Intramedullary nail aiming device and bone treatment system including the same

Abstract

The present invention proposes an intramedullary nail aimer and a bone treatment system including the same, wherein the intramedullary nail aimer is suitable for a variety of intramedullary nails, and comprises: a handle, wherein the inner end of the handle is suitable for combining with any intramedullary nail selected from the plurality of intramedullary nails; a connecting device, which comprises a fixed portion and a rotating portion rotatably combined with the fixed portion, wherein the fixed portion is fixed to the outer end of the handle so that the rotation axis of the rotating portion is fixed relative to the handle and points to the starting position of the anterior arch bending of the intramedullary nail when the intramedullary nail is combined with the inner end; and an aiming arm, which has a distal aiming hole and is clamped to the rotating portion at a position corresponding to the intramedullary nail, so that the distal aiming hole is aligned with the distal screw hole of the intramedullary nail when the intramedullary nail is combined with the inner end.

Description

Technical Field

[0001] The invention relates to a medical instrument for orthopedic surgery, in particular to an intramedullary nail aiming device which is suitable for implanting a variety of intramedullary nails into the bone marrow cavity of a patient and aiming at the screw holes of the intramedullary nails, and a bone treatment system comprising the same. Background Art

[0002] Intramedullary nail fixation is one of the surgical techniques for treating large long bone fractures. This technique has the advantages of being relatively minimally invasive, with less bleeding, fewer complications, and early mobilization. However, due to the irregular shape of the medullary cavity, a single-shaped intramedullary nail will be forced to be squeezed and deformed after being implanted into the medullary cavity, especially at the starting position of the anterior arch bend, which will cause the position of the distal screw hole to change. In addition, since the position of the distal screw hole cannot be located, the implantation of the distal locking screw is very difficult, resulting in prolonged operation time, increased use of radiation, and even the risk of surgical failure.

[0003] The closest existing intramedullary nail aiming system technology is the intraoperative adjustment technology.

[0004] The intraoperative adjustment technology is to use X-ray imaging to continuously fine-tune the position of the guide sleeve during the operation so that the guide sleeve is aligned with the nail hole on the implant. There are two types of adjustment mechanisms, one is a sliding mechanism and the other is a rotating mechanism. The movement mode of the existing sliding mechanism is quite different from the actual deformation of the implant, and it is easy to produce a large axial deviation after the intramedullary nail is implanted. The position of the rotation center of the existing rotating mechanism will change due to the change in the length of the implant, so that even through rotation, the position of the aiming hole cannot be the same as the position of the distal screw hole of the intramedullary nail that is tilted after implantation, that is, a large axial deviation will also be generated. In addition, in order to complete the intramedullary nail implantation surgery, the proximal and distal screws of the intramedullary nail need to be implanted. To complete this process, the prior art needs to first connect the intramedullary nail to the handle, then connect the proximal aimer, remove the proximal aimer after the proximal screw is implanted, and reassemble the multiple components of the distal aimer. This series of cumbersome processes undoubtedly increases the difficulty of the operation, increases the risk of errors during the operation, prolongs the operation time, and places more stringent requirements on doctors.

[0005] Therefore, there is an urgent need in the art for an intramedullary nail aiming device system that can simply and conveniently complete an intramedullary nail implantation surgery and can accurately aim at the nail hole. Summary of the invention

[0006] In order to solve the above problems in the prior art, the present invention provides an intramedullary nail aiming device, which is suitable for a variety of intramedullary nails and includes:

[0007] a handle having an outer end and an inner end, wherein the inner end is adapted to be coupled to any intramedullary nail selected from the plurality of intramedullary nails;

[0008] A connecting device, comprising a fixing portion and a rotating portion rotatably coupled to the fixing portion, wherein the fixing portion is fixed to the outer end portion so as to position the rotation axis of the rotating portion to point to a front arch bending starting position of the intramedullary nail when the intramedullary nail is coupled to the inner end portion; and

[0009] An aiming arm, wherein the aiming arm is clamped to the rotating portion at a position corresponding to the intramedullary nail so that a plurality of distal aiming holes of the aiming arm are aligned with a plurality of distal screw holes of the intramedullary nail when the intramedullary nail is coupled to the inner end portion.

[0010] Optionally, the outer end of the handle is provided with a proximal aiming hole for aiming at the proximal screw hole of the intramedullary nail.

