Plugging device for plugging center hole of remaining needle and machining method

Abstract

The invention belongs to the field of medical equipment, and particularly discloses a plugging device for plugging a center hole of an indwelling needle and a machining method.The plugging device comprises a catheter base and an isolation piece, and the center hole of the catheter base is sequentially provided with a first stepped hole, a second stepped hole and a third stepped hole from top to bottom; the inner diameter of the first stepped hole is larger than that of the second stepped hole, and the inner diameter of the second stepped hole is larger than that of the third stepped hole. The isolation piece is arranged at the lower end of the second stepped hole, the lower end face of the isolation piece makes contact with the lower end face of the second stepped hole, and a fusion sealing blocking ring is arranged between the upper end face of the isolation piece and the hole wall of the second stepped hole. According to the device, the center hole of the guide pipe seat is blocked by the isolation piece, and the isolation piece is fixed through a hot melting process, so that the technological process is simplified, and compared with an existing UV light curing process, the process can effectively reduce the production cost and improve the production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of medical devices, specifically relating to a sealing device and processing method for sealing the central hole of an indwelling needle. Background Technology

[0002] Disposable indwelling needles have been widely used in routine medical procedures, with annual usage in my country alone not less than 1 billion needles, and this number continues to grow.

[0003] The isolating plug on a disposable indwelling needle is designed to effectively prevent blood from flowing out when the puncture is successful and the needle is removed. It is an indispensable component of indwelling needle products.

[0004] like Figure 6 As shown, the isolation plug on the disposable indwelling needle currently in use is a cylindrical rubber body with a diameter of 4.15 mm and a length of 7.6 mm. A groove with a width of 1 mm and a diameter of 3.4 mm is provided in the middle of the isolation plug. The purpose is to fill the groove with UV-curing adhesive during assembly, and then use ultraviolet light to ensure a tight bond between the isolation plug and the catheter seat. Because the length of the isolation plug is relatively large compared to the diameter of the puncture needle, the following steps are required during the assembly process of the puncture needle passing through the isolation plug: ① First, use a blade to make a longitudinal hole along the axis of the isolation plug; ② Use a cannula with an inner diameter larger than the outer diameter of the puncture needle to pass through the hole in the isolation plug; ③ Then, pass the puncture needle through the inner diameter of the cannula through the isolation plug; ④ Finally, remove the cannula. This completes the process of the puncture needle passing through the isolation plug. The processing technology is relatively complex and the processing efficiency is low. Summary of the Invention

[0005] In view of the problems existing in the background art, the present invention provides a sealing device and processing method for sealing the central hole of an indwelling needle.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a sealing device and processing method for sealing the central hole of an indwelling needle, comprising a catheter seat and an isolation plate, wherein the central hole of the catheter seat is provided with a first stepped hole, a second stepped hole and a third stepped hole from top to bottom; the inner diameter of the first stepped hole is larger than that of the second stepped hole, and the inner diameter of the second stepped hole is larger than that of the third stepped hole; the isolation plate is disposed at the lower end of the second stepped hole, the lower end face of the isolation plate is in contact with the lower end face of the second stepped hole, and a fusion sealing blocking ring is provided between the upper end face of the isolation plate and the hole wall of the second stepped hole.

[0007] The isolation plate is a circular thin plate. The outer diameter of the isolation plate is no larger than the inner diameter of the second stepped hole and larger than the inner diameter of the third stepped hole. The thickness of the isolation plate is less than the height of the second stepped hole.

[0008] The inner diameter of the sealing and blocking ring is smaller than the outer diameter of the insulating sheet.

[0009] A processing method for sealing the central hole of an indwelling needle includes a catheter seat, a spacer, and a heat fusion device. The processing method for sealing the central hole of an indwelling needle specifically includes the following steps: S1. Place the isolation plate: Place the isolation plate at the lower end of the second step hole of the guide tube seat, with the lower end face of the isolation plate in contact with the lower end face of the second step hole; S2. Use a hot melt sealer: a1. Preheat the heating head at the bottom of the hot melter to 220-230℃; a2. Insert the heating head of the hot melter vertically from the upper end of the first stepped hole of the guide tube seat to the upper end of the second stepped hole; a3. Move the heating head downwards. During the movement, the heating head melts the wall of the second stepped hole. The melted hole wall moves downwards to form a fusion sealing ring, which seals the gap between the isolation plate and the second stepped hole. a4. Raise the heat fusion device and remove it from the top of the guide tube seat; S3. Cooling: Place the sealed conduit in a room temperature environment to cool it down; S4. Inspection; checking whether the catheter hub is qualified.

