US20190099237A1 - Intravascular Data Collection Probes and Related Assemblies - Google Patents

Abstract

In one embodiment, the disclosure relates to a probe that a cylindrical marker band defining an inner surface, an outer surface, a first end and a second end and having a band length, the inner surface defining a marker band bore, the cylindrical marker band includes a radiopaque material; a molded unitary lens defining an elongate optical fiber receiving section having a fiber section length and a beam directing surface, wherein the fiber section length and the band length overlap along an overlap distance; and an optical fiber, wherein a first section of the optical fiber is disposed in the optical fiber receiving section, wherein a portion of the first section of the optical fiber is disposed within the marker band bore.

Description

RELATED APPLICATIONS
• This application claims priority to and the benefit of U.S. Provisional Patent Application No. 62/567,189, filed on Oct. 2, 2017, the disclosure of which is herein incorporated by reference in its entirety.
BACKGROUND
• Various types of intravascular probes have been developed to image lumens. Some of these probes use an optical fiber as a rotatable element to send and receive optical signals. Other rotating transceivers are used for other probe designs. Spinning an optical fiber and an optical beam director as part an intravascular probe can result in rotational variations, imbalances, and twisting of the fiber. These and other unwanted effects that plague such rotatable probes can be generally described as non-uniform rotational distortion or “NURD.”
• For example, the geometrical accuracy along the lateral direction may be affected by NURD), resulting in a stretched or compressed appearance of the lateral dimension of object being imaged. This can result in improper detections such as when imaging a strut in an artery, for example. The geometrical accuracy along the pullback direction may also be affected by non-uniform relative pullback speed between the imaging element and the tissue being imaged. These and other types of noise can contribute to imaging artifacts such as chatter and others.
• It is desirable to reduce or prevent NURD when designing probes and systems that use them for data collection in a lumen or other environment in order to reduce imaging artifacts and other negative design consequences that follow from NURD. For example, U.S. Pat. No. 6,891,984 entitled “Scanning miniature optical probes with optical distortion correction and rotational control” describes the use of viscous damping fluid to reduce or prevent NURD effects in the context of imaging probes. The use of such fluids is suitable for use in some embodiments, but other approaches to resolve NURD more broadly remain outstanding.
• Accordingly, a need exists for systems, designs and methods to reduce or prevent NURD such that its negative effects on data collected using rotating probes and/or components thereof can be mitigated or removed.
• The present disclosure addresses this need and others.
SUMMARY
• In part, the disclosure relates to probe embodiments that reduce length of a section of probe that has greater stiffness compared to torque wire or other sections of probe. This reduction in stiff section length can be implemented such as with regard to an imaging assembly that includes a lens, marker band, and an optical fiber section. A reduction in stiffness length has been evaluated and found to reduce NURD in various probe configurations. A reduction in NURD also can result in a reduction in other unwanted effects such as chatter.
• In part, the disclosure relates to intravascular data collection probe. The probe may include a marker band defining a bore, an outer surface, a first end and a second end, the marker band having a band length, the marker band comprising a radiopaque material; a lens defining a beam directing surface, the lens partially disposed in the bore, wherein the beam directing surface extends past the second end; an optical fiber disposed in the marker band, wherein a section of the optical fiber extends from the first end of the marker band, the optical fiber optically coupled to the lens.
• The probe may further include a jacket defining a jacket bore, wherein the marker band, the lens, and a section of the optical fiber are disposed in the jacket bore. The probe may further include a torque wire defining a torque wire bore and a torque wire end face, wherein the optical fiber extending from the marker band is disposed in the torque wire bore, wherein the first end of the marker band is joined to the torque wire end face. In one embodiment, the marker band is joined to the torque wire end face by a butt weld. The probe may further include a jacket defining a jacket bore, wherein the marker band, the lens, and a section of the optical fiber are disposed in the jacket bore. In one embodiment, the first end of the marker band and the torque wire end face are disposed in the jacket bore.
• In one embodiment, the torque wire end face defines a bevel oriented at a bevel angle relative to a longitudinal axis of the torque wire bore, wherein the end face is welded to the first end of the marker band. In one embodiment, lens is a molded unitary lens defining an elongate optical fiber receiving section having a fiber section length and a beam directing surface. In one embodiment, a first section of the optical fiber is disposed in the optical fiber receiving section, wherein a portion of the first section of the optical fiber is disposed within the marker band bore. In one embodiment, the torque wire defines a first outer diameter at the first endface and a second outer diameter at the second endface, wherein the second outer diameter is less than the first outer diameter. In one embodiment, the second outer diameter spans a distance from the second end face until the second outer diameter reaches a step up to the first outer diameter.
• In one embodiment, a portion of the second end of the torque wire that defines the second diameter is disposed within the bore of the marker band. In one embodiment, the bevel angle ranges from about 20 degrees to about 60 degrees. In one embodiment, torque wire has a first stiffness, wherein marker band has a second stiffness greater than the first stiffness, wherein sum of length of marker band and length of lens extending from marker band defines a stiffness section. In one embodiment, the length of the stiffness section ranges from about 2 mm to about 3 mm. In one embodiment, the probe is configured to reduce chatter when rotating the probe and collecting image data.
• The probe may further include a coating. The coating is disposed on or relative to the lens such that the lens and the coating define a compound lens system. In one embodiment, the marker band is substantially cylindrical. In one embodiment, the torque wire is connected to the marker band by a joint substantially in a single plane. In one embodiment, the lens is a molded unitary lens defining an elongate optical fiber receiving section having a fiber section length and a beam directing surface. In one embodiment, the marker band and torque wire are joined by a flexible junction. In one embodiment, the fiber section length and the band length overlap.
