CN204446607U - The molten syringe of a kind of pin type secondary filter - Google Patents

Abstract

The utility model relates to a needle-type precision filter dissolving drug injector, a main channel, a first auxiliary channel and a second auxiliary channel are arranged inside the second drug dissolving tube; the first port of the main channel is connected with a drug dissolving cavity, and the second drug dissolving tube is The two ports communicate with the injection needle; the first port of the first auxiliary channel communicates with the drug-dissolving cavity, and its second port meets the main channel; the first port of the second auxiliary channel communicates with the drug-dissolving cavity, and its second port communicates with the drug-dissolving cavity. The main channels meet; the main one-way valve is installed on the first port of the main channel, the first secondary one-way valve is installed on the second port of the first secondary channel, and the second secondary one-way valve is installed on the second port of the first secondary channel. It is arranged on the second port of the second secondary channel; inside the dissolving chamber, there is a gap between the first port of the main channel to the first port of the first secondary channel and the first port of the second secondary channel. Space-separated precision filter membranes. The utility model can filter the liquid medicine and prevent the particles from causing harm to the patient's body.

Description

A needle-type precision filter drug-dissolving syringe

technical field

The utility model belongs to the field of medical equipment, in particular to a needle-type precision filter medicine-dissolving syringe capable of filtering medicine liquid.

Background technique

At present, most of the medicines used clinically are packaged in glass bottles. When the rubber stopper of the glass bottle is pierced with the needle of a syringe or the glass bottle is cut with a grinding wheel to extract the medicine, particles such as bottle stopper chips or glass powder are easily mixed into the medicine; In addition, due to improper artificial preservation or misoperation, it is also easy to cause insoluble particles in the liquid medicine. And because ordinary syringes do not have the filtering function, these particles will be injected into the patient's body together with the liquid medicine, causing various injuries to the patient's body. In mild cases, it may induce venous inflammation and other diseases, and in severe cases, it may even cause cancer.

Utility model content

The utility model aims at the problem that the ordinary syringe in the prior art does not have the filtering function, which causes the particles in the liquid medicine to cause harm to the patient's body, and provides a device that can effectively filter the particles in the liquid medicine to prevent it from causing harm to the body of the patient. Needle-type precision filter drug-dissolving syringe.

The utility model proposes a needle-type precision filter drug-dissolving syringe, which includes a push rod, a first drug-dissolving tube, a drug-dissolving cavity, a second drug-dissolving tube and an injection needle; In the first drug-dissolving tube, the first drug-dissolving tube communicates with the drug-dissolving cavity; the second drug-dissolving tube is provided with a main channel, a first sub-channel and a second sub-channel; the main channel The first port of the first secondary channel communicates with the drug-dissolving cavity, and its second port communicates with the injection needle; the first port of the first secondary channel communicates with the drug-dissolving cavity, and its second port meets the main channel ; The first port of the second secondary channel communicates with the drug-dissolving chamber, and the second port of the second channel meets the main channel;

The needle-type precision filter drug-dissolving syringe also includes a flexible one-way valve, and the flexible one-way valve includes a main one-way valve plate, a first secondary one-way valve plate and a second secondary one-way valve plate; the main one-way valve plate The valve plate is movably installed on the first port of the main channel, the first secondary one-way valve plate is movably installed on the second port of the first secondary channel, and the second secondary one-way valve plate is movably installed on the second port of the first secondary channel. The valve plate is movably installed on the second port of the second secondary channel; the opening direction of the main one-way valve plate and the first secondary one-way valve plate are opposite to the main channel; the second secondary The opening direction of the one-way valve plate and the first secondary one-way valve plate relative to the main channel is the same; the inside of the drug-dissolving cavity is provided with a precision filter membrane, and the precision filter membrane separates the inside of the drug-dissolving cavity from The space between the first port of the main channel and the first port of the first secondary channel is separated; and the precision filter membrane simultaneously separates the inside of the drug-dissolving cavity from the first The port is spaced apart from the first port of the second secondary channel.

Preferably, the main one-way valve plate can be opened in a direction away from the main channel; the first secondary one-way valve plate can be opened in a direction away from the first secondary channel; the second secondary one-way valve plate can be opened in a direction away from the first secondary channel; The valve plate can be opened in a direction away from the second secondary channel.

