Rifky Ismail

Diponegoro University | UNDIP · Center for Biomechanics, biomaterials, biomechatronics and biosignal processing (CBIOM3S)

The Interference screws are one type of device that is often used in ACL reconstruction surgery. These devices are made of strong materials such as titanium or bioabsorbable materials. However, the use of PMMA (polymethyl methacrylate) as a material for the production of interference screws has not been widely explored. PMMA is commonly used in bio...

Background : Amputation is a loss of body part, and most amputations are lower extremity amputations. The most common is transtibial amputation. After an amputation a person will need a prosthesis. However, up to now there has been no functional prosthesis specifically made for Indonesians who undergo transtibial amputation because the ankle joint...

Smart additive manufacturing (AM) is a complex process that integrates several digital technologies in design, planning, manufacturing, control, and services to make them more responsive and adaptable. Smart AM has demonstrated the ability to provide excellent digital technology for implant, tissue, or organ printing in the medical field. An anteri...

Introduction Targeted Muscle Reinnervation (TMR) is an innovative surgical procedure initially designed for upper-limb amputations, which has shown growing potential for improving functional outcomes in below-knee amputees. TMR involves redirecting severed nerves from the amputated limb to nearby residual muscles, allowing these muscles to act as a...

Kulit manusia memiliki sifat viskoelastik, artinya kulit dapat memanjang ketika ditarik, dan kembali ke posisi semula ketika tarikan dilepas, sifat ini sama dengan sifat elastisitas karet. Karet terus berkembang dan meningkat seiring meningkatnya pertumbuhan kebutuhan alat medis. Karet silikon sebagai kandidat bahan alat latihan suturing/menjahit l...

Table of Contents, Issue 6, Volume 12, Journal of Renewable Materials

Anterior cruciate ligament (ACL) injuries are among the most common knee injuries. Surgery is often needed when an ACL injury occurs to restore function to the knee. One of the most popular techniques for ACL grafts currently is the use of interference screws. This review summarizes the current state-of-the-art interference screw material, manufact...

Brain-computer interface (BCI) has been widely used to capture electrical signals generated from the brain. One of the most commonly used methods in the BCI system is the electroencephalogram (EEG). However, processing brain signals is challenging and requires a lot of computation processes. This study selected single-channel EEG as the input comma...

Everyone agrees that there must be some contact for wear, and extreme contact pressures beyond the yield limit will cause overload damage, making material failure worse. But different pieces of evidence have led to different conclusions for the middle range of contact pressures. Even though there are advanced modeling techniques, many researchers s...

Hand exoskeleton robots have been developed as rehabilitation robots and assistive devices. Based on the material used, they can be soft or hard exoskeletons. Soft materials such as fabric can be used as a component of the wearable robot to increase comfortability. In this paper, we proposed an affordable soft hand exoskeleton based on fabric and m...

Crucibles are critical equipment utilized across numerous industries, and they are notably costly. In this study, the influence of molasses concentrations on the properties of crucibles fabricated from evaporation boat waste products is explored. The evaporation boat waste was powdered and filtered using a 100 mesh sieve. The molasses concentration...

BACKGROUND The four components that make up the current dual-mobility artificial hip joint design are the femoral head, the inner liner, the outer liner as a metal cover to prevent wear, and the acetabular cup. The acetabular cup and the outer liner were constructed of 316L stainless steel. At the same time, the inner liner was made of ultra-high-m...

Table of Contents, Issue 3, Volume 12, Journal of Renewable Materials

Based on several references, Asians carry out several daily activities that are different from Westerners, which require a greater range of motion. Because of that, a dual mobility (DM) implant was created that was adapted to the activities of Asian people. One of the factors that might shorten the life of a hip implant is wear. Simulations of wear...

The main chemical components of waste cow bones are apatite minerals, especially those containing calcium and phosphorus. This study investigated whether this bone could produce extracted hydroxyapatite through calcining at 900° C for different holding times (1-6 h). An average mass loss of 45% occurred in this experiment during the preparation of...

