Low Power Laser Therapy Device With Segmented Beam Expansion
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Solution Overview
Problem
Existing low power therapy laser devices, such as the Safe Laser SL500, have limited penetration depth and irradiated spot area due to power density constraints, making them ineffective for treating deep tissues and larger joint areas, as increasing power density is limited by safety thresholds and the devices' design restricts the arrangement of multiple units.
Innovation Solution
A low power therapy laser device with a cylindrical housing containing four lasers arranged in a square configuration, each with a beam expander and diverting lenses, which scatters the laser light to create a larger, uniformly irradiated area with increased penetration depth, ensuring power density remains within safety limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the power of the laser light is increased to treat deep tissues and larger areas, then the penetration depth and irradiated area would improve, but the power density at the body surface would exceed safety thresholds
Solution Approach 1:
The device divides a single high-power laser source into four separate laser units, each emitting at safe power density levels. By segmenting the total power output across multiple sources arranged in a square configuration, the device achieves deep tissue penetration equivalent to a single high-power source while maintaining surface power density within safety thresholds.
Solution Approach 2:
The patent combines four separate laser beams through optical merging to create a unified irradiation field. The beams from the four corner-mounted lasers are directed to converge and overlap in the target tissue, producing a combined effect that reaches deep tissues uniformly while each individual beam remains below the safety threshold at the skin surface.
2Area of stationary object
If multiple laser devices are arranged side-by-side to increase irradiated area, then the covered area would improve, but the treatment becomes inhomogeneous and the head diameter increases beyond practical limits
Solution Approach 1:
Instead of arranging multiple separate devices side-by-side, the patent integrates four laser sources within a single device housing at the corners of a square. The optical system merges the four beams into a unified irradiation pattern, creating a large homogeneous treatment area without increasing the overall device head diameter beyond practical handheld limits.
Solution Approach 2:
The patent transitions from a single central laser source to a two-dimensional array of four corner-mounted lasers. This spatial arrangement in a square configuration allows the beams to overlap and create a uniform large-area irradiation field, effectively utilizing dimensional distribution to expand treatment coverage while maintaining device compactness.
3Power
If a single high-power laser is used to treat large areas, then the power density would be sufficient, but the irradiated spot area remains limited and cannot cover large joints effectively
Solution Approach 1:
The device segments the irradiation task into four separate laser sources positioned at the corners of a square. Each laser contributes to a portion of the overall treatment area, and their beams overlap to create a unified large-area irradiation field with sufficient power density throughout, effectively covering large joints and extensive tissue areas.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves a substantial increase in both penetration depth and irradiated area size, providing consistent therapeutic intensity across a larger region without power density exceeding safety thresholds, effectively treating deeper tissues and larger areas like knee joints and cartilage problems.
Implementation Method 1
a beam expander arranged in the beam path of the laser
Implementation Method 2
diverting lenses built together or separately from the beam expander... which scatters the laser light to create a larger, uniformly irradiated area
Data Source
Figure 1~2
Figure 3~4
AI summary
Improved low power therapy laser device (10) comprising a housing (11), a laser light source arranged in the housing (10), a beam expander (18) arranged in the beam path of the laser and diverting lenses (19) in front of the beam expander, and the hollow cavity (20) of the head portion (13) is closed at the front by a transparent closing element (15), wherein in the cavity (20) of the head portion (13) in an even circular distribution at least three lasers (12a, 12b, 12c and in given cases 12d) are arranged, and in front of them respective beam expanders (18a, 18b, 18c and 18d) are arranged, the beam expanders (18a, 18b, 18c and 18d) contact and support each other along respective large surfaces, and the diverting lenses (19) are arranged in an even distribution in front of the beam expanders (18a, 18b, 18c, 18d).