Negative pressure syringe

Abstract

The present application provides a negative pressure injector, comprising a core rod, a sleeve and a needle, the sleeve is sleeved on the outside of the core rod, the needle is installed on the front end of the sleeve, a piston is arranged between the front end of the core rod and the sleeve, the core rod is provided with a core rod base, a clamping sleeve is fixed on the outside of the sleeve, a limiting groove is arranged at the rear part of the clamping sleeve, the rear end of the limiting groove is a closed structure; a clamping block is arranged at the rear side of the clamping sleeve, the clamping block comprises a connecting column and a clamping block base, the connecting column is inserted into the limiting groove, the connecting column is provided with a trapezoidal step, the rear end of the trapezoidal step is inclined backward from both sides to the center, the rear end of the limiting step cooperates with the closed structure of the limiting groove, so that the clamping block is easy to be pulled out backward and is not easy to be pushed forward relative to the clamping sleeve; the clamping block base is provided with a clamping groove, the clamping groove clamps the core rod base; the trapezoidal step arranged inside the clamping sleeve or on the surface of the core rod makes the core rod easy to be pulled out backward and not easy to be pushed forward, so that when the core rod is pulled out backward as a whole, the clamping sleeve can limit the core rod to be pushed forward, negative pressure is generated, the injector can automatically suck, the structure is simple, and the use is convenient.

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. The rear end of the core rod protrudes outward to form a core rod base, the outer side of the rear end of the outer sleeve is fixedly provided with a clamping sleeve, the rear part of the clamping sleeve is provided with a limiting groove in the front-rear direction, and the rear end of the limiting groove is a narrowing structure with gradually decreasing width.

[0006] The rear side of the clamping sleeve is provided with a clamping block, the clamping block comprises a connecting column and a clamping block base connected in sequence from front to back, the connecting column is inserted into the limiting groove, the connecting column is provided with a plurality of trapezoidal steps, the trapezoidal steps are arranged across the two sides of the connecting column in the circumferential direction, the rear end of the trapezoidal step is a hypotenuse, the rear end of the trapezoidal step is inclined backward from both sides to the center, and the rear end of the limiting step cooperates with the narrowing structure at the rear end of the limiting groove, so that the clamping block is easily pulled out backward and not easily pushed forward relative to the clamping sleeve.

[0007] The inner side of the clamping block base is provided with a clamping groove in the circumferential direction, and the clamping groove clamps the core rod base.

[0008] Further, the rear end of the connecting column is fixedly connected to the outer side of the front end of the clamping block base, and the outer side of the connecting column is flush with the outer side of the clamping block base.

[0009] Further, the two ends of the clamping groove are widened in the front-rear direction to form a connecting buckle, and the connecting buckle is an arc structure with a central recess.

[0010] Further, the middle part of the inside of the sleeve is recessed to form an arc-shaped opening, and the two ends of the opening are recessed to form buckles in the circumferential direction.

[0011] Further, the upper end of the limiting groove is fixedly connected with the lower end of the opening.

[0012] The negative pressure injector comprises a plunger, a sleeve and a needle, the sleeve is sleeved on the outside of the plunger, the needle is installed on the front end of the sleeve, and a piston is arranged between the front end of the plunger and the sleeve.

[0013] The rib of the cross-shaped rib of the plunger is provided with a plurality of limiting steps, the limiting steps are arranged across the two sides of the rib in the circumferential direction, the rear end of the limiting step is an oblique edge, the rear end of the limiting step is inclined rearward from the two sides to the center, and the rear end of the limiting step is matched with the tapering structure of the limiting groove, so that the plunger is easily pulled out rearward and is not easily pushed forward relative to the sleeve.

[0014] Further, the sleeve comprises a fixed sleeve and a limiting sleeve, the fixed sleeve and the limiting sleeve are arc-shaped half structure, the two ends of the fixed sleeve and the limiting sleeve are matched and connected through concave-convex structures, and the inside of the middle part of the limiting sleeve is provided with a limiting groove.

[0015] Further, a plurality of limiting steps are arranged on one rib of the cross-shaped rib of the plunger.

