MEDICAL DEVICE WITH OLED ILLUMINATION LIGHT SOURCE

Abstract

A medical device such as a catheter or endoscope device includes an illumination light source having one or more organic light-emitting diodes (OLEDs). The OLEDs are energized to produce illumination light that is received by an image sensor or camera to produce images of tissue within a patient's body. A heat conductive polymer conducts heat away from the illumination light source.

Claims

1-7. (canceled)

8. A medical illumination device comprising: a tubular member extending from a proximal end to a distal end; an imaging device located on a distally-facing surface of the distal end; a substrate; a first electrode located on the substrate; and a first LED, wherein the first LED extends circumferentially about an outer surface of the tubular member.

9. The medical illumination device of claim 8, wherein the first electrode extends circumferentially about the outer surface of the tubular member.

10. The medical illumination device of claim 8, further comprising a second electrode that extends circumferentially about the outer surface of the tubular member, wherein the first LED is located between the first electrode and the second electrode.

11. The medical illumination device of claim 8, further comprising a second LED that extends circumferentially about the outer surface of the tubular member.

12. The medical illumination device of claim 11, wherein the first LED and the second LED are spaced apart from one another along a length of the tubular member.

13. The medical illumination device of claim 8, wherein the first LED is one of a plurality of LEDs, and wherein each of the plurality of LEDs is configured to produce a first wavelength of light.

14. The medical illumination device of claim 8, further comprising a second LED that extends circumferentially about the outer surface of the tubular member; and wherein the first LED is configured to produce a first light having a first wavelength, and the second LED is configured to produce a second light having a second wavelength, different than the first wavelength.

15. The medical illumination device of claim 8, further comprising a heat conductive polymer that is thermally coupled to the first LED.

16. The medical illumination device of claim 8, wherein the first LED is one of a plurality of LEDs, and wherein the tubular member defines a lumen extending through each of the plurality of LEDs.

17. A medical illumination device comprising: a tubular member having a proximal end and a distal end, wherein the distal end is dimensioned for insertion into a body cavity; an image sensor located at and facing distally relative to the distal end; a first electrode located at a distal region of the tubular member; and a first LED located between the proximal end and the distal end, radially facing outward, and positioned along a circumference of the tubular member; wherein the tubular member defines one or more lumens extending through the first LED.

18. The medical illumination device of claim 17, further comprising a heat conductive polymer that is thermally coupled to the first LED.

19. The medical illumination device of claim 17, wherein the first LED encircles an outer surface of the tubular member, such that the first LED includes a length equal to the circumference of the tubular member.

20. The medical illumination device of claim 17, wherein the first LED is one of a plurality of LEDs, wherein each of the plurality of LEDs is organic and produces light of a first wavelength.

21. The medical illumination device of claim 17, further comprising a second LED facing radially outward and positioned along the circumference of the tubular member, wherein the first LED is configured to produce a first light of a first wavelength, and the second LED is configured to produce a second light of a second wavelength, different than the first wavelength.

22. A medical illumination device comprising: a tubular member having a proximal end and a distal end, wherein the distal end is dimensioned for insertion into a body cavity; an image sensor located on the distal end and facing a first direction, wherein the image sensor is configured to capture images of the body cavity; and a first LED located on an outer surface of the tubular member and facing a second direction that is transverse relative to the first direction, wherein the first LED extends distally of a first electrode on the tubular member.

23. The medical illumination device of claim 22, further comprising a heat conductive polymer that is thermally coupled to the first LED.

24. The medical illumination device of claim 22, wherein the first LED encircles a length of an outer surface of the tubular member.

25. The medical illumination device of claim 22, wherein the tubular member defines a lumen extending through the first LED and parallel to the first direction.

26. The medical illumination device of claim 22, further comprising a second electrode, wherein the second electrode is positioned distal to the first electrode, and the first LED extends between the first electrode and the second electrode.

27. The medical illumination device of claim 26, further comprising a second LED spaced apart from the first LED and facing the second direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The foregoing aspects and many of the attendant advantages of this invention will become more readily appreciated as the same become better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:

[0010] FIG. 1 shows a medical device such as an endoscope having a single OLED light source at or adjacent its distal end in accordance with one embodiment of the present invention;

[0011] FIG. 2 illustrates a medical device having a light source comprising a number of OLEDs;

[0012] FIG. 3 shows components of an in-vivo medical imaging system, including an OLED light source in accordance with the present invention; and

[0013] FIG. 4 shows a medical device including a strip of OLED material that can be used to gauge depth of insertion into a patient in accordance with another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] As indicated above, the present invention is an in-vivo medical device that uses organic light-emitting diodes (OLEDs) as a light source to provide illumination light within a patient's body cavity. FIG. 1 shows the distal end of an in-vivo medical device 10 such as a catheter, endoscope, bronchoscope, trocar, guidewire or other device that is inserted into a patient's body cavity. At or adjacent the distal end of the device is the light source 12 having one or more organic light-emitting diodes that produce illumination light when energized.

[0015] The light source 12 has a substrate 14 on which is formed an electrode 16. A semi-transparent electrode 18 is formed on top of the organic light-emitting diode material such that the diode material is sandwiched between the electrodes 16 and 18. Electrode wires, conductive leads, or other current carrying devices 28 connect the electrodes 16 and 18 to a power supply 30, which is typically external. However, the medical device could have built-in batteries to power the light source. The application of electrical energy to the electrodes 16 and 18 cause the organic light-emitting diode material to produce illumination light. The composition and method of constructing an OLED light source 12 suitable for use with the medical device of the present invention are known to those of ordinary skill in the art of light-emitting diodes. See, for example, U.S. Pat. Nos. 6,627,333; 6,124,046; 6,127,693; and 6,495,198, which are herein incorporated by reference.

