CN111772764A - Intramedullary nail distal hole positioning device and intramedullary nail distal hole positioning method - Google Patents

Intramedullary nail distal hole positioning device and intramedullary nail distal hole positioning method Download PDF

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Publication number
CN111772764A
CN111772764A CN202010797887.7A CN202010797887A CN111772764A CN 111772764 A CN111772764 A CN 111772764A CN 202010797887 A CN202010797887 A CN 202010797887A CN 111772764 A CN111772764 A CN 111772764A
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CN
China
Prior art keywords
intramedullary nail
electric field
cable
distal hole
aiming
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Pending
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CN202010797887.7A
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Chinese (zh)
Inventor
樊国平
王丽
刘梁
高国强
赵宇
曹春红
孙杨
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Beijing Fule Science & Technology Development Co ltd
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Beijing Fule Science & Technology Development Co ltd
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Priority to CN202010797887.7A priority Critical patent/CN111772764A/en
Publication of CN111772764A publication Critical patent/CN111772764A/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/72—Intramedullary pins, nails or other devices
    • A61B17/7233—Intramedullary pins, nails or other devices with special means of locking the nail to the bone
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/90—Guides therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B2017/564—Methods for bone or joint treatment

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Medical Informatics (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (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)
  • Neurology (AREA)
  • Surgical Instruments (AREA)

Abstract

The invention discloses an intramedullary nail distal hole positioning device and an intramedullary nail distal hole positioning method, wherein the intramedullary nail distal hole positioning device comprises an aiming support, a cable, an aiming device and an electric field inductor which are suitable for being connected with the proximal end of an intramedullary nail; the cable extends from the proximal end of the intramedullary nail into the intramedullary nail and to or beyond the distal hole of the intramedullary nail; an aiming device adjustably mounted on the aiming support for aiming the distal hole of the intramedullary nail; the electric field inductor is detachably installed in the sighting device and used for inducing the electric field of the cable. The intramedullary nail distal hole positioning device is convenient for positioning the distal hole of the intramedullary nail, shortens the intramedullary nail fixing time and improves the intramedullary nail fixing success rate.

