EP4125637A1 - Instrument médical et procédé permettant de produire un instrument médical - Google Patents

Instrument médical et procédé permettant de produire un instrument médical

Info

Publication number
EP4125637A1
EP4125637A1 EP21715865.8A EP21715865A EP4125637A1 EP 4125637 A1 EP4125637 A1 EP 4125637A1 EP 21715865 A EP21715865 A EP 21715865A EP 4125637 A1 EP4125637 A1 EP 4125637A1
Authority
EP
European Patent Office
Prior art keywords
handle
instrument
proximal
flange
distal
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.)
Pending
Application number
EP21715865.8A
Other languages
German (de)
English (en)
Inventor
Tom Schweitzer
Janina Ackermann
Thomas Schmid
Andreas Deutschendorf
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.)
Aesculap AG
Original Assignee
Aesculap AG
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 Aesculap AG filed Critical Aesculap AG
Publication of EP4125637A1 publication Critical patent/EP4125637A1/fr
Pending legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
    • A61B17/1604—Chisels; Rongeurs; Punches; Stamps
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/0042—Surgical instruments, devices or methods, e.g. tourniquets with special provisions for gripping
    • A61B2017/00424—Surgical instruments, devices or methods, e.g. tourniquets with special provisions for gripping ergonomic, e.g. fitting in fist
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/0046—Surgical instruments, devices or methods, e.g. tourniquets with a releasable handle; with handle and operating part separable
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00477—Coupling
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00526—Methods of manufacturing

