CN101318040B - Improved barrel type push bar for needle whip-back type safety syringe and syringe thereof - Google Patents
Improved barrel type push bar for needle whip-back type safety syringe and syringe thereof Download PDFInfo
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- CN101318040B CN101318040B CN 200810111535 CN200810111535A CN101318040B CN 101318040 B CN101318040 B CN 101318040B CN 200810111535 CN200810111535 CN 200810111535 CN 200810111535 A CN200810111535 A CN 200810111535A CN 101318040 B CN101318040 B CN 101318040B
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- 238000007789 sealing Methods 0.000 claims abstract description 4
- 230000003044 adaptive effect Effects 0.000 claims description 29
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 230000008602 contraction Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 230000008878 coupling Effects 0.000 abstract 2
- 238000010168 coupling process Methods 0.000 abstract 2
- 238000005859 coupling reaction Methods 0.000 abstract 2
- 230000004048 modification Effects 0.000 description 10
- 238000012986 modification Methods 0.000 description 10
- 201000010099 disease Diseases 0.000 description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 206010011409 Cross infection Diseases 0.000 description 1
- 206010029803 Nosocomial infection Diseases 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005180 public health Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention relates to an improved barrel-type handspike used in pinhead retraction-type safe injector. The barrel-type handspike comprises a barrel body, a pinhead retraction trigger and a support. A sealing cushion is sheathed on the head of the barrel body, wherein, the pinhead retraction trigger is arranged at the front end of the barrel cavity of the barrel body; the support is arranged inthe barrel body, and the front end of the support supports the pinhead retraction trigger; the barrel body and the support are provided with a coupling structure which are adapted to each other, whenassembling, the support can be coupled in the barrel body by means of coming-away the ground; after coming away the coupling with the barrel body, under the action of pinhead retraction force, the support and the pinhead retraction trigger together move back so as to lead the support to retract to the barrel body or in a pin seat sleeve. The invention also relates to a retraction- type safe injector including an improved barrel-type handspike.
Description
Technical field
The present invention relates to a kind of medical apparatus and instruments, particularly a kind of improved barrel type push bar for needle retractable safety injector, and a kind of syringe that includes above-mentioned barrel type push bar.
Background technology
Syringe is often to need in the medical field and a large amount of medical apparatus and instruments that uses.If syringe is reused, just be easy to cause the propagation of disease between different patients, cause cross infection, jeopardize the public's health.Some collect used discarded disposable syringe, and again drop into the medical market, for huge hidden danger has been buried in diffusion and the propagation of numerous disease in order to seek unlawful interests.Simultaneously, the medical worker because syringe needle exposes, may stab medical worker or waste collection personnel after injection is complete, causes disease to infect or infection.
In order to stop syringe to be reused, it is namely being damaged after once using voluntarily, really accomplish and disposablely to use, and the syringe that prevents from the being used Accidental occurrence of stabbing, someone has proposed the technical scheme about the needle retraction type disposable syringe, and on this basis the barrel type push bar of syringe is improved, with the self-destruction that realizes syringe and the controllability of needle retractable.
Such as the ZL200520015704.2 Chinese invention patent, the new barrel type push bar that is used for needle retractable safety injector has been proposed, proposed simultaneously to use the safety injector of above-mentioned barrel type push bar, this technical scheme is controlled the support sheet by the urceolus of barrel type push bar and the matching relationship of inner core, and utilize the support sheet to control the retraction of the needle stand that pushes away post and get loose, thereby realize the controllability of the needle retractable of syringe when injection is complete, avoid simultaneously reusing, and eliminated because injecting complete rear syringe needle and be exposed to the risk that accident is easily stabbed in the outside.
Although this technical scheme can realize the controllability that the syringe needle of syringe bounces back afterwards in injection, but there is following defective in its technical scheme: the first, and the complicated structure of this barrel type push bar technical scheme, difficulty of processing is larger, assembly program is also relatively complicated, thereby processing cost is higher; The second, because the complicated structure of this barrel type push bar is difficult to be applicable to little milliliter syringe such as 1ml syringe.
Summary of the invention
The object of the invention is to overcome defects of the prior art, provide a kind of simple in structure, be easy to process assembling and can realize the barrel type push bar of syringe needle controllable type retraction, a kind of syringe that this barrel type push bar is housed is provided simultaneously.
For achieving the above object, the invention provides a kind of improved barrel type push bar for needle retractable safety injector, it comprises cylindrical shell, needle retractable trigger and support member, described cylindrical shell head cover has seal gasket, wherein, described needle retractable trigger is located at the front end in the cylinder chamber of cylindrical shell, and described support member is arranged in the described cylindrical shell, the described needle retractable trigger of its front end bearing, described cylindrical shell and described support member are provided with mutually adaptive snap-in structure.During assembling, support member releasably is connected in the cylindrical shell, and described support member can be with the backward displacement of described needle retractable trigger under the effect of needle retractable power, so that described needle retractable is to cylindrical shell or needle stand sleeve after the clamping of disengagement and cylindrical shell.
Described support member is the cylindrical body of a front end sealing, and described needle retractable trigger support is on the front end face of described support member.
Described support member can also be the cylindrical body of a front opening,, the described support sheet of the front end bearing of this cylindrical body, described needle retractable trigger support is on described support sheet.
Described needle retractable trigger is the post that pushes away of a closed front.After the assembling, the front end that pushes away post protrudes from outside the cylinder chamber opening and seal gasket of barrel front end, and ledge is the concordant tubular structure in end, or is the tubular structure that the end has vertical detent projection.
Have at least one opening on the barrel at described support member rear portion, the barrel of each opening tailing edge is provided with one along the elastic strip that axially extends forward of cylindrical body, described elastic strip outer wall is provided with first projection, and described the first projection is that hemispherical, triangle or top end face are other shapes on inclined-plane.The barrel of described cylindrical shell is having window with the adaptive position of described the first projection.During assembling, the first projection is bearing on the tailing edge of window, and protrudes from outside the window, thereby described support member releasably is connected in the cylindrical shell.
Described opening and window can be two that are oppositely arranged, and are equipped with an elastic strip in each opening, and the same position place is equipped with first projection on the outer wall of every elastic strip.
