Device for selective access closure inside a catheter

Abstract

The device ( 10 ) for selective access closure inside a catheter comprises a conduit ( 14 ) having a rear extremity ( 16 ) for the insertion of a medical instrument and a mechanism ( 27 ) for adjusting the cross-section provided within the conduit ( 14 ). The mechanism ( 27 ) comprises a member ( 32 ) for repositioning the device between an opening movement and a closing movement. The direction of movement of the repositioning member ( 32 ) along both the closing path and the opening path are identical.

1 . Obstruction device ( 10 ) for selective access closure inside a catheter comprising on the one hand a body ( 12 ) bounding a conduit ( 14 ) having a rear extremity ( 16 ) for the insertion of a medical instrument and a front extremity ( 18 ) provided with means ( 19 ) for connection to the catheter and on the other hand a mechanism ( 27 ) for adjusting the cross-section of the passage offered within the conduit ( 14 ), this adjustment mechanism ( 27 ) comprising a member ( 32 ) for repositioning the device which can move with respect to the body ( 12 ) along an opening path to change to an open condition in which the nominal passage cross-section is provided within the conduit ( 14 ) and along a closing path to change to a closed condition in which passage through the conduit ( 14 ) is at least partly obstructed, characterised in that both the direction of movement of the repositioning member ( 32 ) following the said closing path and the direction of movement of the repositioning member following the said opening path are identical.  
     
     
         2 . Device according to  claim 1 , characterised in that the direction (Z-Z) in which the repositioning member ( 32 ) moves along the said opening and closing paths is angularly offset with respect to the axis (X-X) of the conduit ( 14 ).  
     
     
         3 . Device according to  claim 1 , characterised in that the said mechanism ( 27 ) for adjusting the passage cross-section offered within the conduit ( 14 ) comprises a diaphragm ( 60 ,  64 ) and a cannula ( 77 ) movably mounted within the conduit ( 14 ) between a position away from the diaphragm ( 60 ,  64 ) corresponding to the closed condition of the device and a position in which it is engaged through the diaphragm ( 60 ,  64 ) corresponding to the open condition of the device, and in which the mechanism ( 27 ) comprises means for moving the cannula ( 77 ) in one direction and the other alternately between its two positions under the control of the repositioning member ( 32 ) only when the repositioning member ( 32 ) is moved along the said opening and closing paths in a control direction which is the same for the two directions in which the cannula ( 77 ) moves.  
     
     
         4 . Device according to  claim 1 , characterised in that the conduit ( 14 ) is straight, and in that the said repositioning member ( 32 ) can be moved laterally along the said opening and closing paths parallel to the axis (X-X) of the said conduit ( 14 ).  
     
     
         5 . Device according to  claim 3 , characterised in that the mechanism ( 27 ) for adjusting the passage cross-section provided within the conduit ( 14 ) comprises both a slide ( 74 ) with which the cannula ( 77 ) forms one piece, this slide ( 74 ) being capable of being slid in relation to the body ( 12 ) under the control of the said repositioning member ( 32 ), and a ratchet wheel ( 76 ) rotatably mounted with respect to the slide ( 74 ) and fixed axially with respect to the latter, the body ( 12 ) comprising section members ( 144 ) engaging the ratchet wheel ( 76 ) in order to move it angularly when the slide slides, and section members ( 138 ,  140 ) guiding the ratchet wheel ( 76 ) to guide it when the said repositioning member ( 32 ) is released towards at least two different axial positions corresponding to the open and closed conditions of the device.  
     
     
         6 . Device according to  claim 1 , characterised in that the said repositioning mechanism ( 27 ) comprises a resilient return member ( 74 ) for the repositioning member ( 32 ) following the said opening and closing paths in the opposite direction to that bringing about repositioning of the device.  
     
     
         7 . Device according to  claim 1 , characterised in that the body ( 12 ) is of a generally flattened oval shape having two opposite principal surfaces ( 50 A,  50 B) and a peripheral lateral surface connecting the said opposite principal surfaces ( 50 A,  50 B).  
     
     
         8 . Device according to  claim 7 , characterised in that on its peripheral lateral surface the body has at least two adjacent hollows ( 52 A,  52 B) forming supporting surfaces for the fingers of one hand.  
     
     
         9 . Device according to  claim 8 , characterised in that two hollows ( 52 A,  52 B) forming the supporting surfaces for the fingers of the hand are arranged in succession in a direction substantially parallel to the axis (X-X) of the conduit ( 14 ).  
     
     
         10 . Device according to  claim 8 , characterised in that the said control member ( 32 ) projects beyond the casing ( 12 ) between two hollows ( 52 A,  52 B) forming the supporting surfaces for the fingers of the hand and the rear extremity ( 16 ) of the conduit ( 14 ).  
     
     
         11 . Device according to  claim 1 , further comprising means ( 74 ,  136 ) for holding the device in its open condition and in its closed condition.