CN107126600A - Isolation protector and the injection device with the Isolation protector - Google Patents

Abstract

The invention discloses an isolation protector and an injection device with the isolation protector. The isolation protector includes a closed container, a partition and a first one-way opening and closing part. The closed container has a chamber, a first end and a second end, the first end is provided with a receiving hole suitable for plugging in with the first nozzle on the syringe, and the second end is provided with a second nozzle suitable for plugging in with an injection needle; the separator is arranged on the closed In the container, the chamber is divided into a diversion chamber and a buffer chamber, the diversion chamber communicates with the receiving hole and the second liquid outlet, and the separator is provided with a discharge hole that communicates the buffer chamber with the diversion chamber; the first The one-way opening and closing member is arranged on the partition and closes the discharge hole, and is configured to open the discharge hole in one direction along the direction from the diversion chamber to the buffer chamber when the liquid pressure in the diversion chamber is greater than a first predetermined value . The invention can isolate the syringe without polluting the syringe and reducing the risk of infection caused by the syringe. In addition, discomfort caused by pushing too fast can be prevented.

Description

Isolation protector and injection device with the same

technical field

The invention relates to a medical appliance, in particular to an isolation protector and an injection device with the isolation protector.

Background technique

A syringe is a common medical appliance. The syringe consists of a syringe barrel with a small hole at the front end and a matching plunger rod, which is used to inject liquid into areas that are inaccessible by other methods or withdraw them from those places. When the rod is pulled out, the liquid or gas is inhaled from the small hole at the front of the syringe, and the liquid or gas is squeezed out when the core rod is pushed in.

However, when using the syringe to inject liquid into the human body, especially during intramuscular injection, as the plunger rod is pushed in, the liquid in the syringe is gradually injected into the human body, and when the plunger rod is pushed to the limit position, , when the liquid injection is completed, due to the high pressure of the liquid caused by the accumulation of liquid on the injection site on the human body surface, there may be part of the liquid backflow at this position, and it may enter the front end of the syringe through the needle, so that the front end of the syringe pollute. In addition, depending on the experience of doctors or nurses to push the plunger rod, it is inevitable that the injection speed will be too fast to cause discomfort or pain to the patient.

Contents of the invention

The present invention aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, an object of the present invention is to provide an isolation protector.

Another object of the present invention is to provide an injection device with the above isolation protector.

To achieve the above object, on the one hand, the isolation protector according to the embodiment of the present invention is suitable for being connected between the syringe and the injection needle, comprising:

A closed container, the closed container has a chamber, a first end and a second end, the first end is provided with a receiving hole suitable for being inserted into the first liquid outlet nozzle on the syringe, and the second The end is provided with a second liquid nozzle suitable for insertion with the injection needle;

A partition, the partition is arranged in the closed container, and divides the chamber into a diversion chamber and a buffer chamber, the diversion chamber communicates with the receiving hole and the second liquid outlet, the The separator is provided with a discharge hole that communicates the buffer chamber with the diversion chamber;

The first one-way opening and closing part is arranged on the partition and closes the discharge hole, and is configured to be configured to When the value is high, the discharge hole is opened unidirectionally along the direction from the guide cavity to the buffer cavity.

According to the isolation protector provided by the embodiment of the present invention, the isolation protector can be connected between the syringe and the injection needle, so that when there is a liquid backflow problem, the backflow liquid enters the isolation protector instead of the syringe , therefore, will not cause contamination to the syringe, reducing the risk of infection caused by the syringe. In addition, when the pushing speed is too fast, the liquid pressure in the diversion chamber in the isolation protector increases, and when it reaches the first predetermined value, the first one-way opening and closing member can be opened. At this time, the diversion The liquid in the cavity will enter into the buffer cavity through the discharge hole, thereby reducing the flow of liquid flowing in from the second liquid outlet, thereby playing a protective role and preventing the flow caused by excessive pushing to a certain extent. Discomfort caused by oversize.

