A kind of exhaust blood collection needle

Abstract

The present invention discloses an exhaust blood collection needle, which belongs to the technical field of medical clinical consumables, and includes a syringe, a thick ventilation duct, a thin ventilation duct, a blood collection control device and a needle core, which are arranged in sequence from the outside to the inside. The blood collection control device includes a transverse limiting component, a directional locking component and a positioning bearing component. The transverse limiting component is arranged on the inner wall of the positioning bearing component and is engaged with the needle core. The positioning locking component is arranged in the lower half of the positioning bearing component. In the locked state, the positioning locking component locks the positioning bearing component and the needle core into shape. The automatic exhaust syringe 20 of the present invention fills this gap and meets the needs of clinical and scientific research laboratories, etc. Moreover, because its components are all plastic parts and the slightly expensive semi-permeable membrane material is used in small amounts, the production cost is low, which is conducive to popularization and promotion under the current large market demand.

Description

Technical Field

[0001] The invention relates to the technical field of medical clinical consumables, in particular to an exhaust blood collection needle. Background Art

[0002] In actual clinical or laboratory work, empty needles are widely used, and a common problem is that air accidentally enters during blood or fluid drawing, affecting test results or drug quality. Currently, there is no affordable empty needle that can completely solve the problem of gas mixing during fluid drawing.

[0003] Therefore, it is necessary to design a low-cost empty needle that can be automatically deflated to fill the gap in the field of clinical and scientific research consumables. Summary of the invention

[0004] The purpose of the present invention is to provide an exhaust blood collection needle to solve the problems of the prior art.

[0005] The present invention provides an exhaust blood collection needle, comprising a syringe, a thick ventilation duct, a thin ventilation duct, a blood collection control device and a needle core which are arranged in sequence from the outside to the inside, the thick ventilation duct and the thin ventilation duct are both arranged on the needle core at intervals, the blood collection control device is arranged close to the inner wall of the syringe, the needle core is arranged in the syringe and can move in the vertical direction, the blood collection control device comprises a transverse limiting component, a directional locking component and a positioning bearing component, the transverse limiting component is arranged on the inner side wall of the positioning bearing component and is engaged with the needle core, the positioning locking component is arranged on the lower half of the positioning bearing component, and in the locked state, the positioning locking component locks both the positioning bearing component and the needle core into shape.

[0006] Furthermore, the needle core includes a blood collector end cover, an integrally formed first pull-out column and a second pull-out column, the blood collector end cover, the first pull-out column and the second pull-out column are coaxially arranged from top to bottom in the vertical direction, the outer circumferential wall of the first pull-out column is provided with a plurality of first fine teeth equally spaced along the vertical direction, the bottom of the blood collector end cover is provided with a rectangular groove passing through its circumferential wall, a side pull-out air valve is provided in the rectangular groove, and the side pull-out air valve can move in the rectangular groove along the horizontal direction, the first pull-out column and the second pull-out column are both provided with a through hole passing through the two along the axial direction, and the through hole is connected to the rectangular groove.

[0007] Furthermore, the thin ventilation pipe includes a coaxially arranged plugging pipe and a conical semipermeable membrane plugging head, the conical semipermeable membrane plugging head is arranged at the bottom of the plugging pipe, and a fixed distance is left between the conical semipermeable membrane plugging head and the inner circumferential wall of the thick ventilation pipe.

[0008] Furthermore, the positioning bearing component includes two symmetrically arranged columns and a bearing piston, both side walls of each column are arc-shaped structures, each bearing piston is fixedly connected to the bottom of the column, each bearing piston is arranged between the rough ventilation duct and the blocking pipe, each column is a structure with a large top and a small bottom, and the upper half of the inner side wall of each column is provided with a plurality of second fine teeth corresponding to a plurality of first fine teeth.

[0009] Furthermore, the transverse limiting components include two with the same structure, each of the transverse limiting components includes a support plate and two spring sheet bins, the two spring sheet bins are arranged between the first pulling column and the blocking pipe, and the column bar is provided with a storage space for accommodating the support plate and the two spring sheet bins, the support plate is arranged between the two spring sheet bins, and in the working state, each of the spring sheet bins is in contact with the support plate.

