Capsule type medical device system, and capsule type medical device

• US 7,918,786 B2
• Filed: 11/09/2004
• Issued: 04/05/2011
• Est. Priority Date: 11/11/2003
• Status: Active Grant

• Current Assignee: Olympus Corporation
• Original Assignee: Olympus Corporation
• Inventors: Takizawa, Hironobu, Yokoi, Takeshi, Kawano, Hironao, Uchiyama, Akio, Homan, Masatoshi
• Primary Examiner(s): SMITH, PHILIP ROBERT
• Application Number:
  US10/984,279
• Publication Number:
  US 20050183733A1
• Time in Patent Office: 2,338 Days
• Field of Search: 600103-104, 600116-118
• US Class Current: 600/117
• CPC Class Codes: A61B 1/00156 using self propulsion
• CPC Class Codes: A61B 1/00158 using magnetic field
• CPC Class Codes: A61B 1/041 Capsule endoscopes for imaging
• CPC Class Codes: A61B 5/06 Devices, other than using radiation, for detecting or locating foreign bodies for removing same A61B17/50 ; determining position of probes within or on the body of the patient
• CPC Class Codes: A61B 5/067 using accelerometers or gyroscopes

Abstract

This capsule type medical device system includes: a position detection device 4 which detects the position within the living body of a capsule type medical device 2 which can be ingested to within the living body; an electrode 5 which is provided in the vicinity of the outer surface of the capsule type medical device 2, and which applies an electrical stimulus to living body tissue; and a control device 6 which controls the electric current which flows to the electrode 5; and the control device 6 controls the electric current which flows to the electrode 5 based upon positional information which is detected by the position detection device 4.

Claims

1. A capsule type medical device system which comprises a capsule type medical device which can be ingested to within the living body, further comprising:

a region determination device which determines a bodily region at which the capsule type medical device is located based on referencing information set in advance;

an electrode which is provided on the capsule type medical device, and which applies an electrical stimulus to living body tissue; and

a control device which is provided on the capsule type medical device, and which controls an electric current which flows to the electrode based on information of the bodily region determined by the region determination device;

a second detection device which is provided on the capsule type medical device, and which detects in-vivo information within the living body;

wherein the region determination device determines the bodily region at which the capsule type medical device is located by comparing the in-vivo information detected by the second detection device with the referencing information set in advance;

wherein the second detection device comprises an acquisition device which acquires the in-vivo information;

wherein the region determination device determines an orientation of the capsule type medical device within the body based on the in-vivo information which is acquired by the acquisition device; and

wherein the control device controls the electric current which flows in the electrode based on the orientation of the capsule type medical device.

2. A capsule type medical device system according to claim 1, further comprising:

a storage device which stores the in-vivo information.

3. A capsule type medical device system according to claim 1, further comprising:

an electrical stimulation device which comprises a plurality of the electrodes;

an electrode selection device which selects an electrode from among the plurality of electrodes, to apply an electrical stimulus;

a contact detection device which electrically detects that the electrode is in contact with the living body tissue; and

a control section which controls the electrical stimulation device, electrode selection device, and contact detection device.

4. A capsule type medical device system according to claim 3, wherein

the electrical stimulation device comprises:

one electrodes which are connected to the high electrical potential side, and

the other electrodes which are connected to the low electrical potential side,

the electrode selection device comprises;

a first switching device which selects at least one electrode from among the one electrodes and connects it electrically to a supply source of electrical current; and

a second switching device which selects at least one electrode from among the other electrodes.

5. A capsule type medical device system according to claim 4, wherein the one electrode and the other electrode are each disposed at equal intervals around the outer periphery of a cross section which is roughly orthogonal to an axial line which extends along the longitudinal direction of the casing of the capsule type medical device.

6. A capsule type medical device system according to claim 4, wherein the one electrode and the other electrode are disposed in multiple steps along the outer surface of the casing of the capsule type medical device, between from one end of the casing in its longitudinal direction to the other end thereof.

7. A capsule type medical device system according to claim 6, wherein

a projecting portion which includes an inclined portion which slopes with respect to the axial line along the longitudinal direction of the casing of the capsule type medical device is provided, and

the one electrode and the other electrode are provided upon the inclined surface.

8. A capsule type medical device system according to claim 7, wherein

the inclined portion comprises a portion which inclines towards a one end of the longitudinal direction of the casing of the capsule type medical device, and a portion which inclines towards the other end of the longitudinal direction of the casing, and

at least one group of the one electrode and the other electrode are disposed in respective portions of the inclined portion.

9. A capsule type medical device system according to claim 3, wherein the contact detection device is a force detection device.

10. A capsule type medical device system according to claim 9, wherein the force detection device is strain gauges which are equipped to the electrodes which are connected to the high electrical potential side and the electrodes which are connected to the low electrical potential side.

