Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
  • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
  • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
  • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
  • A61B17/8875—Screwdrivers, spanners or wrenches
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
  • B25B15/00—Screwdrivers
  • B25B15/02—Screwdrivers operated by rotating the handle
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
  • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
  • B25B23/0007—Connections or joints between tool parts
  • B25B23/0042—Connection means between screwdriver handle and screwdriver shaft
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
  • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
  • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
  • B25B23/141—Mechanical overload release couplings
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
  • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
  • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
  • B25B23/142—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
  • A61B90/03—Automatic limiting or abutting means, e.g. for safety
  • A61B2090/031—Automatic limiting or abutting means, e.g. for safety torque limiting
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
  • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
  • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
  • B25B23/142—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
  • B25B23/1422—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters
  • B25B23/1427—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters by mechanical means

Definitions

• the present invention relates to a medical device for dynamometric tightening, such as a screwdriver, for placing and fixing an object, in particular an orthopedic prosthesis, said clamping device comprising a handle, mounted coaxially to the periphery of a rear segment of a central rectilinear shaft, said central rectilinear shaft being rotatable about its axis and carrying a clamping tool at its anterior end, said clamping tool being adapted to said object to be clamped, wherein said medical device
• the dynamometric clamping device is equipped with active mechanical components for transmitting a tightening torque applied to the handle of said clamping tool.
• the present invention further relates to a method of tightening or loosening a medical device for clamping or loosening the screwdriver type, for the establishment and fixation of an object to be clamped, in particular an orthopedic prosthesis , said device comprising a tightening tool or dynamometric loosening, and said torque clamping or loosening tool being adapted to said object to be clamped.
• Dynamometric clamping devices are already known, in particular tools of the screwdriver and torque wrenches type which are produced according to the ratchet design concept, comprising a rotating clamping tool having a faceted wall and having peripheral notches which cooperate with spring balls or the like whose function is to define a tightening torque.
• Dynamometric clamping devices currently used by practitioners have both structural and functional disadvantages. Their realization is complex and, their assembly is long and delicate so that the manufacturing costs are extremely high. As a result, they are part of a tool that the practitioner retains and reuses for multiple applications so that the practitioner must sterilize the instrument, which must be constructed accordingly, with materials capable of withstanding the high temperatures to which they are subjected during successive sterilizations.
• the subject of the present invention is the development of a dynamometric clamping device which strictly complies with the new standards in force and which introduces into the devices concerned a kind of programmed obsoScence, imposed in the context of compliance with safety regulations for the patient. Risky reuse, the automatic removal of the possibility of reuse removes these risks.
• the present invention proposes to overcome all the drawbacks mentioned above by producing a dynamometric tightening or loosening tool, of the screwdriver type, in particular for the insertion of objects such as, for example, orthopedic prostheses.
• a dynamometric tightening or loosening tool of the screwdriver type, in particular for the insertion of objects such as, for example, orthopedic prostheses.
• said medical dynamometric clamping device which is further provided with integrated deactivation means for automatically deactivating said mechanical components configured for transmission of said tightening torque, after having been requested a predetermined number of times, to mechanically couple said gripping sleeve, with said axial rod carrying the dynamometric clamping tool to ensure said torque tightening for the establishment and fixing of said object.
• the predetermined number of times to mechanically couple said handle, with said axial rod corresponds to a predefined number of active coupling of the handle to said axial rod, performed to drive in rotation said clamping tool .
• said integrated deactivation means for automatically deactivating said mechanical transmission components of said tightening torque comprise a first part operably coupled to said grip sleeve and a second part operably coupled to said clamping tool via said axial rod , in that said first piece comprises a first axial displacement member, in that said second piece comprises a second axial displacement member, said first axial displacement member and said second axial displacement member are coupled together, so that axially moving said second piece each rotational movement of said first piece, in order to decouple the handle and said clamping tool, predetermined manner.
