EP4561473A1 - Vorrichtung zum betätigen eines marknagels, umfassend ein adapterstück, set zur bereitstellung einer solchen vorrichtung, adapterstück, sowie adapterset - Google Patents
Vorrichtung zum betätigen eines marknagels, umfassend ein adapterstück, set zur bereitstellung einer solchen vorrichtung, adapterstück, sowie adaptersetInfo
- Publication number
- EP4561473A1 EP4561473A1 EP23764562.7A EP23764562A EP4561473A1 EP 4561473 A1 EP4561473 A1 EP 4561473A1 EP 23764562 A EP23764562 A EP 23764562A EP 4561473 A1 EP4561473 A1 EP 4561473A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- adapter piece
- distal end
- actuating
- intramedullary nail
- shaft
- 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
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- 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 or setting implements
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/72—Intramedullary devices, e.g. pins or nails
- A61B17/7208—Flexible pins, e.g. ENDER pins
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- 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 or setting implements
- A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
- A61B17/8872—Instruments for putting said fixation devices against or away from the bone
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- 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 or setting implements
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/72—Intramedullary devices, e.g. pins or nails
- A61B17/7233—Intramedullary devices, e.g. pins or nails with special means of locking the nail to the bone
- A61B17/7258—Intramedullary devices, e.g. pins or nails with special means of locking the nail to the bone with laterally expanding parts, e.g. for gripping the bone
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B2017/00367—Details of actuation of instruments, e.g. relations between pushing buttons, or the like, and activation of the tool, working tip, or the like
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B2017/00477—Coupling
Definitions
- the invention initially relates to a device for actuating an intramedullary nail according to the preamble of claim 1.
- the invention then relates to a device for actuating an intramedullary nail, wherein the intramedullary nail is suitable for internal stabilization and/or fixation of an elongated hollow body, in particular a bone, which extends in an axial longitudinal direction and has a proximal end and a distal end, and an elongated Has spring element which is wound in a helical shape starting from the proximal end and based on the longitudinal direction, the radial expansion of the wound spring element being able to be reduced by tensioning the spring element in the winding direction and being increased by relaxing the spring element against the winding direction, whereby the proximal end of the intramedullary nail has a nail head in which a proximal end of the spring element is anchored in an anchor element, the anchor element having an engagement region for a device for actuating an intramedullary nail, and wherein by engaging and rotating the anchor element with such a device, the Spring element can be tensioned and relaxed, wherein the device for
- the invention further relates to an adapter piece according to claim 14, a set consisting of an above-mentioned device and an adapter piece according to claim 15, and an adapter set according to claim 16.
- Simpler intramedullary nails for interlocking nailing are known, but their installation during an operation can only be controlled by means of intraoperative X-ray imaging, which is stressful not only for a patient but especially for the operating room staff due to the duration. Furthermore, such simple intramedullary nails must be secured in the bone using cross screws, which requires complex aiming devices, particularly in the case of long thigh bones, but also in the upper arm and lower leg bones, in order to be able to place such cross screws precisely through the skin with as little damage as possible. These surgical wounds, which are additionally introduced into an extremity, have to be treated in a complex manner after an operation, but also after the cross screws have been surgically removed, which entails additional stress for a patient.
- an intramedullary intramedullary nail is known, in particular for the closed reduction of a fracture of a long bone by inserting it into a hole in its medullary cavity, which is comparatively simple in structure and can be used easily, quickly and safely with only little use of intraoperative X-rays without requiring intervention in intact areas of an extremity.
- the intramedullary nail has a nail core, on the front area of which a head piece is provided, on which the beginning of a band is fixed, which is wound around the nail core, and which is fixed at the end in the rear area in a rotationally lockable manner around the nail core, and which When rotating against its winding direction, the radial contour of the intramedullary nail expands.
- Another intramedullary nail is known from WO 2015/117996 A1, namely an arrangement for the internal stabilization and/or fixation of an elongated hollow body, in particular bone such as a long bone or a prosthesis, with a stabilizing element with an elongated first element having a helical course, its proximal end with a first fastening supply element is connected, and from the distal end of which a second element extends, which is connected to a second fastening element in the area of the first fastening element, the first element and the second element preferably merging into one another without connection as sections of the stabilizing element, thereby ensuring that the first fastening element cannot be rotated to the second fastening element, the outer fastening element forming the first fastening element fixes the inner fastening element forming the second fastening element in a clamping manner.
- a tool for tensioning a spring element of such an intramedullary nail, namely to reduce its cross section in order to be able to insert it into the medullary cavity, as well as for relaxing the spring element in order to be able to clamp the spring element in the inserted state relative to the inner surface of the medullary cavity, and last but not least for Handling the intramedullary nail both during implantation and explantation requires a tool, which is referred to here as a device for operating an intramedullary nail.
- WO 2015/117996 A1 already mentioned in relation to an intramedullary nail, further shows a device for the opposite rotation of two, in particular helical, elements of an arrangement for internal stabilization, the device having a holding section with a first hollow cylinder section, preferably with a first handle, the first Hollow cylinder section coaxially surrounds a second hollow cylinder section and a wave-shaped or hollow cylindrical inner section.
- This publication also shows a device of the type mentioned at the beginning.
- a disadvantage of the known devices for actuating an intramedullary nail is the insufficient variability.
- the device that is tailored to it must be used.
- intramedullary nails with different diameters namely depending on the age and gender of the patient, and of course especially depending on the type of bone to be treated.
- Either a large number of different devices must be purchased and maintained, or the device currently required is not immediately available.
- An interaction of known devices for actuating an intramedullary nail with different intramedullary nails of different diameters has not yet been possible.
- the present invention is based on the object of overcoming the disadvantages resulting from the prior art.
