A negative pressure syringe

Abstract

The present application provides a kind of negative pressure injector, including core rod, outer sleeve and needle, outer sleeve is sleeved in the outside of core rod, the needle is installed in the front end of outer sleeve, the front end of the core rod is equipped with piston between outer sleeve, still include base and sleeve, the base is arranged around the rear end of outer sleeve, the base includes two symmetrically arranged convex surfaces and two symmetrically arranged flat end surfaces in the circumferential direction, sleeve is connected with the upper and lower ends of flat end surface, the inside of lower part of sleeve is protruded and is equipped with limit block, the outer edge of core rod cross rib is equipped with clamping groove, limit block is positioned with clamping groove, to limit the axial forward movement of core rod;The present application adds a sleeve between core rod and outer sleeve, limit structure is set on the rib of sleeve and core rod cross rib, limit structure limits the axial forward movement of core rod when pulling back core rod, 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, in daily diagnosis and treatment activities, blood vessel puncture, chest 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 for the finger strength to maintain the negative pressure state in the syringe for a long time. 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] A negative pressure syringe, comprising a core rod, an outer sleeve and a needle head, the outer sleeve is sleeved on the outside 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 it further comprises a base and a clamping sleeve, the base is arranged around the rear end of the outer sleeve, the base comprises two symmetrically arranged convex surfaces and two symmetrically arranged flat end surfaces along the circumference, the clamping sleeve is clamped with the upper and lower ends of the flat end surface, the inner side of the lower part of the clamping sleeve is protruded to form a limiting block, the outer edge of the cross-shaped rib of the core rod is provided with a clamping groove, and the limiting block and the clamping groove are matched and positioned to limit the axial forward movement of the core rod.

[0006] Further, the clamping sleeve is arranged along the outer edge of the base, the clamping sleeve is hollow along the circumference and provided with a fixed clasp, and the clamping sleeve is clamped with the base through the fixed clasp.

[0007] Further, the clamping sleeve comprises a clamping sleeve main body and two clamping hoop parts, the clamping hoop parts are connected with the two ends of the clamping sleeve main body respectively, the clamping hoop parts are bent relative to the two ends of the clamping sleeve main body, the clamping sleeve main body is clamped with the upper and lower ends of the flat end surface, and the clamping hoop parts are clamped with the upper and lower ends of the convex surface.

[0008] Further, the cross-sectional shape of the limiting block along the front and rear directions is a right trapezoid, the long straight angle side of the limiting block is fixedly connected with the lower part of the clamping sleeve, the inclined side of the limiting block is lower than the lower end of the clamping sleeve, the inclined side of the limiting block is cut to form a step along the circumference of the outer sleeve, and the step is matched and positioned with the clamping groove.

[0009] Further, the card slot comprises a first card slot, a protrusion and a second card slot connected in sequence from front to back, and the limiting block of the sleeve is limited by the front end of the protrusion or the rear end of the second card slot when the core rod is pushed forward.

[0010] A 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 on the front end of the sleeve, and a piston is arranged between the front end of the core rod and the sleeve, characterized by further comprising a base and a sleeve, the base is arranged around the rear end of the sleeve, the sleeve is connected with the upper and lower ends of the base, the inner side of the lower part of the sleeve is protruded to be provided with a limiting groove, the rib of the cross rib of the core rod is provided with a plurality of limiting steps, the limiting steps are arranged along the circumferential direction and traverse the two sides of the rib, and the limiting groove can accommodate the rib to pass and block the limiting steps to limit the axial forward movement of the core rod.

[0011] Further, the sleeve comprises a fixed sleeve and a limiting sleeve, the fixed sleeve and the limiting sleeve are in an arc-shaped half structure, the two ends of the fixed sleeve and the limiting sleeve are connected through concave-convex structure matching, and the inner side of the middle part of the limiting sleeve is provided with a limiting groove.

[0012] Further, a plurality of limiting steps are arranged on one rib of the cross rib of the core rod.

[0013] Further, one side of the sleeve is provided with an arc-shaped opening, one buckle is arranged at each end of the opening, the sleeve is connected with the rear end of the sleeve through the two buckles, and the inner side of the middle part of the opening is provided with a limiting groove.

[0014] Further, a plurality of limiting steps are arranged on one or more ribs of the cross rib of the core rod.

