Syringe

Abstract

The utility model discloses an injector, and relates to the field of medical instruments. The utility model provides an injector which can filter out small particles in an injection solution and prevent the small particles from being injected into a human body. The injector comprises a needle cylinder and a needle head connected to the front end of the needle cylinder, the needle cylinder is provided with a needle cylinder liquid hole, and the needle head is communicated with the needle cylinder liquid hole; the device further comprises a filtering structure; the needle cylinder is provided with a valve rod hole formed in the radial direction of the needle cylinder, and the valve rod hole intersects with the needle cylinder liquid hole. The filtering structure comprises a valve rod, a filtering membrane and a one-way valve, the valve rod penetrates through the valve rod hole and is matched with the valve rod hole, the valve rod hole limits rotation of the valve rod, the valve rod is provided with a first valve rod liquid hole and a second valve rod liquid hole which are formed in the length direction of the valve rod at intervals, and the first valve rod liquid hole is communicated with the needle cylinder liquid hole; the filtering membrane and the one-way valve are arranged in the first valve rod liquid hole, and the one-way valve is located in front of the filtering membrane and can be opened backwards in a one-way mode; the valve rod moves along the valve rod hole so that the second valve rod liquid hole can be communicated with the needle cylinder liquid hole.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to a syringe. Background Art

[0002] Powder injection is a commonly used injection or infusion medicine. The container for powder injection is generally a glass medicine bottle, which is covered with a rubber stopper to achieve sealing. The rubber stopper is also covered with an aluminum cap to fix and seal the rubber stopper. When using powder injection, first use a syringe to draw sterile water for injection; then use a syringe to pierce the rubber stopper and inject sterile water for injection into the glass bottle, and the powder injection dissolves in the sterile water for injection to form an injection solution; then use a syringe to draw out the injection solution for standby use.

[0003] In the above process, the needle of the syringe may pierce the rubber stopper, resulting in some rubber stopper fragments, or the injection solution may contain tiny injection particles due to the dissolution of trace injection powder. If these powders or particles are injected into the human body, they may affect the patient's health and should be avoided as much as possible. Therefore, some syringes with filtering functions have emerged.

[0004] For example, the patent with application number 200820065520.0 discloses a disposable filter syringe, which mainly includes a syringe, and a filter is arranged between the syringe and the needle. A filter membrane is arranged inside the filter, and connectors are arranged at both ends to connect the syringe and the needle respectively. This patent ensures the relative purity of the medicine sucked into the syringe by installing a filter structure between the syringe and the needle to filter possible impurities through the filter.

[0005] Although the above patent can prevent tiny particles from being sucked into the syringe together with the injection solution, the injection solution needs to be discharged afterwards, and the tiny particles attached to the filter membrane will be flushed out during the discharge of the injection solution. The filtration is actually ineffective and the tiny particles are not prevented from entering the human body. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a syringe which can filter out tiny particles in an injection solution and prevent the tiny particles from being injected into a human body.

[0007] The technical solution adopted to solve the above problems is: the syringe includes a syringe and a needle connected to the front end of the syringe, the syringe is provided with a syringe liquid hole, and the needle is connected to the syringe liquid hole; it also includes a filtering structure; the syringe is provided with a valve stem hole arranged along the radial direction of the syringe, and the valve stem hole intersects with the syringe liquid hole; the filtering structure includes a valve stem, a filter membrane and a one-way valve, the valve stem passes through the valve stem hole and cooperates with the valve stem hole, the valve stem hole limits the rotation of the valve stem, the valve stem is provided with a first valve stem liquid hole and a second valve stem liquid hole arranged at intervals along the length direction of the valve stem, the first valve stem liquid hole is connected to the syringe liquid hole, the filter membrane and the one-way valve are arranged in the first valve stem liquid hole, the one-way valve is located in front of the filter membrane, and the one-way valve can be opened unidirectionally toward the filter membrane; the valve stem moves along the valve stem hole to enable the second valve stem liquid hole to be connected to the syringe liquid hole.

[0008] Furthermore, the cross-sectional shapes of the valve stem hole and the valve stem are both rounded squares.

[0009] Furthermore, the filtering structure includes a first positioning piece and a second positioning piece, which are respectively located on both sides of the syringe and connected to the valve stem, the first positioning piece fits the syringe, and there is a distance between the second positioning piece and the syringe; when the valve stem moves until the second valve stem liquid hole is connected to the syringe liquid hole, the second positioning piece fits the syringe.

[0010] Furthermore, the syringe comprises a sealing ring, which is arranged between the valve stem hole and the valve stem.

[0011] Furthermore, the syringe comprises a spacing structure which is detachably arranged between the second positioning piece and the syringe, and the spacing structure restricts the second positioning piece from moving toward the syringe.

[0012] Furthermore, the spacing structure is an elastic spacing sleeve sleeved on the valve stem, and the elastic spacing sleeve is provided with a removal notch.

[0013] Furthermore, the filter membrane is a microporous filter membrane.

[0014] Furthermore, the one-way valve is a conical silicone sheet, and the silicone sheet has three to four slits extending outward from the center of the silicone sheet.

