Identifying and treating lung tissue abnormalities presents challenges that are somewhat unique to the lungs. If a tissue lesion or tumor is to be identified and excised surgically, the chest wall must be opened to provide access to the lungs. Opening the chest wall is a common procedure but one that presents risks of infection and lengthy recovery time, nonetheless. If a tissue lesion or tumor is to be identified endoscopically, the complicated bronchial maze must be navigated.
Bronchoscopes are small cameras attached to the end of a navigable probe and are useful in navigating the airways. The live, illuminated images provide the physician a direct look at the inside surfaces of the airways; however, these bronchoscopes have some inherent shortcomings. First, their present size limits how far into the airways they can be navigated. The airways decrease in diameter as the alveoli are approached. Second, the lungs are a moist environment and can cause the camera lens to become obscured with moisture. Similarly, if a tissue procedure, such as a biopsy, is performed in an airway that can accommodate an endoscope and a cutting tool, there is a chance that blood, mucous, or tissue may land on the lens and obscure the physician's view.
To address the first shortcoming, technology has been developed that allows a physician to track, in real-time, the position of a probe (hereinafter “locatable guide” or “LG”) traveling through the airways. This technology incorporates a plurality of coils at the end of an LG and a magnetic field generator outside of the patient. The patient is placed in the magnetic field created by the generator. As the LG is navigated through the airways, electrical current is induced in the coils and sent via conductors to a computer. The computer can calculate the position and orientation of the probe based on the relative strengths of the current being induced. This technology is shown and described in greater detail in U.S. Pat. Nos. 7,233,820 6,226,543, 6,188,355, 6,380,732, 6,593,884, 6,711,429, 6,558,333, 6,887,236, 6,615,155, 6,574,498, 6,947,788, 6,996,430, 6,702,780, and 6,833,814; and U.S. Patent Publications 20050171508, 20030074011, 20020193686, each of which is incorporated by reference herein in its entirety and also PCT application WO 03/086498 titled ‘Endoscope Structure and Techniques for Navigation in Brunched Structure’ to Gilboa, fully incorporated herein by reference.
These references describe a method and apparatus in which a thin locatable guide, enveloped by a sheath, is used to navigate a bronchoscopic tool to a target location within the lung, aimed in particular to deliver treatments to the lung periphery beyond the bronchoscope's own reach. The coordinates of the target are predetermined based upon three-dimensional CT data. A location sensor is incorporated at the locatable guide's tip. The enveloped guide is inserted into the lung via the working channel of a bronchoscope. First, the bronchoscope's tip is directed to the furthest reachable location in the direction of the target. Next, the guide is advanced beyond the tip of the bronchoscope towards the designated target, based on the combination of the CT data and the position of the guide's tip as measured in body coordinates. When the guide's tip is at the target, the guide is withdrawn, freeing the sheath for insertion of a bronchoscopic tool. In order to prevent the distal end portion of the sheath from sliding away from the target, the sheath is locked to the bronchoscope's body and the bronchoscope itself is held steadily to prevent it from slipping further into the lungs or outwards. Because the airways in the periphery of the lung are narrow, approximately in the same dimensions as the sheath, sideways movements are extremely limited.
The above system and apparatus are aimed to navigate standard bronchoscopic tools to a target located in the lung. In its basic operation, first the target is identified in the CT data, then the guide is navigated to the target and a medical treatment is delivered. It would be advantageous, however, to perform more sophisticated treatments, such as by combining different types of treatments into a single session. Because these locatable guides are smaller than endoscopes, they can travel deeper into the airways. Additionally, rather than relying on visible landmarks and the physician's knowledge of the anatomy of the airways, the position of the LG is superimposed on a computer rendering or x-ray image of the lungs, thereby increasing the navigation value of the sensor. Advantage may be taken of both technologies by placing a probe within a working channel of the endoscope. Thus, real-time images may be viewed while navigating the endoscope as far into the airways as its size allows. Then, the LG is advanced out of the distal end of the working channel of the bronchoscope and deeper into the airways. The LG is surrounded by a sheath. In some embodiments the sheath is steerable and in others, the LG itself is steerable.
Once the LG has been navigated to a target area, presently the LG is retracted through the sheath, while the sheath is left in place. The sheath is referred to as an “extended working channel” (“EWC”) because it is effectively an extension of the working channel of the bronchoscope. The EWC is then used as an avenue for inserting working tools to the target site. Such tools include biopsy needles, ablation devices, etc. After the LG is removed from the EWC, the physician is operating blind, relying on the EWC to remain fixed at the target site. If a tool, such as an aspiration needle or an ablation tool, is being used that requires repositioning in order to treat a greater target area, the repositioning must be done without guidance.
