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WO2011021921A1 - Prothèse mécanique pour avant-bras - Google Patents

Prothèse mécanique pour avant-bras Download PDF

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Publication number
WO2011021921A1
WO2011021921A1 PCT/MX2009/000084 MX2009000084W WO2011021921A1 WO 2011021921 A1 WO2011021921 A1 WO 2011021921A1 MX 2009000084 W MX2009000084 W MX 2009000084W WO 2011021921 A1 WO2011021921 A1 WO 2011021921A1
Authority
WO
WIPO (PCT)
Prior art keywords
forearm
arrow
gear
prosthesis
divided
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/MX2009/000084
Other languages
English (en)
Spanish (es)
Inventor
Luis Armando Bravo Castillo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to PCT/MX2009/000084 priority Critical patent/WO2011021921A1/fr
Publication of WO2011021921A1 publication Critical patent/WO2011021921A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/54—Artificial arms or hands or parts thereof
    • A61F2/58—Elbows; Wrists ; Other joints; Hands
    • A61F2/583—Hands; Wrist joints
    • A61F2/588—Hands having holding devices shaped differently from human fingers, e.g. claws, hooks, tubes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/68—Operating or control means
    • A61F2/70—Operating or control means electrical
    • A61F2002/701—Operating or control means electrical operated by electrically controlled means, e.g. solenoids or torque motors

