YY 0844-2011Laser therapeutic equipment—Pulsed carbon dioxide laser treating instrument (English PDF)

3.1 50%-pulse duration

tau50 It refers to the time interval between the rise and fall of the laser pulse to its 50% peak power point, as shown in Figure 1.

3.2 Time

Power P peak 50% P 10% P Pulse repetition period (T)

10%-pulse duration tau10 It refers to the time interval between the rise and fall of the laser pulse to its 10% peak power point, as shown in Figure 1.

3.3 50%-pulse power

P50 is the ratio of pulse energy Q to 50%-pulse duration (50% pulse width) tau50, as shown in equation (1).

3.4 10%-pulse power

P10 is the ratio of pulse energy Q to 10%-pulse duration (10% pulse width) tau10, as shown in equation (2).

4.1 Composition of treatment instrument

a) Carbon dioxide laser;

b) Power and control systems;

c) Safety protection system;

d) Targeting and transmission systems;

e) Cooling systems;

f) Output systems and accessories (which may include output hand tools, scanning devices/dot matrix output devices, etc.).

4.2 Basic parameters of treatment instrument

a) Wavelength and mode of treatment laser;

b) Treatment laser terminal output pulse energy Q, pulse train energy Qtrain, average power Pav, pulse power P50 and P10;

c) Treatment laser pulse duration (pulse width) tau (tau50 and tau10), pulse repetition period T or pulse repetition frequency f or duty cycle eta (SEE Figure 1 and

2);

d) Treatment laser pulse train duration (pulse train width) T1, pulse train time interval T2 (SEE Figure 2) or pulse train repetition period Ttrain; in-train pulse number n, in-train pulse duration (pulse width) tau (tau50 and tau10), the in-train pulse repetition period T (SEE Figure 1 and 2);

e) Treatment laser terminal output divergence angle, focal (light) spot diameter;

f) Targeting light wavelength;

g) Targeting light power.

4.3 Safety category

The manufacturer shall list the following safety categories in the registered product standards.

a) Class and type in accordance with the provisions of GB 9706.1;

b) Category of laser radiation in accordance with GB 7247.1.

Single pulse output mode Power P/W Ppeak Power P/W Ppeak Power P/W Pmean Ppeak Pmean Power P/W Ppeak Pmean Repeated pulse output mode T. pulse repetition period T. pulse duration Time/s Time/s Pulse train single output mode Pulse train repeated output mode Foot switch pressed Time/s Time/s T1. Pulse train duration T. Pulse repetition period tau. Pulse duration n.

5.1 Normal operating conditions

The manufacturer shall specify at least the following parameters for normal operating conditions.

- Ambient temperature;

- Relative humidity;

- Power supply used.

5.2 Treatment laser

5.2.3 Laser pulse output mode and its time characteristics (SEE Figure 1 and Figure 2)

5.2.3.1 The manufacturer shall specify the laser pulse output mode, which may include (SEE Figure 2).

b) Pulse repetition output mode;

c) Pulse train single output mode;

d) Pulse train repetition output mode.

5.2.3.2 Laser pulse duration (pulse width) tau50 and tau10, pulse repetition period T or pulse repetition frequency f or duty cycle eta.

5.2.1 Laser wavelength

10.6 µm ± 0.1 µm.

5.2.2 Laser mode

Fundamental transverse mode or multimode.

a) Single pulse output mode;

A) If tau50 cannot be adjusted by the operator, the manufacturer shall specify the nominal value of tau50 and its allowable tolerance under the corresponding output mode, or the range of tau50; AND meanwhile give the corresponding nominal value of tau10 and its allowable tolerance, or the range of tau10. If T cannot be adjusted by the operator, the manufacturer shall specify the nominal value of T and its allowable tolerance under the corresponding output mode, or the range of T; AND the above allowable tolerances shall not exceed ± 20%.

Note: allowable tolerance refers to the allowable deviation of the measured value of the actual output from its nominal value or set value (deviation refers to the algebraic difference of the measured value of the actual output minus its nominal value or set value), same as below.

B) If tau50 can be adjusted by the operator, the manufacturer shall specify the setting range and its allowable tolerance of tau50 under the corresponding output mode, AND meanwhile provide the corresponding range of tau10 and its tolerance; […]