Described two relative windows are arranged on the barrel of cylindrical shell postmedian, and described support member comprises a base, two elastic strips and a T-shape support bar, the front end face of T-shape support bar be "+" type, " X " type,
Type or disc type, elastic strip and support bar all are arranged on the front end face of base, and along axially the extending forward of cylindrical shell, respectively are provided with first projection on the outer wall of two elastic strips, and the first projection is that hemispherical, triangle or top end face are other shapes on inclined-plane.The front end face of described support bar supports described needle retractable trigger.During assembling, the first projection is bearing on the tailing edge of window, and protrudes from outside the window, thereby support member releasably is connected in the cylindrical shell.
The inwall at described cylindrical shell rear portion is provided with the retaining ring of a circle projection so that described support member and described push away post be moved to backward make described needle retractable to cylindrical shell or the needle stand sleeve after by jam again on described retaining ring.
Also be provided with second projection on the outer wall of described elastic strip, the second projection is located at the rear of described the first projection, distance between the rear end face of the rear end face of the first projection and the second projection is equal to or greater than described support member and the described post that pushes away in order to make syringe needle can bounce back to needed backward shift length in cylindrical shell or the needle stand sleeve.The height of projection of the second projection is less than or equal to the height of projection of the first projection.During assembling, the first projection and the second projection are installed in the described window and protrude from outside the window, and the second projection is bearing on the tailing edge of described window, thereby support member releasably is connected in the cylindrical shell.
Have at least one window on the barrel of described cylindrical shell postmedian.The barrel of described support member postmedian with the adaptive position of each window on all have opening, the barrel in the forward position of opening is provided with one along the elastic strip that axially extends back of this cylindrical body, outer wall at elastic strip is provided with the first projection, and the position the when shape of this first projection, assembling is similar to aforementioned the first projection with effect.
The opening that arranges on the window that arranges on the barrel of described cylindrical shell and the barrel of support member can be symmetrical two, and described elastic strip and upper the first projection that arranges thereof also are respectively symmetrical two groups.On elastic strip, also be provided with the second projection that is positioned at the first projection rear, distance between the rear end face of the rear end face of described the second projection and the first projection, be equal to or greater than support member and the described post that pushes away in order to make syringe needle can bounce back to needed backward shift length in cylindrical shell or the needle stand sleeve, the height of projection of the second projection is equal to or less than the height of projection of the first projection, during assembling, the first projection and the second projection are installed in the window and protrude from outside the window, and the second projection is bearing on the tailing edge of window, thereby support member releasably is connected in the cylindrical shell.
Described support member can be connect by jacket casing behind a placket and and form.The front end of the rear end of described placket and described rear cylinder is respectively equipped with mutually adaptive socket join structure, and described opening is located on described rear cylinder and the barrel described placket belled position rear.
The external diameter at described rear cylinder front end and position described placket socket is less than the external diameter of other parts of rear cylinder, and adaptive with the internal diameter of described placket, and the position with described placket socket of described rear cylinder front end is provided with a locating piece.The barrel at the position that connects with described rear jacket casing of described front tube rear end is provided with locating slot or a locating hole adaptive with described locating piece.Described the first projection rear also is provided with second projection, and the height of projection of the first projection is more than or equal to the height of projection of the second projection, distance between the rear end face of the rear end face of the first projection and the second projection, more than or equal to support member and the described post that pushes away in order to make syringe needle can bounce back to needed backward shift length in cylindrical shell or the needle stand sleeve.During assembling, the first projection and the second projection are installed in the described window and protrude from outside the window, and the second projection is bearing on the tailing edge of window, thereby described support member releasably is connected in the cylindrical shell.
The present invention also comprises a protection sleeve, and described protection sleeve is formed by connecting by a thick cylinder and a thin cylinder.The internal diameter of thick cylinder is more than or equal to the syringe external diameter of described syringe, and the outer wall at described cylindrical shell rear portion is provided with a circle flange, and the internal diameter of thin cylinder and the external diameter of cylindrical shell are adaptive, and the inwall of thin cylinder is provided with the groove that a circle can engage with described flange.During assembling, protection sleeve is socketed on the rear end of cylindrical shell, fixes by engaging between groove and the flange, and makes thick cylinder surround engaging position between described cylindrical shell and the described support member.
Can replace described needle retractable trigger with a syringe needle supporting parts, described cylindrical shell exposes the tubular front end that an end is concordant or the end has vertical detent projection behind the suit seal gasket.
The present invention also provides a kind of needle retractable controllable safety injector, and this syringe comprises barrel type push bar of the present invention.
The present invention also provides a kind of needle retractable controllable safety injector, and this syringe comprises syringe, is fixed with the needle stand of syringe needle, needle stand sleeve, spring, O RunddichtringO and push rod, and wherein, described push rod can adopt any in the above-mentioned barrel type push bar.Described syringe is at the shoulder of its front end formation one to the axis direction contraction of syringe, extend forward a sleeve pipe from described shoulder again, sleeve pipe is provided with flange at the inwall with described shoulder connecting place, and the outer wall of sleeve pipe is provided with engaging, grafting or screw connection structure.Described needle stand is a tubular body, and there is a through hole centre, and syringe needle is fixed in the through hole of needle stand, and the rear end of needle stand is provided with a tubaeform base, and needle stand is installed in the sleeve pipe.Described O RunddichtringO is nested with on narrow of the tubaeform base of needle stand, and cooperates with flange on the internal surface of sleeve pipe, and needle stand releasably is fixedly mounted in the sleeve pipe.Described spring is nested with on needle stand, and its rear end is supported on the tubaeform base of needle stand.Described needle stand sleeve has an aft-opening cavity, the external diameter of its internal diameter and sleeve pipe is adaptive, the inwall of needle stand sleeve be provided with can with sleeve outer wall on engage, engaging, grafting or helicitic texture that grafting or helicitic texture cooperate, the closed front end of needle stand sleeve is provided with a pin hole.When the clamping of needle stand sleeve, peg graft or when being threaded on the sleeve pipe that needle stand is installed, syringe needle stretches out from described pin hole, the front end of spring is being pressed on the closed front end of needle stand sleeve top, and with the spring pre-pressing between the tubaeform base of this closed front end and needle stand.Described barrel type push bar is contained in the syringe, when barrel type push bar is pushed to the cylinder chamber end of syringe, the tubular front end of barrel type push bar promotes the O RunddichtringO and carries out integral body or local displacement, thereby get loose fixed relationship between needle stand and the sleeve pipe, simultaneously, the rear end of the syringe clamping relation of support member and cylindrical shell in the described barrel type push bar that gets loose, and discharge support member.
