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CN102631732A - Low-resistance piston component of syringe - Google Patents

Low-resistance piston component of syringe Download PDF

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Publication number
CN102631732A
CN102631732A CN 201210089838 CN201210089838A CN102631732A CN 102631732 A CN102631732 A CN 102631732A CN 201210089838 CN201210089838 CN 201210089838 CN 201210089838 A CN201210089838 A CN 201210089838A CN 102631732 A CN102631732 A CN 102631732A
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CN
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piston
recess
press
plate
end
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CN 201210089838
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Chinese (zh)
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CN102631732B (en )
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朱乔平
陈巧芳
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杭州龙德医用器械有限公司
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Abstract

The invention discloses a low-resistance piston component of a syringe, which comprises a piston and a connector. The piston is provided with a piston inner hole, and the connector is sleeved in the piston inner hole; at least the front end of the piston is provided with a recess; the connector is provided with a press plate corresponding to the recesses and a neck corresponding to the piston inner hole; the press plate is provided with a conical peripheral surface with the large outer end and the small inner end, and the diameter of the outer end of the press plate is larger than that of a front port of each recess; the depth of each recess is equal to the thickness of the press plate; the length difference between the connector and the piston is equal to the depth of each recess; and a lip is arranged on the outer peripheral edge of each end, with the corresponding recess, of the piston. Due to expansion of air pressure in cavities at front and rear ends of the piston during pushing and pulling and squeezing of the press plate, the piston is adaptive to the pressure of a hole wall in a jacket, and push-and-pull resistance of the syringe is reduced.

Description

一种注射器低阻力活塞组件 A syringe piston assembly low resistance

技术领域 FIELD

[0001] 本发明涉及一种注射装置,特别是涉及一种注射器的低阻力活塞组件,其与注射器外套和推杆配合形成低阻力注射器。 [0001] The present invention relates to an injection device, particularly to a low resistance of the piston of the syringe assembly with the syringe plunger jacket and form a low resistance syringe.

背景技术 Background technique

[0002] 注射器是一种常用的医疗器械。 [0002] The injector is a commonly used medical devices. 通常注射器包括外套和活塞推杆。 Typically includes jacket and syringe piston push rod. 为了得到一个较好的密封效果,活塞需要与外套内壁进行较紧的贴合。 In order to obtain a good sealing effect, the piston needs to be a tight fit with the inner wall of the jacket. 其结果是操作者操作非常困难,极大地增加了使用者的劳动强度。 As a result, the operator is very difficult to operate, greatly increasing the labor intensity of the user. 公告号为CN100435871C的中国发明专利公开了一种低阻力注射器,包括注射筒身和在筒身内滑动的推液柱塞,活塞为环形密封圈,密封圈的端面沿其圆周方向设有一圈开口槽;活塞固定装置具有设置在密封圈上方的嵌合部件和设置在密封圈下方的支撑部件,嵌合部件的边沿设有一圈下端正好嵌在密封圈端面开口槽内的凸缘,支撑部件将密封圈固定在嵌合部件下方。 Announcement No. CN100435871C ​​Chinese invention patent discloses a low resistance syringe comprising a syringe body and the plunger was pushed in the barrel to slide, an annular piston seal, face seals an opening provided with a ring groove in a circumferential direction thereof ; fixing device having a piston and a fitting member disposed above the sealing ring is disposed in the support member beneath the seal ring, the fitting member is provided with a ring edge of the lower end of the flange ring just fitted in the opening end surface of the groove, the supporting sealing member ring in the lower fitting member. 采用这种结构的注射器,密封圈会随筒体内空气压力的改变挤开涨大或回弹缩小,它与注射筒体内壁间的接触面就会随筒体内空气压力的改变而改变,用该种密封圈作注射器活塞,其灵敏度较高,筒体内压力一有变化,密封圈就会挤开涨大或回弹缩小,从而达到低阻力、强密封的目的。 With this configuration of the syringe, the seal ring will vary with changes in air pressure within the cylinder to open up a large squeeze or reduce the rebound, the syringe body walls which contact surface will change as the air pressure within the cylinder is changed, with the species seal for syringe piston, a high sensitivity, a barrel pressure changes, will squeeze the seal swell and shrink or rebound, so as to achieve low resistance, sealing purposes. 由于该注射器的活塞是采用其上的一圈开口槽和一嵌合部件实现的。 Since the piston of the syringe is the use of a circle on which the open groove and a fitting member implemented. 嵌合部件在将活塞向外撑开的同时也向内撑开,使活塞的内孔缩紧在推杆的外周。 Also the fitting member while the expansion piston inwardly outwardly distraction, the tightening of the inner bore of the piston in the outer periphery of the push rod. 因此,该活塞结构的注射器在推杆拉动时会与活塞扣紧锁死,嵌件也不再使活塞向外撑开,不能达到与筒身的密封。 Thus, the plunger of the syringe fastening structure will lock the piston in the push rod is pulled, the insert is no longer the expansion piston outwardly can not reach the seal with the barrel.