- the object is to provide a device for actuating an intramedullary nail, with which different intramedullary nails of different sizes or different diameters can be actuated.
- An adapter piece according to the invention is the subject of claim 14.
- a set according to the invention consisting of a device mentioned at the beginning and an adapter piece according to the invention is the subject of claim 15.
- a set according to the invention consisting of a first outer adapter piece and a second inner adapter piece is the subject of claim 16.
- the generic device is designed and further developed in such a way that an adapter piece is arranged between the distal end of the actuating shaft and the distal end of the device, which is non-rotatably connected to the engagement area of the actuating shaft at the distal end of the actuating shaft is connected, and which has an engagement area at the distal end of the device, which is complementary to an engagement area of the anchor element of an intramedullary nail that can be arranged opposite.
- the present invention thus creates a device for actuating an intramedullary nail, which can be used for intramedullary nails, in particular double helix intramedullary nails, of different sizes.
- the device which is only available to the user once, can be adapted to any intramedullary nail geometry very quickly and cost-effectively by quickly exchanging comparatively inexpensive adapter pieces.
- the device according to the invention for actuating an intramedullary nail is suitable, among other things, for the intramedullary nails disclosed in the aforementioned patent documents.
- the or at least one actuating shaft of the device extends in a longitudinal direction and has a proximal end and a distal end.
- a central axis of an actuating shaft preferably coincides with the longitudinal axis.
- the distal end of the or at least one adapter piece coincides with the distal end of the device.
- An intramedullary nail that can be arranged oppositely can be coupled directly with the engagement area of its anchor element to the complementary engagement area of the adapter piece, or vice versa.
- the device has two actuating shafts for indirectly actuating two spring elements of an intramedullary nail that can be arranged opposite one another.
- the two spring elements of double helix intramedullary nails can be operated or held independently of one another.
- each actuating shaft there is an adapter between the distal end of each actuating shaft and the distal end of the device. rear piece arranged. This can affect devices with one, two or more actuating shafts.
- two actuating shafts can be arranged concentrically within the device.
- a first, outer actuating shaft is designed as a sleeve and a second, inner actuating shaft is designed as a shaft rotatably mounted therein.
- the adapter piece or at least one of the existing adapter pieces extends in the longitudinal direction and has a proximal end and a distal end.
- the adapter piece or at least one of the existing adapter pieces extend in this way.
- the central axis of an adapter piece can coincide with the longitudinal axis.
- two adapter pieces are preferably provided in the device, in particular the two adapter pieces are arranged concentrically.
- a first, outer adapter piece is designed as a sleeve, and a second, inner adapter piece is designed as a shaft rotatably mounted therein.
- the distal end of a second adapter piece is preferably passed through the proximal end of a first adapter piece.
- a first, outer adapter piece can preferably be designed with a widened, hollow cylinder-like proximal end.
- the bottom of the hollow cylinder can serve as a distal stop for a second, inner adapter piece.
- a second, inner adapter piece can preferably be designed with a widened, cylinder-like proximal end, with a widening of a first adapter piece serving as a stop for a widening of the second adapter piece. This can prevent the inner adapter piece from falling out of the device in the distal direction.
- the distal end of an actuating shaft can have a radially extending pin, and the proximal end of an adapter piece can also have a radially extending groove which is non-rotatably fixed in the pin can intervene. Or, viewed the other way around, the pin can engage in the radial groove of the adapter piece, comparable to the tip of a screwdriver.
- Such a configuration is particularly preferred when pairing a second, inner actuating shaft with a second, inner adapter piece.
- the distal end of the actuating shaft can preferably be designed like a hollow cylinder, and the pin can be arranged on the bottom of the hollow cylinder.
- the pin can be inserted into two opposite holes in the wall of the hollow cylinder, running above the bottom of the hollow cylinder.
- the proximal end of an adapter piece may include a radially extending pin
- the distal end of an actuating shaft may include a radially extending groove which non-rotatably engages the pin
- the distal end of the or at least one actuating shaft has an axially extending groove
- the proximal end of the or at least one adapter piece has an axially extending feather key which engages in the groove in a rotationally fixed manner.
- Such a configuration is particularly preferred when pairing a first, outer actuating shaft with a first, outer adapter piece.
- the proximal end of an adapter piece may have an axially extending groove
- the distal end of an actuating shaft may include an axially extending key which non-rotatably engages the groove.
- an adapter piece can have an external thread at the distal end.
- This is preferably a first, outer adapter piece.
- a threaded sleeve can be arranged on the external thread of an adapter piece, which can be screwed onto the nail head of an intramedullary nail that can be arranged opposite.
- the nail head or the proximal end of a suitable intramedullary nail can also have a corresponding external thread.
- an actuation shaft in particular an external actuation shaft, has an external thread.
- an adapter piece in particular an outer adapter piece, can preferably be fixed in or on the actuation shaft by a union nut screwed onto the distal end of the actuation shaft.
- a union nut can in a further advantageous manner in particular define a suitable widening or a shoulder of the adapter piece in the distal direction.
- An adapter piece, in particular an external adapter piece, can thus be fixed to the device.
- This adapter piece can then in turn advantageously hold a second, inner adapter piece, in particular as in a manner already described above.
- An actuating element of the device according to the invention can preferably be designed as a handwheel.
- the center of an actuating element in particular a handwheel, preferably coincides with the longitudinal axis of the device.
- two axially spaced actuating elements are provided, with a distal actuating element being assigned to an outer actuating shaft, and a proximal actuating element being assigned to an inner, in particular coaxial, actuating shaft.
- proximal actuation element with the inner actuation shaft can further preferably be rotatable relative to the distal actuation element with the outer actuation shaft.
- the inner actuating shaft preferably acts on the inner spring element of a coupled double helix intramedullary nail.
