CN210186180U

CN210186180U - Disposable micro high-precision safety syringe

Info

Publication number: CN210186180U
Application number: CN201822032908.7U
Authority: CN
Inventors: Lin Wang; 王琳
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-12-05
Filing date: 2018-12-05
Publication date: 2020-03-27
Anticipated expiration: 2028-12-05

Abstract

The utility model relates to a trace high-precision syringe, a disposable trace high-precision safety syringe, which comprises a push rod, a rubber plug and a cylinder body, wherein the push rod is matched with the rubber plug and is arranged at the upper end of the cylinder body; the push rod drives the needle seat to rotate and loosen, and simultaneously pulls the needle body into the cylinder body, and the bent needle body is locked in the cylinder body. According to the technical scheme of the utility model, the needle body is fixed on the needle seat by arranging the needle seat, the needle seat is matched with the rubber plug, after the injection is finished, the needle body follows the needle seat, the rubber plug is driven by the push rod to be pulled back into the barrel body, and the needle body is not coaxial with the barrel body, so that the pull rod is further pushed to ensure that the needle body is bent and destroyed in the barrel body to solve the problem of avoiding secondary utilization, the design is ingenious, and the function is powerful; meanwhile, the matching of the rubber plug and the needle seat achieves the purpose of exhausting the air in the cylinder body.

Description

Disposable micro high-precision safety syringe

Technical Field

The utility model relates to a medical syringe field especially relates to trace high accuracy syringe.

Background

Injection is an indispensable means of medical procedures, and syringes are the necessary tools to perform injections. Common general classifications of syringes include the following four types:

1. syringe for muscle: the common specification is 1.0 ml; 2.5 ml; 5.0 ml; 1.0ml, etc.

2. Syringe for intravenous use: the common specification is 5.0 ml; 10 ml; 25 ml; 50 ml; 100ml, etc.

3. Micro high-precision injector: the common specification is 0.3 ml; 0.5ml, 1ml, etc.

4. And (3) the other: a syringe for sampling by puncturing.

The safety of the 4 products in the application range is analyzed as follows:

1. syringe for muscle: 1ml and 2.5ml are sold in the market with local brand safety syringes.

2. Syringe for intravenous use: because the needle can be connected with a scalp needle (intravenous injection tube for intravenous injection), no safe injector specially used for intravenous injection is sold at present.

3. Micro high-precision injector: the micro high-precision injector is widely applied to various vaccine injections, insulin injections, heart first-aid injections, hypertension first-aid injections, human body temperature loss first-aid injections, allergen tests and the like, and has very wide application range and very large demand. However, to meet the requirement of injection precision, the structure must adopt a slender cylinder body design, and the inner diameters of the inner holes of the cylinder body are respectively 0.3ml and less than 3 mm; 0.5ml of inner diameter <3.8 mm; 1.0ml of inner diameter <5.4 mm; the accuracy requirement can be met.

Because the structure is extremely tiny, a safety syringe in the field of micro high-precision syringes does not exist, the prior structure is shown in figure 25, the structure comprises a push rod 1, a rubber plug 2, a barrel body 3, a needle body 4, a needle protecting cover 5 and the like, the needle body 4 is adhered in a front end hole of the barrel body 3, and the needle protecting cover 5 is covered; the push rod 1 is combined with the rubber plug 2, and finally the push rod 1 combined with the rubber plug 2 is assembled with the cylinder body 3.

In the related field, for example, chinese patent CN201510867304.2, application date 2015, 12, month 1 and publication date 2016, 2, month 3, the invention named safety syringe comprises a syringe, a piston and an injection needle, wherein one end of the syringe is provided with an injection end, and the needle is bent in the syringe in a manner that the central axis of the syringe is not coaxial with the injection end to avoid secondary utilization, so as to solve the problem of safety injection.

Disclosure of Invention

The utility model provides a disposable micro high-precision safety syringe which avoids secondary utilization aiming at the defects of safety defects in the prior art.

In order to solve the technical problem, the utility model discloses a following technical scheme can solve:

a disposable micro high-precision safety syringe comprises a push rod, a rubber plug and a barrel body, wherein the push rod is matched with the rubber plug and is placed in the barrel body from the upper end of the barrel body; the push rod drives the needle seat to rotate and loosen, and simultaneously pulls the needle body into the cylinder body, and the bent needle body is locked in the cylinder body. The needle body is drawn into the barrel body through the ingenious design, so that the needle body is destroyed in the barrel body, and the purpose of avoiding secondary use is achieved.

Preferably, the rubber plug is made of an elastomer material, and the center of the rubber plug is a hollow through round hole; the bottom surface of the rubber plug forms a first end surface; the push rod passes through the hollow through round hole of the rubber plug and is matched with the upper part of the needle seat; the center of the cylinder body is a hollow hole, and the lower end of the cylinder body is a hollow inner hole. The elastic material of the rubber plug is pulled back to ensure that the needle body can keep a state of non-coaxial with the cylinder body, thereby being beneficial to bending.

Preferably, a hollow cylinder is arranged above the outer side of the needle seat, a protruding cylinder is arranged on the outer circumference of the hollow cylinder, and the protruding cylinder is in extrusion contact with the first end face of the rubber plug; the bottom of the lower end of the push rod is a hemispherical end point, and four first convex ribs are uniformly distributed on the hemispherical end point; a central hollow hole is formed above the needle base, a small-diameter round hole is formed above the central hollow hole, and the diameter of the small-diameter round hole is smaller than the distance between the axial lines of the opposite sides of the four first convex ribs at the hemispherical end points of the push rod; four second convex ribs parallel to the axis are uniformly distributed on the inner wall of the central hollow hole, and the first convex ribs at the hemispherical end points are matched with the second convex ribs on the inner wall of the central hollow hole.

Preferably, the outer side of the needle seat is positioned below the hollow cylinder, and an annular flange and 180 DEG protrusion cylinders protruding from two sides of the needle seat are sequentially arranged; the middle section of the needle seat positioning sleeve is provided with a protruding mountain structure with an inner wall corresponding to 180 degrees, a peak top is formed on the protruding mountain structure, a 45 degree slope is formed on one side, a concave opening with a vertical axis is formed at the bottom of the slope and the peak top, the peak top is used for supporting an annular flange of the needle seat, the concave opening is used for limiting protruding cylinders on two sides of the needle seat in a protruding mode, and the 45 degree slope is used for enabling the needle seat to move towards the inside of the cylinder body along the motion track of the protruding cylinders when the needle seat rotates and loosens.

