A syringe assembly for a high pressure injector

Abstract

The application discloses a needle cylinder assembly for a high-pressure injector, relates to medical consumables, and aims at the problem of excessive torsion and labor waste in the prior art. Two axial sliding grooves and a circumferential sliding groove are arranged on the inner side of the connecting part to guide the directional movement of the sliding block. A first guide inclined surface, a supporting surface and a second guide inclined surface with changing relative height are arranged in the two axial sliding grooves. The distance and force of each screwing and unscrewing are limited in a preset range. The labor waste caused by excessive force is avoided, and the working strength of medical staff is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to consumables related to medical devices, in particular to a syringe assembly for high-pressure injector. BACKGROUND

[0002] As shown in Figure 1 , Figure 2 , the syringe assembly dedicated to high-pressure injector mainly includes a syringe 10 and a transfusion tube 20 screwed with the syringe 10. The transfusion tube 20 branches a branch pipe 21 in the main pipe for feeding back the actual pressure of the liquid to the high-pressure injector. The end of the syringe 10 is provided with an adapter 11, and the head of the transfusion tube 20 is provided with a hand-held part 22 and a flange 23. The definition of the head and the end is based on the flow direction when the liquid is injected. The adapter 11 is provided with a tapered plug 12 extending along the central axis at the middle of the end, and the tapered plug 12 communicates the inside and outside of the syringe 10. The inner wall surface of the end of the adapter 11 is provided with an internal thread 13 at the position corresponding to the outside of the tapered plug 12.

[0003] When in use, the medical staff manually puts the flange 23 between the tapered plug 12 and the internal thread 13, and rotates the hand-held part 22 to press the tapered plug 12 tightly under the guidance of the internal thread 13, as shown in Figure 3 . Due to the concern of liquid leakage caused by not being screwed tightly, the medical staff deliberately increases the locking force. Since there is no clear parking position between the flange 23 and the internal thread 13, it is purely dependent on the real-time output torque of the medical staff, which often causes the tapered plug 12 and the inner ring of the flange 23 to be too tight. Although the sealing performance is good, in fact, on the one hand, the sealing effect is far beyond the factory design, and it is purely a waste of effort; on the other hand, when disassembling, it is necessary to retreat to rotate the hand-held part 22, and too tight locking will make it difficult to unscrew.

[0004] The busy department often has dozens of operations a day, even dozens of operations. Each operation needs to be connected / disconnected at least once, and some will be connected / disconnected several times. The excessive labor of the medical staff caused by excessive force results in waste and increases the workload of the medical staff. SUMMARY

[0005] The present application aims to provide a syringe assembly for high-pressure injector to solve the problems existing in the prior art.

[0006] The syringe assembly for high-pressure injector in the present application comprises a syringe and a transfusion tube.

[0007] One end of the syringe is used for mounting on the high-pressure injector, and the other end is fixedly provided with an adapter for adapting and screwing with the transfusion tube.

[0008] One end of the infusion tubing is used to connect to an external injection needle, and the other end is adapted to the connecting part; a branch tube is branched off from the infusion tubing to provide feedback on the actual pressure of the liquid to the high-pressure injector;

[0009] A handle is fixedly provided at the end of the infusion tube near the connector, and a protruding ring is fixedly provided at the end of the handle. Two sliders are symmetrically provided on the side of the protruding ring.

[0010] The connector end is internally provided with a tapered plug, which is coaxially arranged with the connector. One end of the tapered plug is fixedly connected to the inside of the connector and communicates with the syringe, while the other end of the tapered plug extends freely into the infusion tube. The connector end has a circumferential groove on the inner wall corresponding to the tapered plug, and also has two opposing axial grooves. The center of the circumferential groove overlaps with the axis of the connector, and the axial groove extends parallel to the axis of the connector. One end of the axial groove communicates with the circumferential groove, and the other end extends through to the lower end face of the connector. The width of the axial groove is adapted to the width of the slider, and the axial groove is used to allow the slider to move along the axial direction of the connector. The circumferential groove width is adapted to the slider height, and the circumferential groove is used to allow the slider to move along the circumferential direction of the inner side of the connecting part; a first guide slope extending upward along the circumference is provided on one side of the axial groove, and a countersunk platform extending towards the lower end face of the connecting part is provided at the end of the first guide slope away from the axial groove, and the end face of the countersunk platform forms a support surface; a second guide slope extending upward along the circumference is provided on the side of the support surface away from the first guide slope, and the end of the second guide slope away from the support surface is connected to the top of the axial groove; and the height of the end face of the axial groove near the first guide slope is less than the height of the end face near the second guide slope.

[0011] The syringe assembly for a high-pressure injector described in this invention has the advantage of limiting the distance and force of each screw-in and screw-out to a preset range. This avoids wasting labor due to excessive tightening and reduces the workload of medical staff. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a syringe assembly in the prior art.

