Negative pressure syringe

Abstract

The present application provides a kind of negative pressure injector, including core rod, outer sleeve and needle, the outer sleeve is sleeved on the outside of core rod, the needle is installed at the front end of outer sleeve, the front end of core rod is equipped with piston between outer sleeve, it is characterized in that, the rear end of outer sleeve is equipped with outer sleeve base, the outside of outer sleeve base is fixedly provided with clamping sleeve, the clamping sleeve is equipped with spring plunger, the spring plunger is threadedly connected with clamping sleeve, the surface of core rod cross rib is equipped with clamping groove, the spring plunger is positioned with clamping groove, to limit the axial movement of core rod rearward;The present application utilizes buckle principle and combines spring plunger positioning, clamping sleeve is designed between core rod and outer sleeve, when core rod is pulled back to specific position, clamping sleeve hinders core rod to push forward, generates negative pressure, so that injector automatic suction, simple structure, convenient to use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical syringe, in particular to a negative pressure syringe. BACKGROUND

[0002] The syringe is generally composed of a cylindrical hollow needle cylinder, a piston push rod installed in the hollow needle cylinder, a fixed stroke piston matched with the front end of the piston push rod, and a needle head at the front end of the needle cylinder. In use, the piston is in interference fit with the inner wall of the needle cylinder to form a closed space for sucking or pushing liquid. In the prior art, during daily diagnosis and treatment, blood vessel puncture, thoracic and abdominal cavity fluid puncture, and extraction of non-homogeneous liquids such as pus, ascites and pleural effusion are performed on patients. When the liquid is relatively thick, the liquid flows slowly, the negative pressure in the syringe increases, and the time is relatively long. Especially in the case of a large number of patients, it is difficult to maintain the negative pressure state in the syringe for a long time with finger strength. SUMMARY

[0003] The purpose of the present application is to provide a negative pressure syringe.

[0004] In order to achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0005] The negative pressure syringe comprises a core rod, an outer sleeve and a needle head, the outer sleeve is sleeved on the outer side of the core rod, the needle head is installed at the front end of the outer sleeve, and a piston is arranged between the front end of the core rod and the outer sleeve, characterized in that the rear end of the outer sleeve is provided with an outer sleeve base, the outer side of the outer sleeve base is fixedly provided with a clamping sleeve, the clamping sleeve is provided with a spring plunger, the spring plunger is in threaded connection with the clamping sleeve, the surface of the cross-shaped rib of the core rod is provided with a clamping groove, and the spring plunger is positioned in cooperation with the clamping groove to limit the axial backward movement of the core rod.

[0006] Further, the outer edge of the cross-shaped rib of the core rod is provided with an arc-shaped clamping groove along the radial direction of the outer sleeve, and the clamping sleeve is clamped with the outer end of the cross-shaped rib of the core rod through the spring plunger.

[0007] Further, the lower end of the middle part of the clamping sleeve is provided with a connecting buckle, a screw hole is arranged through the center in the radial direction of the connecting buckle, and the spring plunger is in threaded connection with the screw hole.

[0008] Further, the two ends of the clamping sleeve are provided with fixed buckles which are hollow along the circumferential direction of the outer sleeve, the fixed buckles are clamped with the outer sleeve base, the middle part of the clamping sleeve is bent outward, the inner side of the middle part of the clamping sleeve is protruded to be provided with a limiting buckle, and the limiting buckle limits the rotation of the core rod.

[0009] Further, the two side panels of the cross-shaped rib of the core rod are provided with arc-shaped clamping grooves along the circumferential direction of the outer sleeve, and the clamping sleeve is clamped with the two side panels of the cross-shaped rib of the core rod through the spring plunger.

[0010] Further, the lower end of the middle part of the sleeve is provided with two limiting buckles, the limiting buckles are arranged at intervals along the circumference of the sleeve, the limiting buckles limit the rotation of the core rod, and the two limiting buckles are both provided with screw holes along the circumference, and the spring plunger is in threaded connection with the screw holes.

[0011] Further, the two ends of the sleeve are provided with fixed buckles which are hollow along the circumference of the sleeve, and the fixed buckles are in clamping connection with the sleeve base.

[0012] The negative pressure injector comprises a core rod, a sleeve and a needle, the sleeve is sleeved on the outer side of the core rod, the needle is installed at the front end of the sleeve, and a piston is arranged between the front end of the core rod and the sleeve, characterized in that the rear end of the sleeve is provided with a sleeve base, each rib of the cross-shaped rib of the core rod is provided with a clamping groove, the clamping groove is located at the rear part of the rib, the front end of the clamping groove is protruded rearward to form a limiting rib, the rear end of the clamping groove is protruded forward to form a buckle, and the buckle is folded outward to limit the sleeve base.

[0013] Further, the buckle is pressed inward to be located at the inner side of the limiting rib, and the front end of the buckle is in interference fit with the rear end of the limiting rib.

