Vascular access kit

Abstract

Vascular access kit comprising a guidewire and a needle. The guidewire includes elastic core member ending with guidewire tip segment. Guidewire tip segment comprising widening, guidewire tip rear portion extending distally to the widening, and guidewire tip front portion extending distally from the widening. The needle comprising a beveled opening greater in length than guidewire tip front portion. Guidewire tip rear portion includes a flexing portion configured for causing localized buckling and/or bending for inclining guidewire tip front portion relative to guidewire tip rear portion, in needle beveled opening, when the core member is axially compressed.

1 . A vascular access guidewire, comprising:
 comprising an elastic core member ending with a guidewire tip segment comprising a widening, a guidewire tip rear portion extending distally to the widening, and a guidewire tip front portion thicker than the guidewire tip rear portion extending distally from the widening;   
       wherein the guidewire tip rear portion includes a flexing portion configured to cause localized buckling and/or bending for inclining the guidewire tip front portion relative to the guidewire tip rear portion, in the beveled opening, when the core member is axially compressed;
 wherein the flexing portion includes a curved length along which the core member is fixedly deviated laterally relatively to straight aligned portions of the core member proximally and distally adjacent to the curved length. 
 
     
     
         2 . The guidewire according to  claim 1 , wherein the core member comprises of a guidewire proximal segment extending distally to a first narrowing, a guidewire intermediate segment thinner than the guidewire proximal segment extending distally from the first narrowing to a second narrowing, and the guidewire tip segment extending distally from the second narrowing. 
     
     
         3 .- 13 . (canceled) 
     
     
         14 . The guidewire according to  claim 1 , wherein the flexing portion is configured with resistance to bending and/or buckling smaller than the straight aligned portions of the core member proximally and distally adjacent to the curved length. 
     
     
         15 . The guidewire according to  claim 1 , wherein the core member is deviated in at least one axis along the curved length. 
     
     
         16 . The guidewire according to  claim 1 , wherein the core member forms a coil along the curved length. 
     
     
         17 . The guidewire according to  claim 1 , wherein the flexing portion includes at least one localized lateral recess. 
     
     
         18 .- 20 . (canceled) 
     
     
         21 . A method of producing the guidewire according to  claim 2 , comprising:
 forming the first narrowing, the second narrowing, the guidewire tip rear portion and the widening on a pre-machined wire; and   fixedly altering a straight aligned length of the guidewire tip rear portion to form the flexing portion.   
     
     
         22 . The method according to  claim 21 , wherein the forming includes grinding the pre-machined wire. 
     
     
         23 . The method according to  claim 21 , wherein the fixedly altering includes fixedly deforming the straight aligned length into a curved length, along which the core member is fixedly deviated laterally relatively to straight aligned portions of the core member proximally and distally adjacent to the curved length. 
     
     
         24 . The method according to  claim 21 , wherein the fixedly altering includes forming at least one lateral recess or slit from the straight aligned length by way of subtractive manufacturing. 
     
     
         25 . The method according to  claim 21 , comprising connecting a cylindrical coiled member between the first narrowing and the widening of the core member. 
     
     
         26 . The method according to  claim 25 , wherein the coiled member is configured with a first coil pitch along a chosen length thereof and a second coil pitch smaller than the first coil pitch along a remainder length thereof, and the connecting includes surrounding the flexing portion with the chosen coiled member length having the first coil pitch. 
     
     
         27 . A device for forming a vascular access in a blood vessel via an access needle, comprising:
 an elastic core member comprising of a guidewire proximal segment extending distally to a first narrowing, a guidewire intermediate segment thinner than the guidewire proximal segment extending distally from the first narrowing to a second narrowing, a guidewire tip rear portion thinner than the guidewire intermediate segment extending distally from the second narrowing to a widening, and a guidewire tip front portion thicker than the guidewire tip rear portion extending distally from the widening; and   a cylindrical coiled member extending between the first narrowing and the widening of the core member;   wherein the tip rear portion includes a flexing portion configured to affect localized buckling and/or bending for inclining the tip front portion relative to the tip rear portion when the core member is axially compressed;   wherein the coiled member is configured with a first coil pitch along a chosen length thereof surrounding the flexing portion and a second coil pitch smaller than the first coil pitch along a remainder length of the coiled member.   
     
     
         28 . The device according to  claim 27 , wherein the flexing portion includes a curved length along which the core member is fixedly deviated laterally relatively to straight aligned portions of the core member proximally and distally adjacent to the curved length. 
     
     
         29 . A method of forming a vascular access using the guidewire according to  claim 1 , the method comprising:
 penetrating into a blood vessel with a beveled opening of an access needle;   placing the guidewire tip front portion and the flexing portion in the beveled opening;   pushing the guidewire tip front portion via the beveled opening against a wall of the blood vessel until generating a moment on the flexing portion sufficient to trigger local buckling and/or bending until the guidewire tip front portion is inclined relative to the guidewire tip rear portion;   advancing the guidewire distally in the blood vessel; and   allowing the guidewire tip front portion to flex back and/or realign with the guidewire tip rear portion.   
     
     
         30 . The method according to  claim 29 , wherein the flexing portion includes a curved length along which the core member is fixedly deviated laterally relatively to straight aligned portions of the core member proximally and distally adjacent to the curved length, wherein the moment is generated by way of derived opposing forces acting respectively on the curved length and on the straight aligned portion of the core member proximally and/or distally adjacent to the curved length. 
     
     
         31 . The method according to  claim 29 , wherein a length of the beveled opening extends in the wall of the blood vessel. 
     
     
         32 . The method according to  claim 29 , wherein the placing includes orienting the needle at an angle between 60° and 90° between the needle and the blood vessel. 
     
     
         33 . A method of producing the guidewire according to  claim 1 , comprising:
 forming the guidewire tip rear portion, the guidewire tip front portion, and/or the widening on a pre-machined wire; and   fixedly altering a straight aligned length of the guidewire tip rear portion to form the flexing portion.   
     
     
         34 . A vascular access kit, comprising the guidewire according to  claim 1  and a needle comprising a beveled opening greater in length than the guidewire tip front portion.