CN113440689A - Syringe with telescopic liquid medicine container - Google Patents

Abstract

An injector with a telescopic liquid medicine container comprises a liquid medicine container, a needle cylinder, a core rod and a piston; the liquid medicine container comprises a needle seat joint part, a telescopic part and a core rod connecting part which are sequentially arranged from front to back along the axis of the needle cylinder, the rear part of the needle seat joint part is connected with the front end of the needle cylinder, the telescopic part and the core rod connecting part are positioned in the needle cylinder, the rear end of the telescopic part is sealed by the core rod connecting part, the core rod connecting part is connected with the front end of the core rod and is abutted by a piston arranged on the front end of the core rod, and the telescopic part is pulled back along with the core rod to be elongated and is compressed by the piston along with the pushing of the core rod. The syringe can directly suck and inject liquid medicine by stretching the liquid medicine container, also can pre-place the liquid medicine in the liquid medicine container and inject the liquid medicine by compressing the liquid medicine container, realizes the function of sucking and injecting the liquid medicine by replacing a common piston syringe under the environment without silicone oil, and solves the defect of silicone oil residue. Also designs various connection modes between the liquid medicine container and the needle cylinder and between the liquid medicine container and the core rod.

Description

Syringe with telescopic liquid medicine container

Technical Field

The invention belongs to the technical field of syringes, and particularly relates to a syringe with a telescopic liquid medicine container.

Background

At present, in order to ensure that a piston smoothly moves in a needle cylinder and reduce the friction force between the inner side wall of the needle cylinder of the injector and the outer side wall of a rubber piston, silicone oil for lubrication is generally coated on the inner side wall of the needle cylinder or (and) the outer side wall of the rubber piston. The scheme ensures that the injection contains a certain amount of silicone oil during injection, but the silicone oil belongs to an inactive ingredient in medical use, and the silicone oil and the medicament may generate harmful substances to bring health hazards, thereby restricting the development of the piston type injector for replacing an aqueous medicament packaging material.

Disclosure of Invention

The present invention addresses the above-described problems by providing a syringe with a retractable medicinal solution container.

The purpose of the invention can be realized by the following technical scheme:

an injector with a telescopic liquid medicine container comprises a liquid medicine container, a needle cylinder, a core rod and a piston; the liquid medicine container comprises a needle seat joint part, a telescopic part and a core rod connecting part which are connected into a whole, the needle seat joint part, the telescopic part and the core rod connecting part are sequentially arranged from front to back along the axis of the needle cylinder, the rear part of the needle seat joint part is connected with the front end of the needle cylinder, the telescopic part and the core rod connecting part are located in the needle cylinder, the rear end of the telescopic part is sealed by the core rod connecting part, the core rod connecting part is connected with the front end of the core rod and is abutted by a piston arranged on the front end of the core rod, wherein the telescopic part is pulled back along with the core rod and is stretched and compressed by the piston along with the pushing of the core rod.

Preferably, the telescopic part of the medical liquid container is in a corrugated pipe shape with foldable pipe wall.

Preferably, the connection part of the core rod of the liquid medicine container is provided with a port which is opened backwards along the axis, the front end of the core rod is provided with a bulge matched with the port, and the connection mode of the port and the bulge is any one of threaded fit, snap fit and glue bonding.

Preferably, the device further comprises a needle seat and a needle tube.

Preferably, the rear end of the needle holder joint part of the liquid medicine container is provided with an external thread, and the inner wall of the front end of the needle cylinder is provided with a matched internal thread.

Preferably, the back end of the needle seat joint part of the liquid medicine container is provided with an inverted buckle with internal threads, and the outer wall of the front end of the needle cylinder is provided with matched external threads.

Preferably, the outer wall of the needle seat joint part of the liquid medicine container close to the rear end is provided with a plurality of anti-rotation protrusions arranged along the circumferential direction, the side wall of the front end of the needle cylinder inwards buckles the rear end of the needle seat joint part of the liquid medicine container, the tail end of the front end of the needle cylinder is clamped between the plurality of anti-rotation protrusions and the rear end of the outer wall of the needle seat joint part of the liquid medicine container, and the tail end of the front end is provided with a plurality of anti-rotation clamping grooves matched with the plurality of anti-rotation protrusions.

