CN210785756U

CN210785756U - Syringe with anti-overflow function

Info

Publication number: CN210785756U
Application number: CN201920601911.8U
Authority: CN
Inventors: 顾丽雅; 韦锡娟; 其他发明人请求不公开姓名
Original assignee: Shanghai Pudong New Area Gongli Hospital (the Second Military Medical University Affiliated Gongli Hospital)
Current assignee: Shanghai Pudong New Area Gongli Hospital (the Second Military Medical University Affiliated Gongli Hospital)
Priority date: 2019-04-29
Filing date: 2019-04-29
Publication date: 2020-06-19
Anticipated expiration: 2029-04-29

Abstract

The utility model provides an injector with anti-overflow liquid function, through designing the cylinder of injector into ellipse circular, the piston is connected with the push rod rotation, the push rod is equipped with the silica gel strip corresponding to cylinder major axis footpath both ends, when wanting to fix the push rod position, through rotatory push rod to the direction that the internal diameter gradually diminishes for the silica gel strip compresses tightly on the inner wall of cylinder, can accomplish the locking of push rod, because the silica gel strip is arranged along the whole axial of push rod, can realize the locking of push rod optional position; when the liquid is fed again, the ribbed plate with the silica gel strip on the push rod rotates towards the direction in which the inner diameter gradually increases, the push rod can be loosened, the injector with the design is provided, the push rod is locked in position, the operation is simple and convenient, and the liquid can be effectively prevented from overflowing.

Description

Syringe with anti-overflow function

Technical Field

The utility model relates to a syringe, concretely relates to syringe with anti-overflow liquid function.

Background

The disposable syringe is widely applied to various departments of a hospital, and in clinical practice, when large-scale treatment is carried out, the working procedure is generally that after liquid medicine is pumped in a nursing room, the syringe is placed in a treatment disc, and then the treatment disc is pushed to the bedside of a patient to be operated. Usually, can place a plurality of syringes (of liquid medicine) in the treatment dish, and the syringe that uses at present does not have nook closing member locking device, the rocking of treatment dish, perhaps the nurse when taking the syringe with the collision of treatment dish side, perhaps operator's hand shake again, all can cause partial liquid medicine to leak from the syringe needle length, and then influence the accuracy of dosage of using medicine, especially to the patient that long-term injection treatment was used medicine, not only can seriously influence the treatment to the patient, still can interfere with the judgement of doctor to treatment.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an injector with anti-overflow liquid function can realize the locking of push rod at the optional position, and the continuous positioning of push rod avoids the loss beyond the liquid medicine promptly, guarantees the accuracy of dosage.

In order to achieve the above object, the present invention provides a syringe with anti-overflow function, comprising:

the cross section of the inner cavity of the needle cylinder is elliptical;

the cross section of the piston is in an elliptical shape matched with the inner cavity of the needle cylinder;

the push rod is provided with a first rib plate and a second rib plate which are symmetrically arranged, and the radial widths of the first rib plate and the second rib plate are greater than the length of a short axis of the cross section of the needle cylinder and less than or equal to the length of a long axis of the needle cylinder;

wherein, the top of the push rod is rotatably connected with the bottom of the piston to form that the push rod drives the piston to reciprocate in the needle cylinder.

Preferably, in the syringe with the anti-overflow function, a silicone strip is bonded to the outer end faces of the first rib plate and the second rib plate.

Preferably, in the syringe with the anti-overflow function, the piston comprises a hard inner core and a sealing outer sheath, the sealing outer sheath covers the outer side of the hard inner core, a rotary cavity is formed at the bottom of the hard inner core, a rotary connector is formed at the top of the push rod, and the rotary connector is matched with the rotary cavity.

Compared with the prior art, the beneficial effects of the utility model are that: the syringe of the injector is designed to be elliptical, the piston is rotationally connected with the push rod, the two ends of the push rod corresponding to the long shaft diameter of the syringe are provided with the silica gel strips, when the position of the push rod is to be fixed, the push rod is rotated in the direction that the inner diameter is gradually reduced, so that the silica gel strips are tightly pressed on the inner wall of the syringe, the locking of the push rod can be completed, and the silica gel strips are arranged along the whole axial direction of the push rod, so that the locking of any position of the push rod can be; when the liquid is fed again, the ribbed plate with the silica gel strip on the push rod rotates towards the direction in which the inner diameter gradually increases, the push rod can be loosened, the injector with the design is provided, the push rod is locked in position, the operation is simple and convenient, and the liquid can be effectively prevented from overflowing.

Drawings

FIG. 1 is a schematic view of the overall structure of the syringe;

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

FIG. 3 is a sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic view of the piston;

fig. 5 is a schematic view of the working principle of the push rod locking.

In the figure: 1-needle cylinder, 2-push rod, 21-first ribbed plate, 22-second ribbed plate, 23-third ribbed plate, 24-third ribbed plate, 25-rotary connector, 26-silica gel strip, 3-piston, 31-sealing sheath, 32-hard inner core and 33-rotary cavity.

Detailed Description

The syringe with anti-spill function of the present invention will now be described in greater detail with reference to the drawings, in which preferred embodiments of the invention are shown, it being understood that those skilled in the art may modify the invention herein described while still achieving the advantageous effects of the invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.

As shown in figure 1, the injector consists of three parts, namely a syringe 1, a push rod 2 and a piston 3. In this embodiment, the inner cavity of the syringe 1 and the cross section of the piston 3 are both elliptical, and the push rod 2 is rotatably mounted on the bottom of the piston 3, so that the piston 3 is driven by the push rod 2 to reciprocate in the syringe 1.

