Yurube T.,Kobe University |
Sumi M.,Kobe Rosai Hospital |
Nishida K.,Kobe University |
Takabatake M.,Kobe Rosai Hospital |
And 7 more authors.
Spine | Year: 2011
Study Design.: A 5-year prospective cohort study of cervical spine instabilities in rheu matoid arthritis (RA). Objective.: To clarify the natural course of cervical instabilities in RA patients and to determine predictors for the prognosis of RA cervical spine. Summary of Background Data.: Although several previous studies investigating the natural history of RA cervical spine have been reported, few of them have described radiological predictive factors for the aggravation of these instabilities. Methods.: Two hundred sixty-seven outpatients with "definite" or "classical" RA initially assigned were prospectively followed for over 5 years. Radiographic cervical findings were classified into three representative instabilities: atlantoaxial subluxation (AAS), vertical subluxation (VS), and subaxial subluxation (SAS). The aggravations of these instabilities were identified in the cases with a decrease of at least 2 mm in the Ranawat value of VS, an increase of at least 1 mm in translation of SAS, or a new development of respective instabilities. RA stages and mutilating changes were assessed in the hand radiograms. Results.: Fifty-two point four percent of 267 patients, without any cervical instability at the beginning of follow-up, decreased to 29.6% at the end (P < 0.01), whereas VS and SAS increased significantly (P < 0.01). The aggravation of VS was observed at statistically higher rates in patients with pre-existing instabilities as follows; 25.7% of AAS (P = 0.01), 49.1% of VS (P < 0.01), and 41.2% of SAS (P = 0.06). The aggravation of SAS was also detected in 47.2% of VS and 64.7% of SAS (P < 0.01). Patients with pre-existing mutilating changes exhibited the aggravations of VS and SAS in significantly higher incidences (P < 0.01). Furthermore, the cases with development into mutilating changes during the follow-up showed significantly higher tendencies for the aggravations of these instabilities (P < 0.01). Conclusion.: The incidences of VS and SAS significantly increased during the minimum 5-year follow-up. Prognostic factors of these instabilities were revealed to be the initial radiological findings of VS, SAS, and mutilating changes. © 2011 Lippincott Williams & Wilkins.
Hara Y.,Hyogo Assistive Technology Research and Design Institute |
Matsubara H.,Hyogo Assistive Technology Research and Design Institute |
Shibata Y.,Hyogo Rehabilitation Center |
Mizobe F.,Hyogo Rehabilitation Center |
And 5 more authors.
Electronics and Communications in Japan | Year: 2010
The aim of this study was to develop a new evaluation method for controlling skill of a myoelectric control hand (MCH). Four amputees who daily used the MCH participated in this study. Measurement of two signals which were needed to control motion of the MCH was made. The two signals were assigned as the average rectified electromyograms of the forearm extensors and flexors. The values of the signals increased depending on the muscle contraction level. Therapy for using the MCH was performed to improve the ability to produce separate contractions of two muscles. This ability was defined as the skill in controlling the motion of the MCH. The skill in each motion was evaluated by the regression coefficient, which was calculated by the least squares method. The regression coefficient was inversely proportional to the skill. A quantitative index of skill can be provided by the newly developed method, and should be useful in developing efficient therapy to improve the skill in controlling the MCH. © 2010 Wiley Periodicals, Inc.
Shibanoki T.,Hiroshima University |
Shima K.,Hiroshima University |
Takaki T.,Hiroshima University |
Kurita Y.,Hiroshima University |
And 3 more authors.
2012 ICME International Conference on Complex Medical Engineering, CME 2012 Proceedings | Year: 2012
This paper introduces a motion and channel selection method based on a partial Kullback-Leibler (KL) information measure. In the proposed method, the probability density functions of recorded data are estimated through learning involving a probabilistic neural network based on the KL information theory. Partial KL information is defined to support evaluation of the contribution of each dimension and class for classification. Effective dimensions and classes can then be selected by eliminating ineffective choices one by one based on this information, respectively. In the experiments, effective channels for classification were first selected for each of the six subjects, and the number of channels was reduced by 32.1 ± 25.5%. After channel selection, appropriate motions for classification were chosen, and the average classification rate for the motions selected using the proposed method was found to be 91.7 ± 2.5%. These outcomes indicate that the proposed method can be used to select effective channels and motions for accurate classification. © 2012 IEEE.
