Injector needle insertion retraction assembly

Abstract

A needle insertor for a medicament delivery device is presented having a driver having a first part movably arranged within the case and a second part connected to the base, a needle assembly movably held by the first part in the case, a rotator arranged in the case and configured to engage the first part for moving the driver, an energy accumulation member configured to interact with the rotator for applying a rotational force on the rotator, a movable stop arranged on the base and configured to interact with the rotator for preventing the rotator from rotating. The first part has a first position where the needle assembly is held inside the case, a second position where the needle portion is positioned outside the case after being moved to pass through the injection site end, and a third position where the needle portion is positioned inside the case.

1 . A needle insertor assembly for a medicament delivery device, comprising:
 a case having a base comprising a needle opening and a driver arm portion;   a driver having a first part rotatably coupled to the driver arm portion, a cam opening and a second part extending outward from the cam opening;   a needle assembly comprising a base portion and a needle portion positioned substantially perpendicular to the needle opening;   a rotator having an axis of rotation arranged in the case and configured to interact with the first part of the driver for moving the driver;   an energy accumulation member configured to interact with the rotator for applying a rotational force on the rotator; and   a movable stop that engages with the rotator to prevent the rotator from rotating;   wherein the second part of the driver is engaged with the base portion of the needle assembly in a first position prior to rotation of the rotavator such that the needle assembly is held inside the case   wherein rotation of the rotator causes the second part to move to a second position where the needle portion is positioned outside the case after being moved to pass through the needle opening to pierce an injection site   wherein further rotation of the rotator moves the second part to a third position where the needle portion is retracted to position inside the case, and   wherein a rotational movement of the movable stop relative to the base and along an axial path that is perpendicular to the axis of rotation of the rotator disengages the movable stop from the rotator to allow the rotational force from the energy accumulation member to rotate the rotator along the axis of rotation causing the second part to move from the first position to the second position and to the third positions.   
     
     
         2 . The needle insertor assembly of  claim 1  further comprising a cannula assembly operatively associated with a guide structure position on the base. 
     
     
         3 . The needle insertor assembly of  claim 2 , wherein the cannula assembly comprises:
 a cannula base portion; and   a cannula portion substantially perpendicular to the needle opening and configured to enter the injection site as the second part moves from the first position to the second position such that the cannula portion is positioned in the injection site before the second part moves to the third position.   
     
     
         4 . The needle insertor assembly of  claim 3 , wherein the cannula base portion includes a medicament input opening, the cannula portion and cannula base portion are hollow so that a medicament can pass through the medicament input opening, the cannula base portion, and exits through the cannula portion. 
     
     
         5 . The needle insertor assembly of  claim 3 , wherein the cannula base portion is positioned between the base portion of the needle assembly and the needle opening such that the needle assembly interacts with the cannula base portion to move the cannula assembly toward the needle opening when the second part moves from the first position to the second position. 
     
     
         6 . The needle insertor assembly of  claim 1 , wherein the movable stop comprises a first protrusion rotatably positioned on the base and a second protrusion configured to movably disengage from the rotator. 
     
     
         7 . The needle insertor assembly of  claim 1 , wherein the movable stop comprises a third protrusion that when rotated relative to the base will cause a second protrusion configured to movably disengage from the rotator. 
     
     
         8 . The needle insertor assembly of  claim 1 , wherein the movable stop comprises a protrusion rotatably movable from a first position engaged with the rotator to prevent rotation of the rotator to a second position disengaged from rotator to cause rotation of the rotator and movement of the second part of the driver from the first position to the second position. 
     
     
         9 . The needle insertor assembly of  claim 1 , wherein the case further comprises an activation opening that provides access to the moveable stop. 
     
     
         10 . The needle insertor assembly of  claim 1 , wherein the rotator comprises a first rotator and a second rotator. 
     
     
         11 . The needle insertor assembly of  claim 10 , wherein the energy accumulation member rotates both the first rotator and the second rotator when the movable stop disengages from the rotator. 
     
     
         12 . The needle insertor assembly of  claim 10 , wherein the second rotator has a cam. 
     
     
         13 . The needle insertor assembly of  claim 12 , wherein the cam is engaged with the cam opening such that rotation of the rotator cause the driver to pivotally move relative to the driver arm portion. 
     
     
         14 . The needle insertor of  claim 10 , wherein the base further comprises:
 a first rotator stand configured to accommodate the energy accumulation member and the first rotator; and   a second rotator stand configured to configured to accommodate the second rotator.   
     
     
         15 . The needle insertor assembly of  claim 2  further comprising a locking member that fixes the cannula assembly to the base structure before the second part of the driver moves to the third position. 
     
     
         16 . The needle insertor assembly of  claim 1 , wherein the needle portion is positioned within the cannula portion when the second part is in the first and second positions and the needle portion is not positioned within the cannula portion when the second part is in the third position. 
     
     
         17 . The needle insertor assembly of  claim 3 , wherein the cannula base portion is positioned between the needle assembly and the injection site end, the needle assembly interacts with the cannula base portion to move the cannula assembly toward the injection site end when the first part moves from the first position to the second position. 
     
     
         18 . The needle insertor of  claim 1 , wherein the base further comprises:
 a container port for accommodating a medicament container;   a piercer coupled with the container port for piercing the medicament container;   a medicament path assembly coupled with the base, the medicament path assembly having a first end connected to the piercer and a second end connected to the cannula assembly;   wherein a medicament can flow from the medicament container through the piercer and the medicament tube assembly to enter the cannula assembly.   
     
     
         19 . A medicament delivery device comprising:
 the needle insertor assembly as claimed in  claim 1 ; and   a container port comprising a piercer positioned perpendicular to the needle portion.   
     
     
         20 . A needle insertor assembly for a medicament delivery device, comprising:
 a case having a base comprising a needle opening and a driver arm portion;   a driver having a first part pivotally coupled to the driver arm portion, a cam opening and a second part extending outward from the cam opening;   a needle assembly comprising a base portion engaged with the second part and a needle portion positioned substantially perpendicular to the needle opening;   a first rotator operatively and a second rotator and sharing a common axis of rotation, where the second rotator comprises a cam slidably engaged in the cam opening such that rotation of the first and second rotators causes movement of the driver;   an energy accumulation member configured to interact with the first rotator for applying a rotational force to both the first and the second rotators; and   a rotatable stop comprising a first protrusion, a second protrusion and a third protrusion, where the second protrusion engages with the first rotator to prevent the rotators from rotating;   wherein the second part of the driver comprises a slot that is slidably engaged with the base portion of the needle assembly in a first position prior to rotation of the rotavator such that the needle assembly is held inside the case   wherein rotation of the first rotator causes the second part to move to a second position where the needle portion is positioned outside the case after being moved to pass through the needle opening to pierce an injection site   wherein further rotation of the first rotator moves the second part to a third position where the needle portion is retracted to position inside the case, and   wherein a rotational movement of the third protrusion of the movable stop about the first protrusion relative to the base disengages the second protrusion from the first rotator to allow the rotational force from the energy accumulation member to rotate the rotators along the axis of rotation causing the second part to move from the first to the second positions.