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Medical Design project of Design & Engineering course. Autumn semester 2013/2014

Medical Design project of Design & Engineering course. Autumn semester 2013/2014

Published in Design , Health & Medicine
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  • 1. 2014 Moving Patients! Creating smoother transitions for immobile patients in the hospital Kirill Andreitšuk Fabien Bernard Mart Kekišev Patrick Mallon Kerstin Oppe
  • 2. Contents profiles! general brief! regionaal haigla! personas! problem definition! market research! design brief! concept sketches! concept development! concept selection! prototyping & testing! user feed back! final design! technical drawings 01! 02! 03! 05! 06! 07! 09! 10! 11! 12! 19! 22! 23! 25
  • 3. Kerstin Oppe ! BA interior architecture & furniture design Patrick Mallon! Bachelors of Architecture Fabien Bernard! MEng of Mechanical Engineering, Design & Ergonomics Mart Kekišev! Bachelors of metal art and design ! ! Kirill Andreitšuk! BSc (Bachelor in Science) in Mechanical Engineering, TUT, Production Engineering and Product Development 2014! 01
  • 4. GeneralBrief The aim of the project is to understand and test how design can be used to bring forward a better medical care in the hospital by approaching two subjects: patient safety and patient dignity Patient dignity Patient safety Hospital environments are designed from functional aspects to offer better treatment and care. At the same time patients’ needs and expectations for privacy, personal dignity and comfort have received little to no attention. Human beings make mistakes mainly because the systems, tasks and processes they work in are poorly designed. Mistakes in hospital care are not unusual and could have very serious effects. The aim of the project is to make patients’ hospital experience better by helping them feel less vulnerable and more dignified in order to improve the quality of care. The aim of the project is to reduce number of errors within hospital care, make them easier to discover when they do happen and reduce the harmful effects of errors that do occur. ! work structure 01 research 02 concept generation 03 problem definition 04 embodiment design and prototyping 05 testing with patients 02
  • 5. regionaal haigla every workday…! 3700 employees will come to work! 1500 outpatient contact, incl. 250 emergencies! 100-300 hospital admission/discharges! 800-1000 patients treated as inpatients! up to 200 operations performed main ! entrance Average patient staying time in the hospital: 5 days ward floor plan 03
  • 6. Students of TUT Design and Engineering M.Sc. were invited to under take observational re s e a rc h a t P e r h H o s p i t a l between the 19th and 23rd of September 2013 in the aims of to improving the areas of patient safety & dignity. hospital vision: To be a recognised medical centre in Europe hospital mission: To assure medical security to the Estonian population and health care system as a multiprofiled hospital providing acute care. To be in the forefront in teaching, scientific and developmental work in medicine and health care After attending a lecture given by the head surgeon we were informed that one of the biggest problems at the hospital was the continual need to move patients in and out of their beds and the difficulty in lifting them of the ambulance stretcher. 04
  • 7. personas We took our 2 personas from both ends of the process – a patient and a nurse. An important aspect of this was to consider the behaviour and safety issues for both the performer and the passenger. Patient – Heli 71 Nurse – Kristel 28 Heli was taken to the hospital because of the severity of her joint pain. It has made her very hard and painful to move from her hips and legs. She is also in the hospital to get chemo therapy. This has made her a longer resident in the hospital. Above all, she misses being outdoors to see the sun and get fresh air instead of being in the ward all day with closed windows.
 Kristel is a new worker in the hospital and thus is just getting to know the systems of that hospital. Her assignments are helping the ward with transporting patients from bed to wheelchair and back and transporting them to necessary locations.
 Issues Issues
 Regardless of her good general health, she has a high risk of back injury, because the lifting and moving of patients is done while her muscles are not warmed up to be resistant for strain. In these cases, it is quite easy to hurt herself while lifting a patient in a slightly wrong position. She would normally require the help of a bigger and stronger male ward assistant, but he is not always available. Because of this her shift at work is physically exhausting.
 what does she need? 05 We want to make her work in the hospital safer. Our goal is to change the heavy lifting of patients in a way that it becomes effortless for her and removes the most obvious possibilities for her to hurt herself. This way, her work will be easier and she will be less tired at the end of the shift. Currently she is transported around the hospital on her bed. The bed needs two assistants to move and takes a long time to navigate the big thing in the hallways. Putting her into a wheelchair is not an option due to her incapability of moving herself. She weighs about 90 kilos and would need 2 assistants to get her to move into the wheelchair.