[0011] Optionally, the outer end of the handle is also provided with a guide needle hole for introducing a guide needle.

[0012] Optionally, the aiming arm further comprises a plurality of positioning structures corresponding to the plurality of intramedullary nails, and the aiming arm is clamped to the rotating portion at the positioning structures corresponding to the intramedullary nails.

[0013] Optionally, the rotating portion further comprises an interface for engaging with the positioning structure.

[0014] Optionally, the fixing portion further comprises a positioning pin with an opening at an end, wherein the positioning pin is inserted into a receiving hole in the outer end portion so as to fix the fixing portion to the outer end portion.

[0015] Optionally, the rotating portion is further provided with scale lines for indicating its rotation angle, and the fixed portion is provided with a window for exposing the scale lines so as to make them visible from the outside.

[0016] Optionally, the connecting device also includes a locking device rotatably coupled to the fixed portion, the locking device being configured to switch between a locking position and a release position by rotation, wherein in the locking position, the locking device squeezes the aiming arm, thereby locking the aiming arm and the rotating portion together relative to the fixed portion; in the release position, the locking device disengages from contact with the aiming arm, thereby allowing the aiming arm and the rotating portion to rotate relative to the fixed portion.

[0017] Optionally, the rotating portion further comprises a top ball resiliently biased to abut against the aiming arm.

[0018] Similarly, in order to solve the above problems in the prior art, the present invention also proposes a bone treatment system, which includes the intramedullary nail aiming device as described above and an intramedullary nail suitable for the intramedullary nail aiming device.

[0019] The present invention can be embodied as the exemplary embodiments in the accompanying drawings. However, it should be noted that the drawings are only exemplary, and any changes conceived under the teachings of the present invention should be considered to be included in the scope of the present invention, and the scope of the present invention is limited only by the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings illustrate exemplary embodiments of the present invention. These drawings should not be construed as necessarily limiting the scope of the present invention. The same numbers and / or similar reference numerals throughout may refer to the same and / or similar elements. In the various drawings:

[0021] Figure 1 is a schematic perspective view of an intramedullary nail aiming device and a bone treatment system in an assembled state according to the present invention;

[0022] Figure 2 is a schematic perspective view of an intramedullary nail aiming device and a bone treatment system in a disassembled state according to the present invention;

[0023] Figure 3 is a schematic perspective view of a connecting device of an intramedullary nail aiming device according to the present invention in an assembled state;

[0024] Figure 4 is a schematic perspective view of a connecting device of an intramedullary nail aiming device according to the present invention in an exploded state;

[0025] Figure 5 is a schematic perspective view of a connecting device of an intramedullary nail aiming device according to the present invention in an assembled state; and

[0026] Figure 6 Schematic diagram of the tilting of an intramedullary nail after implantation and the operation of a prior art aiming mechanism. DETAILED DESCRIPTION

[0027] The present invention will now be described in more detail with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown. However, the present invention may be implemented in many different forms and should not be construed as necessarily being limited to the exemplary embodiments disclosed herein. On the contrary, these exemplary embodiments are merely provided to illustrate the present invention and to convey the concept of the present invention to those skilled in the art.

[0028] As used herein, with reference to the human body and the components described herein that are intended to be implanted in the human body, the terms "proximal end P" and "distal end D" are defined relative to the patient's torso during the implantation surgery, wherein the term "proximal end P" is the end closer to the heart position, and the term "distal end D" is the end farther from the heart position, on this basis, the term "proximal end P" and the term "distal end D" jointly define the proximal-distal direction DP; the term "inner end M" and the term "outer end L" are defined relative to the patient's sagittal plane, wherein the term "inner end M" refers to the side closer to the sagittal plane, and the term "outer end L" refers to the side farther from the sagittal plane, on this basis, the term "inner end M" and the term "outer end L" jointly define the inward-outward direction ML; the term "front end F" and the term "back end B" are defined relative to the patient's orientation, wherein the term "front end F" refers to the direction facing the patient, and the term "back end B" refers to the direction facing away from the patient, on this basis, the term "front end F" and the term "back end B" jointly define the anterior-posterior direction FB. In the above definition, the "sagittal plane" is an imaginary vertical plane passing through the middle of the body or body structure, which divides the body or body structure into left and right halves. However, it is worth noting that the above definition of relative orientation is only given for the purpose of better illustrating the technical solution of the present invention through the accompanying drawings, and it should not be interpreted as limiting the scope of protection of the present invention in any way.