• said first part is operatively coupled to said grip handle and is constituted by a tapered section endpiece, a tabular part, housed inside a rigid body integral with said handle, and said second critical operationHernent coupled to said clamping or loosening tool is constituted by an integral threaded annular ring the axial rod carrying the clamping or loosening tool, said first axial displacement member being constituted by a first peripheral thread formed on said tip, said second axial displacement member being constituted by a second complementary peripheral thread formed on the ring ring threaded.
• Said handle is advantageously made of a synthetic material, preferably molded silicone over a rigid body.
• the body is a rigid piece, with an open tubular anterior sector, and having an inner cylindrical cavity, arranged to receive components for transmitting a tightening torque of the handle, to said axial rod and to the clamping tool.
• Said components for transmitting a tightening torque advantageously comprise an at least partially cylindrical tube, grooved internally with longitudinal grooves along its inner wall and housed in said body, a jaw mechanism for coupling said body with said corrugated tube, a fin belt configured to cooperate with said longitudinal grooves for rotating said axial rod in the direction of clamping, provided that the torque threshold is applied to said grip sleeve and to the torque clamping tool does not exceed a predetermined value, and to disengage with respect to said longitudinal splines when the fin belt is rotated in said clamping direction, and the applied torque exceeds said predetermined value.
• Said rigid rod serving as clamping tool holder or dynamometric loosening is advantageously at least partially overmolded with a plastic synthetic material, for example thermoplastic, to form a sleeve.
• Said fin belt is preferably mounted on said sleeve which it is secured.
• said medical dynamometric clamping device is preferably provided with integrated deactivation means for automatically deactivating mechanical components configured for transmission of a tightening torque, dynamometric clamping or loosening tool, after being biased a predetermined number of times, for mechanically coupling said handle to an axial rod carrying the clamping or loosening tool.
• the means for deactivating said handle, with said axial rod carrying the tightening tool or the dynamometric loosening tool comprises a first thread of a threaded endpiece axially movable on a second thread of a peripheral ring mounted on a tubular sector which carries the clamping and unclamping tool, and in that the two threads, shift and move linearly to their disconnection, in a predetermined manner, during. the use of the device for clamping and loosening the medical device.
• Said offset of the two threads is effected after a determined number of turns performed by said clamping device or medical loosening by the handle of said device.
• Said fins are preferably inclined relative to radial directions perpendicular to the axis of the axial rod and have free ends in contact with said longitudinal grooves of the internally splined tube and are configured to engage with the splines, when said tube grooved, is rotated in the direction corresponding to the clamping, and for detaching said grooves, when the applied torque exceeds a predetermined value.
• FIG. 1 represents an external perspective view of the medical dynamometric tightening device according to the invention
• FIG. 2 is an exploded view of the medical dynamometric tightening device of FIG. 1, illustrating the main interior components, FIG. in perspective, partially cut away from the dynamometric tightening medical device of the preceding figures, illustrating some of the main interior components
• FIG. 4A is a sectional view along an axial plane AA, of the medical dynamometric clamping device of FIG. 1, illustrating the main 4A, 4B and 4C are cross-sectional views respectively along the planes BB, CC and DD perpendicular to the longitudinal axis of the medical dynamometric clamping device of the invention
• FIG. perspective similar to that of Figure 3, partially cut away from the medical clamping device Dynamometer of the preceding figures, also illustrating certain interior components.
• the dynamometric clamping device 10 shown is a screwdriver and comprises a gripping sleeve 11, an axial rod 12 associated with said gripping sleeve 11 and arranged to carry, at its free end, a clamping tool. 13, for example in the form of a mouthpiece or a clamping sleeve.
• the handle 11 serves as a tool holder and allows a user to apply a torque on a tool to fix an object.
• the clamping tool 13 is adapted to the intended application, as regards its profile and its dimensions, in particular to ensure the establishment and tightening of orthopedic prosthesis elements.
• the handle 11 consists of a handle 11a, preferably made of a synthetic material, preferably silicone, said handle being obtained by overmolding over a body 14, which is a rigid part, having an open tabular front sector 15, and a cylindrical inner cavity 15a, formed in the tubular former sector 15.