[0016] In the embodiment shown, the light source 12 is generally cylindrical or tubular in shape such that the medical device 10 can include one or more parallel or coaxial lumens 22 extending through the light source 12. In addition, the medical device 10 may include an image sensor 24 at or adjacent its distal end for capturing images of a patient. Alternatively, the medical device 10 may include an imaging light guide and one or more lenses that direct reflected and back scattered illumination light to an external image sensor or camera.

[0017] The illumination light provided by the light source 12 may be in the visible, ultraviolet or infrared spectrum depending upon the desired use of the medical device 10.

[0018] FIG. 2 illustrates another embodiment of a medical device 50 having an OLED light source 52 at or adjacent its distal end. The light source 52 includes a substrate 54 and a number of spaced, semi-transparent electrodes 56, 58, 60, 62. Between the electrodes are segments of organic light-emitting diode material of different colors or wavelengths in order to form a stacked organic light-emitting diode (SOLED). The color or illumination wavelength of the light induced by the light source 52 can be adjusted by applying a voltage to selected electrodes 56, 58, 60 or 62. The SOLED can be manufactured with known lithographic or semiconductor fabrication techniques such as those described in Patent Application No. PCT/US98/01412, which is herein incorporated by reference.

[0019] In the embodiment shown in FIG. 2, the light source 52 has an ovoidal shape with an atraumatic distal tip to reduce the likelihood of damaging tissue in the body. The medical device 50 also has one or more lumens 70 exiting the distal end of the device and an imaging sensor 72 for producing images of the patient.

[0020] FIG. 3 shows an in-vivo medical imaging system including a medical device 100 having a light source 102 formed of one or more OLEDs that provide illumination light to a point of interest in a patient's body. At the proximal end of the medical device 100 are the proximal openings of one or more lumens within the medical device 100, through which a physician can insert an instrument into the patient. In addition, the proximal end of the medical device includes a connector 109 that connects the light source 102 to a supply of electrical power 110. A connector 108 allows signals from an imaging sensor (not shown) at the distal end of the device to be connected to a video or other display 112.

[0021] In operation, the physician can adjust the supply of electrical power 110 to the one or more OLEDs at the distal end of the medical device 100 in order to adjust the intensity or illumination wavelength of the light produced. In some instances, the power supply 110 may be automatically controlled to illuminate the tissue with a number of different wavelengths such that images can be obtained with illumination light of each wavelength in order to view tissue under a variety of illumination conditions. Alternatively, the light source may be strobed to obtain images of moving tissue such as heart valves, etc.

[0022] Depending on the wavelength of the illumination light, different imaging techniques may be used to view or diagnose tissue in the body. These imaging techniques include: drug induced or native fluorescence imaging and white light or colored light imaging. In addition, light from the light source can be used to activate photosensitive drugs, or infrared heat can be supplied to tissue in the body.

[0023] FIG. 4 illustrates an embodiment of the invention whereby a medical device 120 has one or more strips of OLED material 122 positioned along its length. The strips 122 are preferably ruled or otherwise marked with distance indications. The one or more strips 122 can therefore be used to gauge how far the device 120 is inserted into a patient. The strip 122 may be integrally formed on the medical device 120 or may be separately formed by a semiconductor or lithographic process and secured to the device 120 with an adhesive or the like.

[0024] In the embodiments shown in FIGS. 1-4, it may be desirable to encapsulate the OLED light source with a transparent cover or shield to prevent bodily fluids from contacting the light source.

[0025] As will be appreciated, the OLEDs generate more light in a smaller area and with less heat than that produced by conventional LEDs. The light produced may be sufficient to externally view the position of the illuminated medical device inside the body with the naked eye or with external imaging equipment.

[0026] In some instances, it may be desirable to provide a mechanism for removing heat from the one or more OLEDs and transferring the heat to a point away from the patient's body. In one embodiment of the invention, the medical device includes a heat conducting polymer such as that described in U.S. Pat. No. 6,620,497 assigned to Cool Options, Inc. of Warwick, R.I., and which is herein incorporated by reference. A head conductive polymer as described in the '497 patent can be used to form the tubular walls of the medical device or a cover of the medical device. Alternatively, the medical device can include a strip of such a heat conductive polymer material having one end thermally coupled to the OLEDs and another end positioned away from the OLEDs. The strip therefore conducts the heat produced by the OLEDs away from the patient. The heat can be transferred outside of the patient's body or over a large enough area such that no point of the medical device that is within the patient becomes hot enough to cause discomfort or burn the patient.

[0027] Furthermore, the OLED endoscope may include a torqueable pull wire such as disclosed in U.S. Pat. No. 5,642,736, which is herein incorporated by reference, in order to provide the ability of an operator to bend the distal tip and to rotate it by torquing the wire or rotating it about its longitudinal axis.

[0028] While the preferred embodiment of the invention has been illustrated and described, it will be appreciated that various changes can be made therein without departing from the scope of the invention. For example, although the invention has been illustrated with endoscopes, it will be appreciated that other medical devices such as guide catheters, guidewires, ablation devices, balloon catheters or other devices could be equipped with such a light source. It is therefore intended that the scope of the invention be determined from the following claims and equivalents thereof.