Background: Patients treated in the intensive care unit often experience decreased muscle strength. Continuous muscle weakness will affect muscle condition and have a bad impact and can cause disability. Health workers can use technology to measure muscle strength. Purpose: To examine in depth the technology for measuring muscle strength in critica...

Armour steel products developed in various forms, function and materials. The usage of steel as bulletproof material has many advantages i.e. easy to transport, easy to be formed and has competitive price compared to other material. The mechanical properties of steel which can be used as bulletproof material must meet certain criteria which can be...

Porous structures have shown promise in biomedical applications, particularly for artificial implants, because they provide a large surface area for bone ingrowth. A simulation analysis model was developed in this study to evaluate the mechanical properties of various designs based on cubic unit cell scaffolds with varying strut geometries at the s...

Total knee arthroplasty (TKA) is one of the most successful ways of treating pain and functional limitations due to osteoarthritis. Asians and Middle Easterners need a large range of flexi angles for religious, social, and cultural activities. Prayer activities and seiza required flexible angle from 150° to 165°. To support these activities, a TKA...

This paper experiments with stainless-steel AISI 316L substrate pre-treatment techniques in preparation for hydroxyapatite (HAp) flame spray coating. The mechanical, chemical, and combination pre-treatments were compared for the coating thickness and layer adhesion of the HAp to understand the influence of roughness on the layer adhesion of the fla...

p>Currently, technological developments have been used in several health cases. One technology used for health is a tool to measure the strength of muscle contractions. So far, measuring muscle contractions still uses manual methods, namely the measurement muscle strength test method. Apart from that, health workers also measure manually by feeling...

Creating environmentally friendly materials like polymer matrix composites (PMCs) enhanced with natural fillers has grown in recent decades. It supports the United Nations sustainable development goals (SDGs) by reducing the reliance on non‐renewable resources, minimizing waste generation, and promoting sustainable land and water management practic...

The term “contact area” refers to the total surface area of two entities in direct physical touch. When discussing an artificial hip joint, “contact area” refers to the surface area of contact between the components of the artificial hip joint (ball and cup) positioned inside the patient. Several methods can be used to figure out the contact area o...

The running-in process is considered an essential aspect of the comprehensive wear process. The phenomenon of running-in occurs during the initial stages of wear in the prosthetic hip joint. Within the field of tribology, the running-in phenomenon of the hip joint pertains to the mechanism by which the contact surfaces of the artificial hip joint c...

p>Kaki prostesis merupakan salah satu solusi bagi penderita amputasi kaki. Salah satu bagian kaki prostesis yang penting adalah telapak kaki prostesis yang biasanya terbuat dari elastomer. Saat ini produk telapak kaki prostesis di Indonesia masih didominasi oleh produk impor. Meskipun demikian, produk telapak kaki prostesis juga sudah diproduksi ol...

Additive manufacturing (AM) is a sustainable manufacturing approach because it can lower emissions and have a lower negative impact on the environment. 3D-printed interference screws from poly-lactic acid, eco-friendly filament, by fused deposition modelling (FDM), were fabricated with different process parameters. The most popular technique for re...

This study aimed to determine the effect of preheating AISI 316L metal substrate on the adhesion strength of the hydroxyapatite (HA) layer derived from green mussel shell waste deposit by the flame spray method. The deposition experiment was carried out in a spray gun with a distance of 10 mm with preheat of 200 ° C, 400 ° C, and 600 ° C. A sample...

The use of biogenic waste for multipurpose materials has started to be encouraged in the current decade to support the world’s environmental sustainability campaign. Biogenic calcium phosphate-derived materials are potential biomaterials because of their similar properties to human bone. This paper used hydroxyapatite (HAp) powder derived from gree...

Waste crab shells (CS) have the potential to mineralize CO 2 , yielding precipitated calcium carbonate (PCC) powder feedstock for use in the synthesis of monocalcium phosphate monohydrate (MCPM) in an acidic condition by partial neutralization of phosphoric acid at 90 °C and varying times (30–120 min), followed by evaporation of the water at 100 °C...

