CN201168290Y

CN201168290Y - Safety syringe with retractable injection needle

Info

Publication number: CN201168290Y
Application number: CNU200820107974XU
Authority: CN
Inventors: 张淑茗
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-03-28
Filing date: 2008-03-28
Publication date: 2008-12-24
Anticipated expiration: 2018-03-28

Abstract

The utility model relates to an injection pin retracting safe injector, in particular to an injector, the injection pin of which can retract to a cylinder after the injection pin finishes injection. The injector is mainly characterized in that a first clamping leg and a second clamping leg which are unsymmetrical are respectively arranged at the two sides at the front end of the elastic clamping part of the push rod; wherein, a depression part is formed at the preset position of the outer side of the first clamping leg; besides, when the elastic clamping part of the push rod is clamped into the buckling slot of a neilsbed, the two outer sides of the elastic clamping part generate tension and is pressed on the inner wall of the buckling slot of the neilsbed in a forcing way; the injection pin of the utility model can not reveal to the outside to stab the medical and cleaning personnel by the special design; besides, the injection pin retracting safe injector is provided with the self destroying function of secondary protection which can be completely recycled and destroyed by a user after used for only once, thus avoiding secondary pollution caused by reusage.

Description

Injection needle restoring formula safety injector

Technical field

This utility model relates to a kind of injection needle restoring formula safety injector, and especially a kind of entry needle can bounce back to the intravital syringe of tube after injection finishes.

Background technology

Syringe major part in the market is all traditional type, comprises that entry needle all is not have any safety device, not only can reuse, and cause medicine and blood contamination easily, add the exposed of entry needle, more cause stabbing of medical personnel and cleanup crew, deepen the popular of infectious disease; Then there is the inventor to develop a syringe by this, its syringe construction sees also No. the 91132968th, Taiwan patent gazette disclosed " withdrawn needle type syringe " (as shown in Figure 1), its characteristic mainly is: its inner chamber is inserted with the syringe (1) of plunger, be installed on the needle stand (4) of syringe (1) leading section, be installed on needle stand (4) inner chamber and the lining of distolateral disengaging backwards (5) only, and rearward end is installed in the entry needle (6) of lining (5) leading section, according to plunger body (2) being moved to syringe (1) leading section, the pulling back of engaging foot (7) of lining (5) engaged with the holding section (3) of plunger body (2) with projection (8), can see through plunger body (2) draws in entry needle (6) in the syringe (1), according to the inserted structure that is formed between lining (5) leading section outer peripheral face and needle stand (4) leading section inner cavity surface, make lining (5) remain in needle stand (4), and lining (5) is under the chimerism with respect to the side foremost of needle stand (4), lining (5) hold before axially be positioned at needle stand (4) hold before near or be positioned at than its position in the place ahead more;

This known structure kenel finds still to exist following problem points in actual use experience:

The engaging foot (7) of this lining (5) is to be two sides symmetry kenel, when engaging with the holding section of plunger body (2) with projection (8), pulling back of engaging foot (7) finish, and plunger body (2) is when the inner retraction of syringe (1), its entry needle (6) only bounces back to syringe (1) inside for parallel shape, if inwardly during the inner plunger body (2) of application of force pushing tow syringe (1), this entry needle (6) still has an opportunity to release outside the syringe (1), so that this injection tube stays a risk factor in security protection, also increase the chance that causes medical personnel's accidental puncture.

At the existing problem points of above-mentioned known safety injection barrel structure, how to develop a kind of injection tube innovation structure that has more two road protectives, the ardent hope of real use institute of consumer also is that relevant dealer's palpus is made great efforts target and the direction that research and development break through.

In view of this, the inventor is in manufacturing development and the design experiences of being engaged in Related product for many years, at above-mentioned target, in detail after design and the scrupulous assessment, eventually this utility model of a true tool practicality.