• In one embodiment, an elongate cylindrical component of a probe includes an end, wherein a bevel is defined by or otherwise formed from the end of the component. The bevel has an associated angle relative to an axis of the cylindrical component that ranges from about 20 degrees to about 60 degrees. In one embodiment, the elongate component is a torque wire. In one embodiment, the component is a ring or band such as a marker band that includes a radiopaque material. In one embodiment, the probes disclosed herein include a joint or hinge that couples, connects, or otherwise spans two adjacent elongate components of the probe. The joint or hinge is flexible such that it self-aligns when the probe or a portion thereof rotates.
• In one embodiment, a probe that includes a torque wire, a marker band that includes a radiopaque material and an optical fiber disposed in the core of the torque wire and a section of the optical fiber is disposed within the marker band. In one embodiment, the probe has a section that is stiff relative to one or more sections of the torque wire. This stiff section has a section length in one embodiment. In one embodiment, reducing the section length reduces NURD. In one embodiment, the length of the stiff section is less than or equal to about 3.5 mm. The In one embodiment, the length of the stiff section is less than or equal to about 3.4 mm. In one embodiment, the length of the stiff section is less than or equal to about 3.3 mm. In one embodiment, the length of the stiff section is less than or equal to about 3.2 mm. In one embodiment, the length of the stiff section is less than or equal to about 3.1 mm. In one embodiment, the length of the stiff section is less than or equal to about 3.0 mm. In one embodiment, the length of the stiff section is less than or equal to about 2.9 mm. In one embodiment, the length of the stiff section is less than or equal to about 2.8 mm. In one embodiment, the length of the stiff section is less than or equal to about 2.7 mm. In one embodiment, the length of the stiff section is less than or equal to about 2.6 mm. In one embodiment, the length of the stiff section is less than or equal to about 2.5 mm. In one embodiment, the length of the stiff section is less than or equal to about 2.4 mm. In one embodiment, the length of the stiff section is less than or equal to about 2.3 mm. In one embodiment, the length of the stiff section is less than or equal to about 2.2 mm. In one embodiment, the length of the stiff section is less than or equal to about 2.1 mm. In one embodiment, the length of the stiff section is less than or equal to about 2.0 mm. In one embodiment, the length of the stiff section is less than or equal to about 1.9 mm. In one embodiment, the length of the stiff section is less than or equal to about 1.8 mm. In one embodiment, the length of the stiff section is greater than about 2.0 mm and less than about 3.2 mm. In one embodiment, the length of the stiff section is greater than about 2.0 mm and less than about 2.5 mm.
• In one embodiment, the probe includes a lens such as molded lens. The molded lens can include a trough or channel. An elongate substantially cylindrical section of the molded lens is disposed within the marker band. In one embodiment, the length of the section of the molded lens disposed in the marker band is less than about 2.4 mm. In one embodiment, the length of the section of the molded lens disposed in the marker band ranges from about 0.8 mm to about 1.6 mm. In one embodiment, the distance from an end face of the marker band abutting or adjacent to the torque wire to the distal end of the lens ranges from about 2 mm to about 2.8 mm. In one embodiment, the distance from an end face of the marker band abutting or adjacent to the torque wire to the distal end of the lens ranges from about 2 mm to about 3 mm.
• In one embodiment, dipping or adhesives can be used to form a tube or shell or other layer around the imaging assembly having an OD less than or equal to the OD of the torque wire. In one embodiment, various end points can be selected as the basis for stiffness measures. In one embodiment, the stiffness measurements are made from the tip of the lens to where coil of torque wire bends based on size of the weld and number of coils of torque wire welded.
• In one embodiment, the marker band may be glued, welded, and/or soldered to torque wire. The torque wire may have bevel or L-Grind. When glued, the marker band may be spaced away from the torque wire. In one embodiment, the outer tubing may be left in place or removed after gluing or otherwise fixing or attaching the components of the imaging assembly and/or probe. In one embodiment, conformal coatings can be applied to the imaging assembly. Multi-layer extruded materials can be used. In one embodiment, a jacket is used to mold or shape a material and then the jacket is split and peel away to leave a material layer around a portion or all of the imaging assembly. In some embodiments, the jacket is left in place. In one embodiment, the jacket is disposed such that it straddles or otherwise covers a weld such as a butt weld or butt joint used to attach the torque wire and the marker band. The jacket can include PET in one embodiment. The jacket has a jacket bore that can receive one or more elements of imaging assembly such as lens, marker band, and section of optical fiber in optical communication with lens.
• Although, the disclosure relates to different aspects and embodiments, it is understood that the different aspects and embodiments disclosed herein can be integrated together as a whole or in part, as appropriate. Thus, each embodiment disclosed herein can be incorporated in each of the aspects to varying degrees as appropriate for a given implementation.
• Other features and advantages of the disclosed embodiments will be apparent from the following description and accompanying drawings.
BRIEF DESCRIPTION OF DRAWINGS
• The figures depicted and described herein are not necessarily to scale, emphasis instead generally being placed upon illustrative principles. The figures are to be considered illustrative in all aspects and are not intended to limit the disclosure, the scope of which is defined only by the claims.
• FIG. 1 is a schematic diagram that illustrates a cross-section view of a probe that includes an optical fiber, a torque wire, a lens and other components according to an illustrative embodiment of the disclosure.
• FIG. 2 is a schematic diagram that illustrates an imaging core assembly with a torque wire that includes a beveled end according to an illustrative embodiment of the disclosure.
• FIG. 3A is a schematic diagram that illustrates an imaging core assembly that includes a torque wire with L-grind detail according to an illustrative embodiment of the disclosure.
• FIG. 3B is a side view of a rendering that illustrates an imaging core assembly that includes a torque wire with a butt weld joint according to an illustrative embodiment of the disclosure.
• FIG. 3C is a cross-sectional view that illustrates an imaging core assembly that includes a torque wire with a butt weld joint according to an illustrative embodiment of the disclosure.
• FIG. 3D is a cross-sectional view of a data collection probe in which a molded lens is shown attached to an optical fiber according to an illustrative embodiment of the disclosure.
• FIG. 3E is a top view of the data collection probe ofFIG. 3D in which a molded lens is shown attached to an optical fiber according to an illustrative embodiment of the disclosure.
• FIG. 4A is a schematic diagram that illustrates an imaging core assembly that includes a torque wire and marker band that are welded or otherwise attached or hinged together according to an illustrative embodiment of the disclosure.