Preferably, an annular groove is arranged between the hollow cylinder and the annular flange on the outer side of the needle seat, and a sealing ring is sleeved on the annular groove; the sealing ring is made of an elastomer material and is in an annular structure with a circular line diameter, and the sealing ring is in extrusion contact with the inner wall of the hollow inner hole of the cylinder body.

Preferably, the lower end of the push rod is sequentially provided with an annular rhombic protruding structure and a tail end cylinder, the tail end cylinder is provided with a right-angle annular protruding rib, and the hemispherical end point is positioned at the bottom end of the tail end cylinder; the hollow penetrating circular hole inner wall of the rubber plug is in extrusion fit with the right-angle annular convex rib of the push rod; an annular rhombic concave structure which is matched and positioned with the annular rhombic convex structure of the push rod is arranged at one end of the hollow through round hole; the outer side of the end is provided with an annular flange, the outer side of the other end is provided with a lip-like annular structure, and the bottom end is a first end surface; the annular flange and the lip-like annular structure of the rubber plug are in extrusion fit with the inner wall of the hollow hole of the cylinder body. Annular rhombus protruding structure combines with annular rhombus sunk structure to be used for the location installation plug, and the protruding muscle of right angle shape annular is used for running through the round hole to the plug cavity and opens sealed effect, and the hemisphere extreme point is used for the injection to accomplish and carries out the rotatory pine of needle file and move back and pull back and get into inside the stack shell.

Preferably, the push rod is provided with a circular flange; a protruding triangular ring structure with a reduced diameter is formed at an inlet at the upper end of the cylinder body, and the push rod is matched with the protruding triangular ring structure through a circular flange. The circular flange is used for preventing the rubber plug from moving, and is matched with the convex triangular annular structure of the cylinder body to prevent the rubber plug from being separated from the cylinder body when the needle seat and the needle body are withdrawn.

Preferably, the periphery of the lower end of the cylinder body is provided with a first annular plane and a first annular convex rib; the upper section of the needle seat positioning sleeve is a cylinder body positioning hole, a second annular plane, a second annular convex rib and an inner hole end face are sequentially arranged on the cylinder body positioning hole from top to bottom, and the first annular plane, the first annular convex rib and the conical hollow inner hole are respectively matched with the second annular plane, the second annular convex rib and the inner hole end face.

Preferably, the lower section of the needle base positioning sleeve is a needle base center plug positioning hole, a needle base center plug is fixed below the needle base positioning sleeve through the needle base center plug positioning hole, and the center of the needle base center plug is an axis positioning hole; the needle body penetrates out of the needle seat central plug through the axis positioning hole of the needle seat central plug.

Preferably, the needle seat center plug positioning hole is sequentially provided with a third annular convex rib, a third annular plane and a third end surface positioned at the bottom end from top to bottom; a fourth annular convex rib, a fourth annular plane and a positioning end face are sequentially arranged outside the central plug of the needle base; the third annular convex rib and the third annular plane are respectively matched with the fourth annular convex rib and the fourth annular plane, and the third end face is in contact fit with the positioning end face.

Preferably, the upper end of the push rod is provided with a square handle. The design is square, except for the application of medicament extraction and injection operation, the convenience of rotating, loosening and pulling back the operation needle base after injection is finished is increased.

Preferably, the other end of the needle body penetrates out of the central plug of the needle base and is sleeved with a needle protecting cover; the upper end of the needle seat positioning sleeve is a flange end, the flange end and the lower outer side of the needle seat positioning sleeve form a second end surface, and four third convex ribs parallel to the central axis are arranged on the circumference of the lower outer side of the needle seat positioning sleeve; the center of the needle protecting cover is a central circular cavity, and the top end of the needle protecting cover is a fifth end surface; the inner hole wall of the central circular cavity is matched with the third convex rib of the needle seat positioning sleeve, and the fifth end surface is matched with the second end surface of the needle seat positioning sleeve. The needle protecting cover is additionally arranged to further protect the safety of the needle body.

Preferably, a fifth annular convex rib is formed at the upper part of the central circular cavity of the needle protecting cover, a smooth small convex point is arranged on the third convex rib of the needle base positioning sleeve, and the small convex point is matched with the fifth annular convex rib.

Preferably, the needle seat center plug top end forms a fourth end surface.

According to the technical scheme of the utility model, the needle body is fixed on the needle seat by arranging the needle seat, the needle seat is matched with the rubber plug, after the injection is finished, the needle body follows the needle seat, the rubber plug is driven by the push rod to be pulled back into the cylinder body, the needle body and the cylinder body are shifted by using the elastic material of the rubber plug, namely, the needle body and the cylinder body are not coaxial, so that the pull rod is pushed again to ensure that the needle body is bent and destroyed in the cylinder body to solve the problem of avoiding secondary utilization, the design is ingenious; meanwhile, the matching of the rubber plug and the needle seat achieves the purpose of exhausting the air in the cylinder body.

Drawings

FIG. 1 is a schematic view of the appearance of the present invention;

FIG. 2 is an exploded view of the components of FIG. 1;

FIG. 3 is a schematic structural view of the push rod 1 of the assembly of FIG. 2;

figure 4 is a schematic structural view of the assembly plug 2 of figure 2;

FIG. 5 is a schematic structural view of the cartridge body 3 of the assembly of FIG. 2;

FIG. 6 is a schematic view of the seal ring 4 of the assembly of FIG. 2;

fig. 7 is a schematic structural view of the hub 5 of the assembly of fig. 2;

fig. 8 is a schematic structural view of the hub positioning sleeve 6 of the assembly of fig. 2;

fig. 9 is a schematic structural view of the central plug 7 of the hub of the assembly of fig. 2;

FIG. 10 is a schematic view of the needle 8 of the set of FIG. 2;

FIG. 11 is a diagrammatic view of portions of the needle protective cover 9 of the assembly of FIG. 2;

fig. 12 is a schematic structural view illustrating the assembly of the push rod 1 and the rubber plug 2 in fig. 2;

fig. 13 is a schematic structural view of the push rod 1 and the rubber plug 2 assembled in fig. 2 and the barrel 3;

fig. 14 is a structural schematic view of the assembly of the sealing ring 4 and the needle seat 5 in fig. 2;

fig. 15 is a structural schematic view of the needle holder positioning sleeve 6 and the needle holder central plug 7 in fig. 2 in an assembled manner;

fig. 16 is a structural schematic view of the assembly of the sealing ring 4, the needle seat 5, the needle seat positioning sleeve 6 and the needle seat central plug 7 in fig. 2;

