CN100581606C - Safety cylinder of injector - Google Patents
Safety cylinder of injector Download PDFInfo
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- CN100581606C CN100581606C CN200510108567A CN200510108567A CN100581606C CN 100581606 C CN100581606 C CN 100581606C CN 200510108567 A CN200510108567 A CN 200510108567A CN 200510108567 A CN200510108567 A CN 200510108567A CN 100581606 C CN100581606 C CN 100581606C
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- needle
- pliability
- inner barrel
- outer cylinder
- needle assembly
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Abstract
A high-safety injector features that under the action of the negative pressure in internal tube, the needle module can be automatically withdrawn in the internal tube. It is composed of external tube, flexible holder of needle module, flexible piston, internal tube, needle module, pressure-resistant structure, and flexible enclosed body. Its working process is also disclosed.
Description
Technical field
The present invention relates to a kind of by utilizing the mode of low-pressure suction, in the rapid safety syringe-drum that syringe needle is recycled to safety needle, particularly a kind of replaceable syringe needle in the syringe in the intact back of drug injection.
Background technology
Fig. 1 is the structural representation of conventional syringes.The syringe cylinder structure 10 of conventional syringes comprises: there is scale on the surface and inner outer cylinder body 1002 that can ccontaining medicament; Push rod 1004 with pliability rubber piston part 1043; And needle assembly 1003.Outer cylinder body 1002 front ends have opening (expression) in the drawings, can allow 1030 li needle assemblys 1003 with female thread (expression in the drawings) of needle stand, screw togather from the front end of outer cylinder body 1002.The rear end of entry needle 1031 penetrates needle stand 1030 and communicates with outer cylinder body 1002 inner spaces.And the rear end of outer cylinder body 1002 has the bigger opening of a sectional area 1024, can allow push rod 1004 insert the inside of outer cylinder body 1002.Pliability rubber piston part 1043 external diameters are a bit larger tham the internal diameter of outer cylinder body 1002, in this, when push rod 1004 being exerted pressure by the rear, medicament can be extruded (or apply pulling force in push rod 1004 rears, and the pin mouth of medicament by entry needle 1031 sucked by the external world) by the pin mouth of entry needle 1031.
When needle cylinder injection finishes, medical personnel reclaim after must needle assembly 1003 being put needle guard with staff.In case careless manipulation promptly may be because of carelessness by needle sting, and has increased the probability that catches.Therefore, many medical device dealers are devoted to develop the safety syringe-drum that does not need staff to reclaim syringe needle, make medical personnel can reduce infected chance.Safety syringe-drum uses the inner barrel of an inner hollow to replace the push rod of conventional syringes usually, makes the inner gravitation that produces of inner barrel by a mechanism, so that after injection is finished syringe needle is received in inner barrel automatically.For example, the U.S. the 5th, 395, No. 337 patent has disclosed a kind of safety needle structure, and it utilizes the mode of anchor clamps clipping to clamp syringe needle, and passes through the elastic force of inner barrel inner spring, when injection finishes, syringe needle can be retracted within the inner barrel automatically, and reach the purpose of recovery.
How to reclaim syringe needle automatically and be one of important issue of research and development safety syringe-drum, it relates to and improves effective utilization and reduce manufacturing cost, and above-mentioned United States Patent (USP) utilizes spring to provide pulling force to be a solution wherein syringe needle is reclaimed only.Yet, the design of spring is set in inner barrel, when use little as the syringe of 1cc, 2cc on the time, will cause the difficulty of making on assembling.Moreover the Generally Recognized as safe syringe more has an inconvenience, is that its needle assembly is fixed on the syringe usually when manufacturing sells, and can't arbitrarily takes out replacing.Therefore, when the syringe needle of safety syringe-drum has problem and can't use the time, the syringe that must directly renew, and can't only replace with new needle assembly, this will increase the medical treatment cost of medical institutes.
Summary of the invention
In illustrating in view of the aforementioned technical background, the shortcoming of conventional syringes and Generally Recognized as safe syringe, the present invention proposes a kind of structure of safety syringe-drum, to solve above-mentioned problems.
