Sample injection needle stable in sample injection

Abstract

The utility model relates to the technical field of sample injection needles, in particular to a sample injection needle stable in sample injection, which comprises a needle cylinder body, a needle tube body mounted at the bottom of the needle cylinder body and a piston rod mounted at the top of the needle cylinder body, and further comprises a lantern ring movably sleeved on the surface of the needle cylinder body, the bottom of the vertical plate is fixedly connected with a guide cylinder; the lifting position of the needle tube body can be limited, so that the needle tube body can smoothly enter the sample injection port, the situation that the needle tube body is slantly punctured can be reduced, in addition, when the sample injection needle is used, after a sample is injected, the needle tube body can be driven to be rapidly pulled out of the sample injection port through the cooperation of the extension spring, and the sample injection needle is convenient to use. The problems that when part of sample injection needles are used at present, the requirement for experience of operators is high, and when part of sample injection needles are used, the service life of the sample injection needles is affected, and normal sample injection operation is conducted due to the fact that part of sample injection needles are prone to being pricked obliquely are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection needles, in particular to an injection needle with stable injection. Background Art

[0002] An injection needle is a commonly used tool in laboratories, mainly used to manually inject samples into analytical instruments. This type of injection needle usually consists of a slender needle tube, a syringe, and a piston rod connected to the syringe. The needle tube is used to absorb and hold the sample to be tested, while the piston rod can be used to control the sample injection process.

[0003] At present, injection needles are mainly divided into manual injection needles and automatic injection needles. Manual injection needles are widely used in experiments because of their economic benefits, simple operation without programming, and flexibility in use. However, some manual injection needles currently have certain requirements on the proficiency of operators when used. Operators with less experience may find it difficult to get the needle into the injection port of the analyzer when using some of the current injection needles. In addition, the injection needle is prone to be skewed and bent during use, which will affect subsequent use. Utility Model Content

[0004] The utility model aims to provide a sampling needle with stable sampling, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical solution: a stable injection needle, comprising a syringe body, a needle tube body installed at the bottom of the syringe body, and a piston rod installed at the top of the syringe body, and also includes:

[0006] A sleeve movably sleeved on the surface of the syringe body, the bottom of the sleeve is fixedly connected to a vertical plate, the bottom of the vertical plate is fixedly connected to a guide cylinder, the surface of the needle tube body is in contact with the inner wall of the guide cylinder, and a fixing mechanism is installed on the surface of the guide cylinder;

[0007] A limiting mechanism is installed on the surface of the syringe body, the surface of the limiting mechanism is provided with a disc, the surface of the disc is fixedly connected with a clamping plate, the top of the ring is provided with a sliding groove, the surface of the vertical plate is provided with a groove, and the bottom of the inner wall of the groove is provided with a through groove.

[0008] Preferably, a slot is provided above the surface of the vertical plate, and the surface of the card plate is in contact with the inner wall of the slot.

[0009] Preferably, the fixing mechanism comprises a connecting rod with one end fixedly connected to the surface of the guide cylinder and a fixing ring fixedly connected to the bottom of the other end of the connecting rod. There are several connecting rods, and a protruding structure is provided on the inner surface of the fixing ring.

[0010] Preferably, the limiting mechanism includes an extension plate fixedly connected to the surface of the syringe body, a sliding rod fixedly connected to the top of the extension plate, and a tension spring sleeved on the surface of the sliding rod, the two ends of the tension spring are respectively fixedly connected to the top of the extension plate and the bottom of the disc, the surface of the sliding rod is in contact with the inner wall of the sliding groove, the sliding rod slides through the disc, and the surface of the extension plate is in contact with the inner walls of the slot and the through groove.

[0011] Preferably, a groove is provided at the bottom of the collar, the slide groove is connected to the groove, and the top of the slide rod is in contact with the top of the inner wall of the groove.