[0010] The hot melt device includes a heating head and a connecting rod; the outer diameter of the connecting rod is not greater than the outer diameter of the heating head.

[0011] The outer diameter of the heating head is smaller than the inner diameter of the first stepped hole and larger than the inner diameter of the second stepped hole.

[0012] The beneficial effects of the present invention are as follows: The present invention provides a sealing device and processing method for sealing the central hole of an indwelling needle. The device uses an isolation plate to seal the central hole of the catheter seat and fixes the isolation plate by a hot-melt process, which simplifies the process. Compared with the existing UV curing process, this process can effectively reduce production costs and improve production efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention.

[0014] Figure 2 This is the front view of the conduit seat.

[0015] Figure 3 This is a schematic diagram of the spacer being placed inside the catheter hub.

[0016] Figure 4 This is a schematic diagram of the hot melter entering the central hole of the guide tube seat.

[0017] Figure 5 A schematic diagram of the melting of the second-step hole wall in a hot melter.

[0018] Figure 6 This is a schematic diagram of the existing technology.

[0019] In the figure: 1. Conduit seat, 2. Isolation plate, 3. Heat fusion device, 4. Fusion sealing ring, 11. First step hole, 12. Second step hole, 13. Third step hole, 31. Heating head, 32. Connecting rod. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The following detailed description of specific embodiments of the present invention, in conjunction with the accompanying drawings, illustrates a sealing device and processing method for sealing the central hole of an indwelling needle. The device includes a catheter seat 1 and an isolation plate 2. The central hole of the catheter seat 1 is provided with a first stepped hole 11, a second stepped hole 12, and a third stepped hole 13 sequentially from top to bottom. The first stepped hole 11 has a larger inner diameter than the second stepped hole 12, and the second stepped hole 12 has a larger inner diameter than the third stepped hole 13. The isolation plate 2 is disposed at the lower end of the second stepped hole 12, and the lower end face of the isolation plate 2 is flush with the first stepped hole 13. The lower end faces of the second-step hole 12 are in contact; the isolation plate 2 is a circular thin plate, the outer diameter of the isolation plate 2 is not greater than the inner hole of the second-step hole 12, and is greater than the inner hole of the third-step hole 13; the thickness of the isolation plate 2 is less than the height of the second-step hole 12; in actual use, after multiple tests, a thickness of 2-2.5mm is more suitable for the isolation plate 2; when the thickness of the isolation plate 2 is 2-2.5mm, the puncture needle 4 can easily pass through the isolation plate 2 without drilling holes in the isolation plate or using a sleeve, and without the need for UV protection. Photocurable adhesive and ultraviolet light source equipment; at the same time, the isolation sheet 2 will not be damaged by high temperature during the hot melting process due to its thinness, thus failing to achieve the sealing effect; a fusion sealing blocking ring 4 is provided between the upper end face of the isolation sheet 2 and the hole wall of the second stepped hole 12. The inner diameter of the fusion sealing blocking ring 4 is smaller than the outer diameter of the isolation sheet 2 and larger than the outer diameter of the puncture needle. The function of the fusion sealing blocking ring 4 is to completely seal the gap between the isolation sheet 2 and the second stepped hole 12. The inner hole of the sealing blocking ring 4 should be larger than the outer diameter of the puncture needle to facilitate the passage of the puncture needle; A processing method for sealing the central hole of an indwelling needle includes a catheter seat 1, a spacer 2, and a heat sealer 3. The processing method for sealing the central hole of an indwelling needle specifically includes the following steps: S1. Place the isolation plate 2: Place the isolation plate 2 at the lower end of the second stepped hole 12 of the guide tube seat 1, with the lower end face of the isolation plate 2 in contact with the lower end face of the second stepped hole 12. S2. Use a hot melter 3 for sealing: The hot melter 3 includes a heating head 31 and a connecting rod 32; the outer diameter of the connecting rod 32 is not greater than the outer diameter of the heating head 31; the outer diameter of the heating head 31 is smaller than the inner diameter of the first stepped hole 11 and larger than the inner diameter of the second stepped hole 12, so that the heating head 31 can pass through the first stepped hole 11 and melt the hole wall at the upper end of the second stepped hole 12; a1. Preheat the heating head 31 at the lower end of the hot melter 3 to 220-230℃; a2. Insert the heating head 31 of the hot melter 3 vertically from the upper end of the first stepped hole 11 of the guide tube seat 1 to the upper end of the second stepped hole 12. a3. Move the heating head 31 downwards. During the movement of the heating head 31, melt the hole wall of the second stepped hole 12. The molten hole wall moves downwards to form a molten sealing ring 4 to seal the gap between the isolation plate 2 and the second stepped hole 12. a4. Raise the heat melter 3 and remove it from the upper end of the guide tube seat 1; S3. Cooling: Place the sealed conduit seat 1 in a room temperature environment for cooling; S4. Inspection; check whether catheter seat 1 is qualified.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0023] The parts of this invention not described in detail are prior art.

