Safety syringe

FIELD: medicinal equipment, in particular, safety syringes.

SUBSTANCE: safety syringe has cylinder with axial through opening, retainer provided within front end of cylinder, piston, needle hub, and needle. Piston positioned for sliding inside cylinder is equipped with sealing rubber member, head and flange disposed on piston in opposed relation to head. Needle hub is detachably engaged with cylinder and is provided with axial opening corresponding to that of cylinder and communicated therewith, and feeding opening adapted for communication with axial openings of needle hub and cylinder and for providing insertion of piston head. Needle has sleeve engaged with front head part of needle hub, and metal pipe engaged with sleeve. Piston has neck portion defined at its front end and arranged so that rubber sealing member tightly adheres thereto, and spatially inclined teeth. Head is made conical. Needle hub has conical front end with protrusions mating with cylinder retaining device upon rotation of cylinder. Slots are provided for engagement with inclined teeth. Bead provided in peripheral portion of feeding opening is mating with piston conical head. Protrusions are released from finger clamps upon rotation, when inclined teeth are engaged with slots.

EFFECT: simplified construction and convenient use.

4 cl, 12 dwg

 

Presentstudy level of technology

1. The technical field to which the present invention

The present invention relates to a syringe, and more particularly to a safe syringe, which has a ratchet type device formed on the needle hub, and an annular inclined teeth formed on one end of the piston, so that when pushing the hollow cylinder to the hub of the needle engagement between the ratchet device and the inclined teeth can provide the possibility of assignment of the hub of the needle with the needle into the cylinder when you pull the plunger back to prevent ukalyvaniya people with a used needle.

2. Description of the prior art,

Plastic cap is always worn on the hollow cylinder of the syringe to zacherley needle to prevent people from ukalyvaniya a used needle. However, because the user must hold standard cap when he or she puts a cap on the hollow cylinder, the user simply stuck with a needle. In addition, to prevent the spread of the disease used needles must be destroyed by melting or burning. However, when the melting or burning of the needle with a plastic cap will form a dangerous gas.

In another standard embodiment, the protective device is formed with a syringe to prevent use of the of the motor from ukalyvaniya. On the hub of the needle and the plunger of the syringe is formed clamps. With the full push of the piston in the hollow cylinder of the syringe clamps are coupled with each other. When you pull the plunger back hub with the needle is released from the cylinder and completely drawn into the cylinder. Used the needle will be fully shrouded hollow cylinder and held in the hollow cylinder to prevent anyone from touching or ukalyvaniya needle.

However, for education clamps requires a special mold. Production costs syringe with a standard protective device are large. In addition, since the entire syringe, containing a hollow cylinder, the piston and the hub must be melted or burned with a needle, even formed a dangerous gas.

Known safe syringe includes a nozzle for the injection, the needle cannula mounted on the base surface of the needle, and bearing surface for the needle may be attached to the connector support surface. The inner side of the rear end of the connector has the stoppers, which correspond to the protrusions on the connecting section of the plunger. The plunger has a shaft connected by a conical section with a connecting section having a rubber gasket. Safe syringe has a cylinder for accommodating section of the nozzle for injection and plunger so formed is impervious to idcustomer to hold medication or blood. Nozzle for injection attached to the cylinder through the locking of the annular ribs and grooves and remains attached during removal of the liquid phase injection. After the injection, the user simply rotates the rod of the plunger, captures the stoppers connector recesses in the plunger and engages the nozzle for injection into the cylinder of the syringe (see U.S. patent No. 5968019).

To reduce the cost of production there is a need in development for introduction in the production of an improved syringe, providing retraction of the used needle into the cylinder. Below with reference to figure 1 describes the standard safe syringe, which contains a hollow cylinder 10, a piston 20, a hub 30 of the needle and the needle 40.

