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Air cylinder device for artificial limb

A cylinder device and prosthesis technology, which is applied in the field of bending to generate appropriate resistance, can solve problems such as poor walking feeling of the prosthetic device installer

Inactive Publication Date: 2004-12-08
NABLESCO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the area decreases numerically or in steps corresponding to the movement of the piston, the pressure characteristic of the cylinder also changes stepwise in steps, which deteriorates the walking feeling of the prosthetic device wearer.
In addition, in such cylinders for prostheses, it is necessary to adjust the pressure characteristics of the cylinders for each prosthetic wearer. In the case of a single compression chamber, it is difficult to adjust the pressure characteristics for each wearer as described above.

Method used

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  • Air cylinder device for artificial limb
  • Air cylinder device for artificial limb
  • Air cylinder device for artificial limb

Examples

Experimental program
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Effect test

no. 1 Embodiment

[0039] Figure 7-9 A cylinder device 110 according to a first embodiment of the present invention is shown. In these figures, each figure is consistent with the preceding Figure 1~3 or Figure 4~6 Same, as one of the graph's Figure 7 Represents the state where the knee is extended and the bending angle is zero, as another figure Figure 8 Indicates that the knee is in a slightly bent state, as the rest of the figure Figure 9 Indicates that the knee is in a state of maximum flexion. Also for other embodiments shown later, these three states are represented by drawings respectively.

[0040] The cylinder device 110 includes a cylindrical cylinder body 112 formed of aluminum alloy or synthetic resin. The cylinder main body 112 includes a cylinder liner 112c whose inner diameter is uniform, and a cover portion 112h and a cylinder tube portion 112b that are located at respective ends of the cylinder liner 112c and close the respective ends. Since parts such as a piston ar...

no. 2 Embodiment

[0049] Figures 11 to 13 A cylinder device 2110 according to a second embodiment of the present invention is shown. In this air cylinder device 2110 , a concave portion 2127 is provided on the side of the piston 2113 of the cylinder body 2112 , and a convex portion 2140 fitted into the concave portion 2127 is provided on the side of the cylinder portion 2112b of the cylinder body 2112 . Correspondingly, the first passage 2101 including the first check valve 91 allowing the flow from the first chamber 81 toward the second chamber 82 is provided on the side of the cylinder liner 2112c in the same way as the second passage 2102 which is another communicating passage. in the wall. Also in the cylinder device 2110 of the second embodiment, as in the case of the first embodiment, the throttle valve 140 usually raises the pressure on the side of the second chamber 82 at the stage where the knee bending angle is small, but when it is at a predetermined stage, the second chamber 82 i...

no. 3 Embodiment

[0051] Figures 14 to 16 A cylinder device 3110 according to a third embodiment of the present invention is shown. This cylinder device 3110 has something in common with the case of the second embodiment in that the concave portion 3127 on the side of the piston 3113 and the convex portion 3140 on the side of the cylinder portion 3112b of the cylinder body 3112 are fitted together, and the first passage 3101 and the second passage 3102 is located in the sidewall of cylinder liner 3112c. This embodiment differs from the second embodiment in that the chambers divided by the partition are reversed, and the chamber 3822 newly divided by the partition is located inside the concave portion 3127 of the piston 3113 . Then, the pressure of the newly divided chamber 3822 is increased by the throttle valve 824 , and the pressure of the chamber 3821 on the side periphery of the convex portion 3140 is increased by the throttle valve 140 in normal times. In addition, since the chambers di...

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PUM

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Abstract

There is provided an air-cylinder apparatus for use in a prosthetic limb capable of effectively adjusting the pressure characteristics over a wide range of walking speed. A second chamber (82) defined by a piston (113) is increased in pressure by air confined therein in accordance with the bending motion of the knee. Air is restricted from flowing out of the second chamber (82) by a constant throttle valve 140. In addition, the second chamber (82) is divided into plural chambers (821, 822) in accordance with increase in bending angle of the knee and air is restricted from flowing out of the newly divided chambers by throttle valves corresponding thereto. The division of the second chamber 82 is achieved by mutual engagement between a projection (1140b) on the piston side and a recess (112&) on the bottom part of a cylinder body.

Description

technical field [0001] The present invention relates to an air cylinder device for prosthetics for assisting knee bending and extension, and more particularly to a technique for generating appropriate resistance in response to knee bending when the prosthetic is in a walking swing state away from a contact surface such as a floor. Background technique [0002] The upper leg and the lower leg in the prosthesis swing relative to each other as the knee flexes and extends. Such a prosthetic has a device that assists in bending and extending the knee in order to obtain a walking state (ie, gait) similar to natural walking. As assisting devices, a hydraulic cylinder device and an air cylinder device are well known. Comparing the two assisting devices, since oil, which is the working fluid of the hydraulic cylinder device, hardly compresses, air, the working fluid of the cylinder device, has compressibility. If the cylinder device is used, the compression of the air Compress ener...

Claims

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Application Information

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IPC IPC(8): A61F2/64A61F2/68A61F2/74F15B15/22F16F9/02F16F9/32F16F9/48
CPCF16F2224/046F16F9/486A61F2/644F16F9/48F15B15/223A61F2/64A61F2/68A61F2002/748A61F2002/747A61F2/74A61F2/748
Inventor 中矢贺章富樫勤奥田正彦白石律夫
Owner NABLESCO CORP
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