CN209933701U

CN209933701U - Pre-filled syringe with safety locking mechanism

Info

Publication number: CN209933701U
Application number: CN201920374886.4U
Authority: CN
Inventors: 赵啟臣; 崔香
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-23
Filing date: 2019-03-23
Publication date: 2020-01-14
Anticipated expiration: 2029-03-23

Abstract

The utility model relates to the technical field of common medical equipment, in particular to a pre-filled syringe with a safety locking mechanism. Including sleeve, slidable mounting's piston in the sleeve, telescopic rear end has the cardboard, and the rear end fixedly connected with core bar of piston, the rear end fixedly connected with push pedal of core bar, a plurality of fins of the surface evenly distributed of core bar, the both ends of fin are fixed connection respectively on piston and push pedal, and the center of cardboard has the through hole, and the diameter of through hole matches telescopic internal diameter, and the interval is provided with a plurality of jack catchs on the inner wall of through hole, the outside of fin has the opening that holds the jack catch. The prefilled syringe is reasonable in structure and convenient to use, the relative position between the piston and the injection sleeve can be locked by the aid of the matching of the clamping jaws and the fins, and the piston is prevented from displacing. The bacterium blocking cap arranged on the push plate can be used for sealing the pipe orifice at any time to avoid loss.

Description

Pre-filled syringe with safety locking mechanism

Technical Field

The utility model relates to the technical field of common medical equipment, in particular to a pre-filled syringe with a safety locking mechanism.

Background

Prefilled syringes are also known as prefilled syringes. The products are classified into two types, i.e., injection needles and non-injection needles. Various drugs and vaccines for injection are usually pre-filled with a syringe needle, and normal saline for flushing is usually pre-filled without the syringe needle. When the prefilled syringe is produced, a medicament or normal saline is filled into an injection sleeve, the front end of the injection sleeve is sealed by an end cover, and the rear end of the injection sleeve is sealed by a piston; when the device is used, the end cover at the front end is removed, and the piston push rod is pressed to push the piston, so that the medicine or the physiological saline can be pushed out. However, because there is no positioning mechanism to fix the relative position between the piston and the injection sleeve, the piston may be squeezed or stretched during transportation and delivery, and the pressure in the injection sleeve increases or decreases, at this time, if the sealing at the piston end or the end cap is not good, the leakage of the content or the air entering the injection sleeve is easy to occur, even if there is a fully-enclosed plastic bag outer package, the leakage of the liquid medicine will not only pollute the syringe, but also cause the loss of the medicine, which affects the accuracy of medication, and if the air enters the liquid medicine, the harm is larger. In addition, the prefilled syringe often needs to be used together with a venous indwelling needle or a flow guide tube, the port of the catheter needs to be temporarily closed after the liquid medicine is injected, and at the moment, the bacteria blocking cap only needs to be installed on the port of the catheter. Such as the disposable bacteria-resistant cap disclosed in the Chinese patent application 2010200613864. However, the bacteria-blocking cap is small in size and easy to lose or forget to carry.

Disclosure of Invention

The utility model aims at the aforesaid not enough provide a rational in infrastructure, convenient to use's pre-filling formula syringe that has safety locking mechanical system, have positioning mechanism between piston and the injection sleeve, can very conveniently relieve the locking again during the use, the fungus cap that hinders from the area can be used for sealing the mouth of pipe at any time, avoids losing.

The utility model discloses a solve the technical scheme that technical problem adopted as follows:

pre-filled syringe with safe locking mechanical system includes sleeve, slidable mounting's piston in the sleeve, telescopic front end has liquid outlet, rear end to have the cardboard, the rear end fixedly connected with core bar of piston, the rear end fixed connection push pedal of core bar, core bar and the coaxial setting of sleeve, a plurality of fins of the surface evenly distributed of core bar, a plurality of fins all are located the axis of core bar, and fixed connection is on piston and push pedal respectively at the both ends of fin, the center of cardboard has the through hole, the diameter of through hole matches telescopic internal diameter, and the interval is provided with a plurality of jack catchs on the inner wall of through hole, the outside of fin has the opening that holds the jack catch.

The number of the fins is four, and the fins are in a cross shape and are integrated with the core rod into a whole; the number of the clamping jaws is four, the gap between every two adjacent clamping jaws is larger than the thickness of the fin, and concave-convex stripes for increasing friction force are arranged on the surfaces of the clamping jaws.