[0013] Figure 2 This is a schematic diagram of the assembly of the syringe and the infusion tubing.

[0014] Figure 3 yes Figure 1 The image shows a magnified portion of the image, with a partial cross-section.

[0015] Figure 4 This is a schematic diagram of the assembly of the syringe and infusion tubing described in this invention.

[0016] Figure 5 right Figure 4 The diagram shows a partial cross-section of the connecting part.

[0017] Figure 6 This is a schematic diagram of a half-section of the connection part behind the hidden tapered plug.

[0018] Figure 7 This is a schematic diagram of the assembly of the syringe and infusion tube described in this invention from a second perspective.

[0019] Figure 8 This is a schematic diagram of the semi-sectional structure of the connector after the hidden tapered plug is shown from a second perspective.

[0020] Figure 9 It is a schematic diagram of the semi-sectional structure of the connector after the hidden conical plug is shown in the third view. The cross-section of the third view is perpendicular to the cross-section of the second view, but both are parallel to the central axis of the connector.

[0021] Figure label:

[0022] 10-Syringe, 11-Connector, 12-Conical plug, 13-Internal thread, 14-Axial groove, 15-Circumferential groove, 16-First guide slope, 17-Supporting surface, 18-Second guide slope;

[0023] 20-Infusion tube, 21-Branch tube, 22-Handheld part, 23-Flange, 24-Slider. Detailed Implementation

[0024] like Figures 4 to 9 As shown, the syringe assembly for a high-pressure injector described in this invention includes a syringe 10 and an infusion tubing 20.

[0025] One end of the syringe 10 is used to be mounted on a high-pressure injector, and the other end is fixedly provided with a connecting part 11 for fitting and screwing into the infusion tube 20.

[0026] One end of the infusion tube 20 is used to connect to an external injection needle, and the other end is adapted to the connector 11. A branch tube 21 branches off from the infusion tube 20 to provide feedback on the actual pressure of the liquid to the high-pressure injector.

[0027] A handle 22 is fixedly provided at the end of the infusion tube 20 near the connector 11. A protruding ring is fixedly provided at the end of the handle 22, and two sliders 24 are symmetrically provided on the side of the protruding ring.

[0028] The taper plug 12 is coaxially arranged inside the adapter 11. One end of the taper plug 12 is fixedly connected with the inside of the adapter 11 and communicates with the needle cylinder 10, and the other end of the taper plug 12 freely extends towards the infusion tube 20. The adapter 11 is provided with a circumferential sliding groove 15 on the inner side wall corresponding to the taper plug 12 at the end of the adapter 11, and is also provided with two opposite axial sliding grooves 14. The center of the circumferential sliding groove 15 overlaps the axis of the adapter 11, and the extension direction of the axial sliding groove 14 is parallel to the axis of the adapter 11. One end of the axial sliding groove 14 communicates with the circumferential sliding groove 15, and the other end penetrates to the lower end surface of the adapter 11. The width of the axial sliding groove 14 is matched with the width of the sliding block 24, and the axial sliding groove 14 is used for the sliding block 24 to move along the axis of the adapter 11. The width of the circumferential sliding groove 15 is matched with the height of the sliding block 24, and the circumferential sliding groove 15 is used for the sliding block 24 to move along the circumferential direction of the inner side surface of the adapter 11. The first guide inclined surface 16 extending upwards along the circumferential direction is arranged on one side of the axial sliding groove 14, and the end of the first guide inclined surface 16 away from the axial sliding groove 14 is provided with a sunken platform extending towards the lower end surface of the adapter 11, and the end surface of the sunken platform forms a supporting surface 17. The second guide inclined surface 18 extending upwards along the circumferential direction is arranged on the side of the supporting surface 17 away from the first guide inclined surface 16, and the end of the second guide inclined surface 18 away from the supporting surface 17 communicates with the top end of the axial sliding groove 14. The height of the end surface of the axial sliding groove 14 close to the first guide inclined surface 16 is less than the height of the end surface close to the second guide inclined surface 18.

