| The operation power device is a necessary appliance in neurosurgery operation, which main function is to deal with the bone tissue in skull and rachis operation by drilling milling grinding and sawing. In recent years, our clinic medicine developed rapidly, especially the advanced aspect in medicine such as neurosurgery development, firstly, the prevalence of neurosurgery operation is improved, (most county hospital can do neurosurgery operation nowadays) secondly, the subtly and complexity of neurosurgery operation improved greatly. Therefore, it will stimulate the greater demand; on the other hand, it will bring forward more requirements of technology and quality in operation power device.From the analysis of practical situation of market, most advanced operation power device depends on import in domestic market. Today, many consumers are still use the traditional apparatus to operate, such as wooden drill and hand-rock drill. It will cause intensive labor force and high risk in operation, meanwhile, the spending of mass foreign exchange is unavoidable, so, it is necessary the current status. In this situation, the author bring forward the research and development of DK Surgical Power Device, and take the key part as the thesis of PH.D.The operation power device is a comparatively complicated system, which involved many technologies such as exactitude machinery transmission, material, soft and hard ware and electric control biomedical. But this essay can't illustrate clearly because of the restriction of space, so, the author choose the flexible shaft, drill handset and reliability of mainframe caloric as the key research objects which have a great affection on the realization of product function and the operation safety.There are two circumstance of the operation power device used in neurosurgery. The first one is open skull, (drilling of skull and cutting), it has a strong requirement of power but lower demand of speed. The second one is the burnishing of bone structure of skull bottom or spinal column, it has a strong requirement of speed but lower demand of power, and the small size of handset. The operation power device can divided into two categories, flexible shaft driving and micro-computer driving, both of the two categories have its own advantages and disadvantages. The flexible driving system adopt the alternating current electric motor, it has a strong power and can satisfied the skull-open operation better, the disadvantages of the system is the lower speed of achievable terminal output (generally less than 20000r/min), and the big size of handset assembly, it cannot satisfied the skull-bottom and spine operation with the requirement of high speed and small size. But the micro-computer driving system is the different one, it has the technical characteristic of high speed and small size, which can satisfied the skull-bottom and spinal operation with the requirement of high speed and small size, but the disadvantages of the system is the lower power (generally only decades tile), which is very difficult to do skull-open operation. The traditional product of operation power device only has one working pattern, therefore, it has difficulties in satisfied the burnishing requirement of skull-open, skull-bottom and spine operation coinstantaneous in clinic applying. So, the demand to develop operation power system which can meet the operation requirement of skull-open, skull-bottom and spine is formed. The author solves the problem commendably by combine the flexible shaft driving system and the micro-computer driving system to one device creatively. The combination of the two ways make it is more complicated in the control of mainframe, and formed a new problem of reliability of mainframe heat. On the basis of research, the problem solved commendably. And as the key parts of the operation power device such as flexible shaft, drill handset and drill bur, the capability of librations, radiation, plasticity, noise, weight and size has a great affection to the function and security of operation power device.On the basis of lucubrating correlation technique of neurosurgery operation power apparatus and the status of product status, integrated biomedical engineering with mechanics, materials science, dynamics, electronics, modern control theory and computer science, this thesis propound two ideas. One is neurosurgery operation power apparatus based on flexible shaft transmission and brushless micromachine drive, the other is actualization of encephalic OPS safety protection based on reliable drilling-out protection, precision OPS, antisepsis and high output torque. Therefore, the task of this thesis is to develop our research turned on the hard cores of operation power apparatus mentioned above, while we will use the modern CAD/CAE technic to accomplish design and circular analysis, improvement.Following is the main R&D work:(1) according to the performance requirement of flexible shaft transmission, detailedly analyzed the dynam and performance of the subassembly, formated dynamics model, profounded the rigidity and the intension of buckling strength, torsion resistant, proposed computational theory of parameter above and finally trial-manufactured up to standard. (2) Adopted finite element method to analyze dyn and static's index of joint construction part such as coupling spindle. Actualize optimal design of transmission attaching parts. (3) Design and optimize the technical proposal of epicyclic gear's transmission system for fulfilling craniotomy requirement of great power. (4) Adopted nonhomogeneous rational B-spline curve approximation technic to construct gear form, Using the geometry methods of structure entity to format parameterized characteristic model of epicyclic gear's transmission system and parts, Applying finite element technic to emulate, analyze and optimize the stress and movements of these important power transmission components. Designed and developed Energizing machines, which have enough intensity, dyn, transfer performance, low noise, stabilization, and of which reduction ratio is 1:6. (5) The power and heat dissipation of host computer's interior electric components are higher, so this thesis adopted finite difference method to research control by volume, numerical simulation analyzing mainframe box's three dimensional structure heat conduction and fluid flow. Optimize parts layout and parameter of fanThrough the research of the key technic above, make DK-2000A operation power apparatus which is the object of this thesis have these nice performance:(1) Integrate great power with micro-power, can synchronously use two power transmittal mode: Flexible shaft driving and micro motor driving. Optimally match the function and the approach, applying to the neurosurgery OPS that require great power for drilling, milling, high-speed polishing and grinding tiny hole. (2) Improving safety performance, the processing of flexible shaft transmission is stable, low noisy. And can be sterilized in the 135℃steam, cranial drilling handle with epicyclic gear transitive mechanics can transfer the more torque, cranial drilling bits can be stop when cranial bones is drilled through. All of these give a guarantee to operation of cranial drilling and the more power.(3)facility of operating and maintenance, all of joint and fixing are finished by hand without special tolls, it is important to emergency treatment for nuerosurgiery and reducing doctor's tiredness and danger. (4) work for 40 minutes without interruption. Utilization ratio is improved because of treating several patents and the more difficult operation.The practice of clinical medicine shows that the mechanical transmission Components of DK-2000A is excellent, secure and stable and suitable to applying to treatment of drilling, milling, grinding for cranial bone in the fields of nuerosurgery and replace imported product. Up to now, all of the mechanical transmission Components has been practiced in clinical medicine. The stability and security of the Components have been fully affirmed by market.
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