The utility model content

Main purpose of the present utility model provides a kind of injection needle restoring formula safety injector structural improvement.The technical problem that this utility model solves is that the engaging foot at the existing lining of known withdrawn needle type syringe is to be two sides symmetry kenel, when plunger body bounces back in syringe is inner, its entry needle only bounces back to syringe inside for parallel shape, if during the push rod of pushing tow syringe inside, this entry needle is still had an opportunity to release syringe exterior problem point and is improved breakthrough inwardly;

Injection needle restoring formula safety injector of the present utility model is made up of push rod, cylindrical shell and plug, wherein barrel front end is formed with spacing zone, this spacing zone axially is assembled with a needle stand and entry needle, the needle stand rear end is formed with buckling groove, and the buckling groove of the corresponding needle stand of push rod front end is extended with the elasticity holding section, the elasticity holding section of push rod cooperates the buckling groove of intercalation needle stand, and elasticity holding section front end offers inwardly and urges the space, the elasticity and elasticity holding section two sides contract in having is so that behind the buckling groove of intercalation needle stand and then closely block mutually; It is characterized in that: elasticity holding section front end two sides of this push rod are arranged with the asymmetric first engaging foot and the second engaging foot, wherein this first engaging outside of foot precalculated position is formed with depressed part, and when the elasticity holding section of this push rod snapped in the buckling groove of needle stand, two outsides of this elasticity holding section produced tension force and urge buckling groove inwall in needle stand; When push rod was embedded in needle stand and application of force retraction, the buckling groove inwall of this needle stand promptly strutted tension force according to first and second engaging foot elasticity, and when making needle stand and injection needle restoring to cylindrical shell, and it is crooked that this needle stand and entry needle promptly are beat towards the depressed part of the first engaging foot.

Its technical characterstic of dealing with problems of this utility model mainly is that elasticity holding section front end two sides according to this push rod are arranged with the asymmetric first engaging foot and the second engaging foot, wherein this first engaging outside of foot precalculated position is formed with depressed part, and when the elasticity holding section of this push rod snapped in the buckling groove of needle stand, two outsides of this elasticity holding section were to produce tension force and urge buckling groove inwall in needle stand;

Technique effect of the present utility model is to stab medical personnel and cleanup crew outside entry needle can't be exposed to, and the function of the self-destruction of tool two roads protection, reclaim fully after the user only can once use and destroy, cause the practical improvement of secondary pollution to avoid reusing.

Description of drawings

Fig. 1 is the assembled sectional view of known safe injection needle.

Fig. 2 is the action sketch map of this utility model safe injection needle, shows that the elasticity holding section of push rod is not embedded in the buckling groove state of needle stand.

Fig. 3 is the action sketch map of this utility model safe injection needle, shows the buckling groove state of the elasticity holding section preparation inlay card needle stand of push rod.

Fig. 4 is the action sketch map of this utility model safe injection needle, and the elasticity holding section of demonstration push rod is the buckling groove state of inlay card needle stand.

Fig. 5 is the action sketch map of this utility model safe injection needle, and when showing the push rod retraction, needle stand is the beat askew status in cylindrical shell, the fracture place that fractures of push rod of the user and the application of force.

Fig. 6 is second embodiment of the present utility model, shows that this needle stand is interchangeable pin kenel.

Fig. 7 is the 3rd embodiment of the present utility model, shows that this needle stand is another kenel of interchangeable pin.

Label is described

Known part:

Syringe (1) plunger body (2)

Holding section (3) needle stand (4)

Lining (5) entry needle (6)

Engaging foot (7) is pulled back with projection (8)

This utility model part:

Cylindrical shell (10) block face (11)

Spacing zone (12)

Push rod (20) plug (201)

Place (21) elasticity holding section (22) fractures

The first engaging foot (23) second engaging feet (24)

Stop section, stop section (25) (26)

Guiding incline (27) depressed part (28)

Urge space (29)

Needle stand (30) entry needle (31)

Buckling groove (32) protuberance (33)

O shape ring (34)

Needle stand (20B) O shape ring (21B)

Buckling groove (22B) protuberance (23B)

Entry needle socket (25B) entry needle (26B)

Admittedly lock screw thread (27B)

Needle stand (20D) O shape ring (21D)

Buckling groove (22D) protuberance (23D)

Entry needle socket (25D) entry needle (26D)

The specific embodiment

Below in conjunction with accompanying drawing to this utility model explanation that is elaborated.

Seeing also shown in the 2nd～4 figure, is the structure improved preferred embodiment of this utility model injection needle restoring formula safety injector, and embodiment only for explanation, is not subjected to the restriction of this structure in patent application.