• FIG. 4B is a zoomed in view ofFIG. 4A showing bevel angle w according to an illustrative embodiment of the disclosure.
• FIG. 5 is a plot of the NURD in catheters based on the length of the relevant section and other parameters according to an illustrative embodiment of the disclosure.
• FIG. 6 is a perspective view that illustrates a catheter with an imaging core assembly according to an illustrative embodiment of the disclosure.
• FIGS. 7A-7C are schematic diagrams that illustrate the arrangement of a catheter and some of its components and subassemblies suitable for use with a probe having an imaging assembly.
• FIG. 8A is a series of OCT image frames (frame A to frame J) obtained using an OCT imaging probe and an OCT imaging system in which a first level of chatter is present during imaging.
• FIG. 8B is a series of OCT image frames (frame F1 to frame F7) obtained using an OCT imaging probe and an OCT imaging system in which a second level of chatter is present during imaging, wherein the second level of chatter is less than the first level of chatter.
DETAILED DESCRIPTION
• In part, the disclosure relates to probes that reduce NURD and improve imaging. In one embodiment, a probe is described that constrains the outer diameter of the probe to match the outer diameter of the torque wire used to rotate the probe and the optical assembly located distal to the rotating drive source. A stiff section that overlaps with one or more sections of the lens is designed to be reduced to a minimum value or within a range of allowed values. Exemplary stiff section values are described in more detail herein. The stiff section can be commensurate with the marker band. In one embodiment, the probe is designed to increase concentricity to a relative maximum or maximum value and reduce angularity to a relative minimum or minimum value. The stiff section is a relative stiffness compared to other sections of the probe or the imaging assembly in various embodiments.
• In one embodiment, the probe includes a lens such as molded lens. The lens may be coated to create a compound lens system. An elongate substantially cylindrical section of the molded lens is disposed within the marker band. In one embodiment, the length of the section of the molded lens disposed in the marker band is the stiffness section length. In one embodiment, the length of the section of the molded lens disposed in the marker band is less than about 2.4 mm. In one embodiment, the length of the section of the molded lens disposed in the marker band ranges from about 0.8 mm to about 1.6 mm. In one embodiment, a subset of the torque wire is ground to be received by the marker band.
• Various embodiments described herein use a torque wire that is paired with other optical and mechanical elements such that the torque wire can rotate within a catheter having an imaging window with minimal or reduced NURD caused by the flexing of the wire during rotation. The current state of the art uses a dual layer torque coil. Other torque wires can be used. The torque wire is typically attached to an imaging core assembly (also referred to as an imaging assembly) when used as part of an imaging probe. The imaging probe can be used in an intravascular capacity and has adjustments specified in terms of section stiffness to reduce NURD and improve navigation in tortuous vessels.
• In some embodiments, the imaging core assembly includes one or marker bands welded to the outer diameter of the torque wire. In some embodiments, the imaging core assembly includes two marker bands welded to the outer diameter of the torque wire. Such an implementation has an increased outer diameter at the location of the marker bands, which may increase non-uniform rotational distortion (NURD). Additionally, any non-concentricity of the marker bands or the lens assembly may also increase NURD. Various probes designs also include a relatively long stiff section, which also has potentially negative impact on NURD. These designs and others can also result in the lens of the imaging assembly being oriented a slight angle relative to the catheter which receives the imaging probe. This may increase NURD.
• Various approaches have been analyzed such that new designs with various NURD mitigating features can be implemented. For example, some of the embodiments discussed in more detail below relate to probes that avoid marker bands on the outer diameter of the torque wire an imaging probe, allowing for a reduction in NURD. This can, in turn, result in improved imaging when detecting stent struts.
• To mitigate NURD, the present disclosure relates, in part, probes without marker bands on the outer diameter of the torque wire. This can be accomplished with various arrangements, welds, joins, joints, linkages, and lens choices and orientation and overlap of the foregoing as described in more detail herein. In addition, it is been determined that be reducing the length of one or more stiff sections of the probe and/or imaging assembly, NURD is reduced. Overlapping probe components is used to reduce stiff section lengths in some embodiments. Thus, a portion of a lens can overlap with a marker band in some embodiments. A jacket or sleeve and adhesive disposed in the sleeve can also be arranged to overlap with a section of the optical fiber, the molded lens, and a portion of the marker band. Typically, the optical fiber is disposed in a bore or channel of molded lens attached to molded lens with adhesive. Adhesive is also used to secure the marker band relative to the molded lens and sleeve/sheath/jacket. In general, selecting geometries and arrangements for probe components that increase concentricity and that reduce angularity are also advantageous.
• In part, the disclosure relates to rotatable components of data collection probes and rotatable probes that are designed to reduce NURD or otherwise be centrally rotationally balanced. The geometrical accuracy along the lateral direction may be affected by NURD, resulting in a stretched or compressed appearance of the lateral dimension of the struts. As a result, probe designs that reduce imaging artifacts may also improve the detection of stent struts. As a result, the disclosure also relates to methods of reducing, mitigating or otherwise managing NURD to improve imaging or other data collection using a rotatable probe.
• The following discussion presents detailed descriptions of the several embodiments of an imaging probe that avoids marker bands on the outer diameter of the imaging core assembly. In this way, by not increasing the diameter of the probe over a segment of its length through the use of an elongate radiopaque band defining a bore, NURD can be further reduced. It also becomes easier to move and position the imaging assembly through a torturous environment in some embodiments. The embodiments of the present disclosure have wide application, and may be used on any probes, pressure sensors, torque wire-based devices and components thereof.
• Some embodiments of probes are suitable for use as disposable intravascular data collection probes such as OCT, IVUS, or combination imaging probes. Further, although generally described in the context of data collection, medical procedures and medical devices, in part, the devices and methods described herein also generally relate to probes for lumens and thus have applications outside of the medical field as such devices can be adapted or configured, whole or in part. Accordingly, the following descriptions and illustrations herein should be considered illustrative in nature, and not limiting the scope of the invention, as claimed.
