WO2015070524A1 - 回拉式可换针安全自毁注射器 - Google Patents
回拉式可换针安全自毁注射器 Download PDFInfo
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- WO2015070524A1 WO2015070524A1 PCT/CN2014/001011 CN2014001011W WO2015070524A1 WO 2015070524 A1 WO2015070524 A1 WO 2015070524A1 CN 2014001011 W CN2014001011 W CN 2014001011W WO 2015070524 A1 WO2015070524 A1 WO 2015070524A1
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- needle
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- pull
- wall
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
- A61M5/3221—Constructional features thereof, e.g. to improve manipulation or functioning
- A61M2005/323—Connection between plunger distal end and needle hub proximal end, e.g. stud protruding from the plunger
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/34—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub
- A61M5/347—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub rotatable, e.g. bayonet or screw
Definitions
- the utility model relates to the technical field of medical instruments, in particular to a pull-back type needle-changeable self-destructing syringe, in particular to a mechanical connection structure thereof.
- a needle pull-back type safe self-destructing syringe including a cylinder, the end of the cylinder barrel
- the needle body is provided in the neck, the core body is provided in the cylinder body, and the rubber rod is disposed near the end of the core rod, wherein the upper part of the needle seat body is placed in the neck of the cylinder, and the middle part of the needle seat body forms an elastic sealing limit
- the lower part of the needle seat body is connected with the outer casing type pull-back locking component, and the surface of the elastic sealing limit portion is provided with an annular buffer gap, and the outer wall of the elastic sealing limit portion outside the annular buffer gap forms an annular sealing limit engagement.
- the end of the core rod is provided with an asymmetric elastic locking pullback member.
- the function of retracting the needle by using the barb body is realized, and the safe injection is realized.
- the barb body is a metal piece or a plastic piece.
- Metal parts need to be processed and matched or assembled with the core rod.
- the manufacturing process is complicated, difficult and not stable, which not only increases the processing steps and manufacturing costs, but also increases the safety and product quality of the metal parts themselves and their assembly process. Uncertainty in terms of hidden dangers.
- Existing plastic barbs still have defects or imperfections in structure, which leads to safety hazards or safety holes in the use of the product.
- the existing plastic inverted fastener design can realize the needle pullback function, but in use, the needle is still in a normal trajectory after being pulled back, and the needle may be pushed out again to cause the user to be damaged twice.
- the traditional single-needle seat back-pull safety self-destructing syringe or safety syringe has the same problem, that is, how to solve the stability of the inner needle seat and the cylinder and achieve a certain strength to meet the stability requirements;
- the tension required when returning the needle holder should not be too large for ease of use.
- the rigid mating structure can achieve a stable locking effect of the inner needle seat and the inner wall of the cylinder, it is difficult or even impossible to achieve the convenience of use at the same time.
- the instability of the plastic material itself and the characteristics that are subject to changes in the ambient temperature result in poor stability of the product of the hard-fit structure, and the quality and precision in the production process are difficult to control, and mass production is almost impossible.
- the improved syringe structure in the comparative document can basically achieve the stability requirement between the barrel and the barrel
- a sealing ring should be assembled between the inner needle holder and the syringe barrel to achieve the sealing function, and the sealing rubber ring is provided.
- the method and position directly affect the sealing effect of the syringe and the residual amount of the liquid during the injection.
- the existing inner needle sealant ring is displaced during transportation and use, and the residual amount of the liquid is not ideal.
- the purpose of the utility model is to provide a pull-back type needle-changeable self-destructing syringe, which can be locked with the syringe barrel by an elastic buffering engagement mechanism.
- the cushioning clearance of the engaging portion and the plasticity of the engaging member are skillfully utilized to perfectly achieve the locking and disengaging effects of the two.
- the elastic buffering engagement mechanism can be disposed at the upper and lower needle holders of the double needle seat, or at the inner wall of the cylinder, and the shape, size, thickness or position of the elastic buffer body can be changed according to the overall design of the product; In this way, as long as the corresponding elastic cushioning mechanism is formed at the inner needle seat or the inner wall of the cylinder at the same time.
- the end of the plunger of the syringe is provided with an elastic locking function, and the locking member can be locked with the inner cavity of the lower needle seat of the double needle seat of the syringe.