[0016] Further, one side of the sleeve is provided with an arc-shaped opening, the two ends of the opening are respectively provided with a buckle, the sleeve is clamped with the rear end of the sleeve through the two buckles, and the inside of the middle part of the opening is provided with a limiting groove.

[0017] Further, a plurality of limiting steps are arranged on one or more ribs of the cross-shaped rib of the plunger.

[0018] In the present application, a plurality of trapezoidal steps are arranged on the inside of the sleeve or the surface of the plunger, the upper end of the step is horizontal, and the lower end is inclined, a limiting groove with a tapering opening is arranged in the inside of the sleeve, the limiting groove is clamped with the trapezoidal limiting step in the initial state, the trapezoidal step is easily pulled out rearward and is not easily pushed forward, so that the sleeve can limit the plunger from being pushed forward when the plunger is pulled out rearward as a whole, negative pressure is generated, the injector is automatically pumped, the structure is simple, and the use is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a disassembled structure diagram of Example 1.

[0020] Figure 2 Front view of the card block of Example 1;

[0021] Figure 3 Side view of the card block of Example 1;

[0022] Figure 4 Perspective view of the card block of Example 1;

[0023] Figure 5 Front view of the card sleeve of Example 1;

[0024] Figure 6 Side view of the card sleeve of Example 1;

[0025] Figure 7 Perspective view of the card sleeve of Example 1;

[0026] Figure 8 Overall view of Example 1;

[0027] Figure 9 Another overall view of Example 1;

[0028] Figure 10 View of the card block and card sleeve separated from each other of Example 1;

[0029] Figure 11 View of the card slot and the core separated from each other of Example 1

[0030] Figure 12 Exploded view of Example 2;

[0031] Figure 13 Top view of the limiting card sleeve of Example 2;

[0032] Figure 14 Front view of the limiting card sleeve of Example 2;

[0033] Figure 15 Perspective view of the limiting card sleeve of Example 2;

[0034] Figure 16 Top view of the fixed card sleeve of Example 2;

[0035] Figure 17 Front view of the fixed card sleeve of Example 2;

[0036] Figure 18 Perspective view of the fixed card sleeve of Example 2;

[0037] Figure 19 Overall view of Example 2;

[0038] Figure 20Another overall structural sectional view of Example 2;

[0039] Figure 21 Structural view of the core rod of Example 2;

[0040] Figure 22 Structural view of Figure 28 Structural view of the core rod after clockwise rotation;

[0041] Figure 23 Disassembled structural view of Example 3;

[0042] Figure 24 Top view of the sleeve of Example 3;

[0043] Figure 25 Perspective view of the sleeve of Example 3;

[0044] Figure 26 Overall structural sectional view of Example 3;

[0045] Figure 27 Another overall structural sectional view of Example 3;

[0046] Figure 28 Structural view of the core rod of Example 3;

[0047] Figure 29 Structural view of the core rod after rotation of Example 3.

[0048] Reference signs:

[0049] 1 core rod, 2 piston, 3 outer sleeve, 4 needle, 5 sleeve, 6 clamping block, 7 outer sleeve base,

[0050] 11 rib, 12 core rod base, 13 limiting step,

[0051] 51 opening, 52 clasp, 53 fixed sleeve, 54 limiting sleeve, 55 limiting groove,

[0052] 531 fixed groove, 532 first clasp, 541 fixed block, 542 second clasp,

[0053] 61 connecting column, 62 clamping block base, 611 trapezoidal step, 621 clamping groove, 622 connecting clasp. DETAILED DESCRIPTION

[0054] 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.

[0055] Example 1

[0056] This embodiment discloses a negative pressure injector, such as Figure 1 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 2 is provided between the front end of the core rod 1 and the outer sleeve 3. A core rod base 12 protrudes outward from the rear end of the core rod 1. A retaining sleeve 5 is fixedly provided on the outer side of the rear end of the outer sleeve 3. A limiting groove 55 is provided at the rear of the retaining sleeve 5 along the front-back direction. The rear end of the limiting groove 55 has a tapered structure with a gradually narrowing width.

