CN207755340U - A kind of part replacement is convenient and can avoid the set of cross-infection bundle syringe - Google Patents

Abstract

The part replacement of the utility model is convenient and can avoid the set of cross-infection and pricks syringe, including shell, sucker, air intake duct, pushes away circle, ejector sleeve and trigger, and cylinder, gear set, upper rack and lower rack are provided in shell；It is characterized in that：Lower being fixedly arranged at the front end with for rack is cut somebody's hair, and pushing block is fixedly arranged at the front end with guide rod, and the periphery of guide rod is cased with return spring；The upper end of pushing block offers L-shaped seat mouth, and the both sides of ejector sleeve rear end are fixed with block, and the front end of connecting cylinder offers L-shaped groove, and the rear end of air intake duct is fixed with the limited post for being caught in L-shaped groove.The set of the utility model pricks syringe, and cocking can drive upper rack to move backward, lower rack travels forward, and realizes and takes out negative pressure and set bundle.During being treated to patient sucker, push away circle, air intake duct and ejector sleeve while contaminated, pass through replacement and can avoid cross-infection.Due to being limited to block using L-shaped seat mouth, the phenomenon that ejector sleeve slips is avoided, ensure that and push away being smoothed out for circle every time.

Description

A kind of part replacement is convenient and can avoid the set of cross-infection bundle syringe

Technical field

The utility model is related to a kind of sets to prick syringe, more specifically, more particularly to a kind of part replacement it is convenient and can The set of cross-infection is avoided to prick syringe.

Background technology

To patient's polyp（Such as hemorrhoid）In the therapeutic process at position, the treatment side of generally use " absorption-injection-set is pricked " Method, to achieve the purpose that thoroughly eradicating to disease.As Patent No. CN2011101708199, utility model are entitled medical The utility model patent file of note set therapeutic equipment, pushes away piston rod 20 and rack by trigger 13 as shown in figure 9, disclosing one kind Bar 15 is carried out at the same time driving, realizes the suction negative pressure of sucker 2 using movement of the piston rod 20 in cylinder 8, and then to patient's disease It is adsorbed at stove position；It pushes pushing sleeve 18 to travel forward forward using rack push rod 15, and then the cushion rubber on sucker 2 is backed off, Realize set bundle effect.

But medical ligation injection therapeutic equipment disclosed in above-mentioned file, since plastic casing-pipe 4 gos deep into pushing away in gun shaped casing and with rack Bar 15 is connected through a screw thread, and is fixed by nut, and it is non-exchange that this, which allows for plastic casing-pipe 4,；Due to air intake duct 3 Inner end is inserted on cylinder 8, this is but also air intake duct is also non-removable, during use, if only replace sucker 2 or Corresponding component is cleaned, cross-infection when cannot solve the problems, such as to treat different patients.Simultaneously as trigger 13, piston rod 20, on rack push rod 15 tooth size（The modulus of tooth）It is smaller（Less than 1）, this is not only to the processing of each component essence Spend it is more demanding, and assemble up it is also very time-consuming and laborious, and to the dynamics of operating trigger 13 require it is also larger, using not It is very convenient.

The patent document of Patent No. 201610036268.X, utility model entitled " reusable type looping and binding device ", A kind of reusable looping and binding device is disclosed, uses pumping negative pressure pump 2 to carry out taking out negative pressure automatically, and be provided with to taking out negative pressure pump 2 accumulators 3 being powered.The looping and binding device of this form, since the cost for taking out negative pressure pump 2 is higher so that be formed by set and prick Device it is expensive, increase patient burden；And the weight for taking out negative pressure pump 2 and accumulator 3 is larger so that looping and binding device uses It is more inconvenient to come.