- a lock can be adjustable for any desired direction of rotation. Only one direction of rotation, ie tensioning or relaxing of the spring element in question, can be permitted in the operation of a pawl system.
- a ratchet function is particularly advantageous when tensioning a double helix spring, preferably via the inner spring element, in order to then be able to insert it into the medullary canal with a reduced diameter.
- a ratchet function can reliably prevent the spring from unintentionally relaxing.
- a ratchet mechanism required for this can preferably be arranged in the distal actuating element.
- the proximal actuation element can be rotated relative to the distal actuation element.
- the engagement area at the distal end of an adapter piece has: axially extending recesses, projections, teeth, tines, serrations, or several thereof. In this respect, a secure positive fit can be established with the corresponding engagement areas of a coupled intramedullary nail.
- the engagement region is formed at the distal end of an adapter piece within an external thread or integrally with an external thread of the adapter piece.
- the distal end of such an adapter piece can thus simultaneously serve to transmit a torque to the intramedullary nail as well as to axially couple an intramedullary nail by means of a threaded sleeve.
- a threaded sleeve of an adapter piece and/or a union nut of an actuating shaft is/are coated, in particular with a titanium nitride coating. Such a coating prevents seizing or cold welding of adjacent parts.
- an adapter piece and an associated actuating shaft are made of different materials. This measure also serves to prevent seizing of corresponding neighboring parts. Different types of stainless steel are preferably used for this purpose.
- An adapter piece of the device according to the invention is preferably hardened in order to increase resilience and service life. However, if wear occurs, adapter pieces can be replaced easily and inexpensively Conventional devices require extensive repairs or even complete replacement.
- the adapter set in a first preferred embodiment, it additionally has a threaded sleeve for the distal end of the first adapter piece and a union nut for the proximal end of the first adapter piece.
- the set can preferably contain at least two sets of a first outer adapter piece and a second inner adapter piece, namely each with a different extent of the distal ends, for connection to intramedullary nails with different diameters.
- a device can therefore be used to operate a wide variety of intramedullary nails with different diameters with minimal effort.
- a set can contain adapter pieces for connecting to different intramedullary nails, e.g. adapter pieces for an intramedullary nail diameter of 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, or several of these, or all of them of this.
- FIG. 1 shows a perspective view of an intramedullary nail, for the actuation of which the device according to the invention is suitable
- Figure 2 is a side sectional view of a preferred embodiment of the device according to the invention for actuating an intramedullary nail
- Figure 3 shows the corresponding side view of the device from Figure 2
- FIGS. 4 shows a side sectional view at the top and a plan view at the bottom of the first, outer actuating shaft of the device from FIGS. 2 and 3
- 5 shows a top view at the top and a side sectional view at the bottom of the second, inner actuating shaft of the device from FIGS. 2 and 3
- FIGS. 6 shows a top view at the top and a side sectional view at the bottom of the first, outer adapter piece of the device from FIGS. 2 and 3,
- Figure 7 is a side view of the second, inner adapter piece of the device from Figures 2 and 3,
- Figure 8 is a perspective view of the device from Figures 2 and 3, seen from the distal end,
- FIG. 9a is a perspective detailed view which illustrates the approach and coupling of the distal end of the device according to the invention from FIGS. 2, 3 and 8 to the proximal end of a suitable intramedullary nail according to FIG. 1,
- Figure 9b shows a representation as in Figure 9a, but after the parts have been coupled
- Figure 10 is a perspective view, seen from the side, of a set according to the invention for providing the device according to the invention from FIGS. 2, 3 and 8, and
- Figure 11 shows a schematic, side view of a device according to the invention with a set of adapter sets according to the invention for actuating intramedullary nails, each with a different intramedullary nail diameter, with the otherwise same device.
- Fig. 1 shows the perspective view of an intramedullary nail 1, for the actuation of which the device according to the invention for actuating an intramedullary nail 1 is suitable.
- the representation of this intramedullary nail 1 serves here for a further understanding and a further illustration of the teaching according to the invention.
- the intramedullary nail 1 shown is the subject of German utility model application 20 2021 106 260.6, now published as DE 20 2021 106 260 Ul, by the present applicant.
- the figures there along with character descriptions Exercise are hereby incorporated by reference into the present description of the figures.
- the intramedullary nail 1 comprises a covering element 10 and a nail core 100.
- the nail core 100 is no longer relevant in the present case, namely for the actuation of the intramedullary nail 1.
- the covering element 10 is also referred to below as an intramedullary nail 1.
- the intramedullary nail 1 is intended for internal stabilization and/or fixation of an elongated hollow body, in particular a bone. It extends in a longitudinal direction L and has a proximal end 12 and a distal end 14.
- the intramedullary nail 1 comprises a substantially cylindrical interior 16, wherein an outer contour of the intramedullary nail 1 seen perpendicular to the longitudinal direction L has an elongated spring element 18, which is wound in a helical course starting from the proximal end 12 and with respect to the longitudinal direction L.
- the radial expansion of the wound spring element 18 can be reduced by tensioning the elongated spring element 18 in the winding direction, and can be increased by relaxing the elongated spring element 18 against the winding direction.
- the spring element 18 essentially obscures the view of the interior 16.
- the outer contour of the intramedullary nail 1 is essentially formed by the coiled spring element 18.
- the spring element 18 is wound in the form of a three-dimensional spiral, and here in particular in the form of a cylindrical spiral.
- the diameter of the intramedullary nail 1 can be reduced by tensioning the spring element 18. This is done in particular in order to be able to insert the intramedullary nail 1 into the medullary canal.
- the intramedullary nail 1 can also be braced by expanding its outer contour, namely by relaxing the spring element 18, relative to the inner wall of an elongated hollow body to be stabilized, in particular in the medullary canal of a long bone.