Described needle stand sleeve also can comprise first sleeve and second sleeve, the front end closure of the first sleeve also is provided with pin hole, the rear end inwall of the second sleeve is provided with flange, the second sleeve and the first sleeve are threaded connection, grafting or snap fit connect as one, and perhaps are fixed connection by bonding or ultrasonic bonding mode; Described O RunddichtringO is nested with on narrow of the tubaeform base of needle stand, and with the second sleeve rear end inwall on flange cooperate, needle stand releasably is fixedly mounted in the needle stand sleeve; Described spring is nested with on needle stand, and its rear end is supported on the tubaeform base of needle stand; Needle stand is installed in the needle stand sleeve, and syringe needle stretches out from the pin hole of the first barrel forward end, and the front end of spring is being pressed on the closed front end of the first sleeve top, and with the spring pre-pressing between the tubaeform base of this closed front end and needle stand; The needle stand sleeve is threaded connection with the sleeve pipe of syringe, grafting or snap fit releasably are connected.
The pin hole of described the first barrel forward end has inside flared structure, the front portion of described needle stand also is provided with the pyramidal structure that matches with described flared structure shape, after the assembling, the flared structure of described pin hole is by the fixedly needle stand that cooperatively interacts of the pyramidal structure with the needle stand front portion.
Description of drawings
The below will the present invention will be described by accompanying drawing, wherein:
Fig. 1 is the cutaway view of the embodiment 1 of barrel type push bar of the present invention;
Fig. 2 is the cutaway view of the embodiment 2 of barrel type push bar of the present invention;
Fig. 3 is the cutaway view that pushes away post among the embodiment 1-4 of barrel type push bar of the present invention;
Fig. 4 is the cutaway view of a support member, and this support member is applicable to the embodiment 1 of barrel type push bar of the present invention;
Fig. 5 is the axonometric chart of support member shown in Fig. 4;
Fig. 6 is the cutaway view of another support member, and this support member is applicable to the embodiment 1 of barrel type push bar of the present invention;
Fig. 7 is the cutaway view of another support member, and this support member is applicable to the embodiment 1 of barrel type push bar of the present invention;
Fig. 8 is the cutaway view of the cylindrical shell among the embodiment 1,2 and 4 of barrel type push bar of the present invention;
Fig. 9 is the cutaway view of the support member among the embodiment 1 of barrel type push bar of the present invention;
Figure 10 is the cutaway view of the cylindrical shell among the embodiment 1-3 of barrel type push bar of the present invention;
Figure 11 is the cutaway view of the support member among the embodiment 2 of barrel type push bar of the present invention;
Figure 12 is the cutaway view of the support member among the embodiment 4 of barrel type push bar of the present invention;
Figure 13 is the three-dimensional exploded view of support member shown in Figure 12;
Figure 14 is the axonometric chart of the support member among the embodiment 3 of barrel type push bar of the present invention;
Figure 15 is the axonometric chart of the support member among the embodiment 5 of barrel type push bar of the present invention;
Figure 16 is the cutaway view of the protection sleeve of barrel type push bar of the present invention;
Figure 17 is the cutaway view of the embodiment 1 of syringe of the present invention;
Figure 18 is the cutaway view of the embodiment 2 of syringe of the present invention;
Figure 19 is the cutaway view of the needle stand sleeve among the embodiment 2 of syringe of the present invention.
The specific embodiment
The invention provides a kind of improved barrel type push bar for needle retractable safety injector.Below by following exemplary embodiment barrel type push bar of the present invention is described.
Embodiment 1:
Fig. 1,3-10 and 16 illustrate the embodiment 1 of barrel type push bar of the present invention.This barrel type push bar comprises cylindrical shell 1, needle retractable trigger, support member 3 and a support sheet 4, and described cylindrical shell 1 head cover has seal gasket 5, and wherein, described needle retractable trigger is located at the front end in the cylinder chamber of cylindrical shell 1, and described support member 3 is arranged in the described cylindrical shell 1.Described support member 3 is the cylindrical body of a front opening, the described support sheet 4 of the front end bearing of this cylindrical body 3, and described needle retractable trigger support is on described support sheet 4.Described cylindrical shell 1 and described support member 3 are provided with mutually adaptive snap-in structure.During assembling, support member 3 releasably is connected in the cylindrical shell 1, and described support member 3 can be with the backward displacement of described needle retractable trigger, so that described needle retractable is to needle stand sleeve 19 under the effect of needle retractable power after the clamping of disengagement and cylindrical shell 1.
Described needle retractable trigger be a closed front push away post 2.After the assembling, the front end that pushes away post 2 protrudes from outside the cylinder chamber opening and seal gasket 5 of cylindrical shell 1 front end, and ledge is the concordant tubular structure in end.According to a modification of the present embodiment, described ledge also can be the tubular structure that the end has vertical detent projection.
Have two windows 101 on the barrel of described cylindrical shell 1 postmedian, the barrel of described support member 3 postmedians with the adaptive position of each window 101 on all have opening 302, the barrel in the forward position of opening 302 is provided with one along the elastic strip that axially extends back 6 of this cylindrical body, on the outer wall of every elastic strip 6, all be provided with the first projection 601 and the second projection 602, wherein, the first projection 601 is other shapes on inclined-plane for hemispherical, triangle or top end face.During assembling, the first projection 601 is bearing on the tailing edge of window 101, and protrudes from outside the window 101, thereby support member 3 releasably is connected in the cylindrical shell 1.The second projection 602 is located at the rear of described the first projection 601, distance between the rear end face of the rear end face of the first projection 601 and the second projection 602, be equal to or greater than described support member 3 and the described post 2 that pushes away in order to make syringe needle can bounce back to needle stand sleeve 19 interior needed backward shift lengths, the height of projection of the second projection 602 is less than or equal to the height of projection of the first projection 601.During assembling, the first projection 601 and the second projection 602 are installed in the described window 101 and protrude from outside the window 101, and the second projection 602 is bearing on the tailing edge of described window 101, thereby support member 3 releasably is connected in the cylindrical shell 1.According to a modification of the present embodiment, the distance between the rear end face of the rear end face of the first projection 601 and the second projection 602 can be equal to or greater than described support member 3 and the described post 2 that pushes away in order to make syringe needle can bounce back to cylindrical shell 1 interior needed backward shift length.