[0015] The present application adds a sleeve between the core rod and the sleeve, a corresponding set of limiting structures is arranged in two regions of the lower part of the sleeve and the rib of the cross rib of the core rod, respectively, the axial forward movement of the core rod can be limited when the limiting structures are combined, a negative pressure is generated in the core rod to suck the injector, the structure is simple, and the use is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the exploded view of example 1;

[0017] Figure 2 It is the overall structure view of example 1;

[0018] Figure 3 It is the front structure view of the sleeve of example 1;

[0019] Figure 4 It is the side structure view of the sleeve of example 1;

[0020] Figure 5A top view of the sleeve of Example 1;

[0021] Figure 6 A perspective view of the sleeve of Example 1;

[0022] Figure 7 A sectional view of the overall structure of Example 1;

[0023] Figure 8 Another sectional view of the overall structure of Example 1;

[0024] Figure 9 A perspective view of Example 1;

[0025] Figure 10 A perspective view of Figure 9 A perspective view after counterclockwise rotation;

[0026] Figure 11 An exploded view of Example 2;

[0027] Figure 12 A front view of the sleeve of Example 2;

[0028] Figure 13 A top view of the sleeve of Example 2;

[0029] Figure 14 A perspective view of the sleeve of Example 2;

[0030] Figure 15 A perspective view of the overall structure of Example 2;

[0031] Figure 16 Another perspective view of the overall structure of Example 2;

[0032] Figure 17 A perspective view of the core rod of Example 2;

[0033] Figure 18 A perspective view of Figure 17 A perspective view of the core rod after clockwise rotation;

[0034] Figure 19 An exploded view of Example 3;

[0035] Figure 20 A top view of the limiting sleeve of Example 3;

[0036] Figure 21 A front view of the limiting sleeve of Example 3;

[0037] Figure 22 A perspective view of the limiting sleeve of Example 3;

[0038] Figure 23 A top view of the fixing sleeve of Example 3;

[0039] Figure 24 Front view of fixed sleeve of example 3;

[0040] Figure 25 Perspective view of fixed sleeve of example 3;

[0041] Figure 26 Sectional view of overall structure of example 3;

[0042] Figure 27 Another sectional view of overall structure of example 3;

[0043] Figure 28 Structure view of core rod of example 3;

[0044] Figure 29 Structure view of core rod after clockwise rotation; Figure 28

[0045] Disassembled structure view of example 4; Figure 30

[0046] Top view of sleeve of example 4; Figure 31

[0047] Perspective view of sleeve of example 4; Figure 32

[0048] Sectional view of overall structure of example 4; Figure 33

[0049] Another sectional view of overall structure of example 4; Figure 34

[0050] Structure view of core rod of example 4; Figure 35

[0051] Structure view of core rod after rotation of example 4. Figure 36 Reference signs:

[0052] 1 core rod, 2 piston, 3 outer sleeve, 4 needle, 5 sleeve, 6 base,

[0053] 11 rib, 12 clamping groove, 121 first clamping groove, 122 protrusion, 123 second clamping groove, 13 limiting step,

[0054] 51 limiting block, 511 step,

[0055] 52 fixed clasp, 53 fixed sleeve, 54 limiting sleeve, 55 limiting groove, 56 clasp,

[0056] 57 sleeve main body, 58 clamping portion,

[0057]

[0058] ​531 Fixing slot, 532 First buckle, 541 Fixing block, 542 Second buckle,

[0059] 61. convex face, 62. flat face. Detailed Implementation

[0060] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] Example 1

[0062] This embodiment discloses a negative pressure injector, such as Figure 1 As shown, the device 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. The negative pressure injector also includes a base 6 and a retainer 5. The base 6 is arranged around the rear end of the outer sleeve 3.

[0063] like Figure 2 As shown, the base 6 includes two symmetrically arranged boss surfaces 61 and two symmetrically arranged flat end surfaces 62 along the circumference. The sleeve 5 is engaged with the upper and lower ends of the flat end surfaces 62. A limiting block 51 protrudes from the inner side of the lower part of the sleeve 5. A groove 12 is provided on the outer edge of the cross rib of the core rod 1. The limiting block 51 and the groove 12 cooperate to position the core rod 1 and limit its axial forward movement.

[0064] The shape of the limiting block 51 is not limited, as long as the rotating core rod 1 can position the slot 12 and the limiting block 51.

[0065] like Figures 3-6 As shown, the sleeve 5 is set to fit the outer edge of the base 6 in the circumferential direction. The sleeve 5 is provided with a fixing buckle 52 in the circumferential direction. The sleeve 5 is engaged with the base 6 through the fixing buckle 52. In this embodiment, the sleeve 5 is only engaged with the upper and lower ends of the flat end face 62 on one side.

[0066] like Figure 7 and Figure 8 As shown, the card slot 12 includes a first card slot 121, a protrusion 122 and a second card slot 123 connected from front to back. When the core rod 1 is pushed forward, the limiting block 51 of the card sleeve 5 is limited by the front end of the protrusion 122 or the rear end of the second card slot 123.

