Pulse type deep venous catheter saline injector

Abstract

The utility model discloses a pulse type deep venous catheter saline injector which comprises a cylinder body, one end of the cylinder body is provided with a liquid outlet pipe communicated with the interior of the cylinder body, a piston is arranged in the cylinder body in a sliding mode, and the end, away from the liquid outlet pipe, of the piston is fixedly connected with one end of a threaded rod. A threaded rod is arranged at one end of the cylinder, a threaded sleeve matched with the threaded rod is rotationally arranged in the other end of the cylinder, a mounting disc is fixedly arranged outside the other end of the cylinder, a servo motor used for driving the threaded sleeve to rotate is arranged on the mounting disc, and a limiting disc is fixedly arranged at the end, away from the piston, of the threaded rod. According to the utility model, the injection dose deviation caused by manual injection is avoided, and the cleaning degree of washing the deep venous catheter is ensured; due to the fact that the one-way valve is arranged on the liquid outlet pipe, normal saline in the cylinder body can only flow to the outside of the liquid outlet pipe, and the situation that blood flows back to the syringe is prevented.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a pulse-type deep vein catheter saline injector. Background Technology

[0002] During ventilation and blood purification of patients, deep vein catheters (DVCs) often contain residual blood, requiring pulsatile saline injections for flushing. Currently, in clinical nursing practice, this pulsatile injection method is typically performed manually by healthcare professionals using a 5ml or 10ml syringe. Due to individual differences and experience among healthcare workers, this method cannot precisely control the injection dosage, easily resulting in over- or under-injection and insufficient flushing of the DVC. Furthermore, due to intravascular pressure, backflow of blood into the syringe is possible during flushing. Therefore, a pulsatile saline injector for deep vein catheters needs to be developed. Utility Model Content

[0003] The purpose of this invention is to provide a pulse-type deep vein catheter saline injector to solve the technical problems mentioned in the background section.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] This utility model discloses a pulse-type deep vein catheter saline injector, comprising a barrel, one end of which is provided with an outlet tube communicating with the interior of the barrel, a piston slidably disposed inside the barrel, the end of the piston away from the outlet tube being fixedly connected to one end of a threaded rod, a threaded sleeve adapted to the threaded rod being rotatably disposed inside the other end of the barrel, a mounting plate being fixedly disposed outside the other end of the barrel, a servo motor for driving the threaded sleeve to rotate being disposed on the mounting plate, and a limit plate being fixedly disposed at the end of the threaded rod away from the piston.

[0006] Furthermore, a one-way valve is installed on the liquid outlet pipe.

[0007] Furthermore, one end of the cylinder is provided with a connector that can be detachably connected to the liquid outlet pipe. The outer peripheral wall of the connector is provided with an external thread, and the inner peripheral wall of the liquid outlet pipe near the connector is provided with an internal thread that matches the external thread of the connector.

[0008] Furthermore, two limiting slide rails are symmetrically fixedly arranged on the inner circumferential wall of the cylinder, and two limiting slide grooves are symmetrically opened on the outer circumference of the piston, which are respectively adapted to the two limiting slide rails.

[0009] Furthermore, a connecting protrusion is fixedly provided on the inner peripheral wall of the other end of the cylinder, and a connecting ring groove is provided on the outer peripheral wall of the threaded sleeve to rotatably engage with the connecting protrusion.

[0010] Furthermore, the drive shaft of the servo motor is provided with a drive gear, and one end of the threaded sleeve extends to the outside of the cylinder and is fixedly fitted with a driven gear that meshes with the drive gear.

[0011] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0012] This invention uses a servo motor to drive a threaded sleeve to rotate. During the rotation of the threaded sleeve, the threaded rod connected to its thread moves linearly, thereby achieving the pushing and pulling action of the piston. The servo motor has accurate position control and adjustable speed. Through intermittent start and stop, it can perform pulsed saline injection cleaning of deep vein catheters, avoiding dosage deviations caused by manual injection and ensuring the cleanliness of the deep vein catheter flushing.

[0013] In addition, by installing a one-way valve on the outlet tube, this invention allows only the saline solution inside the syringe to flow to the outside of the outlet tube, preventing blood from flowing back into the syringe. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the external three-dimensional structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the internal cross-sectional structure of this utility model;

[0017] Figure 3 for Figure 2 A schematic diagram of the cross-section along the AA direction;

[0018] Explanation of reference numerals in the attached drawings: 1. Cylinder; 2. Discharge pipe; 3. Connector; 4. Check valve; 5. Piston; 6. Limiting slide rail; 7. Limiting slide groove; 8. Threaded rod; 9. Threaded sleeve; 10. Connecting convex ring; 11. Connecting ring groove; 12. Mounting plate; 13. Servo motor; 14. Drive gear; 15. Driven gear; 16. Limiting plate. Detailed Implementation

[0019] like Figures 1-3As shown, a pulse-type deep vein catheter saline injector includes a barrel 1, with an outlet tube 2 connected to the interior of the barrel 1 at one end. Specifically, one end of the barrel 1 is provided with a connector 3 detachably connected to the outlet tube 2. The outer peripheral wall of the connector 3 has external threads, and the inner peripheral wall of the outlet tube 2 near the connector 3 has internal threads that match the external threads of the connector 3. Furthermore, a one-way valve 4 is installed on the outlet tube 2. By providing a one-way valve on the outlet tube 2, only the saline solution inside the barrel can flow to the outside of the outlet tube, preventing blood from flowing back into the injector.

