Mechanical injection pump and method of use

Abstract

A mechanical injection pump wearable by a user to deliver a first fluid and a second fluid, including: a pump body having a first fluid chamber to hold the first fluid and a second fluid chamber to hold the second fluid; a common connector having a first inlet, a second inlet, and a common outlet; a first fluid system including the first fluid chamber, a first button drive connected to the first fluid chamber, and first fluid delivery path between the first fluid chamber and the first inlet; and a second fluid system including the second fluid chamber, a second button drive connected to the second fluid chamber, and second fluid delivery path between the second fluid chamber and the second inlet. Force by the user on the button drive increases pressure within the fluid chamber to drive a predetermined volume of the fluid from the fluid chamber.

1 - 20 . (canceled) 
     
     
         21 . A mechanical injection pump wearable by a user to deliver a first fluid and a second fluid, the mechanical injection pump comprising:
 a pump body defining a first fluid chamber and a second fluid chamber, the first fluid chamber being operable to hold the first fluid and the second fluid chamber being operable to hold the second fluid;   a common connector having a first inlet, a second inlet, and a common outlet;   a first fluid system including the first fluid chamber, a first button drive operably connected to the first fluid chamber, a first fluid delivery path in fluid communication between the first fluid chamber and the first inlet, a first piston slideably disposed in the first fluid chamber, and a first axial shaft operably connected between the first button drive and the first piston, wherein the first axial shaft has external serrations, and the first button drive comprises:
 a linear ratchet operable to engage the external serrations of the first axial shaft; and 
   a second fluid system including the second fluid chamber, a second button drive operably connected to the second fluid chamber, a second fluid delivery path in fluid communication between the second fluid chamber and the second inlet, a second piston slideably disposed in the second fluid chamber, and a second axial shaft operably connected between the second button drive and the second piston;   wherein force by the user on the first button drive causes the linear ratchet to engage the external serrations of the first axial shaft to advance the first axial shaft and the first piston a first predetermined distance into the first fluid chamber to drive a predetermined volume of the first fluid from the first fluid chamber, through the first fluid delivery path to the common connector, and out the common outlet; and   force by the user on the second button drive advances the second piston a second predetermined distance into the second fluid chamber to drive a predetermined volume of the second fluid from the second fluid chamber, through the second fluid delivery path to the common connector, and out the common outlet.   
     
     
         22 . The mechanical injection pump of  claim 21  wherein the first fluid is basal insulin and the second fluid is bolus insulin. 
     
     
         23 . The mechanical injection pump of  claim 21  wherein the predetermined volume of the first fluid is not equal to the predetermined volume of the second fluid. 
     
     
         24 . The mechanical injection pump of  claim 21  further comprising an adhesive patch attached to the pump body, the adhesive patch being operable to affix the pump body to the user. 
     
     
         25 . The mechanical injection pump of  claim 21  wherein volume of the first fluid chamber equals the predetermined volume of the first fluid and volume of the second fluid chamber equals the predetermined volume of the second fluid. 
     
     
         26 . The mechanical injection pump of  claim 25  wherein the volume of the first fluid chamber is not equal to the volume of the second fluid chamber. 
     
     
         27 . The mechanical injection pump of  claim 21  for use with a first fluid reservoir and a second fluid reservoir, wherein the pump body further defines a first reservoir space and a second reservoir space, the first fluid reservoir being removably disposed in the first reservoir space and the second fluid reservoir being removably disposed in the second reservoir space. 
     
     
         28 . The mechanical injection pump of  claim 27  wherein the first reservoir space is complementary in shape to the first fluid reservoir, the second reservoir space is complementary in shape to the second fluid reservoir, and the shape of the first reservoir space is different than the shape of the second reservoir space, so the first fluid reservoir cannot seat in the second reservoir space and the second fluid reservoir cannot seat in the first reservoir space. 
     
     
         29 . The mechanical injection pump of  claim 27  wherein:
 the first fluid reservoir comprises:
 a hollow body; 
 a septum closing one end of the hollow body; 
 a slideable piston disposed within the hollow body; and 
 insulin disposed within the hollow body between the septum and the slideable piston; and 
 
 the first fluid supply path further comprises a hollow needle projecting into the first reservoir space, the hollow needle being operable to pierce the septum and establish fluid communication between the first fluid reservoir and the first fluid chamber when the first fluid reservoir is inserted in the first reservoir space. 
 
