CN2836823Y

CN2836823Y - A safety medical syringe capable of retracting needle slowly and automatically

Info

Publication number: CN2836823Y
Application number: CN 200520015535
Authority: CN
Inventors: 林作钱
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-10-13
Filing date: 2005-10-13
Publication date: 2006-11-15
Anticipated expiration: 2015-10-13

Abstract

The utility model discloses a safety medical syringe capable of retracting a needle head slowly and automatically, which comprises a hollow needle cylinder, a core rod arranged in the needle cylinder and a rubber plug arranged on the front part of the core rod, wherein the front end of the needle cylinder is provided with an interchangeable needle seat and a protective sleeve arranged on the outer side of the interchangeable needle seat. The utility model is characterized in that the interchangeable needle seat comprises a connecting seat, a needle seat, a spring, a thrust sleeve and an O-shaped ring. The core rod comprises a small rubber plug, a slow retracting bracket, a retreat stopping ring, a push tube and a push rod. The utility model overcomes the defect that the needle of the existing safety self-destroying syringe needs being pulled by hand, a needle head of the utility model can be slowly retracted in the core rod after the use of injection is finished and injection needles with various standards can be interchanged. The utility model has the characteristics of convenient use and high safety.

Description

A kind of safe medical syringe with needle capable of automatically retracting

Technical field

This utility model relates to a kind of injector for medical purpose, the safe medical syringe that especially a kind of syringe needle can bounce back at a slow speed automatically.

Background technology

Facts have proved of modern medicine, for avoiding to the input of the mankind or animal or cross infection takes place when taking out medium, hypodermic syringe must disposable use, is using later promptly as garbage disposal.Using at present maximum disposable syringes is one by the cavity syringe, syringe needle and the journey piston of deciding that is fitted in the syringe are formed, the existing greatest problem of this syringe is after injection finishes, its syringe needle still is trapped in the outside, sharp-pointed degree with respect to syringe needle, it not only is the carrying of syringe rubbish, destroying makes troubles, often take place because of the thing of stabbing the medical and nursing work personnel accidentally simultaneously, this the secondary cross infection of pathogenic bacteria just inevitably can occur, particularly be used to suffer from serious infectious disease (as acquired immune deficiency syndrome (AIDS) for those, hepatitis, SARS etc.) syringe of patient's use, the medical hidden danger that can not ignore especially, practice shows, the damage that the needle stick injuries that dangerous needle set causes obviously causes more than other accidents.

In recent years, along with it is found that disposable syringe do not had good people reclaim use repeatedly after, in having proposed self-destruction syringe at the end of last century, self-destruction syringe can destroy voluntarily after it uses or be locked and can not reuse.But some present syringes all have an important disadvantages, and that is exactly that the nurse will manually pull out pin after injection finishes, thereby the complexity that the injection manipulation that makes becomes makes troubles for medical worker's use; A kind of syringe needle is also arranged with the automatic retractable syringe of spring, but when injection finishes, moment retraction speed too fast, blood is sprayed in the acupuncture treatment hole by human body instinct pressure, causes the secondary cross infection.

The utility model content

The purpose of this utility model is to provide a kind of syringe needle to bounce back automatically at a slow speed, pulls out pin without the doctor, uses the back syringe needle to conceal automatically and is unlikely to expose the injector for medical purpose of hurting sb.'s feelings.

For achieving the above object, this utility model is by the following technical solutions:

A kind of safe medical syringe with needle capable of automatically retracting comprises a hollow barrel; One is installed in the core bar in the described syringe, be installed in the forward plug of core bar, described syringe front end is installed an interchangeable needle stand, reaches one and is installed in the sheath that exchanges the needle stand outside, and it is characterized in that: described exchange needle stand comprises Connection Block, needle stand, spring, thrust sleeve and " O " type circle; Described core bar comprises little plug, low-speed retraction support, Non-return ring, ejector sleeve and push rod.

The inner portion of above-mentioned Connection Block is set up the elasticity support claw, its upper surface engages with the middle part boss face of needle stand, the following conical surface cooperates with the scalene cone of thrust sleeve, the reinforcement that the outside of Connection Block is provided with more than many is meshed with the inboard reinforcement of sheath, and its bottom outside sets up a base cone face and a symmetrical conical surface boss to fit with the head base cone face of syringe respectively and the head female thread is rotatably connected.

