CN1654094A - Safety syringe - Google Patents
Safety syringe Download PDFInfo
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- CN1654094A CN1654094A CN 200410039572 CN200410039572A CN1654094A CN 1654094 A CN1654094 A CN 1654094A CN 200410039572 CN200410039572 CN 200410039572 CN 200410039572 A CN200410039572 A CN 200410039572A CN 1654094 A CN1654094 A CN 1654094A
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- syringe
- plate
- sliding sleeve
- push rod
- elastic extension
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Abstract
The present invention is one kind of simple convenient cheap safety syringe with needle protecting function and self-destruction function. The safety syringe includes sliding sleeve, needle, needle cylinder, piston, locking sleeve, spring and push rod inside the cylinder, and features the initial safe location of the sliding sleeve, simple and reliable safe starting and unique self-locking mechanism for dynamic location to ensure the safety and the once use of the syringe. The syringe of the present invention may be single hand operated.
Description
Technical field
The present invention relates to a kind of safety injector, particularly relate to a kind of destructing safety syringe with Tip protection function.
Background technology
At present; disease by propagation such as blood body fluid is more and more; it is the main path of pathogen transmission that the syringe needle of the syringe after syringe repeatedly uses and uses is dealt with improperly; and common disposable syringe is using after regular meeting stabs the treatment people of medical personnel or hospital refuse; there is very big potential safety hazard; though existing both at home and abroad many patents provide disposable safety injector; but it is most because of complex structure; manufacturing cost is high or because of using inconvenience, function imperfection and fail to be used widely.
Application number is that 94101555.6 patent of invention discloses a kind of disposible safety syringe; this syringe comprises a protective casing; the outside that is contained in syringe that this protective casing is longitudinally-slidable; make protective casing can move on to home forward from the contraction inoperative position; syringe needle stretches out protective casing on the inoperative position shrinking; this protective casing also has fixture so that automatically protective casing is remained on its home forward, makes protective casing not shrink with respect to syringe.Though this invention can play a protective role to syringe needle, still there is following several problem in it:
1, the overall structure more complicated of this invention, thus make the complex structure of mould, and this will have influence on die life.Cause thus to produce and drop into and the cost increase.
2, the parts of this invention are various, increase the assembly technology difficulty, increase production cost.
3, this invention has just realized the protection to syringe needle, does not realize self-locking, self-destruction to whole syringe, and its part (as push rod) can be taken out and continue to use, and still has potential safety hazard for the patient.
4, this invention syringe stays certain headspace at its front end, and this some application to syringe (as blood drawing) brings very big inconvenience.
The innovation and creation content
The purpose of this invention is to provide a kind of simple in structurely, easy to use, with low cost, not only had Tip protection function, but also safety injector that can self-destruction.
For achieving the above object, the present invention takes technical scheme: a kind of safety injector, include: sliding sleeve, syringe needle, syringe, piston, spring and place push rod in the syringe, the syringe front end is provided with a conehead that cooperates with described syringe needle and dress pin screw thread, syringe needle is installed on the conehead of described syringe front end by described dress pin screw thread, described push rod front end has the union joint that cooperates with described piston, it is characterized in that: described sliding sleeve is set in outside the described syringe slidably, the sliding sleeve rear portion is provided with two elastic extension plates, respectively is provided with a connection piece on the described elastic extension plate; The sliding sleeve middle part offers a short groove at least, and described short groove place is provided with two elasticity clamps; The sliding sleeve front end is a necking down, and the necking down front end has a baffle plate, and described baffle plate center is provided with a hole that syringe needle is stretched out; The front end of described syringe is provided with a perpendicular end surface, and the cylindrical of syringe is provided with the elongated slot that cooperates with described elasticity clamp, and described elongated slot front portion is provided with a limiting plate, but described limiting plate holding is between described two elasticity clamps; Described syringe outer wall respectively is provided with a junction in the connector corresponding position with the elastic extension plate, and described connecting portion can be connected with the connector on the described elastic extension plate; Described push rod is provided with a sliding sleeve unlocking board in the corresponding position with described sliding sleeve elastic extension plate, at least one is the inclined-plane for the opposite face of described sliding sleeve unlocking board and described sliding sleeve elastic extension plate, when the sliding sleeve unlocking board contacted with sliding sleeve elastic extension plate, the effect low sleeve unlocking board on the inclined-plane can make sliding sleeve elastic extension plate open to both sides slightly.Described spring housing is located at outer the putting of the dress pin screw thread of described syringe, and is compressed between the perpendicular end surface of the baffle plate of described sliding sleeve and described syringe.