- the intramedullary nail 1 has not only one spring element 18, but two elongated spring elements 18, 1018 arranged one above the other. on, which are each wound in a helical course relative to the longitudinal direction L of the intramedullary nail 1.
- a second spring element 1018 runs within the spring element 18 or also the first spring element 18.
- the two spring elements 18, 1018 arranged one above the other form a three-dimensional double spiral, namely a double helix.
- the two spring elements 18, 1018 arranged one above the other are wound in opposite directions compared to each other and consist of a continuous element which merges from the first spring element 18 into the second spring element 1018 at the distal end 14.
- the proximal end 12 of the intramedullary nail 1 has a nail head 20. Both the proximal end of the first spring element 18 and the proximal end of the second spring element 1018 are anchored to the nail head 20. Furthermore, the nail head 20 has an axial opening 22 for inserting the nail core 100.
- the proximal end of the first spring element 18 is anchored in a first anchor element 24.
- the first anchor element 24 can also be referred to here as an outer anchor element 24; it is an outer sleeve 26.
- the proximal end of the second spring element 1018 is anchored in a second anchor element 1024.
- the second anchor element 1024 can also be referred to here as an inner anchor element 1024; it is an inner sleeve 28.
- the securing sleeve 30, which is arranged on the very outside, secures the anchoring of the outer, first spring element 18 on the first anchor element 24, i.e. on the outer sleeve 26.
- the securing sleeve 30 also obscures the further view of this area.
- the inner sleeve 28 can be rotated relative to the outer sleeve 26.
- the spring element 1018 By rotating the inner sleeve 28 in the winding direction of the second spring element 1018, the spring element 1018 is tensioned and thus, with the outer sleeve 26 held in place or even rotated in the opposite direction, it also tensions the first spring element 18 via the distal transition into the first spring element 18.
- the diameter of the intramedullary nail 1 decreases.
- the second spring element 1018 By rotating the inner sleeve 28 against the winding direction of the second spring element 1018, the second spring element 1018 is relaxed and thus also relaxes the first spring element 18 via the distal transition into the first spring element 18. For this purpose, it may be sufficient to use the previously applied torque for tensioning of the second spring element 1018 from the inner sleeve 28.
- the second spring element 1018 can then possibly relax automatically and thereby rotate the inner sleeve 28 against the winding direction.
- the outer spring element 18 can rest against the inside of the medullary canal.
- the inner spring element 1018 can also rest against the inside of the first spring element 18 in order to stabilize and secure it.
- the outer spring element 18 can be tensioned and the diameter of the intramedullary nail 1 can thus be reduced, and vice versa.
- the inner sleeve 28 should then be held in place or even actuated in the opposite direction.
- the axial opening 22 in the proximal end 12 of the intramedullary nail 1, namely in the nail head 20, can also be seen. Seen from the inside out, the nail core 100 is surrounded by the inner sleeve 28, the outer sleeve 26 and the securing sleeve 30.
- the interrupted design of the outer sleeve 26 as seen in the circumferential direction provides a first engagement region 32 in the first anchor element 24.
- the interrupted design of the inner sleeve 28 as seen in the circumferential direction provides a second engagement region 1032 in the second anchor element 1024.
- Both engagement areas 32, 1032 are formed in the form of axially extending teeth and provide useful engagement areas 32, 1032 for complementary engagement areas of an oppositely arranged device according to the invention for actuating an intramedullary nail 1.
- a device according to the invention for actuating an intramedullary nail 1 for each spring element 18, 1018, a possibility of engagement is provided for a device according to the invention for actuating an intramedullary nail 1, namely for tensioning or relaxing the spring elements 18, 1018 of the intramedullary nail 1.
- Fig. 2 shows a side sectional view of a preferred embodiment of the device 200 according to the invention for actuating an intramedullary nail 1
- Fig. 3 shows the corresponding side view of this device 200.
- the device 200 for actuating an intramedullary nail 1 extends in the axial longitudinal direction L and has a proximal end 202 and a distal end 204.
- a first, outer actuation shaft 300 is assigned to a first, distal actuation element 400.
- the outer actuating shaft 300 extends in the longitudinal direction L between a proximal end 302 and a distal end 304, and has at its distal end 304 an engagement region 306 for engaging and rotating or holding a complementary counterpart thereto.
- a first, outer adapter piece 500 is arranged, which is non-rotatably connected to the engagement region 306 of the actuation shaft 300 at the distal end 304 of the outer actuation shaft 300.
- the adapter piece 500 includes a proximal end 502 and a distal end 504 and extends therebetween in the longitudinal direction L, namely between the distal end 304 of the actuating shaft 300 and the distal end 204 of the device 200.
- the outer adapter piece 500 points at the distal end 204 of the Device 200 has an engagement area 506, which is complementary to an engagement area 32 of the anchor element 24 of an intramedullary nail 1 that can be arranged opposite.
- the device 200 has two actuating shafts 300, 600 for indirectly actuating two spring elements 18, 1018 of an intramedullary nail 1 that can be arranged opposite one another.
- the two actuating shafts 300, 600 are arranged concentrically.
- a second, inner actuation shaft 600 is assigned to a second, proximal actuation element 700.
- the inner actuating shaft 600 extends in the longitudinal direction L between a proximal end 602 and a distal end 604, and has at its distal end 604 an engagement region 606 for engaging and rotating or holding a complementary counterpart thereto.
- a second, inner adapter piece 800 is arranged, which is non-rotatably connected to the engagement region 606 of the actuation shaft 600 at the distal end 604 of the inner actuation shaft 600.
- the second, inner adapter piece 800 extends with a proximal end 802 and a distal end 804 in the longitudinal direction L between the distal end 604 of the actuating shaft 600 and the distal end 204 of the device 200.