Preferably, the precision filter membrane divides the interior of the drug-dissolving chamber into a main chamber and a secondary chamber, and the main chamber communicates with the first drug-dissolving tube and the first port of the main channel respectively , the secondary chamber communicates with the first port of the first secondary channel and the first port of the second secondary channel respectively.

Preferably, the main one-way valve plate, the first secondary one-way valve plate and the second secondary one-way valve plate are integrally formed.

Preferably, the main one-way valve plate, the first secondary one-way valve plate and the second secondary one-way valve plate are silicone valve plates integrally formed.

Preferably, the first end of the first auxiliary one-way valve plate is connected to the main one-way valve plate, and the second end opposite to the first end is a free end; the first end of the second auxiliary one-way valve plate It is connected with the main one-way valve plate, and the second end opposite to the first end is a free end.

Preferably, when the main one-way valve plate, the first auxiliary one-way valve plate and the second auxiliary one-way valve plate move in a direction away from the main channel as a whole, the main one-way valve plate moves the The first port of the main channel is opened, the free end of the first secondary one-way valve plate closes the second port of the first secondary channel, and the free end of the second secondary one-way valve plate closes the second port The second port of the auxiliary passage is closed; when the main one-way valve, the first auxiliary one-way valve and the second auxiliary one-way valve move in a direction close to the main passage, the main one-way The valve plate closes the first port of the main channel, the free end of the first secondary one-way valve plate opens the second port of the first secondary channel, and the free end of the second secondary one-way valve plate Open the second port of the second secondary channel.

Preferably, a main valve port is formed between the first end of the main one-way valve plate, the first secondary one-way valve plate and the first end of the second secondary one-way valve plate; the main one-way valve plate, the second secondary one-way valve plate When the first one-way valve plate and the second one-way valve plate move in a direction away from the main channel as a whole, the main valve port at least partially enters the drug-dissolving cavity, so that the drug-dissolving cavity It communicates with the main passage; when the main one-way valve, the first auxiliary one-way valve and the second auxiliary one-way valve move in a direction close to the main passage, the main valve port enters In the main channel, the main one-way valve plate separates the drug dissolving cavity from the main channel.

Preferably, the main valve port is roughly V-shaped.

Beneficial effects: the needle-type precision filter drug-dissolving syringe proposed by the utility model can be opened along the direction away from the main channel with the main one-way valve, and the first secondary one-way valve can be opened along the direction away from the first secondary channel. The second pair of one-way valves can be opened in the direction away from the second auxiliary channel. For example, when extracting the liquid medicine, the liquid medicine is drawn to the main channel through the injection needle. At this time, the main one-way valve plate opens the second channel of the main channel. One port, the first one-way valve plate closes the second port of the first secondary channel, the second one-way valve plate closes the second port of the second secondary channel, and the liquid medicine will enter the solution through the first port of the main channel Inside the medicine chamber; when injecting the medicine liquid, the main one-way valve closes the first port of the main channel, the medicine liquid is filtered by the precision filter membrane, and the filtered medicine liquid will pass through the first port of the first auxiliary channel and enter the second In the first secondary channel, and through the first port of the second secondary channel into the second secondary channel, at this time, the first secondary one-way valve plate opens the second port of the first secondary channel, and the second secondary one-way valve plate opens The second port of the second secondary channel, the filtered medicinal liquid will flow into the main channel through the second port of the first secondary channel and the second port of the second secondary channel, and finally inject the drug solution without particles from the injection needle. The liquid medicine effectively prevents the particles from causing harm to the patient's body. The utility model has the advantages of simple and exquisite structure, convenient operation and high practicability.

Description of drawings

Fig. 1 is a schematic cross-sectional structural view of Embodiment 1 of a needle-type precision filter drug-dissolving syringe proposed by the utility model.

Fig. 2 is the A-A view of Fig. 1 .

Fig. 3 is a schematic cross-sectional structure diagram of the needle-type precision filter drug-dissolving syringe in Fig. 1 when extracting the drug solution.

Fig. 4 is a schematic cross-sectional structure diagram of Embodiment 2 of a needle-type precision filter drug-dissolving syringe proposed by the utility model.