One of purpose of the present invention is to provide a kind of structure of safety syringe-drum, by the intravital low-pressure suction active force of inner core, needle assembly reclaimed automatically is hidden among the inner barrel.Another object of the present invention then provides a kind of structure that can freely change the safety syringe-drum of syringe needle, needle assembly, can avoid the conventional security syringe but must change whole the medical treatment that syringe caused waste problem because of syringe needle damages.
A further object of the present invention then provides the needle assembly structure of multiple safety syringe-drum, can freely dismantle and replace and be installed on the disclosed safety syringe-drum of the present invention.
For reaching above-mentioned purpose, the element of safety syringe-drum provided by the invention comprises: outer cylinder body, pliability bearing, pliability piston, inner barrel, needle assembly, compressive resistance structure and pliability obturator.Wherein, outer cylinder body has a hollow stack shell, and the front and back end has a front opening and an open rearward end respectively, and the sectional area of front opening is less than this open rearward end sectional area; And the connecting support that is positioned at hollow stack shell front end, front opening communicates with stack shell through connecting support.The pliability bearing has the through hole of front and back trend and is equipped in this outer cylinder body.Needle assembly comprises needle body and needle stand, and it is mounted on the front end of outer cylinder body, and wherein needle body passes connecting support and exposes to outer cylinder body.It is a big perforation than needle assembly that the inner barrel front end has a sectional area, inner wall surface thereof forms the narrower convergent part of an internal diameter near the front end place, inner barrel is located in the outer cylinder body, moves between inner barrel front end convergence pliability bearing position and this inner barrel front end are away from a position of this bearing.The compressive resistance structure has a cervical region and a bond sites in the front end of compressive resistance structure, and the counteracting force of opposing medicament slips among the inner barrel to prevent the pliability obturator when injection medicament.The pliability obturator, combine with the compressive resistance structure and make the linking part of its compressive resistance structure expose to the pliability obturator, and pliability obturator butt is urgent in the radially convergent part of this inner barrel, and close the perforation of this inner barrel front end, make and seal an air pressure that is lower than the safety syringe-drum outside in the stack shell of inner barrel up for safekeeping.
When reclaiming safety syringe-drum,, be positioned at pliability and seal that the linking part of intravital compressive resistance structure moves forward and combine, and the resistance to compression function of compressive resistance structure is removed with the needle stand of needle assembly when inner barrel front end convergence pliability bearing to a predeterminable range.Inner barrel pushes against to the pliability bearing, combination with liberation needle assembly and pliability bearing, and the pliability obturator is subjected to a counteracting force of needle assembly, with the bonding state of the convergent part of liberation pliability obturator and inner barrel, pliability obturator and needle assembly are subjected to the interior low-pressure suction of inner barrel stack shell and in the interior withdrawal inner barrel stack shell afterwards.
The safety syringe-drum that cooperates above the present invention to propose, the present invention more provides multiple removable needle assembly.The needle assembly of one embodiment has needle body and entry needle two parts, and wherein needle body has a Handheld Division, and the coupler construction that is arranged at the needle assembly both sides is to screw in the blocking needle assembly in the outer cylinder body front end.Before safety syringe-drum is also injected, when desire is changed syringe needle, be about to needle assembly outward the direction of barrel front end opening take out to external rotation, then needle assembly can break away from connecting support, and then, take out needle assembly to change the step of syringe needle along the outer cylinder body front opening.
Description of drawings
Fig. 1 is the rough schematic according to the syringe cylinder structure of conventional art;
Fig. 2 A is disclosed technology according to the present invention, the cutaway view of safety syringe structure;
Fig. 2 B to Fig. 2 F is the combination sectional structure sketch map of disclosed first preferred embodiment according to the present invention, illustrates from needle assembly to combine with safety syringe-drum and needle assembly inwardly sucks back each assembly relevant position variation relation figure the process that is placed in inner barrel;
Fig. 3 A to Fig. 3 E is the second preferred embodiment structural representation of the safety syringe-drum of the replaceable syringe needle of exposure the present invention, and needle assembly with coupler construction and the bonded process sketch map of safety syringe-drum with connecting support are described;
Fig. 4 A to Fig. 4 E represents the structural representation of a time preferred embodiment of the safety syringe-drum of the disclosed replaceable syringe needle of the present invention, and the needle assembly with needle guard and the bonded process sketch map of safety syringe-drum of no connecting support be describeds;
Fig. 5 A to Fig. 5 C is the another preferred embodiment of the disclosed safety syringe-drum of the present invention, and the needle assembly and the bonded process sketch map of safety syringe-drum that have than the hour hand cover are described;
Fig. 6 A to Fig. 6 C represents a preferred embodiment again of the safety syringe-drum of the disclosed replaceable syringe needle of the present invention, and needle body and the bonded process sketch map of safety syringe-drum with screw thread form are described.
