CN106668989A - Retractable syringe - Google Patents

Abstract

An automatically retractable syringe comprises a cylinder and a plunger, wherein the plunger is combined with a needle joint fixed in other modes. A bias pressure element can push the needle joint into a cavity in the plunger.

Description

Retractable syringe

Technical field

The present invention relates to syringe manufacture field.Especially, the present invention relates to a kind of contracting formula Safety injector, wherein pin can return to syringe by spring or similar mechanical device after use Guan Zhong.

Background technology

Safety injector for hypodermic needle is going to a kind of very important health care work Tool.This syringe prevents the ability of needlestick injuries of crucial importance in terms of the propagation of prevention blood borne disease.

A kind of particular type of safety injector is exactly retractable syringe.As such a syringe, The mechanical device of usually spring is provided with inside it, it is activated after the completion of fluid injection, thus The spring works are withdrawing the pin in syringe tube.Can so prevent pin from causing pricking wound, especially, Pin operator can be made by one-handed performance retracting needle, so as to easily realize in busy hospital or Injected for patient clinic.

WO2006/096901 discloses a kind of retractable syringe, wherein, there is provided one kind has energy Enough syringes for accommodating the hollow plunger that can return pin and needle interface, needle interface and pin are expanded by spring Plunger is launched into, and spring is applied to by plunger and needle interface is kept in place by limited spring release Component on pressure release.

Such syringe is commonly known as " auto retractable ", is meant that the machine by syringe itself Tool device is retracted starting pin, rather than requires that operator draws, pushes away or otherwise moves into pin In syringe tube.

This retractable syringe the disadvantage is that, they are easy to fluid seepage, it is and described Mechanical device is easily affected by reliable operation sex chromosome mosaicism.

The syringe of other designs is due to relative complex, so manufacture is difficult or cost intensive.Also its The syringe that it is designed is fully allocated cannot injectable fluid due to leaving dead band in syringe tube. Therefore, it is an object of the present invention to provide a kind of retractable syringe structure, can at least improve and show There are some related problems of technology.

The content of the invention

According to the first aspect of the invention, there is provided a kind of auto retractable syringe, with cylinder and The plunger that can be moved in the cylinder, the cylinder has the gland component being arranged in its front portion, The gland component accommodates moveable needle interface, and hypodermic needle is connected to the needle interface；Wherein, Biased element is arranged between the gland component and the needle interface, so as to contribute to connecing on the pin Mouth pushes the body；Wherein, the plunger has the inner chamber that can receive the needle interface；Wherein, The needle interface is being held in place using being front stopped device, prevents the needle interface from passing in and out the cylinder； Wherein, the plunger is combined with the needle interface, promotes the stop device to discharge, and makes the bias Element can push the needle interface in the inner chamber of the plunger.

Such syringe represents improvements over the prior art, this to be improved by mitigating or eliminate The seepage of fluid, also simplifies syringe, and thus has more economical construction.Pin is in cylinder The interior moment by biased element (such as spring), it is meant that the syringe can be in an action Use and discard, and can be by one-handed performance.

Preferably, the stop device includes one or more stop area being located in the needle interface, The profile of one or more of stop areas is prevented from the needle interface when combined and is moved into and out The cylinder；And one group of elastic claw, the elastic claw have and occupy of stop area or many The complementary profile of individual retainer, so as to needle interface locking is in place, overcomes the biased element Thrust.It is highly preferred that the Internal periphery of the retainer is square or rectangle.It is this by forbidding Needle interface makes it be more securely held in the stop device of position there is provided unique excellent in both direction movement Gesture.

In a preferred embodiment, the upper region of the elastic claw have be inclined away from inclining for the needle interface Inclined-plane so that when being combined along the element that injection direction is moved, exerted forces are thus, it is possible to contribute to Promote the elastic claw away from the needle interface, so as to discharge needle interface, and make the biased element Needle interface can be pushed in the plunger.This upper surface makes the combination of elastic claw more reliable, and leads to Crossing another moving parts can simplify combination, so that elastic claw departs from the state of controlled.

Preferably, the plunger has block in its fluid binding end, and the block is protected by stop device Hold in place, this can be overcome the power that needle interface pushes plunger by biased element.So can be with Plunger is set to forced back towards along with the needle in cavity.Plunger device can also be made easy to manufacture, and can be carried For the plunger block with more efficient shape, such as block of the fluid faying face with spherical calotte.

In a preferred embodiment, the biased element is spring, and the spring is with Partial shrinkage Mode is installed.Spring section compression (contrasting with full compression) can make construction simpler, more preferably control Retraction operation processed.

Below in conjunction with accompanying drawing, by specific, non-limiting example to the preferred embodiments of the present invention Illustrate.

Description of the drawings

Fig. 1 is the schematic cross-section at " pin " end of the syringe according to the present invention.

Fig. 2 is the schematic cross-section according to syringe of the invention before injection is completed.

Fig. 3 is that the syringe shown in Fig. 2 will complete schematic cross-section when injecting.

Fig. 4 is the schematic cross-section of the syringe shown in Fig. 3, and it shows the subsequent retraction of needle interface.

Specific embodiment

This can be embodied by the way that workpiece to be arranged on " distribution " end of regracting syringe Invention.The present invention can be better understood from reference to accompanying drawing.

Referring to Fig. 1, it is shown that auto retractable syringe 5.The critical piece of the syringe be cylinder 10, Plunger 15, gland 20 and pin 25.Gland 20 is inserted in a press fit manner in cylinder 10, will Needle interface component is accommodated in the inner.Gland can also adopt screw-in.

