CN206534959U - A kind of stopcock formula filtering injection needle with passage - Google Patents

Abstract

The utility model provides a rotary valve type filter injection needle with a ventilation hole, which comprises a steel needle and a needle seat. One-way rotary valve, the four-way rotary valve includes a housing, the two ends of the housing are respectively connected with the syringe and the steel needle, the housing is rotatably provided with a ball, and the ball is provided with a cross channel, and the inside of one channel in the cross channel is A filter membrane is vertically arranged, and a rotary head is arranged outside the shell, and the rotary head is connected to the outer wall of the sphere, and a fifth channel connected to the center of the cross channel is arranged in the sphere, and a fifth channel connected to the fifth channel is provided on the side wall of the shell. For the matching air outlet channel, a hydrophobic membrane is vertically arranged in the air outlet channel. The beneficial effect of the utility model is that the liquid medicine is completely filtered, the waste of the medicine can be avoided and exhausted quickly, the medicine can be dispensed safely and quickly, the operation is simple, the use is convenient, and the safety is high.

Description

A kind of rotary valve filter injection needle with air hole

technical field

The utility model relates to a syringe, in particular to a rotary valve type filtering injection needle with a ventilation hole, which belongs to medical equipment supplies.

Background technique

As we all know, most of the injections currently used clinically are packaged in glass bottles. When the needle of the syringe is used to pierce the rubber stopper or cut the glass bottle with a grinding wheel to extract the medicinal solution, the bottle stopper chips or glass powder will enter the injection solution. Traditional syringes do not have a filter function. When liquid medicine is drawn, these impurities will be drawn into the syringe and injected directly into the patient, thereby inducing diseases such as venous inflammation.

Patent CN103721322A discloses a filtered syringe, including a syringe and a filtered injection needle. The injection needle consists of a needle tube and a needle seat. The needle tube is installed at the front end of the upper needle seat, and the rear end of the lower needle seat is connected to the cone of the syringe. The front ends of the upper and lower needle seats are combined with the upper needle seat to form a suction inlet and an injection outlet. A check valve is installed on the lower needle seat. The check valve is opened in the suction direction of the suction inlet and the injection direction of the injection outlet. A filter is installed on the outlet. Due to the simultaneous design of the liquid inlet channel and the liquid outlet channel in the limited structural size of the needle seat, the two channels are relatively narrow, and the existence of the check valve forms an obstacle in front of the liquid passage, which will affect the suction and push fluid resistance. As a result, the force of pumping and pushing the liquid is greatly increased compared with conventional ordinary injection needles, and when the liquid is pumped, it narrowly passes through and then covers the filter membrane, and the flow rate of the liquid is slow, which increases the work intensity and working hours of the medical staff, making it unacceptable clinically. application. Furthermore, when pumping and pushing the liquid, the check valve must be opened first to form a liquid passage. Once the passage is opened, the instantaneous resistance becomes smaller, especially when the liquid is pushed and injected, the injection speed cannot be controlled well, which is easy to cause harm to the patient. cause some damages. Furthermore, the liquid inlet and outlet structure of the check valve is integrated with the liquid outlet and inlet structure. Therefore, when pumping liquid, the liquid inlet and outlet structure is retracted, which will pull the outlet and outlet structure, causing the outlet to open. Open, causing the liquid to enter the syringe from the non-filtered channel, so that the liquid impurities are not completely filtered, making the product design concept meaningless.