Referring to fig. 2 and 3, the push rod 2 has four ribs, the four ribs are distributed in a cross shape, namely a first rib 21, a second rib 22, a third rib 23 and a fourth rib 24, the first rib 21 and the second rib 22 are symmetrically arranged, the third rib 23 and the fourth rib 24 are symmetrically arranged, and the radial widths of the third rib 23 and the fourth rib 24 are in clearance fit with the short axis of the cross section of the inner cavity of the needle cylinder 1, so that the push rod 2 plays a role in guiding when reciprocating.

The radial width of the first rib 21 and the second rib 22 is larger than the length of the minor axis of the cross section of the inner cavity of the needle cylinder 1 and smaller than or equal to the length of the major axis of the cross section of the inner cavity of the needle cylinder 1. When the push rod 2 is rotated to enable the first rib plate 21 and the second rib plate 22 to rotate towards the direction that the inner diameter of the needle cylinder 1 is reduced, after the push rod 2 is rotated for a certain angle, the outer end faces of the first rib plate 21 and the second rib plate 22 are clamped on the inner wall of the needle cylinder 1, and the push rod 2 is fixed; when the push rod 2 is rotated so that the first rib 21 and the second rib 22 rotate in a direction in which the inner diameter of the cylinder 1 increases, the position of the push rod 2 can be unlocked.

The outer end faces of the first rib plate 21 and the second rib plate 22 opposite to the inner wall of the needle cylinder 1 are provided with elastic strips, and the elastic strips can increase the friction force between the rib plates and the wall face of the needle cylinder 1, so that the push rod position can be better locked. Specifically, the push rod 2 is made of high polymer polyethylene material, the elastic strip is made of a soft silica gel strip 26, and the silica gel strip 26 is bonded on the outer end face of the rib plate.

As shown in fig. 4, the piston 3 has a sealing sheath 31 and a hard inner core 32, the sealing sheath 31 can be made of plastic, rubber or other materials, and the sealing sheath 31 covers the outer side of the hard inner core 32 to form a seal between the piston 3 and the inner wall of the syringe 1 and prevent the liquid medicine from overflowing from the piston 3. The hard inner core 32 and the top end of the push rod 2 have a rotatable point, and the specific structure is shown in fig. 2 and fig. 4, a rotating cavity 33 is formed at the bottom of the hard inner core 32, a rotating connector 25 is formed at the top of the push rod 2, and the rotating connector 25 is matched with the rotating cavity 33, so that the push rod 2 can freely rotate relative to the piston 3. The fit clearance between the rotary cavity 33 and the rotary connector 25 can be designed and matched according to the actual tightness degree required by the rotation of the push rod 2 relative to the piston 3.

The use method and the working principle of the injector are as follows:

referring to fig. 3, when drawing the liquid medicine, the push rod 2 is rotated so that the outer end surfaces of the first rib 21 and the second rib 22 slightly abut or do not contact the inner wall of the cylinder 1, and it is understood that the third rib 23 and the fourth rib 24 are preferably in clearance fit with the inner wall of the cylinder 1 to guide the reciprocating motion of the push rod 2.

Because the section of the inner cavity of the needle cylinder 1 is oval, the inner diameter of the long axis of the section is the largest, and the inner diameters of the rest positions are smaller than the length of the long axis, after a predetermined amount of liquid medicine is extracted, the push rod 2 is rotated towards the direction that the inner diameter is reduced, at the moment, the piston 3 is fixed relative to the needle cylinder 1, the push rod 2 rotates relative to the piston 3, as shown by the dotted line in fig. 5, after the piston is rotated for a certain angle, the friction force between the silicon rubber strips 24 on the outer end faces of the first rib plate 21 and the second rib plate 22 and the inner wall of the needle cylinder 1 is increased after the silicon rubber strips are extruded.

Similarly, to unlock the plunger 2, the plunger 2 may be rotated in a reverse direction, that is, the plunger 2 is rotated in a direction in which the inner diameter is increased, so that the outer end surfaces of the first rib 21 and the second rib 22 are separated from the inner wall of the cylinder 1, and the locked state of the plunger 2 is released.

The above description is only for the preferred embodiment of the present invention, and does not limit the present invention. Any technical personnel who belongs to the technical field, in the scope that does not deviate from the technical scheme of the utility model, to the technical scheme and the technical content that the utility model discloses expose do the change such as the equivalent replacement of any form or modification, all belong to the content that does not break away from the technical scheme of the utility model, still belong to within the scope of protection of the utility model.

Claims

1. A syringe with an anti-spill function, comprising:

the cross section of an inner cavity of the needle cylinder (1) is elliptic;

the cross section of the piston (3) is elliptical and is matched with the inner cavity of the needle cylinder (1);

the push rod (2) is provided with a first rib plate (21) and a second rib plate (22), the first rib plate (21) and the second rib plate (22) are symmetrically arranged, and the radial width of the first rib plate (21) and the second rib plate (22) is greater than the length of a short axis of the cross section of the needle cylinder (1) and is less than or equal to the length of a long axis of the needle cylinder (1);

the top of the push rod (2) is rotatably connected with the bottom of the piston (3) to form that the push rod (2) drives the piston to reciprocate in the needle cylinder (1).

2. The syringe with the anti-overflow function according to claim 1, characterized in that a silicone strip (26) is bonded to the outer end faces of the first rib (21) and the second rib (22).

3. The syringe with the function of preventing the overflowing liquid according to claim 1, wherein the piston (3) comprises a hard inner core (32) and a sealing outer sheath (31), the sealing outer sheath (31) covers the outer side of the hard inner core (32), a rotating cavity (33) is formed at the bottom of the hard inner core (32), a rotating connector (25) is formed at the top of the push rod (2), and the rotating connector (25) is matched with the rotating cavity (33).