In addition, the isolation protector according to the above embodiments of the present invention may also have the following additional technical features:

According to an embodiment of the present invention, also include:

The second one-way opening and closing part, the end of the receiving hole away from the syringe is a closed end, and the closed end is provided with a liquid outlet hole, and the second one-way opening and closing part is arranged on the closed end and closes the closed end. The liquid outlet hole is configured to open the liquid outlet hole in one direction along the direction from the liquid outlet hole to the diversion chamber when the liquid pressure in the first liquid outlet nozzle is greater than a second predetermined value .

According to an embodiment of the present invention, the second predetermined value is smaller than the first predetermined value.

According to an embodiment of the present invention, also include:

A piston assembly, the piston assembly includes a piston and a spring, the piston is slidably installed in the buffer cavity and isolates the buffer cavity into a first sub-cavity and a second sub-cavity, and the spring is arranged in the buffer cavity The above is arranged in the first sub-cavity and provides driving force for the piston, and the second sub-cavity communicates with the discharge hole; the partition is provided with the second sub-cavity and a return hole connected to the diversion cavity;

The third one-way opening and closing member, the third one-way opening and closing member is arranged on the partition and closes the return hole, and is configured so that when the liquid pressure in the second sub-cavity is greater than the third predetermined value, the return hole is opened unidirectionally along the direction from the second sub-cavity to the guide chamber.

According to an embodiment of the present invention, the closed container is formed as a hollow cylinder, the partition is formed as a cylinder with both ends open and arranged coaxially with the closed container, one end of the cylinder is connected to the receiving One end of the hole away from the syringe communicates, and the other end of the barrel communicates with the second liquid outlet.

According to an embodiment of the present invention, the piston is sheathed outside the cylinder and closely attached to the outer wall of the cylinder.

According to an embodiment of the present invention, the closed container includes a cup body and a sealing cover, one end of the cup body is provided with the second liquid outlet, and the other end of the cup body is an open end; the sealing cover It is threadedly connected with the open end, and the sealing cover is provided with the receiving hole.

According to an embodiment of the present invention, the one end of the cup body is provided with an inwardly protruding threaded interface, the other end of the cylinder body is threadedly connected to the threaded interface, and the cylinder body One end fits tightly with the sealing cover.

According to an embodiment of the present invention, each of the first one-way opening and closing member, the second one-way opening and closing member and the third one-way opening and closing member is a one-way valve plate.

On the other hand, an injection device provided according to an embodiment of the present invention includes:

A syringe, the syringe includes a syringe and a plunger rod, the syringe has a flow passage, a proximal end and a far end, the far end has a first liquid outlet communicating with the fluid passage, the plunger rod Can be slidably mounted on the injection barrel;

As mentioned above, the isolating flow restrictor, the receiving hole of the isolating flow restrictor is plugged into the first liquid outlet nozzle;

An injection needle, the injection needle is inserted into the second liquid outlet nozzle of the isolation flow restrictor.

The injection device provided according to the embodiment of the present invention has the above-mentioned isolation protector, so that the syringe will not be polluted during injection, and the risk of infection caused by the syringe is reduced. In addition, it can play a protective role and prevent discomfort caused by excessive flow caused by pushing too fast to a certain extent.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative effort.

Fig. 1 is the perspective view of the isolation protector of the embodiment of the present invention;

Fig. 2 is an exploded view of an isolation protector according to an embodiment of the present invention;

Fig. 3 is a cross-sectional view of an isolation protector according to an embodiment of the present invention;

Fig. 4 is a cross-sectional view of the isolation protector according to the embodiment of the present invention when the first one-way opening and closing member and the second one-way opening and closing member are opened;

Fig. 5 is a cross-sectional view of the isolation protector according to the embodiment of the present invention when the third one-way shutter is opened;

Figure 6 is a perspective view of an injection device according to an embodiment of the present invention;

Fig. 7 is a sectional view of the injection device according to the embodiment of the present invention;

Fig. 8 is an exploded view of an injection device according to an embodiment of the present invention.

