1. A control device of a dental handpiece, comprising:
a voltage application portion for applying voltage to a motor for rotating a cutting tool mounted to the dental handpiece, the motor being built in the dental handpiece;
a rotational direction switching portion for switching a rotational direction of the motor by switching a polarity of voltage, which is applied to the motor by the voltage application portion; and
a control portion for controlling a magnitude of the voltage applied by the voltage application portion,
wherein the control portion obliquely decreases voltage in advance of switching of voltage polarity, which is conducted by the rotational direction switching portion, the voltage being applied to the motor by the voltage application portion.
2. The control device of a dental handpiece according to claim 1, wherein voltage to be applied to the motor from the voltage application portion is obliquely increased after the voltage polarity has been switched.
3. The control device of a dental handpiece according to claim 1, wherein the control portion controls so that the rotational direction switching portion carries out switching of the voltage polarity at every lapse of a predetermined certain time.
4. The control device of a dental handpiece according to claim 1, further comprising a sensor for detecting a rotation angle of the motor,
wherein the control portion controls so that, when a rotation angle of the motor detected by the sensor reaches a predetermined certain angle, the rotational direction switching portion carries out switching of the voltage polarity.
5. The control device of a dental handpiece according to claim 2, wherein the control portion has a function of calibrating a rate RT, which increases or decreases voltage to be applied to the motor from the voltage application portion.
6. The control device of a dental handpiece according to claim 5, wherein the control portion performs variable control of the rate RT.
7. The control device of a dental handpiece according to claim 6, wherein the control portion performs variable control of the rate RT depending on a rotation speed of the motor.
8. The control device of a dental handpiece according to claim 6, wherein the control portion performs variable control of the rate RT depending on a load torque applied to the motor.
9. The control device of a dental handpiece according to claim 6, wherein a plurality of rates causing voltage to decrease or increase, the voltage being applied to the motor from the voltage application portion, and the control portion performs variable control of the rate RT depending on a rate selected out of the plurality of rates.
10. The control device of a dental handpiece according to claim 6, wherein the control portion performs variable control of the rate RT depending on a distance from an apic of treatment subject to the cutting tool.
11. The control device of a dental handpiece according to claim 1, wherein the control portion performs variable control of a back-and-forth time T of the motor depending on an extent of heat generation of the motor, the back-and-forth time T being specified by a following equation 2.
T=Tcw+Tstop+Tccw\u2003\u2003Equation 2
Back-and-forth time T of a motor: Time required for forward rotation and reverse rotation of the motor
Tcw: Time required for forward rotation of the motor
Tccw: Time required for reverse rotation of the motor
Tstop: Standing time of the motor required when the rotational direction is switched from forward rotation to reverse rotation
12. A control device of a dental handpiece, comprising:
a voltage application portion for applying voltage to a motor for rotating a cutting tool mounted to the dental handpiece, the motor being built in the dental handpiece;
a rotational direction switching portion for switching a rotational direction of the motor by switching a polarity of voltage, which is applied to the motor by the voltage application portion; and
a control portion for controlling a magnitude of the voltage applied by the voltage application portion,
wherein the control portion obliquely decreases voltage in advance of switching of voltage polarity, which is conducted by the rotational direction switching portion, the voltage being applied to the motor by the voltage application portion,
wherein voltage to be applied to the motor from the voltage application portion is obliquely increased after the voltage polarity has been switched, and
wherein the control portion controls so that the rotational direction switching portion carries out switching of the voltage polarity at every lapse of a predetermined certain time.
13. A control device of a dental handpiece, comprising:
a voltage application portion for applying voltage to a motor for rotating a cutting tool mounted to the dental handpiece, the motor being built in the dental handpiece;
a rotational direction switching portion for switching a rotational direction of the motor by switching a polarity of voltage, which is applied to the motor by the voltage application portion;
a control portion for controlling a magnitude of the voltage applied by the voltage application portion; and
a sensor for detecting a rotation angle of the motor,
wherein the control portion obliquely decreases voltage in advance of switching of voltage polarity, which is conducted by the rotational direction switching portion, the voltage being applied to the motor by the voltage application portion,
wherein voltage to be applied to the motor from the voltage application portion is obliquely increased after the voltage polarity has been switched, and
wherein the control portion controls so that, when a rotation angle of the motor detected by the sensor reaches a predetermined certain angle, the rotational direction switching portion carries out switching of the voltage polarity.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An intraluminal medical device for placement within a vascular structure comprising:
a. a flexible body; and
b. a porous columnar metallic coating comprising a plurality of independent columnar structures separated from one another by an opening and disposed on at least a portion of the flexible body, wherein
(i) the porous columnar metallic coating extends in a substantially normal direction from a surface of at least a portion of the flexible body;
(ii) flaking of the porous columnar metallic coating being less than 1% of the porous columnar metallic coated surface when the flexible body and porous columnar metallic coating are strained up to 8%; and
(iii) the combination of the size of the columnar structures of the porous columnar metallic coating and the size of the openings between the columnar structures of the porous columnar metallic coating results in an emissivity in the visible spectrum range of at least 80%.