An end cover is arranged on a liquid outlet at the front end of the sleeve; the push pedal is cylindric structure, and the rear end fixed connection sleeve pipe of push pedal, have the external screw thread on the sheathed tube outer wall and pass through the external screw thread cover is equipped with hinders the fungus cap, the external diameter that hinders the fungus cap equals with the external diameter of push pedal, pastes the joint department that has the joint strip who easily tears at hindering fungus cap and push pedal.

Due to the adoption of the structure, the prefilled syringe is reasonable in structure and convenient to use, the relative position between the piston and the injection sleeve can be locked by the matching of the clamping jaws and the fins, and the piston is prevented from displacing. The bacterium blocking cap arranged on the push plate can be used for sealing the pipe orifice at any time to avoid loss.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a sectional view a-a of fig. 1.

FIG. 3 is a schematic illustration of the piston and core pin construction.

Fig. 4 is a schematic structural diagram of another embodiment of the present invention.

Detailed Description

As shown in fig. 1, pre-filled syringe with safety locking mechanism includes sleeve 1, the piston 2 of slidable mounting in sleeve 1, sleeve 1's front end has liquid outlet, rear end to have cardboard 3, the rear end fixedly connected with core bar 4 of piston 2, the rear end fixedly connected with push pedal 5 of core bar 4, core bar 4 and the coaxial setting of sleeve 1, a plurality of fins 41 of the surface evenly distributed of core bar 4, a plurality of fins 41 all are located the axis of core bar 4 to core bar 4 is central to encircle the setting and form the integral structure with core bar 4, piston 2, push pedal 5. Each fin 41 extends outwards along the radial direction of the sleeve 1 with the core rod 4 positioned on the inner side as a starting point, the outer side of the fin 41 is in sliding fit with the inner wall of the sleeve 1, and the outer side of the fin 41 slides along the inner wall of the sleeve 1 when the piston 2 is pushed, so that the fin plays roles of supporting the axial movement of the core rod 4 and preventing the core rod from swinging left and right. As shown in fig. 3, the front and rear ends of the fin 41 are respectively fixedly connected to the piston 2 and the push plate 5, so as to form a supporting structure between the piston 2 and the push plate 5 and prevent the piston 2 or the push plate 5 from being laterally deviated. The clamping plate 3 and the sleeve 1 are of an integrated structure, the outer edge of the clamping plate 3 protrudes out of the outer wall of the sleeve 1 and is of an outward-turned folded plate shape, a through hole 31 is formed in the center of the clamping plate 3, the through hole 31 and the sleeve 1 are coaxially arranged, the diameter of the through hole 31 is matched with the inner diameter of the sleeve 1, and the core rod 4 with the fins 41 can penetrate through the through hole. A plurality of claws 32 are arranged on the inner wall of the through hole 31 at intervals, the number of the claws 32 is the same as that of the fins 41, the distribution positions of the claws 32 are in one-to-one correspondence with the fins 41 and are uniformly distributed around the central axis of the sleeve 1, the claws 32 are fan-shaped thin sheets extending from the inner wall of the through hole 31 to the center, and the outer sides of the fins 41 are provided with notches 42 for accommodating the claws 32. As shown in fig. 3, the slit 42 is provided at the tip of the fin 41 at a position close to the piston 2. The notch 42 has a depth that is just sufficient to accommodate the jaw 32 and a height that is comparable to the thickness of the jaw 32. As shown in fig. 1, in a storage and transportation state after production, a liquid medicine or a physiological saline is filled into the sleeve 1, the piston 2 is located at the rear end of the sleeve 1, and the claws 32 are clamped into the notches 42 on the fins 41, as shown in fig. 2, at this time, the claws 32 block the fins 41 from moving axially, so that the axial positions of the piston 2 and the core bar 4 are fixed, the piston 2 and the core bar 4 cannot move axially, liquid leakage is prevented, and the piston 2 can be prevented from falling off from the sleeve 1. When the medicine liquid pushing sleeve is used, the fin 41 is rotated by a certain angle through the rotating core rod 4 and is positioned in a gap between the two clamping jaws 32, at the moment, the clamping jaws 32 are separated from the notches 42 on the fin 41, and the core rod 4 and the piston 2 are pushed forwards by pressing the push plate 5, so that the medicine liquid in the sleeve 1 can be pushed out through the liquid outlet at the front end.

As a preferable scheme of the embodiment, the number of the fins 41 is four, and the fins are integrated with the core rod 4 in a crisscross shape; the number of the claws 32 is four, and the gap between two adjacent claws 32 is larger than the thickness of the fin 41, so that the fin 41 can smoothly pass through the gap between the claws 32 after the locking is released. In addition, the surface of the clamping jaw 32 is provided with concave-convex stripes for increasing the friction force, so that the friction force between the clamping jaw 32 and the notch 42 can be properly increased when the clamping jaw is clamped in the notch, and the limitation that the fin 41 is separated from the clamping jaw 32 due to the accidental rotation of the core rod 4 is avoided.