Description

Intramedullary nail distal hole positioning device and intramedullary nail distal hole positioning method
Technical Field
The invention belongs to the technical field of medical instruments, and particularly relates to an intramedullary nail distal hole positioning device and an intramedullary nail distal hole positioning method.
Background
When treating fracture, the intramedullary nail fixing technology is widely applied clinically, the installation of the distal locking nail of the intramedullary nail is a key link of the intramedullary nail fixing technology, and the accuracy of the positioning of the distal nail hole position of the intramedullary nail directly influences the operation quality.
In the related art, there are three main ways to determine the position of the distal nail hole of the intramedullary nail: firstly, the hole site is searched by means of X-ray imaging equipment in the operation, but the mode has high requirements on the operation experience of doctors, and X rays can generate a large amount of radiation to cause injury to medical staff and patients; secondly, a limiting and aiming technology of the positioning rod is adopted, but a drill hole needs to be added on the bone tissue in the mode, so that the operation steps are more, and extra trauma is also added to a patient; thirdly, a magnetic aiming and positioning technology is adopted, but in the operation drilling process, the drill bit slides and deviates due to the fact that the cutting edge of the drill bit is not sharp or the drilling speed is high, and the drilling direction is deviated.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the embodiment of one aspect of the invention provides an intramedullary nail distal hole positioning device which is convenient for positioning the distal hole of the intramedullary nail, shortens the intramedullary nail fixing time and improves the intramedullary nail fixing success rate.
The embodiment of the invention also provides a method for positioning the distal hole of the intramedullary nail.
The intramedullary nail distal hole positioning device comprises: an aiming bracket adapted to be coupled to a proximal end of an intramedullary nail, a cable extending from the proximal end of the intramedullary nail into the intramedullary nail and to or beyond a distal bore of the intramedullary nail, an aimer adjustably mounted on the aiming bracket for aiming at the distal bore of the intramedullary nail, and an electric field sensor removably mounted within the aimer for sensing an electric field of the cable.
According to the intramedullary nail distal hole positioning device provided by the embodiment of the invention, the electric field generated by the cable is induced through the electric field inductor, the electric field area generated by the cable is induced by adjusting the position of the sighting device, the alignment of the sighting device and the intramedullary nail distal hole is realized by calculating the middle point of the electric field area and adjusting the sighting device to the middle point, the X-ray is not needed, the operation steps are simple, the intramedullary nail distal hole positioning is convenient, the intramedullary nail fixing time can be shortened, and the intramedullary nail fixing success rate is improved.
In some embodiments, the aiming bracket is coupled to the proximal end of the intramedullary nail by a threaded interface.
In some embodiments, the intramedullary nail distal hole locating device further comprises an aiming adjuster mounted on the aiming bracket and for adjusting the aiming adjuster.
In some embodiments, an aiming scale is provided on the aiming support for indicating the position of the sight.
In some embodiments, the electric field sensor includes a housing, an induction coil for inducing an electric field generated by the cable, and a power supply and acquisition circuit disposed within the housing, the induction coil and power supply being coupled to the acquisition circuit.
In some embodiments, the electric field sensor further comprises an indicator for indicating an electric field generated by the induction coil sensing the cable.
In some embodiments, the sheath of the cable has a length scale value thereon for reading the extension of the cable into the intramedullary nail.
In some embodiments, the aiming support comprises a support frame and a swing rod, the support frame is suitable for being connected with the proximal end of the intramedullary nail, the swing rod is swingably supported by the support frame, the aiming device is installed at one end of the swing rod, the other end of the swing rod is hinged with the support frame, and a pressing hand wheel is installed on a pivot between the other end of the swing rod and the support frame.
An embodiment according to another aspect of the present invention further provides an intramedullary nail distal hole positioning method, including:
extending a cable from a proximal end of an intramedullary nail into the intramedullary nail and extending the cable to or beyond a distal bore of the intramedullary nail;
powering a cable to cause the cable to generate an electric field within the intramedullary nail;
detecting an electric field generated by the cable by using an electric field inductor installed in the sighting device;
adjusting the position of the sighting device, and recording the area of the electric field sensed by the electric field sensor;
a midpoint of the region is calculated and the aimer is adjusted to the midpoint to align the aimer with a distal hole of the intramedullary nail.
According to the intramedullary nail distal hole positioning method provided by the embodiment of the invention, the electric field of the cable is induced through the electric field inductor, the electric field area of the cable is induced by adjusting the position of the sighting device, the alignment of the sighting device and the distal hole of the intramedullary nail is realized by calculating the middle point of the electric field area and adjusting the sighting device to the middle point, the X-ray is not needed, the operation steps are simple, the intramedullary nail distal hole positioning is convenient, the intramedullary nail fixing time can be shortened, and the intramedullary nail fixing success rate is improved.