[0010] Furthermore, the directional locking component includes two symmetrically arranged locking buckles, and the bottom of each column is provided with a positioning groove for inserting the locking buckle. The outer circumferential wall of the pipe blocking is provided with two insertion grooves corresponding to the two locking buckles one by one. In the locked state, the locking buckle is inserted into the insertion groove.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] The automatic exhaust needle fills this gap and meets the needs of clinical and scientific research laboratories, etc. Moreover, because its components are all plastic parts and the slightly more expensive semi-permeable membrane material is used in very small amounts, the production cost is low. Under the current large market demand, it is conducive to popularization and promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0015] Figure 2 is a cross-sectional view of the present invention;

[0016] Figure 3 for Figure 2 The enlarged schematic diagram of point B in the middle;

[0017] Figure 4 It is a schematic diagram of the local three-dimensional structure of the present invention Figure 1 ;

[0018] Figure 5 It is a schematic diagram of the local three-dimensional structure of the present invention Figure 2 .

[0019] Figure numerals: coarse ventilation duct 1, blood sampling control device 2, thin ventilation duct 3, needle core 4, blood collector end cover 5, first pull-out column 6, second pull-out column 7, first fine teeth 8, rectangular groove 9, side pull-out air valve 10, through hole 11, plugging tube 12, conical semipermeable membrane plug 13, column 14, load-bearing piston 15, second fine teeth 16, abutment plate 17, spring sheet magazine 18, locking buckle 19, syringe 20. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0022] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Combine the following Figures 1 to 5As shown, an embodiment of the present invention provides a syringe 20, a blood sampling control device 2, and a needle core 4 which are arranged in sequence from the outside to the inside, the thick ventilation duct 1 and the thin ventilation duct 3 are both arranged on the needle core at intervals, the blood sampling control device 2 is arranged close to the inner wall of the syringe 20, the needle core 4 is arranged in the syringe 20 and can move along the vertical direction, the blood sampling control device 2 includes a transverse limiting component, a directional locking component and a positioning bearing component, the transverse limiting component is arranged on the inner side wall of the positioning bearing component and is engaged with the needle core 4, the positioning locking component is arranged in the lower half of the positioning bearing component, and in the locked state, the positioning locking component locks both the positioning bearing component and the needle core 4 into shape.

[0026] The needle core 4 includes a blood collector end cover 5, an integrally formed first pull-out column 6 and a second pull-out column 7, the blood collector end cover 5, the first pull-out column 6 and the second pull-out column 7 are coaxially arranged from top to bottom in the vertical direction, the outer circumferential wall of the first pull-out column 6 is provided with a plurality of first fine teeth 8 arranged at equal intervals in the vertical direction, the bottom of the blood collector end cover 5 is provided with a rectangular groove 9 penetrating its circumferential wall, the rectangular groove 9 is provided with a side pull-out air valve 10, the side pull-out air valve 10 can move in the rectangular groove 9 in the horizontal direction, the first pull-out column 6 and the second pull-out column 7 are both provided with a through hole 11 penetrating the two along the axial direction, the through hole 11 is connected to the rectangular groove 9, and in the assembled state, the side pull-out air valve 10 is plugged into the rectangular groove 9, and the coarse ventilation pipe 1 and the thin ventilation pipe 3 are respectively connected to the side The pull-out air valve 10 is blocked and cooperated. When withdrawing liquid, the side pull-out air valve 10 on the push-pull plate at the rear of the syringe 20 is pushed to the state of blocking the thick vent pipe, so that the thin vent pipe is opened, so that a slight negative pressure is maintained in the cavity of the blocking tube 12 during the process of withdrawing the tube core, so that only a narrow and long annular channel is always formed between the conical blocking tube 12 and the conical tube wall of the syringe 20 head. If there is still gas entering, the gas will be sucked into the cavity of the blocking tube 12 by the negative pressure in the cavity of the blocking tube 12; when it is necessary to vent or push out the liquid in the syringe 20, the side pull-out air valve 10 on the push plate at the rear of the syringe 20 is pushed to open the thick vent pipe. At this time, the negative pressure in the cavity of the blocking tube 12 disappears, and the blocking tube 12 has been pushed to the state of blocking the entrance of the syringe 20 under the action of the spring sheet. Directly pushing the tube core can discharge the air in the cavity of the blocking tube 12, and then the tube core is reset to facilitate drawing out the liquid again. If the latch on the locking buckle 19 of the needle tail is inserted to lift the entire blocking tube 12 again, the liquid in the cavity of the syringe 20 can be pushed out through the inlet of the syringe 20 when the needle core 4 is pushed.