Preferably, the outer wall of the rear end of the needle seat joint part of the liquid medicine container is provided with a plurality of anti-rotation protrusions arranged along the circumferential direction, the inner wall of the front end of the needle cylinder is provided with a plurality of anti-rotation clamping grooves matched with the plurality of anti-rotation protrusions, the side wall part of the corresponding anti-rotation clamping groove of the front end of the needle cylinder is bent inwards in a thermal forming mode, and the plurality of anti-rotation protrusions of the needle seat joint part of the liquid medicine container are buckled.

Preferably, the outer wall of the needle seat joint part of the liquid medicine container close to the rear end is provided with a plurality of anti-rotation protrusions arranged along the circumferential direction, the front end side wall of the needle cylinder inwards buckles the rear end of the needle seat joint part of the liquid medicine container and extends to the position of the anti-rotation protrusions, the front end side wall of the needle cylinder is provided with a plurality of anti-rotation clamping grooves matched with the plurality of anti-rotation protrusions, the anti-rotation protrusions of the corresponding liquid medicine container needle seat joint part of the front end of the needle cylinder are inwards concave with the side wall part between the rear end through a thermal forming mode and clamped between the anti-rotation protrusions and the rear end of the needle seat joint part. More preferably, the front end of the syringe is provided with an external locking structure with an internal collar.

Compared with the prior art, the invention has the beneficial effects that: this syringe can directly draw and inject the liquid medicine through the flexible mode of liquid medicine container, also can directly arrange liquid medicine in the liquid medicine container in advance, extrudees away liquid medicine through compressing the liquid medicine container and injects, has realized replacing ordinary piston syringe to carry out the function that the liquid medicine absorbs the injection under no silicon oil environment, has solved the remaining defect of silicon oil on the ordinary piston syringe. Meanwhile, various connection modes between the liquid medicine container and the needle cylinder and between the liquid medicine container and the core rod are designed, and selection can be performed according to actual process conditions.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an exploded view of the present invention;

FIG. 3 is another overall structure diagram of the present invention;

FIG. 4 is a schematic view of the structure of the chemical liquid container according to the present invention;

FIG. 5 is a schematic view of the structure of the liquid pumping device according to the present invention;

FIG. 6 is a schematic view of the structure of an injection using the present invention;

FIG. 7 is a schematic view of the connection between the medical fluid container and the internal thread of the syringe in the present invention;

FIG. 8 is a schematic view of the connection between the medical fluid container and the external thread of the cylinder according to the present invention;

FIG. 9 is a schematic view of the structure of the snap-fit connection between the medical solution container and the syringe in the present invention;

FIG. 10 is a schematic view showing the structure of the liquid medicine container of the present invention in which the cylinder is coupled to the liquid medicine container by thermoforming;

FIG. 11 is another schematic view of the connection between the medical fluid container and the cylinder by thermoforming in accordance with the present invention;

FIG. 12 is a schematic view showing still another structure of the present invention in which the medical fluid container and the cylinder are coupled by thermoforming;

FIG. 13 is a schematic view of the structure of the threaded connection between the liquid medicine container and the stem in the present invention;

FIG. 14 is a schematic view of the structure of the liquid medicine container and the core rod of the present invention in snap-fit connection;

FIG. 15 is a schematic view of the structure of the glue-bonding between the liquid medicine container and the core pin according to the present invention.

The reference numbers are as follows:

1 medicinal liquid container

101 needle seat joint part

1011 external screw thread

1012 back-off with internal thread

1013 anti-rotation projection

1014 anti-rotation bulge

1015 anti-rotation projection

102 expansion part

103 core bar connecting part

1031 interface

1032 fastener

2 needle cylinder

201 internal screw thread

202 external thread

203 anti-rotation clamping groove

204 anti-rotation clamping groove

205 external locking structure with internal collar

3 core bar

301 projection

4 piston

5 needle seat

6 needle tube

7 thermal forming die

8, glue.