发明内容 SUMMARY

[0003] 本发明要解决的技术问题是提供一种注射器低阻力活塞组件,其通过对该组件的结构进行改进,使注射器在推杆推动时活塞与外套的密封压力取决于外套前腔内的压力,因此,当注射器缓慢推动时具有较小的阻力。 [0003] The present invention is to solve the technical problem of providing a low resistance syringe piston assembly, by the improved structural assembly of the syringe upon pushing the plunger piston and the sealing pressure is dependent on the outer jacket of the front chamber pressure, therefore, has little resistance when driven syringe slowly. 而采用一连接头与活塞配合的活塞组件结构,使推杆在拉动时,活塞只向外撑开与外套产生有效密封,同样,该密封压力取决于推杆拉动时的速度。 The use of the piston assembly the piston structure with a connector of the push rod is pulled in, only the expansion piston and the jacket to produce an effective seal outwardly, likewise, depends on the speed of the sealing pressure at the plunger is pulled. 因此,当使用者缓慢拉动推杆时,具有较小的阻力。 Thus, when the user pulls the plunger slowly, with little resistance. 从而利用本发明的注射器可实现减轻使用者的劳动强度的目的。 With the present invention such that the syringe can be achieved to reduce labor intensity of the user.

[0004] 本发明的上述技术问题主要是通过下述技术方案得以解决的:一种注射器低阻力活塞组件,包括设有一活塞内孔的活塞和套设在所述活塞内孔中的连接头;至少在所述活塞的前端设有一凹陷;所述连接头设有一对应所述凹陷的压板和对应所述活塞内孔的颈部;所述压板设有外端大内端小的圆锥周面,并且压板的外端直径大于所述凹陷的前端口直径;所述凹陷的深度等于所述压板的厚度;所述连接头与所述活塞的长度差等于所述凹陷的深度;在所述活塞设有凹陷端的外周边上设有一唇边。 [0004] The technical problem of the present invention is mainly solved by the following technical solutions: one low resistance syringe piston assembly comprising a piston provided with a piston bore and a sleeve disposed in the bore of the piston head is connected; at least one recess is provided at the front end of the piston; the connecting head is provided with a recess in said press plate corresponding to the inner bore of the piston corresponding to the neck portion; said platen is provided with an outer peripheral surface has a conical inner end of the large end, and the outer diameter of the end of the platen greater than the previous port diameter of the recess; the recess depth equal to the thickness of the platen; the difference in length of the connection head and the piston is equal to the depth of the recesses; provided in the piston It is provided with a lip on the outer Zhou Bian the recessed end. 通过活塞在推拉时前后端腔室的空气压力胀开和压板挤压,使活塞自适应与注射器的外套内孔壁的压力,减少了注射器的推拉阻力。 Front and rear ends of the piston by the air pressure of the expansion chamber opening and the platen pressed during sliding, the piston and syringe adaptive pressure within the outer wall of the hole, reducing the sliding resistance of the syringe.

[0005] 为了使压板有效挤压活塞前端上的凹陷并防止压板与凹陷挤压咬死,所述凹陷呈倒圆锥台,该凹陷的圆锥角小于所述压板的圆锥角,其角度差为5〜15度。 [0005] In order to effectively platen pressing recess on the front end of the piston and prevents the pressing plate and pressing killed recess, said recess has an inverted truncated cone, the cone angle is smaller than the recessed cone angle of the platen, which angle difference is 5 ~ 15 degrees. [0006] 作为进一步的优选技术方案,在所述活塞另一端面上设有一端面凸环;所述端面凸环的高度小于所述凹陷的深度。 [0006] As a further preferred aspect, the end face is provided with a collar at the other end face of the piston; the height of the end face of the collar is less than the depth of the recess. 当推杆推动时用于与推杆的密封,并使连接头在推杆推动下压板从凹陷中脱出,由活塞前端腔室的压力对活塞作自适应胀开,实现低阻力注射。 When pushing the push rod and the push rod for sealing, and connector from coming out of the recess in the pressure plate at the push rod driven by the piston pressure chamber to the front end of the piston as adaptive inflation opening, low resistance injection.

