Self-priming vial for subcutaneous injection and suction piston

 

(57) Abstract:

Describes self-priming vial for subcutaneous injection 1, which contains the injected fluid and which includes in General a cylinder 3 having a wall, and the piston 44, capable of reciprocating motion in the specified cylinder 3 to create a vacuum in the ampoule 1 and to displace the specified injected fluid from it, with the specified piston 44 includes covering the annular part with a vertically directed cylindrical bore having a cylindrical flat bottom, cylindrical flat top located at a certain distance from the said cylindrical flat bottom part and side part, connecting these cylindrical upper and lower part and forming one whole with them, with the specified side portion has an angle of inclination to the horizontal plane from about 1oup to about 89o; covered in detail mushroom shape having a cylindrical piston with a sliding fit in the specified spanning the annular part and a cone-shaped head on one end of the rod, forming one whole with him and with the angle to the horizontal is IGNOU part and performed with her at the same time in a common conical side portion and covering a specified covered and covering details while specified cylindrical lower portion adapted to form a sliding seal between the covering part and the wall of the cylinder 3, and the said conical side portion adapted to serve as a diaphragm, whereby when the sequential application of effort to the specified rod 52 of the piston and removing the deformation of the diaphragm reduces the space in front of the cylinder 3, thus forcing the gas out of it, and when the force is removed, the diaphragm returns to its original shape, causing the absorption. 2C. and 8 C.p. f-crystals, 9 Il.

The invention relates to syringes used for injection of fluids into the patient or their removal from it. More specifically, this invention relates to a mechanical suction piston with the suction action is used together with a mechanical syringe for introduction into the patient's body substances for tomography.

In medical practice, depending on the assigned treatment specific flags subcutaneous injection are sometimes performed in the subcutaneous tissue, while in other cases they need to be done intravenously. In any case, it is important to injection drug doctor knew whether the needle tip for Podgornov is his syringe, which can be created negative pressure is for this definition. Thus, the appearance of the rabbits in the syringe when creating a negative pressure would indicate the presence of a needle tip in a large blood vessel, while the lack of blood would mean finding the tip of the needle into the subcutaneous tissue. Depending on the assigned type of injection you can then immediately do the injection or, if required, to extract and move the tip of the needle.

Suction syringes are usually of two types, namely, automatic or manual suction. In the syringe with manual suction piston in the cylinder of the syringe is then turned back for a short distance. This exhaust piston decreases the pressure in the syringe that is transferred to the fluid at the tip of the needle, which is then observed inside the cylinder of the syringe. From the dense tissue of any liquid will not be drawn into the cylinder. When using a syringe with manual suction injection must be performed with the use of both hands: one to hold the cylinder and the other to pull the piston back. Such pistons with manual suction have the disadvantage that their proper use in a very large degree asiausa syringe suction by creating a first positive pressure in the containing medication is a part of the syringe, for example, vials single use. When the force is removed, causing a positive pressure in the syringe creates a corresponding negative pressure, increasing, thus, the suction action. The present invention relates to this self-priming type syringe.

In the ideal case, self-priming syringe for subcutaneous injection should be relatively simple to reduce to a minimum the cost of manufacture, relatively simple to operate, suitable for handling with one hand; easily adaptable for multiple samosatene; capable of expelling entrapped air from the vial before inserting the needle into the injection site and before self-priming, while not eliminating self-priming subsequently, during operation of the syringe, or otherwise not making it unusable.

Self-priming syringes, proposed by the present invention, automatically mimic the action of a manual syringe slight movement of the piston, thus creating a small negative pressure in the syringe is required for suction. Therefore, the syringes of the present invention are devoid of flaw inherent Izzie from the doctor.

According to the present invention vial for subcutaneous injection, preferably ampoule mechanical syringe contains the injected fluid and provided with a cylinder and a piston capable of reciprocating motion in the specified cylinder, and the piston is characterized by its ability to remove gas from the space in front of the ampoule and then create a vacuum in the ampoule mechanical syringe without having to pull the plunger back to the nearest end of the ampoule.