In Fig. 1 to Fig. 3: 110-push rod, 120-first drug dissolving tube, 130-dissolving drug cavity, 131-precision filter membrane, 132-main chamber, 133-secondary chamber, 140-second dissolving chamber Drug tube, 141-main channel, 142-first auxiliary channel, 143-second auxiliary channel, 150-injection needle, 161-main one-way valve, 162-first one-way valve, 163-second One-way valve, 164-main valve port.

In Fig. 4: 210-push rod, 220-first drug dissolving tube, 230-drug dissolving chamber, 231-precision filter membrane, 232-main chamber, 233-sub chamber, 240-second drug dissolving tube, 241-main channel, 242-first auxiliary channel, 243-second auxiliary channel, 250-injection needle, 261-main one-way valve plate, 262-first auxiliary one-way valve plate, 263-second auxiliary one-way valve Slice, 264-main valve port.

Detailed ways

In order to facilitate the understanding of those skilled in the art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments.

Embodiment one:

Please refer to Fig. 1 and Fig. 2, a needle-type precision filter dissolving drug syringe proposed in this embodiment includes a push rod 110, a first drug dissolving tube 120, a drug dissolving cavity 130, a second drug dissolving tube 140 and an injection needle 150; the push rod 110 is movably installed in the first drug dissolving tube 120, and the first drug dissolving tube 120 communicates with the drug dissolving cavity 130; the inside of the second drug dissolving tube 140 A main channel 141, a first auxiliary channel 142, and a second auxiliary channel 143 are provided; the first port of the main channel 141 communicates with the drug-dissolving cavity 130, and the second port communicates with the injection needle 150; the second port communicates with the injection needle 150; The first port of a secondary channel 142 communicates with the drug-dissolving cavity 130, and its second port merges with the main channel 141; the first port of the second secondary channel 143 communicates with the drug-dissolving cavity 130, which A second port meets the main channel.

The needle-type precision filter dissolving drug injector also includes a flexible one-way valve, and the flexible one-way valve includes a main one-way valve plate 161, a first secondary one-way valve plate 162 and a second secondary one-way valve plate 163; The main one-way valve plate 161 is movably installed on the first port of the main channel 141, and the first secondary one-way valve plate 162 is movably installed on the second port of the first secondary channel 142, The opening direction of the main one-way valve plate 161 and the first auxiliary one-way valve plate 162 relative to the main passage 141 is opposite (the opening direction here refers to whether the two are far away from or close to the main passage 141 ); the opening direction of the second secondary one-way valve plate 163 and the first secondary one-way valve plate 162 relative to the main channel 141 is the same; the inside of the drug-dissolving cavity 130 is provided with a precision filter membrane 131, the The precision filter membrane 131 separates the space between the first port of the main channel 141 to the first port of the first secondary channel 142 inside the dissolving chamber 130; and the precision filter membrane 131 At the same time, the space inside the dissolving cavity 130 is separated from the first port of the main channel 141 to the first port of the second secondary channel 143 .

As shown in FIG. 1 and FIG. 3 , when the push rod 110 is pulled up, the liquid medicine can be extracted; when the push rod 110 is pushed down, the liquid medicine can be injected.

In this embodiment, the opening directions of the main one-way valve plate 161, the first secondary one-way valve plate 162 and the second secondary one-way valve plate 163 are opposite to the main channel 141, and the following scheme is specifically preferred: The main one-way valve plate 161 can be opened along the direction away from the main channel 141; the first secondary one-way valve plate 162 can be opened along the direction away from the first secondary channel 142 (as shown in FIG. That is, the first secondary check valve plate 162 can be opened along the direction close to the central axis of the main channel 141); the second secondary check valve plate 163 can be opened along the direction away from the second secondary channel 143 (according to FIG. 1 As shown, that is, the second secondary check valve plate 163 can also be opened in a direction close to the central axis of the main channel 141, so in this embodiment, the second secondary check valve plate 163 and the first secondary check valve plate 162 are relatively The opening direction of the main channel 141 is the same).