The hub 30 of the needle limits the receiving hole 301 formed in the rear end of the hub 30 of the needle, and the flange 302 is formed in the receiving hole 301. The piston 20 has a conical head 201 formed on the front end of the piston 20, the corresponding receiving hole 301. In such a device when movement of the piston 20 within the cylinder 10 in the direction of the hub 30 of the needle and, ultimately, when bonded to the hub 30 of the needle bevel head 201 will have an interference fit within the receiving hole 301. Due to the formation of the flange 302 of the conical head 201 is fixed inside the receiving hole 301 after a full push to concubinage cylinder 10, so when you pull the piston 20 back into the cylinder 10, the hub 30 of the needle is capable of being drawn into the cylinder 10 together with the needle 40, as shown in figure 2.

However, to facilitate pushing of the hub 30 of the needle into the cylinder 10, the coupling between the hub 30 of the needle cylinder 10 must be reduced, otherwise the friction between the hub 30 of the needle and the inner periphery of the cylinder 10 will exceed the strength of the connection of the piston 20 to the hub 30 of the needle and the hub 30 of the needle will not be successfully allocated in the cylinder 10. Meanwhile, if the coupling between the hub 30 of the needle and the cylinder 10 is weakened, then the solution inside the cylinder will have a leak, and the injection will not be successful. In addition, with the introduction of the needle 40 into the tank 50 through the tube 51, the hub 30 of the needle can be moved in the opposite direction in the cylinder 10. When the movement of the hub 30 of the needle forward clutch between the conical head 201 and the flange 302 may not be durable. When the movement of the hub 30 of the needle back into the cylinder 10 premature adhesion between the flange 302 and tapered head 201 causes an increase in the residual fluid in the cylinder 10.

However, if the coupling between the hub 30 of the needle cylinder 10 increases, the force required for discharge of the hub 30 of the needle with the needle 40 back into the cylinder 10 also increases, which forces users to make will complement the aspects of the force.

As follows from figure 5, one way or another, the reduction of diameter of the inlet opening 301 or increase the diameter of the conical head 201 to increase friction between the hub 30 of the needle and the cylinder 10 will inevitably increase the difficulty of introducing a conical head 201 in the receiving hole 301, and the last thing I would like the user.

Another disadvantage of such a standard syringe is that when using the syringe by the user, the user typically will push out the air inside the cylinder 10, the cylinder, which often leads to coupling between the conical head 201 and the flange 302 and, therefore, the user will have to throw away unused syringe due to premature clutch conical head 201 with the flange 302.

An additional shortcoming of the standard syringe, is that for the needle 40 is not provided with a positioning device for discharge it back into the cylinder 10 so that the needle 40 can move in the transverse direction. Therefore, when pushing the piston forward in the cylinder 10, if the angle of the needle 40 is not sufficient, the needle 40 may exit the cylinder 10 from the outlet (not specified reference number and not shown) of the cylinder 10. In addition, if the cylinder 10 is turned to the ground, the needle 40 under the action of gravity may also withdraw from the of alindra 10 and accidentally prick user.

To eliminate the above disadvantages the present invention provides secure the syringe to reduce or exclude the above mentioned problems.

A SUMMARY of the PRESENT INVENTION

The main task of the present invention to provide a syringe, giving the ability to release the restriction of the cylinder relative to the needle hub so that the hub of the needle was capable of simply be drained back into the cylinder.

Another objective of the present invention to provide a syringe which is capable of sealing solution inside the cylinder due to the coupling between the hub of the needle cylinder so that there was no leakage, even when the needle hub is in the grip cylinder slidable.

Another object of the present invention to provide an improved syringe with a ratchet device formed on one end of the hub of the needle, and the inclined teeth formed on one end of the piston, corresponding ratcheting device hub of the needle, so that the adhesion between the ratchet device and the inclined teeth will facilitate moving the needle hub with the needle back into the cylinder.

An additional object of the present invention is to provide a safe syringe, the needle hub which has konice the cue front end, many of the projections formed on the periphery of the front end corresponding to the grooves of the cylinder hole, limited in the axial direction of the receiving hole, limited to messages with a hole, a lot of grooves that are limited in the periphery of the inlet opening for compliance with inclined teeth and bite, limited in the periphery of the inlet opening and above the slots for compliance with conical cylinder head. In this device, the hub of the needle securely engages with the cylinder after the push to the end of the cylinder and is in connection with the hub of the needle, so that the drug is not spent in vain.