[0007] 作为进一步的优选技术方案,所述唇部截面包括靠近所述活塞前端面的弧形段和远离所述活塞前端面的平直段;所述平直段与所述活塞的外周面的夹角为120〜160度。 [0007] As a further preferred aspect, the cross-section comprises a lip portion adjacent the arcuate section and the front end surface of the piston away from the straight segment of the front end surface of the piston; the outer circumferential surface of the piston straight segment the angle of 120~160 degrees. 通过该结构的唇部设置,使活塞在推动和拉动时与外套内孔壁具有较一致的压力。 By setting the configuration of the lip portion, the piston and the inner wall of the outer bore having a more consistent pressure when pushing and pulling.

[0008] 为了进一步增强连接头与活塞的密封性,所述活塞内孔中设有至少一道与所述颈部密封接触的密封凸环。 [0008] In order to further strengthen the connection head and the sealing piston, said piston bore is provided with at least one sealing contact with the sealing rim of the neck.

[0009] 作为进一步的优选技术方案,所述连接头后端设有一轴向的连接孔,连接孔中设有一内凸环;在所述注射器的注射杆头端设有一与所述内凸环卡接的外凸环。 [0009] As a further preferred aspect, the rear end of the connector is provided with an axial connection hole, the connection hole is provided with a convex ring; provided at the injection end of the syringe head with a convex inner ring the convex snap ring. 通过该卡接结构,推杆可较容易地卡入连接头中,实现活塞在外套中的推拉动作。 By the engagement structure, the push rod can be more easily snapped into the connection head, to achieve the sliding movement of the piston in the jacket.

[0010] 本发明的技术方案,采用活塞前端上的凹陷和连接头上的压板,实现对活塞在推拉时与外套内孔壁的挤压压力自适应,实现注射器在使用时的低阻力。 [0010] aspect of the present invention, a pressure plate connected to the recess and the front end of the piston head, the piston adaptive realize the extrusion pressure jacket wall of the bore during sliding, low resistance to achieve a syringe during use. 同时,通过唇部的结构优化,使注射器在推动和拉动动作时具有较一致的挤压压力。 At the same time, by optimizing the structure of the lip, the syringe having a more uniform pressing pressure when pushing and pulling action.

附图说明 BRIEF DESCRIPTION

[0011] 图I为包括本发明的注射器结构示意图。 [0011] Figure I is a schematic view of the structure of the present invention comprises a syringe.

[0012] 图2为本发明的结构示意图。 [0012] FIG. 2 is a schematic structural diagram of the invention.

[0013] 图3为本发明中活塞的结构示意图。 [0013] FIG. 3 is a schematic structure of a piston of the present invention.

[0014] 图4为本发明中连接头的结构示意图。 [0014] FIG. 4 is a schematic structural diagram of the connector of the present invention.

[0015] 图5为本发明中外套的结构示意图。 [0015] FIG. 5 is a schematic structural diagram of the invention coat.

[0016] 图6为本发明中推杆的结构示意图。 [0016] FIG. 6 is a schematic structural diagram of the invention the push rod.

[0017] 其中,外套I、前腔101、前腔端面1011、后腔102、推杆2、连接部201、外凸环202、肩胛部203、折断口204、活塞3、凹陷301、凹陷周面3011、凹陷端口3012、唇部302、弧形段3021、平直段3022、活塞内孔303、密封凸环304、端面凸环305、凹陷圆锥角α、连接头4、压板401、压板周面4011、压板端面4012、压板圆锥角β、颈部402、连接孔403、内凸环404。 [0017] wherein, coat I, front chamber 101, the front end surface of the chamber 1011, the chamber 102, the push rod 2, the connecting portion 201, the convex ring 202, shoulder portion 203, broken port 204, the piston 3, the recess 301, the circumferential recess surface 3011, a recessed port 3012, the lip 302, arcuate segments 3021, 3022 straight section, the inner hole of the piston 303, the seal collar 304, the collar end surface 305, recessed cone angle [alpha], the connection head 4, a platen 401, platen weeks surface 4011, 4012 end faces of the pressure plate, the pressure plate cone angle beta], the neck portion 402, connection hole 403, the convex ring 404.

