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Actuated leg prosthesis for above-knee amputees

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Actuated leg prosthesis for above-knee amputees


The actuated leg prosthesis comprises a knee member, a socket connector provided over the knee member, an elongated trans-tibial member having a bottom end under which is connected an artificial foot, and a linear actuator. A first pivot assembly allows to operatively connect the trans-tibial member to the knee member. A second pivot assembly allows to operatively connect an upper end of the actuator to the knee member. A third pivot assembly allows to operatively connect a bottom end of the actuator to the bottom end of the trans-tibial member. The prosthesis can be provided as either a front actuator configuration or a rear actuator configuration.
Related Terms: Prosthesis Tibia Socket

Browse recent Victhom Human Bionics, Inc. patents - Quebec, CA
USPTO Applicaton #: #20130035769 - Class: 623 24 (USPTO) - 02/07/13 - Class 623 
Prosthesis (i.e., Artificial Body Members), Parts Thereof, Or Aids And Accessories Therefor > Having Electrical Actuator

Inventors: Stéphane Bédard, Pierre-olivier Roy

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The Patent Description & Claims data below is from USPTO Patent Application 20130035769, Actuated leg prosthesis for above-knee amputees.

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CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of U.S. patent application Ser. No. 11/289,038, filed Nov. 29, 2005, which is a divisional of U.S. patent application Ser. No. 10/463,495, filed Jun. 17, 2003, which claims the benefit of U.S. provisional patent applications No. 60/405,281 filed Aug. 22, 2002; No. 60/424,261 filed Nov. 6, 2002; and No. 60/453,556 filed Mar. 11, 2003, all of which are hereby incorporated by reference.

TECHNICAL FIELD

The present invention relates to an actuated leg prosthesis for above-knee amputees.

BACKGROUND

1. Field

Over the years, many kinds of leg prostheses have been devised in effort to replace the leg or legs that amputees have lost. All these leg prostheses have the difficult task of giving to these amputees a life as normal as possible. The complexity of human locomotion, however, is such that conventional leg prostheses have until now only been using passive mechanisms in the most sophisticated available devices. Conventional leg prostheses are very limited compared to a real human leg and some needs were thus not entirely fulfilled by them.

2. Description of the Related Art

According to amputees, specific conditions of use of conventional leg prostheses, such as repetitive movements and continuous loading, typically entail problems such as increases in metabolic energy expenditures, increases of socket pressure, limitations of locomotion speeds, discrepancies in the locomotion movements, disruptions of postural balance, disruptions of the pelvis-spinal column alignment, and increases in the use of postural clinical rehabilitation programs.

Another problem is that during the amputees\' locomotion, energy used for moving the prosthesis mainly originates from the amputees themselves because conventional leg prostheses do not have self-propulsion capabilities. This has considerable short and long-term negative side effects. Recent developments in the field of energy-saving prosthetic components have partially contributed to improve energy transfer between the amputees and their prosthesis. Nevertheless, the problem of energy expenditure is still not fully resolved and remains a major concern.

A further problem is that the dynamic role played by the stump during the amputees\' locomotion renders difficult the prolonged wearing of conventional leg prostheses. This may create, among other things, skin problems such as folliculitis, contact dermatitis, oedema, cysts, skin shearing, scarring and ulcers. Although these skin problems may be partially alleviated by using a silicon sheath, a complete suction socket or powder, minimizing these skin problems remain a concern.

Considering this background, it clearly appears that there was a need to develop improved leg prosthesis for above-knee amputees.

SUMMARY

OF THE INVENTION

In accordance with a first broad aspect of the present invention, there is provided an improved actuated leg prosthesis comprising a knee member, first means for connecting a socket over the knee member, an elongated trans-tibial member, second means for connecting an artificial foot under a bottom end of the trans-tibial member, a linear actuator, third means for operatively connecting the trans-tibial member to the knee member, fourth means for operatively connecting the upper end of the actuator to the knee member, and fifth means for operatively connecting the bottom end of the actuator to the bottom end of the trans-tibial member.

In accordance with another broad aspect of the present invention, there is provided an improved actuated leg prosthesis comprising a knee member, a socket connected over the knee member, an elongated trans-tibial member, an artificial foot connected under a bottom end of the trans-tibial member, and a linear actuator. A first pivot assembly allows to operatively connect the trans-tibial member to the knee member. The first pivot assembly defines a first pivot axis that is perpendicular to a main longitudinal axis of the trans-tibial member. A second pivot assembly allows to operatively connect an upper end of the actuator to the knee member. The second pivot assembly defines a second pivot axis that is substantially parallel to the first pivot axis. The second pivot axis is also spaced apart from the first pivot axis and the main longitudinal axis. A third pivot assembly allows to operatively connect a bottom end of the actuator to the bottom end of the trans-tibial member. The third pivot assembly defines a third pivot axis that is substantially parallel to and spaced apart from the first pivot axis.

These and other aspects of the present invention are described in or apparent from the following detailed description, which description is made in conjunction with the accompanying figures.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an actuated prosthesis with a front actuator configuration, in accordance with the preferred embodiment of the present invention.

FIG. 2 is a partially exploded perspective view of the prosthesis shown in FIG. 1.

FIG. 3 is an exploded perspective view of the knee member and the first pivot assembly shown in FIG. 1.

FIG. 4 is an exploded view of the trans-tibial member and the third pivot assembly shown in FIG. 1.

FIG. 5 is a partially exploded view of the linear actuator and the second pivot assembly shown in FIG. 1.

FIG. 6 is a diagram illustrating the geometrical model with the front actuator configuration.



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Industry Class:
Prosthesis (i.e., artificial body members), parts thereof, or aids and accessories therefor
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stats Patent Info
Application #
US 20130035769 A1
Publish Date
02/07/2013
Document #
13540342
File Date
07/02/2012
USPTO Class
623 24
Other USPTO Classes
International Class
61F2/70
Drawings
12


Prosthesis
Tibia
Socket


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