[0029] refer to Figure 1-Figure 4 According to one aspect of the present invention, an intramedullary nail aiming device is provided, which generally includes a connecting device 100 and an aiming arm 200 and a handle 300 connected by the connecting device 100. Next, each component is described in detail.

[0030] Reference below Figure 1 The handle 300 of the intramedullary nail aiming device is described. Figure 1 As shown, the handle 300 is generally U-shaped, and in the case shown in the figure, the opening of the U-shaped structure faces the distal direction D. The handle 300 includes an outer end 310 and an inner end 320 separated along the inner-outer direction ML, and a gripping portion 330 connecting the outer end 310 and the inner end 320, wherein the outer end 310 is used to engage the connecting device 100, the inner end 320 is used to engage the intramedullary nail 400 to be implanted, and the gripping portion 330 is used to engage the hand of an operator (e.g., a surgeon).

[0031] Optionally, one or more proximal aiming holes 340 in the form of through holes are provided on the outer end portion 310 of the handle 300. When the intramedullary nail 400 to be implanted is fixed to the inner end portion 320 (for example, by threaded connection, snap fit, friction fit, etc.), the proximal aiming hole 340 is aligned with the proximal screw hole 440 in the intramedullary nail 400. The so-called "alignment" means that the proximal aiming hole 340 is coaxial with the proximal screw hole 440, such as Figure 1 As shown in the reference axis X1-X1' in the figure, when the intramedullary nail 400 is implanted in the patient's body (for example, implanted in the patient's fractured femur), the guide sleeve can be inserted into the proximal aiming hole 340 and the guide sleeve can be extended toward the proximal screw hole 440. At this time, the guide sleeve, the proximal aiming hole 340 and the proximal screw hole 440 are coaxial, so that the proximal bone screw can move toward the proximal screw hole 440 in the guide sleeve and finally pass through the proximal screw hole 440 to be screwed into the bone (for example, femur), thereby fixing the intramedullary nail 400 in the patient's body at the proximal end. Therefore, when performing proximal fixation of the intramedullary nail, the proximal aiming hole 340 on the handle 300 can be directly used to guide the guide sleeve and the proximal bone screw. However, in the prior art, the proximal aiming device needs to be fixed to the handle first, and then the aiming hole on the proximal aiming device is used to guide the guide sleeve and the proximal bone screw for proximal fixation of the intramedullary nail. After the proximal fixation of the intramedullary nail is completed, the proximal aiming device needs to be removed, and then the distal aiming device needs to be fixed to the handle, and then the aiming hole of the distal aiming device is used to guide the guide sleeve and the distal bone screw for distal fixation of the intramedullary nail. Therefore, the aiming device in the prior art is cumbersome and time-consuming to use. In comparison, the intramedullary nail aiming device of the present invention is simple and convenient to use, and does not need to be repeatedly disassembled and assembled, which greatly saves operation time, reduces the burden of surgeons and the pain of patients.

[0032] In particular, if Figure 1 and Figure 2 As shown, a guide pin hole 350 is also provided on the outer end 310 of the handle 300. Thus, a guide pin can be introduced into the guide pin hole 350 to provide a reference for the X-ray device when the X-ray device is used during surgery, thereby ensuring that the surgery can be performed more smoothly.

[0033] Next, refer to Figure 1 and Figure 2 The aiming arm 200 of the intramedullary nail aiming device is described. Figure 1 and Figure 2As shown, the aiming arm 200 is generally in the shape of a column extending along the distal-proximal direction DP. The aiming arm 200 has a distal aiming hole 210 (four of which are shown in the figure) in the form of a through hole at its distal end, wherein the distal aiming hole 210 is used to align with the distal screw hole 410 in the intramedullary nail 400. Further, after the doctor selects the intramedullary nail 400 to be implanted for the patient according to the preoperative and / or intraoperative planning, the aiming arm 200 is clamped into the connecting device 100 at a position corresponding to the selected intramedullary nail 400, so that after the intramedullary nail 400 is fixed to the inner end portion 320 of the handle 300, each distal aiming hole 210 can be aligned with the corresponding distal screw hole 410, as shown in FIG. Figure 1 As shown in the reference axes X2-X2', X3-X3', X4-X4' and X5-X5'.