[0018] 下面通过实施例,并结合附图,对本发明的技术方案作进一步具体的说明。 [0018] The following Examples, in conjunction with the accompanying drawings, technical solutions of the present invention will be further specifically described.

具体实施方式 detailed description

[0019] 参见图I和图2,一种注射器低阻力活塞组件,其用于与之配套使用的外套I和与活塞组件连接的推杆2组成低阻力注射器。 [0019] 2. A low resistance syringe piston assembly, for ancillary use coat I and a push rod connected to the piston assembly Referring to FIGS. I and 2 form a low resistance syringe. 其中,活塞组件包括活塞3和套设在活塞3中的连接头4。 Wherein the piston assembly includes a piston 3 and the sleeve 3 is provided in the piston head 4 is connected. 活塞组件与外套I内孔作密封滑动连接,在外套I内孔中形成位于活塞组件前端的前腔101和位于活塞组件后端的后腔102。 The outer piston bore assembly for sealing a sliding connection I, form a front end of the piston assembly is located in a front chamber and a rear chamber 101 rear end of the piston assembly 102 is located in the outer bore I.

[0020] 参见图3和图4,活塞3通过活塞中间的活塞内孔303套设在连接头4的一颈部402上。 [0020] Referring to FIGS. 3 and 4, the piston 3 of the piston bore 303 through the piston sleeve disposed in the middle of a neck portion 402 connected to the head 4. 在活塞3头端设有一凹陷301,在活塞3该凹陷端的外周边上设有一唇部302。 The piston 3 is provided with a concave end 301, a lip 302 is provided on the outer Zhou Bian the recess in the end of the piston 3. 在活塞内孔303靠近凹陷处设有二道密封凸环304,在活塞3后端面上靠近活塞内孔303处设有一道端面凸环305。 Is provided with two recesses close to the sealing rim of the piston 304 within the bore 303, adjacent to the rear end surface of the piston 3 of the piston within the bore 303 is provided with an end surface of the collar 305. 该凹陷301设有一圆锥的凹陷周面3011,其凹陷圆锥角α为50度。 The conical recess 301 is provided with a recessed circumferential surface 3011, which recesses taper angle α is 50 degrees.

[0021] 连接头4的如端为一压板401,在压板401的后端为颈部402,在颈部402中间为一连接孔403,连接孔403中靠近口端处设有一内凸环404。 [0021] The tip 4 is connected to a pressure plate 401, the platen 401 at the rear end of the neck 402, the neck portion 402 to the middle of a connection hole 403, the connecting hole 403 is provided with a port near the end of the convex ring 404 . 在连接头4的压板401外周上设有一个压板周面4011。 401 is provided with a platen on the outer circumference of the circumferential surface of the pressure plate 4011 connected to the head 4. 该压板周面4011为一锥面,设有一个压板圆锥角β,该压板圆锥角β为60度。 The platen 4011 is a tapered peripheral surface with a taper angle beta] platen, the platen beta] cone angle is 60 degrees.

[0022] 凹陷301的凹陷端口3012直径略小于连接头压板401前的直径。 [0022] The recess 301 is slightly less than the diameter of the recess 3012 port diameter before the platen 401 connector. 连接头4通过颈部402套设在活塞内孔303中,通过活塞内孔303中的密封凸环304作密封滑动连接。 Connector 4402 disposed within the bore of the piston sleeve 303, through the inner hole of the piston 303 in the sealing rim 304 for sealing slidably connected by a neck. 连接头4的压板401配合在活塞3的凹陷301中。 Head 4 connected to the pressure plate 401 fitted in the recess 301 of the piston. 由于压板401前端的直径略大于活塞凹陷301端口的直径,并且,压板周面4011的压板圆锥角β大于凹陷周面3011的凹陷圆锥角α,所以压板401的压板周面4011与凹陷端口3012接触,并在连接头4带动下作轴向运动时,压板周面4011挤压凹陷301,使活塞3靠近凹陷端的外周面向外胀开,使唇部302与外套I内孔壁形成密封。 Since the diameter of the leading end of the platen 401 is slightly larger than the diameter of the port 301 of the piston recess, and the platen peripheral surface of the platen 4011 is greater than the cone angle beta] circumferential surface of the recess of the concave cone angle [alpha] 3011, 4011 so that contact with the circumferential surface of the platen 3012 port recess 401 of the platen and when the drive connector 4 mainly as an axial movement, pressing platen circumferential surface of the recess 301 4011, near the outer periphery of the piston 3 facing expander end of the recess opening, so that the lip 302 forms a seal with the outer wall of the bore I.