The suction piston of the present invention contains a covering ring detail covered in detail, with a rod and a cone-shaped head, with the specified stem movably installed in the specified spanning the annular part and an elastomeric diaphragm-shell, covering the specified spanning the annular part and the specified cone-shaped head of the specified covered items.

Covering ring item represents in General the cone-shaped part with a vertically directed cylindrical hole drilled through its centre. The item, which cut off the pointed end of the cone, made of hard polymer material. A special form ohvatyvayuschaya syringe; preferably provided in a cylindrical groove for receiving and retaining the diaphragm-shell, located at a certain distance from the said cylindrical lower portion, and a flat cylindrical upper part located at a certain distance from the cylindrical lower portion and a side portion connecting these cylindrical upper and lower part and forming one whole with them, and the side portion has an angle of inclination to the horizontal plane from about 1oup to about 89opreferably from about 30o60oand most preferably about 45o.

Covered in detail mushroom shape made of a rigid polymeric material and has a cylindrical piston rod with an outer diameter less than the internal diameter of the cover ring part so that the rod will have a sliding fit in the hole covering ring, a conical head on one end of the rod, forming one whole with him. The outer diameter of the side of the head larger than the inner diameter of the hole and covering the annular part. The specified cone-shaped head has an angle of inclination to the horizontal plane from about 1oup to about 89o, preferably, so that after Assembly the head of a covered part and the side cover parts formed a solid cone-shaped node that has outer diameter of the flat upper part of the covering ring detail would be the same as the outer diameter of the bead-covered items.

In the most preferred configuration of the node from covered and covering parts head covered detail combined with covering parts with the formation of a solid cone-shaped piston head, which lateral surface of a cone forming an angle of approximately 45oto the horizontal plane.

For the convenience of operation is desired having a low friction sliding fit between the stem covered items and wall covering ring details.

The third part of the suction piston is elastomeric diaphragm - shell or casing having a cylindrical lower part and performed with her at the same time in a common cone-shaped side part. It is intended to cover assembled together covered and covering parts, while its side serves as a diaphragm, and a cylindrical lower portion as a sliding seal between the rigidly ignea of the diaphragm-shell preferably contains turned inward protrusion for coupling with a cylindrical groove in the lower part of the covering ring details.

It is important to have high friction sliding seal between the cylindrical portion of the aperture of the shell and the wall of the ampoule mechanical syringe to prevent leakage of the contents from it.

When assembled, the piston in the ampoule mechanical syringe is used to remove gas from the front of the ampoule and suction, apply force to the piston rod in the direction to the free end of the ampoule to move covered in detail inside covering parts and, thus, can be made to stretch the side of the diaphragm-shell. Elastic elongation/deformation of the diaphragm decreases the space in the front part of the ampoule and to remove gas from it. When removing the force applied to the rod, the diaphragm returns to its original shape due to its ability to do so, while in a closed system creates a negative gauge pressure, resulting in a suction process.

After the suction process again apply force to the piston rod by actuation of the mechanical syringe. Under the influence of this effort, the piston Assembly will move to a distant end of the amp is mehanicheskogo syringe with suction piston force, is required to move the piston in the ampoule mechanical syringe, exceed the effort required to create a vacuum through a piston.

Therefore, according to the present invention features a self-priming vial for subcutaneous injection, which contains the injected fluid and comprises in General a cylinder having a wall and a piston capable of reciprocating motion in the specified cylinder to create pressure in the ampoule and to eject the specified injected fluid from it, with the specified piston contains:

covering the annular part with a vertically directed cylindrical bore having a cylindrical flat bottom, cylindrical flat top located at a certain distance from the said cylindrical flat bottom, and a side portion connecting these cylindrical upper and lower part and forming one whole with him, with specified side portion has an angle of inclination to the horizontal plane from about 1oup to about 89o;

covered in detail mushroom shape having a cylindrical piston with a sliding fit in the specified ohvatyvajut the inclination of the surface to the horizontal plane from about 1oup to about 89oand

an elastomeric diaphragm-shell having a cylindrical lower part and performed with her at the same time in a common conical side portion and covering a specified covered and covering parts, with the specified cylindrical lower portion adapted to form a sliding seal between the cover ring part and the wall of the cylinder and the cone-shaped side part adapted to serve as a diaphragm, whereby when the sequential application of effort to the specified shock piston and removing the deformation of the diaphragm reduces the space in front of the cylinder, thus forcing the gas out of it, and when the force is removed, the diaphragm returns to its original shape, causing the absorption.