News Article | March 1, 2017
MINNEAPOLIS & REHOVOT, Israel--(BUSINESS WIRE)--Stratasys Ltd. (Nasdaq:SSYS), the 3D printing and additive manufacturing solutions company, today announced that its multi-material, multi-color PolyJet 3D printing technology has enabled Ben Ryan, founder of Ambionics, to create a fully-functioning 3D printed hydraulic prosthetic for his two year old son, Sol. Researching infant development with prosthetics, Ben Ryan has developed a unique prosthetic for infants to wear, enabling a more natural acceptance of prosthetic arms for young children. An unparalleled innovation within this sphere of the medical field, the customized design and production of the 3D printed hydraulic prosthetic has delivered cost savings of up to 76%, as well as time savings in design and production of 90%, compared to traditional methods of manufacture. This crucially permits prosthetics to be used at an earlier developmental stage. When Ben’s son, Sol, was born in March 2015, complications resulted in the amputation of his lower left arm. Although able to keep approximately one inch of his lower arm, Sol would have to wait three years for a myoelectric prosthetic from the NHS*, and one year before a cosmetic, non-functional prosthesis would be fitted. Ben saw his son losing responsiveness and acceptance of his left arm, and decided to act. Having undertaken extensive research into infant development, Ben saw that higher rejection rates occur when children are fit after the age of two years** and that early fitting of functional devices correlates with continued prosthetic use throughout childhood. Another study*** also found that children fitted before two years of age tend to accept their powered prosthesis more than those fitted after two years. With this in mind, Ben first designed a foam arm for his son, and later a hydraulic prosthetic, enabling Sol to move his thumb on his own. Ben designed and created his 3D printed hydraulic prosthetic arm on the Stratasys Connex 3D Printer. First practicing with prototypes of his design, Ben 3D printed flexible actuators and a power-splitting unit (double acting helical bellow or DAHB) for the prosthetic. According to Ben, the DAHB unit enables the wearer to open and close the thumb in manual mode or with assistive power (using compressed air or a hydraulic pump and reservoir), but the grip continues to operate manually in the event of power interruption. “The success of my patented DAHB mechanism draws on the advanced capabilities of the Stratasys Connex Printer – the ability to combine rigid and soft materials in a single print was vital to the success of the design,” explains Ben. “We were fortunate enough to have access to this technology, which enabled us to 3D print a prototype arm so quickly and cost-effectively. In founding Ambionics, it’s now my goal to ensure that other limb deficient children like my son are not faced with the current constraints and delays of traditional prosthetic manufacture.” To develop the design for the prosthetic, Ben relied on the use of Autodesk Fusion 360. “This is a very innovative and ambitious project and it’s been inspiring to work with Ben on it,” says Paul Sohi, a product design expert at Autodesk. “It is amazing that despite Ben having no real background in product design, he’s effectively taught himself enough to create something that will not only help his own son Sol, but in Ambionics, potentially others facing the same challenges too.” As well as its lightweight 3D printed design that weighs less than traditional myoelectric alternatives, the hydraulic prosthetic is body-powered and enables infants to grow accustomed to their “arm” earlier than traditional fittings. The ability to operate without the need for any electronic devices or batteries is unique to the Ambionics design and mitigates the risk of injury. Scan of the arm to wearable prosthetic in just five days While the NHS takes 11 weeks to convert the plaster cast of the arm into a wearable prosthetic, Ben Ryan was able to produce the prosthetic in only five days. With the flexibility to keep the scan on file, the digital copy allows replacement prosthetics to be easily produced through 3D printing. “Essentially the entire prosthetic is 3D printed,” Ben adds. “Only Stratasys’ strong rubber-like and dissolvable support 3D printing materials make production and use of the DAHB units possible. The internal cavities are complex and it would be impossible to remove the support material using mechanical means. The materials must also be strong yet flexible as they are used to transmit fluid pressure to operate the grip.” Having patented its DAHB technology inside the prosthetic, Ambionics is aiming to offer the service to healthcare providers worldwide. Continuing its research and testing into infant development with prosthetics, the company is starting a Crowdfunding campaign on March 1st to enable medical device usability trials, which are required before seeking authorization to launch the product into the market. “This case is indicative of 3D printing’s ability to improve lives by overcoming the traditional barriers of low-volume manufacturing,” says Scott Rader, General Manager, Healthcare Solutions, Stratasys. “We continue to support and enable innovators like Ben to bring customization to mainstream prosthetics manufacture,” he concludes. ***Toda M, Chin T, Shibata Y, Mizobe F (2015) Use of Powered Prosthesis for Children with Upper Limb Deficiency at Hyogo Rehabilitation Center. PLoS ONE 10(6): e0131746. doi:10.1371/journal.pone.0131746 For more than 25 years, Stratasys Ltd. (NASDAQ:SSYS) has been a defining force and dominant player in 3D printing and additive manufacturing – shaping the way things are made. Headquartered in Minneapolis, Minnesota and Rehovot, Israel, the company empowers customers across a broad range of vertical markets by enabling new paradigms for design and manufacturing. The company’s solutions provide customers with unmatched design freedom and manufacturing flexibility – reducing time-to-market and lowering development costs, while improving designs and communications. Stratasys subsidiaries include MakerBot and Solidscape, and the Stratasys ecosystem includes 3D printers for prototyping and production; a wide range of 3D printing materials; parts on-demand via Stratasys Direct Manufacturing; strategic consulting and professional services; and the Thingiverse and GrabCAD communities with over 2 million 3D printable files for free designs. With more than 2,700 employees and 1200 granted or pending additive manufacturing patents, Stratasys has received more than 30 technology and leadership awards. Visit us online at: www.stratasys.com or http://blog.stratasys.com/, and follow us on LinkedIn. Stratasys, Stratasys signet logo, Connex and PolyJet are trademarks or registered trademarks of Stratasys Ltd. and/or its subsidiaries or affiliates. Autodesk and Fusion 360 are trademarks of Autodesk Inc. and/or its subsidiaries and/or affiliates. Attention Editors, if you publish reader-contact information, please use:
Chin T.,Hyogo Rehabilitation Center |
Chin T.,Kobe University |
Toda M.,Hyogo Rehabilitation Center
Journal of International Medical Research | Year: 2016
Objective: To investigate the effect of a standardized silicone liner programme on the duration of prosthetic rehabilitation in patients who underwent transtibial amputation as a result of peripheral arterial disease. Methods: This retrospective study enrolled patients who underwent transtibial amputation followed by one of two stump management programmes at the same rehabilitation centre over a period of 14 years. The study compared the duration of rehabilitation following a standardized silicone liner programme compared with that following a conventional soft dressing programme. Results: This study included 16 patients who underwent the silicone liner programme and 11 patients who underwent the soft dressing programme. There were no significant differences between the two groups in age, sex, interval between amputation and admission to the rehabilitation centre and stump length. The duration required for the completion of the rehabilitation programme was significantly shorter for the silicone liner programme compared with the soft dressing programme (mean ± SD: 77.3 days ± 13.4 versus 125.4 days ± 66.4 days, respectively). Conclusion: A standardized silicone liner programme reduced the duration of rehabilitation and could be a valuable replacement for soft dressing-based stump management. © 2016, © The Author(s) 2016.