In the above-mentioned safety injector, described syringe rear portion is provided with the resistance ring that is no less than two; Described syringe also includes a lock sleeve, and described lock sleeve front portion is the conical surface that inwardly shrinks and has elongated slot more than two, and cylindrical also is provided with a snap ring in the middle of it; Described lock sleeve is installed in syringe endoporus rear portion and is set on the described push rod; Described push rod body is a crossed stiffened plate, comprises preceding crossed stiffened plate, middle crossed stiffened plate, step flaps and back crossed stiffened plate; The crossed stiffened plate overall dimensions is slightly larger than lock sleeve front end diameter of bore before described, and described middle crossed stiffened plate overall dimensions is less than lock sleeve front end diameter of bore, and described step flaps is at least one, and its external diameter is slightly larger than lock sleeve front end diameter of bore.
In the above-mentioned safety injector, the described triangular in shape and cross section, a cross section that is provided with at syringe endoporus rear portion is trapezoid resistance ring; The cross section of preceding resistance ring is triangular in shape, and its internal diameter is slightly less than the syringe internal diameter, and angle is less between described preceding resistance ring front bevel and axis, and the angle between back bevel and axis is bigger; Back resistance ring cross section is trapezoidal, and angle is all bigger between its forward and backward inclined-plane and syringe axis, and the internal diameter of described back resistance ring is less than preceding resistance ring internal diameter; The front end face vertical axis of the snap ring of described lock sleeve, back bevel and axis angle are bigger, and the external diameter of snap ring equals the syringe diameter of bore, and the width of snap ring is slightly less than the width of forward and backward resistance interannular in the syringe; The rear end face of the snap ring of described lock sleeve is slightly larger than the rear end face distance of the front end face of described lock sleeve to described step flaps to the distance of described back resistance ring front bevel.
In the above-mentioned safety injector, described connector is the draw-in groove hole offered on the elastic extension plate, described connecting portion on syringe, be provided with the corresponding boss in described draw-in groove hole, described boss can be fastened in the described draw-in groove hole; The connector of described elastic extension plate can also be one " T " font plate, and described syringe end is provided with a bulge loop, the groove that with described " T " font plate cooperate of described connecting portion on bulge loop, offering, and described " T " font plate can be fastened in the described groove; The connector of described elastic extension plate can be a hook-plate again, and the connecting portion of described syringe is the rear end face of syringe, and described hook-plate can be fastened on the rear end face of syringe.
In the above-mentioned safety injector, the diameter of the endoporus of described piston is greater than push rod head union joint diameter, and its length is greater than push rod union joint gauge 0.5～5mm.
In the above-mentioned safety injector, be equivalent to the lock sleeve front end face apart from the backward step plate on the crossed stiffened plate behind the described push rod and to snap ring rear end face distance one circular anti-slip plate be set, its external diameter is slightly less than lock sleeve rear end diameter of bore; One weak bonding pad is set on the crossed stiffened plate behind the described push rod, connects by two little joint pins of breaking that are centrosymmetric between its horizontal gusset, connect by the arrowband that can break between the vertical gusset.
In the above-mentioned safety injector, be a transition inclined-plane or transition frustum between crossed stiffened plate and the preceding crossed stiffened plate in the described push rod, inclined-plane and axis angle are not less than 30 °
In the above-mentioned safety injector, the end of the two elasticity clamps at the short groove of described sliding sleeve place is outstanding to the endoporus direction, and projecting height is slightly larger than the degree of depth of elongated slot on the syringe; The height of the boss of described syringe is less than the degree of depth in draw-in groove hole, and the width of described boss is less than the width in draw-in groove hole.
The present invention is owing to take above design, and it has the following advantages:
1, the present invention can carry out injection operation and start safety device by one hand, and is easy to use; Sliding sleeve is location and two-way locking automatically, guarantees that needle point is in the protection of sliding sleeve always in the processing procedure of this syringe after use, thereby the incident of avoiding needle point to hurt sb.'s feelings takes place.
2, the present invention has reliable auto-lock function, and after the use once, push rod promptly is locked in the syringe, and can not extract.Attempt reuses and all can cause the push rod fracture, and syringe is further damaged, and guarantees disposable use.
