CN109498910B

CN109498910B - Medical injector capable of preventing air flow pollution in use process

Info

Publication number: CN109498910B
Application number: CN201910035482.7A
Authority: CN
Inventors: 余志亮; 王颖颖
Original assignee: Nanchang Aimei Beauty Hospital Co ltd
Current assignee: Nanchang Aimei beauty hospital Co.,Ltd.
Priority date: 2019-01-15
Filing date: 2019-01-15
Publication date: 2021-03-19
Anticipated expiration: 2039-01-15
Also published as: CN109498910A; CN112827018B; CN112827018A

Abstract

The invention relates to the technical field of medical instruments and discloses a medical injector capable of preventing air flow pollution in the using process, which comprises a needle cylinder, wherein a needle head for taking liquid and injecting liquid is fixedly arranged on the right side of the needle cylinder, the needle head is mutually communicated with the right side surface of the needle cylinder, a first mounting block is sleeved on the left side surface of the needle cylinder in a threaded manner, a flow limiting box positioned in the inner cavity of the needle cylinder is fixedly arranged on the right side surface of the first mounting block, a first flow limiting plate and a second flow limiting plate for limiting the air flow rate are fixedly arranged on the inner wall of the flow limiting box from left to right in sequence, a rubber piston is movably sleeved in the inner cavity of the needle cylinder, and. This medical syringe of air current pollution is prevented in use through at the manual installation air inlet of getting liquid in-process for the inside disinfection air current of cylinder discharges the syringe outside, and forms the air current and can only advance the state that can not go out, has avoided the atmospheric pressure difference sudden change to cause the inside cavity of push jack to get into the outside air, provides the safety guarantee for follow-up notes liquid.

Description

Medical injector capable of preventing air flow pollution in use process

Technical Field

The invention relates to the technical field of medical instruments, in particular to a medical injector capable of preventing airflow pollution in the using process.

Background

The injector is an injection medical equipment for injecting fluid medicine to patient, and is formed from syringe, needle head and piston component, and the existent injector is generally placed in the sterile packaging cover before it is used, and the piston of the injector is positioned in the position nearest to needle head in the interior of syringe so as to reduce packaging volume of whole injector and can make medical personnel directly take liquid and inject it, however in the course of liquid injection, due to the movement of piston it can drive change of air volume of another side of piston to produce air pressure difference between interior and exterior of syringe, at the moment the external air flow of injector can be moved into interior of syringe, and the bacteria in the external air can be fed into syringe and contacted with injection liquor, so that it can raise the probability of contamination of injection liquor, and can raise the probability of infection.

Disclosure of Invention

The invention provides a medical injector capable of preventing airflow pollution in the using process, which has the advantage of preventing air bacteria from polluting injection liquid in the injecting process, and solves the problem that the air bacteria outside the existing injector enter the injector along with the airflow caused by the air pressure difference inside the injector to pollute the injection liquid in the using process of the existing injector.

The invention provides the following technical scheme: a medical injector preventing air current pollution in the using process comprises a needle cylinder, wherein a needle head used for taking liquid and injecting liquid is fixedly installed on the right side of the needle cylinder, the needle head and the right side face of the needle cylinder are communicated with each other, a first installation block is sleeved on the left side face of the needle cylinder in a threaded manner, a flow limiting box located in the inner cavity of the needle cylinder is fixedly installed on the right side face of the first installation block, a first flow limiting plate and a second flow limiting plate used for limiting the air flow rate are fixedly installed on the inner wall of the flow limiting box from left to right in sequence, a rubber piston is movably sleeved in the inner cavity of the needle cylinder, a connecting rod is fixedly installed on the right side face of the rubber piston, a pushing cylinder is fixedly installed on the right side face of the connecting rod, the left end of the pushing cylinder penetrates through the flow limiting box and the first installation block in;

the inner part of the push cylinder is a cavity, the volume of the cavity is two thirds of the volume of the inner cavity of the needle cylinder, the area of the right side surface of the push cylinder is larger than that of the connecting rod, vent holes positioned at the edge of the connecting rod are formed in the right side surface of the push cylinder, the number of the vent holes is eight, an alpha angle is formed between the first flow limiting plate and the inner wall of the flow limiting box, a beta angle is formed between the second flow limiting plate and the inner wall of the flow limiting box, a through hole matched with the push cylinder is formed in the right side surface of the flow limiting box, an elastic ring is arranged on the surface of the through hole, and the inner surface of the elastic ring is in.

Optionally, a second mounting block is fixedly mounted in the middle of the left side surface of the rubber piston, and a threaded hole matched with the right end of the vent hole is formed in the left side surface of the second mounting block.

Optionally, a first moving hole and a second moving hole which are convenient for the push cylinder to move are respectively arranged in the middle of the first flow limiting plate and the second flow limiting plate, and the cross-sectional area of the first moving hole is twice as large as that of the second moving hole.