• In part, the disclosure includes features that relate to an imaging core assembly.FIG. 1 illustrates one embodiment of an exemplarydata collection probe50 that includes animaging core assembly100 that includes nomarker bands102 on the outer diameter of the probe. In one embodiment, the imaging core assembly attaches to a torque wire such astorque wire101. The imaging core assembly can include a sleeve, sheath, or jacket112 (generally referred to as a jacket) that can have a tube or cylindrical geometry. Thejacket112 can be filled or contacted with adhesive that secures the molded lens and fiber to the marker band and the jacket. In one embodiment, the sleeve orjacket112 extends over the marker band and a joint or weld attaching the torque wire to the marker band. In various embodiments, the sleeve orjacket112 defines a bore in which the lens, marker band, a segment of the optical fiber, and a section of the torque wire are disposed.
• Adhesive disposed in thejacket112 can also attach other components disposed with the sleeve. In various embodiments, probe designs avoid increasing outer diameter beyond outer diameter of torque wire. Theimaging core assembly100 includes a portion oftorque wire101 and amarker band102. In some embodiments, theimaging core100 does not include thetorque wire101 but is coupled or other connected thereto.
• In some embodiments, the end of thetorque wire101 may be beveled at an angle. The angle can be used to facilitate a joint, a weld and/or the wicking of weld or adhesive material. In other embodiments, the end of thetorque wire101 may be modified by an L-grind. The bevel or the L-grind at the end of thetorque wire101 is intended to help center themarker band102 in order to keep the entireimaging core assembly100 concentric. It can also increase joint/weld strength. In some embodiments, thetorque wire101 may be smooth. InFIG. 1, light or electromagnetic radiation λ, is shown propagating along a longitudinal axis of theoptical fiber103 and then being directed out into a lumen or other environment bylens104. Reference to λ, in figures shows light entering or exiting probe.
• In one embodiment, themarker band102 is positioned on the inner diameter of theimaging core assembly100. In other embodiments, themarker band102 may be flush against theouter diameter108 in order to minimize theouter diameter108 of theimaging core assembly100. In one embodiment, theinner diameter109 andouter diameter108 of the imaging assembly corresponds to that of the sleeve orjacket112 that surrounds a portion of the lens and marker band. In some embodiments, themarker band102 may be of an equal or smaller outer diameter than thetorque wire101. Themarker band102 is positioned along theinner diameter109 of theimaging core assembly100 in order to minimize NURD.Lens104 has afiber receiving section111 that receivesoptical fiber103. In general, reducing length ofsection100 and subsections thereof is desirable in various embodiments.
• In one embodiment, themarker band102 may be adhered to thetorque wire101. In one embodiment, themarker band102 may be spaced away from thetorque wire101 by agap110. In other embodiments, themarker band102 may touch thetorque wire101 such as being welded thereto. In this embodiment, theouter diameter108 of theimaging core assembly100 is reduced compared embodiment with markers on top of torque wire resulting in reduced NURD. Thestiff section107 of theimaging core assembly100—that includes themarker band102 and moldedlens104—is moved away from the end of thetorque wire101. The overlap ofband102 andlens104 reduces overall length of stiff section.
• In some embodiments, thetorque wire101 and themarker band102 may be adhered using a glue material. In other embodiments, thetorque wire101 and themarker band102 may be adhered using any suitable material such as, but not limited to welds, adhesives, compression fit, shrink fit materials, PET, nylon, and others. In one embodiment, the material that attaches or adheres themarker band102 andtorque wire101 together serves as a flexible junction between thetorque wire101 and themarker band102, thus thestiff section107 is minimized and subsequently the NURD is minimized.
• In other embodiments, themarker band102 may be welded or soldered to thetorque wire101. In one embodiment, themarker band102 may be welded to thetorque wire101. Thetorque wire101 may include a bevel or L-grind. As shown, inFIG. 3 the L-grind can be viewed as a shell or object formed by rotating an L around an axis parallel to the vertical longer edge of the “L.” An L grind has a step such that the outer diameter of the torque wire steps in and drops to a lower outer diameter. The length of the section having the smaller outer diameter corresponds to the length of the vertical portion of the “L” with the horizontal portion of the “L” corresponding to the step in distance from the longer unground outer diameter of the “L.”
• In one embodiment, the location of the weld is selected as a means of aligning thetorque wire101 relative to other probe components. In one embodiment, a hinge or joint is used to connect one or more components arranged along the cylindrical axis of the optical fiber and torque wire as shown such that when the torque wire rotates the hinge or joint flexes such that the elements in the probe are aligned and/or rotationally balanced. This can occur as the hinge or join spins up and reaches a stable rotational state that pulls other components of the probe into a balanced rotational configuration.
• At the center of theimaging core assembly100 is a moldedlens104, which is bonded to anoptic fiber103. The bondedoptic fiber103 and moldedlens104 is slid into thetorque wire101. In some embodiment thetorque wire101 slidably receives theoptic fiber103. The fiber and torque can be attached or fixed through various compounds and configurations. The moldedlens104 is attached to theoptical fiber103 by an optical adhesive or other attachment mechanism.
• Theimaging core assembly100 further includes anouter tube105. In some embodiments, theouter tube105 includes Polyethylene terephthalate (PET). The outer tube can be fabricated to have walls of varying thickness. In other embodiments, theouter tube105 includes any suitable material, such as, but not limited to nylon, PET, co-extruder materials, jackets, bi-layer materials, tri-layer materials, silicone, siloxane-based materials, resins, and other materials suitable for use in medical devices and for in vivo applications. The outer tube can be replaced by a coating or cover in some embodiments. In one embodiment, the outer tube is disposed such that it straddles or otherwise covers a weld such as a butt weld or butt joint used to attach the torque wire and the marker band.
• In some embodiments, the moldedlens104 with anoptic fiber103 bonded to it may be encased in a glue106. In some embodiments, the glue106 may be an UV-cured adhesive. In other embodiments, the glue106 includes any suitable material, such as, but not limited to optical potting materials and other glues, resins or suitable adhesives. Shrink wrap assemblies and heat curable compounds can also be used to adhere or otherwise bond components described and depicted connected to or attached to each other throughout the disclosure.