FIG. 17 is a schematic view of the needle 8, the sealing ring 4, the needle seat 5, the needle seat positioning sleeve 6 and the needle seat central plug 7 which are combined to form an integral structure and adhere to the needle 8 to form an integral structure in FIG. 2;

FIG. 18 is a schematic view of the components of the structure of FIG. 2, which are assembled into an integral structure after the sealing ring 4, the needle seat 5, the needle seat positioning sleeve 6, the needle seat central plug 7, the needle body 8 and the needle protecting cover 9 are assembled;

fig. 19 is a schematic structural view of the structural assembly of the present invention;

FIG. 20 is a schematic diagram of the operation of the various components of the process flow-performing the purge step prior to the withdrawal of the medicament;

figure 21 is a schematic diagram of the operation of the components for performing the extraction of the medicament using the operational flow;

FIG. 22 is a schematic view of the operation of the components of the needle hub being rotationally loosened using the operational flow-injection complete;

FIG. 23 is a schematic view of the operation flow of executing the push rod to pull the needle of the needle holder back into the components of the barrel;

FIG. 24 is a schematic diagram of the components for needle destruction using the procedure of pushing the push rod forward;

FIG. 25 is a schematic diagram of the appearance and structure of a conventional micro high-precision syringe on the market;

FIG. 26 is an enlarged view of portion A of FIG. 12;

FIG. 27 is an enlarged view of portion B of FIG. 19;

FIG. 28 is an enlarged view of section C of FIG. 20;

FIG. 29 is an enlarged view of section D of FIG. 21;

FIG. 30 is an enlarged view of section E of FIG. 21;

FIG. 31 is an enlarged view of section F of FIG. 22;

FIG. 32 is an enlarged view of portion G of FIG. 23;

fig. 33 is an enlarged view of a portion H of fig. 24.

The names of the parts indicated by the numerical references in the drawings are as follows: 1-push rod, 2-rubber plug, 3-cylinder, 4-sealing ring, 5-needle seat, 6-needle seat positioning sleeve, 7-needle seat central plug, 8-needle body, 9-needle protecting cover;

1-1: square handle, 1-2: circular flange, 1-3: annular rhombus convex structure, 1-4: right-angle annular convex rib, 1-5: end cylinder, 1-51: hemispherical end point, 1-52: a first rib;

2-1: hollow through round hole, 2-2: annular flange, 2-3: lip-like annular structure, 2-4: an annular diamond-shaped recessed structure; 2-5: a first end face;

3-1: operating handle, 3-2: hollow hole, 3-3: convex triangular ring structure, 3-4: first annular plane, 3-5: first annular convex rib, 3-6: tapered hollow bore, 3-7: an inner hole oblique conical surface;

5-1: mounting hole, 5-2: convex cylinder, 5-3: annular flange, 5-4: annular groove, 5-5: hollow cylinder, 5-6: protruding cylinder, 5-7: 5-8 parts of second convex rib, 5-9 parts of small-diameter round hole: central hollow bore, 5-10: peripheral convex ribs;

6-3: third convex rib, 6-4: second end face, 6-5: barrel body positioning hole, 6-6: convex mountain structure, 6-7: a positioning hole is plugged in the center of the needle seat, 6-31: small bump, 6-51: second annular plane, 6-52: second annular bead, 6-53: bore inner end face, 6-61: crest, 6-62: 45 slope, 6-63: recess opening, 6-71: a third annular convex rib; 6-72: a third annular plane; 6-73: a third end face;

7-1: axis positioning hole, 7-2: locating end face, 7-3: fourth annular plane, 7-4: fourth annular convex rib, 7-5: a fourth end face; 8-1: a needle tip;

9-2: hollow round cavity, 9-3: inner bore wall, 9-4: fifth end face, 9-21: a fifth annular rib.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings 1 to 33 and the following detailed description:

example 1

The utility model contains 0.3ml of cover; 0.5ml and 1ml of micro high-precision full syringes with three specifications. The appearance structure of the utility model is schematically shown in figure 1.

The integral structure mainly comprises a push rod 1, a rubber plug 2, a cylinder body 3, a sealing ring 4, a needle seat 5, a needle seat positioning sleeve 6, a needle seat central plug 7, a needle body 8 and a needle protecting cover 9. The push rod 1 and the rubber plug 2 are combined and placed into the cylinder body 3 to form a combined body; the sealing ring 4 is sleeved into the needle seat 5 to be combined, and the needle seat positioning sleeve 6 is combined with the needle seat central plug 7 and then combined together; the needle body 8 is adhered to the needle base 5 and then sleeved with the needle protecting cover 9; the sealing ring 4, the needle seat 5, the needle seat positioning sleeve 6, the needle seat central plug 7, the needle body 8 and the needle protecting cover 9 form a whole, and then the whole structure is finally assembled and combined with the assembly of the push rod 1 and the cylinder body 3 of the rubber plug 2 to finish the whole framework. As shown in fig. 2.

The handle at the upper end of the push rod 1 is designed to be square, and is used for extracting and injecting the medicament, and the square handle 1-1 not only has the medicament extraction and injection operation purposes, but also increases the convenience of rotating, loosening and pulling back the operation needle base 5 after the injection is finished; the end point of the cross structure of the connecting rod forms a circular flange 1-2 which is used for preventing the rubber plug 2 from moving outwards and preventing the rubber plug from being separated from the cylinder body 3 when the rubber plug is used for withdrawing the needle base 5 and the needle body 8; the center of the circular flange 1-2 is connected with an annular diamond-shaped protruding structure 1-3 through a cylinder to be used for installing and positioning the rubber plug 2; the installation position of the cylindrical rubber plug 2 is provided with right-angle annular convex ribs 1-4 for sealing the hollow through round hole 2-1 of the rubber plug 2; the end point of the tail end cylinder 1-5 is a hemispherical end point 1-51, and four first convex ribs 1-52 are distributed along the hemispherical edge and used for performing rotary loosening and retraction of the needle seat 5 into the barrel body 3 after injection is completed. As shown in fig. 3.

The rubber plug 2 is made of elastomer material and is structurally provided with a hollow through round hole 2-1, and an annular rhombic concave structure 2-4 is arranged in the hollow through round hole 2-1 and is used for positioning in combination with an annular rhombic convex structure 1-3 of the push rod 1; a peripheral annular flange 2-2 and a lip-like annular structure 2-3 for pressing contact with the inner wall of the hollow bore 3-2 of the barrel 3 to form a seal after being combined with the barrel 3. As shown in fig. 4.