[0057] The back of the card sleeve 5 has a card block 6, such as Figures 2-4 As shown, the locking block 6 includes a connecting post 61 and a locking block base 62 connected sequentially from front to back. The connecting post 61 is inserted into the limiting groove 55. The rear end of the connecting post 61 is fixedly connected to the outer side of the front end of the locking block base 62. The outer side of the connecting post 61 is flush with the outer side of the locking block base 62. The connecting post 61 is provided with several trapezoidal steps 611. The trapezoidal steps 611 are arranged circumferentially across both sides of the connecting post 61. The rear end of the trapezoidal steps 611 is a sloping side. The rear end of the trapezoidal steps 611 slopes backward from both sides to the center. The rear end of the trapezoidal steps 611 cooperates with the closing structure of the rear end of the limiting groove 55, so that the locking block 6 is easy to pull backward relative to the locking sleeve 5, but not easy to push forward.

[0058] The inner side of the locking block base 62 has a circumferentially provided locking groove 621. Two connecting buckles 622 are provided at both ends of the locking groove 621 in the front-back direction. The connecting buckles 622 have a centrally recessed arc-shaped structure. The connecting buckles 622 facilitate the entry of the core rod base 12 into the locking groove 621. When the locking groove 621 clamps the core rod base 12, the narrower locking groove 621 between the two connecting buckles 622 fits tightly against the core rod base 12 in the front-back direction, allowing the locking block 6 to be pulled out only horizontally. (See [reference]). Figure 11 .

[0059] like Figures 5-7 As shown, the inner side of the sleeve 5 has a recessed arc-shaped opening 51 in the middle, and the two ends of the opening 51 are recessed with buckles 52 along the circumferential direction. The rear end of the outer sleeve 3 protrudes outward and has an outer sleeve base 7. The outer sleeve base 7 is embedded in the buckles 52. The upper end of the limiting groove 55 is fixedly connected to the lower end of one side of the opening 51.

[0060] like Figure 6 As shown, the limiting groove 55 includes a limiting body and a limiting outlet arranged vertically. The width of the limiting body is equal from top to bottom. The limiting outlet includes an upper outlet and a lower outlet arranged vertically. The width of the upper outlet gradually decreases from top to bottom and cooperates with the trapezoidal step 611. The width of the lower outlet is equal from top to bottom, which strengthens the limiting outlet and prevents the rear end of the limiting groove 55 from deforming due to the squeezing of the trapezoidal step 611.

[0061] The syringe is controlled at 1-2 ml when sucking outward, and the precise control is performed outward according to the scale, such as Figure 8 and Figure 9 shown,

[0062] The core rod 1 is pulled to the required scale, the limiting groove 55 on the sleeve 5 cooperates with the trapezoidal step 611 of the clamping block 6, the core rod 1 cannot be pushed forward, a negative pressure is formed, and automatic suction is performed.

[0063] During the test, as shown in Figure 10 and Figure 11 , the core rod 1 is continuously pulled outward, the clamping block 6 is separated from the sleeve 5, the clamping block 6 is pulled off from the core rod base 12, and the test liquid is pushed out.

[0064] Embodiment 2

[0065] The embodiment discloses a negative pressure syringe, as shown in Figure 12 , comprising 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 at the front end of the outer sleeve 3, and the front end of the core rod 1 is provided with a piston 2 between the outer sleeve 3, the negative pressure syringe further comprises a base 6 and a sleeve 5, the base 6 is arranged around the rear end of the outer sleeve 3, the sleeve 5 is clamped at the upper and lower ends of the base 6, the inner side of the lower part of the sleeve 5 is protruded and provided with a limiting groove 55, and the limiting groove 55 is provided in a structure that is gradually narrowed in width from front to back.

[0066] The rib 11 of the cross rib of the core rod 1 is provided with a plurality of limiting steps 13, the limiting steps 13 are arranged along the circumferential direction and across the two sides of the rib 11, the limiting groove 55 can accommodate the rib 11 to pass through and block the limiting steps 13, so as to limit the axial forward movement of the core rod 1.