Moreover, the suction pipe 5 and push rod 16 disclosed in above-mentioned patent document assemble not only inconvenience, but also it is also easy to make The phenomenon that misplacing at push rod 16 and cannot normally pushing away circle.Since the rear end of L-shaped groove 11 is located at the inside of circular slab 26, user from It can't see L-shaped groove 11 in outside so that during suction pipe 5 is inserted into L-shaped groove 11, user can not be confirmed whether to be inserted in place, and make It is more inconvenient to assemble.As shown in Figure 10, since the block 21 on push rod 16 does not limit on block 19, for installation For unskilled medical staff, block 21 easily occurs and is in position shown in dotted lines in Figure 10, causes block 21 that can not push away Dynamic push rod 16 migrates, and causes to push away circle failure.

Invention content

The shortcomings that the utility model is in order to overcome above-mentioned technical problem provides a kind of part replacement convenience and avoidable friendship The set of fork infection pricks syringe.

The part replacement of the utility model is convenient and can avoid the set of cross-infection bundle syringe, including shell, sucker, suction Tracheae pushes away circle, ejector sleeve and trigger, and the front end of air intake duct is communicated with the internal cavities of sucker, and the front end of ejector sleeve is mutually fixed with ejector sleeve； It is provided with cylinder, gear set, upper rack and lower rack in shell, the open rearward end of cylinder and front end is provided with the company communicated therewith Connect cylinder is provided with and the mutually fixed piston of upper rack in cylinder；Gear set is by the positioned at intermediate gear wheel and positioned at both sides One pinion gear and the second pinion gear composition, the upper end of trigger are fixed with sector engage with the second pinion gear, upper rack with greatly The upper edge of gear is meshed, and lower rack is meshed with the lower edge of the first pinion gear；It is characterized in that：The front end of the lower rack is solid Surely cut somebody's hair, the front end cut somebody's hair is provided with the pushing block for being in contact with it cooperation, and pushing block is fixedly arranged at the front end with guide rod, guide rod it is outer It encloses and is cased with return spring, the limited block limited to return spring is fixed on the inner wall of shell, offered on limited block pair The through-hole that guide rod is oriented to；The upper end of the pushing block offers L-shaped seat mouth, and the both sides of ejector sleeve rear end are fixed with for being stuck in The front end of block on L-shaped seat mouth, connecting cylinder offers L-shaped groove, and the rear end of air intake duct is fixed with for being caught in L-shaped groove Limited post, the removable of ejector sleeve and air intake duct is realized by the cooperation of the cooperation of block and L-shaped seat mouth, limited post and L-shaped groove, To be replaced while realizing sucker, push away circle, air intake duct and ejector sleeve.

The part replacement of the utility model is convenient and can avoid the set of cross-infection bundle syringe, including by battery, power supply Switch and multiple lighting lamp groups at lighting device, battery is set in shell, and power switch is fixed on the rear end of shell, shell Be fixedly arranged at the front end with front apron, the front end of headlamp passes through front apron, and the conducting wire on power output end is through power switch to illumination Lamp is powered.

The part replacement of the utility model is convenient and can avoid the set of cross-infection bundle syringe, and the front apron, which is located at, to be connected The periphery of connect cylinder, L-shaped groove are opened on the connecting cylinder on the outside of front apron, so that the connection state of limited post and L-shaped groove can See.

The part replacement of the utility model is convenient and can avoid the set of cross-infection bundle syringe, canine tooth on the gear set The modulus of wheel, the first pinion gear and the second pinion gear is 1~1.5.

The part replacement of the utility model is convenient and can avoid the set of cross-infection bundle syringe, and the piston is by front limit Plate, rear position margining plate and between front limit plate and rear position margining plate the first cushion rubber composition, the cylinder interior cavity it is straight Diameter is gradually reduced by front end to rear end.

The part replacement of the utility model is convenient and can avoid the set of cross-infection bundle syringe, and the rear end of the ejector sleeve is solid Surely there is ejector sleeve housing, block, which is fixed on outside ejector sleeve, to be put on；The rear end of air intake duct is fixed with air intake duct housing, and limited post is fixed on suction On air pipe sleeve, the second cushion rubber being interference fitted with the inner cavity of connecting cylinder is provided in the middle part of air intake duct outer barrel.