The two sides of the structure of the barrel body 3 are provided with operating handles 3-1, which are convenient for the extraction and injection operation of the medicament; a hollow hole 3-2 is formed in the center of the cylinder body and is used for placing the push rod 1 which finishes the installation of the rubber plug 2 for combination; the inner wall of the inlet side of the hollow hole 3-2 is designed to be a protruding triangular annular structure 3-3, the inner diameter is reduced, when the push rod 1 is pulled back, the circular flange 1-2 is stopped to be loosened, the needle seat 5 and the needle body 8 are prevented from being separated from the barrel body 3, and the safety protection effect is started; the other end of the cylinder body 3 is a conical hollow inner hole 3-6, the conical hollow inner hole 3-6 is provided with a needle seat 5, a hollow cylinder 5-5 and a sealing ring 4, and the inner wall of the conical hollow inner hole 3-6 is tightly pressed and contacted with the sealing ring 4 for opening and sealing; an inner hole oblique conical surface 3-7 is formed at the upper end of the conical hollow inner hole 3-6, and the inner hole oblique conical surface 3-7 is convenient for removing residual bubbles after the medicament is extracted; an annular convex rib 3-5 and a first annular plane 3-4 are arranged at the outer side close to the end point, and the first annular convex rib 3-5 is used for clamping a second annular convex rib 6-52 of a cylinder body positioning hole 6-5 of the needle seat positioning sleeve 6 when being combined with the needle seat positioning sleeve 6 so as to ensure that the second annular convex rib is fixed without looseness; and the first annular plane 3-4 is precisely combined with the second annular plane 6-51 of the needle seat positioning sleeve 6 to maintain the central axis to be consistent. As shown in fig. 5.

The sealing ring 4 is made of elastomer material and structurally has a circular structure with a circular line diameter, is sleeved into the annular groove 5-4 of the needle seat 5, and forms a squeezing contact sealing opening effect with the inner wall of the conical hollow inner hole 3-6 of the cylinder body 3 when the finished product is assembled. As shown in fig. 6.

The needle seat 5 is structurally provided with a hollow cylinder 5-5 on one side of the outer circumference; the annular groove 5-4 is used for assembling the sealing ring 4; the annular flange 5-3 is in contact with the peak 6-61 of the convex mountain mechanism 6-6 in the hollow hole of the needle seat positioning sleeve 6 after being assembled except for the positioning function of the sealing ring 4, the convex cylinders 5-2 at the two sides of the convex part enter the concave opening 6-63 of the mountain mechanism 6-6 for positioning after being assembled, the needle seat is limited by the peak 6-61 and the convex cylinder 5-2 positioned in the concave opening 6-63 for opening and limiting, and the needle seat 5 and the needle seat positioning sleeve 6 cannot be displaced, opened and fixed; four second convex ribs 5-7 parallel to the axis are arranged on the inner wall of the central hollow hole 5-9 and are used for combining with four first convex ribs 1-52 distributed on the edge of an upper hemispherical end point 1-51 of the push rod 1 to form staggered interference when injection is finished, and the push rod 1 is rotated to drive the needle seat 5 to rotate, loosen and retreat; the end point of the central hollow hole 5-9 forms a small-diameter round hole 5-8 which is used for the pull-back action after the rotary loosening and pulling action, so that the needle base 5 and the needle body 8 are pulled into the barrel body 3; the four peripheral convex ribs 5-10 parallel to the axis on the outer side are convenient for rotating the needle base during assembly to ensure that the convex cylinder 5-2 enters the concave opening 6-63 for positioning, and the axis positioning hole 7-1 penetrating through the central plug 7 of the needle base is kept consistent with the central axis; the circumference of the end of the hollow cylinder 5-5 is provided with a protruding cylinder 5-6, when the injection is finished, the rotating loosening and the pulling back of the needle body are carried out, the protruding cylinder is kept to be in tight extrusion contact with the end face of the rubber plug 2, when the needle body 8 is completely pulled back into the barrel body 3, the needle seat 5 is forced to deviate from the central axis by using the first protruding rib 1-52 of the hemispherical end point at the front end of the push rod as a fulcrum under the traction of the small-diameter round hole 5-8 under the elastic action of the rubber plug 2, so that the needle body 8 is beneficial to pushing the push rod 1 forward again to enable the needle point 8-1 to be propped against the fourth end face 7-5 of the central plug 7 of the needle seat, the needle body 8 is damaged and bent and locked in the barrel body 3 under the force, and any link ensures that. As shown in fig. 7.

The needle seat positioning sleeve 6 is provided with a through hollow hole in the center, one end of the needle seat positioning sleeve is used as a cylinder body positioning hole 6-5 for being combined with the cylinder body 3, the inner end surface 6-53 of the hole is used as a limiting effect when being combined with the cylinder body 3 and is contacted with the end surface of the conical hollow inner hole 3-6, the second annular convex rib 6-52 is used for clamping the first annular convex rib 3-5 of the cylinder body 3 when being combined with the cylinder body 3 so as to be fixed and not loosened, and the second annular plane 6-51 is precisely combined with the first annular plane 3-4 on the outer side of the cylinder body 3 so as to ensure the consistency of the. The other end of the needle base central plug is used as a needle base central plug positioning hole 6-7 combined with the needle base central plug 7, and when the needle base central plug is combined with the third annular convex rib 6-71, the fourth annular convex rib 7-4 on the periphery of the needle base central plug 7 is clamped and fixed without looseness; the third annular plane 6-72 is precisely combined with a fourth annular plane 7-3 at the periphery of the central plug 7 of the needle seat to ensure that the central axes are consistent; and the third end surface 6-73 of the positioning hole 6-7 of the central plug of the needle seat and the positioning end surface 7-2 of the central plug 7 of the needle seat are limited. A protruding mountain structure 6-6 with 180 degrees corresponding to the inner wall of the middle section of the through center hole, wherein the peak top 6-61 is arc-shaped, one side forms a 45 degree slope 6-62, and the other side forms a sunken opening 6-63 vertical to the axis at the corresponding bottom of the slope peak point; the peak 6-61 is used as a supporting needle seat 5, the annular flange 5-3 is used for positioning and limiting the concave opening 6-63 as a convex cylinder 5-2 at the two sides of the convex of the needle seat 5; the 45 degree slope 6-62 serves as a motion track function for guiding the protrusion cylinder 5-2 when the needle base 5 rotates and loosens, so that the needle base 5 moves towards the inner part of the barrel body 3. Four third convex ribs 6-3 parallel to the central axis are arranged on the circumference of the outer side, smooth small convex points 6-31 are respectively arranged on the third convex ribs 6-3, when the needle protecting cover 9 is closed, the small convex points 6-31 can be in clamping opening action with fifth annular convex ribs 9-21 on the inner wall of the needle protecting cover 9, so that the needle protecting cover is not easy to loosen; the third convex rib 6-3 keeps a proper gap with the inner hole wall 9-3 of the needle protecting cover 9, so that the needle protecting cover 9 cannot shake; the second end face 6-4 touches the fifth end face 9-4 of the needle protecting cover 9, and plays a role in limiting when the needle protecting cover 9 is closed; when the injection operation is finished and the needle seat is rotated and loosened, the finger of one hand rotates the square handle 1-1 of the push rod 1, the other finger holds the third convex rib 6-3, and the anti-rotation and anti-slip effects are achieved during the rotation operation. As shown in fig. 8.