[0067] Specifically, the rear end of the limiting step 13 is a bevel, the rear end of the limiting step 13 is inclined backward from the two sides to the center, and the rear end of the limiting step 13 cooperates with the narrowing structure of the limiting groove 55, so that the core rod 1 is easy to be pulled backward out of the sleeve 5 and is not easy to be pushed forward.

[0068] The sleeve 5 comprises a fixed sleeve 53 and a limiting sleeve 54, as shown in Figures 13-18 , the fixed sleeve 53 and the limiting sleeve 54 are in an arc-shaped half-and-half structure, the two ends of the fixed sleeve 53 and the limiting sleeve 54 are connected through concave-convex structure cooperation, the fixed grooves 531 at the two ends of the fixed sleeve 53 cooperate with the fixed blocks 541 at the two ends of the limiting sleeve 54, the two ends of the fixed sleeve 53 are further provided with first buckles

[0069] 532, the two ends of the limiting sleeve 54 are further provided with second buckles 542, the first buckles 532 and the second buckles 542 are located on the inner side of the fixed grooves 531 and the fixed blocks 541, the first buckles 532 and the second buckles 542 further cooperate with the outer sleeve 3, limit the relative movement among the fixed sleeve 53, the limiting sleeve 54 and the outer sleeve 3, and the whole is referred toFigure 19 and Figure 20 .

[0070] The inner side of the middle part of the limiting sleeve 54 is provided with a limiting groove 55, and the limiting sleeve 54 cooperates with the core rod 1 through the limiting groove 55 to limit the axial forward movement of the core rod 1.

[0071] In this embodiment, as shown in Figure 21 , a plurality of limiting steps 13 are arranged on one rib 11 of the cross-shaped ribs of the core rod 1.

[0072] When the syringe is used for sucking outward, the control is 1-2 ml, and the accurate control is performed according to the scale. The core rod 1 is pulled to the required scale, the limiting groove 55 on the limiting sleeve 54 cooperates with the limiting step 13 on the core rod 1, the core rod 1 cannot move forward, and a negative pressure is formed to automatically suck.

[0073] When the test is performed, as shown in Figure 22 , the core rod 1 is continuously pulled outward, the limiting step 13 on the core rod 1 is separated from the limiting groove 55 on the limiting sleeve 54, the core rod 1 is rotated again, and the test liquid is pushed out.

[0074] Embodiment 3

[0075] This embodiment discloses a negative pressure syringe, as shown in Figure 23 , Figure 26 and Figure 27 , which 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 at the front end of the outer sleeve 3, and the front end of the core rod 1 is provided with a piston 2 between the core rod 1 and the outer sleeve 3. The negative pressure syringe further comprises a base 6 and a sleeve 5. The base 6 is arranged around the rear end of the outer sleeve 3, and the sleeve 5 is connected with the upper and lower ends of the base 6. The inner side of the lower part of the sleeve 5 is protruded and provided with a limiting groove 55. The limiting groove 55 is in a structure of gradually narrowing width from front to back.

[0076] The rib 11 of the cross-shaped rib of the core rod 1 is provided with a plurality of limiting steps 13. The limiting steps 13 are arranged along the circumferential direction and cross the two sides of the rib 11. The limiting groove 55 can accommodate the rib 11 to pass through and block the limiting steps 13, so as to limit the axial forward movement of the core rod 1.

[0077] Specifically, the rear end of the limiting step 13 is a bevel. The rear end of the limiting step 13 is inclined backward from the two sides to the center. The rear end of the limiting step 13 cooperates with the narrowing structure of the limiting groove 55, so that the core rod 1 is easy to be pulled backward relative to the sleeve 5 and is not easy to be pushed forward.

[0078] As shown in Figure 24 and Figure 25 , one side of the sleeve 5 is provided with an arc-shaped clamping opening. The two ends of the clamping opening are respectively provided with a clasp 52. The sleeve 5 is connected with the rear end of the outer sleeve 3 through the two clasps 52, and the inner side of the middle part of the opening is provided with a limiting groove 55.

[0079] In this embodiment, as shown in Figure 28 One or more ribs 11 of the cross rib of the core rod 1 are provided with a plurality of limiting steps 13.

