Diz protezi aşınma simülatörü tasarım ve imalatı
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Dosyalar
Tarih
2019-11-11
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
İnönü Üniversitesi
Erişim Hakkı
info:eu-repo/semantics/embargoedAccess
Özet
Günümüzde bireylerin diz ekleminde meydana gelen başta kıkırdak yapısı olmak
üzere, trafik kazları ve spor yaralanmaları sonucunda cerrahi operasyonlarda diz
eklem protezleri yoğun olarak kullanılmaktadır. Ancak kullanılan diz protezlerinin
ömürleri tam olarak bilinememektedir. Bu nedenle de diz simülatörlerine ihtiyaç
duyulmaktadır.
Bu çalışmada kullanım esnasında diz eklem protez bileşenlerinden biri olan
UHMWPE (yüksek moleküler yoğunluklu ultra hafif polietilen) bileşeninde meydana
gelen hata durumlarının gözlemlenebilmesi için diz hareketlerini taklit edebilen diz
simülatörünün tasarım ve imalatı gerçekleştirilmiştir. Tasarım ISO 14243
standartında belirtilen hareket varyasyonlarını uygulayabilecek şekilde yapılmıştır.
Çalışmada CAD ortamında modellenen parçaların talaşlı imalat tezgâhlarında üretimi
yapıldı. Daha sonra üretilen parçaların montaj edilme aşaması tamamlandıktan sonra
kullanılan motorlar için PLC ile kontrol çalışmaları gerçekleştirildi. Çalışmanın son
aşamasında ise 100x103, 200x103 ve 300x103 olmak üzere üç farklı çevrim sayısında
testler gerçekleştirildi ve testler sonucunda numuneden mikroskop görüntüleri ve
yüzey pürüzlülük ölçümleri alındı.
Çalışma sonucunda servo motorların esas alınan değerden maksimum %1’lik bir
sapma payı ile konumlarını sağladıkları görüldü. Kullanılan lineer aktüatörlerin
v
hassas bir şekilde hareket edememesinden dolayı standart değerlerinin yerine limit
switchler ile belirlenen mesafeler ile motorlar çalıştırıldı. Eksenel kuvvet için
kullanılan motor 800 N yük ve öne/arkaya hareketi için kullanılan motor ise
maksimum 5.2 mm strok mesafesinde çalıştırıldı. Ayrıca testler sonucunda alınan
mikroskop görüntülerinde çevrim sayısının artması ile yüzeyde oluşan kusurlarda ve
Nowadays, knee joint prostheses are used extensively in surgical operations as a result of traffic accidents and sports injuries, especially the cartilage structure that occurs in the knee joints of individuals. However, the life span of the used knee prosthesis is unknown. For this reason, knee simulators are needed. In this study, the design and manufacture of a knee simulator, which can simulate knee movements in order to observe erroneous conditions in the UHMWPE (ultra high molecular weight polyethylene) component, which is one of the knee joint prosthetic components during use, has been realized. The design was implemented so as to be able to apply the motion variations specified in the ISO 14243 standard. In the study, the parts modeled in the CAD environment were produced on the machining machines. After completing the assembly phase of the produced parts, control works were carried out with PLC for the used motors. In the final phase of the work, three different cycle counts were performed, 100x103, 200x103 and 300x103 and microscope images and surface roughness measurements were taken from the sample as a result of the tests. As a result of the study, it was seen that the servomotors provided their positions with a maximum deviation of 1% from the baseline value. Since the linear actuators used can not move sensitively, the distances and motors determined by the limit vii switches are used instead of the standard values. The motor used for axial force was operated at 800 N load and the motor used for anterior / posterior movement was operated at the maximum stroke of 5.2 mm. In addition, as a result of the tests, it was seen that the increase in the number of cycles in the resulting microscope images led to an increase in surface defects and surface roughness.
Nowadays, knee joint prostheses are used extensively in surgical operations as a result of traffic accidents and sports injuries, especially the cartilage structure that occurs in the knee joints of individuals. However, the life span of the used knee prosthesis is unknown. For this reason, knee simulators are needed. In this study, the design and manufacture of a knee simulator, which can simulate knee movements in order to observe erroneous conditions in the UHMWPE (ultra high molecular weight polyethylene) component, which is one of the knee joint prosthetic components during use, has been realized. The design was implemented so as to be able to apply the motion variations specified in the ISO 14243 standard. In the study, the parts modeled in the CAD environment were produced on the machining machines. After completing the assembly phase of the produced parts, control works were carried out with PLC for the used motors. In the final phase of the work, three different cycle counts were performed, 100x103, 200x103 and 300x103 and microscope images and surface roughness measurements were taken from the sample as a result of the tests. As a result of the study, it was seen that the servomotors provided their positions with a maximum deviation of 1% from the baseline value. Since the linear actuators used can not move sensitively, the distances and motors determined by the limit vii switches are used instead of the standard values. The motor used for axial force was operated at 800 N load and the motor used for anterior / posterior movement was operated at the maximum stroke of 5.2 mm. In addition, as a result of the tests, it was seen that the increase in the number of cycles in the resulting microscope images led to an increase in surface defects and surface roughness.
Açıklama
Anahtar Kelimeler
Diz protezi, Diz simülatörü, Aşınma