The center of the structure of the needle base center plug 7 is provided with a through axis positioning hole 7-1 which plays a role in supporting four peripheral convex ribs 5-10 on the outer side of the needle base 5 on the central axis; when in combination, the fourth annular convex rib 7-4 on the outer side is clamped and positioned by the third annular convex rib 6-71 of the inner hole of the needle seat positioning sleeve 6, so that the needle seat positioning sleeve is stable and does not loosen; the fourth annular plane 7-3 and the third annular plane 6-72 are precisely combined to ensure the central axes to be consistent; the positioning end face 7-2 is contacted with the third end face 6-73 of the positioning hole 6-7 of the needle seat center plug to be used as a limiting effect; the fourth end surface 7-5 is used for propping against the needle point 8-1 when the needle body 8 is destroyed, so that the needle body 8 is forced to bend and destroy, the inside of the needle cylinder is locked without leakage, and the secondary needle stick infection accident is prevented. As shown in fig. 9.

The needle body 8 is a precise stainless steel hollow tube structure, the center of the needle body is provided with a through hollow hole, and one end of the needle body is ground into a needle point 8-1 with a sharp cutting edge for injecting and puncturing the skin of a human body. One end without cutting edge is coated with adhesive to be adhered and fixed with the needle body mounting hole 5-1 of the needle stand 5. As shown in fig. 10.

The needle protecting cover 9 structure center forms the hollow round cavity 9-2, is used for taking in the needle body 8 and opening the protective action to the needlepoint 8-1, the fifth annular protruding rib 9-21 of the inner wall will surpass the needle file locating sleeve 6 little bump 6-31 and open the position blocking action when closing the needle protecting cover, make the needle protecting cover difficult to loosen and take off; the inner hole wall 9-3 of the hollow round cavity 9-2 and the third convex rib 6-3 of the needle seat positioning sleeve 6 are close to the needle protecting cover to keep the needle protecting cover not to shake; and the fifth end surface 9-4 touches the second end surface 6-4 of the needle seat positioning sleeve 6 to serve as a limit function when the needle seat is closed. As shown in fig. 11.

The hollow through round hole 2-1 of the elastomer rubber plug 2 is sleeved in through the hemispherical end point 1-5 end of the push rod 1 until the hollow through round hole contacts the circular flange 1-2, the central perforated annular diamond-shaped concave structure 2-4 and the annular diamond-shaped convex structure 1-3 are combined to play a role in positioning, the function of preventing front and back displacement during operation is realized, and meanwhile, the right-angle annular convex rib 1-4 and the inner wall of the hollow through round hole 2-1 are mutually and tightly extruded to start the sealing function. Referring to the schematic view of each part after the push rod 1 and the rubber plug 2 are combined, as shown in fig. 12.

The assembled push rod 1 and the rubber plug 2 are pushed into the hollow hole 3-2 of the cylinder 3, so that the annular flange 2-2 and the lip-like annular structure 2-3 of the rubber plug 2 are tightly pressed with the inner wall of the hollow hole 3-2 to open the sealing function. Refer to the schematic view of each part of the push rod 1 and the rubber plug 2 assembled with the barrel 3, as shown in fig. 13.

The elastic body sealing ring 4 is assembled and sleeved into the annular groove 5-4 for installing the sealing ring of the needle seat 5 for positioning. Referring to the schematic view of the parts after the sealing ring 4 and the needle holder 5 are combined, it is shown in fig. 14.

The needle base center plug 7 is pressed into the needle base center plug positioning hole 6-7 of the needle base positioning sleeve 6 by the fourth end surface 7-5 side, the fourth annular convex rib 7-4 on the periphery of the needle base center plug 7 crosses the third annular convex rib 6-71 protruding in the needle base center plug positioning hole to be tightly clamped and positioned, meanwhile, the third annular plane 6-72 is contacted with the fourth annular plane 7-3 to ensure that the integral central axes are consistent, and at the moment, the positioning end surface 7-2 is tightly sealed and fixed with the third end surface 6-73. Referring to the schematic view of the parts of the hub positioning sleeve 6 combined with the hub central plug 7, fig. 15 shows.

The assembly of the finished sealing ring 4 and the needle base 5 is placed into the assembly of the finished needle base center plug 7 and the needle base positioning sleeve 6, the assembly is placed into the hole from the side of the cylinder body positioning hole 6-5, the protruding cylinder 5-2 extends along the inclined planes at the two sides of the protruding mountain structure 6-6 in the needle base center plug hole and slides into the valley bottom until the annular flange 5-3 contacts with the peak 6-61, the four peripheral convex ribs 5-10 of the needle base 5 exposed out of the needle base center plug 7 are rotated, so that the protruding cylinder 5-2 enters the positioning concave opening 6-63, the needle base 5 is limited by the peak 6-61 and the cylindrical positioning concave opening 6-63, the displacement starting and stabilizing effects cannot be realized, and meanwhile, the four peripheral convex ribs 5-10 are limited by the inner diameter of the axis positioning hole 7-1 and are stably positioned on the central. Referring to the schematic view of the parts of the integrated structure after the combination of the sealing ring 4, the needle seat 5, the needle seat positioning sleeve 6 and the needle seat central plug 7, fig. 16 shows.

The outside surface of the needle body at the other end of the needle body 8 away from the needle point 8-1 is evenly coated with an adhesive, and the needle body mounting hole 5-1 which is assembled into an integral structure by the sealing ring 4, the needle seat 5, the needle seat positioning sleeve 6 and the needle seat central plug 7 is placed in and positioned. Referring to the schematic view of the parts of the needle 8, the sealing ring 4, the needle seat 5, the needle seat positioning sleeve 6 and the needle seat central plug 7 which are combined into an integral structure, the needle 8 is bonded into an integral structure, as shown in fig. 17.