[0080] When the syringe is sucked outward, it is controlled at 1-2ml, and the precise control is performed according to the scale. The core rod 1 is pulled to the required scale. The limiting groove 55 on the sleeve 5 cooperates with the limiting step 13 on the core rod 1. The core rod 1 cannot move forward, and a negative pressure is formed to automatically suck.

[0081] When the test is performed, as shown in Figure 29 The core rod 1 is continuously pulled outward, the limiting step 13 on the core rod 1 is separated from the limiting groove 55 on the sleeve 5, and the core rod 1 is rotated to push out the test liquid.

[0082] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for 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, the outer sleeve being sleeved on the outside of the core rod, and the needle being mounted on the front end of the core rod. The front end of the outer sleeve, the front end of the core rod and the outer sleeve are provided with a piston, characterized in that, The rear end of the core rod is outwardly protruding and provided with a core rod base, and the rear end of the outer sleeve is outwardly fixedly provided with a sleeve, the rear part of the sleeve is provided with a limiting slot in the front-rear direction, and the rear end of the limiting slot is a narrowing structure with gradually decreasing width. The rear side of the sleeve is provided with a clamping block, the clamping block comprises a connecting column and a clamping block base connected in sequence from front to back, the connecting column is inserted into the limiting slot, the connecting column is provided with a plurality of trapezoidal steps, the trapezoidal steps are arranged across the two sides of the connecting column in the circumferential direction, the rear end of the trapezoidal step is a bevel, the rear end of the trapezoidal step is inclined backward from both sides to the center, and the rear end of the trapezoidal step cooperates with the narrowing structure at the rear end of the limiting slot, so that the clamping block is easily pulled out backward and not easily pushed forward relative to the sleeve. The inner side of the clamping block base is provided with a clamping slot in the circumferential direction, and the clamping slot clamps the core rod base. The rear end of the connecting column is fixedly connected with the outer side of the front end of the clamping block base, and the outer side of the connecting column is flush with the outer side of the clamping block base. The two ends of the clamping slot are widened in the front-rear direction and provided with connecting buckles, the connecting buckles are arc-shaped structures with a central recess. The middle part of the inner side of the sleeve is recessed and provided with an arc-shaped opening, the two ends of the opening are recessed and provided with buckles in the circumferential direction, the rear end of the outer sleeve is outwardly protruding and provided with an outer sleeve base, and the outer sleeve base is embedded in the buckles. The upper end of the limiting slot is fixedly connected with the lower end of one side of the opening.

2. A negative pressure syringe comprising a plunger, a sheath sleeved on the outside of the plunger, and a needle mounted on the front end of the sheath, a piston being provided between the front end of the plunger and the sheath, characterized in that, It also comprises a base and a sleeve, the base is arranged around the rear end of the outer sleeve, the sleeve is clamped with the upper and lower ends of the base, the inner side of the lower part of the sleeve is outwardly protruding and provided with a limiting slot, and the limiting slot is a narrowing structure with gradually decreasing width from front to back. The rib of the core rod cross rib is provided with a plurality of limiting steps, the limiting steps are arranged across the two sides of the rib in the circumferential direction, the rear end of the limiting step is a bevel, the rear end of the limiting step is inclined backward from both sides to the center, and the rear end of the limiting step cooperates with the narrowing structure of the limiting slot, so that the core rod is easily pulled out backward and not easily pushed forward relative to the sleeve. The sleeve comprises a fixed sleeve and a limiting sleeve, the fixed sleeve and the limiting sleeve are arc-shaped half-and-half structures, the two ends of the fixed sleeve and the limiting sleeve are connected through concave-convex structures, the fixed grooves at the two ends of the fixed sleeve cooperate with the fixed blocks at the two ends of the limiting sleeve, the two ends of the fixed sleeve are also provided with first buckles, the two ends of the limiting sleeve are also provided with second buckles, the first buckles and the second buckles are located inside the fixed grooves and the fixed blocks, the first buckles and the second buckles cooperate with the outer sleeve to limit the relative movement among the fixed sleeve, the limiting sleeve and the outer sleeve, and the inner side of the middle part of the limiting sleeve is provided with a limiting slot.

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