CN219595390U - Pressure injector convenient for extraction - Google Patents

Abstract

The utility model discloses a pressure injector convenient to extract, which comprises a needle cylinder and a needle head, wherein the needle head is arranged at one end of the needle cylinder, and a pressure valve is arranged at the end of the needle cylinder connected with the needle head. In summary, the above technical scheme has the following beneficial effects: one end of the needle cylinder is connected with the needle head, the other end of the needle cylinder is connected with the outside, when the needle head is penetrated into the anterior chamber from the cornice limbus, aqueous humor flows from the needle head to the needle cylinder direction because of intraocular pressure in the anterior chamber, a pressure valve is arranged at one end of the needle cylinder connected with the needle head, a certain pressure is required for opening the pressure valve, namely, when the aqueous humor pressure is larger than a pressure threshold value for opening the pressure valve, aqueous humor can seep into the needle cylinder from the pressure valve, and thus the aqueous humor extraction is completed.

Description

Pressure injector convenient for extraction

Technical Field

The utility model relates to the technical field of syringes, in particular to a pressure syringe convenient to extract.

Background

Intraocular pressure (Intraocular pressure, IOP), also known as intraocular pressure, is the pressure of the contents of the eye against the inner wall of the eye. Intraocular pressure varies at various times of the day, but is generally maintained within a safe range. The normal eye pressure range of the normal person is 11-21 mmHg (1.47-2.79 kPa), so that the normal form of the eyeball is maintained, and the interface of each refractive medium is kept in a good refractive state. The contents of the eyeball include Aqueous humor (Aqueous humor), crystalline lens, vitreous body, among which Aqueous humor is the most influencing intraocular pressure. The aqueous humor is colorless transparent liquid, belongs to one of tissue fluids, is filled between the cornea and the iris of the anterior and posterior chamber, has the total volume of only 0.15-0.3 mL (about 0.25mL on average), and has the function of nourishing the iris, the cornea and the crystalline lens. The aqueous humor also has a certain refraction function, and forms an eyeball refraction system together with cornea, crystalline lens and vitreous body. Aqueous humor is continuously produced by the ciliary body, then enters the anterior chamber through the pupil, and then exits the eyeball through the trabecular meshwork at the anterior chamber angle into the blood circulation.

Clinically, for analysis of aqueous humor sampling of ocular infections, or in diagnosis of certain ophthalmic diseases, it is often necessary to perform pathogen culture by aqueous humor sampling, and detection of cytologic, pathogenic DNA, etc., to identify infectious, non-infectious uveitis and camouflage syndrome. Infection, autoimmune disease (the immune system of the patient attacks its own tissues), or other unknown factors can all lead to inflammation of the uvea, etc. In addition, anterior chamber puncture is often used in the treatment of fluid discharge in cases of chemical alkali burns of the eye, anterior chamber hematocele, and the like.

Since aqueous humor is kept at a certain intraocular pressure, in order to detect the intraocular pressure when the aqueous humor is extracted, the prior art provides a pressure sensor on the piston. However, such a solution results in manual extraction of aqueous humor, is too cumbersome, and the syringe is a disposable item, which is too costly to provide with a pressure sensor.

Therefore, how to conveniently extract the aqueous humor without making the intraocular pressure too low is the technical problem to be solved by the utility model.

Disclosure of Invention

Aiming at the defects in the prior art, the pressure injector convenient to extract is provided, and the intraocular pressure can be controlled according to the pressure valve through the pressure injector convenient to extract, so that the intraocular pressure is prevented from being too low.

In order to achieve the above purpose, the following technical scheme is provided:

the pressure injector convenient to draw comprises a needle cylinder and a needle head, wherein the needle head is arranged at one end of the needle cylinder, and a pressure valve is arranged at one end of the needle cylinder connected with the needle head.

In summary, the above technical scheme has the following beneficial effects: one end of the needle cylinder is connected with the needle head, the other end of the needle cylinder is connected with the outside, when the needle head is penetrated into the anterior chamber from the cornice limbus, aqueous humor flows from the needle head to the needle cylinder direction because of intraocular pressure in the anterior chamber, a pressure valve is arranged at one end of the needle cylinder connected with the needle head, a certain pressure is required for opening the pressure valve, namely, when the aqueous humor pressure is larger than a pressure threshold value for opening the pressure valve, aqueous humor can seep into the needle cylinder from the pressure valve, and thus the aqueous humor extraction is completed. Specifically, the pressure threshold for opening the pressure valve is larger than the minimum value of the eye pressure range of a human body, so when the intraocular pressure is smaller than 11mmHg, the pressure valve cannot be opened, and the aqueous humor cannot flow into the needle cylinder, so that the aqueous humor is kept within the normal intraocular pressure range. The pressure threshold at which the pressure valve opens depends on the material and thickness of the pressure valve, the thinner the pressure valve of the same material, the smaller the pressure threshold.

