Automatic injection device

Abstract

An object of the present invention is to provide an automatic injection device that allows setting of conditions of puncture according to the thickness of a syringe needle, the puncture depth, and so forth to reduce pain in the puncture and reduce the impact in the puncture to allow alleviation of anxiety and fear of a patient. An automatic injection device of the present invention has a syringe holder that holds a syringe attachably and detachably, a first drive unit that causes the syringe holder holding the syringe to advance to perform puncture by a syringe needle, and a control unit that controls the first drive unit to control the puncture speed.

1 . An automatic injection device that performs puncture by causing an advance of a syringe having a distal end at which a syringe needle is disposed, the automatic injection device comprising:
 a syringe holder that holds the syringe attachably and detachably;   a first drive unit that causes the syringe holder holding the syringe to advance to perform puncture by the syringe needle; and   a control unit that controls the first drive unit to control a puncture speed.   
     
     
         2 . The automatic injection device according to  claim 1 , wherein
 the first drive unit includes a first electric motor and a first motion converter that converts rotational motion of the first electric motor to linear motion and causes the syringe holder to advance.   
     
     
         3 . The automatic injection device according to  claim 1 , wherein
 thickness of the syringe needle of the syringe is in a range of 18 G to 34 G, and   the puncture speed in puncture with the syringe needle by the first drive unit satisfies 10 to 500 mm/s.   
     
     
         4 . The automatic injection device according to  claim 1 , wherein
 the syringe has, in addition to the syringe needle, a syringe barrel filled with a drug solution and a plunger for infusing the drug solution in the syringe barrel into a subject from the syringe needle with which puncture is performed,   the automatic injection device has a second drive unit that causes the plunger to advance to infuse the drug solution, and   the control unit controls the second drive unit to infuse the drug solution at a predetermined infusion rate after puncture by the first drive unit.   
     
     
         5 . The automatic injection device according to  claim 4 , wherein
 the second drive unit includes a second electric motor and a second motion converter that converts rotational motion of the second electric motor to linear motion.   
     
     
         6 . The automatic injection device according to  claim 4 , wherein
 the first drive unit moves the second drive unit and the syringe holder integrally.   
     
     
         7 . The automatic injection device according to any of  claim 4 , wherein
 the control unit controls the infusion rate of the drug solution by the second drive unit to 1 to 1000 μL/s.   
     
     
         8 . The automatic injection device according to  claim 1 , wherein
 the control unit controls the first drive unit so that a puncture depth when the first drive unit causes the syringe holder to advance to perform puncture with the syringe needle is a depth of 1 to 50 mm.   
     
     
         9 . The automatic injection device according to  claim 4 , wherein
 the control unit controls the first drive unit to cause the syringe holder to retreat and withdraw the syringe needle after elapse of a predetermined stop time after drug solution infusion by the second drive unit.   
     
     
         10 . The automatic injection device according to  claim 1 , wherein
 the control unit variably controls a puncture speed in the middle of puncture in the puncture with the syringe needle by the first drive unit.