OA18621A - Retractable syringe. - Google Patents

Retractable syringe. Download PDF

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Publication number
OA18621A
OA18621A OA1201800190 OA18621A OA 18621 A OA18621 A OA 18621A OA 1201800190 OA1201800190 OA 1201800190 OA 18621 A OA18621 A OA 18621A
Authority
OA
OAPI
Prior art keywords
needle hub
syringe
hub
plunger
barrel
Prior art date
Application number
OA1201800190
Inventor
Allan Walsh
Hyland Franke
Original Assignee
Global Medisafe Holdings Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Global Medisafe Holdings Ltd filed Critical Global Medisafe Holdings Ltd
Publication of OA18621A publication Critical patent/OA18621A/en

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Abstract

An auto-retractable syringe having a barrel and a plunger wherein engagement of said plunger with an otherwise immobilised needle hub allows a biasing member to push the needle hub into a cavity in the plunger.

Description

[0001] The invention relates to the field of hypodermic syringe manufacture. In particular, the invention relates to a rétractable safety syringe, in which the needle is capable of being withdrawn into the barrel ofthe syringe after use via a spring or similar mechanism.
Background ofthe Invention [0002] Safety syringes for hypodermic needles are becoming a very important tool of healthcare. The ability to prevent needle-stick injuries is extremely important In preventing the spread of blood-borne diseases.
[0003] One particuiar type of safety syringe is the rétractable syringe. That is: a syringe wherein there is provided a mechanism, usually a spring, inside the syringe that is activated upon completion ofthe Injection ofthe fluid, whereby the spring acts to retract the needle inside the syringe barrel. This prevents the needle from causing a needle-stick injury, and in particular it allows the needle operator to withdraw the needle via a onehanded operation, which makes it much easier to achleve In the situation of providing Injections to patients in a busy hospital or clinic.
[0004] One type of rétractable syringe is that disclosed in WO 2006/096901, wherein there Is provided a syringe with a hollow plunger that can accommodate a withdrawn needle and needle hub, the hub and needle being actuated by the expansion of a spring into the plunger, and where the spring is released by pressure of the plunger on the assembly that holds the hub in place by restraining the spring from release.
[0005] Such syringes are referred to commonly as 'auto-retractabie', meaning that the actuation of the needle retraction Is provided by a mechanism In the syringe itself, as opposed to requiring the operator to pull, push or otherwise move the needle into the barrel of the syringe.
[0006] A drawback with this type of rétractable syringe is that they are prone to liquid leakage, and the mechanism tends to suffer from functional reliability issues.
[0007] Other designs are relatively complex and so are difficuît or expenslve to manufacture. Yet other designs do not allow for full dispensing of the injectable fluid, due to dead-zones being left in the barrel.
[0008] Accordingly, it is an object of the invention to provide a rétractable syringe construction that améliorâtes at least some ofthe problems associated with the priorart.
Summary of the Invention [0009] According to a first aspect of the invention, there is provided an autoretractable syringe having a barrel and a plunger moveable within said barrel, said barrel having a gland assembly inside a forepart thereof, said gland assembly housing removable a needle hub to which Is attached a hypodermic needle; wherein a biasing member is disposed between the gland assembly and said needle hub so as to tend to urge the needle hub into said barrel; wherein said plunger has an internai cavity capable of receiving the needle hub; wherein the needle hub is kept in place prior to use by a detent arrangement that prevents movement of the hub both into and out of the barrel; wherein engagement of said plunger with said needle hub forces the detent arrangement to release, allowing the biasing member to push the needle hub into said cavity in the plunger.
[0010] This type of syringe représente an improvement over the prior art in that leakage of fluid is reduced or elimînated, and also the syringe is of simpler, and therefore of more economical constructions. The instantaneous rétraction of the needle inslde the barrel via the biasing member (e.g. a spring) means the syringe can be used and disabled in one action, and with a one-handed operation.
[0011] Preferably, the detent arrangement comprises one or more indent régions in the needle hub, said indent région or régions having a profile that, when engaged would prevent movement of said hub, whether into or out of the barrel; and a set of résilient claws (e.g. three claws) that hâve a complementary profile to that of the indent or indents, that occupies the indent régions, thereby to lock the needle hub in place and defeating the force of the biasing member. More preferably, the internai profile of said Indent is square or rectangular. The detent arrangement that holds the needle hub more firmly in place, by disallowing movement in both directions, provides a particular advantage.
[0012] In a preferred embodiment, the upper région of said claws hâve an inclined surface that is inclined away from the needle hub, such that when engaged by a member moving In the direction of injection, the force applied thereby will tend to push the claws away from the needle hub, thereby releasing it and allowing the biasing member to push the hub into the plunger. Such upper surfaces allow for a more reliable engagement of the claws, and allow simple engagement by another moving part to create a controlled disengagement of the claws.
[0013] Preferably, the plunger has at its liquid-engaging end a stopper, said stopper being held In place by a detent arrangement that may be overcome by the force of the biasing member pushing the needle hub into the plunger. This allows the plunger to be pushed back into the cavity along with the needle. It also makes the syringe easier to manufacture and allows a more efficiently shaped plunger stopper to be employed, such as one with a partly-spherical liquid-engaging surface.