3, piston of the present invention can be assembled at the end, thereby simplified structure not only, conveniently uses operation (injection operation and ordinary syringe are identical), is easy to guarantee that injected dose is accurate, and is convenient to guarantee the safety of drawing blood and operating.The power of injecting during use changes little, does not influence the comfortableness of injection basically, and to start release mechanism (sliding sleeve reach) be after injection finishes, thereby start-up operation has no adverse effects to the patient.
4, medicinal liquid space structure of the present invention is simple, and the syringe part that contacts with medicinal liquid only is syringe and piston (identical with ordinary syringe), thereby can reliably avoid medicinal liquid contaminated, guarantees to demonstrate,prove injection safety.
5, the conveniently replaced standard needle of the present invention can satisfy the multiaspect instructions for use.
6, in similar safety injector, design of part is comparatively succinct, and it is comparatively convenient to make, and assembling is easy, thereby has high-performance, cheaply distinguishing feature.
7, structure of the present invention is easy to realize automatic assembling, for mass production has been created good condition.
Description of drawings
Fig. 1 is a structural representation of the present invention
Fig. 2 is the vertical view of Fig. 1
Fig. 3 is the structural representation of the present invention when drawing liquid
Fig. 4 is the structural representation of the present invention when injection finishes
Structural representation when Fig. 5 is broken for the present invention prevents to reuse
Fig. 6 realizes the structural representation of needle safety defencive function for the present invention
Fig. 7 is the structural representation of another embodiment of the present invention
Fig. 8 is the vertical view of Fig. 7
Fig. 9 is the structural representation of yet another embodiment of the invention
Figure 10 is the vertical view of Fig. 9
The specific embodiment
For structure of the present invention better is described, conjunction with figs. is described in detail as follows for an embodiment now:
As shown in Figure 1 and Figure 2, be an embodiment provided by the invention, the structural representation when it does not use after for the assembling of a kind of safety injector.This syringe includes: syringe needle 1, spring 2, sliding sleeve 3, piston 4, syringe 5, push rod 6 and lock sleeve 7.
The outside that is set in syringe 5 that sliding sleeve 3 slides, its rear portion is provided with two elastic extension plates 31, respectively be provided with a connection piece on the elastic extension plate 31, connector is in draw-in groove hole 311 that elastic extension plate 31 is offered in this enforcement, the sliding sleeve middle part offers two short grooves 32, and short groove 32 places respectively are provided with two elasticity clamps 321,322, and sliding sleeve 3 front ends are a necking down 33, the necking down front end has a baffle plate 34, and baffle plate 34 centers are provided with a centre bore 35 that syringe needle is stretched out.
The front end of syringe 5 is provided with a perpendicular end surface 53, the cylindrical of syringe 5 is provided with two elongated slots 54 that cooperate with elasticity clamp 321,322, elongated slot 54 front portions respectively are provided with a limiting plate 55, the end of two elasticity clamps 321,322 is outstanding to the endoporus direction, projecting height is slightly larger than the degree of depth of elongated slot 54 on the syringe, so can slide in elongated slot 54 in the end of two elasticity clamps 321,322, but and limiting plate 55 holdings between two elasticity clamps 321,322; The internal diameter rear portion of syringe 5 is provided with two resistance ring 56,57, the cross section of preceding resistance ring 56 is triangular in shape, its internal diameter is slightly less than syringe 5 internal diameters, angle is 10 ° between the front bevel of preceding resistance ring 56 and axis, back bevel and axis normal, back resistance 57 ring cross sections are trapezoidal, and angle is 45 ° between its forward and backward inclined-plane and syringe axis, and the internal diameter of back resistance ring 57 is less than the internal diameter of preceding resistance ring 56; Syringe 5 outer walls respectively are provided with a junction in the connector corresponding position with elastic extension plate 31, connecting portion is each boss 58 that is provided with of 311 corresponding positions, draw-in groove hole that is arranged on rear portion and elastic extension plate 31 behind the syringe in the present embodiment, the height of boss 58 is less than the degree of depth in draw-in groove hole 311, the width of boss 58 is less than the width in draw-in groove hole 311, and boss 58 can be fastened in the draw-in groove hole 311; In addition, for the ease of the equipment, between the cylindrical of perpendicular end surface 52 and syringe 5 by a conical surface 59 transition.