The inwall at described cylindrical shell 1 rear portion is provided with the retaining ring of a circle projection so that described support member 3 and described push away post 2 be moved to backward make described needle retractable to needle stand sleeve 19 interior rear by jam again on described retaining ring.
Described cartridge type pushes away this and also comprises a protection sleeve 9.Described protection sleeve 9 is formed by connecting by thick cylinder 901 and one a thin cylinder 902, and the internal diameter of thick cylinder 901 is more than or equal to the syringe external diameter of described syringe, and the outer wall at described cylindrical shell 1 rear portion is provided with a circle flange 104.The internal diameter of thin cylinder 902 and the external diameter of cylindrical shell 1 are adaptive, and the inwall of thin cylinder 902 is provided with the groove 903 that a circle can engage with described flange 104.During assembling, protection sleeve 9 is socketed on the rear end of cylindrical shell 1, fixes by engaging between groove 903 and the flange 104, and makes the thick cylinder 901 engaging positions that surround between described cylindrical shell 1 and the described support member 3.
According to a modification of the present embodiment, shown in Fig. 4,5 and 8,3 of described support members are provided with an opening 302, and the barrel of these opening 302 tailing edge is provided with one along the elastic strip 6 that axially extends forward of cylindrical body.Described elastic strip 6 outer walls are provided with first projection 601, and this first projection 601 is other shapes on inclined-plane for hemispherical, triangle or top end face.The barrel of described cylindrical shell 1 is having window 101 with the adaptive position of described the first projection 601.During assembling, the first projection 601 is bearing on the tailing edge of window 101, and protrudes from outside the window 101, thereby described support member 3 releasably is connected in the cylindrical shell 1.
Another modification according to the present embodiment, as shown in Figure 6, described opening 302 and window 101 are set to be relative two, be equipped with an elastic strip 6 that extends forward in each opening 302, be provided with the first projection 601 and the second projection 602 on this elastic strip 6, wherein, shape, relative position and the assembling position of described the first projection 601 and the second projection 602 are identical with foregoing description.
Embodiment 2:
Fig. 2,3,8,10,11 and 16 illustrates the embodiment 2 of barrel type push bar of the present invention.The main distinction of this embodiment and embodiment 1 is, described support member 3 is the cylindrical body of a front end sealing, and described needle retractable trigger support is on the front end face of described support member 3.One base 301 is connected on the rear end of described support member 3 in modes such as bonding, welding, rivet connect, are threaded.
Embodiment 3:
Fig. 3,10,14 and 16 illustrates the embodiment 3 of barrel type push bar of the present invention.The main distinction of this embodiment and previous embodiment is, described support member 3 comprises a base 301, two elastic strips 6 and a T-shape support bar 303.The front end face of T-shape support bar 303 be "+" type, " X " type,
Type or disc type.The front end face of described support bar 303 supports described needle retractable trigger.Elastic strip 6 and support bar 303 all are arranged on the front end face of base 301, and axially extending forward along cylindrical shell 1.Respectively be provided with first projection 601 and the second projection 602 on the outer wall of two elastic strips 6, wherein, shape, relative position and the assembling position of described the first projection 601 and the second projection 602 are identical with embodiment 1.
According to a modification of the present embodiment, the first projection 601 can only be set on elastic strip 6, this first projection 601 is other shapes on inclined-plane for hemispherical, triangle or top end face.During assembling, the first projection 601 is bearing on the tailing edge of window 101, and protrudes from outside the window 101, thereby support member 3 releasably is connected in the cylindrical shell 1.
Embodiment 4:
Fig. 3,5,8,12,13 and 16 illustrates the embodiment 4 of barrel type push bar of the present invention.The main distinction of this embodiment and previous embodiment is, described support member 3 is connect by jacket casing behind a placket and and forms, and the front end of the rear end of described placket and described rear cylinder is respectively equipped with mutually adaptive socket join structure.Described opening 302 is located on described rear cylinder and the barrel described placket belled position rear.
The external diameter at described rear cylinder front end and position described placket socket is less than the external diameter of other parts of rear cylinder, and adaptive with the internal diameter of described placket, and the position with described placket socket of described rear cylinder front end is provided with a locating piece 305.The barrel at the position that connects with described rear jacket casing of described front tube rear end is provided with locating slot or a locating hole 304 adaptive with described locating piece 305.Described support bar 3 is provided with first projection 601 and the second projection 602, and wherein, shape, relative position and the assembling position of described the first projection 601 and the second projection 602 are identical with embodiment 1.
Embodiment 5:
The main distinction of this embodiment and previous embodiment is, adopts support member shown in Figure 15.
Embodiment 6:
The main distinction of this embodiment and previous embodiment is, replaces described needle retractable trigger with a syringe needle supporting parts, and described cylindrical shell 1 exposes the concordant tubular front end in an end behind suit seal gasket 5.According to another modification of the present embodiment, the end of described tubular front end has vertical detent projection.
The present invention also provides a kind of retractable safety injector that comprises above-mentioned improved barrel type push bar, and this syringe can adopt above-mentioned any barrel type push bar and modification thereof.
The present invention also provides a kind of like this retractable safety injector, namely except adopting above-mentioned any barrel type push bar and modification thereof, also other parts of syringe is innovated.Below by following exemplary embodiment this syringe is described.
