CN221831341U - A pressure-controlled syringe - Google Patents

Abstract

The utility model discloses a pressure-controlled injector, belonging to the field of medical appliances. The injection device comprises a needle cylinder and a first plunger, wherein the first plunger is connected with a piston and the needle cylinder to form a cavity for filling injection medicament, a closed cavity is formed between the first plunger and a second plunger, a pressure sealing ring is pushed when the pressure in the cavity is increased, and the pressure is released through an exhaust hole, so that medical staff can be helped to control the injection pushing speed and the injection pressure, and the injection speed and the injection pressure are prevented from being too high.

Description

A pressure-controlled syringe

Technical Field

The utility model relates to the field of medical equipment, in particular to a pressure-controlled syringe.

Background Art

In the clinical treatment process, syringes are a very common medical device. Including intramuscular injection of drugs, vaccine injection, and anesthesia injection. The use of syringes plays a vital role. At present, the operation of syringes is to control the infusion speed and pressure manually by feel. However, in some treatment processes, when injecting drugs to patients, the control of injection speed and pressure is very important. Too fast speed and too high pressure may cause damage to the injection site or tissue of the patient, and the negative effects sometimes determine the success or failure of the treatment. Therefore, relying on medical staff to push drugs slowly by feel has great disadvantages, especially when a large amount of drugs needs to be pushed and must be pushed slowly, it will cause medical staff to control unsteadily, making the pushing speed difficult to control, and the speed suddenly too fast and the pressure suddenly increase.

Chinese invention patent CN113995917A discloses a syringe, including a syringe and a needle plug, the needle plug includes an outer needle plug and an inner needle plug; the two ends of the inner needle plug are respectively sleeved in the syringe and the outer needle plug, and the inner needle plug forms a first chamber and a second chamber with the syringe and the outer needle plug respectively; the inner needle plug is provided with a first opening connected to the first chamber; the outer needle plug is provided with a second opening connected to the second chamber; when the injection pressure is too high, the first opening and the second opening can be at least partially overlapped, so that the injection liquid in the first chamber overflows outward through the overlapped part of the first opening and the second opening, so as to relieve the pressure of the first chamber and reduce the injection pressure. However, in this scheme, when the injection pressure is too high, the injection liquid will overflow outward, which not only causes waste, but also causes the risk of drug contamination.

Utility Model Content

The technical problem to be solved by the utility model is the problem existing in the prior art, and a pressure-controlled syringe is proposed, which can help medical personnel control the injection propulsion speed and injection pressure to prevent the injection speed from being too fast and the injection pressure from being too high.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A pressure-controlled syringe comprises a syringe and a first plunger, wherein the syringe is a hollow cylindrical structure, one end of which is provided with an injection end, and the other end is provided with a syringe annular baffle; the first plunger is a closed cylindrical structure, arranged inside the syringe, one end of the first plunger is provided with a medicine-pushing sealing ring, and the other end is connected to a second plunger; the medicine-pushing sealing ring forms a cavity inside the syringe with the injection end to fill the injection medicine;

The second column bolt is provided with a backlog section, which is an open cylindrical structure, the backlog section is connected with a pressure relief section, which is an open cylindrical structure and communicates with the backlog section, and the pressure relief section is provided with a column bolt circular baffle away from the backlog section;

A pressure seal ring is arranged inside the pressure relief section, a spring is arranged between the pressure seal ring and the cylindrical baffle of the column bolt, and an exhaust hole is arranged in the middle of the pressure relief section. The spring provides a certain range of pressure for the pressure seal ring.

Furthermore, the first column bolt and the backlog section are mutually interlaced and adapted, and form a closed cavity with the pressure sealing ring. Thus, when the second column bolt is pushed, a certain range of pressure will be formed in the closed cavity, and the injection medicine will be pushed forward by pushing the first column bolt.

Furthermore, the syringe is coaxially connected to the first stud and the second stud, so as to ensure that when the stud circular baffle is pushed, the first stud can be smoothly pushed forward in the syringe.

Furthermore, the pressure relief section is provided with support wings on the outside, and the support wings can provide a certain stability to the second plunger, so that the second plunger can maintain axial forward movement in the syringe when it is pushed forward.

Preferably, the syringe and the second plunger are made of transparent material, and the pressure seal ring is made of dark material, so that medical staff can judge the syringe advancement speed and injection pressure by observing the position of the pressure seal ring.

Compared with the prior art, the pressure-controlled syringe proposed by the utility model has a pressure chamber and an exhaust hole inside. When the medical staff injects too fast and the pressure is too high, the air pressure in the pressure chamber pushes the pressure seal to move, and the air is exhausted and the pressure is released through the exhaust hole. This effectively helps medical staff control the injection speed and injection pressure, and prevents the injection speed from being too fast and the injection pressure from being too high.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is an exploded view of a pressure-controlled syringe of the utility model;

FIG2 is a structural diagram of a pressure-controlled syringe of the utility model;

FIG3 is a structural diagram of the overlap between the sealing plug and the vent hole of a pressure-controlled syringe according to the present invention;

Fig. 4 is a cross-sectional view taken along A-A of Fig. 3;

Figure numerals: 1, syringe; 101, injection end; 102, syringe annular baffle; 2, medicine pushing sealing ring; 3, first column bolt; 4, second column bolt; 401, backlog section; 402, pressure relief section; 403, column bolt circular baffle; 404, pressure sealing ring; 405, spring; 406, exhaust hole; 407 support wing.