In some embodiments, the computing a midpoint of a region comprises: swinging the sight to a first position K1And recording said first position K1Angle value of X1The first position is a first limit position capable of sensing an electric field generated by the cable;
swing the sighting device to the second position K2And recording said first limit position K2Angle value of X2The second position is a second limit position capable of sensing an electric field generated by the cable;
swing the aiming support to the middle point position K3The angle value of the midpoint position is X3Wherein X is3＝(X1+X2)/2。
Drawings
Fig. 1 is a schematic structural view of a distal hole positioning device for an intramedullary nail according to an embodiment of the present invention.
Fig. 2 is a schematic diagram illustrating the use of the intramedullary nail distal hole location method in accordance with an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of the middle electric field inductor 5 of the intramedullary nail distal hole positioning device according to the embodiment of the invention.
Fig. 4 is a schematic circuit distribution diagram of the acquisition circuit in the middle electric field inductor of the intramedullary nail distal hole positioning device according to the embodiment of the invention.
Reference numerals:
the device comprises a support frame 1, a swing rod 2, a cable 3, an aiming device 4, an electric field inductor 5, a shell 501, a power supply 502, an acquisition circuit 503, a field effect tube 5031, a resistor 5032, a triode 5033, a diode 5034, an induction coil 504, an indicator 505, a threaded interface 6, an aiming adjuster 7, a pressing hand wheel 8, an aiming scale 9, a fixing screw 10, an intramedullary nail 11, a distal hole 1101 and a support leg 12.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An intramedullary nail distal hole locating device according to an embodiment of the present invention is described below with reference to the accompanying drawings.
As shown in fig. 1, the intramedullary nail distal hole positioning device according to the embodiment of the invention comprises an aiming bracket, a cable 3, an aiming device 4 and an electric field inductor 5. The aiming bracket is adapted to be connected to a proximal end of the intramedullary nail 11, and the cable 3 extends from the proximal end of the intramedullary nail 11 into the interior of the intramedullary nail 11 and to or beyond the distal hole 1101 of the intramedullary nail 11. As shown in fig. 1, the head of the cable 3 (the left end of the cable 3 in fig. 1) is located at or beyond the distal hole 1101 of the intramedullary nail 11. The sighting device 4 is adjustably mounted on the swing rod 2, as shown in fig. 1 and 2, the sighting device 4 is fixedly mounted on the swing rod 2 and vertically arranged in the up-down direction, the sighting device 4 is used for aiming at a distal hole 1101 of the intramedullary nail 11, and the electric field sensor 5 is detachably mounted in the sighting device 4 and used for sensing the electric field generated by the cable 3.
According to the intramedullary nail distal hole positioning device provided by the embodiment of the invention, the electric field generated by the cable 3 is induced by the electric field inductor 5, the electric field area generated by the cable 3 is induced by adjusting the position of the sighting device 4, the middle point of the electric field area is calculated, and the sighting device is adjusted to the middle point, so that the sighting device 4 is aligned with the distal hole 1101 of the intramedullary nail 11, the X-ray is not needed, the operation steps are simple, the intramedullary nail distal hole positioning is convenient, the intramedullary nail fixing time can be shortened, and the intramedullary nail fixing success rate is improved.
In some embodiments, the aiming stand comprises a support frame 1 and a swing rod 2, the support frame 1 is suitable for being connected with the proximal end of an intramedullary nail 11, the swing rod 2 is swingably supported by the support frame 1, preferably, a support leg 12 for stabilizing the swing rod 2 is arranged on the swing rod, an aiming device 4 is arranged at one end of the swing rod 2, as shown in fig. 1, the aiming device 4 is arranged at the left end of the swing rod 2, the other end of the swing rod 2 is hinged with the support frame 1, the right end of the swing rod 2 is hinged with the support frame 1, a pressing hand wheel 8 is arranged on a pivot between the other end of the swing rod 2 and the support frame 1, namely, the pressing hand wheel 8 is arranged on a pivot between the right end of the swing rod 2 and the support frame 1, as shown in fig. 1 and 2, the pressing hand wheel 8 is loosened, the swing rod 2 can swing horizontally, the position of the sight 4 is then also fixed.
In some embodiments, the aiming bracket is coupled to the proximal end of the intramedullary nail 11 via the threaded interface 6, but the manner in which the aiming bracket is coupled to the proximal end of the intramedullary nail 11 is not so limited.
In some embodiments, the intramedullary nail distal hole positioning device further comprises an aiming adjuster 7 mounted on the aiming bracket and used for adjusting the aiming device 4, as shown in fig. 1, the aiming adjuster 7 is arranged at the hinge joint of the swing rod 2 and the supporting frame 1, and the aiming device 4 can horizontally swing around the aiming adjuster 7.
In some embodiments, the aiming scale 9 is provided on the aiming stand for indicating the position of the sight 4, and the aiming scale 9 can read the value of the angle through which the sight 4 swings. .