[0015] The beneficial effects of the utility model are: when the utility model draws the injection solution, Figure 2 As shown, the liquid hole of the first valve stem is connected to the liquid hole of the syringe; when the injection solution is sucked, the one-way valve opens, and the injection solution flows through the filter membrane to achieve filtration; the filtered tiny particles adhere to the side of the filter membrane facing the needle. After the liquid is sucked, the one-way valve automatically closes because no liquid flows through. The significance of the automatic closure of the one-way valve is to prevent tiny particles attached to the filter membrane from falling into the needle and adhering to the wall of the needle hole.

[0016] When the injection solution is discharged, the valve stem is moved to connect the second valve stem liquid hole with the syringe liquid hole, and then the injection solution is discharged. In this way, the injection solution is discharged from the second valve stem liquid hole without carrying tiny particles.

[0017] It can be seen that the utility model has the beneficial effect of preventing tiny particles from being output into the human body, making the injection safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a diagram of the structure of the syringe;

[0019] Figure 2 This is an enlarged view of the front end of the syringe;

[0020] Figure 3 yes Figure 2 AA section view;

[0021] Figure 4 yes Figure 2 BB cross-sectional view;

[0022] Figure 5 It is a diagram of the interval structure;

[0023] Figure 6 It is a structural diagram of the syringe in the liquid medicine output state;

[0024] Marked in the figure are: syringe 1, syringe liquid hole 11, valve stem hole 12, needle 2, filter structure 3, valve stem 31, first valve stem liquid hole 311, second valve stem liquid hole 312, filter membrane 32, one-way valve 33, slit 331, first positioning piece 34, second positioning piece 35, sealing ring 4, spacing structure 5, and notch 51. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0026] like Figures 1 to 4As shown, the syringe includes a syringe 1 and a needle 2 connected to the front end of the syringe 1, the syringe 1 has a syringe liquid hole 11, and the needle 2 is connected to the syringe liquid hole 11; it also includes a filtering structure 3; the syringe 1 has a valve stem hole 12 arranged along the radial direction of the syringe 1, and the valve stem hole 12 intersects with the syringe liquid hole 11; the filtering structure 3 includes a valve stem 31, a filter membrane 32 and a one-way valve 33, the valve stem 31 passes through the valve stem hole 12 and cooperates with the valve stem hole 12, the valve stem hole 12 limits the rotation of the valve stem 31, and the valve stem 3 1 has a first valve stem liquid hole 311 and a second valve stem liquid hole 312 arranged at intervals along the length direction of the valve stem 31, the first valve stem liquid hole 311 is connected with the syringe liquid hole 11, the filter membrane 32 and the one-way valve 33 are arranged in the first valve stem liquid hole 311, the one-way valve 33 is located in front of the filter membrane 32, and the one-way valve 33 can be opened in one direction toward the filter membrane 32; the valve stem 31 moves along the valve stem hole 12 to make the second valve stem liquid hole 312 connected with the syringe liquid hole 11.

[0027] When the utility model draws the injection solution, Figure 2 As shown, the first valve stem liquid hole 311 is connected to the syringe liquid hole 11; when the injection solution is sucked, the one-way valve 33 is opened, and the injection solution flows through the filter membrane 32 to be filtered; the filtered tiny particles adhere to the side of the filter membrane 32 facing the needle 2. After the liquid is sucked, the one-way valve 33 automatically closes because no liquid flows through. The significance of the automatic closing of the one-way valve 33 is to prevent the tiny particles attached to the filter membrane 32 from falling into the needle 2 and adhering to the wall surface of the needle 2 hole.

[0028] When the injection solution is then delivered, Figure 6 As shown, the valve stem 31 is moved to make the second valve stem liquid hole 312 communicate with the syringe liquid hole 11, and then the injection solution is output. In this way, the injection solution is output from the second valve stem liquid hole 312 without carrying tiny particles.

[0029] It can be seen that the utility model has the beneficial effect of preventing tiny particles from being output to the human body, making injection safer. When switching between sucking and outputting the liquid medicine, the valve stem 31 needs to be moved, and the operation is very simple, just pressing the valve stem 31.

[0030] The valve stem hole 12 needs to limit the rotation of the valve stem 31, otherwise it cannot ensure that the first valve stem liquid hole 311 or the second valve stem liquid hole 312 is connected to the syringe liquid hole 11. For this purpose, the following settings can be made: the cross-sectional shapes of the valve stem hole 12 and the valve stem 31 are both rounded squares.

[0031] As mentioned above, when the utility model is used, the valve stem 31 needs to be moved to make the second valve stem liquid hole 312 communicate with the syringe liquid hole 11. In order to ensure that this effect is achieved when the valve stem 31 is moved, the filter structure 3 preferably includes a first positioning piece 34 and a second positioning piece 35, the first positioning piece 34 and the second positioning piece 35 are respectively located on both sides of the syringe 1 and connected to the valve stem 31, the first positioning piece 34 fits with the syringe 1, and there is a distance between the second positioning piece 35 and the syringe 1; when the valve stem 31 moves until the second valve stem liquid hole 312 is connected with the syringe liquid hole 11, the second positioning piece 35 fits with the syringe 1.