Symbol description among the figure
2 outer cylinder bodies, 20 outer cylinder body stack shells
21 front ends, 22 rear ends
210 front openings, 212 connecting supports
220 open rearward end
2100 slide rails, 2110 depressed parts
3 pliability bearings, 31 through holes
33 inverted U piston parts, 330 screw threads
The annulus that 4 pliability pistons 42 cave inward
5 inner barrels, 50 inner barrel stack shells
51 front ends, 510 front openings
52 rear ends, 520 open rearward end
53 convergent parts, 54 cyclic lugs
6 needle assemblys, 60 needle stands
62 entry needles, 63 front ends
7 crushing resistance structures, 71 linking parts
72 heads, 73 cervical regions
8 pliability obturators
9 tail-hoods
10 syringe cylinder structures
1002 outer cylinder bodies, 1024 open rearward end
1003 needle assemblys, 1031 entry needles
1004 push rods, 1043 pliability rubber piston parts
3120 like funnel shaped sunk structure 3140 Handheld Divisions
3160 injection needles, 3200 tracks
Groove on 3210 motion tracks, 3220 tracks
The first half of needle assembly 4010 needle assemblys of 4000 tool needle guards
4020 Handheld Divisions, 4100 needle guards
4110 coupler constructions, 4200 needle bodies
4210 like funnel shaped sunk structure 4220 entry needles
5000 needle assemblys, 5100 needle guards
5102 front ends are opened 5104 open rearward end
5110 coupler constructions, 5200 needle bodies
5220 needle bodies
6000 needle bodies, 6100 screw threads
6210 like funnel shaped sunk structure 6220 entry needles
The specific embodiment
Some embodiments of the present invention can be described in detail as follows.Yet except the content of describing in detail, the present invention can also be widely implements at other embodiment, and scope of the present invention do not limited, and its scope with claims is as the criterion.
With reference to figure 2A, be one embodiment of the invention in graphic, represented to utilize safety syringe-drum the structure cutaway view in assembling before of low-pressure suction mode with automatic recovery syringe needle.Fig. 2 B then is the safety syringe structure cutaway view after the assembling.The main element of safety syringe-drum of the present invention comprises: the needle assembly 6 that places outer cylinder body 2 front ends when outer cylinder body 2, the pliability bearing 3, the inner barrel 5 that place outer cylinder body 2 inner belows, the pliability piston 4 that is enclosed within survey outside inner barrel 5 belows, assembling; Place inner barrel 5 belows, it is one cylindric that face shaping becomes approximately, in order to the pliability obturator 8 of sealing inner barrel 5 front openings and be arranged at compressive resistance structure 7 in the pliability obturator 8.More than the function, annexation each other of each main element, and other thin portion element will be introduced explanation in the accompanying drawing in following paragraph.