In some embodiments, the electric field sensor 5 includes a housing 501, an induction coil 504 for sensing an electric field generated by the cable 3, and a power source 502 and a collection circuit 503 provided in the housing 501, the induction coil 504 and the power source 502 are connected to the collection circuit 503, the power source 502 supplies power to the collection circuit 503, as shown in fig. 3, the induction coil 504 is provided at a right end portion of the housing 501, and the induction coil 504 is disposed toward the cable 3 when the electric field sensor 5 is placed in the sight 4.
In some embodiments, the electric field inductor 5 further comprises an indicator 505 for indicating that the induction coil 504 induces the electric field generated by the cable 3. The induction coil 504 induces an electric field to cause the indicator 505 to respond, such as a buzzer sounding or a light lighting, but the type of the indicator 505 is not limited thereto.
In some embodiments, the sheath of the cable 3 has a scale of its length for reading the extension of the cable 3 into the intramedullary nail 11, by reading which it is known whether the location where the cable 3 extends from the proximal end of the intramedullary nail 11 into the intramedullary nail 11 extends to or beyond the distal hole 1101 of the intramedullary nail 11.
As shown in fig. 4, in some embodiments, the acquisition circuit 503 includes a field-effect transistor 5031, a resistor 5032, a transistor 5033, and a diode 5034, three pins of the field-effect transistor 5031 are respectively connected to the inductor 504, the resistor 5032, and the transistor 5033, the resistor 5032 is connected in series with the indicator 505 and then connected to the transistor 5033, one end of the diode 5034 is connected to the transistor 5033, and the other end of the diode 5034 is connected between the resistor 5032 and the field-effect transistor 5031, in other words, the diode 5034 is connected in parallel between the resistor 5032 and the indicator 505, when the acquisition circuit 503 is in a normal state, the field-effect transistor 5031 forms a leakage current due to the gate suspension, no current flows into the base of the transistor 5033, and. When the induction coil 504 induces the electric field of the cable, the induction coil 504 induces an alternating voltage to be applied to the gate of the fet 5031, the fet 5031 is turned off, the voltage of the power supply 502 is applied to the base of the transistor 5033 through the resistor 5032 and the diode 5033, the transistor 5033 is turned on, and the indicator 505 is in an operating state, i.e., the LED is on or the buzzer sounds. On the basis of the circuit, signal amplification and signal processing can be added, so that the electric field inductor 5 is more sensitive and accurate.
In some embodiments, the sheath of the cable 3 is an insulating layer, the cable 3 is connected to the live wire end of a power source, the power source is an ac power source, and optionally, the ac power source can use a safe voltage of 36V or less, and preferably, the voltage of the ac power source is 12V.
Referring to fig. 1-3, an intramedullary nail distal hole positioning device in accordance with some specific examples of the present invention is described.
The intramedullary nail distal hole locating device according to the specific example of the present invention comprises an aiming bracket, a cable 3, an aiming device 4 and an electric field inductor 5.
The aiming support comprises a support frame 1 and a swing rod 2, the right end of the support frame 1 is connected with the proximal end of an intramedullary nail 11 through a threaded interface 6, the left end of the support frame 1 is hinged with the right end of the swing rod 2, a cable 3 extends into the inside of the intramedullary nail 11 from the proximal end of the intramedullary nail 11 and extends to or exceeds a distal hole 1101 of the intramedullary nail 11, as shown in fig. 1, the head of the cable 3 is positioned at the distal hole 1101 of the intramedullary nail 11 or exceeds the position of the distal hole 1101, the head of the cable 3 is the left end of the cable 3, an aiming device 4 is adjustably installed on the swing rod 2, as shown in fig. 1 and 2, the aiming device 4 is fixedly installed on the swing rod 2 and vertically arranged along the up-down direction, the aiming device 4 is used for aiming at the distal hole 1101 of the intramedullary nail.
A pressing hand wheel 8 is arranged on a pivot between the right end of the swing rod 2 and the support frame 1, the pressing hand wheel 8 is loosened, the swing rod can horizontally swing around the pivot, the pressing hand wheel 8 is screwed, the position between the swing rod 2 and the support frame 1 is relatively fixed, namely the position of the swing rod 2 is locked by the pressing hand wheel 8, and the position of the sighting device 4 is fixed immediately.
Methods of using intramedullary nail distal hole location devices of some specific examples of the present invention are described below with reference to fig. 1-3.
Extending the cable 3 from a proximal end of the intramedullary nail 11 into the intramedullary nail 11 and to or beyond a distal hole 1101 of the intramedullary nail 11, supplying power to the cable 3 to cause the cable 3 to generate an electric field within the intramedullary nail 11, mounting an electric field sensor 5 within the aimer 4, detecting the electric field generated by the cable 3 with the electric field sensor 5, adjusting the position of the aimer 4, and recording an area where the electric field sensor 5 senses the electric field, calculating a midpoint of the electric field area, and adjusting the aimer 4 to the midpoint of the electric field area to cause the aimer 4 to be aligned with the distal hole 1101 of the intramedullary nail 11.
The embodiment of the invention also provides an intramedullary nail distal hole positioning method, which comprises the following steps:
the cable 3 is extended from the proximal end of the intramedullary nail 11 into the intramedullary nail 11 and extends the cable 3 to or beyond the distal hole 1101 of the intramedullary nail 11.
The cable 3 is powered such that the cable 3 generates an electric field within the intramedullary nail 11.
The electric field generated by the cable 3 is detected by means of an electric field sensor 5 mounted in the sight 4.