Indonesia is the world's second-largest producer of natural rubber. Various products can be made of natural rubber. One of them is a foot prosthesis. An essential criterion for foot prosthesis is a significant value of friction force to prevent slip during usage. The present study optimizes natural rubber formulation to obtain the largest friction...

Mesh model Element size FEA Contact pressure Von Mises Artificial hip joint The Finite element method (FEM) was used to determine the most efficient meshing model and the appropriate element size for finite element analysis of the dual-mobility hip joint. The static simulation was carried out in dry conditions and under a load of 2,332 N, the highe...

The use of composite materials in brake pads is becoming increasingly popular due to their high-performance characteristics, including good thermal stability, high wear resistance, and low noise generation. However, the development of new composite materials that offer even better performance is still an ongoing research area. In this study, the co...

Prosthetics and orthotics research, studies, and technologies have been evolving through the years. According to World Health Organization (WHO) data, it is estimated that, globally, 35–40 million people require prosthetics and orthotics usage in daily life. Prosthetics and orthotics demand is increasing due to certain factors. One of the factors i...

Brake friction materials (BFMs) have a critical role in ensuring the safety as well as the reliability of automotive braking systems. However, traditional BFMs, typically made from asbestos, are associated with environmental and health concerns. Therefore, this results in a growing interest in developing alternative BFMs that are eco-friendly, sust...

This study aims to analyze the problems of nurses in conducting auscultation in the intensive care unit. The research method used is descriptive qualitative research. The results of the study found three main themes found in this study, including 1) the time used for auscultation was minimal due to the large number of nurses' tasks to be completed,...

Multilayered Armor System (MAS) is being extensively studied around the world for its ability to retain ceramic fragmentation after a collision occurs. MAS consist of a ceramic layer placed at the front and supported by a composite layer of ramie-fiber-reinforced epoxy resin. Present study utilizes natural fibers of 50 % ramie fibers with epoxy res...

Background:Examining the heart and lungs is necessary for critically ill patients, as these individuals may have abnormalities with either or both of these organs. This review systematically determined how the auscultation of the heart and lungs using a wireless stethoscope affected the results. Methods: The research design used was a systematic r...

Lower or upper limb prosthetics are a solution for people who have a limited ability to walk due to amputation. One of the most crucial parts of these prosthetics is a prosthetic foot which is usually made of elastomeric materials. The prosthetic foot is a replaceable part that has to be replaced at a particular time due to wear or other damages. T...

Indonesia is a country that has a huge number of people with disability. In 2014, people who have some difficulties in walking are approximately 2.4 million. It can be caused by leg amputation, some degenerative diseases, et cetera. Prosthetic leg is an option for those who are unable to walk due to leg amputation. One of the important parts of the...

Introduction: Examining the heart and lungs is necessary for critically ill patients, as these individuals may have abnormalities with either or both of these organs. This review systematically determined how the auscultation of the heart and lungs using a wireless stethoscope affected the results.

ABSTRAK Latar Belakang: Stetoskop merupakan sebuah alat akustik medis yang biasa digunakan untuk mendengarkan suara-suara yang ada didalam tubuh manusia. Stetoskop telah mengalami sejumlah peningkatan transformatif sejak penemuannya, termasuk pengenalan sistem elektronik dalam dua dekade terakhir. Universitas Diponegoro melalui Pusat Unggulan IPTEK...

The 12-lead EKG is a useful first-line diagnostic tool for detecting cardiovascular diseases, including arrhythmias, conduction abnormalities, and myocardial ischemia or infarction. This scoping review aims to discuss the ECG perspective for detecting heart problems. This study was conducted by following the narrative review and development framewo...

Large amounts of dry solid residues are produced during the extraction of bitumen-rock asphalt, which has the potential to be a calcium of recovery for the development of value-added carbonate minerals via CO2 mineralization. The objective of this research was to use the calcination-dissolution-precipitation (CDP) method to recover calcium sources...