The crossed stiffened plate of push rod 6 is made into structure, size is different several sections: preceding crossed stiffened plate 62, middle crossed stiffened plate 63, step flaps 64 and back crossed stiffened plate 65; The overall dimensions of preceding crossed stiffened plate 62 is slightly larger than lock sleeve front end diameter of bore, middle crossed stiffened plate 63 overall dimensions are less than lock sleeve front end diameter of bore, by an inclined-plane 621 (the perhaps conical surface) transition, inclined-plane 621 is 45 ° with the angle of axis between preceding crossed stiffened plate 62 and the middle crossed stiffened plate 63; The number of step flaps 64 is one, and also by an inclined-plane 631 transition, inclined-plane 631 is 15 ° with the angle of axis between itself and the middle crossed stiffened plate 63; Be equivalent to lock sleeve 7 front end faces apart from step flaps 64 on the back crossed stiffened plate 65 and to snap ring 72 rear end face distances one circular anti-slip plate 66 be set, its external diameter is slightly less than lock sleeve 7 rear end diameter of bores; One weak bonding pad 67 is set on the anti-slip plate 66 of back crossed stiffened plate 65, connects by two little joint pins of breaking that are centrosymmetric between its horizontal gusset, connect by the arrowband that can break between the vertical gusset; Back crossed stiffened plate 65 is provided with a taper sliding sleeve unlocking board 68 in the corresponding position with the elastic extension plate 31 of sliding sleeve 3, sliding sleeve unlocking board 68 has at least one to be the inclined-plane with the opposite face of elastic extension plate 31, when push rod reach sliding sleeve unlocking board 68 contacted with sliding sleeve elastic extension plate 31, the effect low sleeve unlocking board 68 on the inclined-plane can make elastic extension plate 31 open to both sides slightly; In the present embodiment, the end face vertical axis of elastic extension plate 31, and sliding sleeve unlocking board 68 is a conical plate, the end diameter of sliding sleeve unlocking board 68 is less than the internal diameter of sliding sleeve 3, and outside diameter is greater than the internal diameter of sliding sleeve 3.
Certainly; the end face of elastic extension plate 31 is an inclined-plane; and sliding sleeve unlocking board 68 is a cylindrical plate, equally can reach sliding sleeve unlocking board 68 promotion elastic extension plates 31 and make it slightly to the open function in both sides, so above-mentioned two kinds of designs all belong to protection scope of the present invention.
The diameter of the endoporus of piston 4 is greater than the diameter of the union joint 611 of push rod head 61, and the length of piston 4 endoporus is greater than the thickness 3mm of push rod union joint 611.
In addition, the rear end face that also need guarantee the snap ring 72 of lock sleeve 7 is slightly larger than the rear end face distance of the front end face of lock sleeve 7 to step flaps 64 to the distance of back resistance ring 56 front bevels.
As shown in Figure 3, in use, move behind the push rod 6, drive piston 4 and move,, thereby realize drawing liquid (or blood drawing) in the syringe 5 anterior vacuum that form.When moving push rod transition inclined-plane 621 to and contact with the lock sleeve front end face, push rod will drive lock sleeve 7 and move behind the front bevel of preceding resistance ring 56, because preceding resistance ring 56 is highly less, the front bevel angle is very little, and 621 oblique angles, transition inclined-plane of push rod are bigger, so lock sleeve 7 will overcome preceding resistance ring 56 dampings and slippage backward, and the snap ring 72 on the lock sleeve 7 slide into syringe before, back resistance ring 56, in the time of between 57, because back resistance ring 57 internal diameters are less, and its front bevel and axis angle are bigger, thereby resistance increases, move after making lock sleeve 7 no longer, because there is good elasticity lock sleeve 7 front portions, its preceding flexure strip 71 is subjected to 621 effects of transition inclined-plane and push rod transition inclined-plane 621 is crossed in distortion and slide to crossed stiffened plate 62 surfaces before the push rod, realizes continuing drawing liquid (or blood drawing) and operates until drawing liquid (or blood drawing) and finish.Back pulling-pushing rod necessary when this syringe utilization is used as can be seen moves, realized the functional localization of lock sleeve 7, because the rear end face and the axis normal of preceding resistance ring 56, and the front end face of the snap ring 72 on the lock sleeve 7 also with axis normal, thereby realized that the lock sleeve 7 of functional localization can not move forward and backward.