- the inner adapter piece 800 points at the distal end 204 of the device 200 has an engagement area 806, which is complementary to an engagement area 1032 of the anchor element 1024 of an intramedullary nail 1 that can be arranged opposite.
- an adapter piece 500, 800 is arranged here between the distal end 304, 604 of each actuating shaft 300, 600 and the distal end 204 of the device 200.
- Two adapter pieces 500, 800 are therefore provided here, the adapter pieces 500, 800 being arranged concentrically.
- the first outer actuation shaft 300 is designed as a sleeve and the second, inner actuation shaft 600 as a shaft rotatably mounted therein. Furthermore, the first, outer adapter piece 500 is designed as a sleeve, and the second, inner adapter piece 800 is designed as a shaft rotatably mounted therein.
- the distal ends 504, 804 of the adapter piece 500, 800 with the respective engagement areas 506, 806 essentially coincide with the distal end 204 of the device 200.
- Each engagement area 506, 806 of the adapter pieces 500, 800 has axially extending recesses or projections, which can be referred to as teeth 518, 812.
- teeth 518, 812. The respective engagement between the actuating shafts 300, 600 and the respectively assigned adapter piece 500, 800 is explained below.
- the distal end 604 of the second, inner actuation shaft 600 is provided with a radially extending pin 608. This forms the engagement region 606.
- the opposite proximal end 802 of the second, inner adapter piece 800 has a radially extending groove 808, which can engage in the pin 608 in a rotationally fixed manner.
- the second adapter piece 800 can thus be pushed onto the distal end 604 of the second, inner actuation shaft 600, or vice versa, and the groove 808 engages around the pin 608, thereby creating a rotationally fixed but axially releasable coupling between the inner actuation shaft 600 and the inner adapter piece 800 is made.
- the distal end 304 of the first, outer actuating shaft 300 has an axially extending groove 308 as the engagement region 306, and the proximal end 502 of the first, outer adapter piece 500 has an axially extending feather key 508, which engages in the groove 308 in a rotationally fixed manner.
- the assembly of the inner actuation shaft 600 and the inner adapter piece 800 remains rotatable relative to the assembly of the outer actuation shaft 300 and the outer adapter piece 500.
- the inner adapter piece 800 is inserted with its distal end 804 through the proximal end 502 of the outer adapter piece. This assembly is then inserted into the distal end 304 of the outer actuating shaft 300 so that the keyway 508 and groove 308 and groove 808 and pin 608 couplings are produced.
- the distal end 304 of the first, outer actuation shaft 300 also has an external thread 310, and after being inserted into the distal end 304, the two adapter pieces 500, 800 can be screwed onto the external thread 310 in or on the actuation shaft 300 establish.
- the outer adapter piece 500 also has an external thread 510 at its distal end 504 in addition to the engagement area 506.
- a threaded sleeve 512 is screwed onto the external thread 510.
- the threaded sleeve 512 can be screwed over in a particularly advantageous manner when coupling an intramedullary nail 1 to the device 200 onto a matching external thread in the nail head 20 or an outer sleeve 26 of an intramedullary nail 1.
- the spring element 18, 1018 of the intramedullary nail 1 can be actuated with the device 200, but also the Intramedullary nail 1 can also be handled in a particularly advantageous manner with the device 200 during implantation or explantation, since it can be securely and firmly secured to the device 200 in the axial direction L.
- the first, distal actuating element 400 is designed as a handwheel 402 and the second, proximal actuating element 700 is designed as a handwheel 702 spaced therefrom.
- the center of each handwheel 402, 702 coincides with the longitudinal axis L.
- the first, distal actuation element 400 is firmly connected to the first, outer actuation shaft 300.
- the first actuating shaft 300 is held in place via the first actuating element 400 or rotated if necessary.
- the second, proximal actuation element 700 is connected to the second, inner actuation shaft 600 via the pin 704 and the locking ring 706. Via the second actuating element 700, the second actuating shaft 600 is rotated relative to the first actuating shaft 300 or, if necessary, held in place.
- a ratchet mechanism is implemented in the distal handwheel 402, with which one direction of rotation can be locked in the sense of a pawl mechanism.
- a pawl 404 acts on a pinion 406. In the desired direction of rotation, the pawl slides off the teeth of the pinion 406, but in the opposite direction the pawl gets jammed in the teeth and blocks the rotation.
- Such mechanics are well known in themselves.
- the pawl 404 is acted upon by the force of a compression spring 410 via a ball 408.
- the respective direction of rotation can be adjusted via a pawl lever 412 by pivoting the pawl 404 about the longitudinal axis L. Depending on the inclination of the pawl 404, it blocks the inner actuating shaft 600 from being turned back.
- FIGS. 2 and 3 shows a side sectional view at the top and a plan view at the bottom of the first, outer actuating shaft 300 of the device 200 from FIGS. 2 and 3.
- the outer actuation shaft 300 extends in the longitudinal direction L and has a proximal end 302 and a distal end 304.
- the central axis of the actuating shaft 300 coincides with the longitudinal axis L.
- the outer actuation shaft 300 is designed as a sleeve in which a second, inner actuation shaft 600 can rotate as a shaft.
- FIG. 5 shows a top view at the top and a side sectional view at the bottom of the second, inner actuating shaft 600 of the device 200 from FIGS. 2 and 3.
- the inner actuation shaft 600 extends in the longitudinal direction L and has a proximal end 602 and a distal end 604.
- the central axis of the actuating shaft 600 coincides with the longitudinal axis L.
- the inner actuation shaft 600 is designed here as a shaft, which can be inserted into the sleeve-like first actuation shaft 300 and rotate there.
- the distal end 604 of the inner actuating shaft 600 is designed like a hollow cylinder.