Embodiment 1:
Figure 17 illustrates the embodiment 1 of syringe of the present invention.Described syringe comprises syringe 17, is fixed with the needle stand 18 of syringe needle, needle stand sleeve 19, spring 20, O RunddichtringO 21 and push rod, wherein, described syringe 17 extends forward a sleeve pipe 1701 from described shoulder again at the shoulder of its front end formation one to the axis direction contraction of syringe 17.Sleeve pipe 1701 is provided with flange 1702 at the inwall with described shoulder connecting place, and the outer wall of sleeve pipe 1701 is provided with engaging, grafting or screw connection structure 1703.Described needle stand 18 is a tubular body, and there is a through hole centre, and syringe needle is fixed in the through hole of needle stand 18, and the rear end of needle stand 18 is provided with a tubaeform base, and needle stand 18 is installed in the sleeve pipe 1701.Described O RunddichtringO 21 is nested with on narrow of the tubaeform base of needle stand 18, and cooperates with flange 1702 on sleeve pipe 1701 inwalls, and needle stand 18 releasably is fixedly mounted in the sleeve pipe 1701.Described spring 20 is nested with on needle stand 18, and its rear end is supported on the tubaeform base of needle stand 18.Described needle stand sleeve 19 has an aft-opening cavity, the external diameter of its internal diameter and sleeve pipe 1701 is adaptive, the inwall of needle stand sleeve 19 be provided with can with sleeve pipe 1701 outer walls on engage, the engaging that grafting or helicitic texture 1703 cooperate, peg graft or helicitic texture 1901, the closed front end of needle stand sleeve 19 is provided with a pin hole, when 19 clampings of needle stand sleeve, peg graft or when being threaded on the sleeve pipe 1701 that needle stand 18 is installed, syringe needle stretches out from described pin hole, the front end of spring 20 is being pressed on the closed front end of needle stand sleeve 19 top, and with spring 20 pre-pressings between the tubaeform base of this closed front end and needle stand 18.Described barrel type push bar is contained in the syringe 17, when barrel type push bar is pushed to the cylinder chamber end of syringe 17, the tubular front end of barrel type push bar promotes O RunddichtringO 21 and carries out integral body or local displacement, thereby get loose fixed relationship between needle stand 18 and the sleeve pipe 1701, simultaneously, the rear end of the syringe 17 clamping relation of support member 3 and cylindrical shell 1 in the described barrel type push bar that gets loose, and discharge support member 3.
Embodiment 2:
Figure 18 and 19 illustrates the embodiment 2 of syringe of the present invention.The main distinction of this embodiment and embodiment 1 is, described needle stand sleeve 19 comprises first sleeve 1902 and second sleeve 1903, the front end closure of the first sleeve 1902 also is provided with pin hole, the rear end inwall of the second sleeve 1903 is provided with flange 1904, the second sleeve 1903 and the first sleeve 1902 are threaded connection, grafting or snap fit connect as one, and perhaps are fixed connection by bonding or ultrasonic bonding mode.Described O RunddichtringO 21 is nested with on narrow of the tubaeform base of needle stand 18, and with the second sleeve 1903 rear end inwalls on flange 1904 cooperate, needle stand 18 releasably is fixedly mounted in the needle stand sleeve 19.Described spring 20 is nested with on needle stand 18, and its rear end is supported on the tubaeform base of needle stand 18.Needle stand 18 is installed in the needle stand sleeve 19, and syringe needle stretches out from the pin hole of the first sleeve 1902 front ends, and the front end of spring 20 is being pressed on the closed front end of the first sleeve 1902 top, and with spring 20 pre-pressings between the tubaeform base of this closed front end and needle stand 18.Needle stand sleeve 19 is threaded connection with the sleeve pipe 1701 of syringe 17, grafting or snap fit releasably are connected.
The pin hole of described the first sleeve 1902 front ends has inside flared structure, the front portion of described needle stand 18 also is provided with the pyramidal structure that matches with described flared structure shape, after the assembling, the flared structure of described pin hole is by the fixedly needle stand 18 that cooperatively interacts of the pyramidal structure with needle stand 18 front portions.
Although below only described some exemplary embodiments, what those skilled in the art will easily recognize is, not in the situation of the technology contents that breaks away from essence novelty of the present invention and advantage, above-mentioned exemplary embodiment can have multiple modification.Therefore, all such modification all should be included in subsequently the claim limited range of the present invention.
Claims (20)
1. improved barrel type push bar for needle retractable safety injector, comprise cylindrical shell (1), needle retractable trigger and support member (3), described cylindrical shell (1) head cover has seal gasket (5), it is characterized in that, described needle retractable trigger is located at the front end in the cylinder chamber of cylindrical shell (1); Described support member (3) is arranged in the described cylindrical shell (1), the described needle retractable trigger of its front end bearing; Described cylindrical shell (1) and described support member (3) are provided with mutually adaptive snap-in structure, and during assembling, support member (3) releasably is connected in the cylindrical shell (1); Described support member (3) is after the clamping of disengagement and cylindrical shell (1), under the effect of needle retractable power with the backward displacement of described needle retractable trigger, so that described needle retractable is to cylindrical shell (1) or needle stand sleeve (19), and described support member (3) is not admitted described needle retractable trigger and described syringe needle.
2. the barrel type push bar for needle retractable safety injector as claimed in claim 1, it is characterized in that, described support member (3) is the cylindrical body of a front end sealing, and described needle retractable trigger support is on the front end face of described support member (3).
3. the barrel type push bar for needle retractable safety injector as claimed in claim 1, it is characterized in that, also comprise a support sheet (4), described support member (3) is the cylindrical body of a front opening, the described support sheet of the front end bearing of this cylindrical body (3) (4), described needle retractable trigger support is on described support sheet (4).
4. the barrel type push bar that is used for as claimed in claim 2 or claim 3 needle retractable safety injector, it is characterized in that, described needle retractable trigger be a closed front push away post (2), after the assembling, the front end that pushes away post (2) protrudes from outside the cylinder chamber opening and seal gasket (5) of cylindrical shell (1) front end, and ledge is the concordant tubular structure in end, or is the tubular structure that the end has vertical detent projection.
