CN210844703U

CN210844703U - Syringe with retractable needle

Info

Publication number: CN210844703U
Application number: CN201921303164.6U
Authority: CN
Inventors: 刘红彦
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-13
Filing date: 2019-08-13
Publication date: 2020-06-26
Anticipated expiration: 2029-08-13

Abstract

The utility model provides a syringe that syringe needle can be withdrawed, include: the syringe, the liquid outlet end of the syringe has a front guide cavity whose cross section is smaller than the syringe, there is a movable syringe needle in the front guide cavity, the needle tip of the syringe needle can extend out from the opening of the end of the front guide cavity, the pintle of the syringe needle is located in the front guide cavity, the needle stem of the syringe needle is covered with a spring, one end of the spring is against the end wall of the end of the front guide cavity, the other end is against the pintle, there is a removable limit shrapnel on the pintle moving channel in the retraction process of the syringe needle into the front guide cavity; the needle cylinder is internally provided with a first piston matched with the inner wall of the needle cylinder and a second piston capable of entering the front guide cavity to remove the limiting elastic sheet, and the first piston and the second piston are respectively connected with a first piston rod and a second piston rod. The utility model has the characteristics of simple structure, convenient operation, safe practical, when the control syringe needle was withdrawed, operator's hand was in the safety range who keeps away from the syringe needle all the time, had greatly reduced the possibility of being stabbed by the syringe needle.

Description

Syringe with retractable needle

Technical Field

The utility model belongs to the technical field of the medical appliances technique and specifically relates to a syringe that syringe needle can be withdrawed to the cylinder.

Background

The syringe is used for extracting liquid medicine by using a needle head on the syringe and then injecting the liquid medicine into a patient. However, the used syringe needle may be contaminated with medical fluids and patient blood, and in case of an accident (e.g. a restless patient, a patient not being treated) or improper handling by a medical staff, it may happen that the needle scratches the medical staff or other persons may cause an injury, which is generally called "needle stick injury". If the unfortunate patient has an infectious disease, the injury is greater.

In order to avoid the occurrence of 'needle-stick injury', the needle head is matched with a protective cap, and the protective cap is covered on the needle head after the injection is finished, so that accidents are prevented. However, during operation with the shield on the needle, the operator is also susceptible to needle stick injuries.

Therefore, how to avoid the occurrence of "needle stick injuries" in used syringes is the focus of research by those skilled in the art.

The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a syringe needle can withdraw disposable syringe in the cylinder to the syringe needle of the syringe needle stabs people's technical problem easily after the use that exists among the solution prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a syringe with a retractable needle, the syringe comprising: the liquid outlet end of the needle cylinder is provided with a front guide cavity with a cross section smaller than that of the needle cylinder, a movable needle head is arranged in the front guide cavity, the needle tip part of the needle head can extend out of an opening at the tail end of the front guide cavity, a pintle part of the needle head is positioned in the front guide cavity, a spring is sleeved at the needle stem part of the needle head, one end of the spring is abutted against the end wall at the tail end of the front guide cavity, the other end of the spring is abutted against the pintle part, and a removable limiting elastic sheet is arranged on a pintle part moving channel in the process of retracting the needle head into the front guide cavity;

the needle cylinder is internally provided with a first piston matched with the inner wall of the needle cylinder and a second piston capable of entering the front guide cavity to remove the limiting elastic sheet, and the first piston and the second piston are respectively connected with a first piston rod and a second piston rod.

Further, the first piston rod is cylindrical, and the second piston rod is inserted into the first piston rod and is longer than the first piston rod.

Further, the first piston rod and the second piston rod are provided with piston handles protruding in the radial direction.

Furthermore, the limiting elastic sheet is in an inverted L shape, the limiting elastic sheet inclines towards the front guide cavity from top to bottom, the upper end of the limiting elastic sheet is fixed on the side wall of the front guide cavity, and the lower end of the limiting elastic sheet extends out of and blocks the upward moving channel of the needle bolt portion.

