Determining a position of a medical device to be localized

Patent metadata

Field	Value
Publication number	US-9974615-B2
Application number	US-201114346883-A
Country	US
Kind code	B2
Filing date	Sep 28, 2011
Priority date	Sep 28, 2011
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

A method of determining the position of a medical device to be localized, comprising:
a) acquiring main position data comprising reference structure position information which describes the position of a reference structure in a global coordinate system, the main position data having been gathered by a main detection device; b) acquiring supplement position data comprising relative position information which describes the position of the medical device relative to the position of the reference structure in a reference coordinate system, the supplement position data having been gathered by a supplement detection device; c) determining, based on the relative position information and the reference structure position information, medical device position data comprising medical device position information which describes the position of the medical device in the global coordinate system.

First claim

The invention claimed is:

1. A method of tracking a position of a medical device in a system comprising the medical device, a first detection device, a second detection device that is continuously maintained in a fixed spatial relationship relative to the medical device, a reference structure, a display, and a computer operatively associated with the first detection device, the second detection device, and the display, the method comprising:
a) determining by the computer using the first detection device a global position of the reference structure in a global coordinate system;
b) determining, by the computer using the second detection device that is continuously maintained in a fixed spatial relationship relative to the medical device, a relative position of the medical device relative to the reference structure in a reference coordinate system;
c) determining, by the computer, a tracked position of the medical device in the global coordinate system based on the global position of the reference structure and the relative position of the medical device;
d) determining, by the computer, user information data based on the tracked position of the medical device; and
e) displaying the user information data on the display.

2. The method according to claim 1 , wherein the second detection device is attached in a fixed spatial relationship to the medical device.

3. The method according to claim 1 , wherein the reference structure includes a reference definition means for defining the position of the reference structure, the reference definition means having detectable geometry features and/or a detectable graphic pattern.

4. The method according to claim 3 , wherein the determining the global position of the medical device comprises:
determining, by the computer using the first detection device, a position of the reference definition means in the global coordinate system; and
determining, by the computer, the global position of the reference structure based on the position of the reference definition means.

5. The method according to claim 3 , wherein:
the determining the relative position of the medical device relative to the reference structure includes detecting the reference definition means by the second detection device that is continuously maintained in a fixed spatial relationship relative to the medical device.

6. The method according to claim 5 , comprising:
acquiring, by the computer, reference appearance information that describes a reference image appearance of the reference definition means;
determining, using the second detection device that is continuously maintained in a fixed spatial relationship relative to the medical device, actual reference appearance information that describes an actual image appearance of the reference definition means;
determining, by the computer, actual perspective distortion information based on a comparison of the reference appearance information and the actual reference appearance information; and
determining the relative position of the medical device relative to the reference structure based on the actual perspective distortion information.

7. The method of claim 6 , wherein the determining the actual perspective distortion information includes:
defining, by the computer using the reference appearance information, a basic perspective based on a particular angle of view at a particular distance from the reference definition means;
determining, by the computer, an actual perspective based on the actual reference appearance information,
determining, by the computer, the actual perspective distortion information based on the basic perspective and the actual perspective.

8. The method of claim 3 , wherein the reference definition means is defined by the physical appearance and/or geometry of the reference structure.

9. The method according to claim 1 , comprising:
acquiring, by the computer, reference appearance information that describes a reference image appearance of the reference structure and;
determining, using the second detection device that is continuously maintained in a fixed spatial relationship relative to the medical device, actual reference appearance information that describes an actual image appearance of the reference structure;
determining, by the computer, actual perspective distortion information based on a comparison of the reference appearance information and the actual reference appearance information; and
determining the relative position of the medical device relative to the reference structure based on the actual perspective distortion information.

10. The method of claim 9 , wherein the determining the actual perspective distortion information includes:
defining, by the computer using the reference appearance information, a basic perspective based on a particular angle of view at a particular distance from the reference structure;
determining, by the computer, an actual perspective based on the actual reference appearance information; and
determining, by the computer, the actual perspective distortion information based on the basic perspective and the actual perspective.

11. The method of claim 1 , wherein the reference structure is medical equipment to be used in a medical procedure.

12. A non-transitory computer readable storage medium storing a computer program for tracking a position of a medical device in a system comprising the medical device, a first detection device, a second detection device that is continuously maintained in a fixed spatial relationship relative to the medical device, a reference structure, a display, and a computer comprising the non-transitory computer readable storage medium that is operatively associated with the first detection device, the second detection device, and the display, which, when running on a computer or when loaded onto a computer, causes the computer to:
a) determine, using the first detection device, a global position of the reference structure in a global coordinate system;
b) determine, using the second detection device that is continuously maintained in a fixed spatial relationship relative to the medical device, a relative position of the medical device relative to the reference structure in a reference coordinate system;
c) determine a tracked position of the medical device in the global coordinate system based on the global position of the reference structure and the relative position of the medical device;
d) determine user information data based on the tracked position of the medical device; and
e) display the user information data on the display.

13. A system for tracking a position of a medical device, comprising:
the medical device;
a first detection device;
a second detection device that is continuously maintained in a fixed spatial relationship relative to the medical device;
a reference structure;
a display; and
a computer operatively associated with the first detection device, the second detection device, and the display, the computer configured to:
a) determine, using the first detection device, a global position of the reference structure in a global coordinate system;
b) determine, using the second detection device that is continuously maintained in a fixed spatial relationship relative to the medical device, a relative position of the medical device relative to the reference structure in a reference coordinate system;
c) determine a tracked position of the medical device in the global coordinate system based on the global position of the reference structure and the relative position of the medical device;
d) determine user information data based on the tracked position of the medi

Assignees

• Woerlein Swen
• Manus Johannes
• Brainlab Ag

Inventors

• Woerlein Swen
• Manus Johannes

Classifications

• A61B34/20 Primary

  Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis · CPC title

• A61B2034/2055

  Optical tracking systems · CPC title

• A61B2034/2068

  using pointers, e.g. pointers having reference marks for determining coordinates of body points · CPC title

• A61B2034/2074

  Interface software · CPC title

• A61B5/061

  Determining position of a probe within the body employing means separate from the probe, e.g. sensing internal probe position employing impedance electrodes on the surface of the body (A61B1/00158 takes precedence) · CPC title