Optionally, an angle α formed by the first restrictor plate and the restrictor box ranges from one hundred degrees to one hundred fifty degrees, an angle β formed by the second restrictor plate and the restrictor box ranges from fifty degrees to one hundred degrees, and a difference between the angle α and the angle β is fifty degrees.

Optionally, the cross section of the air inlet is half of the size of a thumb, and a rubber sleeve is mounted at the edge of the top of the air inlet.

Optionally, the distance from the air inlet to the rubber piston is consistent with the length value of the syringe.

Optionally, the rubber piston is formed by fusing five rubber rings at high temperature, the rubber ring positioned at the leftmost side is white, and the rest rubber rings are traditional black.

Optionally, the flow limiting box is funnel-shaped, and the area of the right side of the flow limiting box is smaller than the area of the left side of the flow limiting box.

The invention has the following beneficial effects:

1. this medical syringe of air current pollution is prevented in use through at the manual installation air inlet of getting liquid in-process for the inside disinfection air current of cylinder discharges the syringe outside, and forms the air current and can only advance the state that can not go out, has avoided the atmospheric pressure difference sudden change to cause the inside cavity of push jack to get into the outside air, provides the safety guarantee for follow-up notes liquid.

2. This medical injector that air current pollutes is prevented in use, carry out the secondary speed limit to the air current that gets into the cylinder inside through first installation piece through setting up alpha angle and beta angle, very big reduction the velocity of flow of this process air current, make annotating the liquid in-process, loosen the air inlet, the velocity of flow of air current is far greater than the gas velocity of flow that gets into the cylinder from first installation piece in the gas passage of air inlet and vent hole formation, make the supplementary gas flow that gets into the cylinder inner chamber be the aseptic air current of initial condition, thereby make annotate the unable inner chamber that gets into the cylinder of external air current in the liquid process, guaranteed that the injection is in aseptic condition all the time, then reduced the probability that the infection appears in the injection process.

3. This medical injector that air current pollution is prevented in use through setting up the second installation piece for at this injector in-process of assembly, only need earlier place the rubber piston in the inside of cylinder, first installation piece and current-limiting box have finally been assembled, will push away the inside of a section of thick bamboo disect insertion cylinder and aim at the second installation piece rotatory can, very big simplification the assembly of piston with the push rod, increased the feasibility and the high efficiency of the production assembly of the device.

4. This medical injector that air current pollutes is prevented in use through setting up the rubber sleeve for medical personnel's rubber gloves can form a sealed rubber mechanism with the rubber sleeve, very big assurance can not be because of the leading-in outside gas of pressure change at getting liquid process whole pusher, has increased the device's practicality.

5. This medical injector that air current pollutes is prevented in use through setting up the outside that the air inlet is in the cylinder all the time, has guaranteed that the part that rubber sleeve and medical personnel's hand got into can not get into the inside of cylinder to avoided getting into the inside of cylinder because the bacterium on the medical gloves causes the problem of pollution to the injection, guaranteed the safety of whole device operation process.

6. This medical syringe that air current pollution was prevented in use, through setting the piston to a plurality of rubber circles, thereby form the multilayer and strengthen sealed mechanism, thereby the probability of injection and the left air contact of piston has been reduced, the contaminated probability of injection has been reduced, set the rubber circle to two sets of colours simultaneously, the volume of getting liquid has been observed in the removal of having made things convenient for will personnel cooperation piston, the accurate nature of getting liquid has been guaranteed, the problem of getting liquid in-process through the syringe needle with the leading-in cylinder of outside air current has been avoided.

Drawings

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

FIG. 2 is a schematic view of a current limiting box according to the present invention;

FIG. 3 is a schematic diagram of a right view of the current limiting box according to the present invention;

FIG. 4 is a schematic view of the structure of the joint between the push cylinder and the connecting rod according to the present invention;

FIG. 5 is a schematic top view of a push cylinder according to the present invention;

FIG. 6 is an enlarged view of the structure at the position A of the present invention.

