A kind of injection with low resistanceTechnical field
The present invention relates to medical instruments, particularly relate to a kind of injection with low resistance.
Background technique
Syringe is a kind of common medical instruments.Common syringe has glass syringe and plastic injector, becauseThe processing cost of plastic injector is lower, thus modern medical service syringe majority be it is made of plastic, plastic injector in order toGuaranteeing the sealing effect between piston and cylinder, piston needs to be adjacent to cylinder inboard wall, but piston contacts excessively with cylinder inboard wall,It will increase the resistance of push rod, in some special circumstances, when such as puncture procedure anesthesia, due to the larger resistance of injector push-rod,Operator's hand sense of touch can be reduced, to influence operation judges.
There are many injection with low resistance in the prior art, and some piston configurations are fixed, in cylinder internal pressureWhen excessive, piston compressive deformation will increase the contact area with cylinder inboard wall, to increase resistance；Some syringe pistonsStructure is complicated, needs multiple component combinations together, to increase whole production, assembling cost；Some syringes are livingPlug structure is soft or hard bond material, and existing hard material influences the rebound of flexible material, so that it is residual to cause injector drugSurplus is larger.Generally speaking, existing injection with low resistance using effect is unsatisfactory, needs further to improve and optimizate.
Summary of the invention
The present invention proposes a kind of injection with low resistance, solves that existing injection with low resistance using effect is undesirable to askTopic.
The technical scheme of the present invention is realized as follows: a kind of injection with low resistance, including injection tube and in injection tubeThe push rod and piston of sliding, it is characterised in that: the push rod includes limit section and is arranged section, and limit section includes rotary table portion, setIf section is equipped with piston, piston includes ring taps body, and the outside of ring taps body is equipped with outward flange, and the inside of ring taps body is equipped with fitting groove,Rotary table portion and fitting groove cooperate.
The limit section includes conus portion, and conus portion is connect with rotary table portion.
The push rod further includes main paragraph and final quotaion section, and main paragraph is connect with section is arranged, and final quotaion section is connect with main paragraph.
The cross section of the main paragraph is cross.
Chamfered groove is equipped in the fitting groove.
Equipped with inward flange in the ring taps body, inward flange cooperates with section is arranged.
The injection tube includes cylinder, and the tail portion of cylinder is equipped with non-slip groove.
The injection tube includes cylinder, and the tail portion opening of cylinder is equipped with clamp flange.
The clamp flange includes segmental arc and oblique line section.
Advantages of the present invention: while guaranteeing the tightness of piston, enabling to contact of the piston with cylinder less, hindersPower is smaller, easily facilitates the use of operator；Inward flange is set in the middle part of ring taps body, is that middle part is striven for more than more deformationAmount, further decreases resistance when operation.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show belowThere is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only thisSome embodiments of invention for those of ordinary skill in the art without creative efforts, can be withIt obtains other drawings based on these drawings.
Fig. 1 is schematic structural view of the invention.
Fig. 2 is pusher structure schematic diagram of the present invention.
Fig. 3 is inventive piston structural schematic diagram.
Fig. 4 is injection tube structural schematic diagram of the present invention.
Fig. 5 is the top view of Fig. 4.
In figure: 1- push rod, 2- piston, 3- injection tube, 11- limit section, 111- conus portion, 112- rotary table portion, 12- are arrangedSection, 13- main paragraph, 14- final quotaion section, 21- ring taps body, 22- outward flange, 23- fitting groove, 24- chamfered groove, 25- inward flange, 31-Body, 32- non-slip groove, 33- clamp flange, 331- segmental arc, 332- oblique line section.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, completeSite preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based onEmbodiment in the present invention, those of ordinary skill in the art are obtained every other under that premise of not paying creative laborEmbodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, a kind of injection with low resistance, including push rod 1, piston 2 and injection tube 3, piston 2 are set in push rod 1On, when push rod 1 slides up and down, piston 2 and injection tube 3 are formed and are sealed, and realize the function of sucking and injection medicament.