In the needle-type precision filter drug-dissolving syringe proposed in this embodiment, the second drug-dissolving tube 140 is provided with a main channel 141, a first auxiliary channel 142, and a second auxiliary channel 143; the first port of the main channel 141 communicates with the drug-dissolving chamber Body 130, the second port of which communicates with the injection needle 150; the first port of the first secondary channel 142 communicates with the dissolving chamber 130, and the second port of which merges with the main channel 141; the first port of the second secondary channel 143 communicates The drug-dissolving chamber 130, its second port merges with the main passage 141; the main one-way valve plate 161 is installed on the first port of the main passage 141, and the first secondary one-way valve plate 162 is installed on the first secondary one-way valve plate 162. On the second port of the passage 142, the second secondary one-way valve plate 163 is installed on the second port of the second secondary passage 143, and the main one-way valve plate 161 can be opened in a direction away from the main passage 141; The first secondary one-way valve plate 162 can be opened in a direction away from the first secondary channel 142; the second secondary one-way valve plate 163 can be opened in a direction away from the second secondary channel 143; The inside of the cavity 130 is provided with a precision filter membrane 131 (the precision filter membrane 131 is annular in this embodiment) that separates its interior from the first port of the main channel 141 to the first port of the first secondary channel 142. ), and the precision filter membrane 131 separates the space between the first port of the main channel 141 to the first port of the second secondary channel 143 inside the drug-dissolving cavity 130; when carrying out When extracting the medicinal liquid, the medicinal liquid is drawn into the main channel 141 through the injection needle 150. At this time, the main one-way valve plate 161 opens the first port of the main channel 141, and the first secondary one-way valve plate 162 closes the first secondary channel 142. The second port of the second sub-check valve plate 163 closes the second port of the second sub-channel 143, and the medical solution will enter the drug-dissolving cavity 130 through the first port of the main channel 141 (and the medical solution can reach the second port of the second secondary channel 143). in a drug-dissolving tube 120); when injecting medicinal liquid, the main one-way valve plate 161 at the first port of the main passage 141 closes the first port of the main passage 141, and the medicinal liquid is filtered by the precision filter membrane 131, filtered The final medical solution will enter the first secondary channel 142 through the first port of the first secondary channel 142, and enter the second secondary channel 143 through the first port of the second secondary channel 143. At this time, the first secondary unidirectional The valve plate 162 opens the second port of the first secondary channel 142, and the second secondary one-way valve plate 163 opens the second port of the second secondary channel 143, and the filtered medical solution will pass through the second port of the first secondary channel 142 and the second port of the second secondary channel 143. The second port of the second auxiliary channel 143 merges into the main channel 141 , and finally the drug solution without particles is injected from the injection needle 150 , which effectively prevents the particles from causing harm to the patient's body. This embodiment is simple and exquisite in structure, easy to operate and highly practical.

In order to better realize the purpose of this embodiment, this embodiment also makes the following optimizations:

In this embodiment, the precision filter membrane 131 divides the interior of the drug-dissolving cavity 130 into a main chamber 132 and a sub-chamber 133, and the main chamber 132 is connected to the first drug-dissolving tube 120 and the secondary chamber 133 respectively. The first port of the main channel 141 is connected, and the secondary chamber 132 is respectively connected with the first port of the first secondary channel 142 and the first port of the second secondary channel 143 .

In this embodiment, the main one-way valve plate 161 , the first secondary one-way valve plate 162 and the second secondary one-way valve plate 163 are preferably integrally formed, which can make the structure more delicate, compact and easy to implement. At the same time, the main one-way valve plate 161, the first secondary one-way valve plate 162 and the first secondary one-way valve plate 163 are all flexible one-way valve plates, so that when the liquid medicine is extracted, the liquid medicine enters from the injection needle 150 After the inside of the main channel 141, the main check valve plate 161 will be automatically flushed, and the first secondary check valve plate 162 and the second secondary check valve plate 163 will be compressed to close the second ports of the first secondary channel 142 respectively. and the second port of the second auxiliary channel 143; when injecting the liquid medicine, the liquid medicine will press the main one-way valve plate 161 to close the first port of the main channel 141, and automatically open the first secondary one-way valve plate 162 and the second secondary one-way valve plate 163, merge into the main channel 141, and finally inject it out from the injection needle 150. Specifically, the main one-way valve plate 161 , the first secondary one-way valve plate 162 , and the second secondary one-way valve plate 163 are preferably integrally formed silicone valve plates, which meet the characteristics of integral molding and flexibility.