Because the counteracting force when inner barrel 5 pushes medicaments when injection medicament, even the captivation of the low pressure of confined space formation all may make pliability obturator 8 slip off its position (being convergent part 53 places) originally.To this, the present invention is provided with a compressive resistance structure 7 in the below of pliability obturator 8, slips off its position originally to avoid pliability obturator 8.Compressive resistance structure 7 can be divided into 71 3 parts of linking part of head 72, cervical region 73 and below.Wherein, the unfolded radius in cervical region 73 both sides is greater than the internal diameter of inner barrel 5, when applying an active force from bottom to top, cervical region 73 both sides can be opened and be stuck on the front end 51 of inner barrel 5 (with reference to figure 2B), thereby the pushing counteracting force that medicament produced can resist injection the time.Radius when simultaneously, cervical region 73 opens also is slightly larger than the perforate internal diameter (its effect repeats after holding) of the through hole 31 of pliability bearing 3.72 on head is to be used for the shrinkage pool of pliability obturator 8 chimericly mutually, makes pliability obturator 8 and compressive resistance structure 8 produce related exercise effect.By this design, when cervical region 73 blocked inner barrel 5, the pliability obturator 8 that makes that can be related still was maintained at position originally.Linking part 71 cooperates the space size shape in the needle stand 60 and designs (or opposite needle stand 60 cooperates linking part 71), and two lobes about being divided into can merge when applying active force by both sides to the inside.When stress application with inner barrel by after when pushing away forward (or pushing away from top to bottom), can clamp-on the space of needle stand 60 and combine merging the linking part 71 that gets up, and the resistance to compression function of compressive resistance structure be removed with needle stand 60.And its main purpose is, when reclaiming needle assembly 6, can drive needle assembly 6 with within the stack shell 50 that takes in inner barrel 5, after its detailed functions effect will be described in.
What up to the present, above paragraph had roughly been introduced safety syringe-drum of the present invention respectively forms assembly.Correspond to Fig. 2 B, then more can know the relevant position of understanding assembling, extracting each assembly behind the medicament.In Fig. 2 B, stack shell 20 has extracted and has injected medicament.Then from Fig. 2 C to Fig. 2 F, then drawn the correlative positional relation of safety syringe-drum each assembly when each operational phase (injection → injection finish → reclaim needle assembly) respectively.
With reference to figure 2C, the figure shows and push away inner barrel 5 instantly near injection when finishing, the relevant position of each element in the safety syringe-drum.And according to aforementioned, because the internal diameter of pliability bearing 3 is slightly less than the cervical region 73 of the compressive resistance structure 7 when opening, when inner barrel 5 pushes away forward, the inwall of pliability bearing 3 will be oppressed inwardly closure of cervical region 73, the resistance to compression function of cervical region 73 is removed, and the linking part 71 of drive front end inwardly merges.In other words, the compressive resistance structure 7 that originally separates can inwardly close up.
Next, with reference to figure 2D, this moment user if further inner barrel 5 is exerted pressure forward, then the medicament of syringe will be injected fully and finish, this moment can be with syringe needle by being removed on the injection object, and safety syringe-drum also can begin the mechanism that it reclaims needle assembly automatically.When inner barrel 5 pushes away forward, the linking part 71 of compressive resistance structure 7 will be squeezed into spaces in the needle stand 60 and chimeric mutually with needle assembly 6.And in general, can not residual medicament in the syringe of injection back, pollute in order to avoid overflow syringe.Front end 51 places of inner barrel 5 should support the top of pliability bearing 3 when therefore, injection finished.But, if do not consider syringe needle is pulled away the medicament overflow problem that is subjected to behind the injection object, according to the height difference of compressive resistance structure 7 or pliability bearing 3, this moment inner barrel 5 front end 51 and pliability bearing 3 between leave a little space and be allowed to.
Then Fig. 2 E has then shown when further pushing away inner barrel 5 down, the position of each element in the safety syringe-drum.When Fig. 2 D, linking part 71 sticks among the needle stand 60.Because connecting support 212 withstood needle stand 60, when continuing pushing inner barrel 5 forward the time, compressive resistance structure 7 all can't continue to move forward with pliability obturator 8 again.Therefore, for outer cylinder body 2, when continuing to press down inner barrel 5, pliability obturator 8, compressive resistance structure 7 will rest on the position originally with needle stand 60, and only have the barrel of inner barrel 2 to continue forward, and drive pliability bearing 3 is separated with needle stand 60 forward.On the other hand, with respect to the position of inner barrel 5, pliability obturator 8 is equivalent to pushed away convergent part 53 by the active force that needle stand 60 makes progress with compressive resistance structure 7, and enters comparatively spacious part by a narrower place of internal diameter.