The results of testing the effect of temperature, flow field, heat transfer, and performance by simulating the tapered in-out shape with and without cylinder wall cooling (17 °C). The tapered in-out height variations used in this study are 0.5, 0.75, 1, and 1.25D with diameters De 74 and Dc 148. The fluid flow simulation used the RSM turbulence mod...

Bone disease and fractures are among the health issues that are becoming more prevalent year after year. A mandibular disorder is caused by an accident or disease to the largest and strongest bone in the human face. Because the natural healing process of mandibular bones takes a long time, a bone grafting procedure is used to speed up the patient’s...

This study presents the use of a low-temperature hydrothermal method for extracting calcium sources from green mussel shell (P. Viridis) wastes and converting them into synthetic nanosized hydroxyapatite (HA). In this study, raw mussel shells were washed, pulverized, and sieved to start producing a fine calcium carbonate-rich powder. XRD quantitati...

Patients with lower limb amputation usually use prosthetic feet. Elastomeric material is an important part of prosthetic feet since it can determine their safety and lifetime. The elastomeric material should have high friction for safety, and at the same time it should have low wear for a longer lifetime. This research is aimed to study the optimum...

Bovine bone is a natural resource having valuable calcium phosphate compounds as a potential bioceramics powder feedstock. This study manipulated the calcium phosphates via hydrothermal processes after calcium phosphatecontaining bone was calcined and extracted. Here the resulting powder precursors obtained after calcining at 900 °C for 5 hours wer...

Anterior cruciate ligament (ACL) reconstruction frequently employs the bioabsorbable interference screw, which is 3D printed with biocomposite filaments. The purpose of this research was to construct interference screws using 3D printing filaments (HA, PLA, and PCL) at different nozzle temperatures. In this experiment, nozzle temperatures of 190, 1...

Recently, there has been an increase in the number of studies conducted on the process of developing hydroxyapatite (HA) to use in biocomposites. HA can be derived from natural sources such as bovine bone. The HA usage obtained from green mussel shells in biocomposites in this study will be explored. The research goal is to investigate the composit...

Direct and indirect physical contact of humans and objects become the main medium of transmissible diseases such as COVID-19. Some strategies have been proposed to mitigate the risks of infections by minimizing physical contact, such as using robotics technology. Tele-robotics is one of the sub-fields in robotics that aims to implement physical sur...

Total Knee Arthroplasty (TKA) proposed as an alternative treatment for damaged knee joints of humans is reviewed. The commercial application of TKA can help patients to improve their daily normal activities. Here the high-flex type total knee arthroplasty (High-Flex TKA) is typically designed for the patient’s convenience on which the greater range...

Some of the health issues that are becoming more prevalent each year include bone disease and fractures. Because the natural healing process of bones takes a long time, a bone grafting procedure is required so that the patient’s condition can improve rapidly. Because bone grafting procedures such as autographs, allographs, and xenografts have limit...

The current automotive industry uses composite materials as an alternative material to replace metal or plastic, due to the advantages of composite materials that have biodegradable properties and support environmental sustainability. Composite materials can be used as car body protectors, as a protector composite materials must withstand compressi...

Green mussel shells are one of the calcium carbonate-rich biogenic sources. They contain 95.7 to 98.2 wt. % calcium. The high calcium content of green mussel shells was extracted and converted into calcium oxide material in the study by calcination at 900°C for 5 h. Later, at stirring times of 30, 60, 90, and 120 minutes, a solution medium containi...

In this study, PCC (precipitate calcium carbonate) was synthesized from green mussel shell waste via calcination and subsequent carbonation methods. Organic substances were removed from green mussel shell powder using a 5-hour calcination at 900 °C. Furthermore, the carbonation method was used in the Ca (NO 3 ) 2 solution at constant stirring speed...

Ultra High Molecular Weight Polyethylene (UHMWPE) has been consumed in human hip implants for the last decades. Improving the reliability of hip joint implants can reach by the understanding of wear behavior and morphology of the polyethylene. The purpose of this investigation was to determine the effect of the manufacturing process UHMWPE on the w...