be formed to have a size larger than the outer diameter of the seamless steel pipe.

[0017] In a method for manufacturing a cannula using a seamless steel pipe according to an embodiment of the present invention, when a portion of the tip of the bending part is inserted into the bending hole, the bending tool up-and-down driving part repeatedly moves the bending tool up and down, and the clamp forward-backward moving part repeatedly moves the clamp forward and backward in the direction of the bending tool, the bending part can be bent in a vertical direction while gradually bending.

[0018] In a method for manufacturing a cannula using a seamless steel pipe according to an embodiment of the present invention, after the outer diameter milling step, an additional milling process may be performed on the seamless steel pipe to make the end shape into an L shape or an arrowhead shape.

[0019]

[0020] Specific details of implementation examples according to various aspects of the present invention are included in the detailed description below.

[0021]

[0022] According to a method for manufacturing a cannula using a seamless 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, allowing for various uses. Furthermore, since it can be manufactured using simple processes such as milling / bending / milling, the difficulty of the manufacturing process can be reduced, thereby reducing manufacturing costs.

[0023]

[0024] Figure 1 is a flowchart illustrating a method for manufacturing a cannula using a seamless steel pipe according to one embodiment of the present invention.

[0025] Figure 2 is a drawing showing a horizontal milling step.

[0026] Figure 3 is a drawing showing a seamless steel pipe after performing the banding step.

[0027] Figure 4 is a diagram illustrating the banding step execution process.

[0028] Figure 5 is a drawing illustrating a side milling step.

[0029] Figure 6 is a drawing showing the outer diameter milling step.

[0030] FIG. 7 is a drawing showing various shapes of tip parts that can be manufactured using a method for manufacturing a cannula using a seamless steel pipe according to one embodiment of the present invention.

[0031]

[0032] 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.

[0033] 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 seamless steel pipe according to an embodiment of the present invention will be described with reference to the drawings.

[0034]

[0035] FIG. 1 is a flowchart illustrating a method for manufacturing a cannula using a seamless steel pipe according to an embodiment of the present invention, FIG. 2 is a drawing illustrating a horizontal milling step, FIG. 3 is a drawing illustrating a seamless steel pipe after performing a bending step, FIG. 4 is a drawing illustrating a process for performing a bending step, FIG. 5 is a drawing illustrating a side milling step, FIG. 6 is a drawing illustrating an outer diameter milling step, and FIG. 7 is a drawing illustrating various shapes of tip portions that can be manufactured using a method for manufacturing a cannula using a seamless steel pipe according to an embodiment of the present invention.

[0036] Referring to FIG. 1, a method for manufacturing a cannula using a seamless steel pipe according to one embodiment of the present invention may include a steel pipe preparation step (S110), a horizontal milling step (S120), a bending step (S130), a side milling step (S140), an outer diameter milling step (S150), and a post-processing step (S160). The various numerical values ​​described below are merely examples for explanation, and the scope of the invention is not limited thereto.

[0037] First, prepare a metal pipe. (S110)

[0038] There are two ways to make steel pipes: bending steel plates and welding the seams, or drilling holes in bar steel and forming them. The former is called welded steel pipe, and the latter is called seamless steel pipe.

[0039] Seamless steel pipe refers to a steel pipe manufactured by heating a material such as a billet, making a hole in the center with a perforator, and then rolling or drawing it with a drawing machine to produce a hollow material with a specified outer diameter and thickness. There are various methods, such as the inclined rolling method, which makes holes in the material and then draws it, and the pressing method, which extrudes already perforated material with a press.

[0040] In the present invention, a seamless steel pipe with a hole formed in the center is used for manufacturing a cannula. For example, the seamless steel pipe may be a stainless steel tube according to the ASTM A269 / A269M standard, which is one of the standards established by ASTM International, and may be SUS 304, which is stainless steel containing about 18% chromium (Cr) and 8% nickel (Ni), or SUS 316, which has a chromium content of 16% and a nickel content of 10% or more. Of course, the material of the seamless steel pipe is not limited thereto. And, for example, the outer diameter may be 2.53 mm and the inner diameter may be 0.84 mm.

[0041] Next, as shown in (a) of Fig. 2, a notch (111) is formed on the outer diameter of one end of a seamless steel pipe (100), and then a horizontal bend (110) is formed by cutting through horizontal milling. (S120) At this time, the milling process uses a widely known automatic lathe machine, and the milling process height may be a height at which the inner diameter (101) of the seamless steel pipe is exposed. For example, in the case of a seamless steel pipe having an outer diameter of 2.53 mm and an inner diameter of 0.84 mm, the milling process height may be 1.25 mm. Fig. 2 (b) is a plan view.