Further, the first end of the first auxiliary one-way valve plate 162 is connected to the main one-way valve plate 161, and the second end opposite to the first end is a free end; the second end of the second auxiliary one-way valve plate 163 One end is connected with the main one-way valve plate 161, and the second end opposite to the first end is a free end.

When the main one-way valve plate 161 , the first auxiliary one-way valve plate 162 and the second auxiliary one-way valve plate 163 move in a direction away from the main channel 141 as a whole, the main one-way valve plate 161 will The first port of the main passage 141 is opened, the free end of the first auxiliary one-way valve plate 162 closes the second port of the first auxiliary passage 142, and the free end of the second auxiliary one-way valve plate 163 The end closes the second port of the second secondary channel 143; the main check valve plate 161, the first secondary check valve plate 162 and the second secondary check valve plate 163 are all along the main channel When moving in the direction of 141, the main one-way valve plate 161 closes the first port of the main channel 141, and the free end of the first secondary one-way valve plate 162 closes the second port of the first secondary channel 142. The port is opened, and the free end of the second secondary one-way valve plate 163 opens the second port of the second secondary channel 143 .

A main valve port 164 is formed between the main check valve plate 161, the first end of the first secondary check valve plate 162 and the first end of the second secondary check valve plate 163; the main check valve plate 161 1. When the first sub-one-way valve plate 162 and the second sub-one-way valve plate 163 move in a direction away from the main channel 141 as a whole, the main valve port 164 at least partially enters the drug-dissolving cavity 130 , so that the drug-dissolving cavity 130 communicates with the main channel 141; the main one-way valve plate 161, the first secondary one-way valve plate 162 and the second secondary one-way valve plate 163 are all along the When the direction of the main channel 141 moves, the main valve port 164 enters the main channel 141 , and the main one-way valve plate 161 separates the drug dissolving chamber 130 from the main channel 141 .

In this embodiment, the main valve port 164 is preferably substantially V-shaped, of course, it can also be designed as U-shaped or the like as required.

Embodiment two:

Please refer to Fig. 4, this embodiment proposes another kind of needle-type fine filter drug-dissolving syringe, the difference between it and the needle-type fine filter drug-dissolve syringe in the above-mentioned embodiment 1 is only: embodiment 2 is the same as that of embodiment 1 The first drug dissolving tube 120 has another design, forming the first drug dissolving tube 220 as shown in FIG. 4 . In the first embodiment, the first drug-dissolving tube 120 and the drug-dissolving cavity 130 are preferably integrally formed; while in the second embodiment, the first drug-dissolving tube 220 and the drug-dissolving cavity 230 are a detachable combination, further Furthermore, the first drug dissolving tube 220 can also be used as a syringe barrel of a common syringe in the prior art, and it can be installed on the drug dissolving cavity 230 to filter the drug solution when extracting and injecting the drug solution.

Specifically, the needle-type precision filter drug-dissolving syringe proposed in Embodiment 2 includes a push rod 210, a first drug-dissolving tube 220, a drug-dissolving cavity 230, a second drug-dissolving tube 240, and an injection needle 250; the push rod 210 moves The first drug-dissolving tube 220 is installed in the first drug-dissolving tube 220, and the first drug-dissolving tube 220 communicates with the drug-dissolving cavity 230; the second drug-dissolving tube 240 is provided with a main channel 241, a first Secondary channel 242, second secondary channel 243; the first port of the main channel 241 communicates with the drug dissolving cavity 230, and its second port communicates with the injection needle 250; the first port of the first secondary channel 242 The drug-dissolving cavity 230 is connected, and its second port meets the main channel 241; the first port of the second secondary channel 243 communicates with the drug-dissolving cavity 230, and its second port is connected to the main channel. intersection.