[0012] Preferably, the shape of the longitudinal section of the card plate is L-shaped, and the length of the card plate is greater than the depth of the inner wall of the card slot.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0014] When the utility model is in use, an operator can limit the lifting position of the needle tube body by sleeve-mounting the fixing mechanism at the injection port of the analytical instrument, so that the needle tube body can smoothly enter the injection port, and the situation that the needle tube body is skewed can be reduced. In addition, when the utility model is in use, after the sample is injected, the needle tube body can be quickly pulled out of the injection port by the cooperation of the tension spring, so that the needle tube body can be stably moved up, which solves the problem that some current injection needles have high requirements on the experience of the operator when in use, and some injection needles are prone to skewness when in use, which affects the service life of the injection needle and the normal injection operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0016] Figure 2 It is a partial three-dimensional structural schematic diagram of the utility model;

[0017] Figure 3 It is a partial three-dimensional structural schematic diagram of the utility model;

[0018] Figure 4 It is a partial three-dimensional structural diagram of the cooperation of the limiting mechanism, the disc and the clamping plate in the utility model;

[0019] Figure 5 It is a schematic diagram of a partial three-dimensional cross-sectional structure of the utility model.

[0020] In the figure: 1. syringe body; 2. needle tube body; 3. collar; 4. vertical plate; 5. guide cylinder; 6. fixing mechanism; 61. connecting rod; 62. fixing ring; 7. limiting mechanism; 71. extension plate; 72. sliding rod; 73. tension spring; 8. disc; 9. clamping plate; 10. slide groove; 11. groove; 12. clamping groove; 13. slot; 14. through groove. DETAILED DESCRIPTION

[0021] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0022] See also Figure 1-5 As shown, a stable injection needle comprises a syringe body 1, a needle tube body 2 installed at the bottom of the syringe body 1 and a piston rod installed at the top of the syringe body 1. A sleeve is movably provided on the surface of the syringe body 1, a vertical plate 4 is fixedly connected to the bottom of the sleeve 3, a guide cylinder 5 is fixedly connected to the bottom of the vertical plate 4, the surface of the needle tube body 2 contacts the inner wall of the guide cylinder 5, a fixing mechanism 6 is installed on the surface of the guide cylinder 5, a limiting mechanism 7 is installed on the surface of the syringe body 1, a disc 8 is provided on the surface of the limiting mechanism 7, a clamping plate 9 is fixedly connected to the surface of the disc 8, a slide groove 10 is provided on the top of the sleeve 3, a clamping groove 12 is provided above the surface of the vertical plate 4, the surface of the clamping plate 9 contacts the inner wall of the clamping groove 12, the height of the disc 8 can be controlled by the coordinated use of the clamping groove 12 and the clamping plate 9, a groove 13 is provided on the surface of the vertical plate 4, and a through groove 14 is provided at the bottom of the inner wall of the groove 13.

[0023] The operator presses the piston rod to inject the sample in the syringe body 1 through the needle body 2 into an analytical instrument, such as a liquid chromatograph. This is a mature technology and will not be described in detail here.

[0024] The fixing mechanism 6 includes a connecting rod 61 and a fixing ring 62. There are several connecting rods 61. One end of the connecting rod 61 is fixedly connected to the surface of the guide cylinder 5. The fixing ring 62 is fixedly connected to the bottom of the other end of the connecting rod 61. The inner surface of the fixing ring 62 is provided with a protruding structure. Through the setting of the connecting rod 61, the fixing ring 62 and the protruding structure on the inner surface of the fixing ring 62, it is convenient for the operator to put the fixing ring 62 on the surface of the analytical instrument, such as the surface of the liquid chromatograph injection port, so as to determine the position of the injection needle.

[0025] The limiting mechanism 7 includes an extension plate 71, a sliding rod 72 and a tension spring 73. The extension plate 71 is fixedly connected to the surface of the syringe body 1, the sliding rod 72 is fixedly connected to the top of the extension plate 71, and the tension spring 73 is sleeved on the surface of the sliding rod 72. The two ends of the tension spring 73 are fixedly connected to the top of the extension plate 71 and the bottom of the disc 8 respectively. The surface of the sliding rod 72 contacts the inner wall of the slide groove 10, and the surface of the extension plate 71 contacts the inner walls of the slot 13 and the through groove 14. A groove 11 is provided at the bottom of the ring 3, and the slide groove 10 is connected to the groove 11. The top of the sliding rod 72 contacts the top of the inner wall of the groove 11. By using the sliding rod 72 and the groove 11 in coordination, the movable range of the limiting mechanism 7 can be fixed, thereby limiting the position of the syringe body 1 and the ring 3, and the sliding rod 72 slides through the disc 8.