[0014] The present application utilizes the buckle connection design between the sleeve and the core rod to realize the circumferential limiting, and the spring plunger can be positioned on the rib of the core rod, when the core rod is pulled rearward, the axial forward movement and the circumferential rotation of the core rod are limited, negative pressure is generated, so that the injector can automatically suck, the structure is simple, and the use is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the exploded view of example 1;

[0016] Figure 2 It is the front view of the sleeve of example 1;

[0017] Figure 3 It is the side view of the sleeve of example 1;

[0018] Figure 4 It is the top view of the sleeve of example 1;

[0019] Figure 5 It is the sectional view of the overall structure of example 1;

[0020] Figure 6 It is another sectional view of the overall structure of example 1;

[0021] Figure 7 It is still another sectional view of the overall structure of example 1;

[0022] Figure 8 It is the exploded view of example 2;

[0023] Figure 9 Front view structure diagram of the card sleeve of Example 2;

[0024] Figure 10 Side view structure diagram of the card sleeve of Example 2;

[0025] Figure 11 Top view structure diagram of the card sleeve of Example 2;

[0026] Figure 12 Overall structure sectional view of Example 2;

[0027] Figure 13 Another overall structure sectional view of Example 2;

[0028] Figure 14 Still another overall structure sectional view of Example 2;

[0029] Figure 15 Disassembled structure diagram of Example 3;

[0030] Figure 16 Overall structure sectional view of Example 3;

[0031] Figure 17 Overall structure sectional view of Example 3 when the clasp is turned outwards;

[0032] Figure 18 Overall structure sectional view of Example 3 when the clasp is fitted into the limiting rib.

[0033] Reference signs:

[0034] 1 core rod, 2 piston, 3 outer sleeve, 4 needle, 5 card sleeve, 6 spring plunger, 7 outer sleeve base,

[0035] 11 rib, 12 card slot, 121 first card slot, 122 protrusion, 123 second card slot,

[0036] 51 screw hole, 52 limiting clasp, 53 fixed clasp, 54 connecting buckle,

[0037] 13 limiting rib, 14 clasp. DETAILED DESCRIPTION

[0038] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0039] Example 1

[0040] This embodiment discloses a negative pressure injector, such as Figure 1 andFigure 5 As shown in the drawings, the negative pressure injector comprises a core rod 1, an outer sleeve 3 and a needle 4, the outer sleeve 3 is sleeved on the outer side of the core rod 1, the needle 4 is installed on the front end of the outer sleeve 3, a piston 2 is arranged between the front end of the core rod 1 and the outer sleeve 3, an arc-shaped clamping groove 12 is arranged on the outer edge of each rib 11 of the cross rib of the core rod 1 along the radial direction of the outer sleeve 3, the clamping grooves 12 on one rib 11 are arranged at equal intervals along the axial direction, preferably three clamping grooves 12 are arranged on one rib 11, and the rear end of the outer sleeve 3 is provided with an outer sleeve base 7, and the outer side of the outer sleeve base 7 is fixedly provided with a clamping sleeve 5.

[0041] As shown in the drawings, Figures 2-4 the lower end of the middle part of the clamping sleeve 5 is provided with a connecting buckle 54, a threaded hole 51 is arranged in the center of the connecting buckle 54 and penetrates in the radial direction, a spring plunger 6 is threadedly connected in the threaded hole 51, and the inner end of the spring plunger 6 is positioned in cooperation with the clamping groove 12 after the spring plunger 6 is screwed.

[0042] The upper and lower ends of the clamping sleeve 5 are inwardly folded to form a connecting groove in the middle part of the clamping sleeve 5, the two ends of the clamping sleeve 5 are hollowed out along the circumferential direction of the outer sleeve 3 and are provided with fixed buckles 53, and the connecting groove is clamped with the upper and lower ends of the outer sleeve base 7 in combination with the fixed buckles 53.

[0043] The middle part of the clamping sleeve 5 is outwardly bent, the inner side of the middle part of the clamping sleeve 5 is protruded and provided with a limiting buckle 52, the limiting buckle 52 is closely combined with the core rod 1, and the core rod 1 is limited to rotate by the limiting buckle 52.

[0044] As shown in the drawings, Figures 5-7 in use, the syringe is controlled to suck 1-2 ml outward, and the precise control is performed outward according to the scale, the core rod 1 is pulled to the target position, at this time, the spring plunger 6 is positioned and cannot move inward, and a negative pressure is formed to automatically suck.

[0045] In the test, the core rod 1 is pushed to separate the core rod 1 from the spring plunger 6 and push out the test liquid.

[0046] Embodiment 2

[0047] The embodiment discloses a negative pressure injector, as shown in the drawings, Figure 8 and Figure 12 the negative pressure injector comprises a core rod 1, an outer sleeve 3 and a needle 4, the outer sleeve 3 is sleeved on the outer side of the core rod 1, the needle 4 is installed on the front end of the outer sleeve 3, a piston 2 is arranged between the front end of the core rod 1 and the outer sleeve 3, arc-shaped clamping grooves 12 are arranged on the two side panels of each rib 11 of the cross rib of the core rod 1 along the circumferential direction of the outer sleeve 3, and the clamping grooves 12 on one rib 11 are arranged at equal intervals along the axial direction.