From the above, the assembly of the sealing ring 4, the needle seat 5, the needle seat positioning sleeve 6 and the needle seat central plug 7 and the adhesion of the needle body 8 into an integral structure are completed, the needle protecting cover 9 is sleeved on the needle point 8-1 until the fifth end surface 9-4 touches the second end surface 6-4, the fifth annular convex rib 9-21 on the inner side of the hollow circular cavity 9-2 of the needle protecting cover 9 is positioned beyond the small salient point 6-31 on the third annular convex rib 6-3 on the periphery of the needle seat positioning sleeve 6 parallel to the axis and is not easy to loose, and the inner wall 9-3 of the hollow circular cavity 9-2 and the third annular convex rib 6-3 parallel to the axis keep a little clearance at the center of the axis and cannot shake, so as to be combined into a group assembly. Referring to the schematic view of the parts of the assembly which is completed to assemble the sealing ring 4, the needle seat 5, the needle seat positioning sleeve 6, the needle seat central plug 7, the needle body 8 and the needle protecting cover 9 into an integral structure, as shown in fig. 18.

The combination of the above combined group components and the assembled push rod 1, the rubber plug 2 and the cylinder body 3 is finally combined, the end surface of the conical hollow inner hole 3-6 of the cylinder body 3 is sleeved into the cylinder body positioning hole 6-5 of the needle seat positioning sleeve 6 for positioning, the end surface of the conical hollow inner hole 3-6 is contacted with the hole position end surface 6-53 of the cylinder body positioning hole 6-5, the first annular convex rib 3-5 of the excircle passes through the second annular convex rib 6-52 of the combined hole wall to be tightly positioned without loosening, and the second annular plane 6-51 with the axis limited is contacted with the first annular plane 3-4 with the axis limited at the same time to ensure that the integral structure is kept consistent with the straight line of the central shaft. The hollow cylinder 5-5 of the needle seat 5 and the sealing ring 4 enter the conical hollow inner hole 3-6 together, and the outer edge of the sealing ring 4 is in close contact with the inner wall of the conical hollow inner hole 3-6 in an extruding way to start sealing. The whole micro high-precision recovery destruction type full injector structure assembly is completed. Referring to the schematic diagram of the components of the fully assembled micro high precision full syringe, as shown in fig. 19.

Using the operating procedure (one), the step of venting is performed before the extraction of the dose: the needle protecting cover 9 is removed, the push rod 2 is pushed towards the cylinder body until the rubber plug 2 contacts the bottom of the cylinder body 3, and residual air is completely emptied. The four first convex ribs 1-52 on the edge of the semispherical endpoint 51 at the front end of the push rod 1 penetrate through the small-diameter round hole 5-8 of the needle seat 5 and enter the central hollow hole 5-9, and the convex cylinder 5-6 on the circumference of the hollow cylinder 5-5 forms a pressing contact with the rubber plug 2. Before the medicine is extracted, the residual air in the cylinder body is completely emptied, so that the medicine entering the cylinder body during the medicine extraction is completely consistent with the scale. The purpose of executing exhaust is to easily control the precision of medicament extraction, more importantly to recover the lubrication of the rubber plug to reduce the friction resistance with the inner wall of the cylinder body, the operation is smoother, because the rubber plug is made of an elastomer, although the inner wall of the cylinder body is coated with a lubricant (medical silicon oil) before assembly, the outer edge of the rubber plug and the cylinder wall form extrusion contact after airtight and targeted combination, the rubber plug can be stored for a long time to discharge the lubricant on the contact surface, so that the movement resistance of the rubber plug and the cylinder wall is increased and is not forced to be smooth in operation, the execution of the exhaust to recover the lubrication of the rubber plug to reduce the friction resistance with the inner wall of the cylinder body is smoother, and. Referring to the operation flow, the operation of each component in the air exhausting step before the medicine extraction is schematically shown in FIG. 20.

Using the operational procedure (two), performing the extraction of the medicament: the needle point 8-1 of the needle body 8 is immersed into the medicament, if the medicament is bottled, the needle point 8-1 is pierced through a soft rubber plug at the bottle mouth to immerse the medicament, the square handle 1-1 of the push rod 1 is pulled, the rubber plug 2 is separated from the bottom of the inner hole of the cylinder body 3 to retreat, four first convex ribs 1-52 at the edge of a hemispherical endpoint 1-51 at the front end of the push rod 1 are separated from a central hollow hole 5-9 of the needle seat 5 through a small-diameter round hole 5-8, the medicament is sucked into the inner hole of the cylinder body 3 along with the movement distance until the position of a lip-like annular structure 2-3 of the rubber plug 2 and the metering scale on the surface of the cylinder body complete the extraction of the medicament meter, and the needle point 8-1 of. Referring to the operation flow-the operation of each component for extracting the medicament is performed, as shown in fig. 21.

Using operational procedure (iii), a medicament injection is performed: the needle point 8-1 of the needle body 8 pierces the skin of the human body to reach the injection part, the push rod 1 is pushed to drive the square handle 1-1 to make the rubber plug 2 advance towards the bottom of the inner hole of the cylinder body 3, then the medicament is injected into the human body along with the displacement distance until the rubber plug 2 contacts the bottom of the inner hole of the cylinder body 3, so that the medicament is injected into the human body to complete the injection; the needle tip 8-1 of the needle body 8 is pulled out from the skin of the epidermis of the human body. The relative positions of the components are completely consistent with the exhaust step executed before the medicament is extracted by using the operation flow (I); referring to the operation flow-the schematic diagram of the operation of each component in the exhaust step before the extraction of the medicament, refer to fig. 20.