[0034] In particular, if Figure 1 and Figure 2 As shown, the aiming arm 200 is provided with a plurality of positioning structures (e.g., grooves or bosses) 225 distributed along the length direction thereof (the distal-proximal direction DP shown in the figure), wherein each positioning structure 225 corresponds to an intramedullary nail 400 and is configured to cooperate with the interface 125 of the rotating portion 120 of the connecting device 100 as further described below, so as to position the aiming arm 200 relative to the intramedullary nail 400. Therefore, after the doctor selects the intramedullary nail 400 to be implanted for the patient according to the preoperative and / or intraoperative planning, the aiming arm 200 is clamped into the connecting device 100 at the positioning structure 225 corresponding to the selected intramedullary nail 400, so that after the intramedullary nail 400 is fixed to the inner end portion 320 of the handle 300, each distal aiming hole 210 can be aligned with the corresponding distal screw hole 410. In addition, the reason why multiple positioning structures 225 are provided is to enable the intramedullary nail aiming device to cooperate with a variety of intramedullary nails, that is, multiple positioning structures 225 correspond to intramedullary nails of a variety of different sizes (specifically, different sizes along the proximal and distal directions DP). As mentioned above, each positioning structure 225 corresponds to an intramedullary nail of one size. It is worth noting that although 9 positioning structures 225 are shown in the figure, in other embodiments, the number of positioning structures 225 can be changed according to the optional intramedullary nail type. For example, if there are N optional intramedullary nails, then N positioning structures 225 can be provided. Therefore, embodiments in which any number of positioning structures 225 are provided should be considered to be under the teachings of the present invention and are therefore included in the scope of the present invention.

[0035] Optionally, the surface of the aiming arm 200 is provided with a number of the intramedullary nail corresponding to each positioning structure 225, such as the numbers "30, 32, 34, 36, 38, 40, 42, 44, 46" on the upper surface of the aiming arm 200 as shown in the figure. Therefore, after the doctor selects the intramedullary nail to be implanted, the corresponding positioning structure 225 can be more conveniently found according to the number of the intramedullary nail, so as to perform subsequent surgery faster, thereby improving the efficiency of the surgery.

[0036] Optionally, the aiming arm 200 is oriented with respect to an imaginary plane IP ( Figure 2 As shown in the figure, the aiming arm 200 is symmetrical. Thus, the aiming arm 200 can be applied to both the intramedullary nail implantation surgery on the left limb of the patient and the intramedullary nail implantation surgery on the right limb of the patient. In particular, the outer surfaces of the aiming arm 200 on both sides of the imaginary plane IP are provided with symbols "L" and "R" representing whether it is applied to the left limb implantation surgery or the right limb implantation surgery, and these two symbols can be set so that when the aiming arm 200 is used for the left limb implantation surgery, the symbol "L" faces the operator; when the aiming arm 200 is used for the right limb implantation surgery, the symbol "R" faces the operator. For example, in Figure 1 and Figure 2 In the case of the right limb implantation operation shown in FIG, the symbol "R" set on the outer surface of the aiming arm 200 faces the operator in the outer end direction. Due to the setting of this symbol, the operator can quickly and accurately determine the setting direction of the aiming arm, and thus ensure that the implantation operation is carried out smoothly.

[0037] In particular, if Figure 1 and Figure 2 As shown, a guide pin hole 220 is also provided on the aiming arm 200. Thus, a guide pin can be introduced into the guide pin hole 220 to provide a reference for the X-ray device when the X-ray device is used during surgery, thereby ensuring that the surgery can be performed more smoothly.