Another objective of the present invention is to provide a safe syringe having a conical head and a flange corresponding to the conical head. Thus, even if the health care worker with secondary education, pushes the piston to the clutch piston with the needle hub, while the health care worker will not turn the piston, he may still draw the plunger back for attachment to the hub of the needle, because the activation ratcheting device, a health care worker needs to turn the piston.

Other objectives, advantages and new elements of the present invention will become more apparent from the following detailed description, made with reference to coprological the e drawings.

SHORT DESCRIPTION CERATIA

Figure 1 - section of a standard syringe.

Figure 2 - section of the syringe illustrated in figure 1, in which the hub of the needle is retracted into the cylinder.

Figure 3 - schematic view showing that the needle hub with the needle discharged back into the cylinder due to the free connection between the needle hub and the cylinder.

Figure 4 and figure 5 - sections illustrating the configuration of the conical head or inlet opening of a change to increase the strength of the connection of the cylinder to the hub of the needle.

6 is an isometric image of the syringe corresponding to the present invention, with a spatial separation of the parts.

Fig.7 is an enlarged isometric image, made with partial cutout, a front end of the cylinder corresponding to the present invention.

Fig enlarged isometric image, made with partial cutaway, of the hub of the needle corresponding to the present invention.

Figure 9 and figure 10 - cross-sections illustrating the movement of the piston within the cylinder for connection with the hub of the needle.

11 is a section view illustrating the rotation of the piston to provide a connection with the hub of the needle.

Fig - sectional view illustrating the hub of the needle with the needle retracted into the cylinder.

A DETAILED DESCRIPTION of the PREFERRED OPTION IMPLEMENTATION NASTOJASIH THE INVENTIONS

Figure 6 illustrates the syringe that matches the present invention, which has a cylinder 1, a piston 2, the hub 3 of the needle and the needle 4.

As shown in Fig.6 and Fig.7, the cylinder 1 restricts the axial direction of the through hole 11 and has a holding device 110 formed on the front end of the cylinder. The retaining device has many fingers 111, equally spaced from each other formed on the inner periphery bounding the through hole 11, and the slots 112, each of which is limited between two adjacent fingers 111. Each of the fingers has an L-shaped configuration, therefore, each of the grooves 112 also has an L-shaped configuration. The end of the through hole 11 has a constriction 13 its inner periphery for simple constraints of the piston 2 from the exit of the cylinder 1 when the abstraction of the piston 2 of the cylinder 1.

As is evident from Fig.6, the piston 2 has a neck 21 formed at its front end to allow the rubber seal 22 fit snugly therein, the conical head 23, protruding from the neck 21, the multiple spatial formed of inclined teeth 24, the elastic pusher 25 formed on the end of the conical head 23, and a flange 26 formed on the piston 2 on its end opposite the end on which is formed an elastic pusher 25.

As is evident from Fig.6 and Fig, the hub 3 ilikeit conical front end 31, many of the projections 32 formed on the periphery of the front end 31 corresponding to the recesses 112 of the cylinder 1, the hole 33, which is limited in the axial direction, the receiving hole 34, limited to messages with a hole 33, many of the slots 35, limited to the periphery of the inlet opening 34 corresponding to the inclined teeth 24, and the flange 36, bounded at the periphery of the inlet opening 34 and above the slots 35 for compliance with the conical head 23 of the piston 2. The hub 3 of the needle is the connecting piece designed to hold the needle 4 on the front end 31 of the hub. A sealing ring 37 mounted on the hub 3 of the needle to prevent leakage of the medicinal solution from the cylinder 1.

The needle 1 has a sleeve 41 and a metal tube 42.

