Needle protector device for syringe.

Abstract: A device for protecting the needle of a syringe to keep it sterile before use and to prevent it from accidental pricks after use consists of a rigid protection housing (6, 6A) connected by an elastic member (7) to the syringe cylinder (1) at the opposite end apart from the needle. Protection housing (6, 6A) enclosing the syringe is shorter than the latter. When the elastic member is in its rest position, needle (5) is completely enclosed in the protection housing; when the elastic member is manually contracted, protection housing slides along the syringe cylinder, thus allowing the needle to be extracted. Several embodiments of a safety lock means are provided to prevent the needle to be accidentally extracted from the protection housing.

Description: This invention relates to a device for protecting the needle of a syringe before and after the use thereof. Syringes left in the parks, meadows, beaches and other sites frequented also by children very often cause accidental pricks with feasible transmission of deseases. Reusing the same syringe by several people is particularly dangerous. This invention seeks to obviate such problems by providing a device which besides isolating the needle of a new syringe to keep it sterile protects automatically the needle after being used also in case the syringe is violently throuwn away in order to prevent accidental pricks with feasible infection. According to the invention the device can be rapidly released by operating a suitable safety lock, thus allowing the normal use of the syringe. The device according to the appended claim 1 consists of a protection housing which is pushed in the forward direction by a spring or other elastic member, thus protecting the needle under normal conditions, and can be easily and manually withdrawn upon use of the syringe. When the latter is then left or thrown away the elastic member pushes the housing to protect the needle. A safety lock means is provided to prevent the protection housing from sliding along the syringe when the latter is not used. This safety lock means can be such that reusing the syringe is very hard or impossible. The invention will be set forth in greater detail in the following description of some embodiments thereof with reference to the annexed drawing, in which: Fig. 1a and 2 are partially sectioned side views of a first embodiment of the protection device for a syringe under protection conditions and in a manually operated non-protected state, respectively; Fig. 1b is a back end view of the syringe without cap of Fig. 1; Fig. 3 shows a similar view as Figs. 1 and 2 of another embodiment of the syringe with a different safety lock means; Figs. 4, 5 and 6 show another embodiment of the protection device with different safety lock means in partially sectioned side views showing the syringe before, during and after its use, respectively. In the drawing the same numerals are used to indicate the same or similar parts in different embodiments. In particular, the cylinder of the syringe is designated by 1, the outer end of the plunger rod by 2, the protection cap by 3 and the support of joint member of the needle by 5. A rigid housing to protect the needle is designated by 6. Such housing is normally pushed in the forward direction by an elastic member 7 in order to protect needle 5. According to a first embodiment (in particular, Figs. 1a, 1b) elastic member 7 has generally the form of a ring and provides two coaxially bored and diametrally opposed expansions 7a, 7b one of which is integral with end 9 of the sliding housing, the other is integral with nut 8 at the end of cylinder 1 opposed to the needle. Elastic member 7 can be of plastic as protection housing 6 but could be replaced by a spring or any other shaped elastic member. It should perform its elastic action in the longitudinal direction of the syringe. By 10 (Fig. 1a, 1b and 2) a safety lock means is shown which is formed of an elastic blade which under rest condition takes the position of Fig. 1, thus preventing protection housing 6 to slide back. By pushing blade 10 against cylinder 1, protection housing 6 can slide back, thus overcoming the force of elastic member 7 so that needle 5 is free from protection housing. Thus, blade 10 is inserted into the gap between cylinder 1 and housing 6 or into an eventual slot provided within the housing itself. In order to allow plunger 2 of the syringe to be operated and at the same time protection housing 6 to be kept in retracted position the housing is provided with slots 11 allowing cylinder 1 to be caught by the fingers. Thus, it is possible to use the syringe with only one hand. After use, when the syringe is left or thrown away, elastic member 7 automatically pushes forward housing 6, resilient blade 10 is released and prevent the syringe from being used again. Therefore needle 5 is completely protected by the housing, thus preventing accidental pricks. In the embodiment of Fig. 3 the safety lock means is formed of a tongue 12 eventually cut from the protection housing and elastically bent upwards, thus abuting against the forward end of cylinder 1 and preventing the protection housing to slide back. By extracting tongue 12 through its grip member 12a and by withdrawing housing 6 through elastic member 7, the syringe can be normally used. In order to make the grip on cylinder 1 easier the outer surface thereof can be provided with a rough area designated by 14 in the figures. With reference to Figs. 4 and 6 there is shown another embodiment of the invention providing as safety lock means against the accidental extraction of the needle a pair of tongues 15, 15 cut into the rigid housing in opposite positions and slightly sloping inwards. The tongues have their free ends close to the joint 4 of cylinder 1 and against the outer surface of a hollow plug 13A (Fig. 4). The needle can be kept in sterile condition. The outer diameter of plug 13A is generally the same as the outer diameter of cylinder 1. Therefore, needle 5 is extracted by pressing elastic member 7 and causing the free ends of tongues 15, 15 to slide from their rest position around plug 13A to the position around cylinder 1. The plug can be then extracted (Fig. 5) and the syringe can be normally used by holding elastic member 7 pressed in the hand. After use the elastic member is released so that housing 6 protects the needle again. Tongues 15, 15 are resiliently bent inwards, thus preventing the needle to be extracted. The syringe cannot be used anymore unless plug 13A is inserted again to spread tongues apart. The described device with its embodiments can be applied to ordinary syringes or integrated into suitable syringes. Elastic member or spring can be adjustable. The construction could be different from that shown as an example without departing from the scope of the present invention.

