CN1114590A

CN1114590A - Safety syringe with automatic retraction hollow needle

Info

Publication number: CN1114590A
Application number: CN 94108226
Authority: CN
Inventors: 帕尔罗·卡塞利
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-07-08
Filing date: 1994-07-08
Publication date: 1996-01-10

Abstract

A syringe with means for automatically gripping the needle and means for retracting the needle into the syringe at the end of the injection, comprising the following components: an outer cylinder and an inner cylinder; openings at two ends of the outer cylinder; an opening at one end of the inner cylinder; a closing device for the opening of the inner cylinder; a needle with an end; a sealing device in the enclosure; spring means urging the needle towards the element; a spring-loaded device for clamping a portion of the needle at the distal end of the needle and for releasing the needle; a diaphragm which is integrated with the element and can be bent before being broken; means for preventing the entry of an object into the syringe; a holding device for preventing the inner cylinder from being drawn out through the tail end of the syringe.

Description

The safety injector of book band automatically retractable hollow needle is described

The present invention relates to a kind of syringe, it is equipped with a cover pin is clamped in the clamping device of injection position, and the device that makes when injection finishes in the pin energy retract syringes body is housed.

Known some syringe is equipped with when injection finishes automatically the device of pin withdrawal.

A kind of United States Patent (USP) the 4th that is disclosed in the application of Edward F Yael Arad in these syringes, 838, in No. 869, a kind of subcutaneous injection pin that this patent relates to, after injection finishes, understand in the indentation syringe body, thereby prevent this pin of reuse, and prevent usually and this pin diseases associated of reuse spreads.This syringe comprises urceolus and inner core, has first end with first opening that above-mentioned spicula is gone out on urceolus, and has second end with second opening to make inner core pass urceolus and move.Inner core is positioned within the urceolus institute limit scope, so that admit when pin bounces back and store this pin.

In syringe, form vacuum when twitching plunger outward, be equipped with can with the plunger assembly of the inwall sliding-contact of urceolus, thereby, when promoting plunger outward, just can suck liquid in the urceolus, inwardly during actuation plunger, it can be discharged.

The pin that stretches out by second opening of urceolus has individual end, and its diameter is thicker than pin a little, so just forms an available limit, and when this featheredge is fixed within urceolus first end, pin is also just firmly located; Pin is loaded by spring, thereby in case gulde edge touches the end of plunger, spring-loaded pin will be thrown off, and returns in the inner core to store away.

United States Patent (USP) the 4th, 838, injection device also has the following an open question shown in No. 869.

1. syringe is emptied completely;

2. envelope is sheared the envelope wall unit among the opening of second cylinder that is entangled by first cylinder;

3. prevented that pin from easily being taken after using syringe;

4. sealing device is positioned on the appropriate location, is admitted in that cavity of adorning the end of depositing pin in case inject used liquid;

5. adorn pin suitablely mutually with urceolus;

6. inner core is clamped by urceolus, thereby prevented that pin from being taken easily after using syringe.

Say that as claims the present invention is intended to remedy above these defectives.The way of dealing with problems is to create a kind of syringe, and it has the clamping device that the folder pin is used, and has and can make pin be retracted into device in the syringe body automatically when injection finishes.Use syringe of the present invention, can receive following effect: before the injection, the jaw device of clamping needle can make pin be fixed on the tram automatically; Above-mentioned jaw device can make pin when injection finishes in the retract syringes body, and makes pin block any inlet of syringe.

In addition, owing to there are sharp-pointed parts to be placed on the end pedestal of pin, liquid will all be injected in the patient body, and second cylinder that this pin enters syringe also become easily.

Advantage of the present invention is that mainly inner core was clamped by urceolus when injection finished, and like this, syringe can prevent that pin from being taken easily after crossing.

Below, describe a kind of mode of the present invention of implementing in detail with reference to accompanying drawing.Only represent a specific embodiment of the present invention in the accompanying drawing.