[0042] Next, as illustrated in FIG. 3, the bending portion (110) is bent in a vertical direction. (S130) At this time, the bending portion (110) is bent in a vertical direction using a banding jig (200) as illustrated in FIG. 4. Here, vertical does not necessarily mean 90 degrees. (a) of FIG. 3 is a side view and (b) is a plan view.

[0043] Referring to FIG. 4, the banding jig (200) includes a banding tool (210), a banding tool upper and lower driving part (220), a clamp (230), and a clamp forward and backward part (240).

[0044] A banding hole (211) is formed in the banding tool (210) into which a portion of the tip of the bending portion (110) to be banded is inserted. The banding hole (211) is formed to have a size larger than the outer diameter of the seamless steel pipe, which is the size of the bending portion (110).

[0045] The banding tool upper and lower driving unit (220) is installed at the bottom of the banding tool (210) and repeatedly drives the banding tool (210) up and down. The banding tool upper and lower driving unit (220) may be an actuator that moves up and down in a vertical direction.

[0046] The clamp (230) fixes the seamless steel pipe (100), and the clamp forward / backward movement unit (240) repeatedly moves the clamp (230) forward / backward in the direction of the banding tool (210). The clamp forward / backward movement unit (240) may be an actuator that moves forward / backward in a horizontal direction.

[0047] When a portion of the tip of the bending part (110) is inserted into the banding hole (211), the banding tool upper and lower driving part (220) repeatedly moves the banding tool (210) up and down, and the clamp forward and backward part (240) repeatedly moves the clamp (230) forward and backward in the direction of the banding tool (210), the bending part (110) is gradually bent and bent in the vertical direction.

[0048] Next, as illustrated in (a) of Fig. 5, the upper part of one end of the seamless steel pipe, in which a vertically bent portion is formed, is side-milled in a direction perpendicular to the ground using an automatic lathe. (S140) Fig. 5 (b) is a side view showing the result of the upper side milling. As a result of the side milling, a tip part (120) for pulling out a suture is formed at the end of the seamless steel pipe (100).

[0049] Next, as shown in (a) of Fig. 6, an outer diameter milling process is performed on the seamless steel pipe (100) to form the outer diameter to the desired diameter and length. (S150)

[0050] Next, post-processing is performed to smooth the part where the tip portion (120) is formed by polishing it. (S160)

[0051] Alternatively, an additional milling process may be performed on the tip portion (120) to make the end shape of the cannula into an L shape as in (a) of FIG. 7 or an arrowhead shape as in (b) of FIG. 7, so that it can be used for various purposes.

[0052]

[0053] According to the method for manufacturing a cannula using a seamless steel pipe according to an 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 milling / bending / milling, the difficulty of the manufacturing process can be reduced, thereby reducing the manufacturing cost.

[0054]

[0055] 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.

[0056]

[0057] 100: Seamless steel pipe

[0058] 110: Bending section

[0059] 120: Tip section

[0060] 200: Banding Jig

[0061] 210: Banding Tool

[0062] 220: Banding tool upper and lower drive unit

[0063] 230: Clamp

[0064] 240: Clamp forward and backward

Claims

1. Step of preparing a seamless steel pipe with a hole formed in the center; A horizontal milling step of forming a horizontal bend by milling one end of the above-mentioned seamless steel pipe; A banding step for banding the above-mentioned bending portion in a vertical direction; A side milling step for forming a tip for drawing out a suture by side milling one end of a seamless steel pipe having a bend formed in the vertical direction; An outer diameter milling step of forming a desired diameter by milling the outer diameter of the above seamless steel pipe; A method for manufacturing a cannula using a seamless steel pipe, comprising:

2. In claim 1, The above banding step is performed using a banding jig, and the banding jig comprises: A banding tool having a banding hole formed into which a portion of the tip of the above-mentioned bending section is inserted, A banding tool upper and lower driving unit installed at the bottom of the above banding tool and repeatedly driving the above banding tool up and down, A clamp for fixing the above-mentioned seamless steel pipe, Clamp forward / backward movement part that repeatedly moves the clamp forward / backward in the direction of the banding tool A method for manufacturing a cannula using a seamless steel pipe, comprising:

3. In claim 2, A method for manufacturing a cannula using a seamless steel pipe, wherein the above-mentioned banding hole is formed to have a size larger than the outer diameter of the seamless steel pipe.

4. In claim 3, When a portion of the tip of the above bending part is inserted into the above banding hole, the banding tool upper and lower driving part repeatedly moves the banding tool up and down, and the clamp forward and backward part repeatedly moves the clamp forward and backward in the direction of the banding tool, the bending part gradually bends and is bent in the vertical direction. Method for manufacturing a cannula using a seamless steel pipe.

5. In claim 1, A method for manufacturing a cannula using a seamless steel pipe, wherein after the above outer diameter milling step, an additional milling process is performed on the seamless steel pipe to make the end shape into an L shape or an arrowhead shape.

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