- a radially extending pin 608 is arranged, which is inserted into this hollow cylinder through two lateral bores and extends over the bottom of the hollow cylinder.
- FIG. 6 shows a top view at the top and a side sectional view at the bottom of the first, outer adapter piece 500 of the device 200 from FIGS. 2 and 3.
- the outer adapter piece 500 extends in the longitudinal direction L and has a proximal end 502 and a distal end 504.
- the central axis of the adapter piece 500 coincides with the longitudinal axis L.
- the outer adapter piece 500 is designed as a sleeve in which a second, inner adapter piece 800 can rotate as a shaft.
- a widening 514 of the wall thickness At the proximal end 502 of the outer adapter piece 500 there is, on the one hand, a widening 514 of the wall thickness.
- the widening 514 serves on the one hand as a stop for the widening at the proximal end 802 of the inner adapter piece 800, and on the other hand as a stop for the distal end 604 of the inner actuating shaft 600.
- the feather key 508 inserted in the widening 514 serves to engage in the engagement area 306 (groove 308) of the first actuating shaft 300.
- the external thread 510 can be seen, which is used to screw on the threaded sleeve 512.
- the engagement area 506 for the actuation of the intramedullary nail 1 can be seen here, in which axially extending cylinder segment-like teeth 518 inserted in the external thread 510 are present.
- FIG. 7 shows a side view of the second, inner adapter piece 800 of the device 200 from FIGS. 2 and 3.
- the inner adapter piece 800 extends in the longitudinal direction L and has a proximal end 802 and a distal end 804.
- the central axis of the adapter piece 800 coincides with the longitudinal axis L.
- the inner adapter piece 800 is designed as a shaft and can rotate in the first, outer adapter piece 500.
- the inner adapter piece 800 has a widening 810 at the proximal end 802.
- the widening 810 serves as a stop relative to the proximal end 502 of the outer adapter piece 500.
- the radially extending groove 808 is also formed, which serves to engage in the engagement region 606, namely the pin 608, of the inner actuating shaft 600.
- Fig. 8 shows a perspective view of the device 200 from Fig. 2 and Fig. 3, seen from the distal end 204. Seen from the outside are (starting from the proximal end 202 to the distal end 204): proximal actuating element 700, inner actuating shaft 600, distal actuating element 400, outer actuating shaft 300, external thread 310, union nut 312, threaded sleeve 512, external engagement area 506 with teeth 518, internal engagement area 806 with teeth 812.
- Fig. 9a shows a perspective detailed view, which illustrates the approach and coupling of the distal end 204 of the device 200 according to the invention from Figs. 2, 3 and 8 to the proximal end 12 of a suitable intramedullary nail 1 according to Fig. 1, and Fig. 9b shows a corresponding display after coupling.
- the outer engagement region 506 of the outer adapter piece 500 is brought to the outer engagement region 32 of the intramedullary nail 1, and the inner engagement region 806 of the inner adapter piece 800 is brought to the inner engagement region 1032 of the intramedullary nail 1.
- the inner teeth 812 engage in the inner engagement area 1032.
- the outer teeth 518 are formed as segment-like recesses or teeth 518 in the external thread 510, and the outer engagement region 32 of the intramedullary nail 1 is formed exactly complementary to this.
- the teeth 518 can thus interlock with the outer sleeve 26 of the intramedullary nail 1, and at the same time a continuous external thread 510 is formed, onto which the threaded sleeve 512 can then be screwed.
- the intramedullary nail 1 is then axially fixed and can be actuated and handled by the device 200.
- FIG 10 shows a perspective, side view of a set according to the invention for providing the device 200 according to the invention from FIGS. 2, 3 and 8.
- the set contains at least one device 200 with the distal Actuating element 400, the proximal actuating element 700, the outer actuating shaft 300, the inner actuating shaft 600, and at least one adapter piece 500, 800, preferably with both adapter pieces, the outer adapter piece 500 and the inner adapter piece 800, particularly preferably additionally with the union nut 312 and the threaded sleeve 512.
- This representation of the individual parts also shows particularly clearly how the distal end 804 of the second, inner adapter piece 800 can be passed through the proximal end 502 of the first, outer adapter piece 500 during assembly.
- FIG. 11 shows a schematic, side view of a device 200 according to the invention with a set of adapter sets according to the invention for actuating intramedullary nails 1, each with a different intramedullary nail diameter, with the otherwise same device 200.
- An adapter set consists of at least the first, outer adapter piece 500 and the inner adapter piece 800, which are each adapted to the diameter of the intramedullary nail 1 to be connected.
- An adapter set can preferably also contain adapted threaded sleeves 512 and union nuts 312.
- Adapter sets for connection to intramedullary nails 1 with a diameter of 8, 9, 10, 11 or 12 mm are shown schematically here. It becomes clear that with the device according to the invention 200 intramedullary nails 1 with a wide variety of diameters can be actuated, the effort for procuring suitable adapter sets being practically negligible compared to procuring different devices 200.
- Embodiment 1 Device for actuating an intramedullary nail, the intramedullary nail being suitable for internal stabilization and/or fixation of an elongated hollow body, in particular a bone, extending in an axial longitudinal direction and having a proximal end and a distal end, and having an elongated spring element , which is wound in a helical shape starting from the proximal end and based on the longitudinal direction, the radial expansion of the wound spring element being able to be reduced by tensioning the spring element in the winding direction and increased by relaxing the spring element against the winding direction, the proximal end of the intramedullary nail has a nail head in which a proximal end of the spring element is anchored in an anchor element, the anchor element having an engagement region for a device for actuating an intramedullary nail, and wherein the spring element can be braced by engaging and rotating the anchor element with such a device and is relaxable, wherein the device for actuating an intramed
- Embodiment 2 Device according to the previous embodiment, wherein an adapter piece is arranged between the distal end of the actuation shaft and the distal end of the device, which is non-rotatably connected to the engagement area of the actuation shaft at the distal end of the actuation shaft is, and which has an engagement area at the distal end of the device, which is complementary to an engagement area of the anchor element of an intramedullary nail that can be arranged opposite.