Once mentioned, be the state that is in low pressure in the stack shell 50 of inner barrel 5 before.Therefore, when in Fig. 2 E, pliability obturator 8 breaks away from the convergent part 53 of narrower internal diameter gradually with compressive resistance structure 7 and when entering internal diameter broad place, radial effect power decline because of stack shell 50 walls (being the front end 51 of inner barrel 5) extruding pliability obturator 8, the captivation of low pressure will be in a flash with pliability obturator 8, compressive resistance structure 7 and because of the drive of linking part 71 sucks needle assembly 6 in the stack shell 50 of inner barrels 5 jointly, thereby has finished the process of whole automatic recovery needle assembly.Reclaim safety syringe-drum behind the needle assembly 6 at last shown in Fig. 2 F.
According to above Fig. 2 B to Fig. 2 F, people can know how understand its inner each element of safety syringe-drum of the present invention cooperates running to finish the automatic recovery of needle assembly.Above-mentioned flexible element, as pliability bearing 3, pliability piston 4 and pliability obturator 8, it can use rubber or other pliability material on making; Compressive resistance obturator 7 then can use as materials such as sclerosis resin, plastic materials and implement, and the present invention does not lay down hard and fast rule.In addition, when practical application is made, some little modification, for example, the convergent part 53 of inner barrel 5 might not be defined as from bottom to top " gradually " and broaden, and can also be broadened by narrow once when certain height such as the tomography; The annulus 54 of inner barrel 5 can be more than a circle or two encloses; Pliability obturator 8 does not also limit as for cylindric and middle a shrinkage pool being arranged as the accompanying drawing; Or compressive resistance structure 7 also do not limit can only be divided into about two lobes, 3 lobes or abovely all allow.Similar this type of correction does not by a small margin all break away from invention spirit of the present invention.
And another object of the present invention is to provide the safety syringe-drum and the corresponding interchangeable needle assembly of replaceable needle assembly, and the one preferred embodiment is shown in Fig. 3 A to Fig. 3 E.Be that with the main difference of last embodiment the connecting support part of its needle assembly and outer cylinder body is different.With reference to figure 3A, 3B, under the replaceable needle assembly design of embodiment, needle stand 60 is isolating with needle assembly 3000, only has needle stand 60 to be placed among the pliability bearing 3 during assembling.In addition, needle stand 60 more is provided with an inverted U piston part 33, and it can be used in conjunction with needle assembly (holding the back explanation).After this other element such as inner barrel, pliability bearing, the sliding plug of pliability ... wait and do not do change if do not have very connection with the innovation part, will repeat no more in the description.
Fig. 3 A represents that one has the needle assembly 3000 of coupler construction, comprises the lateral coupler construction 3100 that places relative 180 degree in needle assembly 3000 both sides; The top, top has like funnel shaped sunk structure 3120; And the Lower Half that is positioned at needle assembly 3000, be Handheld Division 3140 near the part of injection needle 3160.Wherein, funnelform sunk structure 3120 communicates with the perforation of entry needle 3160, can flow through sunk structure 3120 and extrude outside the safety syringe-drum by entry needle 3160 of medicament.
Fig. 3 B represents to have the structural representation of the safety syringe-drum of track.Among the figure, track 3200 is positioned on the internal face of outer cylinder body 2 (part that is equivalent to Fig. 2 A connecting support 212), and its thin portion structure can be with reference to figure 3C.By track 3200, user can be held in the Handheld Division 3140 coupler construction 3100 inserted track 3200, and the direction along track 3200 upwards pushes in the syringe then.With reference to figure 3D-E, needle assembly 3000 moves up along track 3200, be the center afterwards again with the longitudinal axis, following motion track 3210 rotates in the groove 3220 that coupler construction 3100 can be snapped on the outer cylinder body inwall, and the upper end of inverted U piston part on the packing needle stand 60 33 and needle assembly 3000, to finish the program of locking pin assembly 3000.And screw out according to opposite direction, needle assembly 3000 and groove 3220 can be separated.
In this embodiment, the linking part 71 of compressive resistance structure 7 will snap in the built-in hollow space of needle stand 60.And by the upper end of the inverted U-shaped piston part 33 of packing with needle assembly 3000, when reclaiming needle assembly, the low pressure of stack shell 50 will provide captivation pulling pliability obturator 8, compressive resistance structure 7, and spur needle stand 60 and needle assembly 3000 jointly, so needle stand 60 will be inhaled among the stack shell 50 in the lump with needle assembly 3000.