In the figure: 1. a needle cylinder; 11. a needle head; 2. a push cylinder; 21. a vent hole; 22. a connecting rod; 23. a rubber piston; 24. an air inlet; 25. a second mounting block; 26. a rubber sleeve; 3. a push block; 4. a first mounting block; 41. a first restrictor plate; 42. a second restrictor plate; 43. a current limiting box; 44. an elastic ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, a medical injector preventing air current pollution during use comprises a syringe 1, a needle 11 for taking liquid and injecting liquid is fixedly installed on the right side of the syringe 1, the needle 11 is communicated with the right side of the syringe 1, a first installation block 4 is sleeved on the left side of the syringe 1 in a threaded manner, a current limiting box 43 located in the inner cavity of the syringe 1 is fixedly installed on the right side of the first installation block 4, a first current limiting plate 41 and a second current limiting plate 42 for limiting air flow rate are fixedly installed on the inner wall of the current limiting box 43 from left to right in sequence, a rubber piston 23 is movably sleeved in the inner cavity of the syringe 1, a second installation block 25 is fixedly installed in the middle of the left side of the rubber piston 23, a threaded hole matched with the right end of the vent 21 is formed in the left side of the second installation block 25, and the second installation block 25 is arranged, so that during assembly of the injector, the rubber piston 23 is only placed, finally, the first mounting block 4 and the current-limiting box 43 are assembled, the push cylinder 2 is directly inserted into the needle cylinder 1 and is aligned with the second mounting block 25 to rotate, the assembly of the piston and the push rod is greatly simplified, the feasibility and the high efficiency of the production assembly of the device are increased, the connecting rod 22 is fixedly mounted on the right side surface of the rubber piston 23, the rubber piston 23 is formed by five rubber rings which are fused at high temperature, the rubber ring positioned on the leftmost side is white, and the rest rubber rings are in traditional black shapes, the piston is arranged into a plurality of rubber rings, so that a multi-layer sealing strengthening mechanism is formed, the probability of contact between injection and air on the left side of the piston is reduced, the probability of pollution of the injection is reduced, meanwhile, the rubber rings are arranged into two groups of colors, the convenience is brought for a user to observe the volume of liquid taking by matching with the movement of the piston, the accuracy of the liquid taking is ensured, and the problem that external air flow is guided into the needle cylinder 1, the right side surface of the connecting rod 22 is fixedly provided with the push cylinder 2, the left end of the push cylinder 2 sequentially penetrates through the flow limiting box 43 and the first mounting block 4 and is fixedly provided with the push block 3 positioned outside the needle cylinder 1, the top of the push cylinder 2 is provided with the air inlet 24, the cross section of the air inlet 24 is half of the size of the thumb, the edge of the top of the air inlet 24 is provided with the rubber sleeve 26, the rubber glove of a medical worker and the rubber sleeve 26 can form a sealed rubber mechanism by arranging the rubber sleeve 26, the whole push cylinder 2 can not lead in external air due to pressure change in the liquid taking process, the practicability of the device is increased, the distance from the air inlet 24 to the rubber piston 23 is consistent with the length value of the needle cylinder 1, the air inlet 24 is always positioned outside the needle cylinder 1, and the part of the rubber sleeve 26 entering the hand of the medical worker can not enter the needle cylinder 1, thereby avoiding the problem of pollution to the injection liquid caused by the bacteria on the medical gloves entering the inside of the needle cylinder 1 and ensuring the safety of the whole device in the operation process;

the inner part of the push cylinder 2 is a cavity, the volume of the cavity is two thirds of the volume of the inner cavity of the syringe 1, the area of the right side surface of the push cylinder 2 is larger than that of the connecting rod 22, the right side surface of the push cylinder 2 is provided with vent holes 21 positioned at the edge of the connecting rod 22, the number of the vent holes 21 is eight, the first restrictor plate 41 and the inner wall of the restrictor box 43 form an alpha angle, the second restrictor plate 42 and the inner wall of the restrictor box 43 form a beta angle, the middle parts of the first restrictor plate 41 and the second restrictor plate 42 are respectively provided with a first moving hole and a second moving hole which are convenient for the push cylinder 2 to move, the cross section area of the first moving hole is twice of that of the second moving air cross section, the range of the alpha angle formed by the first restrictor plate 41 and the restrictor box 43 is fifty degrees to one hundred degrees, the range of the beta angle formed by the second restrictor plate 42 and the restrictor box 43 is from one hundred degrees, the difference between the alpha angle and the beta angle is fifty degrees, and the secondary speed limitation is performed on the air flow, the velocity of flow of this process air current has greatly been reduced, make in annotating the liquid process, loosen air inlet 24, the velocity of flow of air current is far greater than the gas velocity of flow that gets into in the cylinder 1 from first installation piece 4 in the gas passage that air inlet 24 and air vent 21 formed, make the benefit of getting into the cylinder 1 inner chamber to aerify the air current for initial condition, thereby make annotate the liquid in-process external air current unable inner chamber that gets into cylinder 1, guaranteed that the injection liquid is in aseptic condition all the time, and then the probability of infection appears in the reduction injection process, the through-hole with pushing away a 2 looks adaptation is seted up to the right flank of current-limiting box 43, and the surface mounting of through-hole has elastic ring 44, current-limiting box 43 is hopper-shaped, and the area of the right flank of current-limiting box 43 is less than the area of the left surface of current-limiting box.