5. the barrel type push bar for needle retractable safety injector as claimed in claim 4, it is characterized in that, have at least one opening (302) on the barrel at described support member (3) rear portion, the barrel of each opening (302) tailing edge is provided with one along the elastic strip (6) that axially extends forward of cylindrical body, described elastic strip (6) outer wall is provided with first projection (601), and described the first projection (601) is that hemispherical, triangle or top end face are other shapes on inclined-plane; The barrel of described cylindrical shell (1) is having window (101) with the adaptive position of described the first projection (601); During assembling, the first projection (601) is bearing on the tailing edge of window (101), and protrudes from outside the window (101), thereby described support member (3) releasably is connected in the cylindrical shell (1).
6. the barrel type push bar for needle retractable safety injector as claimed in claim 5, it is characterized in that, described opening (302) and window (101) are two that are oppositely arranged, be equipped with an elastic strip (6) in each opening (302), the same position place is equipped with first projection (601) on the outer wall of every elastic strip (6).
7. the barrel type push bar for needle retractable safety injector as claimed in claim 1, it is characterized in that, described needle retractable trigger be a closed front push away post (2), after the assembling, the front end that pushes away post (2) protrudes from outside the cylinder chamber opening and seal gasket (5) of cylindrical shell (1) front end, and ledge is the concordant tubular structure in end, or is the tubular structure that the end has vertical detent projection; The barrel of described cylindrical shell (1) postmedian is provided with two relative windows (101); Described support member (3) comprises a base (301), two elastic strips (6) and a T-shape support bar (303), the front end face of T-shape support bar (303) be "+" type, " X " type,
Type or disc type, elastic strip (6) and support bar (303) all are arranged on the front end face of base (301), and axially extending forward along cylindrical shell (1), respectively be provided with first projection (601) on the outer wall of two elastic strips (6), the first projection (601) is that hemispherical, triangle or top end face are other shapes on inclined-plane; The front end face of described support bar (303) supports described needle retractable trigger; During assembling, the first projection (601) is bearing on the tailing edge of window (101), and protrudes from outside the window (101), thereby support member (3) releasably is connected in the cylindrical shell (1).
8. the barrel type push bar for needle retractable safety injector as claimed in claim 6, it is characterized in that, the inwall at described cylindrical shell (1) rear portion is provided with the retaining ring of a circle projection so that described support member (3) and described push away post (2) be moved to backward make described needle retractable to cylindrical shell (1) or the needle stand sleeve (19) afterwards by jam again on described retaining ring.
9. the barrel type push bar for needle retractable safety injector as claimed in claim 6, it is characterized in that, also be provided with second projection (602) on the outer wall of described elastic strip (6), the second projection (602) is located at the rear of described the first projection (601), distance between the rear end face of the rear end face of the first projection (601) and the second projection (602), be equal to or greater than described support member (3) and the described post (2) that pushes away in order to make syringe needle can bounce back to needed backward shift length in cylindrical shell (1) or the needle stand sleeve (19), the height of projection of the second projection (602) is less than or equal to the height of projection of the first projection (601), during assembling, the first projection (601) and the second projection (602) are installed in the described window (101) and protrude from outside the window (101), the second projection (602) is bearing on the tailing edge of described window (101), thereby support member (3) releasably is connected in the cylindrical shell (1).
10. the barrel type push bar for needle retractable safety injector as claimed in claim 4 is characterized in that, has at least one window (101) on the barrel of described cylindrical shell (1) postmedian; The barrel of described support member (3) postmedian with the adaptive position of each window (101) on all have opening (302), the barrel in the forward position of opening (302) is provided with one along the elastic strip that axially extends back (6) of this cylindrical body, outer wall at elastic strip (6) is provided with the first projection (601), the first projection (601) is hemispherical, triangle or top end face are other shapes on inclined-plane, during assembling, the first projection (601) is bearing on the tailing edge of window (101), and protrude from outside the window (101), thereby support member (3) releasably is connected in the cylindrical shell (1).
11. the barrel type push bar for needle retractable safety injector as claimed in claim 10, it is characterized in that, the opening (302) that arranges on the window (101) that arranges on the barrel of described cylindrical shell (1) and the barrel of support member (3) is symmetrical two, and described elastic strip (6) and upper the first projection (601) that arranges thereof also are respectively symmetrical two groups; On elastic strip (6), also be provided with the second projection (602) that is positioned at the first projection (601) rear, distance between the rear end face of the rear end face of described the second projection (602) and the first projection (601), be equal to or greater than support member (3) and the described post (2) that pushes away in order to make syringe needle can bounce back to needed backward shift length in cylindrical shell (1) or the needle stand sleeve (19), the height of projection of the second projection (602) is equal to or less than the height of projection of the first projection (601), during assembling, the first projection (601) and the second projection (602) are installed in the window (101) and protrude from outside the window (101), and the second projection (602) is bearing on the tailing edge of window (101), thereby support member (3) releasably is connected in the cylindrical shell (1).
12. the barrel type push bar for needle retractable safety injector as claimed in claim 5 is characterized in that, described support member (3) is connect by jacket casing behind a placket and and forms; The front end of the rear end of described placket and described rear cylinder is respectively equipped with mutually adaptive socket join structure; Described opening (302) is located on described rear cylinder and the barrel described placket belled position rear.
13. the barrel type push bar for needle retractable safety injector as claimed in claim 12, it is characterized in that, the external diameter at described rear cylinder front end and position described placket socket is less than the external diameter of other parts of rear cylinder, and adaptive with the internal diameter of described placket, the position with described placket socket of described rear cylinder front end is provided with a locating piece (305); The barrel at the position that connects with described rear jacket casing of described front tube rear end is provided with locating slot or a locating hole (304) adaptive with described locating piece (305); Described the first projection (601) rear also is provided with second projection (602), and the height of projection of the first projection (601) is more than or equal to the height of projection of the second projection (602), distance between the rear end face of the rear end face of the first projection (601) and the second projection (602), more than or equal to support member (3) and the described post (2) that pushes away in order to make syringe needle can bounce back to needed backward shift length in cylindrical shell (1) or the needle stand sleeve (19); During assembling, the first projection (601) and the second projection (602) are installed in the described window (101) and protrude from outside the window (101), and the second projection (602) is bearing on the tailing edge of window (101), thereby described support member (3) releasably is connected in the cylindrical shell (1).