Using the operation flow (iv), the injection is completed and the needle seat is loosened and withdrawn by rotation: after the injection is finished, the needle tip 8-1 of the needle body 8 is pulled out from the skin of the epidermis of the human body. The position of a third annular convex rib 6-3 on the outer side of the needle seat positioning sleeve 6 is held by fingers of one hand, the square handle 1-1 of the push rod 1 is clamped by fingers of the other hand, and the rotation is performed by 150 degrees in the arrow direction. The third annular convex rib 6-3 of the circumferential convex rib at the outer side of the needle seat positioning sleeve 6 and the square handle 1-1 of the push rod 1 play a good role in preventing slip for the rotating operation, thereby being beneficial to the firmness of the rotating operation. At the moment, the cylinder 1-5 at the tail end of the push rod 1 is positioned in the center of a small-diameter round hole 5-8 of the needle seat 5, four first convex ribs 1-52 at the edge of a hemispherical end point are positioned in a central hollow hole 5-9 and form staggered interference with four second convex ribs 5-7 on the inner wall, so that the push rod 1 rotates to drive the needle seat 5 to synchronously rotate, the convex cylinder 5-2 leaves a concave opening 6-63 clamping point of the convex mountain structure 6-6 due to rotation, and is forced to reach a peak top 6-61 position according to a 45 slope 6-62, so that the needle seat 5, the sealing ring 4 and the needle body 8 are integrally moved towards the inside of the hollow hole of the barrel body 3 in a loosening and withdrawing manner. More importantly, because the sealing ring 4 is made of an elastic body, although lubricant (medical silicone oil) is coated on the inner wall of the barrel body before assembly, the outer edge of the sealing ring 4 is in extrusion contact with the barrel wall after airtight combination, the lubricant is started and discharged from the contact surface after a long time of storage, so that the operation resistance of the sealing ring 4 and the barrel wall is increased, the operation is not favorable for the pull-back operation, the rotation loosening and the pull-back operation are performed, the lubrication degree of the sealing ring 4 is reduced, the friction resistance of the inner wall of the barrel body is reduced, and the pull-back operation is smoother. Referring to the operation flow chart-the operation flow chart of rotating and releasing each component of the needle seat after injection is completed is shown in figure 22.

Using operation flow (V), the push rod is pulled back to pull the needle seat needle body to enter the barrel body: the rotary loosening and retreating action is completed, at the moment, the four first convex ribs 1-52 at the edge of the hemispherical end point of the push rod 1 are positioned in the central hollow hole 5-9 of the needle seat 5, and the peripheral diagonal lines of the four first convex ribs 1-52 are larger than the diameter of the small-diameter round hole 5-8 of the needle seat 5, so that the two combination parts are not easy to loosen; the hollow cylinder 5-5 of the needle stand 5 is circumferentially protruded with a cylinder 5-6 to be in extrusion contact with the first end surface 2-5 of the elastomer rubber plug 2; pulling the square handle 1-1 of the push rod 1 by fingers to start the traction action in the arrow direction of figure 23 so as to pull the needle seat 5, the sealing ring 4 and the needle body 4 to be integrated and completely enter the hollow hole of the barrel body 3; the protruding cylinder 5-6 on the circumference of the hollow cylinder 5-5 of the needle base 5 is in extrusion contact with the end surface of the elastomer rubber plug 2, and at the moment, the rubber plug 2 has elasticity to force the needle base 5, the sealing ring 4 and the needle body 8 to be integrally drawn on the small-diameter round hole 5-8 of the needle base 5 by the needle base 5 and the first convex rib 1-52 of the hemispherical end point at the front end of the push rod to be used as a swing fulcrum, so that the needle body 8 is forced to deviate from the central axis; the outer diameter of a circular flange 1-2 of the push rod 1 is slightly larger than the diameter of a triangular annular structure 3-3 protruding from the inner wall of the barrel body 3, and the push rod can be prevented from being separated from the barrel body 3 by pulling back, so that the safety protection effect is realized. Referring to the operation flow, the actuating push rod is pulled back to draw the needle seat needle body into each component of the barrel body, and the action schematic diagram is shown in fig. 23.

Using the operation flow (VI), pushing the push rod forward to execute needle body destruction: the push rod is pulled back to the needle seat 5, the sealing ring 4 and the needle body 8 are integrally and completely enter the hollow hole of the barrel body 3, the push rod 1 is pushed towards the direction of the barrel body 3, the tip of the needle point 8-1 of the needle body 8 can abut against the inner hole oblique conical surface 3-7 of the barrel body 3 or the fourth end surface 7-5 of the central plug 7 of the needle seat to prevent the needle body from continuously moving forward because the needle body 8 is deviated from the central axis, at the moment, the force is increased on the square handle 1-1 of the push rod 1 to force the needle body to be bent and deformed so as to destroy the needle body in the hollow hole of the barrel body 3, and the subsequent processing link can prevent the occurrence of the secondary needle bundle abnormal infection event to a great extent. Referring to the operation flow-the actuation schematic diagram of the components for executing the needle destruction by pushing the push rod forward, as shown in fig. 24.

In short, the above description is only a preferred embodiment of the present invention, and all the equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the scope of the present invention.

Claims

1. A disposable trace high-precision safety syringe comprises a push rod (1), a rubber plug (2) and a barrel body (3), wherein the push rod (1) is matched with the rubber plug (2) and is placed into the barrel body (3) from the upper end of the barrel body, and a needle body (8) is matched with the lower end of the barrel body (3), and is characterized in that a needle seat positioning sleeve (6) is arranged at the lower end of the barrel body (3), a needle seat (5) is matched in the needle seat positioning sleeve (6), and one end of the needle body (8) is fixed on the needle seat (5); the push rod (1) drives the needle seat (5) to rotate and loosen, and simultaneously pulls the needle body (8) into the cylinder body (3) and bends the needle body (8) to be locked in the cylinder body (3).

2. The disposable micro high-precision safety syringe according to claim 1, wherein the rubber plug (2) is made of an elastomer material, the center of the rubber plug is a hollow through round hole (2-1), and the bottom surface of the rubber plug (2) forms a first end surface (2-5); the push rod (1) passes through the hollow through round hole (2-1) of the rubber plug (2) and is matched with the upper part of the needle seat (5); the center of the barrel body (3) is a hollow hole (3-2), and the lower end of the barrel body (3) is a hollow inner hole (3-6).

3. The disposable micro high-precision safety syringe according to claim 2, wherein a hollow cylinder (5-5) is arranged above the outer side of the needle stand (5), a protruding cylinder (5-6) is arranged on the outer circumference of the hollow cylinder (5-5), and the protruding cylinder (5-6) is in pressing contact with the first end face (2-5) of the rubber plug (2); the bottom of the lower end of the push rod (1) is a hemispherical end point (1-51), and four first convex ribs (1-52) are uniformly distributed on the hemispherical end point (1-51); a central hollow hole (5-9) is formed above the needle seat (5), a small-diameter round hole (5-8) is formed above the central hollow hole (5-9), and the diameter of the small-diameter round hole (5-8) is smaller than the distance between the axial lines of the opposite sides of the four first convex ribs (1-52) of the hemispherical end point (1-51) of the push rod (1); four second convex ribs (5-7) parallel to the axis are uniformly distributed on the inner wall of the central hollow hole (5-9), and the first convex ribs (1-52) of the hemispherical end points (1-51) are matched with the second convex ribs (5-7) on the inner wall of the central hollow hole (5-9).