Toda M.,Hyogo Rehabilitation Center |
Chin T.,Hyogo Rehabilitation Center |
Chin T.,Kobe University |
Shibata Y.,Hyogo Rehabilitation Center |
Mizobe F.,Hyogo Rehabilitation Center
PLoS ONE | Year: 2015
Background: There has been no research investigating the use of powered prosthetic for children in Japan. Objective: To gain better insight into the state of powered prosthesis usage and identify a ratio of rejection among children. Methods: Subjects were 37 unilateral below elbow amputees between the ages of 0 and 16 at the time of their first experienced fitting with a powered prosthesis at our Center. The information was collected from medical records and through face-to-face interviews, and we examined rejection rate and the factors affecting the use of powered prosthesis. Results: The rate of discontinuation was 21.6% as 8 of the 37 children stopped using powered prosthesis. All of them were fitted their prosthesis after 2 years of age, and they rejected prosthesis between 5 to 19 years. We found that the level of amputation had no influence on the use of a powered prosthesis. Conclusions: Children fitted before 2 years of age tend to accept their powered prosthesis than those fitted after 2 years. Multidisciprinary team approach, adequate rehabilitation, detailed followup and involvement of parents are quite important for introducing powered prosthesis for children. © 2015 Toda et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Matsumoto T.,Kobe University |
Kubo S.,Kobe University |
Muratsu H.,Steel Memorial Hirohata Hospital |
Matsushita T.,Kobe University |
And 9 more authors.
Knee Surgery, Sports Traumatology, Arthroscopy | Year: 2013
Purpose: In order to permit soft tissue balance under more physiological conditions during total knee arthroplasties (TKAs), an offset-type tensor was developed to obtain soft tissue balancing throughout the range of motion with reduced patello-femoral (PF) and aligned tibiofemoral joints. The main purpose of the present study was to assess intra-operative soft tissue balance using a navigation system with the offset-type tensor in both cruciate-retaining (CR) and posterior-stabilized (PS) TKAs. Methods: One hundred and twenty TKAs-80 CR and 40 PS-were performed in patients with varus-type osteoarthritis using a computed tomography-free navigation system. The offset-type TKA tensor with a reduced and repaired PF joint and femoral component in place was used with the tibia first gap technique to balance soft tissues (joint component gap and ligament balance) at 0°, 10°, 30°, 60°, 90°, and 120° of flexion. The achievement in equalized rectangular gap at extension and flexion-joint component gap within ±3 mm between extension and flexion and ligament balance within ±3° at extension and flexion-was assessed retrospectively. Results: Both types of implants showed similar patterns of soft tissue balance throughout the range of motion, whereas PS TKA had larger values especially at 60° or 90° of flexion than did CR TKA. In the achievement of equalized rectangular gaps at extension and flexion, CR TKA was superior to PS TKA. Conclusion: Using the tibia first gap technique with the tensor allows appropriate soft tissue balancing, especially in CR TKA. Level of evidence: Therapeutic studies, Level II. © 2013 Springer-Verlag Berlin Heidelberg.
PubMed | Kobe University and Hyogo Rehabilitation Center
Type: Journal Article | Journal: The Journal of international medical research | Year: 2016
To investigate the effect of a standardized silicone liner programme on the duration of prosthetic rehabilitation in patients who underwent transtibial amputation as a result of peripheral arterial disease.This retrospective study enrolled patients who underwent transtibial amputation followed by one of two stump management programmes at the same rehabilitation centre over a period of 14 years. The study compared the duration of rehabilitation following a standardized silicone liner programme compared with that following a conventional soft dressing programme.This study included 16 patients who underwent the silicone liner programme and 11 patients who underwent the soft dressing programme. There were no significant differences between the two groups in age, sex, interval between amputation and admission to the rehabilitation centre and stump length. The duration required for the completion of the rehabilitation programme was significantly shorter for the silicone liner programme compared with the soft dressing programme (meanSD: 77.3 days13.4 versus 125.4 days66.4 days, respectively).A standardized silicone liner programme reduced the duration of rehabilitation and could be a valuable replacement for soft dressing-based stump management.