[0038] Next, refer to Figure 1-Figure 4 The connecting device 100 is described. As shown in the figure, the connecting device 100 includes a fixing portion 110, such as Figure 1-Figure 2As shown, the fixing portion 110 is configured to be fixed to the outer end portion 310 of the handle 300. For example, the fixing portion 110 can be fixed to the outer end portion 310 of the handle 300 by a detachable connection method such as a threaded connection or a snap connection. In particular, the fixing portion 110 has at least two fixing pins 111 with openings at the ends thereof provided on its outer surface, wherein the ends of each fixing pin 111 are divided into a plurality of petals by its openings, and when the fixing pin 111 is inserted into the corresponding receiving hole 311 in the outer end portion 310, the plurality of petals at the ends of the fixing pin 111 are pressed by the hole wall of the receiving hole 311 and approach each other, but due to the effect of the elastic restoring force, the plurality of petals tend to separate from each other, so the elastic restoring force presses the plurality of petals against the hole wall, so that the fixing pin 111 is firmly held in the corresponding receiving hole 311. Thus, the fixing portion 110 can be fixed to the outer end portion 310 and removed from the outer end portion 310 in a simple plug-in and pull-out manner, which greatly simplifies the assembly process of the intramedullary nail aimer.

[0039] Optionally, when the doctor selects a short-sized intramedullary nail as the intramedullary nail to be implanted, the receiving hole 311 can also be configured to point to the distal screw hole of the intramedullary nail when the short-sized intramedullary nail is coupled to the inner end 320 of the handle 300. In this way, when the intramedullary nail 400 is short and the aiming arm 200 is not required to aim at its distal screw hole 410, the receiving hole 311 on the handle 300 can be used to aim at the distal screw hole 410 of the intramedullary nail 400. In this way, the intramedullary nail aimer can be applied to a wide range of intramedullary nails 400.

[0040] Further, the connection device 100 further includes a rotating portion 120, the rotating portion 120 is rotatably fixed to the fixed portion 110 so that the rotation axis XX' of the rotating portion 120 is fixed relative to the fixed portion 110, and the rotating portion 120 is configured to clamp the aiming arm 200 so as to drive the aiming arm 200 to rotate around the rotation axis XX'. In particular, the rotating portion 120 includes a main body portion 121, wherein a pair of opposite main body portion side walls 121a, 121b of the main body portion 121 define an open groove 123 therebetween, and the aiming arm 200 is configured to be clamped in the groove 123 by the main body portion side walls 121a, 121b. In particular, the rotating portion 120 further includes a temporary fixing device 124 disposed in one or both of the side walls 121a, 121b of the main body, and the temporary fixing device 124 includes a top ball 124a that is elastically biased so as to protrude from the side walls 121a, 121b of the main body into the groove 123. When the aiming arm 200 is inserted into the groove 123, the top ball 124a will be pushed back by the aiming arm 200, so that the top ball 124a will be elastically biased so as to abut against the aiming arm 200, thereby achieving temporary fixation of the aiming arm 200, thereby facilitating adjustment by the doctor during surgery. In particular, the rotating portion 120 further includes an interface (e.g., a boss disposed in the groove 123, or an opening disposed in the side walls 121a, 121b of the main body and / or the bottom wall 121c of the main body) 125, wherein the interface 125 is configured to cooperate / engage with a positioning structure 225 of the aiming arm 200 corresponding to the intramedullary nail 400 to be implanted, thereby ensuring that the aiming arm 200 is properly positioned relative to the rotating portion 120, and the so-called “proper positioning” means that the distal aiming hole 210 of the aiming arm 200 can be aligned with the distal screw hole 410 of the intramedullary nail 400 to be implanted after the intramedullary nail 400 to be implanted is fixed to the inner end portion 320. Optionally, the rotating portion 120 also includes a coupling portion 122 extending from a main body bottom wall 121c of the main body 121 connecting the pair of main body side walls 121a, 121b in a direction opposite to the groove 123, and the coupling portion 122 is configured to couple with a driving portion 130 of the connecting device 100 so that the driving portion 130 can drive the rotating portion 120 to rotate around the rotation axis XX', as further described below.

[0041] Alternatively, if Figure 4As shown, the rotating part 120 is rotatably fixed to the fixed part 110 by a pair of fastening screws 140. More specifically, the fastening screw 140 includes a nail cap 141 and a cylindrical nail body 142 protruding from the nail cap 141, wherein the middle portion 142a of the cylindrical nail body 142 is threaded so as to engage with the corresponding threaded hole 112 in the fixed part 110, and the end portion 142b of the cylindrical nail body 142 is smooth so as to be inserted into the corresponding receiving hole 126 in the side walls 121a, 121b of the main body, thereby serving as a pivot axis of the rotating part 120. Figure 3 and Figure 4 As shown, the fastening screw 140 is screwed into the fixing part 110 from the outside. When the knob is in place, the threaded portion 142a of the cylindrical nail body 142 engages with the threaded hole 112 of the fixing part 110, and its smooth portion 142b is inserted into the side walls 121a, 121b of the main body of the rotating part 120.