[0023] 活塞的唇部302的截面包括位于活塞3前端的弧形段3021和紧接弧形段后的平直段3022。 [0023] The cross section of the lip portion of the piston 302 includes a front end of the arcuate section of the piston 3 straight segments 3021 and 3022 after the arcuate segment immediately. 该平直段3022与活塞3外周面的夹角为140度。 The angle between the straight section 3022 and the outer circumferential surface of the piston 3 is 140 degrees. 当活塞组件在推杆2推动下进行推动时,由于该唇部302仅靠前腔101中的压力胀开;而活塞组件在推杆2作用下拉动时,活塞唇部302主要是通过压板401对凹陷301的挤压,其压力往往大于活塞组件在推动时的压力。 When the piston assembly is pushed in the plunger 2 pushed, the lip 302 alone since the pressure chamber 101 before the expansion opening; while the piston assembly is pulled under the action of the push rod 2, the piston lip portion 302 mainly through the platen 401 extrusion of the recess 301, the pressure is often greater than the pressure of the piston assembly is pushed. 因此,该结构的唇部302可使活塞组件不管在推动还是拉动时均具有较一致的压力,实现在推拉均具有低阻力的注射器。 Thus, the structure of the lip portion 302 allows the piston assembly has more uniform pressure regardless of pushing or pulling, push-pull syringe has realized low resistance.

[0024] 参见图5,在外套前腔101有一个前腔端面1011,端面中间设有一注射出口。 [0024] Referring to Figure 5, the front chamber has a front end surface of the outer chamber 101 in 1011, the intermediate end face is provided with an injection outlet. 该前腔端面1011为一大锥角的锥面。 The front chamber is tapered end surface 1011 of a large cone angle. 在连接头4的前端也设有一个压板端面4012,该压板端面4012设有一个与前腔端面1011配合的锥面。 The front end connector 4 is also provided with an end surface of the platen 4012, the end surface of the platen 4012 has a tapered front end surface 1011 of the mating cavity. 使推杆2向前推动后,连接头4的压板端面4012与外套I的前腔端面1011贴合,实现注射或用以排出外套前腔101中的空气。 After the push rod 2 is pushed forward, the pressure plate connected to the head end surface of the front chamber 4 and the jacket 4012 I bonded end surface 1011, injectable or jacket for discharging air in the front chamber 101.

[0025] 参见图6,推杆2的截面呈十字形,在头端设有一个连接部201,在连接部201的稍后位置设有一折断口204。 [0025] Referring to Figure 6, a cross-shaped cross section of the push rod 2 is provided at the head end a connection portion 201, opening 204 is provided with a break at a later position of the connecting portion 201. 该连接部201包括可插入连接头4的连接孔403中的半球头结构,在该连接部201上设有一外凸环202。 The connecting portion 201 may be inserted into the hemispherical head structure comprises a connection hole 403 in the head 4, a convex ring 202 is provided on the connecting portion 201. 该连接部201截面也呈十字形,外凸环202呈断续的四个部分。 The connecting portion 201 is also cross-shaped cross section, convex portion of the ring 202 as a four intermittent. 推杆2通过该连接部201上的外凸环202与连接头4连接孔403中的内凸环404配合与连接头4连接。 Convex push rod 2 through the connecting portion 201 on the ring 202 and the connection hole 403 in the inner ring 4 protruding connector 404 and the mating connector 4 is connected. 在连接部201的后端设有一肩胛部203,当推杆2在外套I中推动时与活塞3上的端面凸环305相抵,形成端面密封。 At the rear end portion of the connection portion 201 is provided with a scapular 203, when the push rod 2 is pushed in the outer end surface of the convex I with the piston 3 against the ring 305, an end surface sealing. 注射器在使用完后,可通过推杆2上的折断口204折断推杆,防止注射器的重复使用。 Syringe after use, the plunger breaking through port 204 on the broken plunger 2, to prevent reuse of the syringe.