Claims: 1. Device for protecting the needle of a syringe before and after the use thereof, characterized by: - a protection housing coaxial with the syringe and comprising a rigid tubular portion provided with cap (13, 13A) which encloses needle (5), joint portion (4) of the needle and a portion of syringe cylinder (1), and can slide along the syringe, thus allowing the needle to be completely extracted, said rigid tubular portion being provided with two opposite slots (11) allowing cylinder (1) of the syringe to be suitably handled; - an elastic means connecting the protection housing at its end (9) opposed to the needle with cylinder (1) at the free end of plunger rod (2) of the syringe, said elastic means being able to perform its elastic action in the longitudinal direction of the syringe axis in order to cause protection housing to slide along the syringe; and - a safety lock means adapted to prevent the elastic means to be accidentally operated and the needle to be unintentionally extracted. 2. The device of claim 1, characterized in that said protection housing (6) is cylindrical and has an inside diameter somewhat larger than that of both the joint portion of the needle and the syringe cylinder. 3. The device of claim 1, characterized in that said protection housing (6A) is a cylinder having constant diameter. 4. The device of claim 1, characterized in that said elastic means consists of an elastic ring (7) of plastic material provided with two coaxially bored diametrally opposed expansions (7a, 7b), each of them has a hole with a larger diameter than the syringe cylinder, one of said expansion being integral with end (9) of the protection housing opposed to the needle, the other expansion being integral with nut (8) connected to syringe cylinder (1) at the end of plunger rod (2). 5. The device of claims 1, 2 and 4, characterized in that the safety lock means is a moving projection (10) generally parallel to the syringe cylinder and opposing the contraction of said elastic ring (7). 6. The device of claims 1, 2 and 4, characterized in that the safety lock means is a resilient tongue (12) sloped to the interior of the protection housing and abuting against the forward end of the syringe cylinder, said tongue being also provided with a grip member (12a) projecting outwards through an opening of the protection housing, the operation of which allows the protection housing to slide along the syringe cylinder. 7. The device of claims 1, 3 and 4, characterized in that said protection housing is cut to form two tongues (15, 15) diametrally opposed to each other and resiliently bent to the interior of the protection housing and against a removable hollow plug (13A) surrounding joint portion (4) of the needle and needle (5) itself, said plug (13A) being removed in order to allow tongues (15, 15) to engage the end of the syringe cylinder, thus preventing the needle to be extracted after the use of the syringe. 8. A device according to any of the preceeding claims, wherein the outer surface of cylinder (1) is rough at the grip portion (14) thereof.

Inventors: TAMBURINI, CARLO
Applicants: TAMBURINI, CARLO
Application year: 1988
Main classification: A61M5
IPC codes: A61M5