Definitions

  • the present invention relates to a medical instrument, in particular a percussion instrument, with a proximal end and a distal end, a handle and a striking surface that transmits in the proximal direction being arranged or formed at the proximal end, a tool element being arranged or formed at the distal end and wherein an instrument shaft of the instrument extends from the proximal end to the tool element.
  • a medical instrument in particular a percussion instrument, with a proximal end and a distal end, a handle and a striking surface that transmits in the proximal direction being arranged or formed at the proximal end, a tool element being arranged or formed at the distal end and wherein an instrument shaft of the instrument extends from the proximal end to the tool element.
  • the present invention relates to a method for producing a medical instrument, in particular a percussion instrument, with a proximal end and a distal end, a handle and a striking surface pointing in the proximal direction being arranged or formed at the proximal end, a tool element at the distal end is arranged or formed and wherein an instrument shaft of the instrument extends from the proximal end to the tool element.
  • a medical instrument in particular a percussion instrument
  • a handle and a striking surface pointing in the proximal direction being arranged or formed at the proximal end
  • a tool element at the distal end is arranged or formed and wherein an instrument shaft of the instrument extends from the proximal end to the tool element.
  • Medical instruments of the type described above are known, for example, in the form of orthopedic instruments. They are used, for example, as percussion instruments in the form of osteotomes, chisels and the like. Due to the use as percussion instruments, there are increased demands on the mechanical stability of the instrument, in particular due to impact, torsional or bending stresses.
  • a problem with such instruments are in particular their handles.
  • solid steel handles are very heavy.
  • Handles that are made of plastic or coated with plastic are usually not durable over a long period of time, taking into account the harsh processing conditions for medical instruments. It is therefore an object of the present invention to improve a medical instrument and a method of the type described at the outset in such a way that the instrument is, in particular, easier to handle.
  • this object is achieved according to the invention in that the handle is designed in the form of a hollow handle.
  • Developing a medical instrument of the type described at the outset in the proposed manner has the particular advantage that the weight of the handle can be significantly reduced, especially when the handle, i.e. the hollow handle, is made entirely of one or more metallic materials is.
  • such an instrument can be designed with a continuous instrument shaft, which is also referred to as the core of the instrument. If the core is made of a metallic material, torsion, bending and impact-resistant instrument shafts can be made so that such an instrument can also be used as a percussion instrument, for example.
  • a striking pulse striking the striking surface can thus be conducted directly through the instrument shaft to the distal end, that is to say to the tool element.
  • a hollow handle is not solid, so that weight can be saved through one or more hollow spaces formed on the handle. This enables a surgeon, in particular, to use the instrument without fatigue over a longer period of time in order to be able to transmit the forces necessary for a surgical intervention.
  • the hollow handle comprises at least one, in particular two, handle shell surrounding the instrument shaft and if a cavity is formed between the at least one handle shell and the instrument shaft.
  • the cavity can in particular be formed in the form of an annular space.
  • a handle shell can be formed from a hollow piece, for example, by so-called hydroforming. Two, three or more Providing handle shells particularly simplifies the manufacture of the instru ment.
  • the at least one grip shell can be permanently connected to the instrument shaft by means of suitable connection methods.
  • the cavity is closed in a gas-tight manner.
  • it can be closed by welding and / or a closure element.
  • a gas-tight sealed cavity prevents impurities from collecting in the cavity.
  • the gas-tight closure makes it possible to improve the cleanability of the instrument.
  • the instrument comprises a ventilation opening which fluidly connects the cavity of the hollow handle with the surroundings of the instrument and if the ventilation opening is closed.
  • the vent opening is sealed gas-tight.
  • a vent opening is particularly advantageous in the manufacture of such an instrument. If the components are first connected to one another and then the entire instrument is subjected to a hardening process at high temperatures, for example around 1000 ° C., the air contained in the cavity can expand due to the heat. This then leads, in particular, to the fact that, for example, ergonomically shaped grip shells of the hollow handle can be deformed in an undesirable manner during hardening due to the gas pressure generated in the cavity.
  • the ventilation opening provides a remedy here. It is closed again ver, in particular after the instrument has hardened, in order to close off the cavity of the hollow handle with respect to the surroundings of the instrument, for example in a gastight manner.
  • the vent opening can be closed in a simple manner with a closure element and / or by soldering or welding. Both an originally provided ventilation opening and the way in which it was closed, for example after the instrument had hardened, can be determined in a simple manner in a ready-to-use instrument, for example by destroying the instrument in the area of the hollow handle. handle. A material penetrating from the outside through the ventilation opening into the cavity of the hollow handle during welding or a closure element can thus easily be detected.
  • the ventilation opening is preferably designed in the form of a bore or a slot on the at least one handle shell. In this way, a defined venting of the hollow handle can be implemented in a simple manner.
  • the ventilation opening is formed by not completely welding the at least one handle shell to the instrument shaft and / or of at least two handle shells to one another.
  • Forming the vent opening in this way has the particular advantage that no additional opening has to be provided, which simplifies the manufacture of the instrument.
  • the closure of the vent opening for example after hardening of the instrument by subsequent welding, can then again be easily demonstrated on the instrument, since this subsequent welding was not subjected to a hardening process and therefore differs in its structure from hardened welds.
  • the manufacture of the instrument can be simplified in particular in that the hollow handle comprises two handle shells which are designed in the form of half shells. In particular, a number of weld seams and a length of the same can be minimized overall.
  • the at least one handle shells have a thickness in a range from approximately 0.5 mm to approximately 2 mm. In particular, they can have a thickness in a range from approximately 0.8 mm to approximately 1.4 mm.