     
     
         30 . The mechanical injection pump of  claim 21  for use with a first fluid reservoir and a second fluid reservoir wherein a portion of the pump body adjacent the first fluid reservoir and the second fluid reservoir is transparent. 
     
     
         31 . A mechanical injection pump wearable by a user to deliver a first fluid and a second fluid, the mechanical injection pump comprising:
 a pump body defining a first fluid chamber and a second fluid chamber, the first fluid chamber being operable to hold the first fluid and the second fluid chamber being operable to hold the second fluid;   a common connector having a first inlet, a second inlet, and a common outlet;   a first fluid system including the first fluid chamber, a first button drive operably connected to the first fluid chamber, a first fluid delivery path in fluid communication between the first fluid chamber and the first inlet, a first piston slideably disposed in the first fluid chamber, and a first axial shaft operably connected between the first button drive and the first piston, wherein the first button drive comprises:
 an axially fixed ratchet wheel having exterior teeth and internally engaged with the first axial shaft; and 
 a ratchet assembly operable to engage the exterior teeth of the axially fixed ratchet wheel; and 
   a second fluid system including the second fluid chamber, a second button drive operably connected to the second fluid chamber, a second fluid delivery path in fluid communication between the second fluid chamber and the second inlet, a second piston slideably disposed in the second fluid chamber, and a second axial shaft operably connected between the second button drive and the second piston;   wherein force by the user on the first button drive causes the ratchet assembly to rotate the axially fixed ratchet wheel a predetermined angle to advance the first piston a first predetermined distance into the first fluid chamber to drive a predetermined volume of the first fluid from the first fluid chamber, through the first fluid delivery path to the common connector, and out the common outlet; and   force by the user on the second button drive advances the second piston a second predetermined distance into the second fluid chamber to drive a predetermined volume of the second fluid from the second fluid chamber, through the second fluid delivery path to the common connector, and out the common outlet.   
     
     
         32 . The mechanical injection pump of  claim 31  wherein the first fluid is basal insulin and the second fluid is bolus insulin. 
     
     
         33 . The mechanical injection pump of  claim 31  wherein the predetermined volume of the first fluid is not equal to the predetermined volume of the second fluid. 
     
     
         34 . The mechanical injection pump of  claim 31  further comprising an adhesive patch attached to the pump body, the adhesive patch being operable to affix the pump body to the user. 
     
     
         35 . The mechanical injection pump of  claim 31  wherein volume of the first fluid chamber equals the predetermined volume of the first fluid and volume of the second fluid chamber equals the predetermined volume of the second fluid. 
     
     
         36 . The mechanical injection pump of  claim 35  wherein the volume of the first fluid chamber is not equal to the volume of the second fluid chamber. 
     
     
         37 . The mechanical injection pump of  claim 31  for use with a first fluid reservoir and a second fluid reservoir, wherein the pump body further defines a first reservoir space and a second reservoir space, the first fluid reservoir being removably disposed in the first reservoir space and the second fluid reservoir being removably disposed in the second reservoir space. 
     
     
         38 . The mechanical injection pump of  claim 37  wherein the first reservoir space is complementary in shape to the first fluid reservoir, the second reservoir space is complementary in shape to the second fluid reservoir, and the shape of the first reservoir space is different than the shape of the second reservoir space, so the first fluid reservoir cannot seat in the second reservoir space and the second fluid reservoir cannot seat in the first reservoir space. 
     
     
         39 . The mechanical injection pump of  claim 37  wherein:
 the first fluid reservoir comprises:
 a hollow body; 
 a septum closing one end of the hollow body; 
 a slideable piston disposed within the hollow body; and 
 insulin disposed within the hollow body between the septum and the slideable piston; and 
 
 the first fluid supply path further comprises a hollow needle projecting into the first reservoir space, the hollow needle being operable to pierce the septum and establish fluid communication between the first fluid reservoir and the first fluid chamber when the first fluid reservoir is inserted in the first reservoir space. 
 
     
     
         40 . The mechanical injection pump of  claim 31  for use with a first fluid reservoir and a second fluid reservoir wherein a portion of the pump body adjacent the first fluid reservoir and the second fluid reservoir is transparent.