There is a need for an apparatus that allows a physician to operate on a target site endoscopically, while benefiting from the concurrent use of a bronchoscope, an LG, or both. There is a further need for an endoscopic tool that has the capability of maintaining a clear lens during a procedure in a moist environment.
The present invention represents a step forward in endoscopic procedures by providing an endoscopic tool that is capable of being inserted into narrow passageways and performing procedures once a target has been reached. Preferably the instrument of the present invention is insertable through the working channel of a standard bronchoscope.
More specifically, the present invention is a catheter designed to be extended out of the distal end of the working channel of a bronchoscope. The catheter includes a micro-camera with a means for cleaning the lens thereof in situ. Additionally, the catheter includes a location sensor capable of either transmitting a location signal or detecting location fields such that location and orientation data may be provided to the practitioner.
Additionally, the catheter of the present invention includes one or more miniature working channels capable of receiving diagnostic and therapeutic tools and catheters, such as biopsy or ablation tools and catheters. Other examples of diagnostic and therapeutic tools for use with the device of the present invention include various needles, forceps, guide catheters, cyrocatheters, needle aspiration catheters, modified atherectomy devices, just to name a few. The combination of the camera, the miniature working channel, and the sensor, provides the practitioner with a real-time view of the tissue being manipulated during the procedure. The practitioner also has an unprecedented degree of confidence that the tissue being manipulated is the targeted tissue.
One aspect of the present invention uses the devices of the present invention for applications such as integrated in situ diagnostic techniques (AF, ULS, OCT, etc.), delivering pre-therapy tools to direct subsequent therapeutic procedures such as markers to guide radiosurgery or inject dye to direct VATS procedures, therapeutic delivery such as LDR brachy seeds or site-specific drug delivery.
Referring now to
Location System 100
The location system 100, shown in
The sensor assembly 120 may be passive or active. A system using a passive sensor assembly 120 is shown in
In one embodiment, shown in
Preferably, the sensor elements 122, 124 and 126 are arranged in the locatable guide 120 such that the sensor elements 122a and 122b are on opposite sides of, and equidistant from, a common reference point 128. Similarly, sensor elements 124a and 124b are on opposite sides of, and equidistant from, point 128, and sensor elements 126a and 126b also are on opposite sides of, and equidistant from, point 128. In the illustrated example, the sensors 122, 124 and 126 are disposed collinearly along a longitudinal axis 130 of the sensor assembly 120, but other configurations are possible.
For example,
Referring again to
Antenna 142 is skewed in a y direction in that the loops on one side of the antenna 142 are closer together than the loops on the opposite side. Hence, antenna 142 creates a magnetic field that is stronger on the side where the loops are close together than it is on the opposite side. By measuring the strength of the current induced by the antenna 142 in the sensor assembly 120, it can be determined where the sensor assembly 120 is located in a y direction over the antenna 142.
Antenna 144 is similarly skewed but in an x direction. Hence, the antenna 144 also creates a magnetic field that is stronger on the side where the loops are closer together than it is on the opposite side. By measuring the strength of the current induced by the antenna 144 in the sensor assembly 120, it can be determined where the sensor assembly 120 is located in an x direction over the antenna 144.
Antenna 146 is not skewed. Rather, it creates a uniform field that naturally diminishes in strength in a vertical direction when the location board is horizontal. By measuring the strength of the field induced in the sensor assembly 120, it can be determined how far the locatable guide is located above the antenna 146.
In order to distinguish one magnetic field from another, the fields of each antenna 142, 144 and 146 are generated using independent frequencies. For example, antenna 142 might be supplied with alternating current oscillating at 2.5 kHz, antenna 144 might be supplied with alternating current oscillating at 3.0 kHz, and antenna 146 might be supplied with alternating current oscillating at 3.5 kHz. Hence, each of the field sensors 122, 124, and 126 of the locatable guide will have three different alternating current signals induced in its coils.
Driving circuitry 148 includes appropriate signal generators and amplifiers for driving each of the loop antennas 142, 144 and 146 at their corresponding frequencies. The electromagnetic waves generated by the location board 140 are received by the sensor assembly 120 and converted into electrical signals that are then sent to the control system 180, shown diagrammatically in
The control system 180 generally includes reception circuitry 182 that has appropriate amplifiers and A/D converters. The reception circuitry 182 and the driving circuitry 148, which may be considered part of the control system 180, are controlled by a controller/processor 184 that typically is an appropriately programmed computer. The controller/processor 184 directs the generation of transmitted signals by driving circuitry 148.
A location system 100 using an active sensor assembly 120 is shown and described in U.S. Pat. No. 6,188,355 to Gilboa, entitled Wireless Six-Degree-of-Freedom Locator. The entirety of the patent is incorporated by reference herein. The principles of operation are similar to the operation of the passive sensor assembly system except that electrical current is sent to the sensor assembly 120, such that magnetic fields are generated thereby. These magnetic fields are then detected by other sensors and that information is used to determine a location of the probe in which the sensor assembly 120 is located.