- the sealing rubber ring assembly part is formed between the upper and lower needle holders, so that the sealing assembly structure is more stable, and the indented rubber ring assembly structure can effectively prevent leakage and further reduce the residual amount of the liquid medicine, thereby overcoming the existing The shortcomings and deficiencies in the technology.
- a pull-back type needle-changeable self-destructing syringe which comprises a cylinder body, and a core rod is arranged in the cylinder body, and a rubber plug is sleeved near the upper end portion of the core rod.
- the needle neck of the upper end of the cylinder body is provided with a needle-removable elastic buffer upper needle seat at the upper portion and a lower needle seat at the lower portion, and the two are integrally connected by a sleeve-fitting manner, wherein the needle can be replaced.
- the upper part of the needle seat of the elastic buffer forms a 6:100 taper sleeve sleeve, and the outer sleeve of the needle sleeve forms an inner spiral sleeve.
- the needle seat sleeve is located at the center of the inner spiral sleeve, and the inner wall of the inner spiral sleeve forms an internal thread.
- the elastically sealed limit ring body is formed on the outer wall of the needle sleeve of the elastic buffer, and the elastic seal limit ring body and the inner spiral sleeve are reversely distributed, and the bottom of the elastic sealing ring body and the inner spiral sleeve are elastically sealed.
- the bottom portion forms a connecting portion, and an annular elastic buffering gap is formed between the inner wall of the elastic sealing limiting ring and the outer wall of the needle-retaining elastic buffering upper sleeve, and an annular elastic sealing limit portion is formed at the outer wall of the elastic sealing limiting ring body, and the ring Elastic seal limit
- the surface of the portion has an arc-shaped bulge
- the lower needle seat has a cylindrical shape
- a lower limit hole is formed at a lower portion of the lower needle seat near the outer edge
- an annular gap is formed between the limit insertion ring and the outer wall of the lower needle seat, and can be exchanged.
- the lower end of the needle elastic buffer upper sleeve is located in the annular gap, and the annular sealing ring assembly portion is formed between the floating end of the elastic sealing limit ring body and the upper end of the limiting insert ring, and the sealing rubber ring is located in the annular sealing rubber ring
- the inner cavity of the lower needle seat is hollow, and an annular locking ring is formed at the inner wall of the hollow inner cavity.
- the upper surface of the annular locking ring forms an annular locking groove
- the lower surface of the annular locking ring forms an annular guiding inclined surface, which forms an annular guiding
- the inclined surface of the slope forms an angle of 5 degrees to 85 degrees with the horizontal plane
- the core rod The upper end portion is provided with an asymmetric pull-back locking member, the maximum width of the asymmetric pull-back locking member is larger than the inner diameter of the annular locking ring, and the inner diameter of the annular locking ring is 1 mm-15 mm, and the inner wall of the annular locking ring is in the annular locking groove It has elasticity under the influence of it.
- the utility model discloses a pull-back type needle-changeable self-destructing syringe.
- the upper needle seat and the lower needle seat are separated assembly structures or one-time injection molding, and a sealing rubber ring assembly is formed at the outer wall between the upper and lower needle seats.
- the sealing assembly structure is more stable, and the indented rubber ring assembly structure can effectively prevent leakage and further reduce the residual amount of the liquid medicine.
- the end of the syringe core rod used with the needle seat is provided with an asymmetric back with elastic function.
- the locking member; the asymmetrical structure and the elastic function design ensure that the locking member can be smoothly inserted into the inner cavity of the elastic buffer under the elastic buffer, and the elastic expansion function is used to realize the carding of the barb component and the elastic buffer lower needle seat.
- annular lock groove design also has elastic cushioning characteristics, when it is contacted with the asymmetric pull-back lock member (barb member) in the advancing state, both will produce relative cushioning deformation, facilitating the asymmetric pull-back lock member (barb member) ) snapped into the lock groove of the annular locking ring; when the locking member is pulled back, the locking groove of the annular locking ring is locked with each other.
- the needle head is pulled back into the syringe barrel, under the force of the asymmetric force, the whole needle head will be deflected to one side, and the needle will be inverted toward the inner wall of the cylinder in the direction of nearly forty-five degrees.
- the asymmetric elastic pull-back locking member is a plastic barb.