  • the at least one handle shell can be laser cut from sheet metal with a thickness of approximately 1 mm and then brought into a desired shape by deep drawing.
  • a flanged portion can be provided, in particular on the handle shell or shells be provided, which enables the execution of a flanged butt end seam.
  • Such a weld seam geometry makes it possible in particular to dispense with the introduction of additional welding filler material.
  • a proximal handle flange and a distal handle flange spaced therefrom to be arranged or formed on the instrument shaft and for the at least one handle shells to surround the instrument shaft between the proximal and distal handle flange.
  • the instrument shaft penetrates the hollow handle continuously, so that, as described ben, an impact pulse acting on the proximal end of the instrument can be transmitted directly through the instrument shaft, i.e. the core of the instrument, to the distal end and the tool element located there.
  • the two handle flanges also facilitate both the positioning of the at least one handle shell on the instrument shaft and the defined connection of the same to one another and to the instrument shaft.
  • a ring surface which is white in the distal direction is arranged or formed on the proximal handle flange, if an annular surface pointing in the proximal direction is arranged or formed on the distal handle flange if proximal end surfaces of the at least one handle shell pointing in the proximal direction are located on the proximal The gripping flange and when the distal end surfaces of the at least one gripping shell pointing in the distal direction rest against the distal gripping flange.
  • the ring surfaces designed as described enable a defined positioning of the at least one handle shell on the instrument shaft. As a result, they enable a defined and optimal connection of the instrument shaft with the handle or shells to form the hollow handle.
  • a connection between the handle or handles and the handle flanges can be realized by circumferential butt welds using filler metal.
  • the instrument can be designed in a simple manner if the ventilation opening is formed by not completely welding the min least one handle shell to at least one of the two handle flanges. In this way, no additional opening has to be provided on one of the at least two handle shells.
  • the ventilation opening formed in this way can then, for example, be closed by welding after the instrument has hardened.
  • the instrument is made entirely of one or more metallic work materials.
  • the instrument shaft with all of the components formed thereon and also the at least one handle shell can be formed from a metallic material.
  • the metallic material can be the same material as all components.
  • a striking plate is arranged or formed at the proximal end of the instrument and if the striking plate defines the striking surface. In this way, impact impulses can be easily and safely transmitted by a surgeon to the instrument, in particular its instrument shaft.
  • the proximal grip flange is preferably arranged or formed on the striking plate, or the proximal grip flange forms the striking plate. This configuration simplifies the manufacture of the instrument, since the instrument shaft can be designed as a rotating part, particularly in the area of the handle.
  • the instrument is preferably designed in one piece. In particular, it cannot be dismantled without destroying it.
  • the instrument can be made from several components. For example, it can be made from an instrument shaft and two half-shells, which, however, are permanently and permanently connected to one another to form a one-piece instrument that cannot be dismantled, in particular not dismantled for cleaning purposes.
  • Such a one-piece instrument can only be broken down into its original components by irreversible destruction.
  • the instrument shaft comprises a handle part and a tool part and if the handle part and the tool part are non-positively and / or positively and / or cohesively connected to one another.
  • the handle part and the tool part are inextricably linked to one another.
  • This configuration makes it possible, in particular, to combine handle parts and tool parts with one another as desired.
  • instruments can be designed with different tool elements whose handle is shaped identically.
  • differently shaped handle parts for example optimized for left-handers or right-handers, can also be designed, which can then be connected to corresponding tool parts to form a one-piece instrument.
  • handle parts with the hollow handle handles described can be designed in a defined manner, for example different ergonomically shaped or differently sized. Such handle parts can then in particular be produced in stock and are connected to the required tool parts with corresponding tool elements as required.
  • the handle part and the tool part can be permanently connected to one another when they are soldered or welded together.
  • the striking plate and the handle part are formed in one piece. In particular, they can be designed monolithically.
  • the handle part and the proximal handle flange and / or the distal handle flange are formed in one piece.
  • they can be designed monolithically.
  • This refinement can in particular be implemented in that the handle part with the handle flanges is designed as a turned part. In particular, it can be designed to be completely rotationally symmetrical.
  • An ergonomic shape of the handle can then be realized by appropriate design of the at least one handle shell.
  • the instrument comprises a connecting device with a first connecting element and a second connecting element, that one of the two connecting elements is arranged or formed at a distal end of the handle part, that the other of the two connecting elements is arranged or formed at a proximal end of the tool part and that the first connecting element and the second connec tion element are non-positively and / or positively and / or cohesively connected to one another in a connection position.
  • Providing such a connecting device on the instrument has the particular advantage that a standardized connection between the handle part and the tool part is made possible. In this way, differently shaped handle parts with differently shaped tool parts can be coupled with one another in a defined manner and permanently connected. A non-positive and / or positive connection can be achieved, for example, by screwing the connecting elements. Alternatively or additionally, these can be permanently connected to one another by means of a material connection such as soldering or welding.
  • the connecting elements can be of sufficient length in relation to a longitudinal axis of the instrument in the area of the connecting device to form an instrument that is sufficiently torsion and flexurally rigid, which is particularly advantageous for a two-part design of the instrument shaft for stability of the instrument .
  • a ventilation opening is formed on the instrument, which connects the connection receptacle to the surroundings of the instrument in a fluid-active manner, and if the ventilation opening is closed, in particular gas-tight.
  • the ventilation opening can in particular be connected to a cavity of the hollow handle in a fluidically effective manner.
  • the ventilation opening can also be used to vent the cavity, in particular when the instrument is hardening, and to prevent undesired deformation of the at least one grip shell during hardening.