Drawings

FIG. 1 is a schematic view of a syringe structure of a pressure injector with convenient extraction;

FIG. 2 is a schematic view of a conical barrel of a pressure syringe for easy extraction;

FIG. 3 is a schematic illustration of a cross-section A-A of a pressure injector with convenient extraction;

FIG. 4 is a schematic view in section B-B of a pressure injector with convenient extraction;

FIG. 5 is a schematic view of a cross-section C-C of a pressure injector with ease of extraction;

fig. 6 is a schematic view of the structure of the air outlet of the pressure injector which is convenient to draw.

Reference numerals: 10. a needle cylinder; 11. a conical cylinder; 12. a cylinder barrel; 20. a needle; 30. a pressure valve; 40. a control cover; 41. a control chamber; 42. an opening; 43. an air outlet hole; 44. a clamping edge; 50. a control block; 51. matching holes; 52. a clamping block; 60. pressing the blocks; 70. an elastic member.

Detailed Description

The utility model will now be described in further detail with reference to the drawings and examples. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "back", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "bottom" and "top", "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.

As shown in fig. 1-3, a pressure injector capable of being conveniently extracted comprises a syringe 10 and a needle 20, wherein the needle 20 is arranged at one end of the syringe 10, and a pressure valve 30 is arranged at the end of the syringe 10 connected with the needle 20. One end of the syringe 10 is connected with the needle 20, the other end is connected with the outside, when the needle 20 is penetrated into the anterior chamber from the cornice limbus, because the anterior chamber has intraocular pressure, aqueous humor can flow from the needle 20 to the syringe 10, one end of the syringe 10 connected with the needle 20 is provided with the pressure valve 30, a certain pressure is required for opening the pressure valve 30, namely, when the aqueous humor pressure is greater than the pressure threshold value for opening the pressure valve 30, aqueous humor can seep into the syringe 10 from the pressure valve 30, and thus the aqueous humor extraction is completed. Specifically, the pressure threshold at which the pressure valve 30 opens is greater than the minimum value of the range of eye pressure of a human, so that when the intraocular pressure is less than 11mmHg, the pressure valve 30 does not open, and aqueous humor does not flow into the syringe 10, thereby maintaining the aqueous humor within the normal ocular pressure range. The pressure threshold at which the pressure valve 30 opens depends on the material and thickness of the pressure valve 30, the thinner the pressure valve 30 of the same material, the smaller the pressure threshold.

The syringe 10 comprises a conical barrel 11 and a cylindrical barrel 12, the conical barrel 11 is conical, the smaller end of the conical barrel 11 is connected with the needle 20, the larger end is connected with the cylindrical barrel 12, and the pressure valve 30 is arranged at the smaller end of the conical barrel 11. Because the volume of aqueous humor collection is less, so through setting up toper section of thick bamboo 11, aqueous humor gets into toper section of thick bamboo 11 at first after getting into from syringe needle 20, toper section of thick bamboo 11 and cylinder section of thick bamboo 12 are transparent material, can observe the volume of aqueous humor better in toper section of thick bamboo 11. The cylinder 12 is for grasping by a physician.

The volume of the tapered cylinder 11 is 0.05 ml or more and 0.1 ml or less. The amount of aqueous humor is usually between 0.05 ml and 0.1 ml, and the volume of the conical barrel 11 is set between 0.05 ml and 0.1 ml by taking most 0.1 ml, so that whether the amount of aqueous humor reaches the requirement or not can be conveniently observed during taking. Because the joint of the conical barrel 11 and the cylindrical barrel 12 is provided with a gap, the observation is convenient. Preferably, the volume of the cone 11 is 0.1 ml.

The pressure valve 30 is provided with four pieces, the four pieces of pressure valve 30 are encircled to form a circle to enclose the nozzle at the smaller end of the conical cylinder 11, and the four pieces of pressure valve 30 are respectively connected with the nozzle of the conical cylinder 11. The four pressure valves 30 are in the shape of a sector with the same shape and size, the radian of the sector is 90 degrees, so that the four pressure valves 30 can be encircled to form a circle, the arc edges of the four pressure valves 30 are connected with the cylinder mouth at the smaller end of the conical cylinder 11, and the four pressure valves 30 are contacted with each other but not connected with each other, so that a diaphragm with certain pressure is formed. Accordingly, other numbers of pressure valves 30 have different fan curvature, so that four pressure valves 30 are preferred, as can be rounded. If there is only one pressure valve 30, the pressure valve 30 is circular, the arc edge of the pressure valve 30 is not completely connected with the conical barrel 11, the radian of the arc edge connected with the conical barrel 11 also affects the magnitude of the pressure threshold, and the pressure valve 30 is adjusted according to the condition affecting the pressure threshold, so that the requirement is met.