[0048] As shown in the drawings, Figures 9-11As shown, the lower end of the middle part of the sleeve 5 is provided with two limiting buckles 52. The limiting buckles 52 are spaced apart along the circumference of the outer sleeve 3. The limiting buckles 52 restrict the rotation of the core rod 1. Both limiting buckles 52 are provided with threaded holes 51 along the circumference. Spring plungers 6 are provided in the threaded holes 51. The two ends of the sleeve 5 are provided with fixing buckles 53 with openwork along the circumference of the outer sleeve 3. The fixing buckles 53 are engaged with the outer sleeve base 7.

[0049] like Figures 12-14 As shown, the syringe is controlled to aspirate 1-2 ml when drawing outwards. It is precisely controlled outwards according to the scale. Pull the core rod 1 to the target position. At this time, the spring plunger 6 is positioned and cannot move inwards, forming a negative pressure for automatic aspiration.

[0050] During testing, push the core rod 1 to separate it from the spring plunger 6 and push out the test liquid.

[0051] Example 3

[0052] This embodiment discloses a negative pressure injector, such as Figure 15 As shown, it includes a core rod 1, an outer sleeve 3, and a needle 4. The outer sleeve 3 is fitted onto the outside of the core rod 1, and the needle 4 is installed at the front end of the outer sleeve 3. A piston is provided between the front end of the core rod 1 and the outer sleeve 3. An outer sleeve base 7 is provided at the rear end of the outer sleeve 3. A slot 12 is provided on each of the cross ribs 11 of the core rod 1. The slot 12 is located at the rear of the rib 11.

[0053] like Figure 16 As shown, the front end of the slot 12 protrudes rearward and is provided with a limiting rib 13, while the rear end of the slot 12 protrudes forward and is provided with a buckle 14. The buckle 14 can be folded outward using external force, such as... Figure 17 As shown, at this time, the buckle 14 limits the outer sleeve base 7, preventing the core rod 1 from moving forward axially; when external force is applied again to press the buckle 14 inward, as... Figure 18 As shown, the front end of the buckle 14 is interference-fitted with the rear end of the limiting rib 13. The buckle 14 is inserted into the inner side of the limiting rib 13 and is limited by the limiting rib 13, so it will not easily come out and affect the operation.

[0054] The difference between this embodiment and embodiments 1 and 2 is that the sleeve 5 and spring plunger 6 are not used; the axial positioning of the core rod 1 is achieved solely through the irregular structure of the slot 12.

[0055] When drawing fluid outwards, the syringe volume is controlled at 1-2 ml, precisely controlled according to the scale. When the plunger 1 is pulled back to a specific position, the latch 14 is folded outwards, pressing against the outer casing base 7, preventing the plunger 1 from being pushed forward. Figure 17 As shown, a negative pressure is formed inside the core rod 1 to enable automatic suction.

[0056] During the test, if Figure 18As shown, the buckle 14 is loaded into the limiting rib 13, and the test liquid is pushed out.

[0057] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A negative pressure injector, comprising a core rod, an outer sleeve, and a needle, wherein the outer sleeve is fitted over the outside of the core rod, the needle is mounted at the front end of the outer sleeve, and a piston is provided between the front end of the core rod and the outer sleeve, characterized in that, The outer sleeve has an outer sleeve base protruding outward at its rear end. A retainer is fixedly provided on the outer side of the outer sleeve base. The retainer has a spring plunger. The spring plunger is threadedly connected to the retainer. The surface of the cross rib of the core rod has a groove. The spring plunger is positioned in conjunction with the groove to limit the axial forward movement of the core rod. The outer edge of the core rod cross rib is provided with an arc-shaped groove along the radial direction of the outer sleeve, and the sleeve is engaged with the outer end of the core rod cross rib by a spring plunger; The lower end of the middle part of the card sleeve is provided with a connecting buckle, and a screw hole is provided radially through the center of the connecting buckle. The spring plunger is threadedly connected to the screw hole. The upper and lower ends of the card sleeve are folded inward to form a connecting groove in the middle of the card sleeve. The two ends of the card sleeve are provided with fixing buckles with open cutouts along the circumference of the outer sleeve. The connecting groove and the fixing buckles are engaged with the upper and lower ends of the outer sleeve base. The fixing buckle engages with the outer base, the middle part of the sleeve is bent outward, and a limiting buckle protrudes from the inner side of the middle part of the sleeve to restrict the rotation of the core rod; The two side panels of the core rod cross rib are provided with arc-shaped grooves along the circumference of the outer sleeve, and the sleeve is engaged with the two side panels of the core rod cross rib by a spring plunger. The lower end of the middle part of the sleeve is provided with two limiting buckles. The limiting buckles are spaced apart along the circumference of the sleeve and restrict the rotation of the core rod. Both limiting buckles are provided with threaded holes along the circumference, and the spring plunger is threadedly connected to the threaded holes.

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