 What does she need?
 We want her transport around the hospital not to need two assistants and for the whole process to be less space demanding. In addition to that, her capability of having progress in healing in any way is clearly dependent on her getting daily fresh air and sun, because it is healthy and it makes her happy. Right now, that is not possible, as it is not safe for her nor the nurses to lift her into a wheelchair, and a bed can not be transported outside. Our goal is to make it possible for her.
  • 8. problem definition To explore current methods, cultures & technologies surrounding the lifting/moving of patients in the hospital, to identify inefficiencies and to propose creative solutions. ? “Patients are on average moved 4-5 times a day” Jüri Tera, MD, FACS chief Oncological and General Surgical Centre The need for patient-lifting equipment has grown in recent years. “What is happening nationally is that patients are getting older, sicker and heavier Joan Forte, interim director of nursing at Stanford Hospital & Clinics patient journeys immobile patient examination room washing & showering procedures & operations WC “In a 2001 survey of some 5,000 nurses, 40 percent said they had been injured on the job, and 60 percent cited disabling back injuries as one of the culprits.” American Nurses Association patient lounge Outside partially mobile patient 06
  • 9. mobile patient lift static patient lift chair bed bed chair Sliding devices 07
  • 10. market research Research was conducted to determine the existence of products that moved patients in and out of their beds and around the hospital.! ! An abundance of technological solutions were found to exist, ranging from engineering marvels such as a lifting robot donning a friendly bear exterior to a simple draw sheet that is placed underneath patients.! ! massage chair Some of the devices on the market hinted possible dignity issues, (as what healthy individual is used to being hung in a bag)! ! Other observations included the apparently awkward merging of technologies. A bed that could transform into unlikely chair, and a chair that could transform into an uncomfortable narrow bed, both provided useful guidance to design a product that was built from scratch for a specific purpose.! ! The products which impressed us most were the draw sheet, for its ease of operation and minimal movement required of the patient, and other devices which aided the sliding motion such as a hover mat. We decided that this sliding motion would become a core of our design.! barbers chair ! Additional inspiration was also sought from other more static equipment, (massage chair, barber chair) as they provided some of the most ergonomic and smooth transitions. The obvious weight needed to ground these contraptions provided early concerns to whether we could engineer something that was comfortable, safe and still light enough to move around the hospital.! ! Getting hands on with developing designs at university (see below) provided useful insights, but also reminded us that certain mechanisms were protected under copyright.! chair research 08
  • 11. Design Brief Making the transportation of patients throughout the hospital safer for nurses and more comfortable for patients by improving the movement of the patients in and out of their ward bed. concept Reducing physical stress for nurses & patients With emphasis on the swiftness & simplicity of the action No forced movement required by the patient. To t r a n s f o r m t h e transport from bed to wheelchair safer for patients and staff by providing a device that demands no forced movements from the patient and minimal stress on the ward assistant. b2b - identified problems: Aim of the research: ! To explore current methods, cultures & technologies surrounding the lifting/moving of patients in the hospital, to identify inefficiencies and to propose creative solutions. ! ! ! ! ! • • (b2w) + (w2b) Bed to Wheelchair : The moving of conscious mobility impaired patients from their beds to wheelchair. b2w - identified problems: • High numbers of staff required • High tech mechanical solutions • • • (b2b) Bed to Bed : From the ambulance bed to the hospital/ examination bed in accident and emergency scenarios. • • • Research for the moving of patients has been divided into two main topics of enquiry: ! ! ! ! ! Low tech lifting/moving solutions require many trained staff A degree of human error present and therefore patient pain 09 • High level of risk to patient due to lack of information on the nature of injury. ! ! ! ! ! ! High levels of Physical strength required High number of staff required High degree of training required High level of risk of injury to both patient and carers High level of pain for the patient Current technologies prohibitively expensive and only designed for one use