- the plastic barb body adopts a design principle of asymmetry and an elastomer structure, and the specific angle and size design make the barb body have an elastic buffer locking function.
- the above asymmetric elastic pull-back locking member is integrated with the core rod, and the integral component is formed by one-time open molding, and no separate processing or subsequent assembly is required, which effectively reduces the manufacturing cost, simplifies the assembly process, and reduces the assembly process.
- the asymmetric elastic pull-back piece at the end of the core rod has excellent engagement and locking effect on the inner cavity of the needle seat, and the overall structure of the product is reasonable, the concept is clever, the operation is simple, the working state is stable, and the utility model is easy to popularize and apply. Compared with the existing product design and technology, the design has a significant technical breakthrough, and has outstanding safety and practical features.
- Figure 1 is a schematic view of the structure of the present invention.
- FIG. 2 is a schematic view showing the structure of the elastic buffer upper needle seat of the present invention.
- Figure 3 is a schematic view showing the structure of the lower needle seat of the present invention.
- Figure 4 is an assembly view of the upper and lower needle holders of the present invention.
- the utility model relates to a pull-back type needle changeable safety self-destructing syringe. As shown in FIG. 1 , it comprises a cylinder body 1 , and a core rod 2 is arranged in the cylinder body, and a rubber plug 3 is sleeved near the upper end portion of the core rod.
- the upper end of the cylinder 1 is provided with an upper portion
- the needle-retainable elastic buffer upper needle holder 4 and the lower lower needle holder 5 are integrally connected by a sleeve-fitting manner, which is different from the prior art in that the replaceable needle elastically cushions the upper part of the upper needle holder 4
- Forming a 6:100 taper sleeve sleeve 6 the outer sleeve of the needle sleeve 6 is formed with an inner spiral sleeve 7, the needle sleeve 6 is located at the center of the inner spiral sleeve 7, and the inner wall of the inner spiral sleeve 7 is internally threaded.
- the annular elastic sealing limit cylinder 9 is formed at the outer wall of the needle-retaining elastic needle upper needle seat 4.
- the annular elastic sealing limit cylinder 9 and the inner spiral sleeve 7 are reversely distributed, and the annular elastic sealing limit is
- the bottom of the cylinder 9 forms a connecting portion 10 with the bottom of the inner spiral sleeve 7, and an annular elastic buffer gap 11 is formed between the inner wall of the annular elastic sealing limiting cylinder 9 and the outer wall of the needle-retaining elastic buffer upper needle seat 4, and the annular elastic sealing is formed.
- An annular elastic sealing limiting portion 12 is formed on the outer wall of the limiting cylinder 9.
- the surface of the annular elastic sealing limiting portion 12 has an arc-shaped bulging shape
- the lower needle holder 5 has a cylindrical shape
- the lower needle holder 5 has a lower portion near the outer edge.
- annular locking ring 17 is formed at the inner wall of the hollow inner cavity.
- the upper surface of the annular locking ring 17 forms an annular locking groove 18, which is annular.
- the lower surface of the locking ring 17 forms an annular guiding bevel 19 which forms an angle of between 5 and 85 degrees with the horizontal plane, the annular guiding obliquely facing the asymmetrical pull-back locking member of the end of the core rod (the barb member) has a guiding function, and at the same time, the barb member is guided to deform when sliding into the inner cavity of the needle seat, and at the same time, when the needle seat is pulled into the inner cavity of the needle body, deflection is performed to one side, and the annular guiding inclined surface 18 can
- the space required for the deflection is left, and the upper end of the core rod 2 is provided with an asymmetric pull-back locking member 20, the maximum width of the asymmetric pull-back locking member 20 is larger than the inner diameter of the annular locking ring 17, and the inner diameter of the annular locking ring 17 1mm-15mm, the inner wall of the annular locking ring 16 is in the ring lock groove 18 has elasticity under the action of 18.
- the asymmetric pull-back locking member 20 is a plastic barb or a metal barb, and the barb can cooperate with the annular locking groove 18 on the upper surface of the annular locking ring 17, and the hook end of the barb body Locked in the annular lock slot 18.
- the cross-section of the annular lock groove 18 is approximately triangular in shape to facilitate the locking of the barb.
- the inner cavity of the upper portion of the needle-retaining elastic sleeve is hollow, and the inner wall of the hollow inner cavity forms an annular engagement inner concave ring 21, and the outer wall of the lower needle seat 5 is formed into the annular ring.