A boss face is set up in above-mentioned needle stand middle and upper part, itself and Connection Block head endoporus top butt; The lower surface butt of an end face and spring is set up in the needle stand bottom, and the bottom sets up the upper surface of an interior concave spherical surface and plug to match, and its middle part endoporus is set up a stifled pin, leaves one on stifled the pin and can make the smooth and easy sulculus that passes through of liquid.

Its inner portion of above-mentioned thrust sleeve is set up the upper surface butt of a top end face and spring, its bottom face and " O " type circle butt.

The head of above-mentioned little plug is spherical and sets up a groove, and its spherical head cooperates with the interior concave spherical surface of needle stand, and little plug bottom sets up the inner groovy of a flange and ejector sleeve head to mesh.

Above-mentioned ejector sleeve is a hollow pipe, and the endoporus of ejector sleeve is provided with the coarse pitch double thread, and the external diameter of the aperture of its inwall and low-speed retraction support is moving joins.

The outer wall middle and upper part of above-mentioned ejector sleeve is provided with many reinforcements, the convex circle that its outside and syringe bottom are provided with movingly, its top sets up the bottom face butt of top end face and plug.

The top of above-mentioned low-speed retraction support sets up a cylinder to cooperate with the endoporus of plug, fits in the endoporus top of top end face and plug.Its bottom side symmetry sets up two convex cylindrical and cooperates with the coarse pitch double thread rotation of described ejector sleeve.

Above-mentioned push rod head symmetrical molding has two barbs, and the middle part forms boss and boss face, and wherein boss matches with the inner convex platform of ejector sleeve when the syringe drawing liquid, and boss face is when pushing away liquid and the bottom face butt of described ejector sleeve.

Adopt above structure, but the syringe needle low-speed retraction is in core bar when injection use to finish for this utility model, and interchangeable all size entry needle has characteristics easy to use, safe.

Description of drawings

Fig. 1, planar structure cutaway view of the present utility model;

The local enlarged diagram of Fig. 2, Fig. 1 of the present utility model;

The planar structure cutaway view of Fig. 3, this utility model Connection Block;

The planar structure cutaway view of Fig. 4, this utility model needle stand;

The planar structure cutaway view of Fig. 5, this utility model thrust sleeve;

The planar structure cutaway view of Fig. 6, the little plug of this utility model;

The planar structure cutaway view of Fig. 7, this utility model low-speed retraction support;

The planar structure cutaway view of Fig. 8, this utility model ejector sleeve;

The planar structure cutaway view of Fig. 9, this utility model push rod;

The planar structure cutaway view of Figure 10, this utility model syringe;

State cutaway view before Figure 11, this utility model drawing liquid;

The finish cutaway view of state of Figure 12, this utility model drawing liquid;

Figure 13, this utility model push away the cutaway view of liquid first step state;

Figure 14, this utility model push away the cutaway view of second step of liquid state;

Figure 15, this utility model push away the cutaway view that liquid finishes.

The specific embodiment:

A kind of safe medical syringe with needle capable of automatically retracting shown in Fig. 1,2 and 10 comprises a hollow barrel 1; One is installed in the core bar 2 in the described syringe 1, be installed in core bar 2 forward plugs 3, described syringe 1 front end is installed an interchangeable needle stand 4, reach one and be installed in the sheath 5 that exchanges needle stand 4 outsides, described exchange needle stand 4 comprises Connection Block 41, needle stand 42, spring 43, thrust sleeve 44 and " O " type circle 45; Described core bar 2 comprises little plug 6, low-speed retraction support 7, Non-return ring 21, ejector sleeve 22 and push rod 23.

Shown in Fig. 3,4 and 5, the inner portion of Connection Block 41 is set up elasticity support claw 411, its upper surface 412 engages with the middle part boss face 421 of needle stand 41, the following conical surface 410 cooperates with the scalene cone 441 of thrust sleeve 44, the outside of Connection Block 41 is provided with many reinforcements 413, and it is meshed with the inboard reinforcement of sheath 5; Connection Block 41 bottom outside set up a base cone face 415 and a symmetrical conical surface boss 414 to fit with the base cone face 11 of syringe 1 head setting respectively and head female thread 12 is rotatably connected, and play sealing function.