Detailed Description

The following detailed description of the embodiments of the present invention will be given in conjunction with the accompanying drawings to make it clear to those skilled in the art how to practice the present invention. While the invention has been described in connection with preferred embodiments thereof, these embodiments are merely illustrative, and not restrictive, of the scope of the invention.

Referring to fig. 1 to 3, an injector with a retractable medical fluid container mainly includes a medical fluid container 1, a cylinder 2, a core bar 3, and a piston 4. The liquid medicine container 1 is installed in the front end of the needle cylinder 2 and the rear end thereof is connected with the front end of the core bar 3, and the piston 4 is installed on the front end of the core bar 3 and butts against the rear end of the liquid medicine container 1. The main difference from the prior art is that the liquid medicine container 1 is a telescopic structure of the liquid medicine container 1.

Referring to fig. 4, the medical fluid container 1 includes a hub adapter 101, a telescopic portion 102, and a stem connecting portion 103, which are integrally connected in this order from front to back along the axis. The hub adapter 101 is tapered with a small front and a large rear to form a male luer adapter for mating with the interior cavity of the hub 5. The telescopic part 102 is in a bellows shape with a foldable pipe wall, the front end of the telescopic part 102 is connected with the rear end of the needle seat joint part 101, the rear end of the telescopic part 102 is connected with the core rod connecting part 103, and the inside of the telescopic part 102 is communicated with the inside of the needle seat joint part 101. The stem connecting part 103 closes the rear end of the expansion part 102, and the stem connecting part 103 is provided with an interface 1031 which is opened along the axis to the rear so as to match with a projection 301 formed at the front end of the stem 3 to realize the connection of the liquid medicine container 1 and the stem 3.

The syringe of the telescopic medical fluid container 1 may further include a needle holder 5 and a needle tube 6 mounted on the needle holder 5.

Referring to fig. 5, when drawing the liquid, the core rod 3 is pulled back, the core rod 3 drives the core rod connecting part 103 of the liquid medicine container 1, so that the expansion part 102 of the liquid medicine container 1 is expanded, and the liquid is sucked into the inner cavity of the needle holder 5 and the needle holder joint part 101 and the expansion part 102 of the liquid medicine container 1 through the needle tube 6.

Referring to fig. 6, during injection, the core rod 3 is pushed, the core rod 3 drives the piston 4 to press against the core rod connecting part 103 of the medical fluid container 1, so that the telescopic part 102 of the medical fluid container 1 is folded and compressed, and the liquid in the inner cavity of the needle holder 5 and the needle holder joint part 101 and the telescopic part 102 of the medical fluid container 1 is discharged through the needle tube 6.

In addition, the drug solution container 1 and the cylinder 2 have various connection methods.

Referring to fig. 7, one way of connecting the medical fluid container 1 to the cylinder 2: the rear end of the needle seat joint part 101 of the liquid medicine container 1 is provided with an external thread 1011, the front end inner wall of the needle cylinder 2 is provided with an internal thread 201, and the needle seat joint part 101 of the liquid medicine container 1 is matched with the front end inner wall of the needle cylinder 2 through threads to realize the connection of the liquid medicine container 1 and the needle cylinder 2.

Referring to fig. 8, one way of connecting the medical fluid container 1 to the cylinder 2: the back end of the needle seat joint part 101 of the liquid medicine container 1 is provided with an inverse buckle 1012 with internal threads, the outer wall of the front end of the needle cylinder 2 is provided with external threads 202, and the inverse buckle 1012 with the internal threads of the needle seat joint part 101 of the liquid medicine container 1 is in threaded fit with the outer wall of the front end of the needle cylinder 2 to realize the connection of the liquid medicine container 1 and the needle cylinder 2.

Referring to fig. 9, one way of connecting the medical fluid container 1 to the cylinder 2: the outer wall of the needle seat joint part 101 of the liquid medicine container 1 close to the rear end is provided with a plurality of anti-rotation protrusions 1013 arranged along the circumferential direction, the front end side wall of the needle seat joint part 101 of the liquid medicine container 1 is buckled inwards at the rear end of the needle seat joint part 101 of the liquid medicine container 1, the front end of the needle cylinder 2 is clamped between the plurality of anti-rotation protrusions 1013 and the rear end of the outer wall of the needle seat joint part 101 of the liquid medicine container 1, and the front end is provided with a plurality of anti-rotation clamping grooves 203 matched with the plurality of anti-rotation protrusions 1013, so that the connection of the liquid medicine container 1 and the needle cylinder 2 is realized, and the relative rotation between the liquid medicine container 1 and the needle cylinder 2 is prevented.

