JPWO2020255105A5 - - Google Patents

Claims (11)

A fluid injection device (1) suitable for intramuscular and/or subcutaneous injection into a living body,
Said device contains the necessary energy to complete an operating cycle without any action of said user other than a trigger, and has an energy storage mechanism incorporated in housing (2), said energy storage mechanism comprising at least It includes two preload springs (352, 552) that provide energy in two bursts, the first burst providing a first amount of energy suitable to extend at least one needle (454) a sufficient distance. provided from one preloaded spring to pierce the skin of the living body and insert a further distance through the skin to reach the injection site, a second burst injecting a fluid of predetermined viscosity, the fluid from at least one reservoir (602) into said living body and providing a second amount of energy from a second preload spring suitable for retracting said at least one needle from said living body. Said at least one needle (452) has a first end and a second end, said first end and said second end connecting said first end of said at least one needle in use. while translating together such that the direction of movement of the ends is parallel to the patient's skin and the direction of movement of the second end of the at least one needle is substantially non-perpendicular to the skin of the patient, respectively. 2. The device of claim 1 adapted to point to the surface of the . The at least one needle passes through a mandrel that changes the direction of translation of the at least one needle from one orientation, typically parallel to the patient's skin, to a non-orthogonal angle to the patient's skin. 3. Apparatus according to claim 1 or 2 . 4. The apparatus of claim 3 , wherein the mandrel (702) is adapted to deform the needle (452) as it passes through. 4. The device of claim 3 , wherein the mandrel (702) is adapted to deform the needle beyond the elastic limit of the needle, thereby preventing reuse of the device. At least one impermeable membrane on said housing (2) to cover and seal at least one opening (706) in said device through which said at least one needle extends when actuated for injection. 6. Apparatus according to any one of claims 1 to 5 , wherein (704) is affixed. A method of operating a device (1) according to claim 1, comprising the steps of:
a ) when said device (1) is attached to a second device (1) in pairs, removing said device (1) and using one device at a time;
b ) removing the cover (4) and making it unnecessary unless a membrane (704) through which said at least one needle (454) can penetrate is used to seal said device;
c ) pressing the device body (2) against the skin of the living body;
d ) until it is sufficient for any detector (12) to release the push button (14) allowing manual triggering in the next step, or alternatively, said detector (12) is optionally increasing the pressure applied to the skin of said living body until it is sufficient to automatically actuate (200), in which case proceeding to step f;
e ) depressing said push button (14), thereby actuating said trigger mechanism (200) which in turn releases at least one insertion subassembly (300);
f ) using the insertion subassembly (300) to depress at least one needle subassembly (400) until the needle injection end (454) is inserted into the living body at the injection depth; ) through at least one septum (604) of at least one reservoir (602);
h ) locking said insertion subassembly (300) to the main structure (102) once a certain position is reached;
i ) locking said at least one needle subassembly (400) attached to said at least one insertion subassembly (300), simultaneously releasing an injection assembly (500) and a fluid reservoir subassembly (600); ) into said needle subassembly (400);
j ) displacing said at least one septum (604) towards the bottom surface of said at least one reservoir (602) and acting as a piston to force said fluid (606) through said needle extraction tip (456), said at least one injecting into the living body via one needle (452), the at least one needle injection tip (454);
k ) removing the device from the living body;
method including. 8. The method of claim 7 , wherein the at least one needle subassembly (400) is emptied of the at least one reservoir prior to removal in step k when the injection subassembly (500) empties the at least one reservoir. is released from said at least one insertion subassembly (300) and then pushed back to its starting position, thereby pushing said at least one needle ( 452) to prevent harm that an exposed needle may cause. 8. The method of operation of claim 7 , wherein locking in step h is accomplished utilizing a latch system (334). 7. The method of claims 1-6 , wherein at least a portion (754) of the internal channel of the needle (452) for conducting the fluid has a diameter different from a diameter of another portion (756) of the internal channel of the needle. A device according to any one of claims 1 to 3. 11. The device of any one of claims 1-6 , 10 , wherein at least two needles are used simultaneously within one housing to introduce said fluid into said living body.