Reference signs:

Isolation protector 100;

closed container 10;

Cup body 101;

The second liquid outlet 1011;

sealing cover 102;

Receiving hole 1021;

Liquid outlet hole 1022;

divider 20;

Drain hole 201;

return hole 202;

Diversion cavity P01;

Buffer cavity P02;

The first sub-cavity P021;

The second sub-cavity P022;

The first one-way opening and closing member 30;

The second one-way opening and closing member 40;

piston assembly 50;

Piston 501;

spring 502;

The third one-way opening and closing member 60;

Syringe 200;

Injection barrel 210;

The first liquid nozzle 2101;

plunger rod 220;

Injection needle 300.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, but cannot be construed as limitations to the present invention. Based on the embodiments in the present invention, those skilled in the art do not make creative work premise All other embodiments obtained below all belong to the protection scope of the present invention.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", " The orientation or positional relationship indicated by "circumferential", "radial", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must Having a particular orientation, being constructed and operating in a particular orientation, and therefore not to be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

The isolation protector 100 of the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

1 to 5, the isolation protector 100 provided according to the embodiment of the present invention is suitable for being connected between the syringe 200 and the injection needle 300, and includes a closed container 10, a partition 20 and a first one-way opening and closing 30 pieces.

Specifically, the closed container 10 has a chamber, a first end and a second end, and the first end is provided with a receiving hole 1021 suitable for being inserted into the first liquid outlet nozzle 2101 on the syringe 200, the The second end is provided with a second liquid outlet nozzle 1011 suitable for insertion with the injection needle 300 . That is to say, after the receiving hole 1021 at the first end of the closed container 10 is inserted into the first outlet nozzle 2101 of the syringe 200, the isolation protector 100 can be assembled on the syringe 200, and through the closed After the second liquid outlet nozzle 1011 at the second end of the container 10 is inserted into the injection needle 300 , the injection needle 300 can be assembled on the isolation protector 100 . It should be noted that the closed container 10 is connected to the syringe 200 and the injection needle 300 through a plug-in connection, which is convenient for assembly and disassembly.

The separator 20 is arranged in the closed container 10, and divides the chamber into a diversion chamber P01 and a buffer chamber P02, the diversion chamber P01 communicates with the receiving hole 1021 and the second liquid outlet 1011, The partition member 20 is provided with a discharge hole 201 that communicates the buffer chamber P02 with the diversion chamber P01.

That is to say, the partition 20 in the chamber in the closed container 10 is divided into a flow guide chamber P01 and a buffer chamber P02. After plugging, the closed container 10 can communicate with the diversion cavity P01 in the closed container 10, and the liquid in the syringe 200 can flow into the diversion cavity P01 of the closed container 10 through the first liquid outlet nozzle 2101, and then flow from the diversion chamber P01 to the closed container 10. The chamber P01 flows to the second liquid outlet 1011 of the closed container 10 , and finally enters the injection needle 300 through the second liquid outlet 1011 . At the same time, since the separator 20 is provided with a discharge hole 201 , when the discharge hole 201 is in an open state, the liquid in the diversion chamber P01 can also enter the buffer chamber P02 through the discharge hole 201 .

The first one-way opening and closing member 30 is arranged on the partition member 20 and closes the discharge hole 201, and is configured so that when the liquid pressure in the diversion chamber P01 is greater than a first predetermined value, The direction from the guide chamber P01 to the buffer chamber P02 opens the discharge hole 201 in one direction.

That is to say, the first one-way opening and closing member 30 is used to control the opening and closing of the discharge hole 201 on the partition 20. Specifically, when injecting liquid with the syringe 200, the liquid flows in through the first liquid outlet nozzle 2101. to the diversion cavity P01, when the liquid pressure in the diversion cavity P01 is greater than the first predetermined value, the first one-way opening and closing member 30 is opened, and at this time, the discharge hole 201 is opened, and the liquid in the diversion cavity P01 Liquid can enter the buffer chamber P02, and when the liquid pressure in the diversion chamber P01 is lower than the first predetermined value, the first one-way opening and closing member 30 is closed, and at this time, the liquid in the diversion chamber P01 cannot enter to buffer cavity P02.