Referring to fig. 10, one way of connecting the medical fluid container 1 to the cylinder 2: the outer wall of the rear end of the needle seat joint part 101 of the liquid medicine container 1 is provided with a plurality of anti-rotation bulges 1014 arranged along the circumferential direction, the inner wall of the front end of the needle cylinder 2 is provided with a plurality of anti-rotation clamping grooves 204 matched with the anti-rotation bulges 1014, and each anti-rotation clamping groove 204 extends to the front end surface of the needle cylinder 2 so that the anti-rotation bulges 1014 can be clamped in from front to back; after the anti-rotation protrusions 1014 are engaged into the anti-rotation slots 204, the sidewall portion of the front end of the syringe 2 corresponding to the anti-rotation slots 204 is bent inward in a thermoforming manner and fastened to the anti-rotation protrusions 1014 of the hub connector 101 of the medical fluid container 1 in cooperation with the thermoforming mold 7. In this way, the connection between the drug solution container 1 and the cylinder 2 is achieved, and the relative rotation between the two is prevented.

Referring to fig. 11, one way of connecting the medical fluid container 1 to the cylinder 2: the outer wall of the needle seat joint part 101 of the liquid medicine container 1 close to the rear end is provided with a plurality of anti-rotation protrusions 1015 arranged along the circumferential direction, the side wall of the front end of the needle cylinder 2 is inwards buckled with the rear end of the needle seat joint part 101 of the liquid medicine container 1 and extends to the positions of the anti-rotation protrusions 1015, and the side wall of the front end of the needle cylinder 2 is provided with a plurality of anti-rotation clamping grooves matched with the anti-rotation protrusions 1015; the side wall portion of the front end of the cylinder 2 corresponding to the space between the anti-rotation projection 1015 and the rear end of the hub adapter portion 101 of the medical fluid container 1 is recessed and caught between the anti-rotation projection 1015 and the rear end of the hub adapter portion 101 by means of thermoforming, see the change from the left portion to the right portion of fig. 11. In this way, the connection between the drug solution container 1 and the cylinder 2 is achieved, and the relative rotation between the two is prevented.

Referring to fig. 12, one way of connecting the medical fluid container 1 to the cylinder 2: the front end of the syringe 2 is provided with an external locking structure 205 with an internal collar, and the other structures are the same as the connection mode of the liquid medicine container 1 and the syringe 2 shown in fig. 11, and are not described again.

The drug solution container 1 and the stem 3 have various connection means as well.

Referring to fig. 13, one way of connecting the drug solution container 1 to the stem 3 is: an internal thread is arranged in the interface 1031 of the core rod connecting part 103 of the liquid medicine container 1, an external thread is arranged on the bulge 301 at the front end of the core rod 3, and the interface 1031 of the core rod connecting part 103 of the liquid medicine container 1 is in threaded fit with the bulge 301 at the front end of the core rod 3 to realize the connection of the liquid medicine container 1 and the core rod 3.

Referring to fig. 14, one way of connecting the medical fluid container 1 to the stem 3 is: a buckle 1032 is arranged in the interface 1031 of the core bar connecting part 103 of the liquid medicine container 1, and the interface 1031 is in snap fit with the bulge 301 at the front end of the core bar 3 to realize the connection of the liquid medicine container 1 and the core bar 3.

Referring to fig. 15, one way of connecting the drug solution container 1 to the stem 3 is: the interface 1031 of the stem connecting part 103 of the liquid medicine container 1 is inserted into the protrusion 301 at the front end of the stem 3, and is bonded by the glue 8 to realize the connection between the liquid medicine container 1 and the stem 3.