Mandatory declaration be that coupler construction 3100 is not to be defined as a pair ofly, can also use the coupler construction 3100 more than 3 or 3 to implement.Moreover coupler construction 3100 also can take non-homogeneous mode to be distributed on the circumference, and for example, when using 3 coupler constructions, wherein two angles are 160 degree, and with the angle of another coupler construction be 100 degree.For the quantity and the position distribution angle of coupler construction 3100, the present invention does not limit, and several following embodiment also are like this.
Fig. 4 A to Fig. 4 E has shown the structural representation of another embodiment of the safety syringe-drum of replaceable syringe needle provided by the present invention.Wherein, Fig. 4 A shows the structure chart of another removable needle assembly, the needle body 4200 that it has needle guard 4000 and is positioned at needle guard 4100.Relative 180 degree places, needle guard 4100 outsides have a pair of coupler construction 4110, and 4200 of needle bodies are to be arranged in the needle guard 4100, and both can separate.Needle body 4200 tops are provided with a funnel shaped sunk structure 4210, and the needle body below then is an entry needle 4220.Entry needle 4220 passes needle guard 4100 and exposes to needle guard 4100.
Fig. 4 B has shown the schematic cross-section of the safety syringe-drum of replaceable needle assembly.Different with last embodiment is, the part (4C part among the figure) that is used for fixing coupler construction on the outer cylinder body 2 directly is arranged at front end 21 edges of outer cylinder body 2, and its structure is as the first half of Fig. 3 C, and Fig. 4 C then is its longitudinal sectional view.With reference to figure 4D-E, user can be held Handheld Division 4020 needle guard 4100 (being with needle body 4200) is upwards inserted safety syringe-drum, and coupler construction 4110 will be rotated counterclockwise and stick among the groove 2110 and the fixing position of needle guard 4100 along slide rail 2100, and the inverted U-shaped piston part 33 of needle stand 60 also can with the first half 4010 packings of needle body 4210, and the top is attached to the below of needle stand 60.Rotate the taking-up of needle assembly 4000 can being outwarded winding in opposite direction.When replacing needle assembly, can only replace needle body 4200, and needle guard 4100 is reusable to save cost.When reclaiming needle assembly, be to block needle stand 60 equally, and drive needle body 4200 disengagings, and needle guard 4100 can't move with in the suction stack shell 50 by linking part 71.
Fig. 5 A to Fig. 5 C has shown an embodiment again of interchangeable needle assembly and safety syringe-drum.As Fig. 5 A, needle body 5200 is inserted by the open rearward end 5104 of needle guard 5100, and entry needle 5220 passes the front opening 5102 of needle body 5100 and exposes.With different being of a last embodiment, needle guard 5100 is shorter more than 5110 in coupler construction, and the first half major part of needle body 5200 is exposed to outside the needle guard 5100.So can reduce the materials of needle guard 5100 and reduce cost.In this example, needle guard 5100 can't support needle stand 60 belows, and its stability may be slightly poor.People can do coupler construction 5110 bigger, or increase its quantity to improve its fixed stability.The fixing partial design of coupler construction 5110 identical with last embodiment (with reference to figure 4C), and that the interlock mode when reclaiming syringe needle does not also have is different, so locate do not giving unnecessary details.
Fig. 6 A to Fig. 6 C is the another embodiment of safety syringe-drum of the present invention, needle assembly.The needle assembly of Fig. 6 A, its needle body 6000 upper ends have a screw thread 6100 and a funnelform sunk structure 6210, and needle body 6000 lower ends then are that an entry needle 6220 is arranged.And in present embodiment, utilize similar screw to be lock onto the mode of screw, needle stand 60 is combined with needle body 6000, so as afterwards and then pliability obturator 8 be inhaled into together among the inner core Shen 50.With reference to figure 6B, needle stand 60 inwalls in the pliability bearing 3 are carved with screw thread 630, can be screwed with the screw thread 6100 of needle body 6000 upper ends, with fixedly needle stand 60 and needle body 6000.Do not use needle guard in this example.As Fig. 6 C, user rotation needle body 6000, can be bonded portion 71 jointly and bring in the stack shell 50 when reclaiming syringe needle in the future with among the needle body 6000 lock inserting needle seats 60.