- Embodiment 3 Device according to one or both of the two previous embodiments, wherein the actuating shaft extends in the longitudinal direction and has a proximal end and a distal end.
- Embodiment 4 Device according to one or more of the preceding embodiments, wherein a central axis of the actuating shaft coincides with the longitudinal axis.
- Embodiment 5 Device according to one or more of the preceding embodiments, wherein the distal end of the adapter piece coincides with the distal end of the device.
- Embodiment 6 Device according to one or more of the preceding embodiments, wherein the device has two actuating shafts for indirectly actuating two spring elements of an intramedullary nail that can be arranged opposite one another.
- Embodiment 7 Device according to one or more of the preceding embodiments, wherein an adapter piece is arranged between the distal end of each actuating shaft and the distal end of the device.
- Embodiment 8 Device according to one or more of the preceding embodiments, wherein two actuating shafts are arranged concentrically.
- Embodiment 9 Device according to one or more of the preceding embodiments, wherein a first, outer actuating shaft is designed as a sleeve and a second, inner actuating shaft is designed as a shaft rotatably mounted therein.
- Embodiment 10 Device according to one or more of the preceding embodiments, wherein the adapter piece extends in the longitudinal direction and has a proximal end and a distal end.
- Embodiment 11 Device according to one or more of the preceding embodiments, wherein a central axis of the adapter piece coincides with the longitudinal axis.
- Embodiment 12 Device according to one or more of the preceding embodiments, wherein two adapter pieces are provided, in particular wherein the two adapter pieces are arranged concentrically.
- Embodiment 13 Device according to one or more of the preceding embodiments, wherein a first, outer adapter piece is designed as a sleeve and a second, inner adapter piece is designed as a shaft rotatably mounted therein.
- Embodiment 14 Device according to one or more of the preceding embodiments, wherein the distal end of a second adapter piece is passed through the proximal end of a first adapter piece.
- Embodiment 15 Device according to one or more of the preceding embodiments, wherein a first, outer adapter piece is designed with a widened, hollow cylinder-like proximal end.
- Embodiment 16 Device according to one or more of the preceding embodiments, wherein a second, inner adapter piece is designed with a widened, cylinder-like proximal end, with a widening of a first adapter piece serving as a stop for a widening of the second adapter piece.
- Embodiment 17 Device according to one or more of the preceding embodiments, wherein the distal end of an actuating shaft has a radially extending pin, and the proximal end of an adapter piece has a radially extending groove which engages in a rotationally fixed manner in the pin.
- Embodiment 18 Device according to the previous embodiment, wherein the distal end of the actuating shaft is designed like a hollow cylinder, and the pin is arranged at the bottom of the hollow cylinder.
- Embodiment 19 Device according to one or more of the preceding embodiments, wherein the proximal end of an adapter piece has a radially extending pin, and the distal end of an actuating shaft has a radially extending groove which engages in a rotationally fixed manner in the pin.
- Embodiment 20 Device according to one or more of the preceding embodiments, wherein the distal end of an actuating shaft has an axially extending groove, and the proximal end of an adapter piece has an axially extending feather key which engages in the groove in a rotationally fixed manner.
- Embodiment 21 Device according to one or more of the preceding embodiments, wherein the proximal end of an adapter piece has an axially extending groove, and the distal end of an actuating shaft has an axially extending key which engages in the groove in a rotationally fixed manner.
- Embodiment 22 Device according to one or more of the preceding embodiments, wherein an adapter piece has an external thread at the distal end.
- Embodiment 23 Device according to one or more of the preceding embodiments, wherein a threaded sleeve is arranged on the external thread of an adapter piece, which can be screwed onto the nail head of an intramedullary nail that can be arranged opposite.
- Embodiment 24 Device according to one or more of the preceding embodiments, wherein the distal end of an actuation shaft, in particular an external actuation shaft, has an external thread.
- Embodiment 25 Device according to one or more of the preceding embodiments, wherein an adapter piece is fixed in or on the actuation shaft by a union nut screwed onto the distal end of the actuation shaft, in particular by the union nut defining a suitable widening or a shoulder of the adapter piece in the distal direction .
- Embodiment 26 Device according to one or more of the preceding embodiments, wherein an actuating element is designed as a handwheel.
- Embodiment 27 Device according to one or more of the preceding embodiments, wherein the center of an actuating element, in particular a handwheel, coincides with the longitudinal axis.
- Embodiment 28 Device according to one or more of the preceding embodiments, wherein two axially spaced actuating elements are provided, a distal actuating element being assigned to an outer actuating shaft, and a proximal actuating element being assigned to an inner, in particular coaxial, actuating shaft.
- Embodiment 29 Device according to the previous embodiment, wherein the proximal actuation element with the inner actuation shaft is rotatable relative to the distal actuation element with the outer actuation shaft.
- Embodiment 30 Device according to the previous embodiment, with a lock (ratchet function) being adjustable for each desired direction of rotation.
- Embodiment 31 Device according to the previous embodiment, wherein a ratchet mechanism is arranged in the distal actuation element.
- Embodiment 32 Device according to one or more of the preceding embodiments, wherein the engagement region at the distal end of an adapter piece has: axially extending recesses, projections, teeth, prongs, serrations, or several thereof.
- Embodiment 33 Device according to one or more of the preceding embodiments, wherein the engagement region at the distal end of an adapter piece is formed within an external thread or integrally with an external thread of the adapter piece.
