Classifications

• • 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
  • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
  • A61M5/2033—Spring-loaded one-shot injectors with or without automatic needle insertion
• • 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
  • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
  • A61M2005/2006—Having specific accessories
  • A61M2005/202—Having specific accessories cocking means, e.g. to bias the main drive spring of an injector
• • 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
  • A61M5/46—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 having means for controlling depth of insertion

Definitions

• Said devices housing a syringe of a predetermined size, which may be previously loaded with the drug required by the patient and kept ready for use.
• Said devices are generally cylinder-shaped and resemble a pen enabling the intradermal injection of the drug, thanks to the special mechanisms housed inside.
• the object of this invention is a device specifically preset for the automatic intrader al administration of a drug, which remedies the aforesaid drawbacks, allowing a considerable improvement of its functionality.
• the device described herein essentially consists of a pen-shaped container, preferably made of a- plastic material and made up of two parts joined the one to the other by means of a bayonet or screw joint.
• the top part of the device houses the piston which drives the syringe plunger, the springs allowing this operation and the safety mechanisms which enable the return of the syringe needle inside the bottom part.
• the syringe housing In the bottom part of the device there is the syringe housing, which is provided with a coaxial sliding element, which moves along the longitudinal axis of the device.
• figs. 3 and 5 show a sectional view of the releasing mechanism sequence
• fig. 6 shows the mechanism which stops the syringe inside the lower part of the device
• fig. 7 shows a sectional view of the entire device, with the position of the automatic syringe return mechanism, during the injection
• fig. 8 shows a sectional view of the entire device with the position of the automatic syringe return mechanism after the injection
• figs. 9 and 10 show a sectional view of two positions of the automatic syringe return mechanism.
• the device described herein is very useful for those patients, who require injections at very short notice, without having to carry around a syringe with the drug to be injected.
• the device described herein In order to work correctly the device described herein, as also those already on the market, must be prepared beforehand with the drug and set in such a manner as to be immediately usable whenever required.
• the bottom part 1 shown in fig. 6, from the top part 2, shown in fig. 1.
• these two elements are joined together by means of a screw or bayonet joint.
• the bottom part 1 houses the syringe 3 which, having been loaded beforehand with the required dug, presents the plunger 4 ready to inject th ⁇ drug through the needle.
• a third gasket 24 is also placed in a specific cut between the top part of the syringe 3 and the edge of its housing, in order to prevent any damage to * the top part of the syringe when the piston starts pushing the plunger and the syringe reaches its lower counterborin .
• the automatic return mechanism of the syringe is shown in figs. 7, 8, 9 and 10.
• Fig. 7 shows the spring 18 in its preloaded position, said preloading having been achieved by pulling down the piston 19, before pushing it upwards for loading the spring 13, which pushes the piston 19 when the drug must be injected.
• the spring 18, which enables the return of the syringe and, therefore, the return of the needle 22 inside the device, is kept compressed after the loading, between the counterboring 20 and the backstop 21, assisted in its action by the spherical element 21'.
• the piston 19 has pushed the plunger 4 of the syringe up to the end of its stroke, i.e., at the end of the. injection, the top of the piston 19 causes the backstop 21 to move, thus freeing the previously compressed spring 18 which, taking on the position shown in fig. 8, pulls up the syringe 3 and, consequently, the needle 22 also, which is hidden inside the device, preventing any further accidental contact.
• the traction of the piston 19, therefore, precedes the compression of the piston 19, which is required to load the spring 13 and set the device for working automatically when the cap 5 is pressed.
• the pressure on the cap 5 frees the spring .13 which then discharges its compressed strength onto the piston 19 which pushes the plunger 4, as previously described, and, consequently the syringe 3 and the needle 22 out of the device, thus executing the injection.
• a safety lock shown in figs. 1 and 2 has been provided for.
• a pin 7 is attached to the cap 5 which, in the safety lock position, engages in the horizontal part 9 of the slot 8 (shown in the fig. 2), provided for on the" inside body to which the cap 5 is fixed but free to rotate; when it is in this position, even if the cap 5 is pressed it will not move.
• the pin 7 moves to the vertical part 10 of the slot 8 and, therefore, the cap 5 is free to move downwards when pressed.
• the slot 8 ends on the left side with a vertical groove which acts as a sort of stop and which obliges the user to exert a light pressure in order to return to the previous position.
• the cap 5 when pressed, moves down automatically triggering the mechanism illustrated in figs. 3, 4 and 5.
• the spherical element blocks, the backstop 12, at the top end of the piston 19, thus forcing the spring 13 to remain compressed; the pressure on the cap 5 makes sure that the spherical element 11, pushed by the particular shape of the top end 12 of the piston 19, moves into the housing 14, which it encounters in its path during its movement downwards, enabling the piston 19, pushed by the spring 13, to discharge all its strength onto the plunger 4 of the syringe 3 causing with a single movement the exit of the needle from the device and the intradermal injection of the drug into the patient.

Landscapes

• Health & Medical Sciences (AREA)
• Vascular Medicine (AREA)
• Engineering & Computer Science (AREA)
• Anesthesiology (AREA)
• Biomedical Technology (AREA)
• Heart & Thoracic Surgery (AREA)
• Hematology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Infusion, Injection, And Reservoir Apparatuses (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=11401318

Family Applications (1)

Country Status (3)

Cited By (46)

Citations (5)

• 1992
  • 1992-12-11 IT ITRM920881A patent/IT1256577B/it active IP Right Grant
  • 1992-12-18 WO PCT/IT1992/000166 patent/WO1994013342A1/en active Application Filing
  • 1992-12-18 AU AU33662/93A patent/AU3366293A/en not_active Withdrawn

Patent Citations (5)

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