  • 12. concept sketches Strong arm There was always the danger of creating an over engineered mechanical monstrosity lightness of touch was crucial fabric + rollers + static frame t in o tp vo pi searching forr a pivot point a o f ng i ch r ea s It was established early on that piston technology was a sure way to make our product unnecessarily expensive and they were consciously left as a last option. 10
  • 13. concept development Most of the concept development focused on how many pivot points were necessary and where to place them. ! We established from physical experience that a 90 degree lifting motion from the waist was uncomfortable for the patient, as the head moved such a long distance ! Wheel designs were considered of secondary importance to transition movement and were designed at a later stage 11
  • 14. concept selection Stress deformation and technical details General mathematical information! In order to anticipate all necessary equations for each prototype, standard equations have been used. ! Gravity Center! All CAD model are integrated in a 3D space, that is why, the gravity center is considered according to the axles X, Y and Z. Prototype 1! To simplify our mathematical model, wheels and the brake system has not been modelled. The main static part is the support of the three pistons (and as well, of the wheels). ! 1) First solution, Static deformation (only in elastic area) in 90° wheelchair position.Modelled by Catia (with Manikin for having a real size in close relationship with standard data) Mathematical model and Stress deformation in mm (Von Mises criteria) by Ansys ! Safety coefficient: 2 Maximal weight of patient: 150 kg Maximal load applied for this test: 3000 N Materiel used: Aluminium With ! i = the name of the part m = weight of the part v = volume of the part =density This data is important for the mechanical aspect but also for the ergonomics aspect. Here, the human characteristics is essential. In this case, the mass ratio of the human body has to be known. 12
  • 15. 2) Second solution, Static deformation (only in elastic area) in 130° wheelchair position. Modelled by Catia (with Manikin for having a real size in close relationship with standard data) Mathematical model and Stress deformation in mm (Von Mises criteria) by Ansys So: ! Safety coefficient: 2 Maximal weight of patient: 150 kg Maximal load applied for this test: 3000 N -Leg part= 210N -Seat part= 2500N -Back part= 290N Materiel used: Aluminium With: F=m.g ! (g=9,81 m/s²) Safety coefficient: 2 So: For dimensioning the size of the pistons, the system is simplified into 3 parts. With: a=AB=300mm=0,3m b=BC=460mm=0,46m c=CD=950mm=0,95m ! It is expected to find the Moment Force (N/m) on the points A, B, C and D. Immediately, the Moment Force in B is equivalent to 0 because it is fix (this mechanism turns around this point). ! 13 Conclusion! In mechanics field, this solution works. So, the dimensioning of these three pistons, and the elbow part seems to be a good mechanical solution. The patient will have three possibilities: ! -bed position -wheel chair position (90°) -Transition position (here, team has decided to test a 130° angle (90+40)). ! For the medical staff, the brake system can be control by the treadle or the hand system. The hydraulics system is sufficient and gives an easily help system to manipulate the patient with a very effort.
  • 16. Prototype 2 ! As it is precised before in this report, the solution with piston has to replace by a solution working only with human force. With this condition, two others idea and prototype has been imagined and designed. ! The prototype 2 looks like the prototype 1 but without non-automatic piston (system cheaper, cleaner and with less maintenance). Additionally, it works with the famous rule of “the lever arm” reducing the human force and allowing to move a heavy patient. The following pictures show an overview and the autonomous pistons. The front wheels are not represented to simplify the finite elements analysis. This following picture shows the human weight repartition for each part (feet, legs, seat, back and head). The FEA has been carried out but with the same structure, the deformation is low and the system stays in the medical standard. Some parts have been removed and optimised. ! Conclusion! This solution could be interesting because it gives the same characteristics than before, but only manually. It will be more simple to make it and during the using, the nurse or the patient will not have any problem for use it. 14