[0067] like Figure 9As shown, the syringe is controlled to aspirate 1-2 ml when drawing outwards. It is precisely controlled outwards according to the scale. Rotate the core rod 1 counterclockwise, then pull the core rod 1 to the target position, and then rotate the core rod 1 clockwise. At this time, the slot 12 and the sleeve 5 are positioned, and the core rod 1 cannot be pushed forward, thus forming a negative pressure for automatic aspiration.

[0068] During the test, if Figure 10 As shown, rotating the core rod 1 counterclockwise separates the core rod 1 slot 12 from the limiting block 51, thus pushing out the test liquid.

[0069] Example 2

[0070] This embodiment discloses a negative pressure injector, such as Figure 11 As shown, the device 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. The negative pressure injector also includes a base 6 and a retainer 5. The base 6 is arranged around the rear end of the outer sleeve 3. The base 6 includes two symmetrically arranged boss surfaces 61 and two symmetrically arranged flat end surfaces 62 along the circumference. The retainer 5 is engaged with the upper and lower ends of the flat end surfaces 62. A limiting block 51 protrudes from the inner side of the lower part of the retainer 5. A groove 12 is provided on the outer edge of the cross rib of the core rod 1. The limiting block 51 and the groove 12 cooperate to position and limit the axial forward movement of the core rod 1.

[0071] like Figure 12 As shown, the card sleeve 5 is set to fit the outer edge of the base 6 in the circumferential direction, and the card sleeve 5 is provided with a fixing buckle 52 in the circumferential direction. The card sleeve 5 is connected to the base 6 by the fixing buckle 52.

[0072] The card slot 12 includes a first card slot 121, a protrusion 122 and a second card slot 123 connected from front to back. When the core rod 1 is pushed forward, the limiting block 51 of the card sleeve 5 is limited by the front end of the protrusion 122 or the rear end of the second card slot 123.

[0073] In this embodiment, as Figure 17 and Figure 18 As shown, the sleeve 5 is engaged with the upper and lower ends of the flat end face 62 on one side and the protruding surfaces 61 on both sides. The sleeve 5 includes a sleeve body 57 and two clamping parts 58. The two clamping parts 58 are connected to the two ends of the sleeve body 57 to form a whole. The clamping parts 58 are bent relative to the two ends of the sleeve body 5. The sleeve body 5 is engaged with the upper and lower ends of the flat end face 62, and the clamping parts 58 are engaged with the upper and lower ends of the protruding surfaces 61.

[0074] like Figures 12-14 As shown, the cross-sectional shape of the limiting block 51 along the front-back direction is a right trapezoid. The long right-angled side of the limiting block 51 is fixedly connected to the lower part of the sleeve 5. The hypotenuse of the limiting block 51 is lower than the lower end of the sleeve 5. A step 511 is cut along the circumference of the outer sleeve 3 on the hypotenuse of the limiting block 51.Figure 15 and Figure 16 As shown in the figure, the step 511 is matched with the clamping groove 12 to position.

[0075] The syringe is controlled at 1-2ml when sucking outward, and the precise control is performed according to the scale. Figure 17 As shown in the figure, the core rod 1 is rotated clockwise, then pulled to the target position, and then rotated counterclockwise, at this time, the clamping groove 12 and the clamping sleeve 5 are positioned, the core rod 1 cannot be pushed forward, and a negative pressure is formed to automatically suck.

[0076] When testing, as shown in the figure, the core rod 1 is rotated clockwise to separate the clamping groove 12 of the core rod 1 from the limiting block 51, and the test liquid is pushed out. Figure 18 Example 3

[0077] The embodiment discloses a negative pressure syringe, as shown in the figure, 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 a piston 2 is arranged between the front end of the core rod 1 and the outer sleeve 3, the negative pressure syringe further comprises a base 6 and a clamping sleeve 5, the base 6 is arranged around the rear end of the outer sleeve 3, the clamping sleeve 5 is clamped with the upper and lower ends of the base 6, the inner side of the lower part of the clamping sleeve 5 is protruded to form a limiting groove 55, the cross rib 11 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, and the limiting groove 55 can accommodate the rib 11 to pass and block the limiting steps 13, so as to limit the axial forward movement of the core rod 1.

[0078] Figure 19 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 is matched with the closing structure of the limiting groove 55, so that the core rod 1 is easy to be pulled backward relative to the clamping sleeve 5 and is not easy to be pushed forward.