During Assembly of the syringe corresponding to the present invention, the hub 3 of the needle is inserted into the sleeve 41 of the needle in the fitted tightly with needle 4. After that, the hub 3 of the needle with the needle 4 is inserted into the cylinder 1 to enable each of the tabs 32 to be mounted in a corresponding one of the recesses 112 and be clamped by means of L-shaped fingers 111. This effect rotation of the hub 3 and the needle 4 to be performed so that the tabs 32 can be installed in the recesses 112. In this device, the hub 3 of the needle with the needle 4 can have a reliable connection is compared with the cylinder 1. Avoid the concern that the hub 3 of the needle and the needle 4 can be protolknuli inside of the cylinder 1, while the needle is inserted into the tube 51, as shown in figure 3. When using the syringe, the corresponding present invention, the user inserts the piston 2 in the cylinder 1. Due to the presence of rubber seals 22 are securely installed in the neck 21 of the piston 2, the drug solution inside the cylinder 1, can be fully injection of the cylinder 1.

As follows from figure 9, after the solution injection of the cylinder 1, the user continuously pushes the piston 2, to force the conical head 23 and the plunger 25 to enter into the receiving hole 34 and, thus, allows the elastic pusher 25 to rely on the inner periphery of the hole 33. When the conical head 23 of the piston 2 is held in the receiving hole 34, the inclined teeth 24 are installed in the slots 35 and the joint between the neck 21 and the conical head 23 engages with the flange 36, as shown in figure 10.

After that, as shown in figure 11, the user rotates the piston 2, to allow engagement between the sloping teeth 24 and the slots 35 for simultaneous rotation of the hub 3 of the needle to release the restrictions of L-shaped fingers 111 of the projections 32. After restriction (clutch) fingers 111 of the projections 32 OS is bogdano, grip the conical head 23 with the shoulder 36 allows the user to take the hub 3 of the needle with the needle 4 back into the cylinder 1.

As follows from Fig when the hub 3 of the needle with the needle 4 is retracted into the cylinder 1, the elastic plunger 25 will exert pressure on the hub 3 of the needle with the needle 4 to bias together the hub 3 of the needle with the needle 4 to the through hole 11 of the cylinder 1, so that reuse of the syringe is not possible.

If the health care worker with secondary education, by mistake will push the piston 2 to the clutch conical head 23 with the shoulder 36 of the hub 3 of the needle, while the health care worker will not turn the piston 2, he may still draw the plunger 2 for attachment to the hub 3 of the needle, because the activation ratcheting device requires that the health care worker turned the piston 2.

Another option may not be a variant of the present invention, such as many equally spaced apart fingers 111 formed on the inner periphery bounding the through hole 11 can be formed as a ring and is installed in a through hole 11.

Although we have described above numerous characteristics and advantages of the present invention, together with elements of the design and function of the present invention, this description is illustrative only, and is without deviation from the principles of the present invention can be made by modifying parts, especially in the shape, size and arrangement of parts, which is limited only by the attached claims.

1. Safe syringe containing cylinder having a through hole made therein in the axial direction, and the retaining device is formed inside the front end of the cylinder; a piston mounted slidable in the cylinder and having a rubber seal, a head and a flange formed on the piston opposite the head; the hub of the needle, coupled with the possibility of disengagement with the cylinder and having a slot in the axial direction corresponding to the through hole in the cylinder and communicates with him, a receiving slot for the message with the specified hole and a through hole of the cylinder and to allow entry of the piston head; and a needle having a hub, coupled with the front head part of the hub of the needle, and a metal tube, coupled with the sleeve, wherein the piston has a neck formed at its front end with the possibility of providing adhesion to a rubber seal, and spatial educated inclined teeth, and the head is made conical, with the hub of the needle has a tapered front end with projections corresponding with the rotation restraint of the cylinder, the grooves in the designs for the installation of inclined teeth, and a flange formed in the periphery of the inlet opening to match the taper of the piston crown, and lugs made with the possibility of release upon rotation of the clamping fingers upon engagement of inclined teeth with grooves.

2. The syringe according to claim 1, characterized in that the holding device has an L-shaped fingers formed for clamping protrusions and depressions are made to install the tabs.

3. The syringe according to claim 2, characterized in that at the end of the conical head formed of an elastic pusher to install in the internal periphery of the receiving hole of the hub of the needle and the force acting in the transverse direction to the inner periphery of the receiving hole of the hub of the needle.

4. The syringe according to claim 2, characterized in that the fingers are formed in the form of a ring mounted in the through hole.



 

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