- Embodiment 34 Device according to one or more of the preceding embodiments, wherein a threaded sleeve of an adapter piece and / or a union nut of an actuating shaft is or are coated, in particular with a titanium nitride coating.
- Embodiment 35 Device according to one or more of the preceding embodiments, wherein an adapter piece and an associated actuating shaft are made of different material.
- Embodiment 36 Device according to one or more of the preceding embodiments, wherein an adapter piece is hardened.
- Embodiment 37 Adapter piece which can be arranged between the distal end of the actuation shaft and the distal end of a device according to one or more of the preceding embodiments, and which can be connected in a rotationally fixed manner to the engagement area of the actuation shaft at the distal end of the actuation shaft of the device, and which on its distal end has an engagement area which is complementary to an engagement area of the anchor element of an intramedullary nail that can be arranged opposite.
- Embodiment 38 Set consisting of a device according to embodiment 1 and an adapter piece according to embodiment 37, for providing a device according to one or more of the previous embodiments 2 to 36.
- Embodiment 39 Set of a first outer adapter piece and a second inner adapter piece, each possibly according to embodiment 37, for a device according to one or more of the preceding embodiments 2 to 36.
- Embodiment 40 Set according to the previous embodiment, wherein the set additionally has a threaded sleeve for the distal end of the first adapter piece and a union nut for the proximal end of the first adapter piece.
- Embodiment 41 Set according to one of the two previous embodiments, wherein at least two sets of a first outer adapter piece and a second inner adapter piece are included, namely each with a different extent of the distal ends, for connection to intramedullary nails with different diameters.
- Embodiment 42 Set according to one or more of the three previous embodiments, each containing adapter pieces for connection to intramedullary nails with a diameter of 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, or several thereof , or all of these.
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Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE202022104342.6U DE202022104342U1 (de) | 2022-07-30 | 2022-07-30 | Vorrichtung zum Betätigen eines Marknagels, umfassend ein Adapterstück, Set zur Bereitstellung einer solchen Vorrichtung, Adapterstück, sowie Adapterset |
| PCT/DE2023/100560 WO2024027879A1 (de) | 2022-07-30 | 2023-07-28 | Vorrichtung zum betätigen eines marknagels, umfassend ein adapterstück, set zur bereitstellung einer solchen vorrichtung, adapterstück, sowie adapterset |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4561473A1 true EP4561473A1 (de) | 2025-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23764562.7A Pending EP4561473A1 (de) | 2022-07-30 | 2023-07-28 | Vorrichtung zum betätigen eines marknagels, umfassend ein adapterstück, set zur bereitstellung einer solchen vorrichtung, adapterstück, sowie adapterset |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20250352254A1 (de) |
| EP (1) | EP4561473A1 (de) |
| DE (2) | DE202022104342U1 (de) |
| MX (1) | MX2025001240A (de) |
| WO (1) | WO2024027879A1 (de) |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5108398A (en) * | 1990-10-16 | 1992-04-28 | Orthopaedic Research Institute | Orthopaedic knee fusion apparatus |
| DE102004063396B4 (de) | 2004-12-23 | 2006-11-02 | Michael Zielsdorf | Marknagel |
| DE202007008234U1 (de) | 2007-06-12 | 2007-08-30 | Englert, Thomas | Montierinstrument |
| US8414584B2 (en) * | 2008-07-09 | 2013-04-09 | Icon Orthopaedic Concepts, Llc | Ankle arthrodesis nail and outrigger assembly |
| US10251757B2 (en) * | 2008-09-17 | 2019-04-09 | Skeletal Dynamics Llc | Grooved slot allowing adjustment of the position of a bone fixation device for osteosynthesis |
| US20110160728A1 (en) * | 2009-12-31 | 2011-06-30 | Amei Technologies, Inc. | Intramedullary Compression Nail and Related Method for Jones Fractures |
| EP2722016A1 (de) | 2012-10-19 | 2014-04-23 | Rapido Med GmbH | Aufsatz für das proximale Ende eines Marknagels |
| EP2722015A1 (de) | 2012-10-19 | 2014-04-23 | Rapido Med GmbH | Intramedullärer Marknagel |
| DE102014101411A1 (de) * | 2014-02-05 | 2015-08-06 | CREADO medtec GmbH | Anordnung für die Innenstabilisierung und/oder -fixierung eines langgestreckten Hohlkörpers sowie Vorrichtung zum Betätigen dieser |
| DE102018005690A1 (de) | 2018-02-13 | 2019-08-14 | OMEGA salvation UG (haftungsbeschränkt) | Flexibler Doppelhelix Marknagel |
| DE202020003051U1 (de) | 2020-07-16 | 2020-08-12 | OMEGA salvation UG (haftungsbeschränkt) | Anordnung zur Frakturversorgung von Knochen |
| DE202021106260U1 (de) | 2021-11-16 | 2023-02-27 | Jabez Medical GmbH & Co. KG | Zweiteiliger Marknagel sowie Nagelkern hierfür |
-
2022
- 2022-07-30 DE DE202022104342.6U patent/DE202022104342U1/de active Active
-
2023
- 2023-07-28 WO PCT/DE2023/100560 patent/WO2024027879A1/de not_active Ceased
- 2023-07-28 EP EP23764562.7A patent/EP4561473A1/de active Pending
- 2023-07-28 DE DE112023003294.7T patent/DE112023003294A5/de active Pending
- 2023-07-28 US US19/099,428 patent/US20250352254A1/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| US20250352254A1 (en) | 2025-11-20 |
| DE202022104342U1 (de) | 2023-11-07 |
| MX2025001240A (es) | 2025-07-01 |
| DE112023003294A5 (de) | 2025-08-28 |
| WO2024027879A1 (de) | 2024-02-08 |
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