- the annular ring 21 is engaged with the annular engagement ring 22.
- the annular elastic buffer gap 11 has a gap width of 0.3 mm to 6.8 mm, a depth of 1 mm to 8.6 mm, and an elastic sealing ring body 9 having a thickness ranging from 0.06 mm to 8 mm, and an elastic sealing ring.
- the thickness of the body 9 can vary depending on the size of the syringe, and the engagement strength can be adjusted accordingly.
- the outer spiral wall of the inner spiral sleeve 7 is uniformly distributed with a plurality of anti-side rotation ribs 23 at equal intervals, and the upper end portion of the anti-side rotation rib 23 is sharpened.
- An annular seal limit card slot 24 is formed on the inner wall of the cylinder neck of the cylinder 1 to cooperate with the annular elastic seal limiting portion 12.
- the inner wall of the cylinder neck of the upper portion of the annular seal limiting card slot 24 is distributed with the anti-side camber
- the rib 23 cooperates with the anti-side rib 25 of the side.
- the interchangeable needle elastic buffer has a split assembly structure or a single injection molding structure between the upper needle holder 4 and the lower needle holder 5.
- the outer diameter of the sealing rubber ring 16 is larger than the inner diameter of the cylinder neck of the cylinder 1 by 0.05 mm to 0.9 mm, which can achieve an optimal sealing effect between the two.
- the elastic buffering and engaging mechanism formed by the elastic sealing ring can be disposed at the upper and lower needles of the double needle seat, or at the inner wall of the cylinder, and the shape, size and thickness of the elastic body and The position can be changed according to the overall design of the product; however, in any way, it is only necessary to form corresponding elastic cavities and engaging mechanisms at the inner needle seat or the inner wall of the cylinder.