[0042] Optionally, the connection device 100 further includes a driving portion 130, which is also rotatably fixed to the fixed portion 110 and coupled to the rotating portion 120, so that the rotation of the driving portion 130 can be converted into the rotation of the rotating portion 120. Optionally, the driving portion 130 includes a hand wheel 131 configured to engage the hand of an operator, a rotating wheel 132 protruding from the hand wheel 131 and rotatably fixed to the fixed portion 110, and a detour structure (e.g., a detour groove or a detour protrusion) 133 provided in the end of the rotating wheel 132, and the coupling portion 122 includes a coupling rod 122a coupled to the bottom wall 121c of the main body portion and a coupling structure (e.g., a coupling protrusion or a coupling groove) 122b protruding from the coupling rod 122a, wherein the detour structure 133 couples / engages the coupling portion 122. 22, so that when the operator turns the hand wheel 131 to rotate the rotating wheel 132, the coupling structure 122b will move along the detour structure 133, at this time, the detour configuration of the detour structure 133 will cause the distance between the coupling structure 122b and the center of the rotating wheel 132 to change, and further because the rotation axis XX' of the coupling structure 122b is fixed, the change in the distance between the coupling structure 122b and the center of the rotating wheel 132 will be converted into the rotation of the coupling structure 122b, that is, the rotating part 120 around the rotation axis XX'. Therefore, according to the above configuration, the rotating part 120 can be rotated by rotating the hand wheel 131, which will also cause the aiming arm 200 to rotate when the aiming arm 200 is clamped in the rotating part 120. In addition, due to the configuration of the above-mentioned detour structure 133 and the coupling structure 122b received therein, the rotation of the rotating part 120 and the aiming arm 200 changes continuously and stably, and the rotating part 120 and the aiming arm 200 can only be rotated by rotating the driving part 130, and the driving part 130 cannot be rotated by rotating the rotating part 120 and the aiming arm 200. That is, after the operator rotates the aiming arm 200 to the desired position (for example, the position of the distal aiming hole 210 aligning with the distal screw hole 410) by rotating the driving part 130, as long as the driving part 130 is no longer rotated, the aiming arm 200 will be locked in the current position, and will not deviate from the current position due to factors such as the operator accidentally touching the aiming arm 200 or the gravity of the aiming arm 200 itself. That is to say, the above-mentioned configuration realizes the self-locking of the aiming arm 200, which greatly reduces the burden on doctors, thereby enabling intramedullary nail implantation surgery to be performed more conveniently and smoothly.

[0043] Alternatively, if Figure 3 and Figure 4As shown, the connection device 100 further includes a limiting device 150 fixed to the fixing portion 110, wherein the limiting device 150 includes a limiting top bead 151 elastically biased from the inside thereof, and the limiting top bead 151 is configured to be received by one of a plurality of limiting grooves 131a uniformly distributed along the circumferential direction on the end surface of the rotating wheel 131, in other words, configured to be engaged in one of the plurality of limiting grooves 131a. Thus, when the operator rotates the rotating wheel 131, it is necessary to overcome the elastic force biasing the limiting top bead 151 into the limiting groove 131a, which can prevent the operator from accidentally touching the rotating wheel 131 and causing the aiming arm 200 to deviate from the desired position, thereby improving the stability of the intramedullary nail aiming device.

[0044] Optionally, the connecting device 100 further includes a locking device 160, wherein the locking device 160 includes a cam portion 161 rotatably fixed to the fixing portion 110 and a handle portion 162 extending from the cam portion 161. For example, by rotating the handle portion 162 to rotate the cam portion 161, the cam portion 161 will switch between two positions (i.e., a locking position and a releasing position). In the locking position, the cam portion 161 squeezes the aiming arm 200 so as to lock the aiming arm 200 and the rotating portion 120 together relative to the fixing portion 110; in the releasing position, the cam portion 161 is disengaged from contact with the aiming arm 200 so as to allow the aiming arm 200 and the rotating portion 120 to rotate relative to the fixing portion 110. In this way, the aiming arm 200 can be conveniently locked and released relative to the fixing portion 110 by rotating the locking device 160. For example, when the aiming arm 200 is rotated to a desired position (for example, the distal aiming hole 210 is aligned with the position of the distal screw hole 410), the aiming arm 200 can be locked at the desired position by rotating the locking device 160, thereby more thoroughly preventing the aiming arm 200 from deviating from the current position due to factors such as the operator accidentally touching the aiming arm 200 or the gravity of the aiming arm 200 itself, which greatly reduces the burden on doctors, thereby enabling intramedullary nail implantation surgery to be performed more conveniently and smoothly.