[0026] 注射器在使用时,通过推动推杆2使活塞组件沿外套I内孔壁向前移动,由于在前腔101中存在空气,活塞组件移动时产生的空气压力在凹陷301中挤压,使活塞唇部302与外套I内孔壁贴紧,形成密封。 [0026] When using the syringe, the piston 2 by pushing the plunger assembly moves forwardly along the outer wall of the bore I, due to the presence of air in the front chamber 101, the air pressure generated when the piston assembly moves in a pressing recess 301, outer lip portion 302 of the piston I with the wall of the bore close contact, forming a seal. 由于该唇部302与外套I内孔壁的密封压力来自前腔101的空气压力,因此,使活塞组件在外套I内孔壁中的移动具有较小的阻力。 Since the lip 302 and the outer wall of the bore I sealing pressure from the air pressure in the front chamber 101, and thus the piston assembly has less resistance in moving the outer wall of the inner bore I. 而当通过推杆2拉动活塞组件进行抽取动作时,推杆2通过内凸环404和外凸环202拉动连接头4,使连接头4上的压板401挤压凹陷301,与活塞凹陷处形成有效密封,同时,活塞3上的唇部302向外胀开与外套I内孔壁形成有效密封。 When the push rod 2 decimation operation by pulling the piston assembly, the push rod 2404 and the convex ring 202 is pulled through the inner connection mouth ring projections 4, the platen 401 is connected to the extrusion head 4 a recess 301 formed in the piston recess an effective seal, while the lip 302 on the piston 3 and the jacket I outwardly bulging apart wall of the bore form an effective seal. 唇部302向外胀开的程度取决于压板401对凹陷301的挤压程度。 The degree of expansion of the lip 302 outwardly apart recessed extent depends on the platen 401 pairs extrusion 301. 因此,速度越慢则该活塞组件与外套I内孔壁的阻力就越小。 Thus, the slower the smaller is the resistance of the piston assembly and the outer wall of the inner bore I. 压力取决于活塞组件在外套I中的移动速度。 Pressure depends on the speed of movement of the piston assembly in the jacket I is.

[0027] 上述实施例是为了更清楚地理解本发明,并不作为对本发明权利的一种限制,在不脱离本发明宗旨的前提下,可以有各种各样的变化,所有这些对所述领域技术人员显而易见的修改将包括在本权利要求的范围之内。 [0027] The embodiment examples are intended to more clearly understand the present invention, not as a limitation on the claims of the present invention, without departing from the spirit of the present invention is provided, you can have a variety of changes, all of the modifications apparent to those skilled be included within the scope of the claims.

Claims (10)