As shown in fig. 4-6, a detachable control cover 40 is arranged on the cylindrical barrel 12, a control cavity 41 is arranged in the control cover 40, an opening 42 is formed in the side wall of the control cover 40 in the control cavity 41, an air outlet hole 43 is formed in the control cover 40 along the axial direction of the cylindrical barrel 12, and the air outlet hole 43 is communicated with the control cavity 41; a control block 50 is arranged in the control cavity 41, a pressing block 60 extends outwards from the opening 42 of the control block 50, an elastic piece 70 is arranged on one side of the control block 50 away from the pressing block 60, and a matching hole 51 is formed in the control block 50 along the axial direction of the cylinder barrel 12. The control block 50 is used for controlling whether the cylinder 12 is communicated with the outside, when the elastic member 70 is in a natural state, the matching hole 51 is aligned with the air outlet hole 43, the cylinder 12 is communicated with the outside through the air outlet hole 43 and the matching hole 51, when the control block 50 is pushed into the control cavity 41 by pressing the pressing block 60, the matching hole 51 is staggered with the air outlet hole 43, and the cylinder 12 is isolated from the outside, so that a relatively sealed space is formed. When the cylinder 12 is communicated with the outside, aqueous humor can enter the cylinder 12 through the needle 20, when the cylinder 12 is isolated from the outside, aqueous humor cannot enter the cylinder 12 through the needle 20, and because the control block 50 moves along the plane of the cylinder 12 in the circumferential direction, the pressure in the cylinder 12 cannot be influenced in the control process, and aqueous humor in the cylinder 12 cannot be pushed out or sucked more because of the movement of the control block 50.

When in use, a doctor firstly controls the needle 20 to pierce the anterior chamber, at the moment, the cylinder 12 is the same as the outside, if the pressure of the aqueous humor is larger than the pressure threshold value of the pressure valve 30, the aqueous humor can enter the cylinder 12, when the doctor judges that the acquired aqueous humor volume meets the requirement, the doctor presses down quickly, the aqueous humor is controlled to stop flowing into the cylinder 12, and finally the needle 20 is pulled out. After the needle 20 is pulled out, the pressing block 60 needs to be pressed all the time, so that the cylinder 12 is kept in a relatively sealed environment, aqueous humor in the cylinder 12 cannot flow out due to the swing during transfer, and external pollutants can be prevented from entering the cylinder 12. When the aqueous humor in the cylindrical barrel needs to be taken out, the control cap 40 can be removed, the piston of the conventional syringe 10 can be put on for taking out, or air can be blown into the air outlet hole 43 through the balloon which can be blown in to take out the aqueous humor.

The control block 50 is provided with an engaging block 52 at a side away from the pressing block 60, and the engaging block 52 is used for engaging the elastic member 70. The engaging block 52 is cylindrical, the elastic member 70 is a spring, and the inner diameters of the engaging block 52 and the elastic member 70 are matched, so that the elastic member 70 is engaged.

The end of the control cap 40 connected with the cylinder 12 is provided with a clamping edge 44, and the clamping edge 44 is used for clamping into the cylinder 12. The engaging edge 44 is made of rubber or silica gel, and the outer diameter of the engaging edge 44 is slightly larger than the inner diameter of the cylindrical barrel 12, so that the control cover 40 tightly covers the cylindrical barrel 12.

The above is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that modifications and adaptations to the present utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims (7)

1. The utility model provides a pressure syringe of convenient extraction, includes cylinder (10) and syringe needle (20), syringe needle (20) set up the one end at cylinder (10), its characterized in that, the one end that cylinder (10) and syringe needle (20) are connected is provided with pressure valve (30).

2. The pressure injector with convenient extraction according to claim 1, characterized in that the needle cylinder (10) comprises a conical cylinder (11) and a cylindrical cylinder (12), the conical cylinder (11) is conical, the smaller end of the conical cylinder (11) is connected with the needle head (20), the larger end is connected with the cylindrical cylinder (12), and the pressure valve (30) is arranged at the smaller end of the conical cylinder (11).

3. The pressure syringe capable of being withdrawn conveniently according to claim 2, characterized in that the volume of the cone (11) is greater than or equal to 0.05 ml and less than or equal to 0.1 ml.

4. The pressure injector with convenient extraction according to claim 2, characterized in that the pressure valve (30) is provided with four pieces, the four pieces of the pressure valve (30) are round and enclose the nozzle at the smaller end of the conical barrel (11), and the four pieces of the pressure valve (30) are respectively connected with the nozzle of the conical barrel (11).

5. The pressure injector convenient for extraction according to claim 2, characterized in that a separable control cover (40) is arranged on the cylindrical barrel (12), a control cavity (41) is arranged in the control cover (40), an opening (42) is formed at the side wall of the control cover (40) in the control cavity (41), an air outlet hole (43) is formed in the control cover (40) along the axial direction of the cylindrical barrel (12), and the air outlet hole (43) is communicated with the control cavity (41);

the control cavity (41) is internally provided with a control block (50), the control block (50) is outwards extended from the opening (42) to form a pressing block (60), one side, far away from the pressing block (60), of the control block (50) is provided with an elastic piece (70), and the control block (50) is provided with a matching hole (51) along the axial direction of the cylindrical barrel (12).

6. The pressure injector with convenient extraction according to claim 5, characterized in that the control block (50) is provided with a clamping block (52) at a side far away from the pressing block (60), and the clamping block (52) is used for clamping the elastic piece (70).

7. The pressure injector with convenient extraction according to claim 5, characterized in that the end of the control cap (40) connected to the cylinder (12) is provided with a snap-in edge (44), said snap-in edge (44) being adapted to snap into the cylinder (12).