• Theouter tube105 may be used as a mold for the glue106 for the moldedlens104. In some embodiments, the glue106 is wicked into theouter tube105, and then cured. Once cured, the end of the potting glue106 may be cut to a desired length, or it may be left as it is. In some embodiments, theouter tube105 that served as the mold for the glue106 may be left on. In other embodiments, theouter tube105 may be removed.
• Theouter diameter108 of theimaging core assembly100 is less than theouter diameter308 of an imaging core assembly that includes amarker band102 that are on the outside of thetorque wire101. In one embodiment,marker band102 is a dual marker band.
• FIG. 2 depicts one embodiment of theimaging core assembly200 with atorque wire201 that includes abeveled end207. Thisbevel end207 can be formed by an angle w. Theimaging core assembly200 includes amarker band202 connected to atorque wire201. Themarker band202 is configured on theinner diameter209 of theimaging core assembly200 in order to minimize NURD. Theimaging core assembly200 includes anoptical fiber203 bonded to a moldedlens204. In one embodiment, the moldedlens204 sits partially in themarker band202, with the area of interest being outside of themarker band202 to allow for imaging. In other embodiments, there is space between themarker band202 and the moldedlens204.
• In one embodiment, theimaging core assembly200 includes anouter tube205. In some embodiments, theouter tube205 includes a thin-walled PET. In other embodiments, theouter tube205 includes any suitable material, such as, but not limited to nylon, PET, co-extruder materials, jackets, bi-layer materials, tri-layer materials, silicone, siloxane-based materials, resins, and other materials suitable for use in medical devices and for in vivo applications. Theouter tube205 may be used as a mold for thepotting glue206 for the moldedlens204. In some embodiments, theglue206 may be an UV-cured adhesive.
• In other embodiments, theglue206 includes any suitable material, such as, but not limited to lens potting material, heat curable materials, polymers, resins and other suitable adhesives and bonding compounds. In some embodiments, thepotting glue206 is wicked into theouter tube205, and then cured. Once cured, the end of thepotting glue206 may be cut to a desired length, or it may be left as it is. In some embodiments, theouter tube205 that served as the mold for thepotting glue206 may be left on. In other embodiments, theouter tube205 may be removed. Typically, in various embodiments, theouter tube205 is the same as thejacket112.
• In the embodiment ofFIG. 2, thestiff section210 andouter diameter208 of theimaging core assembly200 is minimized. In one embodiment, the outer diameter corresponds to thejacket112 which extends over the lens and marker band and part of thetorque wire207. The minimization of these two features serves to reduce NURD caused by tight environments in the lumen due to either tight lesions or tortuous anatomy. In this embodiment of theimaging core assembly200, the angularity ofimaging core assembly200 relative to the catheter is closer to zero, thereby reducing NURD.
• FIG. 3A illustrates animaging core assembly300 that includes atorque wire301 with L-grind detail308. Theimaging core assembly300 includes amarker band302 joined or otherwise connected to atorque wire301. In various embodiments, the torque wire and the marker band are joined by a weld or other mechanism to form a joint. Themarker band302 is configured on theinner diameter309 of theimaging core assembly300 in order to minimize NURD. Theimaging core assembly300 includes anoptic fiber303 bonded to a moldedlens304. In one embodiment, themarker band302 is welded307 to thetorque wire301. This can be accomplished using a butt weld also referred to as a butt joint. In other embodiments, themarker band302 and thetorque wire201 are connected by other means, such as, but not limited to, an adhesive material, welds, splices, joints, hinges, compression fit, internal couplers and linkages, and other devices and compounds.
• Theimaging core assembly300 includes anouter tube305. This may correspond tojacket112 in various embodiments. In some embodiments, theouter tube305 includes a thin-walled PET, nylon, silicone or other material. In other embodiments, theouter tube305 includes any suitable material. Theouter tube305 may be used as a mold for thepotting glue306 for the moldedlens304. In some embodiments, thepotting glue306 may be an UV-cured adhesive or other adhesive or bonding compound as described herein or suitable for a given application. In some embodiments, thepotting glue306 is wicked into theouter tube305, and then cured. Once cured, the end of thepotting glue306 may be cut to a desired length, or it may be left as it is. In some embodiments, theouter tube305 that served as the mold for thepotting glue306 may be left on. In other embodiments, theouter tube305 may be removed. Thejacket112 is part of the probe for various embodiments and positioned to overlap with joint between torque wire and marker band.
• In the embodiment ofFIG. 3A, thestiff section310 andouter diameter311 of theimaging core assembly300 is minimized. In one embodiment, thestiff section310 extends to end of L grind on left side of figure. The minimization of these two features serves to reduce NURD caused by tight environments in the lumen due to either tight lesions or tortuous anatomy. In this embodiment of theimaging core assembly300, the angularity ofimaging core assembly300 relative to the catheter is closer to zero, thereby reducing NURD.
• FIG. 3B depicts another embodiment of theimaging core assembly320 with atorque wire311 that includes a joint312 by which it is connected tomarker band313.Jacket312 overlaps joint312. Theimaging core assembly320 and the torque wire can be disposed in adelivery catheter323. The joint312 is typically a butt weld or butt joint. In one embodiment, the joint312 is formed by placing thetorque wire311 and themarker band313 together, whether end to end or one nested inside the other, and welding the two metal components to form a butt weld/butt joint.FIG. 3C shows asimilar embodiment350. Anoptical fiber321 as shown inFIGS. 3C and 31), is disposed in the bore oftorque wire311 and terminates in alens304.Lens304 is a molded or thermo-formed lens in one embodiment. Thelens304 can be secured byadhesive315. Adhesive315 can be an optical potting material in one embodiment. Othersuitable adhesives315 that do not interfere with optical properties oflens304 may be used. Thelens304 can include a channel or trough or bore to receive thefiber312. Thefiber312 ends into the torque wire bore.
• FIG. 3C is a cross-sectional view of a data collectionprobe imaging assembly350 in which a moldedlens304 is shown attached to anoptical fiber321. The imaging assembly include atorque wire311 and weld or joint318 which can be a butt weld. The weld or joint318 can have a width w. Adhesive315 can be disposed withjacket312 as shown. The optical fiber is typically first glued tolens304 as shown inFIG. 3D. This assembly can be slid intomarker band313. Thejacket112 spans theweld318, which can be a butt weld or butt joint betweenmarker band313 andtorque wire311. It is desirable to havejacket112 positioned such that it overlaps the weld or joint318 betweentorque wire311 andmarker band313.