[0079] The clamping sleeve 5 comprises a fixed clamping sleeve 53 and a limiting clamping sleeve 54, as shown in the figure, the fixed clamping sleeve 53 and the limiting clamping sleeve 54 are arc-shaped half structure, the two ends of the fixed clamping sleeve 53 and the limiting clamping sleeve 54 are connected through concave-convex structure matching, the fixed groove 531 at the two ends of the fixed clamping sleeve 53 is matched with the fixed block 541 at the two ends of the limiting clamping sleeve 54, the two ends of the fixed clamping sleeve 53 are further provided with a first buckle 532, the two ends of the limiting clamping sleeve 54 are further provided with a second buckle 542, the first buckle 532 and the second buckle 542 are located on the inner side of the fixed groove 531 and the fixed block 541, the first buckle 532 and the second buckle 542 are further matched with the outer sleeve 3 to limit the relative movement among the fixed clamping sleeve 53, the limiting clamping sleeve 54 and the outer sleeve 3, and the whole is shown in

[0080] Figures 20-25 Figure 26 Figure 27

[0081] ​​​​​The inner side of the middle part of the limiting sleeve 54 is provided with a limiting groove 55, the limiting sleeve 54 cooperates with the core rod 1 through the limiting groove 55, and the axial forward movement of the core rod 1 is limited.

[0082] In this embodiment, as shown in the figure, Figure 28 the cross rib of the core rod 1 is provided with a plurality of limiting steps 13 on one rib 11.

[0083] The syringe is controlled at 1-2 ml when sucking outward, 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 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.

[0084] When testing, as shown in the figure, 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 limiting sleeve 54, the core rod 1 is rotated again, and the test liquid is pushed out.

[0085] Embodiment 4

[0086] This embodiment discloses a negative pressure syringe, as shown in the figures, Figure 30 , Figure 33 and Figure 34 , 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, a piston 2 is arranged between the front end of 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, 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 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 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.

[0087] 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 closing 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.

[0088] As shown in the figures, Figure 31 and Figure 32 , one side of the sleeve 5 is provided with an arc-shaped opening, one buckle 56 is arranged at each end of the opening, the sleeve 5 is connected with the rear end of the outer sleeve 3 through the two buckles 56, and the inner side of the middle part of the opening is provided with a limiting groove 55.

[0089] In this embodiment, as shown in the figure, Figure 35 one or more ribs 11 of the cross rib of the core rod 1 are provided with a plurality of limiting steps 13.

[0090] The syringe is controlled at 1-2ml when sucking outward, and the precise control is carried out 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 the negative pressure is formed to automatically suck.

[0091] When testing, as shown, 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 testing liquid. Figure 36

[0092] 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 syringe comprising a plunger, a jacket and a needle, the jacket being sleeved on the outside of the plunger, the needle being installed on the front end of the jacket, a piston being arranged between the front end of the plunger and the jacket, characterized in that, The base is arranged around the rear end of the outer sleeve, and the base comprises two symmetrically arranged convex surfaces and two symmetrically arranged flat end surfaces in the circumferential direction. The clamping sleeve is arranged along the outer edge of the base in the circumferential direction, and the clamping sleeve is provided with a fixed clasp in the circumferential direction. The clamping sleeve comprises a clamping sleeve main body and two clamping hoop portions, the clamping hoop portions are respectively connected to the two ends of the clamping sleeve main body, the clamping hoop portions are bent relative to the two ends of the clamping sleeve main body, the clamping sleeve main body is clamped to the upper and lower ends of the flat end surface, and the clamping hoop portions are clamped to the upper and lower ends of the convex surface. The cross section of the limiting block in the front-rear direction is a right trapezoid, the long straight side of the limiting block is fixedly connected to the lower part of the clamping sleeve, the inclined side of the limiting block is lower than the lower end of the clamping sleeve, the inclined side of the limiting block is provided with a step in the circumferential direction of the outer sleeve, and the step is positioned in cooperation with the clamping groove. The clamping groove comprises a first clamping groove, a protrusion and a second clamping groove connected in sequence from front to back, and the limiting block of the clamping sleeve is limited by the front end of the protrusion or the rear end of the second clamping groove when the core rod is pushed forward.

2. A negative pressure syringe comprising a plunger, a jacket, and a needle, the jacket being fitted to the outside of the plunger, the needle being mounted to the front end of the jacket, a piston being provided between the front end of the plunger and the jacket, characterized in that, The base is arranged around the rear end of the outer sleeve, and the clamping sleeve is clamped to the upper and lower ends of the base, the inner side of the lower part of the clamping sleeve protrudes to form a limiting groove, and the limiting groove has a tapering structure with gradually decreasing width from front to back. The rib of the cross rib of the core rod 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 inclined side, 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 cooperates with the tapering structure of the limiting groove, so that the core rod is easily pulled out rearward relative to the clamping sleeve and is not easy to push forward. The clamping sleeve comprises a fixed clamping sleeve and a limiting clamping sleeve, the fixed clamping sleeve and the limiting clamping sleeve are in an arc-shaped half-and-half structure, the two ends of the fixed clamping sleeve and the limiting clamping sleeve are connected in cooperation through concave-convex structures, and the inner side of the middle part of the limiting clamping sleeve is provided with a limiting groove.

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