It should be noted that the first predetermined value is the minimum value of liquid pressure required to open the first one-way opening and closing member 30. Therefore, the first one-way opening and closing member 30 can be set according to the normal injection speed that the human body can bear, so that the second A one-way shutter 30 is opened under suitable pressure.

Please refer to FIG. 6 to FIG. 8 , as well as FIG. 3 to FIG. 5 , the process of using the isolation protector 100 , the syringe 200 and the injection needle 300 in cooperation with the present invention will be briefly described below.

Firstly, insert the receiving hole 1021 of the isolation protector 100 with the first liquid outlet nozzle 2101 on the syringe 200 , and insert the injection needle 300 with the second liquid outlet head of the isolation protector 100 . And insert the injection needle 300 into the injection site of the human body.

Next, push the plunger rod 220 of the syringe 200 with a little force, so that the liquid in the syringe 200 flows from the first liquid outlet nozzle 2101 into the diversion chamber P01 of the isolation protector 100, and then flows into the diversion chamber P01 through the diversion chamber P01. The injection needle 300 is finally injected into the human body from the injection needle 300 .

When the pushing speed is too fast, the liquid flowing into the diversion cavity P01 will increase, and the diameter of the injection needle 300 is relatively small, so the pressure of the liquid in the diversion cavity P01 will increase. When the liquid in the injection needle 300 increases, the flow rate of the liquid in the injection needle 300 will also increase, causing discomfort to the human body. In this case, if the liquid pressure in the diversion chamber P01 is greater than the first predetermined value, the first one-way opening and closing member 30 on the partition 20 is opened, and at this time, the discharge hole 201 on the partition 20 is opened (As shown in FIG. 4 ), part of the liquid in the diversion chamber P01 enters into the buffer chamber P02 through the discharge hole 201, so that the flow rate flowing into the injection needle 300 can be reduced;

Finally, when the liquid injection is completed, the injection needle 300 is pulled out from the human body. It should be noted that when the injection is completed and the injection needle 300 is not pulled out, because the liquid accumulation at the injection site in the human body may cause a relatively high local pressure, some liquid may flow back into the injection needle 300, even after injection. The needle 300 flows into the guide chamber P01 of the isolation protector 100 .

According to the isolation protector 100 provided in the embodiment of the present invention, the isolation protector 100 can be connected between the syringe 200 and the injection needle 300, so that when there is a liquid backflow problem, the backflow liquid enters the isolation protector 100, and It will not enter the syringe 200, therefore, it will not pollute the syringe 200, reducing the risk of infection caused by the syringe 200. In addition, when the pushing speed is too fast, the liquid pressure in the diversion chamber P01 in the isolation protector 100 increases, and when it reaches the first predetermined value, the first one-way opening and closing member 30 can be opened. At this time , the liquid in the diversion cavity P01 will enter into the buffer cavity P02 through the discharge hole 201, thereby reducing the flow rate of the liquid flowing in from the second liquid outlet nozzle 1011, thereby playing a protective role, preventing to a certain extent due to Discomfort caused by excessive flow caused by pushing too fast.

It should be noted that the syringe 200 may be a disposable plastic syringe 200 , or a reusable metal or glass syringe 200 . If it is a disposable syringe 200, if the syringe 200 is contaminated, it will easily cause cross-infection after the syringe 200 is discarded or in the process of waste transfer, recycling, etc.; In use, if the disinfection is not complete, it will cause infection to subsequent patients. Therefore, the isolation protector 100 provided by the embodiment of the present invention can completely isolate the syringe 200 and the injection needle 300, prevent the backflow liquid from entering the syringe 200, and reduce the Infection risk posed by syringe 200 .