• FIG. 3E is a top view of the data collection probe ofFIG. 3D in which a molded lens is shown attached to an optical fiber. InFIG. 3D, thejacket112 is not present nor are the other elements ofFIG. 3C. The adhesive315 shown inFIGS. 3D and 3E can be applied to attach the optical fiber to the moldedlens304. This can be the same adhesive used as shown inFIG. 3C by whichadditional adhesive315 is disposed injacket312 and relative to themarker band313.
• With regard toFIGS. 3B and 3C, in one embodiment, the torque wire is disposed inside the marker band and the joint312,318 is formed between the marker band and the torque wire. In one embodiment, the torque wire is welded to the marker band and the joint312,318 is formed between the marker band and the torque wire. The joint312 can have an associated with w, which is less than the length of the marker band. Theimaging core assembly320 includes amarker band313 connected to thetorque wire311 through the joint312,318. Similar toFIG. 3A, themarker band313 is configured on theinner diameter319 of theimaging core assembly320 in order to minimize NURD. This inner diameter is that ofjacket112 in various embodiments. Thisjacket112 can be PET tube or other polymer material in various embodiments.
• With regard toFIGS. 3B and 3C, the welding of thetorque wire311 using a butt joint can reduce NURD, which can in turn reduce chatter. Additional details relating to chatter and NURD reduction are discussed herein including with regard toFIGS. 8A and 8B below. In general, the design feature discussed herein reduces NURD to at least below the levels that create a high level of chatter such as shown inFIG. 8A. In some embodiments, the distance x shown inFIG. 3A may be of any variable length. In some embodiments, the distance x ranges from about 0.050 mm to about 2.500 mm.
• FIG. 3C and relatedFIGS. 3D and 3E show another embodiment of theimaging core assembly350 with atorque wire311 that includes a joint318 by which it is connected tomarker band313. The use of thejacket112 and positioning it relative to a butt weld or other joint312 formed relative to torque wire and marker band can also help stabilize probe and reduce NURD. As shown inFIG. 3C, atorque wire311 is butt welded tomarker band313.Jacket112 surrounds the various elements, including a portion of thetorque wire311 which abutsmarker band313. Theweld318 can be a flush weld fromtorque wire311 to the end of themarker band313. Alternatively, the one of the two metal elements can be disposed within the other or the weld can have a width w, which applies in the flush arrangement or if one element id disposed in the other.
• FIG. 4A illustrates animaging core assembly400 that includes atorque wire401 andmarker band402 that are welded405 together. A bevel formed at an angle w shown relative to horizontal axis of fiber and line along bevel (both dotted lines) is shown zoomed in inFIG. 4B. Light or electromagnetic radiation λ is shown propagating in the optical fiber and subsequently exiting the lens. Themarker band402 is configured on theinner diameter408 of theimaging core assembly400 in order to minimize NURD. Theimaging core assembly400 includes anoptic fiber403 bonded to a moldedlens404. In one embodiment, themarker band402 is welded405 to thetorque wire401. In other embodiments, themarker band402 and thetorque wire401 are connected by other means, such as, but not limited to, an adhesive material, welds, splices, joints, hinges, compression fit, internal couplers and linkages, and other devices and compounds.
• In one embodiment, themarker band402 may be welded directly409 to thetorque wire401. In other embodiments, themarker band402 may be spaced away from thetorque wire401 by a gap. Theimaging core assembly400 includes ajacket406 configured around the moldedlens404. In some embodiments, thejacket406 includes a thin-walled PET tube or cover.FIG. 4A shows a bevel angle formed at theweld405 between the marker band and the torque wire. The bevel angle can ranges from about 20 degrees to about 60 degrees in one embodiment.
• In other embodiments, thejacket406 includes any suitable material, such as, but not limited to polymers, PET, silicon, nylon, resins, and other polymer-based materials described herein or otherwise suitable for use as a jacket. Thejacket406 may be used as a mold for the potting glue for the moldedlens404. In some embodiments, the moldedlens404 directs light along a perpendicularlight path407. In other embodiments, the moldedlens404 may direct light along alight path407 at any suitable angle. In some embodiments, thejacket406 may be left on. In other embodiments, thejacket406 may be removed. In one embodiment, the use of the lens with an imaging assembly results in one or more of: improved beam imaging, brighter images, improved resolution of external elastic lamina (EEL) measurements, and improved stent strut resolution.
• In the embodiment ofFIG. 4A, an exemplary stiff section having section length SL is shown. In this embodiment, theouter diameter411 of theimaging core assembly400 is minimized. The minimization of these two features serves to reduce NURD caused by tight environments in the lumen due to either tight lesions or tortuous anatomy. In this embodiment of theimaging core assembly400, the angularity of imaging core assembly relative to the catheter is closer to zero, thereby reducing NURD.
• FIG. 5 is a plot of NURD values (y-axis) versus torque (TW)/catheter number. The diamond (416) shows torque wire (TW) values plotted versus 4 mm values (418), which are shown by squares and 2 mm values (420), which are shown by triangles. The 2 mm and 4 mm values correspond to lens length such as the unitary lens or other lens using the imaging assembly. The torque wire values provide a baseline as there is no lens on a bare torque wire, and thus the effective lens length when just the torque wire is considered is zero.
• As shown inplot415 ofFIG. 5, along the vertical columns (doted vertical lines), which include a torque wire value, a 2 mm lens length value, and a 4 mm lens length value. The 4 mm lens length value is the top point in each column and thus corresponding to the higher NURD values. The 2 mm lens length values are below the 4 mm values and the torque wire points are the lowest point in the column or points that overlap with the 2 mm lens length. Thisplot415 illustrates the benefit of reducing the lens length from 4 mm to 2 mm (and other reduced values) which corresponds to reducing the stiff section length for various probe embodiments. As noted herein, by disposing a portion of the lens length within the marker band, the stiff lens and stiff marker band overlap and thereby from such overlapping the overall stiff section length is reduced. As shown, the length reduction in one or more of the foregoing stiff sections or other section beneficially reduces NURD.
• FIG. 6 is a perspective view of acatheter425 suitable for receiving a probe embodiment as disclosed herein. The catheter is as rapid exchange (RX) catheter in one embodiment. Accordingly, a probe that includes a torque wire, a lens, and a marker band as well as optionally other components can be inserted within thecatheter425 and rotated such that data such as image data can be collected by the rotating imaging assembly. The imaging occurs over a pullback region that tracks the imaging window shown in the middle of thecatheter425. As shown inFIG. 6 and inFIGS. 7A-7C, the catheter includes abraided shaft427 which undergoes a transition through a reducedtransition area430 to animaging window433. Aninput port453 is also present. The imaging window continues until it reaches animproved RX rail435 and thedistal tip437 includes a reduced RX profile. As shown, inFIG. 7B, the catheter includes a proximal shaft, which connects to the window tube, which in turn connects to a distal assembly which is shown inFIG. 7A.
