CN104083818B - An intravenous syringe and an intravenous syringe needle - Google Patents

Abstract

The invention discloses an intravenous injector and an intravenous injector needle head, wherein the needle head consists of a plastic socket joint and a metal needle head body fixedly connected with the end part of the socket joint, a hemispherical valve seat is formed at the end part close to the needle head body in the socket joint, and a spherical valve ball is arranged in the valve seat; a liquid inlet and outlet communicated with the needle head body is formed at the bottom of the valve seat close to the needle head body, and a step is formed between the end part of the valve seat and the inner wall of the sleeve joint; install a retaining ring on the step, the outer wall of retaining ring is connected with the inner wall interference fit of cup joint, and the inner wall shaping of retaining ring has a plurality of interior lugs that are used for blockking that the valve ball deviates from. When the syringe is used for extracting the liquid medicine, the speed is not influenced by the valve ball, and when the syringe is used for transfusion, the liquid medicine is not influenced. The liquid medicine only flows through the liquid passing seam, and patients with slow flow rate do not feel uncomfortable.

Description

An intravenous syringe and an intravenous syringe needle

technical field

The invention belongs to medical equipment, in particular to an intravenous injector.

Background technique

Intravenous injection is a medical method, that is, inject blood, medicinal liquid, nutrient solution and other liquid substances directly into the vein; transient intravenous injection is usually injected directly into the vein with a syringe, which is the common "injection"; If there is a lot of liquid injected intravenously, the medical staff tends to speed up the injection speed. Some medical staff’s hand shaking can also lead to an instantaneous injection speed. Patients with trauma and heart failure are prone to infusion reactions, which can be fatal in severe cases.

Contents of the invention

The technical problem to be solved by the present invention is to provide an intravenous injector with a simple structure, capable of extracting medicinal liquid normally and slowing down the injection speed in view of the deficiencies in the prior art.

In order to achieve the purpose of the present invention, the following technical solutions are adopted: an intravenous syringe includes a syringe, a piston rod and a needle, the end of the piston rod is connected with a piston that matches the syringe, and the needle matches Sleeved on the needle joint at the front end of the syringe, the needle is composed of a plastic sleeve joint and a metal needle body fixedly connected to the end of the sleeve joint, and the end of the sleeve joint close to the needle body A hemispherical valve seat is formed on the upper part of the valve seat, and a spherical valve ball is installed in the valve seat; the bottom of the valve seat close to the needle body forms a liquid inlet and outlet connected with the needle body, and the end of the valve seat and the inner wall of the sleeve joint A step is formed between them; a retaining ring is installed on the step, the outer wall of the retaining ring is connected with the inner wall of the socket joint by interference fit, and the inner wall of the retaining ring is formed with a plurality of inner protrusions for preventing the valve ball from protruding; the said The inner wall of the valve seat is formed with a liquid passage connecting the liquid inlet and outlet and the inside of the sleeve joint; the diameter of the valve ball is 4/5 of the diameter of the spherical surface where the valve seat is located; On a circle concentric with the outer wall of the retaining ring, and the diameter of the circle where the end of the inner protrusion is located is 3/4 of the diameter of the valve ball; the cross-sectional area of the liquid inlet and outlet is the cross-sectional area of the passage in the needle 1/5-1/3 of the cross-sectional area.

The present invention also provides a needle for an intravenous syringe. The needle is composed of a plastic sleeve joint and a metal needle body fixedly connected to the end of the sleeve joint. The end of the sleeve joint close to the needle body A hemispherical valve seat is formed, and a spherical valve ball is installed in the valve seat; the bottom of the valve seat close to the needle body forms a liquid inlet and outlet connected with the needle body, and the gap between the end of the valve seat and the inner wall of the socket joint A step is formed; a retaining ring is installed on the step, and the outer wall of the retaining ring is connected with the inner wall of the sleeve joint by interference fit, and the inner wall of the retaining ring is formed with a plurality of inner protrusions for preventing the valve ball from protruding; the said The inner wall of the valve seat is formed with a liquid passage connecting the liquid inlet and outlet and the inside of the socket; the diameter of the valve ball is 4/5 of the diameter of the spherical surface where the valve seat is located; the ends of each of the inner protrusions are at the On a circle concentric with the outer wall of the retaining ring, and the diameter of the circle where the end of the inner protrusion is located is 3/4 of the diameter of the valve ball; the cross-sectional area of the liquid inlet and outlet is the cross-sectional area of the passage in the needle body 1/5-1/3 of that.