At first, it is made up of this safety injector cylindrical shell (10), push rod (20) and plug (201), wherein:

One cylindrical shell (10), it is generally to be the hollow structure form, end is formed with the spacing zone (12) that inwardly contracts in the footpath before in this cylindrical shell (10), and this spacing zone (12) internal face is axially to be assembled with a needle stand (30), this needle stand is to be glutinous pin type needle stand form in present embodiment, wherein this needle stand (30) front end is provided with entry needle (31), the buckling groove (32) that provides elasticity holding section (22) inlay card to cooperate more is provided in the rear end, wherein the ora terminalis position of this buckling groove (32) is to convex with protuberance (33) inwardly, and the outer rim precalculated position inlay card of needle stand (30) has O shape ring (34), in order to airtight spacing zone (12) inwall that is packed in;

One push rod (20), this bar section section is generally to be the decussate texture form, and be formed with the place (21) that fractures in predetermined bar fragment position, the buckling groove (32) of the corresponding needle stand of this push rod (20) front end (30) is to be extended with elasticity holding section (22), this elasticity holding section (22) just can cooperate in the buckling groove (32) that is intercalated in needle stand (30), wherein this elasticity holding section (22) front end offers towards inside and urges space (29), make elasticity holding section (22) two sides be formed with the asymmetric first engaging foot (23) and the second engaging foot (24) respectively according to urging space (29), wherein this first, two engaging feet (23,24) end position respectively is formed with the guiding incline (27) of taper before, and each relative rearward position of guiding incline (27) is formed with stop section (25,26), and first, two engaging feet (23,24) dual side-edge has the suitable elasticity of compression inwardly because of urging space (29), when elasticity holding section (22) desire buckling groove (32) that intercalation group goes into needle stand (30) (as shown in Figure 3), this is first years old, two engaging feet (23,24) guiding incline (27) is then gone ahead of the rest slide guide in the protuberance (33) of buckling groove (32), when advancing first, two engaging feet (23,24) then towards urging space (29) internal compression, enter back first, two engaging feet (23,24) each stop section (25,26) each protuberance (33) that promptly is snapped in buckling groove (32) is relatively located, and reaches mutually closely buckling state (as shown in Figure 4) in order to do the buckling groove (32) that makes elasticity holding section (22) with needle stand (30);

And principal character of the present utility model is that this precalculated position, first engaging foot (23) outside is formed with depressed part (28), wherein this depressed part (28) is the recessed edge form of circular arc in present embodiment, and first and second engaging foot (23 of this push rod (20), 24) be embedded in the buckling groove (32) of needle stand (30) when interior, this first and second the engaging foot (23,24) guiding incline (27) outer rim is to produce predetermined tension, and urges buckling groove (32) inwall in needle stand (30) relatively;

By this, when push rod (20) inlay card is gone into needle stand (30) back and application of force retraction push rod (20) and needle stand (30), two lateral margins of this needle stand (30) then according to retraction effect leave the spacing zone (12) of cylindrical shell (10), needle stand (30) outer rim then is the free state that does not stress when needle stand (30) leaves spacing zone (12), then, and according to first, two engaging feet (23,24) the tension force effect that struts outwardly, and buckling groove (32) inwall of needle stand (30) is urged because of being subjected to tension force, so that needle stand (30) is the askew status of beat distortion in cylindrical shell (10), and the crooked direction of this needle stand (30) is to make one protuberance (33) end be resisted against depressed part (28) position of the first engaging foot (23), moreover, when push rod (20) when bouncing back to the limit, the entry needle (31) of this needle stand (30) promptly is crooked shape and hides and to be placed in the cylindrical shell (10), and according to the contraction block face (11) of cylindrical shell (10) one ends with block entry needle (31) end can't be pushed into outside the cylindrical shell (10), this is the first road security protection, person more, user is the fracture place (21) that fractures of push rod (20) of the application of force again, make push rod (20) reuse, this is second road protection (as shown in Figure 5); Innovate unique design by this, make entry needle of the present utility model (31) can't be exposed to the outside and stab medical personnel and cleanup crew, and the function of the self-destruction of tool two roads protection reclaims fully after the user only can once use and destroys, and causes the practical improvement of secondary pollution to avoid reusing.

See also shown in Figure 6, it is second embodiment of the present utility model, described needle stand is a needle changeable needle stand form, it mainly is that needle stand (20B) outer rim precalculated position is provided with O shape ring (21B), inside is concaved with buckling groove (22B), the outer rim of buckling groove (22B) convexes with protuberance (23B), and the relative position that front end is extended with the entry needle socket (25B) of pushing face-drawing and locks screw thread (27B) admittedly is provided with an entry needle (26B), and entry needle (26B) can screw in entry needle socket (25B) along locking screw thread (27B) admittedly, so that the purpose of changing and locking entry needle (26B) admittedly to be provided.