• In one embodiment, the probe is of a singular construction or integral such that its components or subassemblies are all a common material such as a molded polymer or metal. In some embodiment, two or more of the components of a probe or catheter can be different materials or manufactured using different processes and at different points in time. In some embodiments, a data collection probe includes two or more of the following components, a lens, a torque wire, a hinge, a joint, an annular ring or band that includes a radiopaque material, a weld, an adhesive, potting material, a tube, a sheath, a jacket, and an optical fiber.
• As discussed herein, the disclosure is directed to improving upon various imaging and data collection probe designs. In particular, various embodiments were designed to mitigate the effect of NURD and other phenomena associated with it. Chatter is one such related undesirable effect. Chatter occurs as a result of high levels of NURD. Specifically, chatter occurs when an image frame displays more or less than 360 degrees of rotation. For example, a chatter frame may only have 300 degrees of rotation or it could have 400 degrees of rotation, both of which are undesirable. In part, the use of various joints, joins, welds, and the selection of stiff sections and the lengths associated therewith help reduce chatter and NURD in various embodiments.
• Chatter occurs when NURD reaches high levels such that the catheter does not rotate 360 degrees in every frame. Therefore, chatter is an extreme case of NURD. Chatter may be measured by how many degrees are displayed in a frame. For example, the greater deviation from 360 degrees, the worse the chatter. On such a scale, a one level of chatter may be distinguished from a one level of chatter. For example, for one image, one level of chatter may be in the range of ±10 degrees from 360 degrees of rotation and a second level of chatter may be any value greater than that.
• FIG. 8A illustrates a series of frames (frame A to frame J) obtained using an OCT imaging probe and an OCT imaging system. The OCT probe was used in an experimental environment designed to permit rotation and imaging by the probe. A frame-by-frame progression of chatter when there is a first level of chatter is shown in the images from the rotating probe. As seen in frames A-J, the first level of chatter significantly distorts the resulting image and is undesirable.FIG. 8B illustrates a frame-by-frame progression of a probe that includes the stiffness section length reduction. The image frames inFIG. 8B, also are for a probe with butt weld in which the jacket spans the weld. As seen in frames F1-F7, the distortion is less than the first level of chatter shown inFIG. 8A. In light of this, the design improvements discussed herein show benefits in terms of reduce chatter and thus reducing NURD.
• More generally, as used herein, the term unitary construction or unitary encompasses embodiments that are of a singular construction as well as embodiments in two parts of combined to form an assembly or combination. As noted above, in other embodiments, the term “unitary” can also refer to an object that is a single piece. For example, an object formed from a single injection molding, e.g., without assembly or addition of further parts can be described as unitary or having a unitary structure.
• Although the preceding and following text sets forth a detailed description of different embodiments of the disclosure, it should be understood that the legal scope of the disclosure is defined by the words of the claims set forth at the end of this patent. The detailed description is to be construed as exemplary only and does not describe every possible embodiment of the invention since describing every possible embodiment would be impractical, if not impossible. Numerous alternative embodiments could be implemented, using either current technology or technology developed after the filing date of this patent, which would still fall within the scope of the claims defining the invention.
• The aspects, embodiments, features, and examples of the disclosure are to be considered illustrative in all respects and are not intended to limit the disclosure, the scope of which is defined only by the claims. Other embodiments, modifications, and usages will be apparent to those skilled in the art without departing from the spirit and scope of the claimed invention.
• The use of headings and sections in the application is not meant to limit the disclosure; each section can apply to any aspect, embodiment, or feature of the disclosure.
• Throughout the application, where compositions are described as having, including, or comprising specific components, or where processes are described as having, including or comprising specific process steps, it is contemplated that compositions of the present teachings also consist essentially of, or consist of, the recited components, and that the processes of the present teachings also consist essentially of, or consist of, the recited process steps.
• In the application, where an element or component is said to be included in and/or selected from a list of recited elements or components, it should be understood that the element or component can be any one of the recited elements or components and can be selected from a group consisting of two or more of the recited elements or components. Further, it should be understood that elements and/or features of a composition, an apparatus, or a method described herein can be combined in a variety of ways without departing from the spirit and scope of the present teachings, whether explicit or implicit herein.
• The use of the terms “include,” “includes,” “including,” “have,” “has,” or “having” should be generally understood as open-ended and non-limiting unless specifically stated otherwise.
• The use of the singular herein includes the plural (and vice versa) unless specifically stated otherwise. Moreover, the singular forms “a,” “an,” and “the” include plural forms unless the context clearly dictates otherwise. In addition, where the use of the terms “about” or “approximately” are before a quantitative value, the present teachings also include the specific quantitative value itself, unless specifically stated otherwise. As used herein, the term “about” refers to a ±10% variation from the nominal value. As used herein, the term “approximately” refers to a ±10% variation from the nominal value. As used herein, the term “substantially” refers to a ±10% variation from the nominal value.
• It should be understood that the order of steps or order for performing certain actions is immaterial so long as the present teachings remain operable. Moreover, two or more steps or actions may be conducted simultaneously.
• Where a range or list of values is provided, each intervening value between the upper and lower limits of that range or list of values is individually contemplated and is encompassed within the invention as if each value were specifically enumerated herein. In addition, smaller ranges between and including the upper and lower limits of a given range are contemplated and encompassed within the invention. The listing of exemplary values or ranges is not a disclaimer of other values or ranges between and including the upper and lower limits of a given range.