Fig. 1 is the vertical view of syringe of the present invention;

Fig. 2 is the top plan view of syringe urceolus;

Fig. 3 is the part sectioned view of syringe;

Fig. 4 is the exploded view of the thin portion of syringe structure;

Fig. 5 is the profile of pin, the end of expression pin and the clad that comprises sharp-pointed parts;

Fig. 6 is inner core and the exploded view of blocking the liner of this opening;

Fig. 7 is the front view of syringe;

Fig. 8 shows that injection finishes syringe situation before;

Fig. 9 is the partial sectional view after syringe was used;

Figure 10 shows the pin that is equipped with sharp-pointed parts of 4 tips.

Figure 11 is the plane graph of pin shown in Figure 10.

Syringe shown in each accompanying drawing is included in first hollow cylinder 1 of outside, and it has a vertical axis of symmetry, and first opening 2 and second opening 3; Second opening is located on the end 4 of the tubular hollow unit 5 that extends cylinder 1 outside; A pin 6 protrudes in outside the syringe by second opening 3.

Second hollow cylinder 7 places among first cylinder 1 by opening 2; Second cylinder 7 is coaxial with first cylinder 1, and an outer end 8 that is made of blocking element 9 is arranged, and cylinder 7 is pushed into along injection direction.

Second end 10 of cylinder 7 is shown as an opening 11 facing to first cylinder, 1 the inside, and it can be closed by a closure elements 12, and is shown in Figure 6 brighter.

The some of pin 6 places among the clad 13 of a shape such as pipe, this clad has an end 14 in first cylinder, 1 the inside, end 14 is equipped with the sharp-pointed parts 15 of a shape such as sharp edge hat arch or a pushing ram with 4 sharp-pointed parts 15 is housed, and the diameter of this afterbody is decided according to the diameter of syringe.

Clad 13 is the layer of aluminum material preferably, and its side 16 rolls across flower, so that the frictional force when increasing the metal covering contact, in addition, clad 13 accurately wraps the some of pin 6.

In the one embodiment of the invention that does not show, clad 13 is one deck plastics or one deck synthetic resin, its coefficient of friction height.

Opening 3 preferably one from syringe the inside the seat 23 of broadening to the outside so that cooperates, each parts 18 of the clamp element on the annular knurl side 16 17 are clamped with spring 21, spring 21 then energy is pushed down clamp element 17 inside the syringe.

Clamp element 17 comprises three resilient parts 18, thereby when each parts 18 is attached to seat 23 the time, this element just can clamp clad 13; And when each parts 18 when seat 23 is removed, it can unclamp clad again.

Clamp element 17 is made on a tubular body 19 that wraps in hollow unit 5 the insides fully, and three parts 18 and the main body 19 of clamp element 17 are connected as a single entity.

The outer surface of main body 19 has a crown body of annular, above first end of spring 21 leans against; Second end of spring leans against near the opening 3 hollow unit 5 a part of formed ring surfaces 22.The shape of three parts 18 can make clad 13 steadily clamp around the axis of symmetry of cylinder 1.

Liner 24 is between the inner surface of the outer surface of main body 19 and member 5, and this liner is equipped with radial slot, makes radial slot that liquid is adorned through end 14 from cylinder 1 and passing through.Or rather, in the openning 26 of liner 24 between cylinder 1 and member 5, in case liquid is among cylinder 1 inflow hollow unit 5.

The sharp-pointed parts 15 that stretch into gently in the cylinder 1 and the clad 13 by a coaxial line cavity 28 of demonstrating embodiment illustrated in fig. 3, this clad 13 passes the clamp element 17 that clamps it and reaches outside the syringe.In addition, spring 29 is between the ring surface 31 of the annular surface 30 of end 14 and near the cavity 28 the opening 3, and this spring 29 can and place the pin 6 of same clad 13 to push away towards cylinder 1 the inside clad 13.

Second cylinder 7 is vertical cavity 32 that can hold pin 6, and this cavity 32 is being slided in the cylinder 1 so that cylinder 7 is sealed along the element of drawing and the direction of injection moves 12.Cause for this reason, element 12 is equipped with two sealing rings 33,34, in case liquid flows in the cylinder 1 that some between the element 12 and opening 2.