[0020] A piston 5 is slidably mounted inside the cylinder 1, and the outer peripheral wall of the piston 5 is in sliding and sealing fit with the inner peripheral wall of the cylinder 1. As an improvement, two limiting slide rails 6 are symmetrically fixed on the inner peripheral wall of the cylinder 1, and two limiting slide grooves 7 are symmetrically opened on the outer peripheral wall of the piston 5, which are adapted to the two limiting slide rails 6 respectively. Through the cooperation of the two sets of limiting slide grooves and limiting slide rails, the piston 5 can be prevented from rotating.

[0021] The piston 5, at one end away from the outlet pipe 2, is fixedly connected to one end of the threaded rod 8. A threaded sleeve 9, adapted to the threaded rod 8, is rotatably mounted inside the other end of the cylinder 1. Specifically, a connecting protrusion 10 is fixedly provided on the inner circumferential wall of the other end of the cylinder 1. A connecting ring groove 11, which rotatably engages with the connecting protrusion 10, is provided on the outer circumferential wall of the threaded sleeve 9. Through the engagement of the connecting groove with the connecting protrusion 10, the rotational engagement of the threaded sleeve 9 with the cylinder 1 is ensured while preventing the threaded sleeve 9 from moving along the axial direction of the cylinder 1.

[0022] A mounting plate 12 is fixedly installed on the exterior of the other end of the cylinder 1. A servo motor 13 for driving the threaded sleeve 9 to rotate is mounted on the mounting plate 12. Specifically, a drive gear 14 is mounted on the drive shaft of the servo motor 13, and one end of the threaded sleeve 9 extends to the exterior of the cylinder 1 and is fixedly fitted with a driven gear 15 that meshes with the drive gear 14. In addition, the mounting plate is also provided with a controller and control buttons (not shown in the figure) for controlling the start / stop state and speed of the servo motor.

[0023] A limiting plate 16 is fixedly provided at the end of the threaded rod 8 away from the piston 5.

[0024] This invention uses a servo motor to drive a threaded sleeve to rotate. During the rotation of the threaded sleeve, the threaded rod connected to its thread moves linearly, thereby achieving the pushing and pulling action of the piston. The servo motor has accurate position control and adjustable speed. Through intermittent start and stop, it can perform pulsed saline injection cleaning of deep vein catheters, avoiding dosage deviations caused by manual injection and ensuring the cleanliness of the deep vein catheter flushing.

[0025] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A pulsed deep vein catheter saline injector characterized by: The device includes a cylindrical body, one end of which is provided with a liquid outlet pipe communicating with its interior. A piston is slidably disposed inside the cylindrical body. The end of the piston away from the liquid outlet pipe is fixedly connected to one end of a threaded rod. A threaded sleeve adapted to the threaded rod is rotatably disposed inside the other end of the cylindrical body. A mounting plate is fixedly disposed outside the other end of the cylindrical body. A servo motor for driving the threaded sleeve to rotate is disposed on the mounting plate. A limit plate is fixedly disposed at the end of the threaded rod away from the piston.

2. The pulsed deep vein catheter saline injector of claim 1, wherein: A one-way valve is installed on the liquid outlet pipe.

3. The pulsed deep vein catheter saline injector of claim 2, wherein: One end of the cylinder is provided with a connector that can be detachably connected to the liquid outlet pipe. The outer peripheral wall of the connector is provided with an external thread, and the inner peripheral wall of the liquid outlet pipe near the connector is provided with an internal thread that matches the external thread of the connector.

4. The pulsed deep vein catheter saline injector of claim 1, wherein: Two limiting slide rails are symmetrically fixed on the inner circumferential wall of the cylinder, and two limiting slide grooves are symmetrically opened on the outer circumference of the piston, which are respectively adapted to the two limiting slide rails.

5. The pulsed deep vein catheter saline injector of claim 1, wherein: A connecting protrusion is fixedly provided on the inner peripheral wall of the other end of the cylinder, and a connecting ring groove is provided on the outer peripheral wall of the threaded sleeve to rotatably engage with the connecting protrusion.

6. The pulsed deep vein catheter saline injector of claim 1, wherein: The drive shaft of the servo motor is provided with a drive gear, and one end of the threaded sleeve extends to the outside of the cylinder and is fixedly fitted with a driven gear that meshes with the drive gear.

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