1. 一种注射器低阻力活塞组件,其特征在于:包括设有一活塞内孔的活塞和套设在所述活塞内孔中的连接头;至少在所述活塞的前端设有一凹陷;所述连接头设有一对应所述凹陷的压板和对应所述活塞内孔的颈部;所述压板设有外端大内端小的圆锥周面,并且压板的外端直径大于所述凹陷的前端口直径;所述凹陷的深度等于所述压板的厚度;所述连接头与所述活塞的长度差等于所述凹陷的深度;在所述活塞设有凹陷端的外周边上设有一唇边。 A low resistance syringe piston assembly, comprising: a piston provided with a piston bore and a sleeve disposed in the bore of the piston head is connected; at least one recess is provided at the front end of the piston; the connection head is provided with a recess corresponding to said platen and corresponding to the neck portion of the inner bore of the piston; the platen is provided with an outer end of the small end of the conical inner circumferential surface of the large and the outer diameter of the end of the pressing plate is greater than the diameter of the recess of the front port ; the recess depth equal to the thickness of the platen; the difference between the length of the connector is equal to the depth of the recess of the piston; and a lip provided on an outer periphery of the piston end is provided with a recess.
2.根据权利要求I所述的低阻力活塞组件,其特征在于:所述凹陷呈倒圆锥台,该凹陷的圆锥角小于所述压板的圆锥角,其角度差为5〜15度。 Low resistance according to claim I of the piston assembly, wherein: said recess has an inverted truncated cone, the cone angle is smaller than the recessed cone angle of the platen, which angle difference is 5~15 degrees.
3.根据权利要求I或2所述的低阻力活塞组件,其特征在于:在所述活塞另一端面上设有一端面凸环;所述端面凸环的高度小于所述凹陷的深度。 According to claim I or low resistance of the piston assembly of claim 2, wherein: the end face is provided with a collar at the other end face of the piston; the height of the end face of the collar is less than the depth of the recess.
4.根据权利要求I或2所述的低阻力活塞组件,其特征在于:所述唇部截面包括靠近所述活塞前端面的弧形段和远离所述活塞前端面的平直段;所述平直段与所述活塞的外周面的夹角为120〜160度。 According to claim I or low resistance of the piston assembly of claim 2, wherein: said cross section comprising a lip portion adjacent the front end surface of the piston away from said arcuate segments and straight segments distal end surface of the piston; the the angle between the straight section and the outer circumferential surface of the piston is 120~160 degrees.
5.根据权利要求3所述的低阻力活塞组件,其特征在于:所述唇部截面包括靠近所述活塞前端面的弧形段和远离所述活塞前端面的平直段;所述平直段与所述活塞的外周面的夹角为120〜160度。 The low resistance of the piston assembly of claim 3, wherein: said cross section comprising a lip portion adjacent the front end surface of the piston arcuate segments and straight segments away from the front face of the piston; the flat the angle between the outer circumferential surface of the section of the piston is 120~160 degrees.
6.根据权利要求I或2所述的低阻力活塞组件,其特征在于:所述活塞内孔中设有至少一道与所述颈部密封接触的密封凸环。 According to claim I or low resistance of the piston assembly of claim 2, wherein: the inner bore of the piston is provided with at least one sealing rim in sealing contact with the neck.
7.根据权利要求3所述的低阻力活塞组件,其特征在于:所述活塞内孔中设有至少一道与所述颈部密封接触的密封凸环。 The low resistance of the piston assembly of claim 3, wherein: the inner bore of the piston is provided with at least one sealing rim in sealing contact with the neck.
8.根据权利要求4所述的低阻力活塞组件,其特征在于:所述活塞内孔中设有至少一道与所述颈部密封接触的密封凸环。 Low resistance according to claim 4, wherein the piston assembly, wherein: the inner bore of the piston is provided with at least one sealing rim in sealing contact with the neck.
9.根据权利要求5所述的低阻力活塞组件,其特征在于:所述活塞内孔中设有至少一道与所述颈部密封接触的密封凸环。 Low resistance according to claim piston assembly of claim 5, wherein: the inner bore of the piston is provided with at least one sealing rim in sealing contact with the neck.
10.根据权利要求5所述的低阻力活塞组件,其特征在于:所述连接头后端设有一轴向的连接孔,连接孔中设有一内凸环;在所述注射器的注射杆头端设有一与所述内凸环卡接的外凸环。 10. The piston assembly as claimed in claim 5, wherein the low resistance, characterized in that: said rear connector is provided with an axial connection hole, the connection hole is provided with a convex ring; injection head end of the syringe a protrusion provided with the inner ring of the outer convex annular snap.
CN 201210089838 2012-03-30 2012-03-30 Low-resistance piston component of syringe CN102631732B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104759005A (en) * 2015-04-21 2015-07-08 山东淄博山川医用器材有限公司 Low-resistance injector piston and injector

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026287A (en) * 1975-12-10 1977-05-31 Irene Haller Syringe with retractable cannula
US6004300A (en) * 1997-08-28 1999-12-21 Butcher; Robert M Composite hypodermic syringe piston
CN1736501A (en) * 2005-09-09 2006-02-22 余利荣 Injection with low resistance
CN201143332Y (en) * 2008-01-27 2008-11-05 房东森 Disposable syringe piston
CN202605444U (en) * 2012-03-30 2012-12-19 杭州龙德医用器械有限公司 Low-resistance piston assembly of syringe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026287A (en) * 1975-12-10 1977-05-31 Irene Haller Syringe with retractable cannula
US6004300A (en) * 1997-08-28 1999-12-21 Butcher; Robert M Composite hypodermic syringe piston
CN1736501A (en) * 2005-09-09 2006-02-22 余利荣 Injection with low resistance
CN201143332Y (en) * 2008-01-27 2008-11-05 房东森 Disposable syringe piston
CN202605444U (en) * 2012-03-30 2012-12-19 杭州龙德医用器械有限公司 Low-resistance piston assembly of syringe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104759005A (en) * 2015-04-21 2015-07-08 山东淄博山川医用器材有限公司 Low-resistance injector piston and injector

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