• a tube 16 Inside the body 14, and more precisely within its internal cavity 15a, is housed a tube 16, internally fluted and which is configured to ensure the transmission of a tightening torque, exerted by a user on the clamping handle 11a, and transmitted on the axial rod 12 and the clamping tool 13.
• the corrugated tube 16 is coupled to said body 14 which is it - Even integral with the handle 11a of the handle 11.
• the longitudinal fins 18 are inclined relative to radial directions perpendicular to the axis of the axial rod 12.
• the free ends longitudinal fins 18 are in contact with longitudinal splines 16a of the tabular former sector 16b of the internally splined tube 16 and are configured to engage said splines 16a, when said splined tube 16 is rotated, corresponding to a rotation, the same direction imposed by a user gripping handle 11.
• This hooking occurs when e said first direction of rotation is made on the side where the longitudinal fins 18 are inclined.
• the fin belt 18 is driven and drives the splined tube 16 by hooking the inner splines 16a, then communicates its rotational movement to said axial rod 12 and to the clamping tool 13.
• the splined tube 16 rotates in the opposite direction, namely in opposite to the inclination of the longitudinal fins 18, the latter pass over said grooves 16a, because of their flexibility, without causing said corrugated tube 16.
• the corrugated tube 16 is rotatably connected to the body 14 of the handle 11, to transmit a tightening torque of the handle 11a to the clamping tool, when said handle 11 is mechanically coupled to the axial rod 12.
• the construction of the belt 17 of longitudinal fins 18 and the geometry of the flutes 16a determine a threshold of tightening torque beyond which, the fins can not cling to the flutes 16a and unhook when a tightening torque greater than the threshold is applied. It is this configuration that provides the function of the torque meter of the device 10. This function is known in either
• the coupling between the handle 11 and the corrugated tube 16 must first be provided by ⁇ intermediate grooved tube 16, which is set in motion through the belt 17 of longitudinal fins 18.
• the transmission of torque applied by a user on the handle 11 is performed by means of a jaw mechanism 20 or the like which comprises, as in the present case, for example three hooks 21 in the form of segments in the form of circular arcs integral with the body 14.
• the hooks 21 constituting said jaw are, in operation, in engagement with peripheral recesses 22 formed in a peripheral ring 23 mounted on a rear sector 16c of the fluted tube 16.
• This posterior sector 16c has a diameter less than that of the anterior tubular sector 16b and is extended by an end sector 16d, of reduced section to ensure the cent raging and guiding the corrugated tube 16 relative to the body 14.
• the peripheral ring 23 mounted on a rear sector 16c of the corrugated tube 16 has on its inner surface, a thread 24 spiral, the pitch is predetermined for reasons which will be explained below.
• On said thread 24 is overmolded an end cap 25 of the body 14, in the form of externally threaded bushing, the thread 26 is complementary to said thread 24 and is engaged with it.
• the peripheral ring 23 is connected to the corrugated tube 16 and the end cap 25 is connected to the body 14.
• the two threads 24 and 26 connect the two elements 23 and 25, therefore the corrugated tube 16 and the body 14.
• a rotation of the body 14 causes a linear displacement of the corrugated tube 16.
• the corrugated tube moves the corrugated tube, for example by a fraction of a turn and causes a relative axial displacement of the two elements 23 and 25. hooks 21 catch decreases as and when they come out of the peripheral recesses 22, which has the effect of uncoupling the handle 11 of the axial rod 12 and the clamping tool 13.
• the constructive feature of the instrument 10 is related to its mode of operation which has the particularity to present, what could be called a programmed obsolescence, which makes the instrument automatically becomes inoperative after a predetermined number of rotations performed by the axial rod 12, that is to say after a predetermined use of the instrument.
• the present invention is not limited to the described embodiment, but may be subject to various modifications or variations. Implementations of oNnamometric tightening instruments operating on the same principle, but not including integrated means to limit their use, in order to meet safety criteria equivalent to those of this instrument, could be envisaged. Nevertheless, the present invention stands out from the main instruments known by this constructive specificity of its "that it meets the current requirements of the market.

Landscapes

• Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• Orthopedic Medicine & Surgery (AREA)
• Surgery (AREA)
• Life Sciences & Earth Sciences (AREA)
• Mechanical Engineering (AREA)
• Medical Informatics (AREA)
• Heart & Thoracic Surgery (AREA)
• Biomedical Technology (AREA)
• Molecular Biology (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
• Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=60702247

Family Applications (1)

Country Status (4)

Families Citing this family (4)

Family Cites Families (5)

• 2017
  • 2017-07-03 CH CH00864/17A patent/CH713952A1/fr unknown
• 2018
  • 2018-07-02 EP EP18746070.4A patent/EP3648691A1/de not_active Withdrawn
  • 2018-07-02 WO PCT/CH2018/000028 patent/WO2019006563A1/fr unknown
  • 2018-07-02 US US16/627,833 patent/US20210145497A1/en not_active Abandoned

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