AUTOMATIC INJECTOR FOR STANDARD MEDICAL SYRINGES

Abstract

The device relates to medical technology, and more particularly to devices for intramuscular and subcutaneous injection. The present automatic injector for medical syringes consists of a housing, a holder for a syringe, a piston follower, a syringe lifting mechanism, a firing button, a lifting spring, a spring for inserting the needle, a spring for expressing the injectable fluid, a safety lock and a mechanical dynamic brake member in the form of a damping mechanism. The technical result is that of increasing the operating efficiency of the device and of reducing sensations of pain from rapid drug delivery during an injection.

Claims

1. An automatic injector for conventional medical syringes, comprising: a housing; a syringe holder arranged in the housing; a plunger follower arranged in an upper part of the housing; a syringe lifting mechanism arranged in the housing; a firing button interacting with a need insertion spring and an injection-fluid expression spring; a lifting spring; a safety lock; and a dynamic brake member configured as a damping mechanism retarding the plunger follower.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG. 1 shows a partial section view of an automatic injector for medical syringes.

[0010] FIG. 2 shows an additional partial section view of the automatic injector for medical syringes.

[0011] FIG. 3 shows an additional partial section view of the automatic injector for medical syringes.

[0012] FIG. 4 shows an additional partial section of the automatic injector for medical syringes.

DETAILED DESCRIPTION OF THE INVENTION

[0013] The device design and operation are explained below.

[0014] To prepare the device shown in FIG. 1-FIG. 4 for intramuscular injection, it is necessary to fill a medical syringe (1) and put a needle thereon. A transparent cap is removed (not shown in the figures). Injection-fluid expression springs (11) at the amount of 2 pieces are stretched. A lifting mechanism (7) is cocked, and a lifting spring (9) and a needle insertion spring (8) are stretched. When a syringe follower (5) is cocked, it is on a follower retainer (17). When the lifting mechanism (7) is cocked, it is on a lifting mechanism retainer (18). The syringe (1) ready for injection is installed in a cartridge (3) on a cartridge holder (4). Resting on a human body, a safety lock (6) moves and makes it possible to press a button (10). When the button (10) is pressed, the retainer (17) is released from its engagement with a housing (2). The needle insertion spring (8) causes the following elements to move:—the follower (5), the injection-fluid expression springs (11), the cartridge holder (4), the syringe holder cartridge (3) and the entire mechanical dynamic brake member in the form of a damper mechanism (23). This movement is made as far as the cartridge holder (4) stops in the lifting mechanism (7). The syringe needle (1) is inserted to a desired depth into the human body. After that, under the retarding action of the damper mechanism (23), a drug is administered at a slow speed due to the resistance of a damper grease (16) against a damper disk (13). This is due to the interaction of a gear rack (22) with a ratchet gear (12) through a ratchet axis (14) and the damper disk (13) which is closed by a damper cover (15). At the end of injection fluid expression from the syringe (1), the retainer (18) is lifted and disengaged from the housing (2), thereby releasing the lifting mechanism (7) which, under the action of the lifting spring (9), removes the needle from the human body. A cartridge holder retainer (24) is used to prevent the device from being incorrectly cocked into the operating state. For the next injection, it is required to replace the syringe with a new one and repeat all the above operations. A prototype model was manufactured, which exhibited excellent positive results and was much more convenient to use than the prior art analogues.

[0015] To allow its sterilization, the prototype model was made of a hygienically approved plastic material that is resistant to antiseptic solutions and resistant to sterilization temperature in autoclaves, and its metal parts were made of stainless steel.

THE LIST OF REFERENCE NUMERALS

[0016] 1. conventional disposable syringe

[0017] 2. housing

[0018] 3. syringe holder cartridge

[0019] 4. syringe cartridge holder

[0020] 5. syringe follower

[0021] 6. safety lock

[0022] 7. syringe lifting mechanism

[0023] 8. needle insertion spring

[0024] 9. lifting spring

[0025] 10. firing button

[0026] 11. injection-fluid expression spring

[0027] 12. gear ratchet

[0028] 13. damper disk

[0029] 14. ratchet axis

[0030] 15. damper cover

[0031] 16. damper grease

[0032] 17. follower retainer

[0033] 18. retainer

[0034] 19. gear

[0035] 20. ratchet

[0036] 21. ratchet wheel

[0037] 22. gear rack

[0038] 23. mechanical dynamic brake member in the form of a damper mechanism

[0039] 24. cartridge holder retainer