Processing

Please wait...

Settings

Settings

Goto Application

1. WO2019057685 - STENT MONITORING

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS

1 . A probe (1 , 101 , 201 , 301 ) for monitoring stents comprising:

- a first coupling port (2, 102, 302) configured to launch an electromagnetic field onto a stent (5), such that a guided electromagnetic wave is propagated through at least a portion of the stent (5); and

- a second coupling port (3, 103, 303) configured to collect the electromagnetic field from the guided electromagnetic wave of the stent (5).

2. The probe according to claim 1 , further comprising: a ground element (6, 106, 306) disposed in a region of the probe in between both coupling ports so as to propagate an image of the guided electromagnetic wave of the stent, such that a propagation mode of the guided electromagnetic wave in the stent (5) is of a transverse electromagnetic mode type.

3. The probe according to claim 1 , further comprising: a ground element (6, 106, 306) disposed in a region of the probe in between both coupling ports so as to propagate an image of the guided electromagnetic wave of the stent, such that an electric and magnetic field distribution in at least a portion of the stent (5) and at least a portion of the corresponding image of the guided electromagnetic wave of the stent, corresponds to that in a two-wire line.

4. The probe according to any one of claims 2 - 3, wherein the ground element (6) comprises a laminar body having at least two openings (23, 33, 323, 333) for receiving the first coupling port (2, 102, 302) and the second coupling port (3, 103, 303) respectively

5. The probe according to claim 4, wherein the openings (323, 333) are "half-moon" shaped.

6. The probe according to any one of claims 4 - 5, wherein the ground element (6) comprises a plurality of holes (341 ) aligned with each other and positioned between the at least two openings (323, 333).

7. The probe according to any one of claims 4 - 6, further comprising a gap (22, 32) between the ground element (6) and an electrode (21 , 31 ) of at least one of the first coupling port and the second coupling port, such that the electrode of at least one of the first coupling port and the second coupling port is separated from the ground element at the corresponding opening.

8. The probe according to any one of claims 1 - 5, further comprising a conducting element (43) between the first and second coupling ports (2, 102, 302, 3, 103, 303), such that both coupling ports are in electrical communication.

9. The probe according to any one of claims 2 - 5, further comprising a bridging element (44) configured to electrically connect at least one of the coupling ports (2, 102, 302, 3, 103, 303) to the ground element (6, 106, 306).

10. The probe according to any one of claims 1 - 9, wherein at least one of the first coupling port and the second coupling port comprises an electrode with coaxial configuration.

1 1 . The probe according to claim 4, wherein at least one of the first coupling port and the second coupling port comprises an electrode with flat configuration, the electrode being coplanar to the ground element.

12. The probe according to any one of claims 1 - 1 1 , further comprising a supporting base (212) to position at least the first coupling port and the second coupling port, such that at least one connecting axis (CA) is defined between the first coupling port (2, 102, 302) and the second coupling port (3, 103, 303),

13. The probe according to claim 12, wherein the supporting base (212) comprises a rotor to position at least the first coupling port and the second coupling port, wherein the rotor is rotatable around a rotation axis (RA), the rotation axis (RA) being perpendicular to the connecting axis (CA).

14. The probe according to any one of claims 1 - 1 1 , further comprising a supporting base (212) to position a plurality of first and second coupling ports (2, 102, 302, 3, 103, 303), the coupling ports being disposed in circular path, such that a connecting axis (CA) is defined between at least a pair of first coupling port (2, 102, 302) and second coupling port (3, 103, 303).

15. The probe according to any one of claims 12 - 14, further comprising a shaft (213) attached to the supporting base (212).

16. The probe according to any one of claims 12 - 15, further comprising: a layered body which comprises a ground element layer attached to a dielectric substrate layer, wherein

the ground element layer and the substrate layer are flexible.

17. The probe according to any one of claims 1 -16, further comprising: a low-noise amplifier associated to the second coupling port.

18. The probe according to any one of claims 1 -17, wherein the electromagnetic field is a microwave electromagnetic field.

19. A system (400) for monitoring stents, which comprises:

- a probe (1 , 101 , 201 , 301 ) according to any one of claims 1 - 18; and

- a measuring device (10), in electrical communication with the first coupling port (2, 102, 302) and the second coupling port (3, 103, 303), to measure an input signal of the first coupling port and an output signal of the second coupling port, the input signal being related to the electromagnetic field launched onto the stent and the output signal being related to the electromagnetic field collected from the guided electromagnetic wave of the stent.

20. A method (500) of monitoring stents using a probe (1 , 101 , 201 , 301 ), the method comprising:

- sensing an input signal related to an electromagnetic field launched by a first coupling port (2, 102, 302) onto the stent (5) for propagating a guided electromagnetic wave through at least a portion of the stent, and sensing an output signal related to the electromagnetic field collected by a second coupling port (3, 103, 303) from the guided electromagnetic wave of the stent;

- obtaining a transmission coefficient (S) between the first coupling port (2, 102, 302) and the second coupling port (3, 103, 303), wherein the transmission coefficient (S) is obtained by comparing the input signal with the output signal;

- performing a frequency response of the transmission coefficient (S); and

- comparing the frequency response of the transmission coefficient (S) with a reference frequency response;

21 . The method (500) according to claim 20, further comprising: determining at least one maximum (f0) and/or one minimum (fa) of the transmission coefficient (S) after performing a frequency response of the transmission coefficient (S).

22. The method (500) according to claim 21 , wherein the probe (1 , 101 , 201 , 301 ) comprises a supporting base (212) to position at least the first coupling port (2, 102, 302) and the second coupling port (3, 103, 303), such that at least one connecting axis (CA) is defined between the first coupling port and the second coupling port, the method further comprising: performing the frequency response of the transmission coefficient (S) at each of a plurality of relative positions of the connecting axis (CA) with respect to a longitudinal axis (LA) of the stent, such that each position defines an angle (AG) between the connecting axis (CA) and the longitudinal axis (LA) of the stent (5).

23. The method (500) according to claim 22, further comprising: determining an indicator of a distance between the probe (1 , 101 , 201 , 301 ) and the stent (5) by calculating a function relating the minimum (fa) of the transmission coefficient to each of the plurality of relative positions, performing a derivative of the function at a predefined relative position and comparing the output of the derivative with a reference output.

24. The method (500) according to any of claims 20 - 23, further comprising: determining an indicator of the status of the stent by comparing the frequency response of the transmission coefficient with the reference frequency response.

25. A computer program comprising program instructions for causing a measuring device to perform a method according to any one of claims 20 to 24 of monitoring stents using a probe (1 , 101 , 201 , 301 ).

26. The computer program according to claim 25, embodied on at least one of the following: a storage medium and a carrier signal.

27. A measuring device (10) comprising:

- means for sensing an input signal related to an electromagnetic field launched by a first coupling port (2, 102, 302) onto the stent (5) for propagating a guided electromagnetic wave through at least a portion of the stent, and sensing an output signal related to the electromagnetic field collected by a second coupling port (3, 103, 303) from the guided electromagnetic wave of the stent;

- means for obtaining a transmission coefficient (S) between the first coupling port (2, 102,

302) and the second coupling port (3, 103, 303), wherein the transmission coefficient (S) is obtained by comparing the input signal with the output signal;

- means for performing a frequency response of the transmission coefficient (S); and

- means for comparing the frequency response of the transmission coefficient (S) with a reference frequency response.

28. A measuring device comprising a memory and a processor, embodying instructions stored in the memory and executable by the processor, the instructions comprising

functionality to execute a method as defined in any one of claims 20 - 24 of monitoring stents using a probe.