When in use: in the initial state, the rubber piston 23 is positioned at the rightmost side of the inner cavity of the needle cylinder 1, the air inlet 24 is positioned at the left side of the first mounting block 4 at the moment, and the air in the inner part of the needle cylinder 1 and the air in the cavity of the push cylinder 2 are sterilized into sterile air;

taking out the syringe from the sterile package in a liquid pumping state, inserting the needle 11 into the liquid medicine bottle, then pressing the finger wearing gloves on the air inlet 24 to enable the rubber sleeve 26 and the rubber gloves to be in a sealing state, pulling the air inlet 24 to move right, taking out a preset medicament according to the scale outside the syringe, and at the moment, moving the rubber piston 23 to the left inside the syringe 1 to enable the air flow inside the syringe 1 to be slowly discharged outside through the first mounting block 4;

and in the liquid injection state, the needle 11 is inserted into a preset injection position, fingers are released from the air inlet 24, then the push block 3 is pushed, the rubber piston 23 moves rightwards, the air flow rate of the air inlet 24 and the air vent 21 which are communicated with the inner cavity of the needle cylinder 1 is higher than the air flow rate of the air which enters the inner cavity of the needle cylinder 1 from the first mounting block 4, finally, clean air in the inner cavity of the push cylinder 2 is supplemented into the inner cavity of the needle cylinder 1, and finally, the injection is finished.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A medical injector preventing air flow pollution in use comprises a syringe (1), and is characterized in that: the right side fixed mounting of cylinder (1) has syringe needle (11) that is used for getting liquid and annotate the liquid, syringe needle (11) and cylinder (1) right flank communicate with each other, the left flank screw thread cover of cylinder (1) is equipped with first installation piece (4), the right flank fixed mounting of first installation piece (4) has current limiting box (43) that is located the cylinder (1) inner chamber, the inner wall of current limiting box (43) is from a left side to the right side fixed mounting in proper order has first current limiting plate (41) and second current limiting plate (42) that are used for limiting air flow rate, the inner chamber movable sleeve of cylinder (1) is equipped with rubber piston (23), the right flank fixed mounting of rubber piston (23) has connecting rod (22), the right flank fixed mounting of connecting rod (22) has push tube (2), the left end of push tube (2) runs through current limiting box (43) and first installation piece (4) in proper order and fixed mounting has push block (3) that are located the cylinder (1) outside, the top of the push cylinder (2) is provided with an air inlet (24); the inner part of the push cylinder (2) is a cavity, the volume of the cavity is two thirds of the volume of the inner cavity of the needle cylinder (1), the area of the right side surface of the push cylinder (2) is larger than that of the connecting rod (22), the right side surface of the push cylinder (2) is provided with vent holes (21) positioned at the edge of the connecting rod (22), the number of the vent holes (21) is eight, the first current limiting plate (41) and the inner wall of the current limiting box (43) form an alpha angle, the second current limiting plate (42) and the inner wall of the current limiting box (43) form a beta angle, the right side surface of the current limiting box (43) is provided with a through hole matched with the push cylinder (2), the surface of the through hole is provided with an elastic ring (44), and the inner surface of the elastic ring (44) is in friction connection with the outer surface of the.

2. A medical injector that is protected from airflow during use according to claim 1, wherein: the middle part of the left side surface of the rubber piston (23) is fixedly provided with a second mounting block (25), and the left side surface of the second mounting block (25) is provided with a threaded hole matched with the right end of the vent hole (21).

3. A medical injector that is protected from airflow during use according to claim 1, wherein: the middle parts of the first flow limiting plate (41) and the second flow limiting plate (42) are respectively provided with a first moving hole and a second moving hole which are convenient for the push cylinder (2) to move, and the cross section area of the first moving hole is twice of that of the second moving hole.

4. A medical injector that is protected from airflow during use according to claim 1, wherein: the first current limiting plate (41) and the current limiting box (43) form an alpha angle in the range of one hundred degrees to one hundred fifty degrees, the second current limiting plate (42) and the current limiting box (43) form a beta angle in the range of fifty degrees to one hundred degrees, and the difference between the alpha angle and the beta angle is fifty degrees.

5. A medical injector that is protected from airflow during use according to claim 1, wherein: the cross section of the air inlet (24) is half of the size of a thumb, and a rubber sleeve (26) is arranged at the edge of the top of the air inlet (24).

6. A medical injector that is protected from airflow during use according to claim 1, wherein: the distance between the air inlet (24) and the rubber piston (23) is consistent with the length value of the needle cylinder (1).

7. A medical injector that is protected from airflow during use according to claim 1, wherein: the rubber piston (23) is formed by fusing five rubber rings at high temperature, the rubber ring positioned at the leftmost side is white, and the rest rubber rings are traditional black.

8. A medical injector that is protected from airflow during use according to claim 1, wherein: the flow limiting box (43) is funnel-shaped, and the area of the right side surface of the flow limiting box (43) is smaller than the area of the left side surface of the flow limiting box (43).