2 to 4, in some embodiments of the present invention, it also includes a second one-way opening and closing member 40, the end of the receiving hole 1021 away from the syringe 200 is a closed end, and the closed end is set There is a liquid outlet hole 1022, the second one-way opening and closing member 40 is arranged at the closed end and closes the liquid outlet hole 1022, and is configured so that when the liquid pressure in the first liquid outlet nozzle 2101 is greater than the first When a predetermined value is reached, the liquid outlet hole 1022 is opened unidirectionally along the direction from the liquid outlet hole 1022 to the flow guide cavity P01.

That is to say, the second one-way opening and closing member 40 is used to control the opening and closing of the liquid outlet hole 1022. Specifically, when the liquid pressure in the first liquid outlet nozzle 2101 on the syringe 200 is greater than the second predetermined value, the The second one-way opening and closing member 40 is opened. At this time, the liquid outlet hole 1022 is opened (as shown in FIG. 4 ), and the liquid in the first liquid outlet nozzle 2101 can enter the diversion cavity P01, and when the first liquid outlet nozzle When the liquid pressure in 2101 is lower than the second predetermined value, the second one-way opening and closing member 40 is closed, and at this time, the liquid in the first liquid outlet nozzle 2101 cannot enter into the diversion cavity P01. In this way, when using the syringe 200 to inject liquid, the pressure in the first liquid outlet nozzle 2101 will gradually increase, and finally the pressure in the first liquid outlet nozzle 2101 will be greater than the second predetermined value to open the second one-way opening and closing member 40, and the liquid can be discharged from the first liquid outlet. The mouth 2101 flows into the diversion cavity P01.

At the same time, since the second one-way opening and closing member 40 is unidirectionally conducting along the direction from the liquid outlet hole 1022 to the flow guide cavity P01, and the direction from the flow guide cavity P01 to the liquid outlet hole 1022 cannot be conducted, so when the injection When the injection needle 300 is not pulled out, if part of the liquid flows back into the injection needle 300 and flows into the diversion cavity P01 of the isolation protector 100 through the injection needle 300, due to the second one-way opening and closing member 40, the direction from the diversion cavity P01 to the liquid outlet hole 1022 cannot be conducted, so this part of the liquid cannot flow into the first liquid outlet nozzle 2101 of the syringe 200, so that the backflow liquid can be blocked and the backflow liquid can be avoided. The contamination caused by the syringe 200, thereby reducing the risk of infection caused by the syringe 200 and further improving its safety.

Optionally, the second predetermined value is smaller than the first predetermined value. That is to say, the liquid pressure required when the second one-way opening and closing member 40 is opened is smaller than the liquid pressure required when the first one-way opening and closing member 30 is opened, so that it can be ensured that the second one-way opening and closing member 30 can be opened during the injection process. The opening and closing member 40 is easy to be opened, and the liquid in the syringe 200 can flow into the diversion cavity P01 more smoothly. At the same time, the first one-way opening and closing valve will not be easily opened, only when the pressure value of the liquid in the diversion chamber P01 is relatively high (that is, greater than the second predetermined value), it will be opened, and then part of the liquid in the diversion chamber P01 will be opened. The flow is diverted to the buffer cavity P02, so its use effect is better, which can not only inject the liquid smoothly, but also ensure the diversion when the pressure is too high.

2 to 4, in some embodiments of the present invention, a piston assembly 50 and a third one-way opening and closing member 60 are also included, wherein the piston assembly 50 includes a piston 501 and a spring 502, and the piston 501 Slidingly installed in the buffer cavity P02 and isolating the buffer cavity P02 into a first sub-cavity P021 and a second sub-cavity P022, the spring 502 is arranged in the first sub-cavity P021 and provide driving force for the piston 501, the second sub-cavity P022 communicates with the discharge hole 201; the partition 20 is provided with the second sub-cavity P022 and the guide The flow chamber P01 communicates with the return hole 202 .