The invention will be described with reference to the following drawings, but it in no way should be construed as limited by them.

In Fig.1 shows axiomatizable image covering the annular part of the suction piston; Fig.2 - axiomatizable image covered the details of the suction piston; Fig.3 is a vertical section covering ring detail in Fig. 1 and covered in detail in Fig.2 in Fig. 5 is a vertical section covering ring detail in Fig.1 and covered in detail in Fig.2, showing covered item in its extended position; Fig. 6 is a vertical section of the assembled suction piston in static close position; Fig. 7 is a vertical section of the assembled suction piston in the dynamic position of the suction blood; Fig. 8 is a vertical section of the suction piston in the ampoule mechanical syringe in static close position; Fig. 9 is a vertical section of the suction piston in the ampoule mechanical syringe in the dynamic position of the absorption blood.

It should be noted that in the present invention, the suction is performed by the way, have no resemblance to the way the suction in the previously described devices for suction, where the rigid connection rod with the piston. In the present invention the absorption arises from the structure of the device, i.e., without the necessity of moving the piston to the middle end of the ampoule.

The suction piston of the present invention is now described with reference to the drawings.

In Fig. 1 shows a covering ring detail of the piston, indicated generally as 10, which is made of hard m the economic side part 40.

The cylindrical lower portion 20 has an upper annular edge 22, the lower annular edge 24 and the recess or groove 26 between them, which is used to place and secure the diaphragm-shell, designated generally as 44 in Fig. 4. Flat top portion 30 located at a certain distance from the cylindrical lower portion 20, is limited to the first annular edge 32 and the second annular flange 34. The upper annular edge 22 of the cylindrical lower portion 20 and the first annular edge 32 connects the side portion 40, which may have an angle of inclination to the horizontal plane from about 1oup to about 89opreferably from about 30o60oand most preferably about 45o.

The angle is determined by the respective diameters of the first annular flange 32 and an upper annular edge 22 of the cylindrical lower portion 20. Vertically parallel cylindrical hole 36 is determined by the diameter of the second annular flange 34.

In Fig. 2 shows a covered item 50 of the suction piston, which has a mushroom-like shape and made of a rigid material, such as plastic. It includes a solid cylindrical rod 52 of the piston and consobrinus sliding fit between them (Fig.1, 2 and 3). Conical head 56 having a Board 57 and the side surface 58 that covers the flat top portion 30 covering the annular part 10. Board 57 should be sufficiently larger than the diameter of the annular flange 34; Board 57 may extend beyond the first annular flange 32, but it should not reach the diameter of the upper annular edge 22 of the cylindrical lower portion 20.

The third part of the suction piston of the present invention is a diaphragm-casing 44, shown in Fig. 4 and 6. It is made from a material with high ability to restore the original shape and inert when in contact with liquid medicines and diagnostic substances. Aperture-shell 44 includes a cylindrical lower portion 42 and generally conical side portion 48. The cylindrical lower portion 42 has an annular ledge 46 facing toward the center of the diaphragm-shell 44 and firmly mounted in the groove 26 covering the annular part 10. The shape of the diaphragm-shell 44 has a close affinity with the form covered and covering part of the suction piston Assembly.

After Assembly of the suction piston of the present invention covered item 50 (Fig.2) is a covering ring is shown in a dynamic position, in which the covered item 50 extended outwards, i.e. its head 56 is located at a certain distance from the flat top portion 30 covering the annular part 10.

In Fig.6 three parts of the suction piston shown in the Assembly and in static close position. Aperture-shell 44 covers the side surface 58 of the cylinder 56 covered parts 50 and covering the annular part 10. The annular ledge 46 of the diaphragm-shell 44 is firmly fixed in the groove 26 of the cylindrical lower portion 20 covering the annular part 10.