Element 12 is equipped with a barrier film 35 blocks opening 11, this barrier film 35 be subjected to sharp-pointed parts 15 effect and before breaking, because of same sharp-pointed parts 15 extruding can be crooked.Syringe just is emptied completely by this way.

Cause for this reason, barrier film 35 are contained in one and stretch toward the top of the Cylinder shape constructional element 36 of opening 3 from element 12.The shape of the pedestal of member 36 and element 12 such as the surface 37 of truncated cone link to each other, and this surperficial gradient is identical with end wall 39 gradients of urceolus 1, and the qualification retainer that moves along injection directions for cylinder 7.The shape of these gradients and barrier film 35 makes cylinder 7 reach when end of travel along injection direction, and syringe just is emptied completely.

The diameter of second cylinder 7 is less than the diameter of first cylinder 1, and it and 4 rib ribs are connected as a single entity, and these rib ribs are along the axis of symmetry direction of cylinder 7, and extending longitudinally is between the blocking element 9 of the stop medicated cap 41 of element 12 and cylinder 7 outer ends.

For element 12 is remained on the position such in cylinder 1 that some that can move around in cylinder 1 and prevent between liquid inlet opening 2 and the element 12, put a ring 42 between stop medicated cap 41 and opening 11, ring 42 is entangled by the element 12 inner cannelures 43 that form.

Move around among first cylinder 1 in order to stop second cylinder 7, just the stop device 44 that constitutes with cannelure 45 in first cylinder 1 medial wall and the teeth on the rib rib 40 46 is realized.

Groove 45 is tiltedly received gradually narrow along the connection opening 2 and the direction of opening 3, like this, teeth 46 just can make cylinder 7 move towards opening 3, move to opening 2 and limit it, so that syringe is filled.

Below explain the operating process of syringe of the present invention.

Before the injection, syringe is in position shown in Figure 2.For the liquid inhalation syringe, can move cylinder 7 towards the end 14 of pin 6 like a dream.Cylinder 7 moves towards opening 2, and liquid is entered between liner 24 and the element 12 in that a part of cylinder 1.

When injection, cylinder 7 is pushed to opening 3, and liquid is injected in the patient body.

When the outer surface of barrier film 35 contacted sharp-pointed parts 15, Cylinder shape constructional element 36 just began bending, so that surface 37 is contacted with the end wall 39 of cylinder 7, thereby syringe was emptied completely.

Cylinder 7 is during towards opening 3 mobile ends, and element 12 is just being moved towards opening 3 by the liner 24 of spring 21 roof pressures.Because the body of liner and clamp element 17 is connected as a single entity, the latter just moves syringe outwardly, and three parts 18 of clamp element 17 from seat 23 remove, uncovered, like this, clad 13 and pin 6 are just loose.Spring 29 then promotes clad 13 and pin 6 towards barrier film 35, like this, sharp-pointed member 15 just can also be opened opening 11 by bursting barrier film 35.

When this operating process finished, pin 6 was positioned among the cylinder 7, and was subjected to the parts 18 of the heavy closed clamp 17 of the effect of spring 21, just prevented from hands is inserted the syringes from opening 3.

Cylinder 7 moves towards opening 2, is subjected to placing teeth 39 restrictions of groove 38, and like this, when injection finished, syringe just can not have been opened.

Claims

1. the safety injector that has the hollow needle that can bounce back has by following parts:

First cylinder (1) outside and second cylinder (7) inside;

First and second openings (2,3) at first cylinder (1) two ends;

The 3rd opening (11) at second cylinder (7) one ends;

The locking device (12) of sealing opening (11);

At the pin (6) that extend the syringe outside, this pin (6) is loaded in above-mentioned second cylinder (7), and this pin (6) has an end (14);

Sealing device (33,34) is arranged, in case liquid is admitted in first cylinder (1) of that part between above-mentioned locking device (12) and above-mentioned first opening (2) in above-mentioned locking device (12);

Can push against the spring assembly (29) of above-mentioned locking device (12) to above-mentioned pin (6);

Can support the clamping device (17) of the above-mentioned pin (6) of this syringe outside;

Prevent to use the plugging device (17,18) that above-mentioned pin (6) is taken after this syringe;