The third one-way opening and closing member 60 is arranged on the partition member 20 and closes the return hole 202, and is configured so that when the liquid pressure in the second sub-chamber P022 is greater than a third predetermined value, The direction from the second sub-cavity P022 to the guide cavity P01 opens the return hole 202 in one direction.

That is to say, the piston assembly 50 is set in the buffer chamber P02 inside the closed container 10, wherein the piston 501 is slidingly fitted with the buffer chamber P02, and can slide back and forth in the buffer chamber P02, and when the piston 501 slides, the first The sub-cavity P021 and the second sub-cavity P022 produce opposite volume changes, and the second sub-cavity P022 communicates with the discharge hole 201, that is, part of the liquid in the diversion chamber P01 can flow in the first unit When the opening and closing member 30 is opened, it flows into the second sub-cavity P022 through the discharge hole 201 .

The spring 502 is arranged in the first subcavity P021 and can provide a driving force for the piston 501. For example, in the example of FIG. In contrast, when the piston 501 slides toward the second end of the closed container 10, the first sub-cavity P021 is compressed and its volume decreases, while the second sub-cavity P022 is released and its volume increases. When the piston 501 slides toward the closed container When the first end of 10 slides, the second sub-cavity P022 is compressed to reduce its volume, and the first sub-cavity P021 is released to increase its volume.

The third one-way opening and closing member 60 is used to control the opening and closing of the return hole 202 on the partition 20. Specifically, when the liquid pressure in the second sub-cavity P022 is greater than the third predetermined value, the third The one-way opening and closing member 60 is opened, at this time, the return hole 202 is opened, and the liquid in the second sub-cavity P022 flows back to the diversion cavity P01, and then is injected into the human body through the injection needle 300 from the diversion cavity P01. When the pressure of the liquid in the second sub-cavity P022 is lower than the third predetermined value, the third one-way opening and closing member 60 is closed, and at this time, the liquid in the second sub-cavity P022 cannot flow back into the guide chamber P01.

When injecting with the syringe 200, the liquid in the first liquid outlet nozzle 2101 of the syringe 200 flows into the diversion cavity P01 after passing through the second one-way opening and closing member 40, when the liquid pressure in the diversion cavity P01 is relatively high ( greater than the first predetermined value), at this time, the first one-way opening and closing member 30 is opened (as shown in Figure 4), a part of the liquid enters the second sub-cavity P022 through the discharge hole 201, and the second sub-cavity The pressure of the liquid in P022 gradually increases, and the liquid inside pushes the piston 501 to slide towards the second end of the closed container 10. At this time, the volume of the first sub-cavity P021 gradually decreases, and the spring 502 inside it is gradually compressed, and the spring The driving force generated by 502 on the piston 501 gradually increases, while the volume of the second sub-chamber P022 gradually increases, and the accumulated liquid gradually increases. And when the liquid pressure in the guide chamber P01 decreases (for example, the syringe 200 is close to or has been injected) to less than the driving force of the spring 502, at this time, the spring 502 is released, and the piston 501 is pushed to slide toward the first end of the closed container 10 , at this time, the inside of the second sub-cavity P022 is compressed, the volume gradually decreases, and the internal liquid pressure gradually increases. When the internal liquid pressure is greater than the third predetermined value, the third one-way opening and closing member 60 is opened, and the return hole 202 Open (as shown in Figure 5), the liquid in the second sub-cavity P022 can flow back into the diversion cavity P01 through the return hole 202, and then inject it into the human body from the diversion cavity P01 through the injection needle 300, thus, it can Realize reinjecting part of the liquid entering the second sub-cavity P022 into the human body, reducing drug waste and metering errors.

It should be noted that since the first one-way opening and closing member 30 conducts in one direction along the direction from the guide cavity P01 to the second sub-cavity P022, and the third one-way opening and closing member 60 conducts along the direction of the second sub-cavity The direction from P022 to the guide cavity P01 is unidirectional, so when the first one-way opening and closing member 30 is opened, the third one-way opening and closing member 60 is closed, and when the third one-way opening and closing member 60 is opened , the first one-way opening and closing member 30 is closed, that is, when the discharge hole 201 is opened, the return hole 202 is closed, and when the return hole 202 is opened, the discharge hole 201 is closed, so that it can be ensured The discharge hole 201 and the return hole 202 are always kept in different states to ensure that the liquid split discharge and the liquid return are independent of each other.