  • 17. Prototype 3! This new prototype is radically different. The size is the same but the mechanism is different and also adapted for the human force. It works with a classic lever arm but with two translations (explained afterward). The following picture shows the mechanism with two Translation/rotation which are in close relation with the central pivot. ! The seat can rotate between 0° and 21,6° corresponding on the comfortable standards. This solution is autonomous, in other words, the mechanism allow to control every part by one part. ! If the leg part (pink part) moves, the seat part (blue part) and the back part (green part) will move automatically. But here, the green part will be the point control and the motion of the blue part and the pink part will be control by this way. This following picture shows the human weight repartition for each part (feet, legs, seat, back and head). 15
  • 18. To control the motion! This mechanism is interesting because it could control by one point. Indeed, with two translation/rotation and three rotations, every parts is linked between them. The motion of the Back part will cause the motion of the seat part and the leg part. With the standards, we can take a spring with k=20,01N/mm ! ! 1. By springs! To control the motion, it is decided to add two springs for both links “translation/rotation”, so 4 springs in total. ! ! ! ! Determination of the Spring size: It is remembered: So: 2. By piston ! This technical solution seems better and mainly safer. We propose to add one or two pistons on the back part. It will be linked between the top of the back part and the frame. It will be a double acting and it will give a safety condition for the transition motion between the chair and the bed position. ! This characteristic is given by: One piston version: By safety, for both it will be chosen 20 N/mm So: With F=2310N P=10 Bar=1N/mm² ! To select the piston, we need the radius: It will be necessary to use a piston with a radius of 15,3mm and a pressure of 10 Bar. 16
  • 19. Locking part! In order to lock our system in wheelchair position, we have chosen the same mechanism used in a bus (for example) with the elbow support. The following picture shows you the principe between 0° and 180° but with our system, it will work only between 0° and 21,6°. general conclusion As it was explained previously, the prototype 3 has been chosen for few reasons. ! -the mechanism and the kinematic are not the most simple but the system uses only one piston (or two, depends on the space available). ! -the reduction of the help systems (like piston, electric devices etc) allows to keep the light weight. ! -the reduction of the pneumatic or hydraulic system is in correlation with the hospital environment ! ! -the cost of the maintenance will be low -the production will be simple because it limits the waste of material and the shape is classic (weld system). ! Ergonomics This part is essential, again more in a hospital environment. Take in consideration the human factor allows to optimize the system during the designing and the virtual production. This system is thought to optimize the comfort of the patient, the medical staff but as well for the hospital environment with the dimension of the room, the corridor and every displacements. ! Bed position! The medical staff can move and walk without any difficulty and the patient has enough place on the bed to feel comfortable. 17 -the ergonomics part has been optimize for the patient, medical staff but for the hospital environment as well.
  • 20. Free wheely 1st iteration 18
  • 21. prototyping & testing Aluminium was our preferred material, but steel is much easier to weld Lifting motion its possible to go from flat to sitting to flat with very little effort while laying on it 19
  • 22. prototyping & testing proof of concept The form is slightly suggestive of a capable four legged animal connection details 20
  • 23. Second iteration the system appears ready for the patient to be slid over the support rails simplified joints and locking mechanism on the proof of concept prototype The handle now visible beneath the plywood 21