Optic System 200
Referring to
If, however, a wide-angle view is desired, there may be utility in providing a convex optic window 240 that protrudes from the distal tip 30 of the catheter 10. This may allow the lens 210 to be closer to, or beyond the distal tip 30 of the catheter body.
The objective lens 210 may be borrowed from existing technology such as a CMOS, fiberscope or a microvideo system. The lens 210 may also be a hybrid between fiberscope and video technology, such as that found on the Olympus BF type XP160F, also marketed as the Evis Exera Bronchofibervideoscope (hereinafter “Olympus scope”).
The Olympus scope includes a 1.2 mm working channel for a tool but, unlike the present invention, does not have an optical cleaning system, does not have a location system, and does not fit within a 2.65 mm working channel. The Olympus scope has an outside diameter of 2.8 mm.
Nevertheless, the lens system of the Olympus scope may have application in the catheter of the present invention. The Olympus scope uses a single, relatively large, light source. The present invention provides a plurality of individual, very small fibers, each acting as light guides 220 to illuminate the target. By providing a plurality of small light sources 220, rather than one larger light source, more space-saving options become available and it is possible to reduce the overall diameter of the catheter 10.
The light fibers 220 terminate at a floor 230 of the optic system 200. A space between the floor 230 and the optic window 240 provides room for additional components 250 and also results in an internal sidewall 260 surrounding the floor 230. In one embodiment, this sidewall includes a reflective material, which acts to maximize the amount of light being transmitted through the optic window 240.
As best seen in
Optic Cleaning System 300
The optic cleaning system 300 is shown generally in
Preferably, the optic cleaning system 300 is fed by a small supply of liquid or gas that is located in a portion of the catheter system 10 that remains outside of the patient, such as the handle. Similarly, locating the valve associated with the actuating system near the supply, as opposed to near the nozzle 310, will reduce the amount of space occupied by the cleaning system 300. If, on the other hand, space along the length of the catheter 10 is in short supply, but there is room for a small reservoir at the tip 30 of the catheter, it is envisioned that a reservoir and valve mechanism be located at the tip 30 and electrically controlled by a small wire running the length of the catheter 10, obviating the need for a supply lumen.
Tool 400
The catheter 10 includes a working channel 20, preferably having an outside diameter of about 1.2 mm, that can accommodate a tool 400. The tool 400 may be any endoscopic tool, such as forceps, graspers, brushes, markers, seeds, ablation tools, and the like. By way of example only, several embodiments of a tool 400 are discussed in greater detail herein.
Referring now to
The example shown in
The flexible tube 420 may be made of any suitable, biocompatible material having a desired amount of flexibility and axial strength. A material selected for the embodiment of
The larger flexible tube 430 of this embodiment is a PEEK tube with an outside diameter of 1.15 mm and extends to the handle of the bronchoscope. The difference in outside diameter of the flexible tube 420 (in this example, 0.9 mm) and the outside diameter of the larger tube 430 (in this example, 1.15 mm) results in the shoulder 440. Hence, in this example, the shoulder 440 has a height of 0.125 mm.
In the extended position of
Needle uses are known in the art and are applicable to the needle 410 of the present invention. For example, the needle tip 410, the flexible tube 420 and the larger flexible tube 430 all have a central lumen which can be made to create one continuous lumen 460 throughout the tool 400. This lumen 460 can be used to apply suction to the tool 400, thereby creating an aspirating needle or a biopsy needle. The lumen 460 can also be used as an irrigation port or a means for injecting substances into the target. Alternatively, as shown in
If the needle 410 is to be used for biopsy purposes, one skilled in the art will realize that it may be desirable to keep the tissue sample contained within a distal section of the needle 410 for easy retrieval of the sample after the procedure. In this case the needle lumen 460 may be larger than a suction lumen 470, as seen in
One embodiment of the present invention uses a needle tip 410 or other suitable delivery device to inject one or more markers into the target site. Markers, such as gold markers, can be used as fiducials in an image-guided radiosurgery treatment during interstitial radiation. The insertion of internal fiducial markers into various organs assists in precise setup and real-time tumor tracking during radiotherapy. Markers may also be used to adjust the center of mass of the target volume to a planned position for an upcoming treatment. The markers are visible on x-ray, CT, MR, or other imaging technique and a device that delivers external beam radiation therapy can use the markers to plan and localize radiation delivery. The detection of fiducial gold markers is useful during automatic on-line megavoltage position verification using a marker extraction kernel (MEK). The markers allow for accurate tumor location three-dimensionally throughout the treatment. Alternatively, it is envisioned that the lumen 460 may be used with a pusher to deliver the markers.