With the advancement of pharmaceutical technology, drugs with different physical characteristics have appeared in clinical practice. For example, some powder drugs for subcutaneous injection are often vacuum-packed in order to better maintain the stability of the drug. Before clinical injection of powder medicine, it needs to be dissolved and prepared with normal saline, that is, the syringe first draws normal saline and injects it into the powder medicine bottle. At this time, the medicine bottle is still in a state of negative pressure. Lower the syringe needle, and the inside and outside of the medicine bottle pass through the needle to form a channel, so that the inside of the medicine bottle returns to the atmospheric pressure state. At this time, use the syringe needle to extract the same amount of air as the medicine liquid and inject it into the medicine bottle, and then extract the medicine liquid for subcutaneous injection. There are risks in this clinical operation. The air in the ward directly contacts the liquid medicine, and pollutants such as microorganisms in the air are integrated into the liquid medicine and injected into the human body, which will cause harm to the patient. At the same time, before subcutaneous injection, the medical staff must first remove the air in the syringe, because the inner diameter of the syringe barrel is relatively large, the liquid outlet is in the center of the barrel, and air bubbles tend to exist on the edge of the barrel, making it difficult to remove the air bubbles smoothly In order to discharge the air bubbles, it is necessary for the medical staff to constantly flick the syringe, which is time-consuming and laborious, which increases the time for the medical staff to dispense the medicine.

Utility model content

The purpose of the utility model is to provide a rotary valve filter injection needle with a vent hole, which is simple in structure, convenient in operation and high in safety, which is especially suitable for clinical use.

The technical scheme of the utility model is:

A rotary valve filter injection needle with a vent hole, including a steel needle and a needle seat, the steel needle is installed at the front end of the needle seat, the rear end of the needle seat is connected to the cone of the syringe, and a four-way rotary valve is arranged in the needle seat, The four-way rotary valve includes a housing, and the two ends of the housing are respectively connected with the syringe and the steel needle. The housing is rotatably provided with a sphere, and a cross channel is arranged in the sphere, and a filter is installed vertically inside one of the cross channels. A rotary head is provided on the outside of the shell, and the rotary head is connected to the outer wall of the sphere. The fifth channel connected to the center of the cross channel is arranged in the sphere, and the fifth channel is provided on the side wall of the shell to match the fifth channel. The air outlet channel is provided with a vertical hydrophobic membrane in the air outlet channel.

The utility model is provided with a fifth channel. When in use, the steel needle is inserted into the medicine bottle, and the rotary head is rotated to match the fifth channel with the steel needle at the front end of the needle seat. At this time, one of the cross channels does not have a filter membrane The channel cooperates with the air outlet channel to balance the air pressure in the medicine bottle, so that the gas in the medicine bottle is discharged through the hydrophobic membrane of the air outlet channel.

The rotary head includes a connection part and a handle, one end of the connection part is connected with the outer wall of the sphere, and the other end of the connection part protrudes out of the shell and is connected with the handle.

The connecting part is perpendicular to the plane where the cross channel is located, and the handle is perpendicular to the connecting part.

The fifth channel is arranged on the angle bisector of two channels adjacent to the cross channel, and the angle between the air outlet channel and the steel needle is 45°.

The fifth channel is arranged on the angle bisector of two adjacent channels without filter membranes of the cross channel.

Rotate the rotary head to make the fifth channel match with the syringe taper at the rear end of the needle seat, and a channel without a filter membrane in the cross channel cooperate with the air outlet channel, so that the outside air can be sucked into the syringe through the air outlet channel.

Rotate the rotary head so that the two ends of the cross channel without filter membrane are respectively connected with the steel needle and the syringe taper, the air in the syringe can be pushed out through the steel needle, and the liquid medicine can also be sucked into the syringe from the medicine bottle .

Rotating the rotary head makes the two ends of the channel with the filter membrane in the cross channel respectively connected with the steel needle and the syringe taper, so that the liquid medicine in the syringe can be discharged from the steel needle after being filtered.

The air outlet channel includes a first part and a second part, one end of the first part is connected to the outer wall of the housing, the other end of the first part is connected to the second part, the inner diameter of the second part is greater than or equal to the outer diameter of the first part, The hydrophobic membrane is ultrasonically welded to the other end of the first part, and the diameter of the hydrophobic membrane is equal to the inner diameter of the second part.

A cylindrical fixed plug is provided inside the second part, the length of the fixed plug is equal to the length of the second part, the inner diameter of the fixed plug is smaller than or equal to the inner diameter of the first part, and the outer diameter of the fixed plug is equal to The inner diameter of the second part.