  • 24. user feedback lessons learned Things we learned from prototyping No major systems were changed, for the main concept of the mechanism worked in practice. The prototype was made of the joints we had on the spot and could make up ourselves, but in the real life, some simple additions like ball bearings on the frame rolls will make it move considerably swifter with l e s s f r i c t i o n w h e n m o v e d f ro m horizontal to seat position. behavioural changes What was beautiful in our discoveries is how the wheely lifts the patient eye height up to almost a regular persons shoulder. This changes the whole experience of being transported around and interacting to people. The patient is no longer at hip height, as they would be in a bed or a wheelchair, but at a more accessible height that other people can more easily communicate with. The behavioural change is evident from the early test.. 22
  • 25. The perfect ward assistant Free wheely works in conjunction with a draw mat, or other patient sliding device, to efficiently slide a patient from the lying position on bed to Free wheely, once there the nurse can release the locks and the patient will be smoothly assume a commanding upright position ready to be moved around the hospital in comfort. Once there the process is reversed to complete a safe transition. 23
  • 26. Lifting patients using the Free wheely to the sitting position (and visa versa) requires almost no effort from the nurses or patients and wheeling it around is just like any other device or baby stroller. Using this device, a patient who may have had to stay in their beds can now be easily transported around the hospital and possibly even outside to benefit from the healing benefits of fresh air and sunshine. Free wheely cushioned seat, faux leather potential ! IV drip post add on leg rest support fixed ! to the frame for stability nurse handle patient hand rest,! thermo treated oak veneers 24
  • 27. 1 237 110° 116° 1970 105° 247 1429 3 2 46 78 684 Preliminary Drawing - Not Issued for production 588 25 46 68 ° ISO drawing method "E" Department of Mechanical Enginnering Drawn: K. Andreitshuk Supervisor Date 13.01.2014 Tallinn University of Technology Sheet 1/1 Mass (Item) 30,382 kg 47,079 kg 7,488 kg Quantity 1 1 1 Scale Weight 1 : 10 84,9 kg FW0001.GA Free Wheelie General Arrangement Drawing Number Title Tolerance u.o.n. ISO 2786-mK Title Vertical Position (1:20) Sitting Position (1:20) Item Number Document Number 1 FW0001.0001 Frame 2 FW0001.0003 Slider 3 FW0001.0002 Handle Material: 1061 155 °
  • 28. 26 1 570 2 25 25 3 110° 25 84,5 62 25 84,5 4 116° 25 1970 25 1770 105° 234,5 184 78 8 7 155 ° 101 880 198 5 25 175 30 44 53 10 9 Quantity 1 1 ABS Plastic, high impact Steel, structural Acrylic, high impact grade SKF Bearing Unit Shaft Bracket SYK-20-TF FW0001.0003.06 FW0001.0003.01 Bolt DIN933 A2 M10x25 Material: 7 8 9 10 Department of Mechanical Enginnering K. Andreitshuk Drawn: Supervisor 13.01.2014 Date Tallinn University of Technology Sheet 1/1 1 Assembly FW0001.0003.03 6 ISO drawing method "E" 3 ABS Plastic, high impact Head Plate FW0001.0003.08 5 FW0001.0003 Free Wheelie Slider Drawing Number Title Tolerance u.o.n. ISO 2786-mK 2 Scale Weight 1 : 10 47,1 kg 1 6 ABS Plastic, high impact Torso Plate FW.0001.0003.05 4 A2 1 ABS Plastic, high impact Shit Plate Hip Plate FW0001.0003.07 Assembly Hinge FW0001.0003.04 2 3 1 8 Material ABS Plastic, medium impact Title Foot Plate Document Number FW0001.0003.02 1 Item Number Preliminary Drawing - Not Issued for production 6 220 136 130 40 1477 659
  • 29. 27 5 4 2 578 67 120° 256 7 8 A A SECTION A-A 10 674 574 11 6 u.o.n. Butt 3 2 2 a3 445 Main Beam Title 3 Shim Right Holder Left Holder Bolt Mid Holder Handle Holder Material: 6 7 8 9 10 11 ISO drawing method "E" Castor 5 Mid Beam Small Leg 2 4 Big Leg 1 Item Number 223 306 266 178 77 Drawn: K. Andreitshuk welds Supervisor Date 13.01.2014 Tallinn University of Technology Preliminary Drawing - Not Issued for production Department of Mechanical Enginnering u.o.n. Corner welds - 120 ° 244,5 60 B 9 1 ,5 243 S355J2R A2 S355J2R S355J2R Plastic AISI316 AISI316 AISI316 AISI316 AISI316 Sheet 1/1 2 32 2 2 4 4 2 2 2 2 Quantity 2 Scale Weight 1 : 10 30,4 kg FW0001.0001 Free Wheelie Frame Drawing Number Title 10 213 Material 117 50 FW0001.0001.02 S355J2R Tolerance u.o.n. ISO 2786-mK FW0001.0001.05 DIN933 A2 M10x25 FW0001.0001.03 FW0001.0001.06 Tente D150 FW0001.0001.07 Tube 50x50x2 FW0001.0001.08 FW0001.0001.01 FW0001.0001.04 Document Number VIEW B 234 419 428
  • 30. 28 3 a3 u.o.n. Butt 1 2 2 2 a3 FW0001.0002.01 3 ISO drawing method "E" Fw0001.0002.03 2 Material: FW0001.0002.02 Document Number 50 1 Item Number 500 Drawn: K. Andreitshuk welds Supervisor Date 13.01.2014 Tallinn University of Technology Preliminary Drawing - Not Issued for production Department of Mechanical Enginnering u.o.n. Corner welds - SECTION A-A a3 653 574 474 20 20 Sheet 1/1 Axis Grip Beam A A S355J2R S355J2R AISI316 FW0001.0002 Free Wheelie Handle Drawing Number Title 1 1 2 Quantity Scale Weight 7,5 kg 1:5 Material Tolerance u.o.n. ISO 2786-mK Title
  • 31. aitäh