Specific embodiments

The implementation scheme of the utility model will be described in detail below with reference to examples, but those skilled in the art will understand that the following examples are only used to illustrate the utility model and should not be regarded as limiting the scope of the utility model.

With reference to Fig. 1 and Fig. 2, the utility model provides a pressure-controlled syringe, characterized in that it comprises a syringe 1 and a first plunger 3, wherein the syringe 1 is a hollow cylindrical structure, one end of which is provided with an injection end 101, and the other end of which is provided with a syringe annular baffle 102; the first plunger 3 is a closed cylindrical structure, which is arranged inside the syringe 1, one end of the first plunger 3 is provided with a medicine-pushing sealing ring 2, and the other end is connected with a second plunger 4; the medicine-pushing sealing ring 2 forms a cavity inside the syringe 1 with the injection end 101 to fill the injection medicine;

The second column bolt 4 is provided with a pressure section 401, the pressure section 401 is an open cylindrical structure, the center of the pressure section 401 is connected with a pressure relief section 402, the pressure relief section 402 is an open cylindrical structure and communicates with the pressure section 401, the pressure section and the pressure relief section are coaxially and concentrically connected, and the pressure relief section 402 is provided with a column bolt circular baffle 403 away from the pressure section 401;

A pressure seal ring 404 is provided inside the pressure relief section 402 , a spring 405 is provided between the pressure seal ring 404 and the cylindrical baffle plate 403 of the column bolt, and an exhaust hole 406 is provided in the middle of the pressure relief section 402 .

The first column bolt 3 and the backlog section 401 are interlaced and adapted with each other, and form a closed cavity with the pressure sealing ring 404.

The syringe 1 is coaxially connected to the first plunger 3 and the second plunger 4 .

The pressure relief section is provided with support wings 407 on the outside, and preferably 2 to 4 support wings are provided.

The syringe 1 and the second plunger 4 are made of transparent material, and the pressure sealing ring 404 is made of dark material.

When medical staff need to give patients injection treatment, they first stabilize the syringe and provide extrusion force between the syringe annular baffle and the cylindrical baffle to provide propulsion force for the second cylindrical plug. When the second cylindrical plug is pushed, the closed cavity between the second cylindrical plug and the first cylindrical plug generates a certain range of pressure, and the pressure pushes the first cylindrical plug forward in the syringe. Finally, the medicine push seal ring pushes the injection into the patient's body through the injection section.

Refer to Figure 3 and Figure 4. During the drug advancement process, medical staff can observe the position of the pressure seal ring inside the pressure relief section of the second column bolt to determine whether the advancement pressure is too high. When the advancement speed is too fast, the pressure in the closed cavity formed between the first column bolt and the second column bolt will increase. At this time, the excessive pressure will push the pressure seal ring to compress the spring. When the pressure seal ring reaches the exhaust hole position in the middle of the pressure relief section, the air inside the closed cavity will be discharged from the exhaust hole to reduce the injection pressure and slow down the advancement speed. Reduce the advancement speed and pressure, the pressure inside the closed cavity will decrease, and the pressure seal ring will leave the exhaust hole due to the elastic force of the spring. At this time, the injection can be advanced at a more moderate pressure.

Although the utility model has been described in detail in general and specific embodiments in this specification, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims (4)

1. The pressure control injector is characterized by comprising a needle cylinder (1) and a first stud (3), wherein the needle cylinder (1) is of a hollow cylindrical structure, one end of the needle cylinder is provided with an injection end (101), and the other end of the needle cylinder is provided with a needle cylinder annular baffle (102); the first stud (3) is of a closed cylindrical structure and is arranged inside the needle cylinder (1), one end of the first stud (3) is provided with a medicine pushing sealing ring (2), and the other end of the first stud is connected with a second stud (4); the medicine pushing sealing ring (2) and the injection end (101) form a cavity inside the needle cylinder (1) to be filled with injection medicines;

The second plunger (4) is provided with a backlog section (401), the backlog section (401) is of an open cylindrical structure, the backlog section (401) is connected with a pressure relief section (402), the pressure relief section (402) is of an open cylindrical structure and is communicated with the backlog section (401), and the pressure relief section (402) is far away from the backlog section (401) and is provided with a plunger circular baffle (403);

Pressure seal ring (404) is arranged inside pressure release section (402), be provided with spring (405) between pressure seal ring (404) and the circular baffle of stud (403), pressure release section (402) middle part is provided with exhaust hole (406).

2. A pressure-controlled syringe according to claim 1, characterized in that the first stud (3) is inter-fitted with the backlog section (401) and forms a closed cavity with the pressure seal (404).

3. A pressure-controlled syringe according to claim 1, characterized in that the needle cylinder (1) is coaxially connected to both the first stud (3) and the second stud (4).

4. The pressure-controlled syringe of claim 1, wherein the barrel (1) and the second plunger (4) are made of transparent materials, and the pressure sealing ring (404) is made of dark materials.