[0014] In a preferred embodiment, the biasing member is a spring, and said spring is installed partly compressed. Partial compression of the spring (as opposed to full compression) allows for simpler construction and better control of the rétraction operation.
[0015] Now will be described, by way of a spécifie, non-limiting example, a preferred embodiment of the Invention with reference to the drawings.
Brlef Description of the Drawings [0016] Figure 1 is a cross-sectional view of the 'needle' end of a syringe according to the invention.
[0017] Figure 2 is a cross-sectional view of a syringe according to the Invention, shown prior to completion of dispensing.
[0018] Figure 3 is a cross-sectional view of the syringe of figure 4, shown at the point of completion of dispensing.
[0019] Figure 4 is a cross-sectional view of the syringe of figure 4, shown following retraction of the needle hub.
Detailed Description of the invention [0020] The invention may be embodied by the arrangement of working parts at the 'dispensing' end of a rétractable hypodermic syringe. These are best understood by reference to the accompanying figures.
[0021] Turning to figure 1, there is shown an auto-retractable syringe 5. The major components of the syringe are the barrel 10, the plunger 15, the gland 20 and the needle
25. The gland 20 is inserted in the barrel 10 in a press-fit manner and houses the needle hub assembly. It is also possible for the gland to be a screw-in type.
[0022] The needle hub assembly includes the needle hub 30, in which is inserted the needle 25. A sliding activator sleeve 35 is fitted around the needle hub and in between these two parts is placed a partially compressed spring 40. The spring 40 is in contact with a stepped rear-facing surface45ofthe hub and an innerforward stepped surface 50 of the sleeve 35. Thus the spring’s rôle Is to tend to force the hub 30 rearward relative to the sleeve 35.
[0023] However, prior to dispensing, this tendency of the spring 40 is held in check by a detent mechanism. This mechanlsm consists of three résilient claws 55 that protrude from the inner front surface 60 of the gland 20. Each of said claws have a square or rectangular lug 65 oriented toward the needle hub 25. They also have an rearward 'head' surface 85 that is smooth but sloped in a sense that It is furthest from the surface of the hub 30 at its upper-most extremity, and said surface is doser to the hub 30 or the gland 20 at the ’dispending end’ of the claw 55.
[0024] The activator sleeve 35 is chamfered around its forward edge to produce an angled surface 90. In assembly, this chamfered surface 90 is located as close as possible to the complementarily sloped 'head' surface 85 of the three claws 55. The closeness of the location means a more rapid response to dispensing pressure on the activation sleeve 35, as there is less distance to travel.
[0025] The needle hub 25 has a complementary groove 70 around its circumference that is located such that the lugs 65 are received within said groove 70 in pre-dispensing configuration. The positioning and shape ofthe lugs 65 and the groove 70 provide a very reliably immobile positioning of the needle hub, as the square shape of the lugs/groove combination prevents movement of the hub 30 in either a forward or rearward direction.
[0026] An O-ring 75 is located around the outer circumference of the activator sleeve 35 and positioned in an internai groove 80 in the inner surface of the gland 20. This provides a more effective seal around the hub/sleeve assembly to prevent fluid leakage during dispensing.
[0027] The plunger 15 is formed as a hollow barrel, with an internai cavity 100. The end of said plunger barrel is sealed via a stopper 105 made of rubber and which is held in place by a simple detent ring 110. On the outside of the plunger barrel is arranged a rubber gasket 115, which makes a sealing engagement with the Inner surface of the barrel 10. The forward surface 120 of the stopper Is partly spherical and the rear surface 125 of the needle hub 30 are shaped In a complementary manner to afford maximum dispensing and minimal ’dead zones'.
[0028] Turning to figure 2, there Is shown a syringe 200 according to the invention during the fluid dispensing phase, where the fluid is in the cavity 205 formed between the plunger 215 and the rear of the needle hub 225, The remainder of the parts are as described In figure 1. In addition, it will be noted that there are provided 'air escape' holes 210 In the plunger barrel 215, which are required to allow air to escape as the hub Is (later) pushed in to the cavity 205.
[0029] Turning to figure 3, there is shown the syringe of figure 2 at the point of full dispensing, just as pressure is brought to bear on the rear end 300 of the activation sleeve 335 by the plunger 315. As the activation sleeve 335 Is pushed forward, the chamfered forward surface 390 can be seen making contact with the angled 'head' surface 385 of the claws 355 and beginning to force the claws away from the hub 330, thereby causing the lugs 365 to begin to disengage with the groove 380, thereby to release the spring 340.
[0030] Turning to figure 4, there is shown the syringe of figure 3 post the release of the detent mechanism. The spring 440 has extended and thereby pushed the needle hub 430 and the stopper 505 well inside the plunger's internai cavity 500. The needle 425 can be seen to be also well inside the body of the syringe 405. At his point the syringe can be safely disposed of without risk of needle-stick Injury.
[0031] It will be appreciated by those skilled In the art that the above described embodiment Is merely one example of how the Inventive concept can be implemented. It will be understood that other embodiments may be conceived that, while differing in their detail, nevertheless fall within the same inventive concept and represent the same invention.