Claims

1. A sealing device and processing method for sealing the central hole of an indwelling needle, comprising a catheter seat (1) and a spacer (2), characterized in that: The central hole of the catheter seat (1) is provided with a first stepped hole (11), a second stepped hole (12) and a third stepped hole (13) from top to bottom; the first stepped hole (11) is larger than the inner diameter of the second stepped hole (12), and the second stepped hole (12) is larger than the inner diameter of the third stepped hole (13); the isolation plate (2) is located at the lower end of the second stepped hole (12), the lower end face of the isolation plate (2) is in contact with the lower end face of the second stepped hole (12), and a sealing ring (4) is provided between the upper end face of the isolation plate (2) and the hole wall of the second stepped hole (12).

2. The sealing device for sealing the central hole of an indwelling needle according to claim 1, characterized in that: The isolation plate (2) is a circular thin plate. The outer diameter of the isolation plate (2) is not greater than the inner diameter of the second stepped hole (12) and is greater than the inner diameter of the third stepped hole (13). The thickness of the isolation plate (2) is less than the height of the second stepped hole (12).

3. The sealing device for sealing the central hole of an indwelling needle according to claim 1, characterized in that: The inner diameter of the sealing ring (4) is smaller than the outer diameter of the isolation plate (2).

4. A processing method for sealing the central hole of an indwelling needle, comprising a catheter seat (1), a spacer (2), and a heat fusion device (3), characterized in that: The processing method for sealing the central hole of the indwelling needle specifically includes the following steps: S1. Place the isolation plate (2): Place the isolation plate (2) at the lower end of the second step hole (12) of the guide tube seat (1), and the lower end face of the isolation plate (2) is in contact with the lower end face of the second step hole (12); S2. Use a hot melt machine (3) to seal: a1. Preheat the heating head (31) at the lower end of the hot melter (3) to 220-230℃; a2. Insert the heating head (31) of the hot melter (3) vertically from the upper end of the first stepped hole (11) of the guide tube seat (1) to the upper end of the second stepped hole (12); a3. Move the heating head (31) downwards. During the movement of the heating head (31), melt the hole wall of the second stepped hole (12). The molten hole wall moves downwards to form a molten sealing ring (4) to seal the gap between the isolation plate (2) and the second stepped hole (12). a4. Raise the heat melter (3) and remove the heat melter (3) from the upper end of the guide tube seat (1); S3. Cooling: Place the sealed conduit (1) in a normal temperature environment for cooling; S4. Inspection; check whether the catheter seat (1) is qualified.

5. The processing method for sealing the central hole of an indwelling needle according to claim 4, characterized in that: The hot melter (3) includes a heating head (31) and a connecting rod (32); the outer diameter of the connecting rod (32) is not greater than the outer diameter of the heating head (31).

6. The processing method for sealing the central hole of an indwelling needle according to claim 5, characterized in that: The outer diameter of the heating head (31) is smaller than the inner diameter of the first stepped hole (11) and larger than the inner diameter of the second stepped hole (12).

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