  • the ventilation opening is advantageously formed on the handle part or on the tool part.
  • it can open a longitudinal channel on the tool part on the connecting element of the tool element, which connecting channel is in fluid communication with the cavity of the hollow handle via a cross connection when the tool part and the handle part are connected to one another.
  • the instrument shaft and / or the handle and / or the tool element are made from a stainless steel.
  • all components mentioned can be made from the same steel. This means that no color differences can occur, as is the case when different materials are used.
  • the stainless steel is a chrome steel.
  • it can be a martensitic chromium steel. The risk of damage when the handle is loaded from the side can thus be minimized.
  • the stainless steel is a hardenable steel.
  • the impact resistance of the at least one grip shell can be increased in a number of ways by hardening.
  • the stainless steel is the material 1.4021 according to DIN EN 10088. This material can be shaped into sheet metal in particular and brought into the desired shape by deep drawing. It can also be hardened by heat treatment at around 1000 ° C.
  • the instrument is preferably hardened. Good corrosion resistance can thus be achieved. This can in particular be improved by appropriate surface treatment after hardening.
  • the work tool element comprises a cutting edge pointing in the distal direction.
  • the handling of the instrument can be further improved for a surgeon if the hollow handle is ergonomically shaped. For example, it can be shaped differently to hold for left-handed and right-handed people.
  • the instrument can be in the form of a chisel, a cement removal chisel, an osteotome, a gouge, a dislocation lever, a rupture instrument for prostheses or a pestle.
  • the described Refinements of the instrument enable a wide range of uses where a high impact load occurs and instruments with a very long service life are also to be used.
  • the object set at the beginning is also achieved according to the invention in a method of the type described at the beginning in that the handle is designed in the form of a hollow handle.
  • medical instruments can thus be designed with stable, yet light handles.
  • they make it possible to direct impact pulses directly from the proximal end to the tool element arranged or formed at the distal end.
  • the design of the hollow handle also makes it possible in a simple manner to design ergonomic handles that save material and thus save resources.
  • the hollow handle is formed from at least one, in particular two, handle shells surrounding the instrument shaft and if a cavity is formed between the at least one handle shell and the instrument shaft.
  • the cavity can be designed in the form of an annular space.
  • a handle shell can be formed from a hollow piece, for example, by so-called hydroforming. Providing two, three or more handle shells to form the hollow handle ver simplifies the manufacture of the instrument. In particular, handle shells of this type can be brought up to the side of an instrument shaft and connected to it. The resulting cavity can advantageously save weight in the area of the handle for a user.
  • the cavity is closed in a gas-tight manner.
  • it can be closed by welding and / or a closure element.
  • this ensures optimal cleaning and reprocessing of the instrument, since germs cannot get into or out of the cavity.
  • a ventilation opening is formed on the instrument, which fluidically connects the cavity of the hollow handle with the surroundings of the instrument and that the ventilation opening is closed.
  • it can be sealed gas-tight.
  • the ventilation opening has the particular advantage that when the instrument hardens at high temperatures in the cavity of the hollow handle, no overpressure can arise from air trapped therein, which means that the outer contour of the at least one handle shell does not change in an undesired manner, in particular through deformation can.
  • closing the vent opening as mentioned, it is ensured in particular that no germs can get into the cavity, which enables safe and permanent preparation and use of the instrument.
  • the vent opening can be closed in a simple manner with a closure element and / or by soldering or welding.
  • a gas-tight closure of the cavity can also be achieved in this way.
  • the proposed procedure is favorable, since only a small ventilation opening is required in order to be able to ensure pressure compensation between the cavity and the surroundings of the instrument during hardening at high temperatures. In this way it can be avoided that a large part of any welded or soldered connections are not hardened.
  • the ventilation opening is preferably designed in the form of a bore or a slot on the at least one handle shell. Such vent opening can be produced in a simple manner.
  • the ventilation opening is formed by incomplete welding of the at least one handle shell to the instrument shaft and / or of at least two handle shells with one another.
  • a vent opening formed in this way has in particular the Advantage that no additional work steps are required to train them, for example by drilling or milling.
  • the at least one handle shell can be used completely undamaged or unchanged to form the hollow handle.
  • a proximal handle flange and a distal handle flange spaced therefrom are arranged or formed on the instrument shaft and if the at least one handle shell is arranged surrounding the instrument shaft between the proximal and distal handle flange.
  • annular surface pointing in the distal direction is arranged or formed on the proximal handle flange, if an annular surface pointing in the proximal direction is arranged or formed on the distal handle flange, if End faces pointing in the proximal direction of the at least one grip shell are placed on the proxima len annular flange and when distal end faces pointing in the distal direction are applied to the at least one grip shell on the distal grip flange.
  • the formation of the ring surfaces described enables a defined positioning of the at least one grip shell on the instrument shaft. This also simplifies a connection between the at least one grip shell and the instrument shaft.
  • the ventilation opening can be formed in a simple manner by incompletely welding the at least one handle shell to at least one of the two handle flanges.
  • a weld seam surrounding the instrument shaft in a ring shape for connecting the at least one handle shell to one of the two handle flanges cannot be completely closed.
  • the instrument is made entirely from one or more metallic materials.
  • a uniform coloring of the instrument can be achieved if it is made from a single metallic material. In other words, all components of the instrument can be made from the same metallic material.
  • a striking plate is arranged or formed at the proximal end of the instrument which defines the striking surface.
  • the striking plate can be formed in one piece with the instrument shaft, so that the instrument shaft with the striking plate can be manufactured, for example, as a turned part.
  • the instrument is made in one piece.
  • the instrument shaft is formed from a handle part and a tool part and if the handle part and the tool part are non-positively and / or positively and / or cohesively connected to one another.
  • the handle part and the tool part can be inextricably linked to one another.