As shown in fig. 4, in the needleless injector for the flush line, an end cap 6 is installed on the liquid outlet at the front end of the sleeve 1, and the end cap 6 may be connected to the liquid outlet by a thread, or may be connected by other detachable connection methods such as a buckle; the push plate 5 is of a cylindrical structure, the rear end of the push plate 5 is fixedly connected with a sleeve 7, the outer wall of the sleeve 7 is provided with an external thread and is sleeved with a bacteria blocking cap 8 through the external thread, the bacteria blocking cap 8 is a cover which is provided with an internal thread and has a frustum-shaped plug at the center, the frustum-shaped plug is matched with an inner cavity of a medical catheter or a connector, and the medical catheter or the connector can be sealed by plugging the frustum-shaped plug at a pipe orifice. Push pedal 5 slightly is greater than sleeve pipe 7, form a boss at the front end of sleeve pipe 7, this boss is as hindering the stop gear of fungus cap 8, the front end that hinders fungus cap 8 when hindering fungus cap 8 to twist to target in place supports and leans on at the rear end of push pedal 5, can't continue to advance, will hinder fungus cap 8 through the screw thread and install firm in connection, be difficult to drop on sleeve pipe 7, hinder the smooth rear end face of fungus cap 8 and can be used for propelling movement core bar 4 forward, the finger contact surface is big during the propelling movement, the operation is felt better. The outer diameter of the bacteria-resisting cap 8 is equal to that of the push plate 5, and a sealing rubber strip 9 which is easy to tear is stuck at the joint of the bacteria-resisting cap 8 and the push plate 5. The sealing rubber strip 9 is a self-adhesive strip surrounding at least one circle, the joint of the head and the tail of the sealing rubber strip is provided with a flaky pull handle 91, and the sealing rubber strip 9 can play a role in sealing and prevent the sterilization cap 8 from being polluted. When the seal is unsealed, the sealing rubber strip 9 can be disassembled by pulling the pull handle 91, and the bacteria-blocking cap 8 is screwed off and is arranged at the open end of the medical catheter for sealing and preventing pollution. After the bacteria blocking cap 8 is unscrewed, a cavity is formed at the rear end of the sleeve 7, the cavity cannot be used for pushing the core rod 4, the syringe is obviously different from a reusable syringe, and people can be prevented from recycling the syringe.

Claims

1. Pre-filled syringe with safety locking mechanism, including sleeve (1), piston (2) of slidable mounting in sleeve (1), the front end of sleeve (1) has the liquid outlet, the rear end has cardboard (3), the rear end fixedly connected with core bar (4) of piston (2), rear end fixedly connected with push pedal (5) of core bar (4), core bar (4) and sleeve (1) coaxial setting, a plurality of fins (41) of the surface evenly distributed of core bar (4), a plurality of fins (41) all are located the axis of core bar (4), and fixed connection is on piston (2) and push pedal (5) respectively at the both ends of fin (41), its characterized in that: the clamping plate is characterized in that a through hole (31) is formed in the center of the clamping plate (3), the diameter of the through hole (31) is matched with the inner diameter of the sleeve (1), a plurality of clamping jaws (32) are arranged on the inner wall of the through hole (31) at intervals, and notches (42) for containing the clamping jaws (32) are formed in the outer side of the fin (41).

2. A pre-filled syringe with a safety locking mechanism according to claim 1, wherein: the number of the fins (41) is four, and the fins are combined with the core rod (4) into a whole in a cross shape; the number of the clamping jaws (32) is four, the gap between every two adjacent clamping jaws (32) is larger than the thickness of the fin (41), and concave-convex stripes for increasing friction force are arranged on the surfaces of the clamping jaws (32).

3. A pre-filled syringe with a safety lock mechanism according to claim 1 or 2, wherein: an end cover (6) is arranged on a liquid outlet at the front end of the sleeve (1); push pedal (5) are cylindric structure, rear end fixed connection sleeve pipe (7) of push pedal (5), have the external screw thread on the outer wall of sleeve pipe (7) and pass through the external screw thread cover is equipped with hinders fungus cap (8), the external diameter that hinders fungus cap (8) equals with the external diameter of push pedal (5), pastes sealing rubber strip (9) that have easily torn in the linking department that hinders fungus cap (8) and push pedal (5).