As shown in Figure 4, a boss face 425 is set up in needle stand 42 middle and upper parts, itself and Connection Block 41 head endoporus tops 416 butts; The lower surface butt of an end face 424 and spring 43 is set up in needle stand 42 bottoms, and the bottom sets up that the upper surface of concave spherical surface 422 and plug 6 matches in one, and needle stand 42 middle part endoporus are set up a stifled pin 423, leave one on the stifled pin 423 and can make the smooth and easy sulculus that passes through of liquid.

As shown in Figure 5, thrust sleeve 44 inner portion are set up the upper surface butt of a top end face 442 and spring, its bottom face 443 and O type circle butt.

The head of little plug 6 as shown in Figure 6 is spherical and sets up a groove 64, and its spherical head cooperates with the interior concave spherical surface 422 of needle stand 42, and inner groovy 225 engagements of a flange 62 and ejector sleeve head are set up in little plug 6 bottoms.

Shown in Fig. 2 and 8, ejector sleeve 22 is a hollow pipe, and the endoporus of ejector sleeve 22 is provided with coarse pitch double thread 222,71 moving the joining of external diameter of the aperture of its inwall and low-speed retraction support 7.7 on low-speed retraction support blocks little plug 6 and needle stand 42 under the promotion of spring 43 after injection finishes, and returns ejector sleeve 22 bottoms at a slow speed reposefully along the rotation of ejector sleeve 22 female threads.The base flange 62 that ejector sleeve 22 inner portion set up inner groovy 225 and described little plug 6 fits tightly, the inner convex platform that the ejector sleeve 22 heads outside sets up outer groove 223 and Non-return ring 21 fits tightly, the inwall interference fit of the outer lug boss of Non-return ring 21 and plug 3 can prevent that plug 3 comes off when drawing liquid from core bar 2.The outer wall middle and upper part of ejector sleeve 22 is provided with many reinforcements 221, the convex circle 13 that its outside and syringe 1 bottom are provided with movingly, reinforcement 221 tops set up the bottom face butt of top end face 226 and plug 3, have guaranteed that core bar 2 can not wave and rock at drawing liquid with when pushing away liquid.Ejector sleeve 22 promotes " O " type circle 45 in needle stand 42 outsides and promotes thrust sleeve 44 when injection finishes, and makes needle stand 42 lose support force, and promotion needle stand 42 reaches retraction function under the effect of compression spring 43 restoring forces.

As shown in Figure 7, the top of low-speed retraction support 7 sets up a cylinder 74 to cooperate with the endoporus 61 of little plug 6, cylinder 74 top end faces 73 are fitted with the endoporus top 63 of little plug 6, and low-speed retraction support 7 bottom side symmetries set up two convex cylindrical 72 and cooperate with coarse pitch double thread 222 rotations of described ejector sleeve.

As shown in Figure 9, push rod 23 head symmetrical molding have two barbs 232, can be blocked in the needle stand 42 of rollback in the core bar 2, prevent to hurt sb.'s feelings.The middle part forms boss 231 and boss face 234, and wherein boss 231 matches with the inner convex platform 227 of ejector sleeve when the syringe drawing liquid, and boss face 234 is when pushing away liquid and bottom face 228 butts of described ejector sleeve., have one section operating range to engage between the inner convex platform 227 of push rod boss 231 and ejector sleeve 22 here, push rod 23 just skids off a segment distance and makes things convenient for the drawing liquid operation when drawing liquid, pushes away when liquid finishes making the handle 233 of push rod 23 enter syringe 1 bottom, is difficult for pulling out.

Shown in Fig. 1,11,12,13,14 and 15, be the whole use overall process of this utility model, wherein Fig. 1 is the cutaway view of unused state, Figure 11 is for preparing the preceding cutaway view of drawing liquid, the cutaway view that Figure 12 finishes for drawing liquid, Figure 13 pushes away not on earth action diagram of liquid, and Figure 14 is the cutaway view that pushes away second step of liquid state; Figure 15 pushes away the action diagram that liquid finishes.When the top of little plug 6 is subjected to the bounce of needle stand 42 bottoms, force little plug 6 in ejector sleeve 22, to move, make little plug 6 break away from the groove 225 that matches with ejector sleeve 22; When the top 224 of ejector sleeve 22 promotes " O " type circle 45, promoting thrust sleeve 44 simultaneously moves upward, the bottom of needle stand 42 is broken away from from " O " type circle 45, elasticity support claw 410 is strutted to both sides break away from and the engaging of needle stand 42 middle part boss 421.At this moment compress spring 43 and promote needle stands 42, and promote little plug 6 and low-speed retraction support 7 moves in ejector sleeve 22, because of low-speed retraction support 7 is subjected to the restriction of screw thread rotation, so syringe needle returns to ejector sleeve 22 bottoms at a slow speed.