As shown in Figure 4, the injection liquid operation is identical with ordinary syringe, be that push rod 6 promotes that pistons 4 move forwards and with medicinal liquid through syringe 5 and syringe needle 1 and in the injection human body in syringe, near the injection terminal point, because the lock sleeve front end face moves after before this, thereby the step flaps 64 on the push rod 6 will be by anterior flexure strip 71 endoporus of lock sleeve, because the preceding flexure strip 71 of lock sleeve 7 has better elasticity, thereby it is also less relatively to the resistance of push rod 6, unlikely causing injected the power significant change, can not cause that promptly injection is uncomfortable, contact with syringe endoporus antetheca once more that injection finishes when shifting piston 4 front end faces onto.Push rod 6 also was limited in the syringe 5 by lock sleeve 7 and can not pulls out once more this moment, because if this moment is pumpback push rod 6 backward once more, the rear end face of the step flaps 64 on it will contact with the front end face of lock sleeve 7, because both ends of the surface are equal and axis normal, thereby will produce very big resistance, and hole dimensions are close in the anti-slip plate 66 on the push rod 6 and the lock sleeve 7, thereby prevented to contract in the snap ring 72 on the lock sleeve and leave stopping of forward and backward resistance ring 56,57 and deviate from; Further increase pulling force, push rod 6 will take place to rupture and damage at joint pin on the 67 horizontal gussets of weak bonding pad and the thin linking belt place on the vertical gusset, thus reuse (as shown in Figure 5) that has prevented syringe.
As shown in Figure 6; during normal running; inject finish (or behind patient body extraction injection needle); when slightly firmly promoting push rod 6 forward again; because push rod union joint 611 thickness are less than hole length in the piston 4; thereby piston transition cylinder 41 will be compressed; be that push rod 6 can continue about 1～3mm that moves forward; sliding sleeve unlocking board 68 because injection finishes on the rear push-rod 6 has come close to or in contact with the end of sliding sleeve elastic extension plate 31; thereby when push rod 6 continues reach; inclined-plane 681 in the push pedal will contact with the end of elastic extension plate 31 and promote extension board 31 and outwards move; make the also outwards slippage of draw-in groove hole 311 end faces that contacts with syringe boss 58 end faces; when amount of movement during greater than the height of boss 58; under the effect of spring 2; relative slip will take place with 5 of syringes in sliding sleeve 3; stopped by the rear end face of the limiting plate on the syringe 5 55 and stop until the back elasticity clamp 322 on the sliding sleeve; because this sliding distance stretches out sliding sleeve 3 front end face length greater than syringe needle 1; thereby the needle point of syringe needle 1 is inclusive in the sliding sleeve 3; thereby avoided the injury of needle point, realized the safety protection function of syringe needle the people.Preceding elasticity clamp 321 on sliding sleeve this moment has been crossed the limiting plate 55 (because the spacing of two elasticity clamps is greater than thickness of limiting plate) on the syringe and has been dropped on position, the limiting plate 55 front end face left side as can be seen; stoped sliding sleeve to move backward; thereby sliding sleeve 3 is limited to position shown in Figure 6, has realized stable safety protection function.
In addition, as can be seen from Figure, wing plate 36 is mounted on the sliding sleeve 3, be that operator's forefinger and middle finger are to be clipped in sliding sleeve wing plate 36 places, thereby in case when sliding sleeve 3 and syringe 5 are relatively moved, be actually syringe 5 company's of sliding backward syringe needles 1 and be pulled into together in the sliding sleeve 3, the advantage of this layout is as the careless release mechanism that started, the result is that syringe needle will be pulled out human body automatically, rather than sliding sleeve reach contact human body, pain or the discomfort brought to the patient.Certainly wing plate 36 being installed on the syringe 5 also is a kind of feasible organization plan.
As Fig. 7, shown in Figure 8, structural representation for another embodiment of the present invention, the place that the embodiment that its relative Fig. 1～Fig. 6 provides mainly changes is that the connector of the elastic extension plate of sliding sleeve 3 is one " T " font plate 31 ', and syringe 5 ends are provided with a bulge loop 58 ', connecting portion on the syringe is the groove of offering on the bulge loop 58 ' 581 ' that cooperates with " T " font plate 31 ', and " T " font plate 31 ' can be fastened in the groove 581 '.After syringe is finished using; the same end face that promotes the elastic extension plate by sliding sleeve unlocking board 68; the elastic extension plate is slightly outwards opened; make the head 312 of " T " font break away from groove 581 '; at this moment under the effect of spring 2; relative slip will take place with 5 of syringes in sliding sleeve 3, and Tip protection is got up.