4. The disposable micro high-precision safety syringe according to claim 3, wherein the outside of the needle base (5) is located below the hollow cylinder (5-5), and an annular flange (5-3) and a protruded cylinder (5-2) protruded from two sides of the needle base (5) in 180 degrees are sequentially arranged; the middle section of the needle seat positioning sleeve (6) is provided with a convex mountain structure (6-6) with the inner walls corresponding to 180 degrees, a peak top (6-61) is formed on the convex mountain structure (6-6), a 45-degree slope (6-62) is formed on one side, a concave opening (6-63) vertical to the axis is formed at the bottom of the slope corresponding to the peak top on the other side, the peak top (6-61) is used for supporting an annular flange (5-3) of the needle seat (5), the concave opening (6-63) is used for limiting a convex cylinder (5-2) on two sides of the needle seat (5) in a protruding mode, and the 45-degree slope (6-62) is used for enabling the needle seat (5) to move towards the inside of the cylinder body (3) along the motion track of the convex cylinder (5-2) when the needle seat.

5. The disposable micro high-precision safety syringe according to claim 4, wherein an annular groove (5-4) is arranged between the hollow cylinder (5-5) and the annular flange (5-3) at the outer side of the needle base (5), and a sealing ring (4) is sleeved on the annular groove (5-4); the sealing ring (4) is made of an elastomer material, the structure of the sealing ring is an annular structure with a circular line diameter, and the sealing ring (4) is in extrusion contact with the inner wall of a hollow inner hole (3-6) of the cylinder body (3).

6. The disposable micro high-precision safety syringe according to claim 3, wherein the lower end of the push rod (1) is provided with an annular diamond-shaped protruding structure (1-3) and a tail end cylinder (1-5) in sequence, the tail end cylinder (1-5) is provided with a right-angle annular convex rib (1-4), and the hemispherical end point (1-51) is positioned at the bottom end of the tail end cylinder (1-5); the inner wall of a hollow through round hole (2-1) of the rubber plug (2) is in extrusion fit with a right-angle annular convex rib (1-4) of the push rod (1); an annular diamond concave structure (2-4) which is matched and positioned with the annular diamond convex structure (1-3) of the push rod (1) is arranged at one end of the hollow through round hole (2-1); the outer side of the end is provided with an annular flange (2-2), the outer side of the other end is provided with a lip-like annular structure (2-3), and the bottom end is provided with a first end surface (2-5); the annular flange (2-2) and the lip-like annular structure (2-3) of the rubber plug (2) are in extrusion fit with the inner wall of the hollow hole (3-2) of the cylinder body (3).

7. The disposable micro high-precision safety syringe according to claim 6, wherein the push rod (1) is provided with a circular flange (1-2); a small-diameter convex triangular annular structure (3-3) is formed at an inlet at the upper end of the cylinder body (3), and the push rod (1) is matched with the convex triangular annular structure (3-3) through a circular flange (1-2).

8. The disposable micro high-precision safety syringe according to claim 3, wherein the periphery of the lower end of the barrel body (3) is provided with a first annular plane (3-4) and a first annular convex rib (3-5); the upper section of the needle seat positioning sleeve (6) is a barrel body positioning hole (6-5), the barrel body positioning hole (6-5) is sequentially provided with a second annular plane (6-51), a second annular convex rib (6-52) and an inner hole end surface (6-53) from top to bottom, and the first annular plane (3-4), the first annular convex rib (3-5) and the conical hollow inner hole (3-6) are respectively matched with the second annular plane (6-51), the second annular convex rib (6-52) and the inner hole end surface (6-53).

9. The disposable micro high-precision safety syringe according to claim 8, wherein the lower section of the needle stand positioning sleeve (6) is a needle stand center plug positioning hole (6-7), a needle stand center plug (7) is fixed below the needle stand positioning sleeve (6) through the needle stand center plug positioning hole (6-7), and the center of the needle stand center plug (7) is an axis positioning hole (7-1); the needle seat (5) and the needle body (8) penetrate out of the needle seat central plug (7) through the axis positioning hole (7-1) of the needle seat central plug (7).

10. The disposable micro high-precision safety syringe according to claim 8, wherein the needle base center plug positioning hole (6-7) is provided with a third annular convex rib (6-71), a third annular plane (6-72) and a third end surface (6-73) at the bottom end in sequence from top to bottom; a fourth annular convex rib (7-4), a fourth annular plane (7-3) and a positioning end face (7-2) are sequentially arranged on the outer side of the needle seat central plug (7); the third annular convex ribs (6-71) and the third annular planes (6-72) are respectively matched with the fourth annular convex ribs (7-4) and the fourth annular planes (7-3), and the third end surfaces (6-73) are in contact fit with the positioning end surfaces (7-2).

11. The disposable micro high-precision safety syringe as claimed in claim 3, wherein the upper end of the push rod (1) is provided with a square handle (1-1).

12. The disposable micro high-precision safety syringe according to claim 9, wherein the other end of the needle body (8) penetrates through the central plug (7) of the needle base and is sleeved with a needle protecting cover (9); the upper end of the needle seat positioning sleeve (6) is a flange end, the flange end and the lower outer side of the needle seat positioning sleeve (6) form a second end surface (6-4), and the circumference of the lower outer side of the needle seat positioning sleeve (6) is provided with four third convex ribs (6-3) parallel to the central axis; the center of the needle protecting cover (9) is a central circular cavity (9-2), and the top end of the needle protecting cover (9) is a fifth end surface (9-4); the inner hole wall (9-3) of the central circular cavity (9-2) is matched with the third convex rib (6-3) of the needle seat positioning sleeve (6), and the fifth end surface (9-4) is matched with the second end surface (6-4) of the needle seat positioning sleeve (6).

13. The disposable micro high-precision safety syringe as claimed in claim 12, wherein a fifth annular rib (9-21) is formed at the upper part of the central circular cavity (9-2) of the needle protecting cover (9), a smooth small bump (6-31) is arranged on the third rib (6-3) of the needle holder positioning sleeve (6), and the small bump (6-31) is matched with the fifth annular rib (9-21).

14. The disposable micro high-precision safety syringe according to claim 9, wherein the top end of the needle hub central plug (7) forms a fourth end face (7-5).