It should be noted that many variations and modifications of the embodiments of the present invention fully described are possible and are not to be considered as limited to the specific examples of the above embodiments. The above examples are given by way of illustration of the invention and are not intended to limit the invention. In conclusion, the scope of the present invention should include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art.

Claims (10)

1. An injector with a telescopic liquid medicine container is characterized by comprising the liquid medicine container, a needle cylinder, a core rod and a piston; the liquid medicine container comprises a needle seat joint part, a telescopic part and a core rod connecting part which are connected into a whole, the needle seat joint part, the telescopic part and the core rod connecting part are sequentially arranged from front to back along the axis of the needle cylinder, the rear part of the needle seat joint part is connected with the front end of the needle cylinder, the telescopic part and the core rod connecting part are located in the needle cylinder, the rear end of the telescopic part is sealed by the core rod connecting part, the core rod connecting part is connected with the front end of the core rod and is abutted by a piston arranged on the front end of the core rod, wherein the telescopic part is pulled back along with the core rod and is stretched and compressed by the piston along with the pushing of the core rod.

2. The syringe with retractable medical liquid container as claimed in claim 1, wherein the retractable part of the medical liquid container has a bellows shape with a wall foldable.

3. The syringe with retractable medical fluid container as claimed in claim 1, wherein the connection portion of the core rod of the medical fluid container is provided with a port opened backward along the axis, the front end of the core rod is provided with a protrusion engaged with the port, and the port and the protrusion are connected by any one of screw-thread engagement, snap-fit engagement and glue-bonding.

4. The syringe with retractable medical fluid container as claimed in claim 1, further comprising a needle holder and a needle tube.

5. The syringe with retractable medical fluid container as claimed in any one of claims 1 to 4, wherein the rear end of the hub of the medical fluid container is provided with external threads, and the inner wall of the front end of the cylinder is provided with mating internal threads.

6. An injector with a retractable medical liquid container as claimed in any one of claims 1 to 4, wherein the rear end of the connector part of the needle holder of the medical liquid container is provided with an inverted buckle with internal thread, and the outer wall of the front end of the needle cylinder is provided with a matched external thread.

7. The syringe with retractable medical fluid container as claimed in any one of claims 1 to 4, wherein the outer wall of the needle hub connector of the medical fluid container near the rear end is provided with a plurality of anti-rotation protrusions arranged along the circumferential direction, the front end side wall of the needle cylinder inwardly buckles the rear end of the needle hub connector of the medical fluid container, the front end of the needle cylinder is clamped between the anti-rotation protrusions and the rear end of the outer wall of the needle hub connector of the medical fluid container, and the front end is provided with a plurality of anti-rotation clamping grooves matched with the anti-rotation protrusions.

8. The syringe with retractable medical fluid container as claimed in any one of claims 1 to 4, wherein the outer wall of the rear end of the hub connector of the medical fluid container is provided with a plurality of anti-rotation protrusions arranged along the circumferential direction, the inner wall of the front end of the needle cylinder is provided with a plurality of anti-rotation locking grooves engaged with the plurality of anti-rotation protrusions, and the side wall portion of the front end of the needle cylinder corresponding to the anti-rotation locking grooves is bent inward by means of thermoforming to fasten the plurality of anti-rotation protrusions of the hub connector of the medical fluid container.

9. The syringe with the retractable medical fluid container as claimed in any one of claims 1 to 4, wherein the outer wall of the needle hub joint of the medical fluid container near the rear end is provided with a plurality of anti-rotation protrusions arranged along the circumferential direction, the front end side wall of the needle cylinder inwardly buckles the rear end of the needle hub joint of the medical fluid container and extends to the positions of the anti-rotation protrusions, the front end side wall of the needle cylinder is provided with a plurality of anti-rotation slots matched with the anti-rotation protrusions, and the side wall portion of the front end of the needle cylinder, corresponding to the anti-rotation protrusion of the medical fluid container needle hub joint, between the anti-rotation protrusion and the rear end is recessed by means of thermoforming and clamped between the anti-rotation protrusion and the rear end of the needle hub joint.

10. Syringe with collapsible medical liquid container according to claim 9 characterized in that the front end of the barrel is provided with an outer locking structure with an inner collar.

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