[0026] The shape of the longitudinal section of the clamping plate 9 is L-shaped, and the length of the clamping plate 9 is greater than the depth of the inner wall of the clamping slot 12 .

[0027] Working principle: When using the present injection needle, the operator can first sleeve the fixing ring 62 on the injection port of an analytical device such as a liquid chromatograph, and then the operator can press the syringe body 1 downward. At this time, with the cooperation of the sleeve ring 3 and the vertical plate 4, the syringe body 1 drives the needle tube body 2 to steadily descend, and the needle tube body 2 passes through the guide cylinder 5 to enter the injection port of a device such as a liquid chromatograph. At the same time, the operator rotates the syringe body 1, and the extension plate 71 rotates accordingly and contacts the top of the inner wall of the through groove 14, the top of the slide bar 72 contacts the top of the inner wall of the groove 11, the tension spring 73 is stretched under force, the card plate 9 is used in conjunction with the card groove 12, the slide bar 72 is used in conjunction with the groove 11, and The extension plate 71 and the through groove 14 can be used together to limit the height of the syringe body 1. Thereafter, the operator presses down the piston rod on the top of the syringe body 1 to push the sample to be tested inside the syringe body 1 into the interior of the liquid chromatograph through the needle tube body 2, and pauses for an appropriate time so that the sample can better enter the interior of the liquid chromatograph for subsequent testing. Finally, the operator rotates the syringe body 1 in the opposite direction to raise the height of the syringe body 1 under the action of the elastic force of the tension spring 73, so that the needle tube body 2 can be quickly drawn out from the interior of the injection port. The injection needle can also protect the needle tube body 2 when the injection needle is idle to reduce the possibility of accidental bending of the needle tube body 2.

[0028] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A stable injection needle, comprising a syringe body (1), a needle tube body (2) mounted at the bottom of the syringe body (1), and a piston rod mounted at the top of the syringe body (1), characterized in that: Also includes: A collar (3) movably sleeved on the surface of the syringe body (1), the bottom of the collar (3) being fixedly connected to a vertical plate (4), the bottom of the vertical plate (4) being fixedly connected to a guide cylinder (5), the surface of the syringe body (2) being in contact with the inner wall of the guide cylinder (5), and a fixing mechanism (6) being installed on the surface of the guide cylinder (5); A limiting mechanism (7) is mounted on the surface of the syringe body (1), the surface of the limiting mechanism (7) is provided with a disc (8), the surface of the disc (8) is fixedly connected with a clamping plate (9), the top of the collar (3) is provided with a slide groove (10), the surface of the vertical plate (4) is provided with a groove (13), and the bottom of the inner wall of the groove (13) is provided with a through groove (14).

2. The injection needle with stable injection according to claim 1, characterized in that: A clamping groove (12) is provided above the surface of the vertical plate (4), and the surface of the clamping plate (9) is in contact with the inner wall of the clamping groove (12).

3. The injection needle with stable injection according to claim 1, characterized in that: The fixing mechanism (6) comprises a connecting rod (61) having one end fixedly connected to the surface of the guide cylinder (5) and a fixing ring (62) fixedly connected to the bottom of the other end of the connecting rod (61), wherein there are a plurality of connecting rods (61), and the inner surface of the fixing ring (62) is provided with a protruding structure.

4. The injection needle with stable injection according to claim 1, characterized in that: The limiting mechanism (7) comprises an extension plate (71) fixedly connected to the surface of the syringe body (1), a slide rod (72) fixedly connected to the top of the extension plate (71), and a tension spring (73) sleeved on the surface of the slide rod (72), the two ends of the tension spring (73) are respectively fixedly connected to the top of the extension plate (71) and the bottom of the disc (8), the surface of the slide rod (72) is in contact with the inner wall of the slide groove (10), the slide rod (72) slides through the disc (8), and the surface of the extension plate (71) is in contact with the inner walls of the slot (13) and the through slot (14).

5. The injection needle with stable injection according to claim 4, characterized in that: A groove (11) is provided at the bottom of the collar (3), the slide groove (10) is connected to the groove (11), and the top of the slide rod (72) is in contact with the top of the inner wall of the groove (11).

6. The injection needle with stable injection according to claim 2, characterized in that: The shape of the longitudinal section of the clamping plate (9) is L-shaped, and the length of the clamping plate (9) is greater than the depth of the inner wall of the clamping slot (12).

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