Definitions

  • the present description relates to the field of human prostheses and more particularly it relates to a forearm prosthesis which can be attached to a hand prosthesis of amputated limbs.
  • Spanish patent 319995 is known, entitled "a forearm prosthesis with mylectric actuation provided with a transistorized amplifier for mylectric currents". It refers to a forearm prosthesis with myoelectric drive equipped with a transistorized amplifier for myoelectric currents. It comprises a plastic housing for fixing to the stump, provided with electrodes to derive myoelectric currents and a friction coupling; It has an amplifier, a circuit that amplifies myoelectric currents, a gear reducer, among others.
  • the present invention comprises a motor for supination and pronation of the forearm regardless of the movement of the fingers; the Spanish patent uses a single engine for the movement of the fingers only; does not provide rotational movement of the forearm.
  • WO 2008155286 Another document that provides a solution for a forearm prosthesis is WO 2008155286, which consists of a forearm rotation mechanism which does not include the structural elements included in the present invention such as miniature motors, components for collecting myoelectric signals, Direct coupling gears, nor the coupled wrist in the manner in which it is achieved in the present invention.
  • the present invention overcomes the above-mentioned drawbacks by providing a simple construction forearm with few elements; provides pronation and supination movements and can be adjusted to the length and diameters required in accordance with the missing part of the human forearm; in other words it fits the user's stump.
  • the invention provides a mechanical forearm that uses myoelectric technology to activate the forearm drive motor.
  • the forearm for its dimensions and construction materials is a lightweight mechanical device that allows a user to carry it without representing a great effort for it.
  • the forearm comprises a motor and a pair of straight gears to perform the turning movement of the forearm and therefore of the wrist and mechanical hands.
  • the forearm is used in cases in which the patient suffered the loss of his limb at the level of half of his forearm or upper, it being possible to attach the electronic forearm described here directly to a socket for amputation at the level of the forearm or to a manual or electronic elbow if it was an amputation above the elbow.
  • the forearm has elements that drive the electrical signals to the motor, which at all times make electrical contact with the mylectric sensors to control the rotation of the forearm.
  • Figure 1 is an upper right isometric view of the forearm attached to the hand.
  • Figure 2 is a top plan view of the forearm attached to the hand.
  • Figure 3 is a right side elevation view.
  • Figure 4 is a rear view, where straight gears and the arrow of communication with guides are appreciated.
  • Figure 5 is an exploded view of the forearm of the present invention and of a hand prosthesis to which it is attached.
  • Figure 6 is a perspective view showing the driver-support of the forearm.
  • Figure 7 is an exploded view of the driver-support.
  • Figure 8 is an exploded view of the split forearm and driver-support assembly.
  • the forearm 1 is a small entity which can be adjusted in length by means of an adapter (not shown), which by one end holds the forearm mechanism and on the other is attached to the user's stump .
  • the forearm 1 comprises a motor 2, coupled to a reducer, a gear 3 coupled to the arrow of this motor 2 ( Figure 4), the gear 3 has a flat EDM to fit the motor arrow, which is a round section truncated with a plane, the gear and the arrow joined by a prisoner, that is, a small notch or indentation is made on the motor shaft and a prisoner is inserted to prevent the gear from sliding horizontally.
  • the gear 4 is placed, which is mounted on the middle communication arrow 5, and is larger in diameter than the gear
  • the middle communication arrow 5 has a common longitudinal axis with the communication arrow with guides 6.
  • a nylon sheath for tracks 7 is placed on which tracks 7a and their spacers 7b are placed.
  • the motor and gearbox are shown in the different figures such as being a single piece since they are thus obtained in commerce.
  • the nylon sheath 7, the tracks 7a and the spacers 7b are contained in the divided forearm, which is divided into two parts: the inner forearm 8 and the outer forearm 9
  • the divided forearm is attached to the wrist 10, by 4 screws, this wrist is attached to the artificial hand 11.
  • the wrist 10 is not an anatomical part of the forearm, it will be included in the present invention because it is the part that connects the forearm 1 with the hand prosthesis 11.
  • the activation of the motor 2 of the forearm is controlled by the tracks 7a, which are connected by means of cables (not shown) to the electronic board that governs the functioning of the prosthesis through the myoelectric stimulation of the patient.
  • the wrist 10 houses a separate motor for the hand prosthesis 11; however, both the design of this wrist and its form of hand grip are new, allowing the union with the hand 11 to be simpler by using only two plates constructed of any metallic or non-metallic material with sufficient mechanical strength such as stainless steel, carbon or alloy steel (treated or not to prevent corrosion), aluminum, plastics, etc. and relatively simple screws.
  • any metallic or non-metallic material with sufficient mechanical strength such as stainless steel, carbon or alloy steel (treated or not to prevent corrosion), aluminum, plastics, etc. and relatively simple screws.
  • Table 1 provides examples of materials used in the described mode and some variants of them.
  • the wrist 10 comprises a central hole ( Figure 5), sized to house a drive motor for the movement of the fingers and four non-equidistant holes distributed on the periphery of the wrist and parallel to this central hole, the object of These four holes is to hold, by means of corresponding screws, the divided forearm.
  • Two screws will be used for the inner forearm 8 and two for the outer forearm 9.
  • the figures illustrate an angled position of the forearm 1 with respect to wrist 10; however, this inclination or angle may not exist and the longitudinal axes of the components of both the wrist and the forearm will be collinear or they can adopt any angle at the request, taste or need of the user without significantly affecting the design and construction of the forearm or its attachment to the wrist.
  • the connecting screws between the wrist and the divided forearm are introduced from the part of the hand, that is, the internal and external forearms 8 and 9 respectively have threaded holes to receive these screws.
  • the divided forearm houses inside a set of elements called conductor-support CS (figures 6, 7 and 8) comprising the middle communication arrow 5, the guide communication arrow 6, the nylon sheath 7, the sheath Nylon together with the tracks 7a and their respective spacers 7b and finally two axial bearings 13 to aid in the rotation of the forearm.
  • the forearm can rotate 360 ° in both directions, in pronation or supination.
  • the divided forearm partially houses the middle communication arrow 5 because this arrow has a portion Dl and a portion D2, Dl has a length on the longitudinal axis of the arrow 5 that is less than the length of D2 in the same direction of Dl (see figures 6, 7 and 8). It is precisely the portion Dl that is housed in the divided forearm.
  • the middle 5 communication arrow also has a internal diameter which is sized to accommodate the communication arrow with guides 6. Once in working position, arrow 5 will follow the movement of arrow 6.
  • the interior of the divided forearm comprises three different diameters Bl, B2 and B3 ( Figure 8).
  • Bl the nylon sheath 7 and the tracks 7a and their spacers 7b are housed.
  • the tracks are preferably made of copper or some similar conductive material such as bronze or silver or electrocoating thereof.
  • a hole is practiced for each of them.
  • These holes serve to introduce in them two conductive cables (not shown) that will transmit the signals coming from the electronic card (s).
  • Each slot in the arrow 6 houses a cable and each cable passes through a hole in the nylon sheath 7 to be held by its respective track 7a, which in turn will come into electrical contact with elements placed in the corresponding holes 16, which will drive the signals to engine 2 and other components in the hand.
  • the forearm divided once armed internally includes the diameters Bl, B2 and B3, the first has been explained, B2, that it is the one of greater magnitude, it is used to accommodate Dl and the two bearings 13.
  • B2 When housing the bearings and Dl, the function of B2 is to support the rotation of the forearm in both axial and longitudinal directions.
  • a table with the construction materials used is provided below.
  • the third diameter B3 is sized so that the diameter D2 of the middle communication arrow 5 passes through it, D2 protrudes from the divided forearm, the object of this projection is to serve as a support for the gear 4 which will be the point of support for the rotation of the forearm-hand set.
  • the gear 3 will rotate and, thanks to the motor being attached to the divided forearm 7, by means of the plate 3a, which in turn allows the passage of four screws that go to the motor 2 and four to the divided forearm , two to the internal 8 and two more screws to the external 9, the whole assembly 2, 3, 8, 9, and the hand 10 will rotate around the gear 4.
  • the gear 3 when the engine is activated, the gear 3 will rotate, around the gear 4, since the gear 4 is integral with the projection 4a, and the projection 4a, in turn fixedly joins the orthopedic copy (no shown), the assembly will use the user's stump as a center of rotation or, if it is an upper amputation, it will revolve around a joint located on the elbow, whether manual or automatic.
  • the activation of The motor will cause the gear 3, the forearm 1 and the hand prosthesis 11 to orbit around the gear 4.
  • the plate 3a is a key part in this movement since it joins, by means of screws, the motor with the external divided forearm.
  • the external divided forearm is attached to the internal divided arm, also by means of screws, and both forearms are joined to the hand 11 by means of the joining plates 12.
  • the gear 4 has a projection 4a (see figures 2, 3 and 5) with an internal diameter and an external diameter, the internal diameter being suitable to rotate tightly around the external diameter of the middle communication arrow 5.
  • the outer diameter of the projection 4a of the gear 4 has a diameter such that it fits an adapter that will be fixed to a copy that joins the socket that will contain the user's stump. In this way, and as explained above, as the stump is a fixed point in the patient's body and when it is fixedly attached to the external diameter of the projection 4a of the gear 4, the gear 4 will remain fixed while the forearm-hand assembly artificial spin around this gear 4.
  • the forearm of the present invention is further characterized by a weight ranging from 185 g and 197 g.
  • This important characteristic imparts a great technical advantage to being a unit of very low weight, so that the movements that the patient carries out with his prosthesis are faster because the load of the
  • the structure has a slight coefficient in relation to the torque developed by the forearm actuator, the power consumption of the motor is minimal and the total load that can be rotated is increased.
  • the total longitudinal is reduced to only 70 mm, which means that it can be adapted to a wide variety of users who have at least 70 mm of amputation above the wrist. Fact that is not reflected in any of the state of the art documents.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Transplantation (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Abstract