  • insoluble means in particular that the parts can only be detached from one another by destroying the instrument as a whole.
  • the instrument shaft can be formed from two parts greater variability in the manufacture of medical instruments, since handle parts and tool parts can be connected to one another as required and in any way. In particular, this can be achieved by a standardized connection between the handle part and the tool part.
  • the proximal handle flange and the distal handle flange are advantageously arranged or formed on the handle part. So the handle part can be formed fully dig with the hollow handle. Such a handle part can then be connected to different tool parts which have different tool ends, for example by welding and / or screwing.
  • the handle part and the tool part can be soldered or welded to one another in a simple and secure manner.
  • the striking plate and the handle part are preferably formed in one piece, in particular monolithically. Such a production can be achieved in particular by forming a turned part. In this way, assembly steps in the manufacture of the instrument can be reduced.
  • the handle part and the proximal handle flange and / or the distal handle flange are formed in one piece, in particular monolithically. So the handle part can be formed from one piece in particular up to the min least one handle shell. Impact pulses can then be transmitted to the tool part in the distal direction via the impact plate through the hollow handle.
  • the instrument is designed with a connecting device which comprises a first connecting element and a second connecting element, if one of the connecting elements is arranged or formed at a distal end of the handle part, if the other of the two Fasteners a proximal end of the tool part is arranged or formed and when the first connecting element and the second connecting element are connected to one another in a connection position in a non-positive and / or form-fitting and / or cohesive manner.
  • a connecting device enables, for example, tool parts with an associated handle to be connected to one another in a defined and standardized manner.
  • any handle parts and any tool parts can be designed with identical connecting elements that allow any combination of handle parts and tool parts and their defined connec tion.
  • the connecting elements can be brought into engagement with one another in a simple manner if the first connecting element is designed in the form of a connecting receptacle and the second connecting element in the form of a connecting projection corresponding to the connecting receptacle.
  • the same manufacturing step for connecting the two parts can always be carried out during manufacture.
  • a ventilation opening is formed on the instrument, which connects the connection receptacle to the surroundings of the percussion instrument in a fluid-effective manner, and if the ventilation opening is closed, in particular gas-tight.
  • the ventilation opening can in particular be closed after the instrument has hardened.
  • a fluid connection to the cavity of the hollow handle can be established via the ventilation opening in order to avoid deformation of the at least one handle shell during hardening as described.
  • the ventilation opening is preferably formed on the handle part or on the tool part. This makes it possible, in particular, to form the ventilation opening where it can be realized most easily in terms of manufacturing technology and also does not impair the stability of the instrument. It is favorable if the instrument shaft and / or the handle and / or the tool element are made from a stainless steel. In particular, a high level of corrosion resistance of the instrument can thus be ensured.
  • a chrome steel is used as the stainless steel.
  • a martensitic chromium steel can be used.
  • Such a chrome steel can be hardened in particular by heat treatment, which helps to further improve the stability of the instrument.
  • a hardenable steel is favorably used as the stainless steel.
  • the stability and service life of the instrument can be further improved in this way.
  • the manufacture of the instrument, in particular the hollow handle can be simplified if the stainless steel material 1.4021 according to DIN EN 10088 is used. Such a material is somewhat less firm than the 1.4301 material at a heat treatment temperature of around 1000 ° C, but after the heat treatment it is significantly harder and therefore less susceptible to undesirable deformations due to a lateral impact load on the hollow handle, in particular the at least one handle shell of the same .
  • the instrument is hardened.
  • grip shells with a reduced thickness in particular can be used. This simplifies the deformation, for example by deep-drawing punched sheets, without ultimately losing any significant or even impact stability in the area of the handle.
  • the instrument is hardened at a temperature of about 1000 ° C.
  • the material 1.4021 can be significantly increased in its impact resistance.
  • the instrument is hardened after connecting the at least egg NEN handle shell to the instrument shaft.
  • the connection between the handle (s) and the instrument shaft is hardened, ie in particular weld seams.
  • the stability and corrosion resistance of the instrument can thus be improved in the desired manner.
  • the ventilation opening and / or the ventilation opening are closed after curing.
  • the openings mentioned no longer have any function after hardening, so that they can be closed to improve the cleanability of the instrument.
  • a uniform appearance of the instrument can in particular be achieved by treating it on the surface. In particular, it can be polished. In particular, with the appropriate choice of a single, uniform material, a uniform appearance can be obtained for all components of the instrument and the occurrence of color differences can be avoided.
  • the surface treatment can be carried out in a simple manner by means of belt grinding. In particular, such a process can also be carried out automatically and automatically.
  • the following description of preferred embodiments of the invention is used in conjunction with the drawings to provide a more detailed explanation. Show it:
  • FIG. 1 a partially broken illustration of a first exemplary embodiment of a medical instrument
  • FIG. 2 a perspective view of a further exemplary embodiment of a tool part
  • FIG. 3 a partially broken perspective view of a further exemplary embodiment of a tool part
  • FIG. 4 a schematic exploded view of an exemplary embodiment of a handle part
  • FIG. 5 a schematic, partially broken view of a further exemplary embodiment of a handle part
  • FIG. 6 a view of the handle part from FIG. 5 in the direction of arrow A;
  • FIG. 7 a partially broken side view of the handle part from FIG.
  • FIG. 8 a schematic perspective, partially open and cut view of the handle part from FIG. 7;
  • FIG. 9 an enlarged view of area C from FIG. 8 during hardening of the handle part
  • FIG. 10 an enlarged view of the area C after hardening with the vent opening closed
  • FIG. 11 a schematic longitudinal sectional view of a further exemplary embodiment of a medical instrument in the area of the handle part;
  • FIG. 12 a sectional view along line 12-12 of the tool part from FIG.
  • FIG. 13 a schematic side view of part of a further exemplary embodiment of a medical instrument.
  • FIG. 14 a view of the handle part from FIG. 13 in the direction of arrow D.