- the elastic sealing ring can be realized in various forms, not only a closed ring body, such as a ring body that is broken several places or a ring body composed of a plurality of elastic engaging portions, as long as it passes through the elastic part
- the structure of connecting the hub and the barrel by elastic snapping should be considered as belonging to the protection scope of the present invention.
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Abstract
一种回拉式可换针安全自毁注射器,包括筒体(1),筒体(1)内设有芯杆(2),芯杆(2)靠近上端部处套接有胶塞(3)。筒体(1)上端部的筒颈内设有位于上部的可换针弹性缓冲上针座(4)和位于下部的下针座(5),两者通过套接卡合方式连接成一体。该上针座(4)上部形成6:100锥度的针座套柱(6)。该注射器结构合理,操作简单,工作状态稳定,具有安全性和实用性的特点。
Description
本实用新型涉及医疗器械的技术领域,具体的说是一种回拉式可换针安全自毁注射器,特别涉及其机械连接结构。
对比文件,专利号:ZL201210049628.1,申请日:2012.02.29,申请人:王祖扬,本案公开了“一种针头回拉式安全自毁注射器”,包括筒体,所述筒体端部的筒颈内设有针座本体,筒体内设有芯杆,芯杆靠近端部处设有胶塞,其特征在于:所述针座本体上部置于筒颈内,针座本体中段形成弹性密封限位部,针座本体下部与外套式回拉锁定组件连接,弹性密封限位部表面开设有环状缓冲间隙,环状缓冲间隙外侧的弹性密封限位部外壁处形成环状密封限位卡合部,芯杆端部设有非对称弹性锁定回拉件。
现有安全注射器结构中有利用倒钩体实现针头回缩的功能,实现安全注射。一般倒钩体为金属件或塑料件。金属件需要加工并与芯杆配合或组装,制作工艺复杂,难度大且稳定性不佳,不但增加了加工工序和制造成本,而且金属件本身及其装配过程会增加产品在安全性及产品质量方面的隐患等不确定性。现有塑料倒钩件在结构上仍存在缺陷或有不完善的地方,因此导致产品在使用过程中存在安全隐患或安全漏洞。现有的塑料倒扣件设计,虽能实现针头回拉功能,但在使用中,针头被回拉后仍然处于正常轨迹,针头有可能被再次推出造成使用者被二次损伤的风险。
另外,传统的单针座回抽式安全自毁注射器或安全注射器均存在同一个难题,就是如何解决内针座与筒体之间卡合稳定并达到一定的强度以符合稳定性要求;同时,在回抽针座时所需拉力不能太大以方便使用。硬性配合结构虽然能达到内针座与筒体内壁稳定的锁定效果,但很难甚至是无法同时达到方便使用的需求。塑料材料本身存在的不稳定性和易受环境温度变化的特性会导致硬配合结构的产品稳定性极差,生产过程中质量和精度都难以控制,几乎无法实现批量生产。
再者,对比文件中改进款的注射器结构虽然基本能实现与筒体之间的稳定性要求,但内针座与注射器筒体之间需装配密封胶环才能实现密封功能,密封胶环设置的方式和位置直接影响注射器的密封效果和注射时的药液残留量,现有的内针座密封胶环装配后在运输和使用过程中会发生位移,而且药液残留量也不甚理想。
综上所述,仍然需要对现有回拉式注射器针座与筒体之间的锁定结构和密封胶环装
配结构进行进一步改进,以进一步完善产品在使用过程中的安全性和稳定性,降低药液残留量,同时达到简化加工工序,降低制造成本的目的。
发明内容
本实用新型的目的在于提供一种回拉式可换针安全自毁注射器,该注射器双针座可与注射器筒体之间通过弹性缓冲卡合机构相互锁定。巧妙运用卡合部位的缓冲间隙和卡合部件的可塑性,完美实现两者的锁定和脱离效果。该弹性缓冲卡合机构可设置于双针座的上下针座处,亦可设置于筒体内壁处,弹性缓冲体的形状、大小、厚度或位置可随产品整体设计而变换;但无论采用何种方式,只要同时在内针座或筒体内壁处形成相对应和相互配合的弹性缓冲卡合机构即可。与之配合的注射器芯杆端部设有带弹性功能的非对称锁定件,该锁定件可与注射器双针座的下针座内腔通过卡合方式相互锁定。当针座被回拉至注射器筒体内时在非对称弹性结构的力量作用下,针座会受力顺势向一侧偏转;注射针也因此会向近四十五角方向倒向筒体内壁一侧;当注射针完全退回筒体后,针头会被筒体颈部锁定,由此导致注射针及针座无法被再次推出筒体外,有效防止针头被再次推出造成的二次损伤,实现注射器的安全自毁操作,同时,上下针座之间形成密封胶环装配部,使得密封装配结构更加稳定,内陷式胶环装配结构可有效防止渗漏和进一步降低药液残留量,克服了现有技术中存在的缺点和不足。