The utility model has the advantages and positive effects: due to the adoption of the above technical scheme, it is more convenient to discharge the air in the syringe and balance the air pressure in the medicine bottle; it has the advantages of simple structure, convenient operation, complete filtration of medicinal liquid, high safety, and convenient clinical use, etc. advantage.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of a rotary valve filter injection needle with a vent hole of the utility model

Figure 2 is a structural schematic diagram of a rotary valve filter injection needle with a vent hole in the present invention

In the picture:

1. Steel needle 2. Needle seat 3. Shell 4. Ball 5. Cross channel

6. Rotary head 7. Fifth channel 8. Filter membrane 9. Air outlet channel 10. Hydrophobic membrane

11. Handle 12. Connecting part 13. First part 14. Second part 15. Fixing plug

detailed description

As shown in Figure 1, the utility model is a rotary valve filter injection needle with a vent hole, including a steel needle 1 and a needle seat 2, the steel needle 1 is installed on the front end of the needle seat 2, and the rear end of the needle seat 2 is connected to On the cone head of the syringe, a four-way rotary valve is arranged inside the needle seat 2. The four-way rotary valve includes a housing 3, and the two ends of the housing 3 are respectively connected with the syringe and the steel needle 1, and a rotatable ball is arranged in the housing 3 4. The sphere 4 is provided with a cross channel 5, and a filter membrane 8 is vertically provided inside a channel of the cross channel 5, and a rotary head 6 is arranged outside the shell 3, and the rotary head 6 is connected to the outer wall of the sphere 4, and the sphere 4 is provided with a The fifth channel 7 connected to the center of the cross channel 5 is provided with an air outlet channel 9 matching with the fifth channel 7 on the side wall of the housing 3 , and a hydrophobic membrane 10 is vertically provided in the air outlet channel 9 .

As shown in FIG. 2 , the swivel head 6 includes a connecting portion 12 and a handle 11 , one end of the connecting portion 12 is connected to the outer wall of the sphere 4 , and the other end of the connecting portion 12 protrudes from the housing 3 to connect with the handle 11 . Further, the connecting portion 12 is perpendicular to the plane of the cross channel 5 , and the handle 11 is perpendicular to the connecting portion 12 .

The fifth channel 7 is on the angle bisector of two channels adjacent to the cross channel 5, and the angle between the air outlet channel 9 and the steel needle 1 is 45°.

Furthermore, the fifth channel 7 is arranged on the bisector of the angle between two adjacent channels without filter membranes of the cross channel 5 .

As shown in Figure 1, the air outlet channel 9 includes a first part 13 and a second part 14, one end of the first part 13 is connected with the outer wall of the housing 3, the other end of the first part 13 is connected with the second part 14, and the second part The inner diameter of 14 is greater than or equal to the outer diameter of the first part 13, the hydrophobic membrane 10 is ultrasonically welded to the other end of the first part 13, and the diameter of the hydrophobic membrane 10 is equal to the inner diameter of the second part 14.

In order to further increase the stability of the hydrophobic membrane 10, a cylindrical fixed plug 15 can be provided inside the second part 14, the length of the fixed plug 15 is equal to the length of the second part 14, and the inner diameter of the fixed plug 15 is less than or equal to the first part 13, the outer diameter of the fixed plug 15 is equal to the inner diameter of the second part 14. In this way, the hydrophobic membrane 10 is firmly pressed and fixed to the other end of the first part 13 by the end of the fixing plug 15. When the pressure of the exhaust gas is too high, the hydrophobic membrane 10 is not easily damaged, resulting in leakage of the medicinal solution.