L'invention concerne une prothèse mécanique pour avant-bras reliée à une prothèse de main au niveau d'une extrémité et au moignon de l'utilisateur ou à tout autre élément de liaison au corps de l'utilisateur. En outre, cette prothèse se caractérise en ce qu'elle comprend un moteur réducteur et une paire d'engrenages tournant l'un autour de l'autre pour imprimer le mouvement de rotation à l'avant-bras. Les éléments constitutifs peuvent être assemblés à l'aide de moyens de fixation amovibles tels que des vis.
PCT/MX2009/000084 2009-08-19 2009-08-19 Prothèse mécanique pour avant-bras Ceased WO2011021921A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/MX2009/000084 WO2011021921A1 (fr) 2009-08-19 2009-08-19 Prothèse mécanique pour avant-bras

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/MX2009/000084 WO2011021921A1 (fr) 2009-08-19 2009-08-19 Prothèse mécanique pour avant-bras

Publications (1)

Publication Number Publication Date
WO2011021921A1 true WO2011021921A1 (fr) 2011-02-24

Family

ID=43607193

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/MX2009/000084 Ceased WO2011021921A1 (fr) 2009-08-19 2009-08-19 Prothèse mécanique pour avant-bras

Country Status (1)

Country Link
WO (1) WO2011021921A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020134770A1 (fr) * 2018-12-29 2020-07-02 上海科生假肢有限公司 Nouvelle main prothétique passive
US10912662B2 (en) 2018-06-21 2021-02-09 Bionicarm Ltd. Electrically driven artificial arm and method of use

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2580987A (en) * 1948-07-10 1952-01-01 Samuel W Alderson Electrically operated artificial arm for above-the-elbow amputees
ES319995A1 (es) * 1965-06-25 1966-04-16 Istituto Naz Per Lassicurazione Contro Gli Infortuni Una protesis de antebrazo con accionamiento mioelectrico provista de un amplificador transistorizado para las corrientes mioelectricas.
US4094016A (en) * 1976-12-04 1978-06-13 Gary Eroyan Artificial hand and forearm
US4246661A (en) * 1979-03-15 1981-01-27 The Boeing Company Digitally-controlled artificial hand
ES2205555T3 (es) * 1997-10-24 2004-05-01 Touch Emas Limited Protesis de miembro superior.
WO2008088204A1 (fr) * 2007-01-17 2008-07-24 Luis Armando Bravo Castillo Mécanisme de prothèse fonctionnelle pour main

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2580987A (en) * 1948-07-10 1952-01-01 Samuel W Alderson Electrically operated artificial arm for above-the-elbow amputees
ES319995A1 (es) * 1965-06-25 1966-04-16 Istituto Naz Per Lassicurazione Contro Gli Infortuni Una protesis de antebrazo con accionamiento mioelectrico provista de un amplificador transistorizado para las corrientes mioelectricas.
US4094016A (en) * 1976-12-04 1978-06-13 Gary Eroyan Artificial hand and forearm
US4246661A (en) * 1979-03-15 1981-01-27 The Boeing Company Digitally-controlled artificial hand
ES2205555T3 (es) * 1997-10-24 2004-05-01 Touch Emas Limited Protesis de miembro superior.
WO2008088204A1 (fr) * 2007-01-17 2008-07-24 Luis Armando Bravo Castillo Mécanisme de prothèse fonctionnelle pour main

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10912662B2 (en) 2018-06-21 2021-02-09 Bionicarm Ltd. Electrically driven artificial arm and method of use
WO2020134770A1 (fr) * 2018-12-29 2020-07-02 上海科生假肢有限公司 Nouvelle main prothétique passive

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