为了实现上述目的,本实用新型的技术方案是:一种回拉式可换针安全自毁注射器,它包括筒体,筒体内设有芯杆,芯杆靠近上端部处套接有胶塞,筒体上端部的筒颈内设有位于上部的可换针弹性缓冲上针座和位于下部的下针座,两者通过套接卡合方式连接成一体,其特征在于:所述可换针弹性缓冲上针座上部形成6:100锥度的针座套柱,针座套柱外部形成内螺旋套筒,针座套柱位于内螺旋套筒的中心位,内螺旋套筒的内壁形成内螺纹,可换针弹性缓冲上针座的外壁处形成弹性密封限位环体,该弹性密封限位环体与内螺旋套筒呈反向分布,弹性密封限位环体的底部与内螺旋套筒的底部形成连接部,弹性密封限位环体内壁与可换针弹性缓冲上针座外壁之间形成环形弹性缓冲间隙,弹性密封限位环体的外壁处形成环状弹性密封限位部,环状弹性密封限位部表面呈弧形***状,所述下针座呈圆柱形,下针座下部靠近外边缘处形成限位插环,该限位插环与下针座外壁之间形成环状间隙,可换针弹性缓冲上针座下端位于环状间隙内,上述弹性密封限位环体的悬空端与限位插环上端之间形成环形的密封胶圈装配部,密封胶圈位于该环形的密封胶圈装配部内,下针座内腔中空,中空内腔的内壁处形成环状锁定环,该环状锁定环上表面形成环形锁槽,环状锁定环的下表面形成环形导向斜面,该形成环形导向斜面的斜面与水平面之间形成5度-85度的夹角,芯杆
上端部设有非对称回拉锁定件,该非对称回拉锁定件的最大宽度大于环状锁定环内径,,环状锁定环的内径为1mm-15mm,环状锁定环的内壁在环形锁槽的作用下具有弹性。
本实用新型公开了一款回拉式可换针安全自毁注射器,上针座和下针座之间为分体式装配结构或一次注塑成型,上下针座之间的外壁处形成密封胶环装配部,使得密封装配结构更加稳定,内陷式胶环装配结构可有效防止渗漏和进一步降低药液残留量,与针座配套使用的注射器芯杆的端部设有带弹性功能的非对称回拉锁定件;非对称性结构配合弹性功能设计,可确保该锁定件能顺利***弹性缓冲下针座内腔,并利用其弹性扩张的功能,实现倒钩部件与弹性缓冲下针座的卡合并锁定。由于环形锁槽设计也具有弹性缓冲特性,当与非对称回拉锁定件(倒钩部件)在推进状态触及时,两者都会产生相对的缓冲变形,便于非对称回拉锁定件(倒钩部件)卡入环状锁定环的锁槽内;在锁定件回抽时与环状锁定环的锁槽相互锁定。当针头部被回拉至注射器筒体内时,在非对称作用力的受力环境下,针头部整体会受力向一侧偏转,注射针会因此向近四十五角方向倒向筒体内壁一侧;当注射针完全退回筒体后,针头会被筒体颈部锁定,由此导致注射针及针座无法被再次推出筒体外,有效防止针头被再次推出造成二次损伤,真正实现注射器的安全自毁操作。在本发明具体实施时,所述的非对称弹性回拉锁定件为一塑料倒钩体。该塑料倒钩体采用非对称性和弹性体结构巧妙配合的设计原理,运用特定的角度和尺寸设计,使得倒钩本体具备弹性缓冲锁定功能。上述非对称弹性回拉锁定件与芯杆成一体结构,整体部件采用一次开模成型,无需单独加工或后续装配,有效降低了制造成本,简化了装配工艺,减少了装配工序。芯杆端部的非对称弹性回拉件与针座内腔的卡合锁定效果极佳,产品整体结构合理,构思巧妙,操作使用简单,工作状态稳定,易于推广应用。相比现有产品设计和技术而言,设计上具有显著的技术性突破,并具有突出的安全性和实用性特点。
图1为本实用新型结构示意图。
图2为本实用新型弹性缓冲上针座结构示意图。
图3为本实用新型下针座结构示意图。
图4为本实用新型上下针座装配图。
下面参照附图,对本实用新型进一步进行描述。
本实用新型为一款回拉式可换针安全自毁注射器,如图1中所示,它包括筒体1,筒体内设有芯杆2,芯杆靠近上端部处套接有胶塞3,筒体1上端部的筒颈内设有位于上部的
