CN102940922B - Mixing pre-filled and sealed injector - Google Patents

Abstract

The invention provides a mixed medicine prefilling syringe, which has simple structure, simple solute and solvent filling, low production cost and easy realization of mass production. It includes a solute injector and a solvent injector. The solute injector specifically includes a core rod, a jacket, a piston, and a plug. The inner cavity of the jacket is equipped with the core rod, and the front end of the core rod is set with the piston. The ring surface of the outer edge of the piston is close to the inner wall of the outer casing, and a solute solution cavity is formed between the lower end surface of the piston and the inner wall of the lower outer casing, and the front outlet of the outer casing is set with the plug, which is characterized in that : the top of the core rod of the solute injector is provided with an inner ring slot, the lower end of the screw seat is clipped in the inner ring slot, the inside of the screw seat is covered with a needle seat, and the upper end of the needle is fastened on the For the needle seat, the upper end surface of the needle seat is lower than the upper end surface of the spiral seat and forms a gap, and the upper end of the needle communicates with the gap.

Description

Mixed drug prefilled syringe

technical field

The invention relates to the technical field of syringe structures, in particular to a drug-mixing prefilled syringe.

Background technique

In the traditional syringe operation process, the solvent (water for injection, etc.) should be drawn out with the syringe first, then the needle of the syringe should be inserted into the solute bottle (powder injection or water injection), and then the solvent and solute should be pushed out to mix and dissolve, and finally the mixed medicine solution should be drawn out to the Only in the syringe can the human body be injected or add medicine to the infusion bottle. This method of operation not only has complicated procedures, but also requires a lot of labor for nurses, and the liquid medicine has to be transferred several times, which is easy to contaminate. The most important thing is that it is easy to cause medical accidents due to the use of wrong medicine, until it endangers the life safety of patients.

Existing pre-filling syringes, they all are filled in the syringe after medicine is prepared. Since the prefilled syringe is produced well enough to be used by the patient for a certain period of time, due to the long-term mixing of the solvent and the solute in the syringe, the mixed reaction of the solvent and the solvent, or the mixed reaction of the solvent and the solute, or the mixed reaction of the solute and solute, or The mass of solute and solvent changes, which also reduces the efficacy of the drug and also has side effects of the drug.

The existing mixed drug prefilled syringes have complex structures, troublesome solute and solvent filling, troublesome drug mixing before injection, high production cost, and it is difficult to realize mass production.

Contents of the invention

In view of the above problems, the present invention provides a prefilled syringe for mixed medicine, which has a simple structure, simple filling of solute and solvent, low production cost, and easy realization of batch production.

The technical scheme of the mixed drug prefilled syringe is as follows: it includes a solute injector and a solvent injector, and the solute injector specifically includes a core rod, a jacket, a piston, and a stopper, and the inner cavity of the jacket is equipped with the core rod, The front end of the core rod is covered with the piston, the outer ring surface of the piston is close to the inner wall of the outer casing, and a solute solution cavity is formed between the lower end surface of the piston and the inner wall of the lower outer casing. The front end outlet of the jacket is covered with the plug, and the feature is that: the top of the core rod of the solute injector is provided with an inner ring slot, and the lower end of the screw seat is clipped in the inner ring slot, and the screw seat A needle seat is set inside the needle seat, the upper end of the needle is fastened to the needle seat, the upper end surface of the needle seat is lower than the upper end surface of the spiral seat and forms a gap, the upper end of the needle communicates with the gap, The upper cover of the screw seat in the preserved state is equipped with a cap, the lower part of the cavity of the core rod is provided with a limit sleeve, and the two ends of the spring are mounted on the bottom end surface of the needle seat and the limit sleeve respectively. On the upper end surface, the center of the limiting sleeve is provided with a sleeve hole, and a sleeve is set in the sleeve hole, and the needle extends to the upper end surface of the piston after passing through the sleeve. The needle tip of the needle is not in contact with the upper end surface of the piston, the cap is separated from the screw seat when mixing, the front cone of the solvent injector is inserted into the gap of the screw seat, and the solvent injector The liquid outlet hole communicates with the gap.

It is further characterized in that: the solvent injector specifically includes a core rod, an outer casing, a piston, and a plug, the inner cavity of the outer casing is equipped with the core rod, the front end of the core rod is sleeved with the piston, and the outer surface of the piston is The edge ring surface is close to the inner wall of the jacket, the front cone of the jacket is fitted with the plug, and a solvent cavity is formed between the lower end surface of the piston and the inner wall of the jacket below it;

The upper outer end of the spiral seat is provided with an external thread, the inner wall of the mounting annulus of the front cone of the solvent injector is provided with an internal thread, and the mounting annulus of the solvent injector is threadedly connected to the spiral seat;

The needle seat is installed on the spiral seat through a limiting ring.

After using the structure of the present invention, the solute is filled in the solute solution chamber of the solute injector, the solvent is filled in the solvent injector, and the package is sterilized to be put on the market. Insert into the gap of the spiral seat, when the cone of the solvent syringe is inserted into the gap of the spiral seat, the cone of the solvent syringe pushes against the needle seat, the needle moves forward, the spring is compressed, and the needle tip is pushed forward to pass through the piston of the solute syringe Enter the solute dissolution chamber, push the solvent injector, the solvent enters the solute dissolution chamber through the needle, the solvent in the solute dissolution chamber increases continuously, and the jacket moves forward relative to the core rod to increase the volume under the internal pressure of the solute dissolution chamber, and the injection is completed Finally, unplug the solvent syringe, cover the cap, vibrate the solute syringe to mix the solvent and solute evenly in the mixed medicine prefilled syringe, unscrew the stopper, push the core rod to discharge the gas in the solute solution cavity, and immediately inject the injector. Throw away immediately afterwards, and its structure is simple, and solute and solvent filling are simple, and production cost is low, and mass production is easy to realize.