Compared with the prior art, the beneficial effect of the present invention is that when the syringe is used to extract the liquid medicine, the liquid medicine enters from the needle body, passes through the valve seat and the sleeve joint, and finally flows into the syringe, and the valve ball reaches the needle barrel under the push of the liquid medicine. On the inner bump of the retaining ring, the liquid medicine flows through the gap between the inner bump and the valve ball, so that the speed of extracting the liquid medicine is basically not affected by the valve ball. When performing infusion, the piston pushes the liquid medicine in the syringe to flow to the needle body. When the liquid medicine passes through the valve seat, it will push the valve ball to move towards the needle body, so that the valve ball will block the liquid inlet and outlet, and the liquid medicine can only flow from the valve seat. The liquid through the seam on the seat flows into the needle body. The cross-sectional area of the liquid-passing seam is 1/5-1/3 of the cross-sectional area of the channel in the needle body, so that when a larger force is used to push the piston rod, the speed of the liquid medicine flowing out of the needle body can also be kept relatively fast. The small flow rate will not cause the patient to feel nausea or heart discomfort due to excessive infusion speed caused by uneven force. The diameter of the valve ball is 4/5 of the diameter of the spherical surface where the valve seat is located to ensure that the valve ball can stably block the liquid inlet and outlet during the infusion process, so that the medicinal liquid only passes through the liquid passage. The diameter of the circumference where the inner bump is located is 3/4 of the diameter of the valve ball. On the one hand, it ensures that the valve ball does not escape from the retaining ring, and on the other hand, it ensures that the gap between the valve ball and the inner bump maintains a stable diameter. Ensure that the speed of extracting the liquid medicine is relatively fast.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the syringe.

Fig. 2 is a schematic cross-sectional structure diagram of the needle.

1. Syringe; 11. Needle connector; 2. Piston rod; 3. Needle; 31. Sleeve joint; 32. Valve seat; 33. Needle body; 34. Retaining ring; 341. Inner bump; 35. Valve ball; 36, through the liquid seam; 37, the liquid inlet and outlet.

detailed description

A detailed description will be given below of specific embodiments of the present invention according to the accompanying drawings.

Example 1

As shown in Figures 1 to 2, an intravenous syringe described in this embodiment includes a syringe 1, a piston rod 2 and a needle, the end of the piston rod is connected with a piston that matches the syringe, the The needle is matched and socketed on the needle joint 11 at the front end of the syringe. The needle 3 is composed of a plastic sleeve joint 31 and a metal needle body 33 fixedly connected to the end of the sleeve joint. The sleeve joint A hemispherical valve seat 32 is formed near the end of the needle body, and a spherical valve ball 35 is installed in the valve seat; the bottom of the valve seat near the needle body forms a liquid inlet and outlet 37 communicated with the needle body, A step is formed between the end of the valve seat and the inner wall of the sleeve joint; a retaining ring 34 is installed on the step, and the outer wall of the retaining ring is connected with the inner wall of the sleeve joint by interference fit. The inner convex block 341 where the valve ball protrudes; the inner wall of the valve seat is formed with a liquid passage 36 connecting the liquid inlet and outlet and the inside of the sleeve joint; the diameter of the valve ball is 4/5 of the diameter of the spherical surface where the valve seat is located The ends of each of the inner protrusions are located on a circle concentric with the outer wall of the retaining ring, and the diameter of the circumference where the ends of the inner protrusions are located is 3/4 of the diameter of the valve ball; The cross-sectional area of the liquid port is 1/5-1/3 of the cross-sectional area of the channel in the needle body.

When the syringe is used to extract the liquid medicine, the liquid medicine enters from the needle body, passes through the valve seat and sleeve joint, and finally flows into the syringe barrel. Pushed by the liquid medicine, the valve ball is against the inner protrusion of the retaining ring, and the liquid medicine protrudes from the inside. The gap between the block and the valve ball flows through, so that the speed of extracting the liquid medicine is basically not affected by the valve ball. When performing infusion, the piston pushes the liquid medicine in the syringe to flow to the needle body. When the liquid medicine passes through the valve seat, it will push the valve ball to move towards the needle body, so that the valve ball will block the liquid inlet and outlet, and the liquid medicine can only flow from the valve seat. The liquid through the seam on the seat flows into the needle body. The cross-sectional area of the liquid-passing seam is 1/5-1/3 of the cross-sectional area of the channel in the needle body, so that when a larger force is used to push the piston rod, the speed of the liquid medicine flowing out of the needle body can also be kept relatively fast. The small flow rate will not cause the patient to feel nausea or heart discomfort due to excessive infusion speed caused by uneven force. The diameter of the valve ball is 4/5 of the diameter of the spherical surface where the valve seat is located to ensure that the valve ball can stably block the liquid inlet and outlet during the infusion process, so that the medicinal liquid only passes through the liquid passage. The diameter of the circumference where the inner bump is located is 3/4 of the diameter of the valve ball. On the one hand, it ensures that the valve ball does not escape from the retaining ring, and on the other hand, it ensures that the gap between the valve ball and the inner bump maintains a stable diameter. Ensure that the speed of extracting the liquid medicine is relatively fast. The retaining ring is installed in the needle before the syringe is packaged. After the needle is sleeved on the needle connector through the socket joint, the end of the needle connector will push the retaining ring tightly, and the retaining ring will be completely restricted between the end of the needle connector and the valve seat and will not fall out. There is no need to use glue or other methods for fixing between them, and the assembly is convenient.

