CN104056320B - A kind of medical injection chemicals dosing plant - Google Patents

Abstract

The invention relates to a medical injection dosing device. The tail of the syringe is a closed end, and a strip-shaped through hole is opened on the side wall. The push-pull device includes a piston cylinder, a piston, a U-shaped connecting rod and a push-pull handle. The piston cylinder is attached to the On the outer wall of the syringe, the side wall of the piston cylinder is provided with a ventilation hole corresponding to the strip-shaped through hole, and a piston is arranged in the piston cylinder, and the piston is connected with the push-pull handle through a U-shaped connecting rod. A ventilation tube is arranged on the side wall of the needle, and the opening end of the ventilation tube is arranged toward the needle holder, and an air inlet hole is provided on the side wall of the ventilation tube close to the closed end, and the air inlet hole and the opening end of the ventilation tube are provided with air filter membrane. The dosing device of the present invention is simple in structure, easy to use, and can effectively prevent cross-infection of the liquid medicine when operating the syringe, and the needle of the dosing device has a ventilation tube, which can maintain the air pressure balance inside and outside the medicine bottle during the medicine pumping process , making the dosing operation more labor-saving and improving the work efficiency of dosing.

Description

A medical injection dosing device

technical field

The invention relates to the technical field of medical devices, in particular to a medical injection dosing device.

Background technique

At present, the dosing syringe commonly used in hospitals is an ordinary syringe, which is composed of a syringe, a piston and a push rod. During operation, the medical staff pushes and pulls the piston through the push rod to move, so as to realize operations such as suctioning and mixing the liquid medicine. The process of dispensing medicine is: insert the syringe into the liquid medicine bottle to extract a small amount of medicine liquid; then pull out the syringe and insert it into the medicine powder bottle, inject the medicine liquid into the medicine powder bottle, and after the medicine powder and medicine liquid are completely dissolved, draw out the mixed solution and inject it into the medicine powder bottle. In the infusion bottle. However, in actual use, it has been found that when medical staff perform operations such as suctioning and mixing medicinal liquid, their fingers will touch the push rod, which may cause contamination of the medicinal liquid and easily cause cross-infection. And in the above-mentioned dispensing process, since the medicine bottle is a sealed structure, a certain negative pressure difference will be generated during operation, which makes the operation very laborious.

Contents of the invention

The object of the present invention is to provide a medical injection dosing device to solve the above-mentioned technical problems.

In order to solve the deficiencies of the above-mentioned technical problems, the technical solution adopted by the present invention is: a medical injection dosing device, including a syringe, a needle, a needle holder and a push-pull device, the needle is fixedly arranged on the needle holder, and the syringe passes through the head Cooperate with the needle seat;

The tail of the syringe is a closed end, and the side wall of the syringe near the tail is provided with a strip-shaped through hole along the circumferential direction. The push-pull device includes a piston cylinder, a piston, a U-shaped connecting rod and a push-pull handle, and the piston cylinder is An arc-shaped housing with one end open, the piston cylinder is attached to the outer wall of the syringe near the tail, and the opening of the piston cylinder is set towards the head of the syringe, and the side wall of the piston cylinder near the closed end corresponds to a strip-shaped through hole The position is provided with a vent hole, and the communication between the piston cylinder and the syringe is realized through the strip-shaped through hole and the vent hole. A piston is arranged in the piston cylinder, and the piston is connected with the push-pull handle through a U-shaped connecting rod. The opening direction is opposite to the opening direction of the piston cylinder. One end of the U-shaped connecting rod is placed inside the piston cylinder and fixedly connected with the piston. The other end of the U-shaped connecting rod is placed outside the piston cylinder and fixedly connected with the push-pull handle. The outer wall of the piston cylinder There are two guide rails arranged along the axial direction of the syringe, the push-pull handle is clamped on the two guide rails, the push-pull handle can be displaced along the direction of the guide rails, the side wall of the syringe near the head end is provided with a baffle, and the baffle A spring is arranged between the plate and the U-shaped connecting rod, one end of the spring is fixed on the baffle plate, and the other end of the spring is fixed on the cross bar of the U-shaped connecting rod;

The side wall of the needle is provided with a vent tube, the vent tube is a cylindrical tube with one end open, the other end of the vent tube is a closed end, and the closed end is spike-shaped, and the open end of the vent tube faces The needle seat is set, and the side wall of the ventilation tube close to the closed end is provided with an air inlet hole, the air inlet hole and the opening end of the ventilation tube are all provided with an air filter membrane, and the needle is also sleeved with a retaining ring, the retaining ring Set between the air intake hole and the open end of the snorkel.