Furthermore, the upper end of the limiting elastic sheet is provided with a bent fixing part, and the fixing part is fixed on the outer side of the side wall of the front guide cavity through a screw.

Further, the first piston is provided with a groove for accommodating the second piston, and the second piston forms a part of the first piston.

Furthermore, one side of the front guide cavity is provided with a side cavity used for hiding the limiting elastic sheet, and the side wall of the front guide cavity is provided with a strip-shaped opening through which the limiting elastic sheet enters the side cavity from the front guide cavity.

Further, the length of the leading cavity is greater than the length of the needle.

Furthermore, a finger grip part is arranged on the side wall of the needle cylinder.

When the medical syringe is used, the needle head is located in an initial state, namely the needle head extends out from an opening at the tail end of the front guide cavity, the first piston rod is pulled, liquid medicine is sucked into the syringe from the needle head, after the injection part of a patient is pierced, the first piston rod is pushed to inject the liquid medicine into the patient, the second piston rod is pushed, the second piston head enters the front guide cavity, the limiting elastic piece is pushed to be removed from an upward moving channel of the needle bolt part, the needle head rebounds under the action of the spring and enters the front guide cavity, the second piston rod is pulled to reset the limiting elastic piece, the limiting elastic piece blocks on a downward moving channel of the needle head, the needle head is kept in the front guide cavity by matching with the spring.

Adopt above-mentioned technical scheme, the utility model discloses following beneficial effect has:

the utility model provides a syringe that syringe needle can be withdrawed uses the back at the syringe, and the operator can withdraw the syringe needle before the pilot chamber under the prerequisite of contactless syringe needle, and can not expose suddenly at medical waste transfer in-process syringe needle, avoids the emergence of acupuncture injury incident.

The first piston rod is arranged in a cylindrical shape, so that the problem of interference with the second piston rod during action can be avoided;

the piston handle is convenient for an operator to operate the first piston rod and the second piston rod;

the elastic deformation of the limiting elastic sheet is utilized to limit the rebound of the needle head, and the needle head can be blocked on a path where the needle head extends out after rebounding, so that the needle head is prevented from accidentally sliding out of the front guide cavity; the inverted L-shaped limiting elastic sheet enables the second piston to remove the limiting elastic sheet when contacting the upper end area of the limiting elastic sheet, and enough space is reserved for the action of withdrawing the needle head into the front guide cavity, so that the arrangement length of the front guide cavity is shortened, and the amount of liquid medicine reserved in the front guide cavity is reduced;

the connection mode of the limiting elastic sheet and the front guide cavity ensures that the limiting elastic sheet is more firmly fixed;

the second piston can form a part of the first piston, so that the first piston can push the liquid medicine more smoothly, the residual quantity of the liquid medicine in the needle cylinder is reduced, and waste is reduced;

the side cavity provides space for the action of the limiting elastic sheet;

the finger grip part is convenient for the injection operation of an operator.

The utility model discloses still have simple structure, convenient operation, when the control syringe needle was withdrawed, operator's hand was in the safety range who keeps away from the syringe needle all the time, had greatly reduced the possibility of being stabbed by the syringe needle.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is one of the schematic views of a syringe with a retractable needle according to an embodiment of the present invention;

fig. 2 is a second schematic view of a syringe with a retractable needle according to an embodiment of the present invention;

FIG. 3 is an enlarged view of area A of FIG. 2;

FIG. 4 is an enlarged view of area B of FIG. 2;

fig. 5 is a third schematic view of a syringe with a retractable needle according to an embodiment of the present invention;

FIG. 6 is an enlarged view of area C of FIG. 5;

icon: 1-a needle cylinder; 2-finger grip; 3-a first piston rod; 4-a piston shank; 5-a piston handle; 6-a second piston rod; 7-a first piston; 8-a second piston; 9-a leading cavity; 10-a limit elastic sheet; 11-a pintle section; 12-a spring; 13-a needle head; 14-needle tip; 15-opening; 16-bar-shaped opening; 17-side cavity; 18-a fixation section; 19-a screw; 20-needle peduncle part; 21-groove.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

Fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6 show an embodiment of a syringe with a retractable needle according to the present invention, the syringe in this embodiment specifically includes: a front guide cavity 9 with a cross section smaller than that of the needle cylinder 1 is arranged at the liquid outlet end (the lower end of the needle cylinder 1 in figure 1) of the needle cylinder 1, a movable needle 13 is arranged in the front guide cavity 9, and the length of the front guide cavity 9 is larger than that of the needle 13. The needle 13 comprises a pintle part 11, a needle stem part 20 and a needle tip part 14, and a liquid guide channel passes from the pintle part 11 to the needle tip part 14 through the needle stem part 20. The needle tip part 14 of the needle head 13 can extend out from an opening 15 at the tail end of the front guide cavity 9 and is exposed outside the injector, the needle bolt part 11 of the needle head 13 is positioned in the front guide cavity 9, the needle stem part 20 of the needle head 13 is sleeved with the spring 12, one end of the spring 12 is propped against the end wall at the tail end of the front guide cavity 9, the other end of the spring 12 is propped against the needle bolt part 11, and a removable limiting elastic sheet 10 is arranged on a moving channel of the needle bolt part 11 in the process of retracting the needle head 13 into the front guide cavity 9;

a first piston 7 matched with the inner wall of the needle cylinder 1 and a second piston 8 capable of entering the front guide cavity 9 to remove the limiting elastic sheet 10 are arranged in the needle cylinder 1, and a first piston rod 3 and a second piston rod 6 are connected to the first piston 7 and the second piston 8 respectively.

When the syringe is used, the needle 13 is in an initial state (refer to fig. 1), namely, the needle 13 extends out from the opening 15 at the tail end of the front guide cavity 9, the first piston rod 3 is drawn, the liquid medicine is sucked into the syringe 1 from the needle 13, after the needle 13 penetrates into the subcutaneous skin of a patient, the first piston rod 3 is pushed to inject the liquid medicine into the patient (refer to fig. 2), the second piston rod 6 is pushed, the second piston head 8 enters the front guide cavity 9, the limiting elastic sheet 10 is pushed to be removed from the upward moving channel of the needle bolt part 11, the needle 13 is ejected into the front guide cavity 9 under the action of the spring 12 (refer to fig. 5), the second piston rod 6 is drawn to reset the limiting elastic sheet 10, the limiting elastic sheet 10 is blocked on the downward moving channel of the needle 13, the needle 13 is retained in the front guide cavity 9 by matching with the spring 12, and the syringe.

The syringe that the syringe needle provided in this embodiment can be withdrawed after the syringe uses, and the operator can withdraw leading intracavity 9 with syringe needle 13 under the prerequisite of contactless syringe needle 13, and can not expose suddenly at medical waste transfer in-process syringe needle 13, avoids the emergence of acupuncture injury incident.

In another more preferred aspect, the first piston rod 3 is cylindrical, and the second piston rod 6 is inserted into the first piston rod 3, and the second piston rod 6 is longer than the first piston rod 3. The first piston rod 3 is provided in a cylindrical shape, and thus, the problem of interference with the second piston rod 6 during operation can be avoided.

In another preferred embodiment, the first piston rod 3 and the second piston rod 6 are provided with radially projecting piston shanks 4, 5. The piston shanks 4, 5 facilitate the operation of the first and

second piston rods

3, 6 by the operator.