The needle-type precision filter drug-dissolving syringe also includes a flexible one-way valve, and the flexible one-way valve includes a main one-way valve plate 261, a first secondary one-way valve plate 262 and a second secondary one-way valve plate 263; The main one-way valve plate 261 is movably installed on the first port of the main channel 241, and the first secondary one-way valve plate 262 is movably installed on the second port of the first secondary channel 242, The opening direction of the main one-way valve plate 261 and the first auxiliary one-way valve plate 262 relative to the main channel 241 is opposite (the opening direction here refers to whether the two are far away or close to the main channel 241); The opening direction of the second secondary check valve plate 263 and the first secondary check valve plate 262 relative to the main channel 241 are the same; the inside of the drug dissolving cavity 230 is provided with a precision filter membrane 231, and the precision filter Membrane 231 separates the space between the first port of the main channel 241 to the first port of the first secondary channel 242 inside the drug-dissolving cavity 230; and the precision filter membrane 231 simultaneously separates The inside of the dissolving chamber 230 is separated from the first port of the main channel 241 to the first port of the second secondary channel 143 .

As shown in FIG. 4 , when the push rod 210 is pulled up, the liquid medicine can be extracted; when the push rod 210 is pushed down, the liquid medicine can be injected.

In this embodiment, the opening directions of the main one-way valve plate 261, the first secondary one-way valve plate 262 and the second secondary one-way valve plate 263 relative to the main channel 241 are opposite, and the following scheme is specifically preferred: The main one-way valve plate 261 can be opened along the direction away from the main channel 241; the first secondary one-way valve plate 262 can be opened along the direction away from the first secondary channel 242 (as shown in FIG. That is, the first secondary check valve plate 262 can be opened along the direction close to the central axis of the main channel 241); the second secondary check valve plate 263 can be opened along the direction away from the second secondary channel 243 (as shown in Figure 4 As shown, that is, the second secondary check valve plate 263 can also be opened along the direction close to the central axis of the main channel 241, so in this embodiment, the second secondary check valve plate 263 and the first secondary check valve plate 262 are relatively The opening direction of the main channel 241 is the same).

In the needle-type precision filter drug-dissolving syringe proposed in this embodiment, the second drug-dissolving tube 240 is provided with a main channel 241, a first auxiliary channel 242, and a second auxiliary channel 243; the first port of the main channel 241 communicates with the drug-dissolving chamber Body 230, the second port of which communicates with the injection needle 250; the first port of the first secondary channel 242 communicates with the dissolving chamber 230, and the second port of which merges with the main channel 241; the first port of the second secondary channel 243 communicates The drug-dissolving chamber 230, its second port merges with the main channel 241; the main one-way valve plate 261 is installed on the first port of the main channel 241, and the first secondary one-way valve plate 262 is installed on the first secondary On the second port of the channel 242, the second secondary check valve plate 263 is installed on the second port of the second secondary channel 243, and the main check valve plate 261 can be opened in a direction away from the main channel 241; The first secondary one-way valve plate 262 can be opened in a direction away from the first secondary channel 242; the second secondary one-way valve plate 263 can be opened in a direction away from the second secondary channel 243; The inside of the cavity 230 is provided with a precision filter membrane 231 (the precision filter membrane 231 is annular in this embodiment) that separates its interior from the first port of the main channel 241 to the first port of the first secondary channel 242. ), and the precision filter membrane 231 separates the space between the first port of the main channel 241 to the first port of the second secondary channel 243 inside the drug-dissolving cavity 230; when performing When extracting the liquid medicine, the liquid medicine is drawn into the main channel 241 through the injection needle 250. At this time, the main one-way valve plate 261 opens the first port of the main channel 241, and the first secondary one-way valve plate 262 closes the first secondary channel 242. The second port of the second sub-check valve plate 263 closes the second port of the second sub-channel 243, and the medical solution will enter the drug-dissolving chamber 230 through the first port of the main channel 241 (and the medical solution can reach the first in a drug-dissolving tube 220); when injecting medicinal liquid, the main one-way valve sheet 261 at the first port of the main passage 241 closes the first port of the main passage 241, and the filtered medicinal liquid will pass through the first secondary passage The first port of 242 enters the first secondary channel 242, and the first port of the second secondary channel 243 enters the second secondary channel 243. At this time, the first secondary check valve plate 262 opens the first secondary channel 242. The second port, the second secondary one-way valve plate 263 opens the second port of the second secondary channel 243, the medicinal liquid is filtered by the precision filter membrane 231, and the filtered medicinal liquid will pass through the second port of the first secondary channel 242 and The second port of the second secondary channel 243 merges into the main channel 241 , and finally the drug solution without particles is injected from the injection needle 250 , which effectively prevents the particles from harming the body of the patient. This embodiment is simple and exquisite in structure, easy to operate and highly practical.