More than enumerate the design of four kinds of interchangeable needle assemblys and corresponding safety syringe-drum, the mechanism that how to cooperate low-pressure suction mode of the present invention has been described, obtained the safety syringe-drum of replaceable needle assembly.And its essence spirit is, allows the needle stand in needle body and the safety syringe-drum of needle assembly combine, and the traction by compressive resistance structure 7 linking parts 71, is gone among the inner barrel stack shell 50 by the low-pressure suction of inner barrel 5 jointly.
Compare with conventional syringes, among the infection risk that safety syringe-drum of the present invention can be avoided allowing the healthcare givers be exposed to manual recovery syringe needle.Comparing with previously mentioned United States Patent (USP), use the low-pressure suction mode not need to expend other object (as spring) and produce pulling force, is to be an embodiment than environmental protection.Simultaneously, cooperate needle assembly structure miscellaneous, can allow safety syringe-drum of the present invention can freely change its syringe needle, the impaired unnecessary waste that promptly needs whole replacing safety syringe-drum to be caused is arranged thereby can reduce each syringe needle one.Therefore, safety syringe-drum of the present invention is not only comparatively saved cost, also relatively environmental protection.
The above is preferred embodiment of the present invention only, is not in order to limit claim of the present invention; All other do not break away from the equivalence of being finished under the disclosed spirit and changes or modification, all should be included in the following claim scope.
Claims (10)
1. a safety syringe-drum is characterized in that, comprising:
One outer cylinder body has a front opening and an open rearward end, and a connecting support is positioned at this front opening place;
One pliability bearing is equipped in this front opening place of this outer cylinder body inwall;
One needle assembly combines with this pliability bearing and is arranged at this front opening place of this outer cylinder body, and this pliability bearing is arranged on this connecting support after in conjunction with this needle assembly, and this needle assembly comprises a needle stand and this needle assembly and this needle stand and is separated from each other;
One inner barrel has a front end, a rear end and the hollow stack shell between this front end and this rear end, and this inner barrel is inserted in this outer cylinder body by this open rearward end of this outer cylinder body;
One pliability piston places on this front end lateral wall of this inner barrel;
One pliability obturator is arranged at this front inner wall of this inner barrel, with this hollow stack shell of sealing this inner barrel to form a low pressure confined space; And
One compressive resistance structure, with this pliability obturator tabling, the counteracting force when pushing the liquid that is placed in this outer cylinder body inside forward to resist this inner barrel;
When this front opening of this this outer cylinder body of inner barrel convergence, this compressive resistance structure combines with this needle assembly, this front end of this inner barrel pushes against this pliability bearing to liberate combining of this needle assembly and this pliability bearing, and this pliability obturator is subjected to a counteracting force of this needle assembly to make this pliability obturator push away this front inner wall of this inner barrel, and this pliability obturator and this needle assembly this low pressure confined space of being subjected to this inner barrel attracts and in this inner barrel of interior withdrawal afterwards.
2. safety syringe-drum as claimed in claim 1, wherein, this pliability bearing inside has a through hole to combine with this needle stand.
3. safety syringe-drum as claimed in claim 1, wherein, this compressive resistance structure comprises:
One head, this head captured make this compressive resistance structure and this pliability obturator tabling in a shrinkage pool of this pliability obturator;
One cervical region, the radius when this cervical region opens is greater than the internal diameter of this front inner wall of this inner barrel and be butted on this front end of this inner barrel the counteracting force when pushing the liquid that is placed in this outer cylinder body inside forward to resist this inner barrel; And
One linking part, this linking part advance in this needle stand in the space and combine with this needle assembly.
4. safety syringe-drum as claimed in claim 1, wherein, this front end of this inner barrel forms a convergent part, and this pliability obturator is arranged at this convergent part place.