Claims (22)

What is claimed is:

1. An intravascular data collection probe comprising:

a marker band defining a bore, an outer surface, a first end and a second end, the marker band having a band length, the marker band comprising a radiopaque material;

a lens defining a beam directing surface, the lens partially disposed in the bore, wherein the beam directing surface extends past the second end;

an optical fiber disposed in the marker band, wherein a section of the optical fiber extends from the first end of the marker band, the optical fiber optically coupled to the lens.

2. The probe ofclaim 1 further comprising a jacket defining a jacket bore, wherein the marker band, the lens, and a section of the optical fiber are disposed in the jacket bore.

3. The probe ofclaim 1 further comprising a torque wire defining a torque wire bore and a torque wire end face, wherein the optical fiber extending from the marker band is disposed in the torque wire bore, wherein the first end of the marker band is joined to the torque wire end face.

4. The probe ofclaim 3 wherein the marker band is joined to the torque wire end face by a butt weld.

5. The probe ofclaim 3 further comprising a jacket defining a jacket bore, wherein the marker band, the lens, and a section of the optical fiber are disposed in the jacket bore.

6. The probe ofclaim 5 wherein the first end of the marker band and the torque wire end face are disposed in the jacket bore.

7. The probe ofclaim 3 wherein the torque wire end face defines a bevel oriented at a bevel angle relative to a longitudinal axis of the torque wire bore, wherein the end face is welded to the first end of the marker band.

8. The probe ofclaim 2 wherein lens is a molded unitary lens defining an elongate optical fiber receiving section having a fiber section length and a beam directing surface.

9. The probe ofclaim 8, wherein a first section of the optical fiber is disposed in the optical fiber receiving section, wherein a portion of the first section of the optical fiber is disposed within the marker band bore.

10. The probe ofclaim 3 wherein the torque wire defines a first outer diameter at the first endface and a second outer diameter at the second endface, wherein the second outer diameter is less than the first outer diameter.

11. The probe ofclaim 10 wherein the second outer diameter spans a distance from the second end face until the second outer diameter reaches a step up to the first outer diameter.

12. The probe ofclaim 10 wherein a portion of the second end of the torque wire that defines the second diameter is disposed within the bore of the marker band.

13. The probe ofclaim 7 wherein the bevel angle ranges from about 20 degrees to about 60 degrees.

14. The probe ofclaim 3 wherein torque wire has a first stiffness, wherein marker band has a second stiffness greater than the first stiffness, wherein sum of length of marker band and length of lens extending from marker band defines a stiffness section.

15. The probe ofclaim 14 wherein the length of the stiffness section ranges from about 2 mm to about 3 mm.

16. The probe ofclaim 4 wherein the probe is configured to reduce chatter when rotating the probe and collecting image data.

17. The probe ofclaim 1 further comprising a coating, the coating is disposed on or relative to the lens such that the lens and the coating define a compound lens system.

18. The probe ofclaim 1 wherein the marker band is substantially cylindrical.

19. The probe ofclaim 3 wherein the torque wire is connected to the marker band by a joint substantially in a single plane.

20. The probe ofclaim 4 wherein lens is a molded unitary lens defining an elongate optical fiber receiving section having a fiber section length and a beam directing surface.

21. The probe ofclaim 3, wherein marker band and torque wire are joined by a flexible junction.

22. The probe ofclaim 8 wherein the fiber section length and the band length overlap.

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