the following detailed description should be read with reference to the drawings in which like elements in different drawing are numbered identically . the drawings , which are not necessarily to scale , depict selected embodiments and are not intended to limit the scope of the invention . examples of constructions , materials , dimensions , and manufacturing processes are provided for selected elements . all other elements employ that which is known to those skilled in the field of the invention . those skilled in the art will recognize that many of the examples provided have suitable alternatives that may also be used . fig1 shows a first embodiment of the guide wire 10 . core 20 may be 50 - 450 cm in length and 0 . 008 - 0 . 038 inches in diameter depending on the medical application . the distal portion 25 of core 20 may be tapered to provide flexibility to guide wire 10 . preferably the tapered distal portion 25 is formed by grinding 5 - 20 cm of core 20 . the tapered distal portion 25 may be ground into a conical shape with a circular cross - section or stamped such that it has a rectangular cross - section . core 20 may be formed of a super - elastic material such as the alloys of nickel and titanium , commonly known as nitinol . while nitinol is the most common super - elastic material , any of a variety of other super - elastic materials may be used for core 20 . other alloys by chemical name include ; cualni , cusn , cuzn , inti , nial , fept , mncu , and femnsi . a detailed discussion of super - elastic alloys and their processing is presented in u . s . pat . no . 4 , 925 , 445 to sakamoto and is herein incorporated by reference . in addition to super - elastic materials , linear - elastic materials may be used . linear - elastic materials are describe in u . s . pat . no . 5 , 238 , 004 to sahatjian which is also incorporated by reference . in general , linear - elastic materials are composed of the same alloys above . however , different material processing strategies are used to provide a wire which has many of the important characteristics of a super - elastic material without some of the difficulties related to machining , specifically grinding . as such , core 20 may preferably be formed of a linear - elastic alloy of nickel - titanium . surrounding core 20 is coil 30 . coil over core wires are well known in the art and are described in detail in u . s . pat . no . 5 , 147 , 317 to shank which is incorporated by reference . coil 30 may be made of a variety of metallic materials including super - elastic or linear - elastic materials such as nitinol , radio - opaque materials such as gold or tungsten , precipitation hardenable alloys such as the non - ferrous cobalt - based alloys mp35n or elgiloy ™ and the ferrous alloys such as k91 from sanvic corp . and ph455 from carpenter , or more conventional stainless steel alloys such as 304 . preferably coil 30 may be 0 . 001 - 0 . 015 inches in diameter , and made of 304 stainless steel . coil 30 is wrapped around substantially the entire length of core 20 . preferably , coil 30 is not wrapped around the tapered distal portion 25 of core 20 . coil 30 may be formed of flat ribbon ranging in dimensions 0 . 001 - 0 . 003 inches in thickness by 0 . 005 to 0 . 015 inches in width . coil 30 is wrapped in a helical fashion about core 20 by conventional winding techniques . the pitch of adjacent turns of coil 30 may be tightly wrapped so that each turn touches the succeeding turn or the pitch may be set such that coil 30 is wrapped about core 20 in an open fashion shown at 35 . preferably , the pitch coil 30 is such that the coils are tightly wrapped over most of the proximal portion of core 20 with the pitch of each turn changing such that coil 30 has an open wrap shown at 35 near the distal end of core 20 . varying the pitch of coil 30 allows guide wire 10 to have a more flexible distal segment . alternatively , coil 30 may be formed of cross - wound multifilar or multifilar single coil wire . multifilar cross - wound coils are described in u . s . pat . no . 4 , 932 , 419 to de toledo which is herein incorporated by reference . a cross - wound multifilar coil consists essentially of a first inner coil of multiple coil wires wound in a first helical direction and a second outer coil of multiple coil wires disposed about the first coil and wound in a second opposite helical direction . coil over core wires tend to wind up and store energy when torqued rather than transmitting the torque . multifilar coils provides less wind up and therefore lessen the potential for the distal tip of the wire to whip while the proximal end is being turned . bonding core 20 to coil 30 also improves the torque transmission of guide wire 10 . coil 30 may be bonded to core 20 along the length of core 20 or in discrete sections . bonding may be achieved in a variety of ways including using adhesives , brazing , welding , crimping , and swaging . welding may be done through any of the techniques known in the art including spot welding using laser or resistance welding or ball welding using laser or plasma welding . soldering may be done through any of the techniques known in the art and must include the step of preparing the surface of the nitinol core 20 by plating or etching . preferably the coil 30 will be bonded to the core 20 by laser spot welding thereby removing the need for preparing the surface of the core 20 . laser spot welding is also advantageous because it may be done through coatings . an alternative method of bonding the coil 30 to the core 20 is to provide a stainless steel hypotube ( not shown ) with an inner