Claims (7)

  1. Claims
    1. An auto-retractable syringe having a barrel and a plunger moveable within said barrel, said barrel having a gland assembly inside a forepart thereof, said gland assembly housing removable a needle hub to which is attached a hypodermic needle; wherein a biasing member is disposed between the gland assembly and said needle hub so as to tend to urge the needie hub into said barrel; wherein said plunger has an Internai cavity capable of receiving the needle hub; wherein the needle hub is kept in place prior to use by a detent arrangement that prevents movement of the hub both into and out ofthe barrel; wherein engagementofsaid plungerwith said needle hub forces the detent arrangement to release, allowing the biasing member to push the needle hub into said cavity In the plunger.
  2. 2. The syringe of claim 1, wherein the detent arrangement comprises one or more indent régions in the needle hub, said indent région or régions having a profile that, when engaged would prevent movement of said hub, whether into or out of the barrel; and a set of résilient claws that hâve a complementary profile to that ofthe indent or indents, that occupies the indent régions, thereby to lock the needle hub in place and defeating the force of the biasing member.
  3. 3. The syringe of claim 2, wherein the internai profile of said indent is square or rectangular.
  4. 4. The syringe of claim 3, wherein the upper région of said claws hâve an inclined surface that is Inclined away from the needle hub, such that when engaged by a member moving in the direction of injection, the force applied thereby will tend to push the claws away from the needle hub, thereby releasing it and ailowing the biasing member to push the hub into the plunger.
  5. 5. The syringe of any preceding claim, wherein the plunger has at its liquidengaging end a stopper, said stopper being held In place by a detent arrangement that may be overcome by the force ofthe biasing member pushing the needle hub intothe plunger.
  6. 6. The syringe of claim 5, wherein the stopper has a partly-spherical liquidengaging surface.
  7. 7. The syringe of any preceding claim, wherein the biasing member is a spring, and said spring is installée! partly compressed.
OA1201800190 2015-11-10 2016-11-18 Retractable syringe. OA18621A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201510761492 2015-11-10
CN201520893201 2015-11-10

Publications (1)

Publication Number Publication Date
OA18621A true OA18621A (en) 2018-12-28

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