[0032] In this way, when switching between inhaling the injection solution and outputting the injection solution, it is only necessary to press the second positioning sheet 35 to make it fit with the syringe 1. The valve stem 31 and the valve stem hole 12 can specifically be a small interference fit, so that there is a certain resistance to the movement of the valve stem 31 to prevent the valve stem 31 from moving at will and maintain a seal with the valve stem hole 12. However, to ensure this effect, the manufacturing precision of parts is relatively high, and the syringe may also include a sealing ring 4, which is arranged between the valve stem hole 12 and the valve stem 31. In this way, the compression of the sealing ring 4 ensures the seal, and at the same time, there is a certain resistance to the movement of the valve stem 31. The sealing ring 4 can be a common O-ring.

[0033] In order to further prevent the valve stem 31 from moving before the syringe is used, the following arrangement may be made: the syringe includes a spacing structure 5, which is disposed between the second positioning piece 35 and the syringe 1 and is detachable, and the spacing structure 5 restricts the second positioning piece 35 from moving toward the syringe 1. In this way, due to the effect of the spacing structure disposed between the second positioning piece 35 and the syringe 1, the valve stem 31 will not move.

[0034] The spacer structure 5 can be specifically as follows Figure 5 As shown, the spacing structure 5 is an elastic spacing sleeve mounted on the valve stem 31, and the elastic spacing sleeve has a removal notch 51. Obviously, the width of the removal notch 51 is smaller than the diameter of the valve stem 31, and the elastic spacing sleeve is not easy to leave the valve stem 31 without special human intervention. When the valve stem 31 is to be moved, the elastic spacing sleeve is pulled outward, the removal notch 51 is opened, and the spacing structure can be removed. The elastic spacing sleeve can be made of elastic plastic.

[0035] The filter membrane 32 is a microporous filter membrane, which is a common filter membrane and is widely used in filtering medical liquids, and is suitable for the use of the present invention.

[0036] The one-way valve 33 is also an existing structure, that is, the one-way valve 33 is a conical silicone sheet with three to four slits 331 extending outward from the center of the silicone sheet. The liquid flows due to the pressure difference and can open the one-way valve 33. If no liquid passes through, the one-way valve 33 is closed by the elastic rebound of the material itself.

Claims

1. A syringe, comprising a syringe (1) and a needle (2) connected to the front end of the syringe (1), wherein the syringe (1) has a syringe liquid hole (11), and the needle (2) is connected to the syringe liquid hole (11); characterized in that: The invention comprises a filtering structure (3); a syringe (1) having a valve stem hole (12) arranged along the radial direction of the syringe (1), the valve stem hole (12) intersecting with the syringe liquid hole (11); the filtering structure (3) comprising a valve stem (31), a filtering membrane (32) and a one-way valve (33); the valve stem (31) passes through the valve stem hole (12) and cooperates with the valve stem hole (12); the valve stem hole (12) restricts the rotation of the valve stem (31); the valve stem (31) has first valve stem liquid holes arranged at intervals along the length direction of the valve stem (31) (311) and a second valve stem liquid hole (312), the first valve stem liquid hole (311) is connected to the syringe liquid hole (11), the filter membrane (32) and the one-way valve (33) are arranged in the first valve stem liquid hole (311), the one-way valve (33) is located in front of the filter membrane (32), and the one-way valve (33) can be opened in one direction toward the filter membrane (32); the valve stem (31) moves along the valve stem hole (12) to enable the second valve stem liquid hole (312) to be connected to the syringe liquid hole (11).

2. The syringe according to claim 1, characterized in that: The cross-sectional shapes of the valve stem hole (12) and the valve stem (31) are both rounded squares.

3. The syringe according to claim 2, characterized in that: The filtering structure (3) comprises a first positioning piece (34) and a second positioning piece (35), the first positioning piece (34) and the second positioning piece (35) are respectively located on both sides of the syringe (1) and connected to the valve stem (31), the first positioning piece (34) is in close contact with the syringe (1), and there is a distance between the second positioning piece (35) and the syringe (1); when the valve stem (31) moves until the second valve stem liquid hole (312) is connected to the syringe liquid hole (11), the second positioning piece (35) is in close contact with the syringe (1).

4. The syringe according to claim 3, characterized in that: The valve stem comprises a sealing ring (4), wherein the sealing ring (4) is arranged between the valve stem hole (12) and the valve stem (31).

5. The syringe according to claim 4, characterized in that: It comprises a spacing structure (5) which is arranged between the second positioning piece (35) and the syringe (1) and can be removed. The spacing structure (5) limits the movement of the second positioning piece (35) toward the syringe (1).

6. The syringe according to claim 5, characterized in that: The spacing structure (5) is an elastic spacing sleeve sleeved on the valve stem (31), and a removal notch (51) is provided on the elastic spacing sleeve.

7. The syringe according to claim 6, characterized in that: The filter membrane (32) is a microporous filter membrane.

8. The syringe according to claim 7, characterized in that: The one-way valve (33) is a conical silicone sheet, and the silicone sheet has three to four slits (331) extending outward from the center of the silicone sheet.

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