可换针弹性缓冲上针座4和位于下部的下针座5,两者通过套接卡合方式连接成一体,其区别于现有技术在于:所述可换针弹性缓冲上针座4上部形成6:100锥度的针座套柱6,针座套柱6外部形成内螺旋套筒7,针座套柱6位于内螺旋套筒7的中心位,内螺旋套筒7的内壁形成内螺纹8,可换针弹性缓冲上针座4的外壁处形成环状弹性密封限位筒9,该环状弹性密封限位筒9与内螺旋套筒7呈反向分布,环状弹性密封限位筒9的底部与内螺旋套筒7的底部形成连接部10,环状弹性密封限位筒9内壁与可换针弹性缓冲上针座4外壁之间形成环形弹性缓冲间隙11,环状弹性密封限位筒9的外壁处形成环状弹性密封限位部12,环状弹性密封限位部12表面呈弧形***状,所述下针座5呈圆柱形,下针座5下部靠近外边缘处形成限位插环13,该限位插环13与下针座5外壁之间形成环状间隙14,可换针弹性缓冲上针座4下端位于环状间隙14内,上述环状弹性密封限位筒9的悬空端与限位插环13上端之间形成环形的密封胶圈装配部15,密封胶圈16位于该环形的密封胶圈装配部15内,下针座5内腔中空,中空内腔的内壁处形成环状锁定环17,该环状锁定环17上表面形成环形锁槽18,环状锁定环17的下表面形成环形导向斜面19,该形成环形导向斜面19的斜面与水平面之间形成5度-85度的夹角,该环形导向斜面对芯杆端部的非对称回拉锁定件(倒钩部件)有导向作用,同时引导倒钩部件在滑入针座内腔时发生变形,同时,在针座被拉入筒体内腔时,会向一侧发生偏转,环形导向斜面18能留出偏转时所需空间,芯杆2上端部设有非对称回拉锁定件20,该非对称回拉锁定件20的最大宽度大于环状锁定环17内径,,环状锁定环17的内径为1mm-15mm,环状锁定环16的内壁在环形锁槽18的作用下具有弹性。
在具体实施时,所述非对称回拉锁定件20为塑料倒钩体或金属倒钩体,倒钩体可与环状锁定环17上表面的环形锁槽18配合,倒钩体的钩端锁于环形锁槽18内。所述环形锁槽18的截面近似呈三角形,便于倒钩体锁定。
在具体实施时,所述可换针弹性缓冲上针座4下部内腔中空,该中空内腔的内壁处形成环形卡合内凹环21,所述下针座5外壁形成与环形卡合内凹环21配合的环形卡合凸环22。
在具体实施时,所述环形弹性缓冲间隙11的间隙宽度为0.3mm-6.8mm,深度为1mm-8.6mm,弹性密封限位环体9的厚度范围为0.06mm-8mm,弹性密封限位环体9的厚度可根据注射器不同规格而各异,并以此调节卡合强度。
在具体实施时,所述内螺旋套筒7外壁处等间距均匀分布有若干防侧旋凸筋23,防侧旋凸筋23的上端部成尖刺状。所述筒体1的筒颈内壁处设有与环状弹性密封限位部12配合的环形密封限位卡槽24。所述环形密封限位卡槽24上部的筒颈内壁处分布有与防侧旋凸
筋23配合的防侧旋凹筋25。
在具体实施时,所述可换针弹性缓冲上针座4和下针座5之间呈分体式装配结构或一次注塑成型结构。
在具体实施时,所述密封胶圈16的外径大于筒体1的筒颈内径0.05mm-0.9mm,可实现两者之间的最佳密封效果。
在具体实施时,由弹性密封限位环体所构成的弹性缓冲卡合机构可设置于双针座的上下针座处,亦可设置于筒体内壁处,弹性体的形状、大小、厚度和位置可随产品的整体设计而变换;但无论采用何种方式,只要同时在内针座或筒体内壁处形成相对应和相互配合的弹性缓冲卡合机构即可。弹性密封限位环体可由多种形式实现,并非只能是一个封闭的环体,如断开几处的环体或者由多个弹性卡合部构成的环体,应当说只要是通过弹性部件通过弹性卡合方式连接针座和筒体的结构都应当视为属于本实用新型的保护范围。
以上内容是结合具体的优选实施方式对本实用新型所作的进一步详细说明,不能认定本实用新型具体实施只局限于上述这些说明。对于本实用新型所属技术领域的普通技术人员来说,在不脱离本实用新型构思的前提下,还可以做出若干简单推演或替换,都应当视为属于本实用新型的保护范围。
Claims (11)
- 回拉式可换针安全自毁注射器,它包括筒体(1),筒体内设有芯杆(2),芯杆靠近上端部处套接有胶塞(3),筒体(1)上端部的筒颈内设有位于上部的可换针弹性缓冲上针座(4)和位于下部的下针座(5),两者通过套接卡合方式连接成一体,其特征在于:所述可换针弹性缓冲上针座(4)上部形成6∶100锥度的针座套柱(6),针座套柱(6)外部形成内螺旋套筒(7),针座套柱(6)位于内螺旋套筒(7)的中心位,内螺旋套筒(7)的内壁形成内螺纹(8),可换针弹性缓冲上针座(4)的外壁处形成弹性密封限位环体(9),该弹性密封限位环体(9)与内螺旋套筒(7)呈反向分布,弹性密封限位环体(9)的底部与内螺旋套筒(7)的底部形成连接部(10),弹性密封限位环体(9)内壁与可换针弹性缓冲上针座(4)外壁之间形成环形弹性缓冲间隙(11),弹性密封限位环体(9)的外壁处形成环状弹性密封限位部(12),环状弹性密封限位部(12)表面呈弧形***状,所述下针座(5)呈圆柱形,下针座(5)下部靠近外边缘处形成限位插环(13),该限位插环(13)与下针座(5)外壁之间形成环状间隙(14),