[0027] The thin ventilation pipe 3 includes a coaxially arranged blocking tube 12 and a conical semipermeable membrane plug 13. The conical semipermeable membrane plug 13 is arranged at the bottom of the blocking tube 12. The conical semipermeable membrane plug 13 is at a fixed distance from the inner circumferential wall of the thick ventilation pipe 1. The conical semipermeable membrane plug 13 is at the inlet of the syringe 20, that is, the front end of the blocking tube 12 is designed with a conical semipermeable membrane. Due to the withdrawal of the blood collector end cap 5, the first pull-out column 6 and the second pull-out column 7 in the blocking tube 12, negative pressure is formed in the blocking tube 12. When air enters the inlet of the syringe 20, the conical semipermeable membrane plug 13 is used to pass gas, so that the gas is smoothly drawn into the lumen of the blocking tube 12, and the negative pressure of the blocking tube 12 is destroyed. The conical semipermeable membrane plug 13 bulges outward to block the inner wall of the syringe 20, and liquid cannot enter.

[0028] If liquid enters the inlet of the syringe 20, since the conical semipermeable membrane plug 13 cannot allow the liquid to pass through, a pressure difference pointing to the withdrawal direction will be formed on both sides of the conical semipermeable membrane plug 13 during the process of withdrawing the tube core, causing the conical semipermeable membrane plug 13 to move together with the plugging tube 12 toward the tail end of the syringe 20, making the conical semipermeable membrane plug 13 concave, and forming a gap between the conical semipermeable membrane plug 13 and the inner wall of the syringe 20. At this time, the liquid can enter the cavity of the syringe 20 outside the plugging tube 12.

[0029] The positioning bearing component includes two symmetrically arranged columns 14 and a bearing piston 15. The two side walls of each column 14 are arc-shaped structures. The bearing pistons 15 are fixedly connected to the bottom of the column 14. The bearing pistons 15 are arranged between the rough ventilation pipe 1 and the blocking pipe 12. The bearing pistons 15 are of an annular structure. Each column 14 is a structure with a large upper part and a small lower part. A plurality of second fine teeth 16 corresponding to a plurality of first fine teeth 8 are provided on the upper half of the inner wall of each column 14.

[0030] The transverse limiting components include two with the same structure, each of the transverse limiting components includes a stopper plate 17 and two spring sheet bins 18, the two spring sheet bins 18 are arranged between the first pulling column 6 and the blocking pipe 12, the column bar 14 is provided with a storage space for accommodating the stopper plate 17 and the two spring sheet bins 18, the stopper plate 17 is arranged between the two spring sheet bins 18, and in the working state, each of the spring sheet bins 18 is in contact with the stopper plate 17.

[0031] The directional locking component includes two symmetrically arranged locking buckles 19. The bottom of each column 14 is provided with a positioning groove for inserting the locking buckle 19. The outer circumferential wall of the pipe blocking 12 is provided with two insertion grooves corresponding to the two locking buckles 19. In the locked state, the locking buckle 19 is inserted into the insertion groove.

[0032] The needle core 4, the blocking tube 12, and the bearing piston 15 are a three-way linkage structure. The tail of the blocking tube 12 has push rods on opposite sides inserted into the spring sheet compartment 18 at the tail of each syringe 20. When the blocking tube 12 moves toward the tail, the spring sheet can be bent and deformed, so that the pull rod connected to the middle of the spring sheet pulls the column 14 connected to the piston of the outer syringe 20 cavity toward the needle core 4. The fine teeth on the column 14 engage with the fine teeth on the needle core 4, so that the needle core 4 and the piston of the outer syringe 20 cavity are linked. On the contrary, as long as the blocking tube 12 does not move toward the tail of the syringe 20, the needle core 4 will be disconnected from the piston of the outer syringe 20, and only the needle core 4 moves alone. The middle of the spring sheet in the spring compartment is connected to a pull rod, and every two pull rods correspond to the abutment plate 17 on the column 14 of the piston of the outer syringe 20 on one side.