[0029] The working principle is as follows:

[0030] When it is necessary to connect the infusion tube 20 with the needle cylinder 10, the sliding block 24 is sleeved into the opening position of the axial sliding groove 14 at the lower end surface of the adapter 11, and is axially moved to the connection position of the first guide inclined surface 16 and the axial sliding groove 14. At this time, since the height of the end surface of the axial sliding groove 14 close to the first guide inclined surface 16 is less than the height of the end surface close to the second guide inclined surface 18, the sliding block 24 will not be incorrectly connected to the second guide inclined surface 18. The handheld part 22 is rotated to move the sliding block 24 upwards along the first guide inclined surface 16, and in the moving process, the taper plug 12 gradually presses the inner side of the convex ring of the infusion tube 20. The handheld part 22 is continuously rotated, and the sliding block 24 will suddenly drop from the end of the first guide inclined surface 16 to the supporting surface 17, at this time, the relative position of the sliding block 24 and the adapter 11 is a pre-set appropriate sealing position, and the sealing property meets the design requirements. The depth of the supporting surface 17 is slightly lower than the height of the nearest end of the first guide inclined surface 16, which can maximize the waste of torque and avoid reverse rotation of the sliding block 24. For example, the depth of the supporting surface 17 is 0.1 to 0.2 cm lower than the height of the nearest end of the first guide inclined surface 16.

[0031] When it is needed to detach the infusion tube 20 from the needle cylinder 10, continue to rotate the hand-held part 22 in the same direction, move the slider 24 along the second guide slope 18 upward until it reaches the axial sliding groove 14 again, and finally move the slider 24 along the axial sliding groove 14 downward in the axial direction to separate from the connecting part 11.

[0032] For those skilled in the art, other various corresponding changes and modifications can be made according to the technical solutions and concepts described above, and all these changes and modifications shall belong to the protection scope of the present application.

Claims

1. A syringe assembly for a high pressure injector, comprising: The needle cylinder (10) and the infusion tube (20); One end of the needle cylinder (10) is used for mounting on a high-pressure injector, and the other end is fixedly provided with an adapter (11) for adaptively screwing with the infusion tube (20); One end of the infusion tube (20) is used for connecting an injection needle, and the other end is adapted with the adapter (11); the infusion tube (20) branches out a branch pipe (21) for feeding back the actual pressure of the current liquid to the high-pressure injector; The infusion tube (20) is fixedly provided with a hand holding part (22) at the end close to the adapter (11), and the end of the hand holding part (22) is fixedly provided with a convex ring, and two sliders (24) are symmetrically arranged on the side of the convex ring; The adapter (11) is internally provided with a tapered plug (12) at the end, the tapered plug (12) is coaxially arranged with the adapter (11); one end of the tapered plug (12) is fixedly connected with the inside of the adapter (11) and communicates with the needle cylinder (10), and the other end of the tapered plug (12) freely extends to the infusion tube (20); the adapter (11) is internally provided with a circumferential sliding groove (15) at the end corresponding to the tapered plug (12), and is also provided with two opposite axial sliding grooves (14); one end of the axial sliding groove (14) communicates with the circumferential sliding groove (15), and the other end penetrates to the lower end face of the adapter (11); the axial sliding groove (14) is provided with a first guide inclined surface (16) extending upward along the circumference on one side, the end of the first guide inclined surface (16) away from the axial sliding groove (14) is provided with a sunken table extending to the lower end face of the adapter (11), and the end face of the sunken table forms a supporting surface (17); the side of the supporting surface (17) away from the first guide inclined surface (16) is provided with a second guide inclined surface (18) extending upward along the circumference, and the end of the second guide inclined surface (18) away from the supporting surface (17) communicates with the top end of the axial sliding groove (14); and the height of the end face of the axial sliding groove (14) close to the first guide inclined surface (16) is less than the height of the end face close to the second guide inclined surface (18); Rotating the hand holding part (22) makes the slider (24) move upward along the first guide inclined surface (16), and in the moving process, the tapered plug (12) gradually presses the inner side of the convex ring of the infusion tube (20); continuing to rotate the hand holding part (22), the slider (24) will suddenly drop from the end of the first guide inclined surface (16) to the supporting surface (17), at this time, the relative position of the slider (24) and the adapter (11) is a pre-set appropriate sealing position, and the sealing property meets the design requirements; the depth of the supporting surface (17) is lower than the height of the nearest end of the first guide inclined surface (16); When it is needed to detach the infusion tube (20) from the needle cylinder (10), continue to rotate the hand holding part (22) in the same direction, make the slider (24) move upward along the second guide inclined surface (18) until it reaches the axial sliding groove (14) again, and finally move downward along the axial direction in the axial sliding groove (14) to separate from the adapter (11). ​ 2. A syringe assembly for a high pressure syringe according to claim 1, wherein, The center of the circumferential sliding groove (15) overlaps with the shaft center of the connecting part (11), and the extension direction of the axial sliding groove (14) is parallel to the axial direction of the connecting part (11); the width of the axial sliding groove (14) is matched with the width of the sliding block (24), and the axial sliding groove (14) is used for the axial movement of the sliding block (24) along the connecting part (11); the width of the circumferential sliding groove (15) is matched with the height of the sliding block (24), and the circumferential sliding groove (15) is used for the circumferential movement of the sliding block (24) along the inner side surface of the connecting part (11).

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