Example 2

As shown in Figures 1 to 2, a needle for an intravenous syringe according to this embodiment, the needle 3 is composed of a plastic sleeve joint 31 and a metal needle body 33 fixedly connected to the end of the sleeve joint. A hemispherical valve seat 32 is formed at the end of the sleeve joint close to the needle body, and a spherical valve ball 35 is installed in the valve seat; the bottom of the valve seat close to the needle body is formed to communicate with the needle body A step is formed between the end of the valve seat and the inner wall of the sleeve joint; a retaining ring 34 is installed on the step, the outer wall of the retaining ring is connected with the inner wall of the sleeve joint by interference fit, and the inner wall of the retaining ring is shaped There are a plurality of inner protrusions 341 used to prevent the valve ball from protruding; the inner wall of the valve seat is formed with a liquid passage 36 that communicates with the liquid inlet and outlet and the inside of the sleeve joint; the diameter of the valve ball is the valve seat. 4/5 of the diameter of the spherical surface; the ends of each of the inner protrusions are located on a circle concentric with the outer wall of the retaining ring, and the diameter of the circumference where the ends of the inner protrusions are located is 3 times the diameter of the valve ball /4; the cross-sectional area of the liquid inlet and outlet is 1/5-1/3 of the cross-sectional area of the channel in the needle body.

The syringe includes a syringe 1, a piston rod 2 and the needle 3, the end of the piston rod is connected with a piston matched with the syringe, and the socket 31 of the needle 3 is matched and sleeved on the front end of the syringe. On the needle connector 11, the needle of the present invention can be matched with various intravenous syringes of different specifications and models.

When the syringe equipped with this needle is used to extract the liquid medicine, the liquid medicine enters from the needle body, passes through the valve seat and sleeve joint, and finally flows into the syringe barrel. Pushed by the liquid medicine, the valve ball is against the inner protrusion of the retaining ring, and the medicine liquid The liquid flows through the gap between the inner bump and the valve ball, so that the speed of extracting the liquid medicine is basically not affected by the valve ball. When performing infusion, the piston pushes the liquid medicine in the syringe to flow to the needle body. When the liquid medicine passes through the valve seat, it will push the valve ball to move towards the needle body, so that the valve ball will block the liquid inlet and outlet, and the liquid medicine can only flow from the valve seat. The liquid through the seam on the seat flows into the needle body. The cross-sectional area of the liquid-passing seam is 1/5-1/3 of the cross-sectional area of the channel in the needle body, so that when a larger force is used to push the piston rod, the speed of the liquid medicine flowing out of the needle body can also be kept relatively fast. The small flow rate will not cause the patient to feel nausea or heart discomfort due to excessive infusion speed caused by uneven force. The diameter of the valve ball is 4/5 of the diameter of the spherical surface where the valve seat is located to ensure that the valve ball can stably block the liquid inlet and outlet during the infusion process, so that the medicinal liquid only passes through the liquid passage. The diameter of the circumference where the inner bump is located is 3/4 of the diameter of the valve ball. On the one hand, it ensures that the valve ball does not escape from the retaining ring, and on the other hand, it ensures that the gap between the valve ball and the inner bump maintains a stable diameter. Ensure that the speed of extracting the liquid medicine is relatively fast. The retaining ring is installed in the needle before the syringe is packaged. After the needle is sleeved on the needle connector through the socket joint, the end of the needle connector will push the retaining ring tightly, and the retaining ring will be completely restricted between the end of the needle connector and the valve seat and will not fall out. There is no need to use glue or other methods for fixing between them, and the assembly is convenient.

Claims (1)

1. an intravenous injector, include syringe, piston rod and syringe needle, described piston rod end connects the piston coordinated with described syringe, described syringe needle coupling is socketed on the syringe needle joint of syringe front end, described syringe needle is made up of the bell and spigot joint of a plastic material and the needle head body of a metal material being fixedly connected on bell and spigot joint end, it is characterized in that: in described bell and spigot joint, the end of close needle head body forms the valve seat of a semi-spherical shape, is provided with a spherical valve ball in valve seat；Described valve seat forms the liquid in-out mouth connected with needle head body near the bottom of needle head body, forms a step between valve seat end and bell and spigot joint inwall；Being provided with a back-up ring on described step, the outer wall of back-up ring is connected with the inwall interference fit of bell and spigot joint, and the inwall of back-up ring forms multiple in order to stop the interior projection that valve ball is deviate from；The liquid of crossing that described valve base inner wall face forms within a connection liquid in-out mouth and bell and spigot joint stitches；Residing for a diameter of valve seat of described valve ball the 4/5 of spherical diameter；The end of each described interior projection one with on the circumference of back-up ring outer wall concentric, and the 3/4 of a diameter of valve ball diameter of the circumference residing for end of described interior projection；The 1/5-1/3 that cross-sectional area is needle head body internal channel cross-sectional area of described liquid in-out mouth.