Project data

Goniometers are simple devices used to measure the angular range of motion of human limbs. It is common for doctors to monitor the muscular recovery and rehabilitation of a patient using a goniometer. They are not expensive, however they are flimsy and break easily. A 3D printed goniometer can be more durable than a commercial one. Additionally, one may not always have a goniometer handy. Being a relatively simple device, a goniometer prints very quickly and cheaply. Typically, a doctor will use a goniometer to measure the range of motion of a patient. However, with the 3D printed version being so extremely cheap, patients can be provided their own goniometers to monitor their own range of motion, thus reducing expensive doctor's visits.

## Bill of Materials

Provide a full BOM -- Materials needed for fabrication of device and alternative materials if they are not available, prices/sources of non-printable parts

1. Printed parts on Thingiverse http://web.archive.org/web/20210121123342/https://www.thingiverse.com/thing:4022729 (Cost: 16 cents total filament use)
2. Pencil (Cost: <1.00 to purchase, however they are very common and can be borrowed at no cost) 3. Small piece of paper (Cost: Take from recycling/garbage. This should be found for free with no issues) ## Tools Needed 1. MOST Delta RepRap or similar RepRap 3-D printer 2. Paper 3. Pencil 4. Straightedge 5. Protractor 6. Scissors 7. Glue Stick ## Skills and Knowledge Necessary • Minor scissor skills to make the paper slip with the angle measurements ## Technical Specifications and Assembly Instructions • Provide directions for print/assembly - be detailed enough in your "how to" to ensure that someone could construct the device from your description. Consider the elegance of IKEA like instructions. • Include print time estimate • Include assembly time estimate • Including drawings or pictures of the device at stage of assembly at minimum. (Upload) #### 1. Print Parts • Using your 3D printer, print out the attached thingiverse files • Print 1x gen_base_01.stl, 1x geniometer_spinner_01.stl, 2x goniometer_extend.stl • Total print time estimate: 40min Print Settings: Resolution: 0.3 mm Temperature: 205 C Material: PLA Print speed: 20mm/s edges, 40 mm/s infill Infill: 20% Retraction: ON, Z-hop: ON, Skirt: ON  #### 2. Paper Slip • Using the scissors, cut the small piece of paper to fit inside the rounded portion of the printed part (gen_base_01.stl). This will serve as the angular scale for the goniometer. The paper should fit in the region outlined in red. • With the protractor, transfer the angle measurements from the protractor in increments on 10 degrees onto the rounded slip of paper cut in step 2. Ensure that the measurements of 0 & 180 degrees line up with the center pivot point of the part. • Using the glue stick, attach the paper to the radial spokes protruding from the center pivot. The paper should sit below the outer rim of the rounded section. #### 3. Snap Together • Snap the printed parts (gen_base_01.stl) and (geniometer_spinner_01.stl) together through the centers of the rounded portions (outlined in green). They should be aligned so that when the handles are pointing in opposite directions, their long straight edges align. • To make the goniometer longer, take the printed parts (goniometer_extend.stl) and fit their diamond shaped extrusions into the ovular openings on the handles of (gen_base_01.stl) and (geniometer_spinner_01.stl). ### Common Problems and Solutions • The male end of the circular snap fitting can turn out poorly if the print speed is too high. I used a maximum of 40 mm/s ## Cost savings • Total print cost of OSAT Goniometer,0.16
• Paper/Pencil/Glue costs: Negligible
• Commercial equivalent: $4.19 Goniometer at Allegro Medical • Total Savings:$4.03
• Relative Savings: 96.2%

## References

Page data
Type Project 3d printing, goniometer, medical device, osat, metal, plastic SDG03 Good health and well-being, SDG11 Sustainable cities and communities Eric Houck, Kathy Nativi 2019 CC-BY-SA-3.0 MTU, Michigan_Tech's_Open_Sustainability_Technology_Lab, MY4777 English (en) 208 Eric Houck, Kathy Nativi (2019). "3D printed goniometer". Appropedia. Retrieved August 8, 2022.
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