In order to better realize the purpose of this embodiment, this embodiment also makes the following optimizations:

In this embodiment, the precision filter membrane 231 divides the interior of the drug dissolving cavity 230 into a main chamber 232 and a secondary chamber 233, and the main chamber 232 is connected to the first drug dissolving tube 220 and the secondary chamber 233 respectively. The first port of the main channel 241 is communicated with, and the secondary chamber 232 is respectively communicated with the first port of the first secondary channel 242 and the first port of the second secondary channel 243 .

In this embodiment, the main one-way valve plate 261 , the first secondary one-way valve plate 262 and the second secondary one-way valve plate 263 are preferably integrally formed, which can make the structure more delicate, compact and easy to implement. At the same time, the main one-way valve plate 261, the first secondary one-way valve plate 262 and the first secondary one-way valve plate 263 are all flexible one-way valve plates, so that when the liquid medicine is extracted, the liquid medicine enters from the injection needle 250. After the inside of the main channel 241, the main check valve plate 261 will be automatically flushed, and the first secondary check valve plate 262 and the second secondary check valve plate 263 will be compressed to close the second port of the first secondary channel 242 respectively. and the second port of the second secondary channel 243; when injecting the liquid medicine, the liquid medicine will press the main check valve plate 261 to close the first port of the main channel 241, and automatically flush the first secondary check valve plate 262 and the second secondary one-way valve plate 263, merge into the main channel 241, and finally inject it out from the injection needle 250. Specifically, the main one-way valve plate 261 , the first secondary one-way valve plate 262 and the second secondary one-way valve plate 263 are preferably integrally formed silicone valve plates, which meet the characteristics of integral molding and flexibility.

Further, the first end of the first auxiliary one-way valve plate 262 is connected to the main one-way valve plate 261, and the second end opposite to the first end is a free end; the second end of the second auxiliary one-way valve plate 263 One end is connected with the main one-way valve plate 261, and the second end opposite to the first end is a free end.

When the main one-way valve plate 261 , the first auxiliary one-way valve plate 262 and the second auxiliary one-way valve plate 263 move in a direction away from the main channel 241 as a whole, the main one-way valve plate 261 will The first port of the main passage 241 is opened, the free end of the first auxiliary one-way valve plate 262 closes the second port of the first auxiliary passage 242, and the free end of the second auxiliary one-way valve plate 263 The end closes the second port of the second secondary channel 243; the main check valve plate 261, the first secondary check valve plate 262 and the second secondary check valve plate 263 are all along the main channel When moving in the direction of 241, the main one-way valve plate 261 closes the first port of the main channel 241, and the free end of the first secondary one-way valve plate 262 closes the second port of the first secondary channel 242. The port is opened, and the free end of the second secondary one-way valve plate 263 opens the second port of the second secondary channel 243 .

A main valve port 264 is formed between the main check valve plate 261, the first end of the first secondary check valve plate 262 and the first end of the second secondary check valve plate 263; the main check valve plate 261 1. When the first sub-one-way valve plate 262 and the second sub-one-way valve plate 263 move in a direction away from the main channel 241 as a whole, the main valve port 264 at least partially enters the drug-dissolving cavity 230 , so that the drug-dissolving chamber 230 communicates with the main channel 241; the main one-way valve plate 261, the first secondary one-way valve plate 262 and the second secondary one-way valve plate 263 are all along the When the direction of the main channel 241 moves, the main valve port 264 enters the main channel 241 , and the main one-way valve plate 261 separates the drug dissolving cavity 230 from the main channel 241 .

In this embodiment, the main valve port 264 is preferably substantially V-shaped, of course, it can also be designed as U-shaped or the like as required.