If the rod 52 of the piston to apply force in the direction vertically upwards, the diaphragm-shell changes its form and becomes that shown in Fig.7; Annex effort leads to elastic deformation of the diaphragm-shell.

If partially or completely remove the force from the rod 52 of the piston, the ability of the diaphragm-shell 44 restore their original shape will force covered item 50 to return to its initial position shown in Fig.6. When a covered item 50 returns to its static position, in a closed system creates a negative gauge pressure, so the blood or tissue fluid which I in the ampoule 1 mechanical filter. The Assembly is not shown throttle needle or its equivalent for the formation of respective contact with the patient for receiving the liquid composition/biological tools, such as tools for imaging or drugs. Such mounting accessories known in the art. Not shown in the mechanical syringe is attached to the ampoule or in connection with which it is used. However, mechanical syringes are well known in the art. After a pre-filled ampoule prepared to use and made appropriate contact with the patient, you must create a vacuum in the ampoule to ensure penetration in need of a blood vessel.

As also described with reference to Fig.6. the force applied by a mechanical syringe in the vial to the rod 52 of the piston (Fig.8) in the direction towards the tip 2 capsules 1, causes the aperture of the shell 44 to move to a distant end of the ampoule, displacing the gas from the front of the ampoule (Fig.9). When the application of this effort cylindrical lower portion 42 of the diaphragm-shell 44 maintains a tight seal between it and the cylinder wall 3 capsules 1 in the absence of any motion. After removal of the efforts thus the vacuum in the cylinder 3 and sucking the fluid from the patient's body.

To inject the fluid in the vial after the suction process, the rod 52 of the piston making continuous uniform force to displace liquid from the ampoule and its introduction into the patient. For Assembly of the suction piston and capsules is crucial that the force required to overcome the resistance of friction between the cylindrical lower part 42 of the diaphragm-shell 44 and the cylinder 3, the more force is required for the elastic deformation of the diaphragm-shell 44. The force applied by mechanical means to the specified cylindrical piston rod to displace the specified injected fluid exceeds the force required to create the vacuum in the vial for subcutaneous injection.

From the preceding description it is clear that the injection piston of the present invention possesses all the characteristic features of the ideal of the suction piston.

1. The suction piston containing a covering ring detail covered in detail, with a rod movably mounted within the mentioned covering the annular part, wherein the cover part has a tapered head, and that contains elastomeres details.

2. The piston p. 1, characterized in that the covering ring part has a surface, part of which surface is properly truncated cone, and the other part has the shape of a cylinder.

3. The piston p. 2, characterized in that covering the annular part made of a vertical cylindrical hole passing through its center.

4. The piston p. 2, wherein forming the cone-shaped head covered part forms an angle with the axis of the covered parts, essentially equal to the angle between the generatrix of the conical surface covering the annular part and the axis of the piston.

5. The piston p. 4, characterized in that the angle of inclination of the generatrix of the conical surface to a horizontal plane 1 89opreferably between 30 and 60oand more preferably, about 45o.

6. The piston p. 2, characterized in that the cylindrical surface covering the annular part made of a cylindrical groove for receiving and retaining the diaphragm-shell.

7. The piston according to any PP.1 to 6, characterized in that the covering ring detail and covered the item is made of a rigid polymeric material.

8. Self-priming is GCC, and a piston capable of reciprocating motion in the specified cylinder to create pressure in the ampoule and to displace the specified injected fluid from it, characterized in that it contains covering the annular part with a vertical cylindrical bore having a bottom, made in the form of a cylinder, and the upper part in the form of a truncated cone, thus forming a cone has an angle of inclination to the horizontal plane from about 1oup to about 89ocovered in detail, with the rod mounted slidable within the mentioned covering the annular part and a cone-shaped head on one end of the rod, made it in one piece, forming the angle with a horizontal plane of from about 1oup to about 89o, and an elastomeric diaphragm-shell having a cylindrical lower part and performed with her at the same time the cone-shaped upper portion and covering the specified spanning the annular part and the covered item to create a sliding seal between the cover ring part and the cylinder wall, and specified the cone-shaped portion is a diaphragm.

9. Ampoule under item 8, which Teit suction piston PP.1 7.

 

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