The part replacement of the utility model is convenient and can avoid the set of cross-infection bundle syringe, is offered on the sucker The jack being connected with air intake duct, the front end of jack are the through-hole communicated with the internal cavities of sucker, the jack by outside extremely Decreasing pore size between through-hole, to realize the secured connection of air intake duct and sucker.

The part replacement of the utility model is convenient and can avoid the set of cross-infection bundle syringe, and the gear set is integrated Formula gear.

The part replacement of the utility model is convenient and can avoid the set of cross-infection bundle syringe, is fixed on the shell Upper cover plate, for ease of the guiding notch of pushing block movement between upper cover plate and shell；It offers on pushing block and to be passed through convenient for upper cover plate Groove is fixed with guiding rib on the groove of pushing block, is provided on the lower surface of upper cover plate and the matched guide groove of guiding rib.

The utility model has the beneficial effects that：The set of the utility model pricks syringe, by by sector, upper rack, under Rack is meshed with the second pinion gear, gear wheel, the first pinion gear on gear set respectively so that during cocking Upper rack moves backward, lower rack travels forward, and realizes and takes out negative pressure using the rear shift-in row of piston in the cylinder, can be by patient Affected area be adsorbed in sucker, realize and drive ejector sleeve to carry out pushing away cushion rubber, it can be achieved that affected area using the Forward of lower rack Set prick.Pass through the limited post and L-shaped groove on the detachable cooperation of L-shaped seat mouth on the block and pushing block on ejector sleeve, air intake duct Detachable cooperation so that detachable, the replacement for being convenient for sucker, pushing away circle, air intake duct and ejector sleeve of ejector sleeve and air intake duct, i.e., Make sucker during being treated to patient, push away circle, air intake duct and ejector sleeve while being contaminated, passes through and replace avoidable intersect Infection.Due to being limited to block using L-shaped seat mouth, avoid in the past since block rotates what generation ejector sleeve not in place slipped Phenomenon ensure that and push away being smoothed out for circle every time.

Further, gear set uses integral type gear, avoids secondary operation and assembling, reduces cost, improves Production efficiency.By be provided on upper cover plate with the matched guide groove of guiding rib on pushing block, be oriented to by guiding rib Linear motion in slot effectively reduces the frictional force in pushing block motion process, ensures the long-term normal slim and graceful movement of pushing block.It is logical It crosses and is exposed to the junction of the junction of block and L-shaped seat mouth, limited post and L-shaped seat mouth outside, realize under the conditions of visual The dismounting and connection for carrying out air intake duct and ejector sleeve, it is more preferably convenient to use.By by gear wheel, the first small tooth on gear set Between wheel and the modular design of the second pinion gear are 1 to 1.5, the size of tooth is increased, intensity is increased, also thus increases it Fit clearance reduces frictional resistance so that trigger is pulled more laborsaving, is more conducive to be adsorbed and covered bundle.Passing through will The internal diameter of cylinder is designed as the form being gradually reduced from front to back, ensure that the leakproofness during moving after piston, ensure that suction Effective pressure in disk and patient's affected area absorption is smoothed out.By by the socket design on sucker be by outside to inside by The thin shape of gradual change ensure that being bonded for air intake duct and sucker so that sucker is not detached from air intake duct when pushing away circle.

Description of the drawings

Fig. 1 is that the set of the utility model pricks the front view of syringe；

Fig. 2 is that the set of the utility model pricks the right view of syringe；

Fig. 3 is that the set of the utility model pricks the sectional view of syringe；

Fig. 4 is that the set of the utility model pricks the stereogram of syringe；

Fig. 5, Fig. 6 and Fig. 7 are that the set of the utility model pricks the partial enlarged view of syringe；

Fig. 8 is the connection diagram of limited post and connecting cylinder；

Figure 12 and Figure 13 is pushing block and the matched structural schematic diagram of upper cover plate in the utility model.