Advantageously, in one embodiment of the present invention, the closed container 10 is formed as a hollow cylinder, and the partition 20 is formed as a cylinder with both ends open and arranged coaxially with the closed container 10. One end communicates with the end of the receiving hole 1021 away from the syringe 200 , and the other end of the cylinder communicates with the second outlet nozzle 1011 .

That is to say, the cylindrical space inside the cylinder body is partially defined as the diversion cavity P01, and the annular space between the cylinder body and the closed container 10 is defined as the buffer cavity P02, so that the structure is simpler and more compact, and the buffer cavity P02 and the diversion cavity P01 The arrangement is reasonable, and it is convenient to communicate with the syringe 200 and the injection needle 300 .

Correspondingly, the piston 501 is sheathed outside the cylinder and closely adheres to the outer wall of the cylinder, that is to say, a through hole is opened in the center of the piston 501, and the through hole is used to pass through the cylinder to realize the piston 501 and the cylinder. At the same time, the hole wall of the through hole is closely fitted with the outer wall of the cylinder, which can realize sealing and reduce liquid leakage. When the spring 502 provides a driving force to push the piston 501 to slide toward the first end of the closed container 10 , the piston 501 can smoothly squeeze the liquid in the second sub-cavity P022 into the flow guide cavity P01 through the return hole 202 .

Please refer to Figures 2 to 4, in a specific embodiment of the present invention, the closed container 10 includes a cup body 101 and a sealing cover 102, and one end of the cup body 101 is provided with the second liquid outlet nozzle 1011, The other end of the cup body 101 is an open end; the sealing cover 102 is screwed to the opening end, and the sealing cover 102 is provided with the receiving hole 1021 .

During assembly, the spacer can be installed in the cup body 101 first, then the spring 502 and the piston 501 can be installed in the cup body 101, and finally, the sealing cover 102 and the cup body 101 can be connected and sealed, so that the assembly is simple and convenient. Moreover, the structure is simple and the sealing performance is good.

Exemplarily, the one end of the cup body 101 is provided with an inwardly protruding threaded interface, the other end of the cylinder body is threadedly connected to the threaded interface, and the one end of the cylinder body is connected to the sealing The cover 102 fits snugly. That is to say, the cylinder body and the cup body 101 are connected by threads. In this way, on the one hand, the assembly can be made simpler and more convenient; 1011 connected.

Optionally, each of the first one-way opening and closing member 30, the second one-way opening and closing member 40 and the third one-way opening and closing member 60 is a one-way valve plate, and a one-way valve plate is adopted, and its structure is simple. The thickness is thin, easy to install, and can meet the requirements of one-way conduction.

Please refer to FIG. 6 to FIG. 8 , the injection device provided according to the embodiment of the present invention includes a syringe 200 , an isolation restrictor as described in the above embodiment, and an injection needle 300 .

Wherein, the syringe 200 includes a syringe 210 and a plunger rod 220, the syringe 210 has a flow passage, a proximal end and a distal end, and the distal end has a first liquid outlet nozzle 2101 communicating with the fluid passage. The plunger rod 220 is slidably mounted on the syringe 210 .

The receiving hole 1021 of the isolation flow restrictor is inserted into the first liquid outlet nozzle 2101 .

The injection needle 300 is inserted into the second liquid outlet nozzle 1011 of the isolation restrictor.