14. the barrel type push bar for needle retractable safety injector as claimed in claim 11, it is characterized in that, also comprise a protection sleeve (9), described protection sleeve (9) is formed by connecting by a thick cylinder (901) and a thin cylinder (902); The internal diameter of thick cylinder (901) is more than or equal to the syringe external diameter of described syringe; The outer wall at described cylindrical shell (1) rear portion is provided with a circle flange (104); The internal diameter of thin cylinder (902) and the external diameter of cylindrical shell (1) are adaptive; the inwall of thin cylinder (902) is provided with the groove (903) that a circle can engage with described flange (104); during assembling; protection sleeve (9) is socketed on the rear end of cylindrical shell (1); fix by engaging between groove (903) and the flange (104), and make thick cylinder (901) surround engaging position between described cylindrical shell (1) and the described support member (3).
15. such as claim 1,2 or 3 described barrel type push bars for needle retractable safety injector, it is characterized in that, replace described needle retractable trigger with a syringe needle supporting parts, described cylindrical shell (1) exposes the tubular front end that an end is concordant or the end has vertical detent projection behind suit seal gasket (5).
16. needle retractable controllable safety injector, comprise syringe (17), be fixed with needle stand (18), needle stand sleeve (19), spring (20), O RunddichtringO (21) and the push rod of syringe needle, it is characterized in that, described push rod adopts barrel type push bar as claimed in claim 14; Described syringe (17) is at the shoulder of its front end formation one to the axis direction contraction of syringe (17), extend forward a sleeve pipe (1701) from described shoulder again, sleeve pipe (1701) is provided with flange (1702) at the inwall with described shoulder connecting place, and the outer wall of sleeve pipe (1701) is provided with engaging, grafting or screw connection structure (1703); Described needle stand (18) is a tubular body, and there is a through hole centre, and syringe needle is fixed in the through hole of needle stand (18), and the rear end of needle stand (18) is provided with a tubaeform base, and needle stand (18) is installed in the sleeve pipe (1701); Described O RunddichtringO (21) is nested with on narrow of the tubaeform base of needle stand (18), and cooperate with flange (1702) on sleeve pipe (1701) inwall, needle stand (18) releasably is fixedly mounted in the sleeve pipe (1701); Described spring (20) is nested with on needle stand (18), and its rear end is supported on the tubaeform base of needle stand (18); Described needle stand sleeve (19) has an aft-opening cavity, the external diameter of its internal diameter and sleeve pipe (1701) is adaptive, the inwall of needle stand sleeve (19) be provided with can with sleeve pipe (1701) outer wall on engage, the engaging that grafting or helicitic texture (1703) cooperate, peg graft or helicitic texture (1901), the closed front end of needle stand sleeve (19) is provided with a pin hole, when needle stand sleeve (19) clamping, peg graft or be threaded in the sleeve pipe (1701) that needle stand (18) are installed when upper, syringe needle stretches out from described pin hole, the front end of spring (20) is being pressed on the closed front end of needle stand sleeve (19) top, and with spring (20) pre-pressing between the tubaeform base of this closed front end and needle stand (18); Described barrel type push bar is contained in the syringe (17), when barrel type push bar is pushed to the cylinder chamber end of syringe (17), the tubular front end of barrel type push bar promotes O RunddichtringO (21) and carries out integral body or local displacement, thereby the fixed relationship between the needle stand that gets loose (18) and the sleeve pipe (1701), simultaneously, the rear end of syringe (17) the clamping relation of support member (3) and cylindrical shell (1) in the described barrel type push bar that gets loose, and discharge support member (3).
17. needle retractable controllable safety injector, comprise syringe (17), be fixed with needle stand (18), needle stand sleeve (19), spring (20), O RunddichtringO (21) and the push rod of syringe needle, it is characterized in that, described push rod adopts barrel type push bar as claimed in claim 14; Described syringe (17) extends forward a sleeve pipe (1701) from described shoulder again at the shoulder of its front end formation one to the axis direction contraction of syringe (17); Described needle stand (18) is a tubular body, and there is a through hole centre, and syringe needle is fixed in the through hole of needle stand (18), and the rear end of needle stand (18) is provided with a tubaeform base; Described needle stand sleeve (19) comprises first sleeve (1902) and second sleeve (1903), the front end closure of the first sleeve (1902) also is provided with pin hole, the rear end inwall of the second sleeve (1903) is provided with flange (1904), the second sleeve (1903) and the first sleeve (1902) are threaded connection, grafting or snap fit connect as one, and perhaps are fixed connection by bonding or ultrasonic bonding mode; Described O RunddichtringO (21) is nested with on narrow of the tubaeform base of needle stand (18), and with the second sleeve (1903) rear end inwall on flange (1904) cooperate, needle stand (18) releasably is fixedly mounted in the needle stand sleeve (19); Described spring (20) is nested with on needle stand (18), and its rear end is supported on the tubaeform base of needle stand (18); Needle stand (18) is installed in the needle stand sleeve (19), syringe needle stretches out from the pin hole of the first sleeve (1902) front end, the first sleeve (1902) closed front end top pressing the front end of spring (20), and with spring (20) pre-pressing between the tubaeform base of this closed front end and needle stand (18); Needle stand sleeve (19) is threaded connection with the sleeve pipe (1701) of syringe (17), grafting or snap fit releasably are connected; Described barrel type push bar is contained in the syringe (17), when barrel type push bar is pushed to the cylinder chamber end of syringe (17), tubular front end on the barrel type push bar promotes O RunddichtringO (21) and carries out integral body or local displacement, thereby the fixed relationship between the needle stand that gets loose (18) and the needle stand sleeve (19), simultaneously, the rear end of syringe (17) the clamping relation of support member (3) and cylindrical shell (1) in the barrel type push bar that gets loose, and discharge support member (3).