2. The intraluminal medical device of claim 1, wherein the
flexible body partially comprises a radio transparent material and
the porous columnar metallic coating on at least a portion of the flexible body comprises Ta.
3. The intraluminal medical device of claim 2, wherein the porous columnar Ta coating thickness is between approximately 3 and 10 microns.
4. The intraluminal medical device of claim 2, wherein the porous columnar Ta coating is applied to the flexible body by a physical vapor deposition process.
5. The intraluminal medical device of claim 4, wherein the physical vapor deposition process includes one of the group of sputtering, cathodic arc deposition or thermal evaporation.
6. The intraluminal medical device of claim 2 further comprising a material in the porous columnar Ta coating, wherein the material diffuses out over time.
7. The intraluminal medical device of claim 2, wherein the flexible body comprises nitinol.
8. The intraluminal medical device of claim 2, wherein the intraluminal medical device is a stent.
9. The intraluminal medical device of claim 2, wherein the intraluminal medical device is a guide wire.
10. The intraluminal medical device of claim 2, wherein the intraluminal medical device is a catheter.
11. The intraluminal medical device of claim 1, wherein the flexible body further comprises
an elastic shape retaining body having an outer surface,
the porous columnar metallic coating is disposed on at least a portion of the outer surface, wherein the porous columnar metallic coating is applied using a physical vapor deposition process.
12. The intraluminal medical device of claim 1, wherein the flexible body further comprises
a deformable body.
13. The intraluminal medical device of claim 1, wherein the flexible body further comprises an elastic shape retaining body at least partially comprising a material having superelasticity and shape memory.
14. The intraluminal medical device of claim 13, wherein the intraluminal medical device is a stent for use in a biological vessel.
15. The intraluminal medical device of claim 13, wherein the porous columnar metallic coating is a radiopaque coating.
16. The intraluminal medical device of claim 13, wherein the flexible body comprises nitinol.
17. The intraluminal medical device of claim 1, wherein the porous columnar metallic coating is selected from the group consisting of gold, platinum, tantalum, and tungsten.
18. The intraluminal medical device of claim 1, wherein a drug is incorporated into the porous columnar metallic coating.
19. The intraluminal medical device of claim 1, wherein the intraluminal medical device is implantable and further comprises a material in the porous columnar metallic coating that diffuses out over time when implanted.
20. The intraluminal medical device of claim 19, wherein the intraluminal medical device is a stent.
21. The intraluminal medical device of claim 1, wherein the intraluminal medical device is a guide wire.
22. The intraluminal medical device of claim 1, wherein the intraluminal medical device is a stent.
23. The intraluminal medical device of claim 1, wherein the intraluminal medical device is a catheter.
24. An intraluminal medical device for placement within a vascular structure comprising:
a. a flexible body fabricated from a shape memory alloy having an Af value below body temperature; and
b. a porous columnar metallic coating disposed on at least a portion of the flexible body comprising a plurality of independent columnar structures separated from one another by an opening, wherein
(i) the independent columnar structures extend in a substantially normal direction from a surface of at least a portion of the flexible body;
(ii) the flexible body and porous columnar metallic coating are operable to withstand strains up to 8%, wherein flaking of the porous columnar metallic coating is less than 1%; and
(iii) the combination of the sizes of the independent columnar structures of the porous columnar metallic coating and the sizes of the openings between the independent columnar structures results in an emissivity in the visible spectrum range of at least 80%.
25. The intraluminal medical device of claim 24, wherein the shape memory alloy comprises nitinol.
26. The intraluminal medical device of claim 24, wherein the intraluminal medical device further comprises a material disposed within the porous columnar metallic coating, the material diffusing from the porous columnar metallic coating for a period of time after implantation of the intraluminal medical device within the vascular structure.
27. An intraluminal stent, comprising:
a. a substrate body fabricated from a shape memory alloy, wherein the shape memory alloy comprises first Af value below body temperature before a porous columnar metallic coating is applied to a surface of at least a portion of the substrate body; and
b. the porous columnar metallic coating comprising a plurality of independent columnar structures separated from one another by a space, wherein each of the independent columnar structures extend in a substantially normal direction from the surface of at least a portion of the substrate body and the porous columnar metallic coating has an emissivity in the visible spectrum range of at least 80%.
28. The intraluminal stent of claim 27, wherein the intraluminal stent further comprises a material disposed within the porous columnar metallic coating, the material diffusing from the porous columnar metallic coating for a period of time after implantation of the intraluminal stent within a luminal structure.
29. The intraluminal stent of claim 27, wherein flaking of the porous columnar metallic coating is less than 1% when the intraluminal stent is strained up to 8%.
30. The intraluminal stent of claim 27, wherein the shape memory alloy further comprises a second Af after the porous columnar metallic coating is disposed on the surface of at least a portion of the substrate body, the second Af is below body temperature.