[0033] Instructions for use: When pumping liquid, adjust the side-pull air valve 10 to a blocked state of the coarse vent hole and open the fine vent tube, so that air can be automatically exhausted during the pumping process; when exhausting air, adjust the side-pull air valve 10 to an open state of the coarse vent hole, and directly push the needle core 4 to exhaust air; when discharging liquid, adjust the side-pull air valve 10 to an open state of the coarse vent hole, and insert the two locking buckles 19 at the same time to keep the fine vent tube 3 in a closed state, and directly push the needle core 4 to discharge the liquid.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An exhaust blood collection needle, characterized in that: The invention comprises a syringe (20), a blood sampling control device (2), a thick ventilation duct (1), a thin ventilation duct (3) and a needle core (4) which are arranged in sequence from the outside to the inside, the blood sampling control device (2) being arranged close to the inner wall of the syringe (20), the thick ventilation duct (1) and the thin ventilation duct (3) being arranged in the needle core (4) at intervals, the thin ventilation duct (3) being movably matched with the blood sampling control device (2), the needle core (4) being arranged in the syringe (20) and being movable in a vertical direction, the blood sampling control device (2) comprising a transverse limiting component, a directional locking component and a positioning bearing component, the transverse limiting component being arranged on the inner side wall of the positioning bearing component and being engaged with the needle core (4), the positioning locking component being arranged at the lower half of the positioning bearing component, and in a locked state, the positioning locking component locks the positioning bearing component and the needle core (4) into a locked state; The needle core (4) comprises a blood collector end cover (5), an integrally formed first pull-out column (6) and a second pull-out column (7); the blood collector end cover (5), the first pull-out column (6) and the second pull-out column (7) are coaxially arranged from top to bottom in the vertical direction; a plurality of first fine teeth (8) are arranged at equal intervals in the vertical direction on the outer circumferential wall of the first pull-out column (6); a rectangular groove (9) penetrating the circumferential wall of the blood collector end cover (5) is provided at the bottom; a side pull-out air valve (10) is provided in the rectangular groove (9); the side pull-out air valve (10) can move in the rectangular groove (9) in the horizontal direction; the first pull-out column (6) and the second pull-out column (7) are both provided with a through hole (11) penetrating the two along the axial direction; the through hole (11) is connected to the rectangular groove (9); The thin ventilation pipe (3) comprises a plugging pipe (12) and a conical semipermeable membrane plug (13) which are coaxially arranged, wherein the conical semipermeable membrane plug (13) is arranged at the bottom of the plugging pipe (12), and a fixed distance is left between the conical semipermeable membrane plug (13) and the inner circumferential wall of the thick ventilation pipe (1); The positioning bearing component comprises two symmetrically arranged columns (14) and a bearing piston (15), both side walls of each column (14) are arc-shaped structures, the bearing piston (15) is fixedly connected to the bottom of the column (14), the bearing piston (15) is arranged between the coarse ventilation pipe (1) and the blocking pipe (12), each column (14) is a structure with a large upper part and a small lower part, and the upper half of the inner side wall of each column (14) is provided with a plurality of second fine teeth (16) corresponding to the plurality of first fine teeth (8) one by one; The transverse limiting components include two components with the same structure, each of the transverse limiting components includes a stopper plate (17) and two spring sheet bins (18), the two spring sheet bins (18) are arranged between the first pull-out column (6) and the plugging pipe (12), the column bar (14) is provided with a storage space for accommodating the stopper plate (17) and the two spring sheet bins (18), the stopper plate (17) is arranged between the two spring sheet bins (18), and in a working state, each of the spring sheet bins (18) is in contact with the stopper plate (17); The directional locking component comprises two symmetrically arranged locking buckles (19), the bottom of each column (14) is provided with a positioning groove for inserting the locking buckle (19), and the outer circumferential wall of the pipe plug (12) is provided with two insertion grooves corresponding to the two locking buckles (19) one by one, and in the locked state, the locking buckle (19) is inserted into the insertion groove.

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