As shown in Fig. 2, the push rod 1 includes limit section 11, is arranged section 12, main paragraph 13 and final quotaion section 14, section is limited11 include conus portion 111 and rotary table portion 112 again, and conus portion 111 is located at head and connect with rotary table portion 112, and rotary table portion 112 is to fallSet, the angled end-face in rotary table portion 112 and piston 2 cooperate, can gradually clamping piston, realize better seal, and pass through rotary table portion112 lower end surface seized piston 2 realizes the limit to piston 2, and rotary table portion 112 connect with section 112 is arranged, is arranged section 112 and is used forIt is arranged piston 2, section 112 is arranged and is connect with main paragraph 113, the cross section of main paragraph 113 is cross, while transmitting thrustMaterial can be saved, main paragraph 113 is connect with final quotaion section 114, and final quotaion section 114 is circular plate, is pushed away for pressing or pullingBar.
As shown in figure 3, the piston 2 includes ring taps body 21, outward flange 22, fitting groove 23, chamfered groove 24 and inward flange 25,Outward flange 22 is located on the outside of the upper end of ring taps body 21, outward flange 22 for being contacted with injection tube 3, formed piston and injection tube 3 itBetween sealing, fitting groove 23 is opened on the inside of the upper end of ring taps body 21, the lower end surface of fitting groove 23 and the lower end surface in rotary table portion 112It is engaged, the angled end-face of the perpendicular end face and rotary table portion 112 of fitting groove 23 is engaged, and rotary table portion 112 acts on fitting groove 23Place limits the retraction of outward flange 22 by rotary table portion 112, guarantees the stabilization of sealing, and chamfered groove 24 is opened in the turning of fitting groove 23Place, provides more margin for the deformation of ring taps body 21, further reduces resistance, inward flange 25 is located in the middle-end of ring taps body 21Side, inward flange 25 can optimize the sealing and deformation of ring taps body 21, into one to provide bigger distortion allowance in the middle part of ring taps bodyThe attenuating resistance of step.
As shown in Figures 4 and 5, the injection tube 3 includes cylinder 31, non-slip groove 32 and clamp flange 33, and non-slip groove 32 is located atOn 31 tail portion wing plate of cylinder, holding of the finger to cylinder is improved, clamp flange 33 is located at 1 tail end opening of cylinder, can be to push rod 1It is limited, anti-throw-out lever 1 skids off injection tube easily, and specific clamp flange 33 includes segmental arc 331 and oblique line section 332, arcSection 331 can limit push rod 1, but be unlikely to push rod 1 and be difficult to extract out of injection tube 3, and oblique line section 332 is gradually reducedThe bore of opening is stablized convenient for push rod 1 and is entered in injection tube 3.
Syringe of the invention is divided into three kinds of working conditions: static, drawing liquid and injection.
In stationary state, outward flange contacts to form sealing with cylinder inboard wall.In drawing liquid state, lower pulling-pushing rod extracts medicament,Negative pressure is generated in cylinder, outward flange retracts upwards, reduces with the contact area of cylinder inboard wall, reduce the resistance of push rod, whileUnder the limit in rotary table portion stops, when avoiding excessive because of negative pressure, outward flange retracts excessive, contact sealing of the outward flange with cylinder inboard wallFailure, influences the leakproofness of syringe, and push rod drop-down stops, and the intracorporal negative pressure of cylinder is gradually reduced, outward flange rebound, outward flange withThe contact of cylinder inboard wall restores.In injection state, upper push rod, outward flange by medical fluid in cylinder extruding and spreading, with cylinderThe contact of internal wall increases, and improves the leakproofness of piston, until push rod above pushes away stopping, the intracorporal pressure of cylinder is gradually decreased, flangeRebound, contact of the flange with cylinder inboard wall restore.
Syringe of the invention is compared with existing syringe, when lower pulling-pushing rod, while guaranteeing the tightness of piston, and energyEnough so that contact of the piston with cylinder is less, resistance is smaller, easily facilitates the use of operator.In being arranged in the middle part of ring taps bodyFlange strives for more distortion allowances for middle part, further decreases resistance when operation.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the inventionWithin mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.