Description of drawings

Fig. 1 is the sectional structure schematic diagram under the mixed state of the present invention;

Fig. 2 is a schematic diagram of the front view of the solute injector of the present invention.

Detailed ways

See Fig. 1, Fig. 2, it comprises solute injector 1, solvent injector 2, and solute injector 1 specifically comprises core rod 3, outer jacket 4, piston 5, stopper 6, and the inner chamber of outer jacket 4 is equipped with core rod 3, and the inner chamber of core rod 3 The front end is covered with a piston 5, the outer ring surface of the piston 5 is close to the inner wall of the outer jacket 4, a solute solution cavity 7 is formed between the lower end surface of the piston 5 and the inner wall of the lower outer jacket 4, and the front outlet of the outer jacket 4 is set with a plug 6, The top of the core rod 3 of the solute injector 1 is provided with an inner ring slot 8, the lower end of the screw seat 9 is clipped in the inner ring slot 8, the inside of the screw seat 9 is fitted with a needle seat 10, and the upper end of the needle 11 is fastened and installed In the needle seat 10, the upper end surface of the needle seat 10 is lower than the upper end surface of the screw seat 9, and a gap 12 is formed, the upper end of the needle 11 is connected to the gap 12, and the upper cover of the screw seat 9 in the preserved state is equipped with a cap 13, and the core rod The lower part of the cavity of 3 is provided with a limit sleeve 14, and the two ends of the spring 15 are mounted on the bottom end surface of the needle holder 10 and the upper end surface of the limit sleeve 14 respectively. The center of the limit sleeve 14 is provided with a sleeve hole 16, and the sleeve A sleeve 17 is set inside the hole 16, and the needle 11 extends to the upper end surface of the piston 5 after penetrating the sleeve 17. The needle tip 18 of the needle 11 in the storage state does not touch the upper end surface of the piston 5, and the cap 13 is separated from the screw seat 9 when mixing. , the front cone 19 of the solvent injector 2 is inserted into the gap 12 of the screw seat 9 , and the outlet hole 20 of the solvent injector 2 communicates with the gap 12 . The needle holder 10 is installed on the screw seat 9 through the limiting ring 27 .

The solvent injector 2 specifically includes a core rod 21, a jacket 22, a piston 23, and a plug (not shown in the figure, which belongs to an existing mature structure). , the outer edge annulus of piston 23 is close to the inwall of overcoat 22, and the front end taper head 19 of overcoat 22 is sheathed with plug, and the solvent solution chamber 24 is formed between the lower end face of piston 23 and the inwall of overcoat 22 of its bottom; The outer end of the upper part is provided with an external thread 25 , and the inner wall of the installation ring surface 26 of the front cone 19 of the solvent injector 2 is provided with an internal thread, and the installation ring surface 26 of the solvent injector 2 is threadedly connected to the screw seat 9 .

Claims (4)

1. mixed medicine pre-encapsulated injector, it comprises solute syringe, solvent syringe, described solute syringe specifically comprises the first core bar, the first overcoat, first piston, the first stopper, the inner chamber of described the first overcoat is equipped with described the first core bar, the front end sleeve of described the first core bar is equipped with described first piston, the outer rim anchor ring of described first piston is close to the inwall of described the first overcoat, between the inwall of described first overcoat of the lower surface of described first piston and its underpart, form the molten chamber of solute, the front end exit of described the first overcoat is set with described the first stopper, it is characterized in that: the top of the first core bar of described solute syringe is provided with internal ring draw-in groove, the lower end of spiral base is fastened in described internal ring draw-in groove, the internal sleeve of described spiral base is equipped with needle stand, the upper end of pin is fastening is installed on described needle stand, described needle stand upper surface is lower than the upper surface of described spiral base, and form gap, the upper end of described pin is communicated to described gap, the upper cap of the described spiral base under preservation state is equipped with block, the cavity bottom of described the first core bar is provided with stop collar, the two ends of spring are mounted on respectively the bottom face of described needle stand, the upper surface of described stop collar, the center of described stop collar is provided with collar aperture, in described collar aperture, be set with sleeve pipe, described pin runs through the upper surface that extends described first piston after described sleeve pipe, the needle point of the described pin under preservation state does not contact with the upper surface of described first piston, described in when mixing, block departs from described spiral base, the front end conehead of described solvent syringe is plugged in the described gap of described spiral base, the liquid outlet of described solvent syringe is communicated with described gap.

2. mixed medicine pre-encapsulated injector according to claim 1, it is characterized in that: described solvent syringe specifically comprises the second core bar, the second overcoat, the second piston, the second stopper, the inner chamber of described the second overcoat is equipped with described the second core bar, the front end sleeve of described the second core bar is equipped with described the second piston, the outer rim anchor ring of described the second piston is close to the inwall of described the second overcoat, the front-end-cone headgear of described the second overcoat is equipped with described the second stopper, forms the molten chamber of solvent between the inwall of described second overcoat of the lower surface of described the second piston and its underpart.

3. mixed medicine pre-encapsulated injector according to claim 2, it is characterized in that: the outer end, top of described spiral base is provided with external screw thread, the installation anchor ring inwall of the front end conehead of described solvent syringe is provided with female thread, the installation anchor ring of the described solvent syringe described spiral base that is threaded.

4. mixed medicine pre-encapsulated injector according to claim 3, is characterized in that: described needle stand is installed on described spiral base by spacing ring.