Needle interface component includes needle interface 30, and pin 25 is inserted into the needle interface.Slide activation sleeve 35 are arranged on around needle interface, and are provided with Partial shrinkage spring 40 between these two parts.Bullet The step rearward face 45 and the inside stepped surface 50 of sleeve 35 of spring 40 and needle interface Contact.Therefore, the effect of spring is to tend to relative sleeve 35 to promote needle interface 30 backward.

However, before dispensing, this tendency of spring 40 is hindered by stop device.This device by Three elastic claws 55 from the protrusion of interior front surface 60 of gland 20 are constituted.Each of the pawl has Towards the square or rectangular flange 65 of needle interface 25.Elastic claw also has rearmounted " head " surface 85, the surface is smooth but inclined so that its uppermost top from interface 30 most portionafrom theasurface, And the surface is at " the distribution end " of pawl 55 closer to interface 30 or gland 20.

Activation sleeve 35 is machined with chamfering around its leading edge, generates the surface 90 with angle.In assembling In, complementary " head " surface 85 that inclines of this chamfer surface 90 as much as possible adjacent to three pawls 55 positions. This positioned adjacent means faster to make a response to activating the distribution pressure on sleeve 35, As long as because through less distance.

Needle interface 30 is provided with complemental groove 70 in its circumference so that flange 65 is matched somebody with somebody in predistribution Can be accommodated in the groove 70 in putting.Because lip/recess combination square shape can in case Only interface 30 is moved along direction forward or backward, the position and shape of the groove 70 and flange 65 Very reliable Immobile positioning is provided for needle interface.

O-ring 75 is arranged at around the excircle of activation sleeve 35, and is positioned at the interior of gland 20 In interior grooves 80 in surface.More effectively sealing is provided so around interface/sleeve assembly, In case fluid spills during injecting.

Plunger 15 is formed as the hollow cylinder with inner chamber 100.The end of the plunger cylinder is by rubber Made by block 105 seal, and be held in place by common back-up ring 110.In the outer of plunger cylinder Portion is provided with rubber blanket 115, and it is combined with the inner surface sealing of cylinder 10.Block positioned above Surface 120 is spherical calotte, and the rear surface 125 of needle interface 30 shapes in a complementary fashion, to provide Maximize administration and minimum " dead band ".

Referring to Fig. 2, it is shown that the injecting fluid stage of syringe of the invention 200, the liquid position In the cavity 205 formed between plunger 215 and the rear of needle interface 225.In remaining part such as Fig. 1 It is described.Furthermore, it is noted that, " air effusion " hole 210, the hole are provided with plunger tube 215 Requirement enables air to escape when interface (subsequent) is pushed into cavity 205.

Referring to Fig. 3, it is shown that the syringe shown in Fig. 2 is in complete injection point, i.e., just when plunger 315 Situation when applying pressure on the rear end 300 of activation sleeve 335.When activation sleeve 335 forward During promotion, it can be seen that the forward face 390 and " head " surface with angle of pawl 355 into chamfering 385 contacts, and start driving pawl away from interface 330, thus cause flange 365 to start and groove 380 Depart from, with release spring 340.

Referring to Fig. 4, it is shown that the syringe shown in Fig. 3 after stop device release.Spring 440 extends, During thus needle interface 430 and block 505 to be pushed well the inner chamber 500 of plunger.Pin can be seen 425 body interiors for being also pushed into syringe 405 well.At this point it is possible to syringe is safely processed, Without the risk of pricking wound.

It will be understood by those skilled in the art that above-described embodiment is only how to realize present inventive concept One example.Although it is understood that other embodiments are considered being different from detail The present embodiment, but also will fall into identical inventive concept, represent identical invention.

Claims (7)

1. auto retractable syringe, with cylinder and the plunger that can be moved in the cylinder, institute State cylinder and there is the gland component being arranged in its front portion, the gland component accommodates moveable pin and connects Mouthful, hypodermic needle is connected to the needle interface；Wherein, biased element be arranged on the gland component and Between the needle interface, so as to tend to for the needle interface pushing the body；Wherein, the plunger With the inner chamber that can receive the needle interface；Wherein, the needle interface is using being front stopped device It is held in place, prevents the needle interface to be moved into and out the cylinder；Wherein, the plunger and the pin Interface is combined, and promotes the stop device to discharge, and enables the biased element to push away the needle interface Enter in the inner chamber of the plunger.

2. syringe as claimed in claim 1, wherein, the stop device includes one or many The individual stop area in the needle interface, one or more of stop areas have when combined It is prevented from the profile that either internally or externally move of the needle interface in the cylinder；And one group of bullet Property pawl, the elastic claw has the profile complementary with one or more retainer for occupying stop area, So as to overcome the thrust of the biased element that needle interface locking is in place.

3. syringe as claimed in claim 2, wherein, the Internal periphery of the retainer is square Or rectangle.

4. syringe as claimed in claim 3, wherein, the upper region of the elastic claw has and inclines Away from the inclined plane of the needle interface so that when being combined along the element that injection direction is moved, applied Reinforce thus, it is possible to contribute to promoting the elastic claw away from the needle interface, so as to discharge needle interface, And enable the biased element needle interface be pushed in the plunger.

5. the syringe as described in one of aforementioned claim, wherein, the plunger is combined in its fluid End has block, and the block is held in place by stop device, and this can be connect on pin by biased element Mouth pushes the power of plunger and is overcome.

6. syringe as claimed in claim 5, wherein, the block has the fluid of spherical calotte Faying face.

7. the syringe as described in one of aforementioned claim, wherein, the biased element is spring, And the spring is installed in the way of Partial shrinkage.