diameter dimensioned to closely fit about core 20 . the stainless steel hypotube may then be crimped onto core 20 and the coil 30 wound about the hypotube . the hypotube then provides a surface which is much easier to bound to a stainless steel coil 30 using conventional methods . metal a foils or other materials may also be used as an intermediate which facilitates bonding between the coil 30 and the core 20 . yet another bonding method utilizes the polymer jacket 40 of the distal tip . the polymer may be applied in a manner that allows the polymer to flow between the coil and core . the polymer will provide a high integrity bond which will help to prevent the polymer jacket from separating from the coil 30 and bond the coil to core 20 . in addition to the these improvements , the polymer coating will make a better transition from the core 20 to the distal portion 25 . a tip bonded in this manor provides a further improvement by producing coloration differences between the coil wire and polymer . these differences act as stripes for the detection of guidewire advance in endoscopy application . the distal portion 25 of core wire 20 may further include a polymer tip 40 . polymer tip 40 serves several functions . polymer tip 40 improves the flexibility of the distal portion 25 of core wire 20 . choice of polymers for polymer tip 40 will vary the flexibility of the distal portion 25 of core wire 20 . for example , polymers with a low durometer or hardness will make a very flexible or floppy tip . conversely , polymers with a high durometer will make a wire tip which is stiffer . polymer tip 40 also provides a more atraumatic tip for guide wire 10 . an atraumatic tip is better suited for passing through fragile body passages . finally , polymer tip 40 may act as a binder for radio - opaque materials . loading polymers with radio - opaque materials is well known in the art for producing a bright image under fluoroscopy and thereby allowing the user of guide wire 10 a better understanding of where the distal portion 25 of guide wire 10 is located within a patient &# 39 ; s body . suitable medical grade radio - opaque materials include tungsten , platinum , and iridium . suitable polymeric materials for polymer tip 40 include urethanes , elastomeric nylons such as pebax , silicones , and co - polymers . polymer tip 40 may be a single polymer , multiple layers , or a blend of polymers . coating ( not shown ) may also be done to the wire proximal to polymer tip 40 . hydrophobic coatings such as fluoropolymers provide a dry lubricity which improves guide wire handling and device exchanges . a second lubricious polymer ( not shown ) may coat distal portion 25 of guide wire 10 or the entire wire 10 . lubricious coatings improve steerability and improve lesion crossing capability . suitable lubricious polymers are well known in the art and may include hydrophilic polymers . guide wire 10 may further include a colored coating . colored guide wires are described in detail in u . s . pat . no . 5 , 739 , 779 to rowland which is herein incorporated by reference . in general , colored coatings may improve the visibility of the guide wire when it is being used in an endoscopic procedure . striping may also be done . striping allows the physician to gauge wire movement and position . striping may be achieved by spray coating different colors on the wire 10 . another way to stripe the wire 10 is to coat the wires of coil 30 prior to winding . fig2 depicts a second embodiment of the high performance coil wire where like elements are similarly numbered . all design advantages , materials of construction , and methods of manufacture are similar to those described above unless explicitly modified below . guide wire 10 is comprised of a solid core 20 surrounded by a coil 30 . the distal portion 25 of core 20 may be tapered as described above or preferably is not tapered . similar to the embodiment of fig1 , the distal portion 35 of coil 30 changes pitch to provide a softer less traumatic tip . guide wire 10 further includes a rounded tip 37 . tip 37 may be polymeric or a metal tip welded to the distal portion 35 of coil 30 . unlike common spring tipped guide wires , guide wire 10 does not have a safety ribbon connecting core 20 to tip 37 . instead guide wire 10 may include a polymer 40 which may be flowed into the space between coils 35 and the space between the distal portion 25 and tip 37 . as shown in fig2 , polymer 40 flows proximally from tip 37 and terminates at a distal facing surface of a proximal portion of coil 30 without any portion of the polymer 40 extending proximally of the distal facing surface of the proximal portion of coil 30 . suitable polymers are described above where choice of polymer may control the flexibility of the tip . polymer 40 may also be loaded with radio - opaque materials . finally , guide wire 10 may be coated as described above and may also include various colors or stripes . the distal portion of guide wire 10 is thereby provided with a very floppy tip which uses polymer 40 as a safety ribbon instead of a metallic safety ribbon . guide wire 10 is provided with the advantage that core 20 does not need to be ground . while the specification describes the preferred designs , materials , methods of manufacture and methods of use , those skilled in the art will appreciate the scope and spirit of the invention with reference to the following claims .
a high performance coil over - core guide wire . the guide wire incorporates a nickel - titanium core with a stainless steel coil to provide a wire with improved kink resistance and good pushability .