  • FIG. 10 A first exemplary embodiment of a medical instrument 10 is shown schematically in FIG. It is designed in the form of a percussion instrument 14, specifically as a chisel 12.
  • the instrument 10 defines a proximal end 16 from which a handle 20 extends in the distal direction.
  • the proximal end 16 is defined by a striking surface 18 pointing in the proximal direction.
  • An instrument shaft 22 extends from the proximal end 16 to a distal end 24 of the instrument 10, on which a tool element 26 with a cutting edge 28 pointing in the distal direction is formed.
  • the instrument shaft 22 defines a longitudinal axis 30.
  • the handle 20 is designed in the form of a hollow handle 32, the construction of which will be explained in detail below.
  • the instrument shaft 22 comprises a handle part 34 and a tool part 36, which are non-positively, positively and materially connected to one another.
  • the handle part 34 and the work- tool part 36 inextricably linked. Insoluble in this sense means that the handle part 34 and the tool part 36 can only be released from one another by destroying the instrument 10.
  • the tool part 36 is formed in one piece, namely monolithically.
  • the instrument 10 comprises a connection device 38 with a first connection element 40 and a second connection element 42.
  • the first connecting element 40 is formed on a distal end 44 of the handle part 34.
  • the second connecting element 42 is formed on a proximal end 46 of the tool part 36.
  • the first connecting element 40 and the second connecting element 42 are in a connecting position in a non-positive, positive and material-locking engagement with one another or are connected to one another.
  • the first connecting element 40 is designed in the form of a connecting receptacle 48, specifically in the form of a blind hole 50.
  • the second connecting element 42 is designed in the form of a connecting projection 52, specifically corresponding to the connecting receptacle 48.
  • connection receptacle 48 is formed coaxially to the longitudinal axis 30 and is opened pointing in the distal direction.
  • the connecting projection 52 points in the pro ximal direction and can be pushed into the connecting receptacle 48. Both the connection projection 52 and the connection 48 are rotationally symmetrical with respect to the longitudinal axis 30 originallybil det.
  • the connecting projection 52 protrudes from a flange-like stop 54 pointing in the proximal direction and is surrounded by an annular surface 56 defined by the stop 54, which extends transversely, in the exemplary embodiment shown in FIG. 1, perpendicular to the longitudinal axis 30 and points in the proximal direction. It forms a stop for an annular surface 58 pointing in the distal direction, which defines the distal end 44 of the handle part 34.
  • the ring surface 58 is formed on a distal handle flange 60 of the handle part 34.
  • a striking plate 64 is formed which defines a proximal handle flange 66.
  • a side surface of the striking plate 64 pointing in the proximal direction defines the striking surface 18.
  • the proximal handle flange 66 and the distal handle flange 60 are arranged spaced apart from one another or are formed.
  • a recess is formed on the distal gripping flange 60, which defines an annular surface 68 pointing in the proximal direction.
  • an annular surface 70 pointing in the distal direction is formed on the proximal annular flange 66.
  • the instrument 10 comprises several handle shells 72.
  • two handle shells 72 in the form of half shells 74 are provided.
  • the two half-shells 74 surround the instrument shaft 22 in the region of the shaft section 62.
  • a wall 76 defined by the handle shells 72 has a thickness 102 of about 1 mm.
  • the handle shells are laser-cut from a sheet metal blank and brought into the desired ergonomic shape by deep drawing.
  • the half-shells 74 surround the shaft section 62 at a distance, so that a cavity 78 is formed which is delimited by the half-shells 74 in the radial direction away from the longitudinal axis 30, on the proximal side from the proximal handle flange 66 and on the distal side from the distal handle flange 60.
  • the half-shells 74 have proximal end surfaces 80 pointing in the proximal direction and distal end surfaces 82 pointing in the distal direction.
  • the distance between the grip flanges 60 and 66 is dimensioned such that the proximal end surfaces 80 rest on the annular surface 70 of the proximal grip flange 66, and the distal end surfaces 82 on the proximally facing annular surface 68 of the distal grip flange 60.
  • the edges of the half-shells 74 are flanged, that is to say provided with a flange-like flanging 84.
  • the longitudinally extending Ausörde lungs 84 are flat against each other.
  • the flanges, which point in the distal and proximal directions, define the distal end surfaces 82 on the one hand and the proximal end surfaces 80 on the other hand.
  • a cross section of the hollow handle 32 increases in the distal direction, namely continuously up to a maximum that is somewhat closer to the proximal handle flange 66 than to the distal handle flange 60.
  • the cross section increases of the hollow handle 32 continuously down to a minimum cross section, which is closer to the distal handle flange 60 than the maximum to the proximal handle flange 66.
  • the cross section increases again slightly up to to a relative maximum 86 of the cross-sectional area, which is formed near the distal end surface 82.
  • the relative maximum 86 forms a type of slip protection for a thumb of an operator.
  • the handle shells 72 are provided with a plurality of grooves 88 extending in the circumferential direction on the longitudinal axis 30, which have a different length and extend over a circumferential angle relative to the longitudinal axis 30 over a circumferential angle in a range between 60 ° and 150 ° lies.
  • the handle part 34 is designed as a turned part made of the material 1.4021. It is a hardenable, martensitic stainless steel.
  • a ventilation opening 90 in the form of a bore 92 is formed on one of the two half-shells 74 in the area between the relative maximum 86 and the distal end surface 82.
  • the two half-shells 74 are arranged surrounding the handle part 34 between the annular surfaces 68 and 70, so that the flanges 84, which extend in the longitudinal direction, rest against one another, and the flanges 84 defining the end surfaces 80 and 82 on the half-shells 74 bear against the annular surfaces 68 and 70.
  • the handle shells 72 are welded along the flanges 84 with a flanged end seam. Due to this special weld seam geometry, the introduction of additional welding filler material can be dispensed with.
  • the half-shells 74 are connected on the proximal side and distal side with the instrument shaft 22 with circumferential butt seams using welding additive by welding.
  • the tool part 36 is also made from the material 1.4021.
  • the connecting elements 40 and 42 are brought into engagement with one another and the handle part 34 is welded to the tool part 36 in the area of the connecting device 38, namely by a circumferential weld seam in the area of the adjacent annular surfaces 56 and 58.
  • the instrument 10 is thus basically finished in a form as shown schematically in FIG. 1.
  • the instrument 10 which is designed as described by welding its components, is hardened.