5. a safety syringe-drum is characterized in that, comprising:
One outer cylinder body, this outer cylinder body has a hollow stack shell, this hollow stack shell has a front end and a rear end, this front end has a front opening, this rear end has an open rearward end, one sectional area of this front opening is less than a sectional area of this open rearward end, has the end that a track and a sunk structure are arranged at this track in the inboard of this front end of this outer cylinder body;
One pliability bearing, this pliability bearing is equipped in this outer cylinder body, has a through hole of front and back trend;
One needle assembly, have a needle body and have a needle guard of a small perforation, make when this needle body is sheathed on this needle guard, one entry needle of this needle body penetrated this small perforation and exposed to this needle guard, the top that the outside of this needle guard has two coupler constructions and this needle body has a just like funnel shaped depressed part, this needle assembly is mounted in this front opening of this outer cylinder body, make this needle assembly push in this stack shell of cylindrical shell outward via this track of this outer cylinder body, make these two coupler constructions move to this stack shell direction rotation of this outer cylinder body, and this coupler construction combine and is equipped in this sunk structure with sunk structure along a track of this track;
One needle stand has a piston part packing and pushes this needle assembly, and this pin base fastener is formed in this through hole of this pliability bearing;
One compressive resistance structure has the front end of a bond sites in this compressive resistance structure;
One inner barrel, have a front end, a rear end and at this front end of this inner barrel and the hollow stack shell between this rear end, this front end of this inner barrel has a sectional area than the perforation greater than this needle assembly external diameter, and the front end of this inner barrel internal face has a convergent part, this inner barrel is located in this outer cylinder body, moves between this this pliability bearing position of inner barrel front end convergence and this inner barrel front end are away from a position of this bearing;
One pliability piston is arranged on the lateral wall of this front end of this inner barrel; And
One pliability obturator, combine with the compressive resistance structure and make this linking part of its compressive resistance structure expose to this pliability obturator, and this pliability obturator butt is urgent in this convergent part of this inner barrel, and close this perforation of this front end of this inner barrel, make and seal a low pressure that is lower than this safety syringe-drum outside in this stack shell of this inner barrel up for safekeeping, when this pliability bearing to a predeterminable range of this inner barrel front end convergence, this linking part that is positioned at intravital this compressive resistance structure of pliability sealing moves towards this front end of this outer cylinder body, combine with this needle assembly via this needle stand that is positioned at this pliability bearing, these inner barrel pushing and pressing are to this pliability bearing, to liberate the combination of this needle stand and this pliability bearing, and this pliability obturator is subjected to a counteracting force of this needle stand, to liberate the bonding state of this pliability obturator and this convergent part, this pliability obturator and this needle assembly are subjected to this interior low-pressure suction of this stack shell of this inner barrel, and in this stack shell of interior this inner barrel of withdrawal.
6. safety syringe-drum as claimed in claim 5, wherein, this track is arranged at the inboard of this front end of relative 180 these outer cylinder bodies of spending.
7. safety syringe-drum as claimed in claim 5, wherein, this coupler construction is arranged on the side of these relative 180 degree in needle guard outside.
8. safety syringe-drum as claimed in claim 5, wherein, this needle body has long first half and protrudes in this needle guard, this coupler construction is arranged at a top of this needle guard, make this needle assembly push in this stack shell of cylindrical shell outward, and make should the combining of this top of this needle assembly like this interior piston part of funnel shaped this depressed part and this needle stand via this track.
9. safety syringe-drum as claimed in claim 5, wherein, this coupler construction combines on the inboard of this front end that is arranged at this outer cylinder body with this sunk structure.
10. safety syringe-drum as claimed in claim 5, wherein, this needle body has short first half and protrudes in this needle guard, make this needle assembly push in this stack shell of cylindrical shell outward, and make should the combining with this piston part of this needle stand of this top of this needle assembly like funnel shaped this depressed part via this track.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510108567A CN100581606C (en) | 2005-10-10 | 2005-10-10 | Safety cylinder of injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510108567A CN100581606C (en) | 2005-10-10 | 2005-10-10 | Safety cylinder of injector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1947806A CN1947806A (en) | 2007-04-18 |
| CN100581606C true CN100581606C (en) | 2010-01-20 |
Family
ID=38017495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200510108567A Expired - Fee Related CN100581606C (en) | 2005-10-10 | 2005-10-10 | Safety cylinder of injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100581606C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101856529B (en) * | 2009-04-07 | 2012-07-11 | 曾锡勋 | Safe needle cylinder |
-
2005
- 2005-10-10 CN CN200510108567A patent/CN100581606C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1947806A (en) | 2007-04-18 |
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