The injection device provided according to the embodiment of the present invention has the above-mentioned isolation protector 100 , so the syringe 200 will not be polluted during injection, and the risk of infection caused by the syringe 200 is reduced. In addition, it can play a protective role and prevent discomfort caused by excessive flow caused by pushing too fast to a certain extent.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

The above is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or direct/indirect use All other relevant technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. a kind of Isolation protector, is adapted to attach between syringe and injection needle, it is characterised in that including：

Closed vessel, the closed vessel has chamber, first end and the second end, and the first end, which is provided with, to be suitable to and the injection The receiver hole that the first liquid outlet on device is plugged, second end, which is provided with, to be suitable to go out liquid with the injection needle is plugged second Mouth；

Separator, the separator is arranged in the closed vessel, and the chamber is divided into diversion cavity and cushion chamber, institute State diversion cavity to communicate with the receiver hole and the second liquid outlet, the separator is provided with the cushion chamber and the diversion cavity The escape orifice of connection；

First unidirectional opening and closing element, the first unidirectional opening and closing element is arranged on the separator and closes the escape orifice, and by It is configured to when the fluid pressure in the diversion cavity is more than first predetermined value, along the diversion cavity to the direction of the cushion chamber Unidirectionally open the escape orifice.

2. Isolation protector according to claim 1, it is characterised in that also include：

Second unidirectional opening and closing element, the one end of the receiver hole away from the syringe is blind end, and the blind end is provided with out liquid Hole, the second unidirectional opening and closing element is arranged at the blind end and closes the fluid hole, and is configured to when described first goes out When fluid pressure in liquid mouth is more than second predetermined value, unidirectionally opened along the fluid hole to the direction of the diversion cavity described in go out Fluid apertures.

3. Isolation protector according to claim 1, it is characterised in that the second predetermined value is less than described first and made a reservation for Value.

4. Isolation protector according to claim 2, it is characterised in that also include：

Piston component, the piston component includes piston and spring, and the piston is slidably installed in the cushion chamber and by institute State cushion chamber and be isolated into the first sub- cavity and the second sub- cavity, the spring is arranged at described be arranged in the described first sub- cavity And motive force is provided for the piston, the second sub- cavity is communicated with the escape orifice；The separator is provided with will be described The return port that second sub- cavity is connected with the diversion cavity；

3rd unidirectional opening and closing element, the 3rd unidirectional opening and closing element is arranged at the separator and closes the return port, and by structure Cause when the fluid pressure in the described second sub- cavity is more than third predetermined value, along the described second sub- cavity to the diversion cavity Direction unidirectionally open the return port.

5. Isolation protector according to claim 1, it is characterised in that the closed vessel is formed as hollow circuit cylinder Shape, the separator is formed as both ends open and the cylinder being coaxially disposed with the closed vessel, one end of the cylinder and institute State the one end of receiver hole away from the syringe to communicate, the other end of the cylinder is communicated with second liquid outlet.

6. Isolation protector according to claim 5, it is characterised in that the piston be arranged the cylinder it is outer and with institute The outer wall for stating cylinder is brought into close contact.

7. Isolation protector according to claim 5, it is characterised in that the closed vessel includes cup and sealing Lid, one end of the cup is provided with second liquid outlet, and the other end of the cup is openend；The closure with it is described Openend is threadedly coupled, and the closure is provided with the receiver hole.

8. Isolation protector according to claim 7, it is characterised in that described one end of the cup is provided with to convex The hickey gone out, the other end of the cylinder is threadedly coupled with the hickey, described one end of the cylinder with The closure is brought into close contact.

9. Isolation protector according to claim 3, it is characterised in that the first unidirectional opening and closing element, second unidirectional Each in opening and closing element and the 3rd unidirectional opening and closing element is check valve sheet.

10. a kind of injection device, it is characterised in that including：

Syringe, the syringe includes injection tube and plunger rod, and the injection tube has circulation passage, near-end and distal end, institute Stating distal end has the first liquid outlet communicated with the fluid passage, and the plunger rod is slidably installed in injection tube；

Isolate current limiter as any one of claim 1 to 9, the receiver hole of the isolation current limiter and described first goes out liquid Mouth is plugged；

Injection needle, the injection needle is plugged with second liquid outlet for isolating current limiter.