In another more preferred scheme, the limiting elastic sheet 10 is in an inverted L shape, the limiting elastic sheet 10 is inclined from top to bottom into the front guide cavity 9, the upper end of the limiting elastic sheet 10 is fixed on the side wall of the front guide cavity 9, and the lower end of the limiting elastic sheet 10 extends out and blocks the upward moving channel of the pintle part 11. The elastic deformation of the limiting elastic sheet 10 is utilized to realize the rebound limitation of the needle 13, and the needle 13 can be blocked on the path extending out of the needle 13 after rebounding, so that the needle 13 is prevented from accidentally sliding out of the front guide cavity 9; the inverted L-shaped limiting elastic sheet 10 enables the second piston 8 to remove the limiting elastic sheet 10 when contacting the upper end area of the limiting elastic sheet 10, and enough space is reserved for the action of withdrawing the needle 13 into the front guide cavity 9, so that the setting length of the front guide cavity 9 is shortened, and the amount of liquid medicine retained in the front guide cavity 9 is reduced.

In another more preferable scheme, the upper end of the limiting elastic sheet 10 is provided with a bent fixing part 18, and the fixing part 18 is fixed outside the side wall of the front guide cavity 9 through a screw 19. The connection mode of the limiting elastic sheet 10 and the front guide cavity 9 enables the limiting elastic sheet 10 to be fixed more firmly.

In another more preferred solution, the first piston 7 is provided with a recess 21 for receiving the second piston 8, the second piston 8 forming part of the first piston 7. The second piston 8 can form a part of the first piston 7, so that the first piston 7 can push the liquid medicine more smoothly, the residual quantity of the liquid medicine in the needle cylinder is reduced, and waste is reduced.

In another more preferable scheme, a side cavity 17 for hiding the limiting elastic sheet 10 is arranged at one side of the front guide cavity 9, and a strip-shaped opening 16 for allowing the limiting elastic sheet 10 to enter the side cavity 17 from the front guide cavity 9 is arranged on the side wall of the front guide cavity 9. The side cavity 17 provides space for the action of the limit spring 10.

In another more preferred version, the needle cylinder 1 is provided with finger grips 2 on its lateral wall. The finger grip 2 facilitates various injection operations for the operator.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A syringe having a retractable needle, the syringe comprising: the liquid outlet end of the needle cylinder is provided with a front guide cavity with a cross section smaller than that of the needle cylinder, a movable needle head is arranged in the front guide cavity, the needle tip part of the needle head can extend out of an opening at the tail end of the front guide cavity, a pintle part of the needle head is positioned in the front guide cavity, a spring is sleeved at the needle stem part of the needle head, one end of the spring is abutted against the end wall at the tail end of the front guide cavity, the other end of the spring is abutted against the pintle part, and a removable limiting elastic sheet is arranged on a pintle part moving channel in the process of retracting the needle head into the front guide cavity;

2. The syringe of claim 1 wherein the first plunger rod is cylindrical and the second plunger rod is inserted within the first plunger rod, the second plunger rod being longer than the first plunger rod.

3. The syringe of claim 2 wherein said first plunger rod and said second plunger rod are provided with radially projecting plunger stems.

4. The syringe of claim 1, wherein the limiting elastic sheet is in an inverted L shape, the limiting elastic sheet inclines towards the front guide cavity from top to bottom, the upper end of the limiting elastic sheet is fixed on the side wall of the front guide cavity, and the lower end of the limiting elastic sheet extends out and blocks on the upward moving channel of the needle plug part.

5. The syringe as claimed in claim 4, wherein the upper end of the limiting elastic sheet is provided with a bent fixing part, and the fixing part is fixed outside the side wall of the front guide cavity through a screw.

6. The syringe of claim 1 wherein the first piston is provided with a recess for receiving the second piston, the second piston forming part of the first piston.

7. The syringe as claimed in claim 5, wherein a side cavity for hiding the stopper spring is formed at one side of the front cavity, and a bar-shaped opening for allowing the stopper spring to enter the side cavity from the front cavity is formed at a side wall of the front cavity.

8. The syringe of claim 1 wherein the length of the forward lumen is greater than the length of the needle.

9. The syringe of claim 1 wherein said barrel is provided with finger grips on a sidewall thereof.