In Fig. 1 to Fig. 8 and in Figure 12 and Figure 13：1 shell, 2 triggers, 3 cylinders, 4 pistons, 5 air intake ducts, 6 ejector sleeves, 7 inhale Disk, 8 push away circle, and 9 gear sets, 10 upper racks, 11 times racks, 12 cut somebody's hair, 13 pushing blocks, 14 guide rods, 15 return springs, 16 limits Block, 17 blocks, 18 connecting cylinders, 19 limited posts, 20 batteries, 21 power switches, 22 headlamps, 23 front aprons, 24 wiring boards, 25 fans Shape tooth, 26 gear wheels, 27 first pinion gears, 28 first cushion rubbers, 29 front limit plates, 30 rear position margining plates, 31 ejector sleeve housings, 32 L-shaped Seat mouth, 33 L-shaped grooves, 34 arc grooves, 35 syringe pedestals, 36 air intake duct housings, 37 second cushion rubbers, 38 through-holes, 39 insert Hole, 40 scalp acupunctures, 41 limiting plates, 42 rubber stoppers, 43 upper cover plates, 44 guiding ribs, 45 guide grooves, 46 are oriented to notch, 47 cushion rubbers.

Fig. 9 is the structural schematic diagram of the medical ligation injection therapeutic equipment disclosed in Patent No. CN2011101708199 files；

In Fig. 9：In figure：1 set of bundle cushion rubber, 2 suckers, 3 air intake ducts, 4 plastic casing-pipes, 5 ejector sleeves, 6 drive end bearing brackets, 7 pistons, 8 gas Cylinder, 9 guide rails, 10 gear sets, 11 shells, 12 power supplys, 13 triggers, 14 resetting springs, 15 rack push rods, 16 light emitting diodes, 17 Needle holder, 18 pushing sleeves, 19 power switches, 20 piston rods, 21 contact springs, 22 plunger shafts, 23 suspension ribs, 24 sealing rings, 27 refer to Show lamp.

Figure 10, Figure 11 are the knot of the reusable type looping and binding device disclosed in Patent No. CN201610036268.X files Structure schematic diagram.

In Figure 10 and Figure 11：1 shell, 2 take out negative pressure pump, and 3 accumulators, 5 suction pipes, 6 storage tanks, 7 connectors, 8 triggers, 16 push away Bar, 17 pushing blocks, 18 guide grooves, 19 convex blocks, 20 grooves, 21 blocks, 22 compressed springs, 26 circular slabs, 27 headlamps, 28 inhale negative pressure Pipe, 29 flush pipes, 39 gib blocks.

Specific implementation mode

The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.

As shown in Figures 1 to 4, the set that the utility model is set forth pricks front view, right view, the sectional view of syringe And stereogram, Fig. 5, Fig. 6 and Fig. 7 give the utility model set prick syringe partial enlarged view, shown in set prick note Emitter by shell 1, trigger 2, cylinder 3, piston 4, air intake duct 5, ejector sleeve 6, sucker 7, push away circle 8, gear set 9, upper rack 10, lower tooth Item 11,12, pushing block 13 of cutting somebody's hair, guide rod 14, return spring 15, limited block 16, block 17, connecting cylinder 18, limited post 19, battery 20, power switch 21, headlamp 22, front apron 23, wiring board 24, sector 25, the first cushion rubber 28, ejector sleeve housing 31, injection Device pedestal 35, air intake duct housing 36 and the second cushion rubber 37 composition, shown shell 1 are the latter half shape of gun body, and trigger 2 is arranged In on shell 1, the setting of cylinder 3 is with shell 1, and the inside of cylinder 3 is cavity and open rearward end, and connecting cylinder 18 is fixed on cylinder 3 Drive end bearing bracket, and communicated with the internal cavities of cylinder 3.Piston 4 is located in cylinder 3, and piston 4 is by front limit plate 29 and rear position margining plate 30 and the first cushion rubber 28 composition for being disposed between, the internal cavities of piston 4 and cylinder 3 are interference fit.