可换针弹性缓冲上针座(4)下端位于环状间隙(14)内,上述环状弹性密封限位筒(9)的悬空端与限位插环(13)上端之间形成环形的密封胶圈装配部(15),密封胶圈(16)位于该环形的密封胶圈装配部(15)内,下针座(5)内腔中空,中空内腔的内壁处形成环状锁定环(17),该环状锁定环(17)上表面形成环形锁槽(18),环状锁定环(17)的下表面形成环形导向斜面(19),该形成环形导向斜面(19)的斜面与水平面之间形成5度-85度的夹角,芯杆(2)上端部设有非对称回拉锁定件(20),该非对称回拉锁定件(20)的最大宽度大于环状锁定环(17)内径,环状锁定环(17)的内径为1mm-15mm,环状锁定环(16)的内壁在环形锁槽(18)的作用下具有弹性。
- 根据权利要求1所述的回拉式可换针安全自毁注射器,其特征在于:所述非对称回拉锁定件(20)为塑料倒钩体或金属倒钩体。
- 根据权利要求1所述的回拉式可换针安全自毁注射器,其特征在于:所述可换针弹性缓冲上针座(4)下部内腔中空,该中空内腔的内壁处形成环形卡合内凹环(21)。
- 根据权利要求1所述的回拉式可换针安全自毁注射器,其特征在于:所述下针座(5)外壁形成与环形卡合内凹环(21)配合的环形卡合凸环(22)。
- 根据权利要求1所述的回拉式可换针安全自毁注射器,其特征在于:所述环形锁槽(18)的截面近似呈三角形。
- 根据权利要求1所述的回拉式可换针安全自毁注射器,其特征在于:所述环形弹性缓冲间隙(11)的间隙宽度为0.3mm-6.8mm,深度为1mm-8.6mm,弹性密封限位环体(9)的厚度范围为0.06mm-8mm。
- 根据权利要求1所述的回拉式可换针安全自毁注射器,其特征在于:所述内螺旋套筒(7)外壁处等间距均匀分布有若干防侧旋凸筋(23),防侧旋凸筋(23)的上端部成尖刺状。
- 根据权利要求1所述的回拉式可换针安全自毁注射器,其特征在于:所述可换针弹性缓冲上针座(4)和下针座(5)之间呈分体式装配结构或一次注塑成型结构。
- 根据权利要求1所述的回拉式可换针安全自毁注射器,其特征在于:所述筒体(1)的筒颈内壁处设有与环状弹性密封限位部(12)配合的环形密封限位卡槽(24)。
- 根据权利要求1所述的回拉式可换针安全自毁注射器,其特征在于:所述密封胶圈(16)的外径大于筒体(1)的筒颈内径0.05mm-0.9mm。
- 根据权利要求9所述的回拉式可换针安全自毁注射器,其特征在于:所述环形密封限位卡槽(24)上部的筒颈内壁处分布有与防侧旋凸筋(23)配合的防侧旋凹筋(25)。
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EP1514566A1 (en) * | 2003-09-09 | 2005-03-16 | Ping-Te Huang | Syringe including a retaining element with an integral annular rib |
CN201744031U (zh) * | 2010-08-06 | 2011-02-16 | 上海康德莱企业发展集团有限公司 | 一次性使用回拉式注射器 |
CN102652849A (zh) * | 2011-03-02 | 2012-09-05 | 张淑茗 | 安全注射器的针座组件自转回缩结构 |
CN103285464A (zh) * | 2012-02-29 | 2013-09-11 | 王祖扬 | 一种针头回拉式可换针安全自毁注射器 |
CN202982798U (zh) * | 2012-11-08 | 2013-06-12 | 苏州市雅思精密模具有限公司 | 一种一次性注射器 |
CN203620014U (zh) * | 2013-10-18 | 2014-06-04 | 王祖扬 | 回拉式可换针安全自毁注射器 |
CN203620013U (zh) * | 2013-10-18 | 2014-06-04 | 王祖扬 | 一种用于回拉式可换针安全自毁注射器的内针座结构 |
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CN203620013U (zh) | 2014-06-04 |
CN203620014U (zh) | 2014-06-04 |
WO2015070522A1 (zh) | 2015-05-21 |
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