  • the vent opening 90 is provided in order to allow the air contained in the cavity 78, which defines an annular space 94, to expand during the hardening process, which is carried out at a temperature of about 1000 ° C.. It prevents the half-shells 74 defining a hollow handle 32, which is essentially oval in cross section, from deforming due to an excess pressure arising in the annular space 94 and thereby approaching a cylindrical outer contour.
  • the vent opening 90 fluidly connects the cavity 78 with an environment 100 of the instrument.
  • the ventilation opening 90 is closed with welding filler material, as is shown schematically in FIG.
  • the filler metal in the vent opening 90 forms a closure element 96 which closes the cavity 78. If all of the weld seams, which are denoted by the arrows 98 in FIGS. 6 and 7, are embodied in a gas-tight manner, the annular space 94 can be closed as a whole in a gas-tight manner by the closure element 96.
  • the closure element 96 is formed by a metal pin which, after the instrument 10 has hardened, is inserted into the ventilation opening 90 and connected to the instrument 10 by welding.
  • the exemplary embodiment of the instrument 10 described is formed entirely from a single metallic material.
  • individual components for example the handle shells 72, can be formed from a different material than, for example, the handle part 34 and the tool part 36.
  • the described embodiment of the instrument 10 is formed in one piece.
  • the described connection of the components of the instrument 10 by means of welding means that it cannot be dismantled. Indivisible here means that a separation into its original components is not possible according to the intended use without destroying the instrument 10.
  • the described embodiment of the instrument 10 has a high impact resistance and also a high corrosion resistance.
  • Schlagim pulses which are exerted on the striking surface 18 with a hammer, for example, are passed through the instrument shaft 22 directly to the tool element 26.
  • an outer surface of the instrument 10 can be surface-treated, for example by grinding or polishing, in particular belt grinding. Such a reworking of the instrument 10 neither protrudes from welding nor annealing colors.
  • the closure element 96 can be designed in particular in the form of a wire pin, which is welded all the way around the upper surface, in particular with one of the handle shells 72.
  • tungsten inert gas welding and laser beam welding are optionally used.
  • FIG. 1 Another exemplary embodiment of a tool part 36 for forming an instrument 10 is shown schematically in FIG.
  • the tool element 26 at the distal end of the tool part 36 is in the form of a narrow chisel Pointed formed with a cutting edge 28 pointing in the distal direction. Since Lich a pin-shaped spacer element 104 is formed on the tool element 26, which has a cylindrical body and a spherical from rounded end 106, which points in the distal direction.
  • the configuration of the tool part 36 from FIG. 2 corresponds to the exemplary embodiment of the tool part 36 from FIG. 1, so that the tool part 36 can be connected to the hollow handle 32 in a manner analogous to that described above for the tool part 36 according to the exemplary embodiment from FIG for forming a medical instrument 10 in the form of a cement removal chisel.
  • FIG. 3 shows a further exemplary embodiment of a tool element 36 for forming a surgical instrument 10.
  • a distal end of the tool part 36 forms a narrow, slightly curved chisel tip which has a cutting edge 28 on the distal side.
  • the tool part 36 from FIG. 3 is designed essentially identically to the proximal end of the tool parts 36 according to the exemplary embodiments in FIGS Longitudinal axis 30 extends, which connects an area 100 of the instrument 10 in a fluidically effective manner with a blind hole 112 which opens the connec tion projection 52 in the proximal direction.
  • the ventilation opening 108 is arranged near a distal end 114 of the blind hole 112.
  • the ventilation opening 108 serves the same purpose as the ventilation opening 90, which was explained above in connection with the hollow handle 32 described in FIGS. 1 and 4 to 11.
  • an opening 116 is formed transversely to the longitudinal axis 30 near a proximal end of the connection receptacle 48 and connects the connection receptacle 48 to the cavity 78 in a fluidically effective manner.
  • the connecting device 38 is designed in such a way that a proximal end 46 of the connecting projection 52 leaves the opening 116 at least partially free, so that when the instrument is hardened after the hollow handle 32 has been connected to a tool part 36 in the cavity 78, expanding air flows through the opening 116, the connection receptacle 48, the blind hole 112 and the ventilation opening 108 can escape into the environment 100.
  • the hollow handle 32 partially shown in FIG. 12 is otherwise identical to the hollow handle shown in FIGS. 1 and 4 to 11.
  • vent opening 90 is not designed in the form of a bore 92, but in the form of a slot 120.
  • the function of a correspondingly arranged slot then corresponds to the function of the bore 92 described above.
  • a slot 120 is shown in dashed lines in the embodiment shown in FIG.
  • a vent opening 90 in the form of a bore 92 already described above there is also the possibility of not completely welding the flanges 84 to one another and to the annular surfaces 68 and 70, but not to a short section at any point of the weld seam to be formed weld. A narrow slot or gap then remains at the point where no weld seam is formed. Such an incomplete weld seam is also suitable for relieve an excess pressure of the air located in the cavity 78 by flowing out into the environment 100 of the instrument 10.
  • FIGS. 13 and 14 a further exemplary embodiment of a medical instrument 10 is shown schematically. It comprises a grip part 34 and a tool part 36 connected to it.
  • the design of the grip part 34 essentially corresponds to the design of the grip parts described in FIGS. 1 and 4 to 12, but differs in the design of the proximal grip flange 66
  • a distance between the annular surface 70 and the striking surface 18 is significantly greater than in the proximal grip flange 66, as is shown and described, for example, in the exemplary embodiment in FIG.
  • the proximal annular flange 66 is provided with a transverse bore 118.
  • the hollow handle 32 of the exemplary embodiment shown in FIGS. 13 and 14 is also produced in a manner analogous to that explained above in connection with FIGS. 1 to 11 and optionally connected to a tool part 36.
  • a vent opening 90 for example in the form of the bore 92 or alternatively in the form of a slot is provided, which are closed after the hardening of the instru ment.
  • a weld seam to form a vent opening 90 is not completely closed here as well. This weld seam is then closed by welding after hardening.
  • a final surface treatment can be carried out by polishing or belt grinding, so that, in particular, subsequent welding work to close the vent opening 90 or the vent opening 108 can no longer be seen from the outside of the instrument 10.
  • a final surface treatment can be carried out by polishing or belt grinding, so that, in particular, subsequent welding work to close the vent opening 90 or the vent opening 108 can no longer be seen from the outside of the instrument 10.
  • one-piece medical instruments with high stability and high corrosion resistance can thus be formed.