Fig. 9, shown in Figure 10 for another example, be the structural representation of an embodiment more of the present invention, the place that the embodiment that its relative Fig. 1～Fig. 6 provides mainly changes is that the connector of the elastic extension plate of sliding sleeve 3 is a hook-plate 31 ", its directly hook be located on the rear end face of syringe 5.After syringe is finished using; the same end face that promotes the elastic extension plate by sliding sleeve unlocking board 68; the elastic extension plate is slightly outwards opened; make the gib head 313 of elastic extension plate break away from the rear end face of syringe 5; at this moment under the effect of spring 2; relative slip will take place with 5 of syringes in sliding sleeve 3, and Tip protection is got up.
Claims (10)
1, a kind of safety injector, include: sliding sleeve, syringe needle, syringe, piston, spring and place push rod in the syringe, the syringe front end is provided with a conehead that cooperates with described syringe needle and dress pin screw thread, syringe needle is installed on the conehead of described syringe front end by described dress pin screw thread, described push rod front end has the union joint that cooperates with described piston, it is characterized in that:
Described sliding sleeve is set in outside the described syringe slidably, and the sliding sleeve rear portion is provided with two elastic extension plates, respectively is provided with a connection piece on the described elastic extension plate; The sliding sleeve middle part offers a short groove at least, and described short groove place is provided with two elasticity clamps; The sliding sleeve front end is a necking down, and the necking down front end has a baffle plate, and described baffle plate center is provided with a hole that syringe needle is stretched out;
The front end of described syringe is provided with a perpendicular end surface, and the cylindrical of syringe is provided with the elongated slot that cooperates with described elasticity clamp, and described elongated slot front portion is provided with a limiting plate, but described limiting plate holding is between described two elasticity clamps; Described syringe outer wall respectively is provided with a junction in the connector corresponding position with the elastic extension plate, and described connecting portion can be connected with the connector on the described elastic extension plate;
Described push rod is provided with a sliding sleeve unlocking board in the corresponding position with described sliding sleeve elastic extension plate, at least one is the inclined-plane for the opposite face of described sliding sleeve unlocking board and described sliding sleeve elastic extension plate, when the sliding sleeve unlocking board contacted with sliding sleeve elastic extension plate, the effect low sleeve unlocking board on the inclined-plane can make sliding sleeve elastic extension plate open to both sides slightly.
Described spring housing is located at outer the putting of the dress pin screw thread of described syringe, and is compressed between the perpendicular end surface of the baffle plate of described sliding sleeve and described syringe.
2, safety injector according to claim 1 is characterized in that: described syringe rear portion is provided with the resistance ring that is no less than two; Described syringe also includes a lock sleeve, and described lock sleeve front portion is the conical surface that inwardly shrinks and has elongated slot more than two, and cylindrical also is provided with a snap ring in the middle of it; Described lock sleeve is installed in syringe endoporus rear portion and is set on the described push rod;
Described push rod body is a crossed stiffened plate, comprises preceding crossed stiffened plate, middle crossed stiffened plate, step flaps and back crossed stiffened plate; The crossed stiffened plate overall dimensions is slightly larger than lock sleeve front end diameter of bore before described, and described middle crossed stiffened plate overall dimensions is less than lock sleeve front end diameter of bore, and described step flaps is at least one, and its external diameter is slightly larger than lock sleeve front end diameter of bore.
3, safety injector according to claim 2 is characterized in that: the described triangular in shape and cross section, a cross section that is provided with at syringe endoporus rear portion is trapezoid resistance ring; The cross section of preceding resistance ring is triangular in shape, and its internal diameter is slightly less than the syringe internal diameter, and angle is less between described preceding resistance ring front bevel and axis, and the angle between back bevel and axis is bigger; Back resistance ring cross section is trapezoidal, and angle is all bigger between its forward and backward inclined-plane and syringe axis, and the internal diameter of described back resistance ring is less than preceding resistance ring internal diameter; The front end face vertical axis of the snap ring of described lock sleeve, back bevel and axis angle are bigger, and the external diameter of snap ring equals the syringe diameter of bore, and the width of snap ring is slightly less than the width of forward and backward resistance interannular in the syringe; The rear end face of the snap ring of described lock sleeve is slightly larger than the rear end face distance of the front end face of described lock sleeve to described step flaps to the distance of described back resistance ring front bevel.
