Miniature patch-type intelligent control infusion device

Abstract

A miniature patch-type control infusion device includes an infusion unit (102). The infusion unit (102) comprises a drug storage unit(s) (100), a metal piece (110), a piston(s) (120), a rigid screw(s) (130), a rotating shaft (160), a driving unit(s) (150), a driving wheel(s) (140) provided with wheel teeth (141), a power unit(s) (180) and a rebound unit(s) (170). The driving unit (150) includes at least two driving portions (151a, 151b). The driving unit (150) can rotate around the rotating shaft (160) in the driving direction and the returning direction. The power unit (180) and the rebound unit (170) cooperate with each other to apply force to the driving unit (150) to rotate the driving unit (150). The infusion device also includes a position detector(s) (190), the metal piece (110) and the position detector(s) (190) interact to generate signals. Using this infusion device, patients will have more infusion rate options, which increase the flexibility of controlling drug infusion.

1 . A miniature patch-type intelligent control infusion device, comprising,
 an infusion unit, comprising:
 a drug storage unit, a metal piece, a piston and a rigid screw, wherein the piston is arranged in the drug storage unit; the metal piece, fixedly connected to the rigid screw, is arranged on the piston; 
 a rotating shaft, a driving unit and at least one driving wheel provided with wheel teeth, wherein the driving unit includes at least two driving portions, the driving unit rotates around the rotating shaft in a driving direction and a returning direction, when rotating in the driving direction, one of the driving portions of the driving unit pushes the wheel teeth to rotate the driving wheel which engages the rigid screw to move forward in a non-rotating way, when rotating in the returning direction, all of the driving portions of the driving unit slide synchronously on a surface of the wheel teeth; and 
 a power unit and a rebound unit, wherein the power unit and the rebound unit cooperate with each other to apply force to the driving unit to rotate the driving unit; 
   at least one position detector, wherein the metal piece and the position detector interact to generate signals;   a program unit, wherein the program unit is connected to the infusion unit, it converts received signals into a piston position information and selects a specific driving portion of the driving portions to push the driving wheel according to requirements to adjust infusion rate;   an infusion needle, wherein one end of the infusion needle is in communication with an outlet of the drug storage unit, and the other end of the infusion needle pierces a skin surface to achieve drug infusion; and   an adhesive patch, wherein the adhesive patch attaches the infusion unit or the program unit to the skin surface.   
     
     
         2 . A miniature patch-type intelligent control infusion device of  claim 1 , wherein
 the rigid screw is a metal screw, and the metal piece is electrically connected with the metal screw, so that the metal piece and the position detector constitute a capacitor, and an linear movement of the metal piece causes a change in capacitance making the position detector generate an electrical signal of the signals.   
     
     
         3 . A miniature patch-type intelligent control infusion device of  claim 1 , wherein
 the metal piece is a magnetic metal piece, the at least one position detector comprises position detectors, and each of the position detectors is magnetic induction detector, an linear movement of the magnetic metal piece causes a change in a magnetic field around each of the position detectors to make each of the position detectors generate a magnetic signal of the signals.   
     
     
         4 . A miniature patch-type intelligent control infusion device of  claim 1 , wherein
 the infusion unit further includes a clutch structure movably disposed on the driving wheel, the rigid screw passes through the clutch structure, and the clutch structure is provided with an internal thread that cooperates with the rigid screw, the driving wheel drives the clutch structure to rotate which, with the internal thread, pushes the rigid screw to move forward in a non-rotating way.   
     
     
         5 . A miniature patch-type intelligent control infusion device of  claim 1 , wherein
 the infusion unit further includes a blocking wall, and the driving unit stops rotating upon contacting the blocking wall.   
     
     
         6 . A miniature patch-type intelligent control infusion device of  claim 1 , wherein
 vertical projections of front ends of any two of the driving portions on the driving unit do not coincide.   
     
     
         7 . A miniature patch-type intelligent control infusion device of  claim 6 , wherein
 a number of the driving portions provided on the driving unit is n (n≥2), if the distance, in a pushing direction, between the vertical projections of the front ends of any two adjacent ones of the driving portions which cooperate with the driving wheel is t, and a wheel tooth pitch is T, then t=T/n.   
     
     
         8 . A miniature patch-type intelligent control infusion device of  claim 6 , wherein the at least one driving wheel comprises two driving wheels, the driving unit provided with the two driving portions and the two driving wheels are provided in the infusion unit, the two driving wheels are fixedly connected to realize synchronous rotation, the two driving portions are respectively matched with the two driving wheels, the driving wheels are arranged on a same side of the rotating shaft, and the wheel teeth of the two driving wheels are staggered. 
     
     
         9 . A miniature patch-type intelligent control infusion device of  claim 6 , wherein
 the driving unit is provided with the two driving portions, and the two driving portions are matched with the driving wheel, if the distance, in a pushing direction, between the vertical projections of the front ends of two adjacent ones of the driving portions is t 1 , and a tooth pitch is T, then t 1 =3T/2.