The material of the needle base is plastic.

Beneficial effect

The dosing device of the present invention can prevent the operator from touching the push rod and the piston that may come into contact with the liquid medicine with his fingers during the dosing process, has a simple structure, is convenient to use, and can effectively prevent cross-infection of the liquid medicine when operating the syringe. In addition, the needle of the medicine dosing device has a ventilation tube, which can maintain the air pressure balance inside and outside the medicine bottle during the medicine pumping process, so that the medicine dosing operation is more labor-saving and the work efficiency of the medicine dosing can be improved.

Description of drawings

Fig. 1 is the structural representation of dosing device of the present invention;

Fig. 2 is a schematic structural view of the medicine dosing device of the present invention when drawing medicine;

Markings in the figure: 1. Syringe, 2. Needle, 3. Needle seat, 4. Bar-shaped through hole, 5. Piston cylinder, 6. Piston, 7. U-shaped connecting rod, 8. Push-pull handle, 9. Air pipe , 10, air intake hole, 11, retaining ring, 12, baffle plate, 13, spring.

detailed description

As shown in the figure: a medical injection dosing device, including a syringe 1, a needle 2, a needle holder 3 and a push-pull device, the needle 2 is fixedly arranged on the needle holder 3, and the material of the needle holder 3 is plastic. The syringe 1 is mated with the needle holder 3 through the head. The tail of the syringe 1 is a closed end, and the side wall of the syringe 1 near the tail is provided with a strip-shaped through hole 4 along the circumferential direction. The push-pull device includes a piston cylinder 5, a piston 6, a U-shaped connecting rod 7 and The push-pull handle 8, the piston cylinder 5 is an arc-shaped housing with an open end, the piston cylinder 5 is attached to the outer wall of the syringe 1 near the tail, and the opening of the piston cylinder 5 is arranged towards the head of the syringe 1, the piston On the side wall of the cylinder 5 close to the closed end, a vent hole is provided at the position corresponding to the strip-shaped through hole 4, and the communication between the piston cylinder 5 and the syringe 1 is realized through the strip-shaped through hole 4 and the vent hole, and the piston cylinder 5 is provided with a piston 6 , the piston 6 is connected with the push-pull handle 8 through the U-shaped connecting rod 7, the opening direction of the U-shaped connecting rod 7 is opposite to the opening direction of the piston cylinder 5, and one end of the U-shaped connecting rod 7 is placed in the piston cylinder 5 to connect with the piston 6 Fixedly connected, the other end of the U-shaped connecting rod 7 is placed outside the piston cylinder 5 and fixedly connected with the push-pull handle 8. Two guide rails are arranged on the outer wall of the piston cylinder 5 along the axial direction of the needle cylinder 1, and the push-pull handle 8 is locked. Located on two guide rails, the push-pull handle 8 can be displaced along the direction of the guide rails. A baffle 12 is provided on the side wall near the head end of the syringe 1, and a spring 13 is provided between the baffle 12 and the U-shaped connecting rod 7. One end of the spring 13 is fixed on the baffle plate 12, and the other end of the spring 13 is fixed on the crossbar part of the U-shaped connecting rod 7.

The side wall of the needle 2 is provided with a vent tube 9, the vent tube 9 is a cylindrical body with an open end, the other end of the vent tube 9 is a closed end, and the closed end is spike-shaped, and the vent tube 9 is a closed end. The open end of 9 is arranged toward the needle holder 3, and an air inlet 10 is provided on the side wall of the ventilation pipe 9 close to the closed end, and an air filter membrane is arranged at the opening end of the air inlet 10 and the ventilation pipe 9, and the needle 2 is also sleeved with a retaining ring 11, and the retaining ring 11 is arranged at a position between the air intake hole 10 and the opening end of the ventilation pipe 9.