The working process of this example:

When the utility model is in use, according to the personal operating habits of the medical personnel, they can choose to draw liquid, filter it, push it without filtering it, or draw it without filtering it, push it and filter it. When in use, insert the steel needle 1 into the medicine bottle, rotate the handle 11 of the rotary head 6 to make the fifth channel 7 match the steel needle 1 at the front end of the needle holder 2, at this time, one of the cross channels 5 does not have a filter membrane 8 The channel and the air outlet channel 9 cooperate to balance the air pressure in the medicine bottle, so that the gas in the medicine bottle is discharged through the hydrophobic membrane 10 of the air outlet channel 9 .

Rotate the handle 11 of the swivel head 6 so that the fifth channel 7 matches the syringe taper at the rear end of the needle holder 2, and a channel without a filter membrane in the cross channel 5 cooperates with the air outlet channel 9, so that the outside air can pass through the air outlet Channel 9 draws into the syringe.

Rotate the handle 11 of the swivel head 6 so that the two ends of the channel without the filter membrane in the cross channel 5 are respectively connected with the steel needle 1 and the syringe cone, so that the air in the syringe can be pushed out through the steel needle 1, and the liquid medicine can also be released from the The vial is drawn into the syringe.

Rotate the handle 11 of the swivel head 6 so that the two ends of the channel with the filter membrane 8 in the cross channel 5 are respectively connected with the steel needle 1 and the syringe taper, and the medicinal liquid in the syringe can be discharged from the steel needle 1 after being filtered.

An embodiment of the present utility model has been described in detail above, but the content described is only a preferred embodiment of the present utility model, and cannot be considered as limiting the implementation scope of the present utility model. All equal changes and improvements made according to the application scope of the utility model should still belong to the scope covered by the patent of the utility model.

Claims (7)

1. A rotary valve-type filter injection needle with a vent hole, including a steel needle and a needle seat, the steel needle is installed at the front end of the needle seat, the rear end of the needle seat is connected to the cone of the syringe, and a four-way rotation is arranged inside the needle seat The four-way rotary valve includes a housing, and the two ends of the housing are respectively connected with the syringe and the steel needle. The housing is rotatably provided with a ball, and a cross channel is provided in the ball. There is a filter membrane, a rotary head is provided outside the shell, and the rotary head is connected to the outer wall of the sphere. It is characterized in that: the fifth channel connected to the center of the cross channel is arranged in the sphere, and In the air outlet channel matched with the fifth channel, a hydrophobic membrane is vertically arranged in the air outlet channel. 2. A rotary valve filter injection needle with a vent hole according to claim 1, characterized in that: the rotary head includes a connecting part and a handle, one end of the connecting part is connected with the outer wall of the sphere, and the connecting part The other end extends out of the shell and is connected with the handle. 3 . The rotary valve filter injection needle with vent hole according to claim 2 , wherein the connection part is perpendicular to the plane where the cross channel is located, and the handle is perpendicular to the connection part. 4 . 4. A rotary valve filter injection needle with a vent hole according to any one of claims 1-3, characterized in that: the fifth channel is arranged on the bisector of the angle between two channels adjacent to the cross channel Above, the angle between the air outlet channel and the steel needle is 45°. 5. A rotary valve filter injection needle with a vent hole according to claim 4, characterized in that: the fifth channel is set at the angle bisected between two channels adjacent to the cross channel without a filter membrane on-line. 6. A rotary valve filter injection needle with a vent hole according to claim 5, characterized in that: the air outlet channel includes a first part and a second part, one end of the first part is connected to the outer wall of the housing, The other end of the first part is connected to the second part, the inner diameter of the second part is greater than or equal to the outer diameter of the first part, the hydrophobic membrane is ultrasonically welded to the other end of the first part, and the diameter of the hydrophobic membrane is equal to the inner diameter of the second part . 7. A rotary valve filter injection needle with a vent hole according to claim 6, characterized in that: a cylindrical fixing plug is arranged inside the second part, and the length of the fixing plug is equal to the second The length of the part, the inner diameter of the fixed plug is less than or equal to the inner diameter of the first part, and the outer diameter of the fixed plug is equal to the inner diameter of the second part.