The reduced diameter of the inner cavity of shown cylinder 3 from front to back, to be remained during shifting after piston 4 With 3 inner wall better seal of cylinder, ensure to inhale being smoothed out for negative pressure.Piston 4 is fixed with 10 phase of upper rack, upper rack 10 Top is provided with the limiting plate 41 limited to it, to ensure that upper rack 10 moves in the horizontal direction always.Shown gear set 9 By gear wheel 26 and it is fixed on the first pinion gear 27 of 26 both sides of gear wheel and the second pinion gear forms, sector 25, which is fixed on, to be pulled It on machine 2, and is meshed in the second pinion gear, gear set 9 uses integral type gear, i.e. gear wheel 26, the first pinion gear 27 and the Two small teeth use integrated injection molding, avoid secondary operation and assembling, reduce cost, improve production efficiency.Upper rack 10 are meshed with the upper edge of gear wheel 26, and lower rack 11 is meshed with the lower edge of the first pinion gear 27, in this way, in cocking 2 During driving gear set 9 to rotate, upper rack 10 can be driven to move backward, drive lower rack 11 to travel forward, realize respectively It inhales negative pressure and pushes away circle.

It cuts somebody's hair 12 front ends for being fixed on lower rack 11, cuts somebody's hair and be provided with the cross rib limited to pushing block 13 on 12, to ensure Cut somebody's hair 12 with the close contact always of pushing block 13.Guide rod 14 is fixed on the front end of pushing block 13, and return spring 15 is sleeved on guide rod On 14, limited block 16 limits the front end of return spring 15, and offers on limited block 16 and be oriented to guide rod 14 Through-hole, guide rod 16 wears in through-holes.Instantly the Forward of rack 11 is completed after pushing away circle, under the action of return spring 15, can be driven Make 2 return of lower rack 11, upper rack 10 and trigger.

The centre of pushing block 13 offers the groove passed through convenient for ejector sleeve 6, and the both sides of 13 upper end of pushing block offer L-shaped seat mouth 32, the rear end of pushing block 6 is fixed with pushing block housing 31, and the both sides of ejector sleeve housing 31 are fixed with block 17, and block 17 is for being stuck in L-shaped On seat mouth 32, since the step on L-shaped seat mouth 32 is to the position-limiting action of block 17, block 17 can be remained during pushing away circle In horizontality, avoids block 17 from rotating and cause to push away circle failure.As shown in Figure 12 and Figure 13, it is fixed on shell 1 Upper cover plate 43, the guiding notch 46 moved for ease of pushing block 13 between upper cover plate 43 and shell 1 are fixed on the groove of pushing block 13 Guiding rib 44, be provided on the lower surface of upper cover plate 43 with the matched guide groove 45 of guiding rib, be oriented to by guiding rib 44 Linear motion in slot 45 effectively reduces the frictional force in 13 motion process of pushing block, ensures the long-term normal slim and graceful of pushing block 13 Movement.As shown in figure 11, the schematic diagram for giving Patent No. CN201610036268.X files, due to convex block 19 and block 21 The position of contact is that vertical plane easily causes to keep off in the case where the block 21 on push rod does not turn to horizontality Block 21（As shown in the dotted line in Figure 11）It is slipped from the intermediate groove of pushing block, causes push rod 16 that can not move forward, cause cushion rubber Failure.The utility model can avoid the generation of 17 slip phenomenon of block using L-shaped seat mouth 32 and 17 matched form of block.

The front end of shown connecting cylinder 18 offers L-shaped groove 33, and the rear end of air intake duct 5 is fixed with air intake duct housing 36, limit Position column 19 is fixed on air intake duct housing 36, and limited post 19 is matched with L-shaped groove 33, and limited post 19 is recessed for being inserted into L-shaped In slot 33.As shown in figure 8, giving the connection diagram of limited post and connecting cylinder, it is arranged on the leading flank of shown L-shaped groove 33 There is arc groove 34, when limited post 19 is inserted into L-shaped groove 33 and screws in 34 position of arc groove, since arc groove 34 is right The limit of limited post 19 can avoid limited post 19 and is detached from from L-shaped groove 33.The centre position of shown air intake duct housing 36 Place is additionally provided with the second cushion rubber 37, to ensure the leakproofness after air intake duct 5 is inserted into connecting cylinder 18.