Above-mentioned several embodiment is only for the usefulness that this utility model is described, and be not to restriction of the present utility model, the those of ordinary skill in relevant technologies field, under the situation of the spirit and scope that do not break away from utility model, can also make various variations and modification, so all technical schemes that are equal to also belong to category of the present utility model.

Claims

1, a kind of safe medical syringe with needle capable of automatically retracting, comprise a hollow barrel (1), one is installed in the core bar (2) in the described syringe (1), be installed in the forward plug of core bar (2) (3), described syringe (1) front end is installed an interchangeable needle stand (4), reach one and be installed in the sheath (5) that exchanges needle stand (4) outside, it is characterized in that: described exchange needle stand (4) comprises Connection Block (41), needle stand (42), spring (43), thrust sleeve (44) and " O " type circle (45); Described core bar (2) comprises little plug (6), low-speed retraction support (7), Non-return ring (21), ejector sleeve (22) and push rod (23).

2, a kind of safe medical syringe with needle capable of automatically retracting as claimed in claim 1, it is characterized in that: the inner portion of described Connection Block (41) is set up elasticity support claw (411), its upper surface (412) engages with the middle part boss face (421) of needle stand, the following conical surface (410) cooperates with the scalene cone (441) of thrust sleeve (44), the outside of Connection Block is provided with many reinforcements (413) and is meshed with the inboard reinforcement of sheath (5), and the Connection Block bottom outside sets up a base cone face (415) and a symmetrical conical surface boss (414) to fit with the head base cone face (11) of syringe (1) respectively and head female thread (12) is rotatably connected.

3, a kind of safe medical syringe with needle capable of automatically retracting as claimed in claim 1 or 2 is characterized in that: a boss face (425) is set up in described needle stand (42) middle and upper part, itself and Connection Block (41) head endoporus top (416) butt; The lower surface butt of an end face (424) and spring (43) is set up in needle stand (42) bottom, needle stand (42) bottom sets up an interior concave spherical surface (422) and the upper surface of plug (6) to match, its middle part endoporus is set up a stifled pin (423), leaves one on the stifled pin and can make the smooth and easy sulculus that passes through of liquid.

4, a kind of safe medical syringe with needle capable of automatically retracting as claimed in claim 1 or 2, it is characterized in that: its inner portion of described thrust sleeve (44) is set up the upper surface butt of a top end face (442) and spring, its bottom face (443) and " O " type circle butt.

5, a kind of safe medical syringe with needle capable of automatically retracting as claimed in claim 1, it is characterized in that: the head of described little plug (6) is spherical and sets up a groove (64), its spherical head cooperates with the interior concave spherical surface (422) of needle stand (42), and little plug (6) bottom sets up a flange (62) and the inner groovy (225) of ejector sleeve head to mesh.

6, a kind of safe medical syringe with needle capable of automatically retracting as claimed in claim 1, it is characterized in that: described ejector sleeve (22) is a hollow pipe, the endoporus of ejector sleeve is provided with coarse pitch double thread (222), and the external diameter (71) of the aperture of its inwall and low-speed retraction support (7) is moving joins; The outer wall middle and upper part of ejector sleeve (22) is provided with many reinforcements (221), the convex circle (13) that its outside and syringe (1) bottom are provided with movingly, reinforcement (221) top sets up the bottom face butt of top end face (226) and plug (3).

7, as claim 1,5 or 6 described a kind of safe medical syringe with needle capable of automatically retracting, it is characterized in that: the top of described low-speed retraction support (7) sets up a cylinder (74) to cooperate with the endoporus (61) of plug (6), top end face (73) is fitted with the endoporus top (63) of plug, and its bottom side symmetry sets up two convex cylindrical (72) and cooperates with coarse pitch double thread (222) rotation of described ejector sleeve.8, as claim 1 or 6 described a kind of safe medical syringe with needle capable of automatically retracting, it is characterized in that: described push rod (23) head symmetrical molding has two barbs (232), the middle part forms boss (231) and boss face (234), wherein boss (231) matches with the inner convex platform (227) of ejector sleeve when the syringe drawing liquid, and boss face (234) is when pushing away liquid and the bottom face of described ejector sleeve (228) butt.