Landscapes

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

Abstract

L'invention vise à améliorer un instrument médical, plus particulièrement un instrument de percussion, ayant une extrémité proximale et une extrémité distale, une poignée et une surface de percussion pointant dans la direction proximale qui sont agencées ou formées sur l'extrémité proximale et un élément d'outil qui est disposé ou formé sur l'extrémité distale, et un arbre d'instrument de l'instrument s'étendant de l'extrémité proximale à l'élément d'outil, ladite amélioration permettant en particulier de mieux manipuler l'instrument. À cette fin, il est proposé que la poignée soit conçue sous la forme d'une poignée creuse. L'invention concerne également un procédé permettant de produire un instrument médical.
EP21715865.8A 2020-03-31 2021-03-26 Instrument médical et procédé permettant de produire un instrument médical Pending EP4125637A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020108902.3A DE102020108902A1 (de) 2020-03-31 2020-03-31 Medizinisches Instrument und Verfahren zum Herstellen eines medizinischen Instruments
PCT/EP2021/057874 WO2021198052A1 (fr) 2020-03-31 2021-03-26 Instrument médical et procédé permettant de produire un instrument médical

Publications (1)

Publication Number Publication Date
EP4125637A1 true EP4125637A1 (fr) 2023-02-08

Family

ID=75339745

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21715865.8A Pending EP4125637A1 (fr) 2020-03-31 2021-03-26 Instrument médical et procédé permettant de produire un instrument médical

Country Status (6)

Country Link
US (1) US20230013129A1 (fr)
EP (1) EP4125637A1 (fr)
JP (1) JP2023520000A (fr)
CN (1) CN115605145A (fr)
DE (1) DE102020108902A1 (fr)
WO (1) WO2021198052A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD1029257S1 (en) * 2021-12-03 2024-05-28 Shukla Medical Surgical cement removal tool
USD1029258S1 (en) * 2021-12-06 2024-05-28 Shukla Medical Surgical cement removal tool

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3801676C1 (en) * 1988-01-21 1989-07-06 Aesculap Ag, 7200 Tuttlingen, De Striking tool for surgical instruments
DE102005037504B3 (de) 2004-12-23 2006-08-24 Felo-Werkzeugfabrik Holland-Letz Gmbh Verwendung eines Handgriffes für einen Schraubendreher
US9050062B1 (en) 2011-12-08 2015-06-09 Gauthier Biomedical, Inc. Modular handle construction
DE202013004295U1 (de) * 2013-05-08 2013-06-13 Innovations-Medical Gmbh Einhandwerkzeug für medizinische Zwecke
US20180345464A1 (en) 2017-06-03 2018-12-06 Jason Chang Hand tool

Also Published As

Publication number Publication date
CN115605145A (zh) 2023-01-13
WO2021198052A1 (fr) 2021-10-07
JP2023520000A (ja) 2023-05-15
US20230013129A1 (en) 2023-01-19
DE102020108902A1 (de) 2021-09-30

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