Front apron 23 is located at the periphery of connecting cylinder 18, and makes L-shaped groove 33 exposed outside, such block 17 and L-shaped seat The junction of mouthfuls 32 junction, limited post 19 and L-shaped groove 33 is all exposed to outer so that user carries out under the conditions of visual The connection of block 17 and L-shaped seat mouth 32, limited post 19 and L-shaped groove 33, replacing will be more convenient.It is finished to patient's treatment Afterwards, due to using sucker 7, push away circle 8, air intake duct 5 and ejector sleeve 6 and meanwhile replace by the way of, even if the front end of air intake duct 5 and ejector sleeve 6 It is contaminated, successive patients will not be impacted, so as to avoid cross-infection.

Shown sucker 7 is fixed on the front end of air intake duct 5, pushes away circle 8 and is fixed on the front end of ejector sleeve 6, and pushes away circle 8 and be located at sucker 7 Periphery, so that the cushion rubber being sleeved on sucker 7 is pushed.As shown in fig. 7, being offered on sucker 7 matched slotting with air intake duct 5 The front end in hole 39, jack 39 offers through-hole 38, and through-hole 38 is for jack 39 to be connected to the inner cavity of sucker 7.Jack 39 is by outer Side is to the decreasing pore size between through-hole 38, to ensure the secured connection of air intake duct 5 and sucker 7.It is provided with rubber on sucker 7 Scalp acupuncture 41 when drug administration by injection of being expert at is treated, can be passed through rubber stopper 42, then scalp acupuncture 41 is connected with syringe by plug 42, Injection treatment can be realized.

Offered on shown front apron 23 convenient for headlamp 22 by multiple through-holes, headlamp 22 is fixed on wiring board 24 On, wiring board 24 is used to carry out centrally connected power supply to headlamp 22.Battery 20 is arranged within the case 1, and power switch 21 is set to shell The output of the rear end of body 1, battery 20 is powered headlamp 22 through power switch 21.

During use：Block 17 on ejector sleeve 6, the limited post 19 on air intake duct 5 are stuck in L-shaped by user first On seat mouth 32 and in L-shaped groove 33, then cushion rubber is sleeved on sucker 7（Also it can be pushed away in connection first by cushion rubber on sucker 7 Pipe 6 and air intake duct 5）.If you need to illuminate, then headlamp 22 is opened by power switch 21.Then sucker 7 is aligned to the lesion of patient Place, cocking 2, gear set 9 are moved into row pumping negative pressure after driving upper rack 10, and the lesions position of patient is inhaled into sucker 7；So In the lesion that some drugs push-in in syringe is inhaled into sucker 7 afterwards.Continue cocking 2 backward, with lower rack 11 continue to move forward, and can drive pushing away circle 8 and push the cushion rubber on sucker 7, realize and pricked to the set of lesions position, and by remaining medicine Object is pushed into.After treatment, air intake duct 5 and ejector sleeve 6 are unloaded from shell 1, when such as needing to treat another patient, should be replaced New air intake duct 5 and ejector sleeve 6 is treated, to avoid cross-infection phenomenon occurs.

Claims (9)