The position of the sight 4 is adjusted and the area where the electric field is sensed by the electric field sensor 5 is recorded.
The midpoint of the region is calculated and the sight 4 is adjusted to the midpoint to align the sight 4 with the distal hole 1101 of the intramedullary nail 11.
According to the intramedullary nail distal hole positioning method provided by the embodiment of the invention, the electric field generated by the cable 3 is induced by the electric field inductor 5, the electric field area of the cable 3 is induced by adjusting the position of the sighting device 4, the alignment of the sighting device 4 and the distal hole 1101 of the intramedullary nail 11 is realized by calculating the middle point of the electric field area and adjusting the sighting device 4 to the middle point, the X-ray is not needed, the operation steps are simple, the intramedullary nail distal hole positioning is convenient, the intramedullary nail fixing time can be shortened, and the intramedullary nail fixing success rate is improved.
In some embodiments, calculating the midpoint of the electric field region comprises swinging the sight 4 to a first position K1And recording the first position K1Angle value of X1The first position is a first extreme position capable of sensing the electric field generated by the cable 3, and the sighting device 4 is swung to a second position K2And recording the first limit position K2Angle value of X2The second extreme position is capable of sensing the electric field generated by the cable 3, and the aiming support is swung to the middle point position K3Angle of the midpoint positionValue X3Wherein X is3＝(X1+X2)/2。
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. An intramedullary nail distal hole positioning device, comprising:
an aiming bracket adapted to connect with a proximal end of an intramedullary nail;
a cable extending from a proximal end of the intramedullary nail into the intramedullary nail and to or beyond a distal hole of the intramedullary nail;
an aiming arm adjustably mounted on the aiming bracket for aiming at a distal hole of the intramedullary nail;
an electric field sensor removably mounted within the sight for sensing an electric field of the cable.
2. The intramedullary nail distal hole positioning device of claim 1, wherein the aiming bracket is connected to the proximal end of the intramedullary nail by a threaded interface.
3. The intramedullary nail distal hole positioning device of claim 1, further comprising an aiming adjuster mounted on the aiming bracket for adjusting the aiming arm.
4. The intramedullary nail distal hole positioning device of claim 3, wherein the aiming bracket is provided with an aiming scale for indicating the position of the aimer.
5. The intramedullary nail distal hole locating device according to any one of claims 1 to 4, wherein the electric field sensor comprises a housing, an induction coil for inducing an electric field generated by the cable, and a power supply and acquisition circuit disposed within the housing, the induction coil and power supply being connected to the acquisition circuit.
6. The intramedullary nail distal hole locating device of claim 5, wherein the electric field sensor further comprises an indicator for indicating an electric field induced by the induction coil to the cable.
7. The intramedullary nail distal hole locating device of claim 1, wherein the sheath of the cable has a length scale value thereon for reading the extension of the cable into the intramedullary nail.
8. The intramedullary nail distal hole positioning device according to claim 1, wherein the aiming support comprises a support frame and a swing rod, the support frame is suitable for being connected with the proximal end of the intramedullary nail, the swing rod is swingably supported by the support frame, the aiming device is installed at one end of the swing rod, the other end of the swing rod is hinged with the support frame, and a pressing hand wheel is installed on a pivot between the other end of the swing rod and the support frame.
9. A method of locating a distal hole of an intramedullary nail, comprising:
extending a cable from a proximal end of an intramedullary nail into the intramedullary nail and extending the cable to or beyond a distal bore of the intramedullary nail;
powering a cable to cause the cable to generate an electric field within the intramedullary nail;
detecting an electric field generated by the cable by using an electric field inductor installed in the sighting device;
adjusting the position of the sighting device, and recording the area of the electric field sensed by the electric field sensor;
a midpoint of the region is calculated and the aimer is adjusted to the midpoint to align the aimer with a distal hole of the intramedullary nail.
10. The intramedullary nail distal hole location method of claim 9, wherein calculating the midpoint of the region comprises:
swinging the sight to a first position K1And recording said first position K1Angle value of X1The first position is a first limit position capable of sensing an electric field generated by the cable;
swing the sighting device to the second position K2And recording said first limit position K2Angle value of X2The second position is a second limit position capable of sensing an electric field generated by the cable;
swing the aiming support to the middle point position K3The angle value of the midpoint position is X3Wherein X is3＝(X1+X2)/2。
CN202010797887.7A 2020-08-10 2020-08-10 Intramedullary nail distal hole positioning device and intramedullary nail distal hole positioning method Pending CN111772764A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010797887.7A CN111772764A (en) 2020-08-10 2020-08-10 Intramedullary nail distal hole positioning device and intramedullary nail distal hole positioning method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010797887.7A CN111772764A (en) 2020-08-10 2020-08-10 Intramedullary nail distal hole positioning device and intramedullary nail distal hole positioning method

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CN111772764A true CN111772764A (en) 2020-10-16

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