The use process of the dosing device of the present invention is as follows: when the medicine in the medicine bottle needs to be pumped into the syringe, the needle is first passed through the stopper of the medicine bottle, and the needle is pushed inward until the retaining ring withstands the stopper , and then push the push-pull handle to make the push-pull handle move toward the needle head, and the push-pull handle drives the piston to move toward the needle head to form a negative pressure in the syringe, so that the liquid medicine in the medicine bottle can be sucked into the syringe through the needle. When the liquid medicine in the syringe is squeezed out, push the push-pull handle in the opposite direction (at this time, it will be easier to push the push-pull handle under the elastic force of the spring), so that the push-pull handle moves in the opposite direction to the needle, and the liquid medicine in the syringe Positive pressure is formed, so that the liquid medicine can be pumped out, and the liquid medicine will not touch the piston and connecting rod during the whole process, which can avoid the pollution of the liquid medicine, and in the process of pumping medicine, due to the negative pressure formed in the medicine bottle, the outside air will pass through The open end of the ventilation tube and the air inlet enter into the medicine bottle to maintain the same air pressure inside and outside the medicine bottle, so that the process of pumping medicine is more labor-saving.

Claims (2)

1. A medical injection dosing device, including a syringe (1), a needle (2), a needle seat (3) and a push-pull device, the needle (2) is fixed on the needle seat (3), the syringe (1) The head is connected with the needle seat (3), and it is characterized in that: The tail of the syringe (1) is a closed end, and the side wall of the syringe (1) near the tail is provided with a strip-shaped through hole (4) along the circumferential direction, and the push-pull device includes a piston cylinder (5), a piston (6), U-shaped connecting rod (7) and push-pull handle (8), the piston cylinder (5) is an arc-shaped shell with one end open, and the piston cylinder (5) is attached to the outer wall of the syringe (1) near the tail , the closed end of the piston cylinder (5) is flush with the closed end of the syringe (1), and the opening of the piston cylinder (5) is set towards the head of the syringe (1), and the piston cylinder (5) is close to On the side wall of the closed end, there is a ventilation hole at the position corresponding to the strip-shaped through hole (4). The communication between the piston cylinder (5) and the syringe (1) is realized through the strip-shaped through-hole (4) and the ventilation hole. 5) There is a piston (6) inside, and the piston (6) is connected with the push-pull handle (8) through a U-shaped connecting rod (7). In the opposite direction, one end of the U-shaped connecting rod (7) is fixedly connected to the piston (6) in the piston cylinder (5), and the other end of the U-shaped connecting rod (7) is placed outside the piston cylinder (5) to connect with the push-pull handle ( 8) Fixed connection, the outer wall of the piston cylinder (5) is provided with two guide rails along the axial direction of the syringe (1), the push-pull handle (8) is clamped on the two guide rails, the push-pull handle (8) can be Displacement along the direction of the guide rail, a baffle (12) is provided on the side wall of the syringe (1) close to the head end, and a spring (13) is provided between the baffle (12) and the U-shaped connecting rod (7), One end of the spring (13) is fixed on the baffle (12), and the other end of the spring (13) is fixed on the crossbar part of the U-shaped connecting rod (7); A ventilation tube (9) is provided on the side wall of the needle (2), the ventilation tube (9) is a cylindrical tube body with one end open, the other end of the ventilation tube (9) is a closed end, and the closed end is Spike-shaped, the opening end of the ventilation tube (9) is set towards the needle seat (3), and the side wall of the ventilation tube (9) close to the closed end is provided with an air inlet (10), the air inlet (10) Air filter membranes are provided at the opening ends of the ventilation pipe (9), and a retaining ring (11) is set on the needle (2), and the retaining ring (11) is arranged on the air inlet (10) and the ventilation pipe (9) between the open ends. 2. A medical injection dosing device according to claim 1, characterized in that: the material of the needle holder (3) is plastic.