1. a kind of part replacement is convenient and can avoid the set of cross-infection bundle syringe, including shell（1）, sucker（7）, air intake duct （5）, push away circle（8）, ejector sleeve（6）And trigger（2）, the front end of air intake duct communicates with the internal cavities of sucker, the front end of ejector sleeve with push away Pipe is mutually fixed；Cylinder is provided in shell（3）, gear set（9）, upper rack（10）With lower rack（11）, the open rearward end of cylinder And front end is provided with the connecting cylinder communicated therewith（18）, it is provided with and the mutually fixed piston of upper rack in cylinder；Gear set is by position In intermediate gear wheel（26）With the first pinion gear positioned at both sides（27）It is formed with the second pinion gear, the upper end of trigger is fixed with The sector engaged with the second pinion gear（25）, upper rack is meshed with the upper edge of gear wheel, lower rack and the first pinion gear Lower edge is meshed；It is characterized in that：Being fixedly arranged at the front end with for lower rack is cut somebody's hair（12）, the front end cut somebody's hair, which is provided with, to be in contact with it The pushing block of cooperation（13）, pushing block is fixedly arranged at the front end with guide rod（14）, the periphery of guide rod is cased with return spring（15）, shell The limited block limited to return spring is fixed on inner wall（16）, offer on limited block guide rod is oriented to it is logical Hole；The pushing block（13）Upper end offer L-shaped seat mouth（32）, the both sides of ejector sleeve rear end are fixed with for being stuck in L-shaped seat mouth Block（17）, connecting cylinder（18）Front end offer L-shaped groove（33）, the rear end of air intake duct is fixed with recessed for being caught in L-shaped Limited post in slot（19）, ejector sleeve and air-breathing are realized by the cooperation of the cooperation of block and L-shaped seat mouth, limited post and L-shaped groove Pipe it is removable, to be replaced while realizing sucker, push away circle, air intake duct and ejector sleeve.

2. part replacement according to claim 1 is convenient and can avoid the set of cross-infection bundle syringe, it is characterised in that： Including by battery（20）, power switch（21）With multiple headlamps（22）The lighting device of composition, battery are set to shell（1） In, power switch is fixed on the rear end of shell, and shell is fixedly arranged at the front end with front apron（23）, the front end of headlamp passes through front apron （23）, the conducting wire on power output end is powered headlamp through power switch.

3. part replacement according to claim 2 is convenient and can avoid the set of cross-infection bundle syringe, it is characterised in that： The front apron（23）Positioned at connecting cylinder（18）Periphery, L-shaped groove（33）It is opened on the connecting cylinder on the outside of front apron, so that Limited post（19）It is visible with the connection state of L-shaped groove.

4. part replacement according to claim 1 or 2 is convenient and can avoid the set of cross-infection bundle syringe, feature exists In：The gear set（9）Upper gear wheel（26）, the first pinion gear（27）Modulus with the second pinion gear is 1~1.5.

5. part replacement according to claim 1 or 2 is convenient and can avoid the set of cross-infection bundle syringe, feature exists In：The piston（4）By front limit plate（29）, rear position margining plate（30）And first between front limit plate and rear position margining plate Cushion rubber（28）Composition, the cylinder（3）The diameter of internal cavities is gradually reduced by front end to rear end.

6. part replacement according to claim 1 or 2 is convenient and can avoid the set of cross-infection bundle syringe, feature exists In：The ejector sleeve（6）Rear end be fixed with ejector sleeve housing（31）, block（17）It is fixed on outside ejector sleeve and puts on；Air intake duct（5）After End is fixed with air intake duct housing（36）, limited post, which is fixed on outside air intake duct, to be put on, and is provided with and is connected in the middle part of air intake duct outer barrel Cylinder（18）Inner cavity interference fit the second cushion rubber（37）.

7. part replacement according to claim 1 or 2 is convenient and can avoid the set of cross-infection bundle syringe, feature exists In：The sucker（7）On offer and air intake duct（5）The jack being connected（39）, the front end of jack is empty with the inside of sucker The through-hole that chamber communicates（38）, the jack is by outside to the decreasing pore size between through-hole, to realize air intake duct and sucker Securely connection.

8. part replacement according to claim 1 or 2 is convenient and can avoid the set of cross-infection bundle syringe, feature exists In：The gear set（9）For integral type gear.

9. part replacement according to claim 1 or 2 is convenient and can avoid the set of cross-infection bundle syringe, feature exists In：The shell（1）On be fixed with upper cover plate（43）, for ease of pushing block between upper cover plate and shell（13）Mobile guiding notch （46）；The groove passed through convenient for upper cover plate is offered on pushing block, and guiding rib is fixed on the groove of pushing block（44）, under upper cover plate It is provided on surface and the matched guide groove of guiding rib（45）.