See also shown in Figure 7, it is the 3rd embodiment of the present utility model, described needle stand is another form of needle changeable needle stand, it mainly is that needle stand (20D) outer rim precalculated position is provided with O shape ring (21D), inside is concaved with buckling groove (22D), the outer rim of buckling groove (22D) convexes with protuberance (23D), and the relative position that front end is extended with the entry needle socket (25D) of pushing face-drawing is provided with an entry needle (26D), and entry needle (26D) can insert the packing location along entry needle socket (25D), reaches the fixedly purpose of entry needle (26D) to provide to change.

It is true as follows that this utility model effect is promoted:

Main purpose of the present utility model provides a kind of injection needle restoring formula safety injector structural improvement; The problem points that its desire solves, system is two sides symmetry kenel at the engaging foot system of the existing lining of known withdrawn needle type syringe, when plunger body bounces back in syringe is inner, its entry needle only bounces back to syringe inside for parallel shape, if during the push rod of pushing tow syringe inside, this entry needle is still had an opportunity to release syringe exterior problem point and is improved breakthrough inwardly; And the technical characterstic that it is dealt with problems, main system is arranged with the asymmetric first engaging foot (23) and the second engaging foot (24) according to elasticity holding section (22) front end two sides of this push rod (20), wherein this precalculated position, first engaging foot (23) outside is formed with depressed part (28), and the elasticity holding section (22) of this push rod (20) snaps into the buckling groove (32) of needle stand (30) when interior, and two outer side-lines of this elasticity holding section (22) produce tension force and urge buckling groove (32) inwall in needle stand (30); Innovate unique design by this, make entry needle of the present utility model (31) can't be exposed to the outside and stab medical personnel and cleanup crew, and the function of the self-destruction of tool two roads protection reclaims fully after the user only can once use and destroys, and causes the practical improvement of secondary pollution to avoid reusing.

The foregoing description specifies this utility model, though and describe through specific term in the literary composition, when not limiting scope of the present utility model with this; Those skilled in the art is when can be after understanding spirit of the present utility model and principle it is changed and revise and reaching equivalent purpose.

Claims

1, a kind of injection needle restoring formula safety injector, form by push rod, cylindrical shell and plug, wherein barrel front end is formed with spacing zone, this spacing zone axially is assembled with a needle stand and entry needle, the needle stand rear end is formed with buckling groove, and the buckling groove of the corresponding needle stand of push rod front end is extended with the elasticity holding section, the elasticity holding section of push rod cooperates the buckling groove of intercalation needle stand, and elasticity holding section front end offers inwardly and urges the space, the elasticity and elasticity holding section two sides contract in having is so that behind the buckling groove of intercalation needle stand and then closely block mutually; It is characterized in that:

Elasticity holding section front end two sides of this push rod are arranged with the asymmetric first engaging foot and the second engaging foot, wherein this first engaging outside of foot precalculated position is formed with depressed part, and when the elasticity holding section of this push rod snapped in the buckling groove of needle stand, two outsides of this elasticity holding section produced tension force and urge buckling groove inwall in needle stand;

When push rod was embedded in needle stand and application of force retraction, the buckling groove inwall of this needle stand promptly strutted tension force according to first and second engaging foot elasticity, and when making needle stand and injection needle restoring to cylindrical shell, and it is crooked that this needle stand and entry needle promptly are beat towards the depressed part of the first engaging foot.

2, injection needle restoring formula safety injector according to claim 1, the buckling groove that it is characterized in that this needle stand engages the guiding incline that is formed with taper for this elasticity holding section front end mutually with the elasticity holding section of push rod, and the side relative position is formed with the stop section after the guiding incline, and the inner lateral margin of the buckling groove of this needle stand convexes with protuberance.

3, injection needle restoring formula safety injector according to claim 1 is characterized in that the depressed part of this first engaging foot is the recessed edge shape of circular arc.

4, injection needle restoring formula safety injector according to claim 1 is characterized in that described needle stand is glutinous pin type needle stand.

5, injection needle restoring formula safety injector according to claim 1 is characterized in that described needle stand is the needle changeable needle stand.