18. needle retractable controllable safety injector as claimed in claim 17, it is characterized in that, have at least one opening (302) on the barrel at described support member (3) rear portion, the barrel of each opening (302) tailing edge is provided with one along the elastic strip (6) that axially extends forward of cylindrical body, described elastic strip (6) outer wall is provided with first projection (601), and described the first projection (601) is that hemispherical, triangle or top end face are other shapes on inclined-plane; The barrel of described cylindrical shell (1) is having window (101) with the adaptive position of described the first projection (601); During assembling, the first projection (601) is bearing on the tailing edge of window (101), and protrudes from outside the window (101), thereby described support member (3) releasably is connected in the cylindrical shell (1);
Described support member (3) is connect by jacket casing behind a placket and and forms; The front end of the rear end of described placket and described rear cylinder is respectively equipped with mutually adaptive socket join structure; Described opening (302) is located on described rear cylinder and the barrel described placket belled position rear;
The external diameter at described rear cylinder front end and position described placket socket is less than the external diameter of other parts of rear cylinder, and adaptive with the internal diameter of described placket, and the position with described placket socket of described rear cylinder front end is provided with a locating piece (305); The barrel at the position that connects with described rear jacket casing of described front tube rear end is provided with locating slot or a locating hole (304) adaptive with described locating piece (305); Described the first projection (601) rear also is provided with second projection (602), and the height of projection of the first projection (601) is more than or equal to the height of projection of the second projection (602), distance between the rear end face of the rear end face of the first projection (601) and the second projection (602), more than or equal to support member (3) and the described post (2) that pushes away in order to make syringe needle can bounce back to needed backward shift length in cylindrical shell (1) or the needle stand sleeve (19); During assembling, the first projection (601) and the second projection (602) are installed in the described window (101) and protrude from outside the window (101), and the second projection (602) is bearing on the tailing edge of window (101), thereby described support member (3) releasably is connected in the cylindrical shell (1);
The pin hole of described the first sleeve (1902) front end has inside flared structure, the front portion of described needle stand (18) also is provided with the pyramidal structure that matches with described flared structure shape, after the assembling, the flared structure of described pin hole by with the anterior pyramidal structure of needle stand (18) the fixedly needle stand (18) that cooperatively interacts.
19. needle retractable controllable safety injector as claimed in claim 17, it is characterized in that, have at least one opening (302) on the barrel at described support member (3) rear portion, the barrel of each opening (302) tailing edge is provided with one along the elastic strip (6) that axially extends forward of cylindrical body, described elastic strip (6) outer wall is provided with first projection (601), and described the first projection (601) is that hemispherical, triangle or top end face are other shapes on inclined-plane; The barrel of described cylindrical shell (1) is having window (101) with the adaptive position of described the first projection (601); During assembling, the first projection (601) is bearing on the tailing edge of window (101), and protrudes from outside the window (101), thereby described support member (3) releasably is connected in the cylindrical shell (1);
Described opening (302) and window (101) are two that are oppositely arranged, be equipped with an elastic strip (6) in each opening (302), the same position place is equipped with first projection (601) on the outer wall of every elastic strip (6);
The inwall at described cylindrical shell (1) rear portion is provided with the retaining ring of a circle projection so that described support member (3) and described push away post (2) be moved to backward make described needle retractable to cylindrical shell (1) or the needle stand sleeve (19) afterwards by jam again on described retaining ring;
The pin hole of described the first sleeve (1902) front end has inside flared structure, the front portion of described needle stand (18) also is provided with the pyramidal structure that matches with described flared structure shape, after the assembling, the flared structure of described pin hole by with the anterior pyramidal structure of needle stand (18) the fixedly needle stand (18) that cooperatively interacts.
20. a needle retractable controllable safety injector is characterized in that, comprises a barrel type push bar according to claim 15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810111535 CN101318040B (en) | 2008-06-05 | 2008-06-05 | Improved barrel type push bar for needle whip-back type safety syringe and syringe thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810111535 CN101318040B (en) | 2008-06-05 | 2008-06-05 | Improved barrel type push bar for needle whip-back type safety syringe and syringe thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101318040A CN101318040A (en) | 2008-12-10 |
| CN101318040B true CN101318040B (en) | 2013-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810111535 Active CN101318040B (en) | 2008-06-05 | 2008-06-05 | Improved barrel type push bar for needle whip-back type safety syringe and syringe thereof |
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| Country | Link |
|---|---|
| CN (1) | CN101318040B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101480511B (en) * | 2009-02-08 | 2011-10-05 | 浙江康康医疗器械有限公司 | Disposable safety syringe with syringe needle capable of automatically retracting |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5171300A (en) * | 1988-02-01 | 1992-12-15 | Medtech Group, Inc. | Disposable hypodermic syringe |
| US5997512A (en) * | 1998-03-04 | 1999-12-07 | Shaw; Thomas J. | Retractable dental syringe |
| CN2486160Y (en) * | 2001-04-13 | 2002-04-17 | 双鸽集团有限公司 | Safety seld damage disposable aseptic syringe |
| CN1748807A (en) * | 2005-04-26 | 2006-03-22 | 刘文杰 | Barrel plunger for needle retractable safety syringes and needle retractable safety syringes |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6706015B2 (en) * | 2002-05-07 | 2004-03-16 | Medexel Korea | Safety syringe |
-
2008
- 2008-06-05 CN CN 200810111535 patent/CN101318040B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5171300A (en) * | 1988-02-01 | 1992-12-15 | Medtech Group, Inc. | Disposable hypodermic syringe |
| US5997512A (en) * | 1998-03-04 | 1999-12-07 | Shaw; Thomas J. | Retractable dental syringe |
| CN2486160Y (en) * | 2001-04-13 | 2002-04-17 | 双鸽集团有限公司 | Safety seld damage disposable aseptic syringe |
| CN1748807A (en) * | 2005-04-26 | 2006-03-22 | 刘文杰 | Barrel plunger for needle retractable safety syringes and needle retractable safety syringes |
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|---|---|
| CN101318040A (en) | 2008-12-10 |
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Application publication date: 20081210 Assignee: BEIJING WANTEFU MEDICAL DEVICES CO., LTD. Assignor: Liu Wenjie Contract record no.: 2014990000407 Denomination of invention: Improved barrel type push bar for needle whip-back type safety syringe and syringe thereof Granted publication date: 20131023 License type: Exclusive License Record date: 20140617 |
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