11. A capsule type medical device system according to claim 3, wherein the contact detection device is a device which measures the impedance between the electrode which is connected to the high electrical potential side and the electrode which is connected to the low electrical potential side.

12. A capsule type medical device system according to claim 3, wherein the electrical stimulation device comprises:

a waveform generator which generates a predetermined voltage waveform;

a conversion circuit which converts the voltage waveform to electric current;

a limitation circuit which is used for adjusting the electric current which flows to the electrode; and

an electric current sensor which detects the electric current,

wherein the control section adjusts the gain of the limitation circuit according to the output of the electric current sensor.

13. A capsule type medical device system according to claim 12, wherein the electrical stimulation device comprises a resistor between the limitation circuit and the electrode.

14. A capsule type medical device system according to claim 12, wherein the electrical stimulation device generates an electric current waveform which is a continuous curve of roughly square form.

15. A capsule type medical device system according to claim 12, wherein the electrical stimulation device generates an electric current waveform which is a step shaped triangular wave.

16. The capsule type medical device system according to claim 1, further comprising a first detection device which detects positional information regarding a position at which the capsule type medical device is located, wherein

the region determination device determines the bodily region at which the capsule type medical device is located by comparing the positional information detected by the first detection device with the referencing information set in advance.

17. The capsule type medical device system according to claim 1, wherein

the second detection device comprises an acquisition device which acquires the in-vivo information, and

the region determination device determines the position of the capsule type medical device within the living body, by using the in-vivo information which is acquired by the acquisition device.

18. The capsule type medical device system according to claim 17, wherein

the acquisition device is an imaging device which takes images of the inside of the living body, and

the region determination device determines the position of the capsule type medical device within the living body, based upon an image which is taken by the imaging device.

19. The capsule type medical device system according to claim 18, wherein

the region determination device compares at least one characteristic of brightness, color, frequency distribution and bodily surface condition in the image with the referencing information set in advance, and thereby the region determination device determines the bodily region at which the capsule type medical device is located.

20. The capsule type medical device system according to claim 1, wherein

the capsule type medical device comprises a balloon which can be expanded so as to closely contact to living body tissue or can be shrunk down,

the electrode is provided upon the outer surface of the balloon, and

the control device expands or shrinks down the balloon, based upon the information of the bodily region.

21. The capsule type medical device system according to claim 17, wherein

the acquisition device is a pH sensor which measures the pH value within the living body, and

the region determination device determines the position of the capsule type medical device within the living body, based upon the pH value.

22. The capsule type medical device system according to claim 1, wherein

the capsule type medical device is provided with a plurality of the electrodes, and

the control device controls the electric current which flows in the plurality of electrodes, based upon the information of the bodily region.

23. The capsule type medical device system according to claim 1, further comprising

at least one of a body sampling section which samples the living body tissue and a body treatment section which treats the living body.

24. The capsule type medical device system according to claim 1, wherein

the electrode forms part of an outer surface of the capsule type medical device.

25. An operating method of capsule type medical device, comprising:

determining a bodily region at which the capsule type medical device is located based on referencing information set in advance;

generating a control signal based on information of the bodily region,

controlling the electric current which flows to an electrode provided on the capsule type medical device using the generated control signal;

detecting in-vivo information within the living body with a second detection device which is provided on the capsule type medical device, wherein the second detection device comprises an acquisition device which acquires the in-vivo information;

wherein the determining of the bodily region at which the capsule type medical device is located comprises comparing the in-vivo information detected by the second detection device with the referencing information set in advance;

determining an orientation of the capsule type medical device within the body based on the in-vivo information which is acquired by the acquisition device; and

wherein the controlling comprises controlling the electric current which flows in the electrode based on the orientation of the capsule type medical device.

26. The operating method of capsule type medical device according to claim 25, wherein the in-vivo information comprises at least one characteristic of brightness, color, frequency distribution and surface condition of the body.

27. An operating method of capsule type medical device, comprising:

determining a bodily region at which the capsule type medical device is located based on referencing information set in advance;

generating a control signal based on information of the bodily region,

controlling the electric current which flows to an electrode provided on the capsule type medical device using the generated control signal;

detecting in-vivo information within the living body by acquiring the in-vivo information;

wherein the determining of the bodily region at which the capsule type medical device is located comprises comparing the acquired in-vivo information with the referencing information set in advance;

determining an orientation of the capsule type medical device within the body based on the acquired in-vivo information; and

wherein the controlling comprises controlling the electric current which flows in the electrode based on the orientation of the capsule type medical device.

28. The operating method of capsule type medical device according to claim 27, wherein the in-vivo information comprises at least one characteristic of brightness, color, frequency distribution and surface condition of the body.