The above-mentioned embodiments only express several implementations of the utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (9)

1. A needle-type precision filter drug-dissolving syringe, comprising a push rod, a first drug-dissolving tube, a drug-dissolving cavity, a second drug-dissolving tube and an injection needle; In the drug tube, the first drug-dissolving tube communicates with the drug-dissolving cavity; it is characterized in that, the second drug-dissolving tube is provided with a main channel, a first auxiliary channel and a second auxiliary channel; the main The first port of the channel communicates with the drug-dissolving cavity, and its second port communicates with the injection needle; the first port of the first secondary channel communicates with the drug-dissolving cavity, and its second port communicates with the main channel converging; the first port of the second secondary channel communicates with the drug-dissolving cavity, and the second port thereof meets the main channel; The needle-type precision filter drug-dissolving syringe also includes a flexible one-way valve, and the flexible one-way valve includes a main one-way valve plate, a first secondary one-way valve plate and a second secondary one-way valve plate; the main one-way valve plate The valve plate is movably installed on the first port of the main channel, the first secondary one-way valve plate is movably installed on the second port of the first secondary channel, and the second secondary one-way valve plate is movably installed on the second port of the first secondary channel. The valve plate is movably installed on the second port of the second secondary channel; the opening direction of the main one-way valve plate and the first secondary one-way valve plate are opposite to the main channel; the second secondary The opening direction of the one-way valve plate and the first secondary one-way valve plate relative to the main channel is the same; the inside of the drug-dissolving cavity is provided with a precision filter membrane, and the precision filter membrane separates the inside of the drug-dissolving cavity from The space between the first port of the main channel and the first port of the first secondary channel is separated; and the precision filter membrane simultaneously separates the inside of the drug-dissolving cavity from the first The port is spaced apart from the first port of the second secondary channel. 2. The needle-type precision filter drug-dissolving syringe according to claim 1, characterized in that, the main one-way valve can be opened in a direction away from the main passage; the first secondary one-way valve can be opened along the It is open in a direction away from the first secondary channel; the second secondary one-way valve plate can be opened in a direction away from the second secondary channel. 3. The needle-type precision filter drug-dissolving syringe according to claim 2, wherein the precision filter membrane divides the inside of the drug-dissolving cavity into a main chamber and a secondary chamber, and the main chamber is respectively It communicates with the first drug dissolving tube and the first port of the main channel, and the secondary chamber communicates with the first port of the first secondary channel and the first port of the second secondary channel respectively. 4 . The needle-type precision filter drug-dissolving syringe according to claim 3 , wherein the main one-way valve plate, the first secondary one-way valve plate and the second secondary one-way valve plate are integrally formed. 5. The needle-type precision filter drug-dissolving syringe according to claim 4, characterized in that, the main one-way valve plate, the first secondary one-way valve plate and the second secondary one-way valve plate are integrally formed Silicone valve disc. 6. The needle-type precision filter drug-dissolving syringe according to claim 4, characterized in that, the first end of the first secondary one-way valve plate is connected with the main one-way valve plate, and the second end opposite to the first end The end is a free end; the first end of the second auxiliary one-way valve plate is connected with the main one-way valve plate, and the second end opposite to the first end is a free end. 7. The needle-type precision filter drug-dissolving syringe according to claim 6, characterized in that, the main one-way valve plate, the first secondary one-way valve plate and the second secondary one-way valve plate When moving in the direction of the main channel, the main one-way valve plate opens the first port of the main channel, and the free end of the first secondary one-way valve plate closes the second port of the first secondary channel , the free end of the second secondary one-way valve plate closes the second port of the second secondary channel; the main one-way valve plate, the first secondary one-way valve plate and the second secondary one-way valve plate three When the whole moves in the direction close to the main channel, the main one-way valve plate closes the first port of the main channel, and the free end of the first secondary one-way valve plate closes the first secondary channel. The second port of the second secondary channel is opened, and the free end of the second secondary one-way valve plate opens the second port of the second secondary channel. 8. The needle-type precision filter drug-dissolving syringe according to claim 7, characterized in that, the first end of the main one-way valve plate, the first secondary one-way valve plate and the first end of the second secondary one-way valve plate A main valve port is formed between one end; when the main one-way valve plate, the first secondary one-way valve plate and the second secondary one-way valve plate move in a direction away from the main passage, the main valve The mouth at least partially enters the drug-dissolving cavity, so that the drug-dissolving cavity communicates with the main channel; the main one-way valve, the first secondary one-way valve and the second secondary one-way valve three When the whole body moves in a direction close to the main channel, the main valve port enters the main channel, and the main one-way valve plate separates the drug dissolving chamber from the main channel. 9 . The needle-type precision filter drug-dissolving syringe according to claim 8 , wherein the main valve port is roughly V-shaped.