4, according to claim 1 or 2 or 3 described safety injectors, it is characterized in that: the draw-in groove hole of described connector on the elastic extension plate, offering, described connecting portion on syringe, be provided with the corresponding boss in described draw-in groove hole, described boss can be fastened in the described draw-in groove hole.
5, according to claim 1 or 2 or 3 described safety injectors, it is characterized in that: the connector of described elastic extension plate is one " T " font plate, described syringe end is provided with a bulge loop, the groove that with described " T " font plate cooperate of described connecting portion for offering on bulge loop, described " T " font plate can be fastened in the described groove.
6, according to claim 1 or 2 or 3 described safety injectors, it is characterized in that: the connector of described elastic extension plate is a hook-plate, and the connecting portion of described syringe is the rear end face of syringe, and described hook-plate can be fastened on the rear end face of syringe.
7, want described safety injector according to above-mentioned any right, it is characterized in that: the diameter of the endoporus of described piston is greater than push rod head union joint diameter, and its length is greater than push rod union joint gauge 0.5～5mm.
8, according to above-mentioned any described safety injector of claim, it is characterized in that: be equivalent to the lock sleeve front end face apart from the backward step plate on the crossed stiffened plate behind the described push rod and to snap ring rear end face distance one circular anti-slip plate be set, its external diameter is slightly less than lock sleeve rear end diameter of bore; One weak bonding pad is set on the crossed stiffened plate behind the described push rod, connects by two little joint pins of breaking that are centrosymmetric between its horizontal gusset, connect by the arrowband that can break between the vertical gusset.
9, according to above-mentioned any described safety injector of claim, it is characterized in that: be a transition inclined-plane or transition frustum between crossed stiffened plate and the preceding crossed stiffened plate in the described push rod, inclined-plane and axis angle are not less than 30 °
10, according to above-mentioned any described safety injector of claim, it is characterized in that: the end of the two elasticity clamps at the short groove of described sliding sleeve place is outstanding to the endoporus direction, and projecting height is slightly larger than the degree of depth of elongated slot on the syringe; The height of the boss of described syringe is less than the degree of depth in draw-in groove hole, and the width of described boss is less than the width in draw-in groove hole.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410039572 CN1654094A (en) | 2004-02-10 | 2004-02-10 | Safety syringe |
| PCT/CN2004/000350 WO2004091698A1 (en) | 2003-04-18 | 2004-04-14 | Safety syringe |
| US10/553,749 US7282042B2 (en) | 2003-04-18 | 2004-04-14 | Safety syringe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410039572 CN1654094A (en) | 2004-02-10 | 2004-02-10 | Safety syringe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1654094A true CN1654094A (en) | 2005-08-17 |
Family
ID=34892369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410039572 Pending CN1654094A (en) | 2003-04-18 | 2004-02-10 | Safety syringe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1654094A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100427157C (en) * | 2005-09-28 | 2008-10-22 | 山东威高集团医用高分子制品股份有限公司 | Self-destructive syringe |
| CN103212142A (en) * | 2013-04-28 | 2013-07-24 | 杭州市红十字会医院 | Needling prevention injector |
| CN103736175A (en) * | 2014-02-12 | 2014-04-23 | 刘友红 | Disposable puncture prevention syringe |
| CN109646297A (en) * | 2019-01-21 | 2019-04-19 | 杭州堃博生物科技有限公司 | Syringe and its lock piece |
| CN112618875A (en) * | 2021-02-09 | 2021-04-09 | 上海倍莱弗科技有限公司 | Safety positioning device for injector |
-
2004
- 2004-02-10 CN CN 200410039572 patent/CN1654094A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100427157C (en) * | 2005-09-28 | 2008-10-22 | 山东威高集团医用高分子制品股份有限公司 | Self-destructive syringe |
| CN103212142A (en) * | 2013-04-28 | 2013-07-24 | 杭州市红十字会医院 | Needling prevention injector |
| CN103736175A (en) * | 2014-02-12 | 2014-04-23 | 刘友红 | Disposable puncture prevention syringe |
| CN109646297A (en) * | 2019-01-21 | 2019-04-19 | 杭州堃博生物科技有限公司 | Syringe and its lock piece |
| CN112618875A (en) * | 2021-02-09 | 2021-04-09 | 上海倍莱弗科技有限公司 | Safety positioning device for injector |
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