Similarly, the needle 410 can be used to implant seeds for brachytherapy, as one skilled in the art will realize. The added navigation accuracy of the catheter 10 made possible by the combination of the location system 100 and the optic system 200 makes the catheter 10 an ideal vehicle for the precise delivery of brachytherapy seeds.
Positive results have been obtained using a needle 410 that is an NMPE needle with a three-sided Trocar stylet. This particular needle 410 was made with 18-gauge thin-walled tubing and has an echogenically enhanced tip for use in combination with ultrasonically guided implants. The needle 410 also has an outer cannula chamber for smooth transition.
Existing seed implant needles may also be used in combination with the present invention. One example of an existing seed implant needle is the Bard BrachyStar® Needle.
Steering System 500
The steering system 500 may utilize any combination of retractable wires and/or pre-formed bends. One embodiment of a steering mechanism 500 is shown on the catheter tip 30 of
As shown in
Examples of other steering mechanisms that may be used with the catheter 10 of the present invention include, but are not limited to, those discussed in U.S. Pat. No. 6,702,780 to Gilboa et al.
Catheter Design
The catheter body 600 is flexible and carries all of the lumens, steering wires, tools, etc. that are employed by the various tip 30 designs of the present invention. Hence, this section will largely consist of a discussion of the various arrangements envisioned by the present invention. Common to all embodiments, is that the body 600 is preferably sized to fit within the working channel of a typical bronchoscope. Notably, however, the minimum bending radius of the body 600, while inside the working channel of the bronchoscope, is advantageously reduced by a reduced tip 30 length, as shown in
More specifically,
Several examples of different configurations of catheters 10 of the present invention are shown in
The prior art catheter 1 has a tip 2 attached to a flexible, steerable segment 4. The tip 2 is 10.2 mm long and has a diameter that is less than 2.65 mm. However, the location sensor 100 occupies substantially all of the tip 2.
Configuration 700 includes a tip 702 attached to a flexible, steerable segment 704. The tip 702 contains a 19 Ga needle 400, a sensor 100 and two irrigation lumens 490, one for irrigation fluid supply and one for applying suction. The tip 702 is 6.8 mm long and the flexible, steerable segment 704 is constructed of a flexible material such as nylon.
Configuration 710 includes a tip 712 attached to a flexible, steerable segment 714. The tip 712 contains a 1.2 mm working channel, a sensor 100, and two looped steering wires 530. The tip 712 is 6.4 mm long and the flexible, steerable segment 714 is constructed of transparent flexible nylon.
Configuration 720 includes a tip 722 attached to a flexible, steerable segment 724. The tip 722 contains a 1.2 mm working channel, a sensor 100, and four steering wires 530. The tip 722 is 6.4 mm long and the flexible, steerable segment 724 is constructed of transparent flexible nylon.
Configuration 730 includes a tip 732 attached to a flexible, steerable segment 734. The tip 732 contains a 1.2 mm working channel and a sensor 100, and four access ports 525 containing the distal ends of four steering wires 530. The tip 722 is 6.4 mm long and the flexible, steerable segment 724 is constructed of transparent flexible nylon.
Configuration 740 includes a tip 742 attached to a flexible, steerable segment 744. The tip 742 contains a 1.2 mm working channel with a needle 400 contained therein, a sensor 100, and four access ports 525 containing the distal ends of four steering wires 530. The tip 722 is 6.4 mm long and the flexible, steerable segment 724 is constructed of a flexible spring segment.
Configuration 750 includes a tip 752 attached to a flexible, steerable segment 754. The tip 752 contains a 1.2 mm working channel, a sensor 100, four access ports 525 containing the distal ends of four steering wires 530, an irrigation lumen 490, an optic system 200, and an optic cleaning system 300. The tip 752 is 8.5 mm long to accommodate the optic system 200 and the flexible, steerable segment 754 is constructed of a flexible material such as nylon.
Although the invention has been described in terms of particular embodiments and applications, one of ordinary skill in the art, in light of this teaching, can generate additional embodiments and modifications without departing from the spirit of or exceeding the scope of the claimed invention. Accordingly, it is to be understood that the drawings and descriptions herein are proffered by way of example to facilitate comprehension of the invention and should not be construed to limit the scope thereof.
The present application is a continuation application of U.S. patent application Ser. No. 13/474,572, filed May 17, 2012, which is a divisional of U.S. patent application Ser. No. 12/501,330 filed Jul. 10, 2009 entitled Integrated Multi-Functional Endoscopic Tool, which claims benefit of U.S. Provisional Application Ser. No. 61/079,678, filed Jul. 10, 2008 entitled Integrated Multi-Functional Endoscopic Tool; each of which are hereby incorporated herein by reference in their entireties.
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