Prevent to use above-mentioned second cylinder (7) after this syringe to shift out stop device (44) outside this syringe;

It is characterized in that said syringe also comprises:

Connecting above-mentioned locking device (12) so that a barrier film (35) of above-mentioned the 3rd opening of blocking (11), it can be crooked when this barrier film (35) is promoted by above-mentioned end (14), so that above-mentioned second cylinder (7) contacts with the end wall (39) of above-mentioned first cylinder (1), so that this syringe is emptied completely;

Sharp-pointed parts (15) that link to each other with above-mentioned end (14), in order at above-mentioned second cylinder (7) when injection direction arrives abundant impulse stroke position, the above-mentioned diaphragm of bursting (35).

2. syringe as claimed in claim 1, it is characterized in that: above-mentioned clamping device (17) is a clamp element (17) that comprises three resilient parts (18), and these parts can steadily clamp above-mentioned pin (6) round the axis of symmetry of said syringe.

3. syringe as claimed in claim 2 is characterized in that: the spring (21) of above-mentioned clamping device (17) can be above-mentioned clamp element (17) towards this syringe the inside extruding; Above-mentioned second opening (3) have one from this syringe the inside the seat (23) of broadening to the outside so that cooperate, thereby above-mentioned resilient parts (18) are clamped on the side of above-mentioned pin (6) with above-mentioned spring (21); Above-mentioned second cylinder (7) can push away the outside of past this syringe to above-mentioned spring (21), thereby above-mentioned resilient parts (18) are removed from above-mentioned seat (23), so that unclamp above-mentioned pin (6).

4. syringe as claimed in claim 1 is characterized in that: the part of pin (6) places the clad (13) of a shape such as pipe, and this clad has an end (14) in first cylinder (1) the inside; This clad accurately encases the some of pin (6); The side of this clad (13) rolls across flower, so that increase above-mentioned resilient parts (18) when being in the close position and the frictional force between this annular knurl side.

5. syringe as claimed in claim 1 is characterized in that: above-mentioned clamping device (17) has a cavity (28); First of this cavity (28) outside syringe is partly sealed by above-mentioned clad (13), and second part of this cavity (28) inside syringe is sealed by above-mentioned afterbody (14).

6. syringe as claimed in claim 5, it is characterized in that: above-mentioned spring assembly (29) places above-mentioned cavity (28), and this spring assembly (29) is arranged between the ring surface (31) that the ring surface (30) of above-mentioned end (14) and contiguous that some of second opening (3) of above-mentioned cavity (28) form; This spring assembly (29) can advance with the above-mentioned pin (6) that places identical clad (13) above-mentioned clad (13) towards above-mentioned first cylinder (1) the inside.

7. syringe as claimed in claim 5 is characterized in that: above-mentioned end (14) are equipped with sharp-pointed parts (15) in order to the above-mentioned diaphragm apparatus of bursting (35).

8. syringe as claimed in claim 7 is characterized in that: above-mentioned diaphragm apparatus (35) is installed in a top of stretching the Cylinder shape constructional element (36) of past above-mentioned second opening (3) from above-mentioned closure elements (12).

9. syringe as claimed in claim 8 is characterized in that: the surface (38) of shape such as truncated cone is in the above-mentioned closure elements (12), and the gradient of this surface (38) is identical with end wall (39) gradient of above-mentioned first cylinder (1); This end wall (39) is the qualification retainer that above-mentioned second cylinder (7) moves along injection direction; The shape of above-mentioned these gradients and above-mentioned closure elements (12) makes second cylinder (7) reach when end of travel along injection direction, and syringe just is emptied completely.

10. syringe as claimed in claim 1 is characterized in that: the teeth (46) on the rib rib (40) that described stop device (44) is connected as a single entity by the cannelure (45) in above-mentioned first cylinder (1) medial wall with above-mentioned second cylinder (7) constitute; This cannelure (45) is tiltedly received gradually narrowly along connecting above-mentioned first opening (2) and the direction of second opening (3), so that allow these teeth (46) that second cylinder (7) is moved toward second opening (3), and limits it and moves to first opening (2) in order to fill syringe.