[0045] Alternatively, if Figure 5As shown, the rotating portion 120 is also provided with scale lines 127 arranged around its rotation axis XX' for indicating its rotation angle. More specifically, the scale lines 127 are arranged on one or both of a pair of opposite main body side walls 121a, 121b of the main body 121. In addition, the fixed portion 110 is provided with a window 113 for exposing the scale lines 127 so that the scale lines 127 are visible from the outside. In particular, a pointer 113a is provided on the side wall of the window 113. Therefore, through the arrangement of the scale lines 127, the window 113 and in particular the pointer 113a, the operator can easily know the rotation angle of the rotating portion 120, that is, the aiming arm 200, so that the rotation angle of the aiming arm 200 can be adjusted more accurately and more specifically. In addition, as still shown in the Figure 5 As shown, the driving portion 130 is also provided with scale lines 131 b indicating its rotation angle. More specifically, the scale lines 131 b are provided on the outer surface of the rotating wheel 131 facing the operator.

[0046] Furthermore, if Figure 1As shown, after the intramedullary nail 400 to be implanted is mounted to the inner end portion 320 of the handle 300, the rotation axis XX' of the rotating portion 120 points to or passes through the anterior arch bending starting position S of the intramedullary nail 400. As is well known, the medullary cavity generally has a natural inclination, so the intramedullary nail 400 will also be tilted after being implanted into the medullary cavity, and the so-called anterior arch bending starting position S, as the name implies, refers to the starting position where the intramedullary nail 400 tilts after being implanted into the medullary cavity. In other words, the intramedullary nail 400 will tilt around its anterior arch bending starting position S after being implanted into the medullary cavity. Since the rotation axis XX' passes through the anterior arch bending starting position S, the intramedullary nail 400 can tilt around the rotation axis XX' after being implanted into the medullary cavity. In order to define the anterior arch bending starting position S on the intramedullary nail 400, for example, a narrowed portion can be processed on the intramedullary nail 400, such as a portion that locally reduces the diameter of the intramedullary nail, etc. In this way, multiple intramedullary nails 400 can have the same anterior arch bending starting position S, that is, the distance between the proximal ends of multiple intramedullary nails 400 and their anterior arch bending starting positions S is substantially the same. Further, since the aiming arm 200 is clamped to the rotating portion 120 at a position (e.g., the positioning structure 225) corresponding to the intramedullary nail 400 to be implanted, the distal aiming hole 210 of the aiming arm 200 can be aligned with the distal screw hole 410 of the intramedullary nail 400 when the intramedullary nail 400 is fixed to the inner end portion 320 but not implanted into the bone marrow cavity. However, as described above, after being implanted into the medullary cavity, the intramedullary nail 400 may tilt around the rotation axis XX', and at this time, the aiming arm 200 may be driven by the rotating portion 120 to rotate around the rotation axis XX' as well, so that the distal aiming hole 210 of the aiming arm 200 can be aligned with the distal screw hole 410 of the intramedullary nail 400 again, without generating an axial deviation between the distal aiming hole 210 and the distal screw hole 410 as in the prior art described below. Although the arrangement of the intramedullary nail aiming device is described above for one intramedullary nail selected from a plurality of intramedullary nails to which the intramedullary nail aiming device is applicable, it can be understood that the above arrangement is applicable to any intramedullary nail selected from the plurality of intramedullary nails. That is to say, for any intramedullary nail selected from the plurality of intramedullary nails, after the intramedullary nail and the connecting device 100 are mounted on the handle 300, the rotation axis XX' of the rotating portion 120 of the connecting device 100 is fixed relative to the handle 300 and points to (or passes through) the starting position of the anterior arch bending of the intramedullary nail; and further, after the aiming arm 200 is fixed to the rotating portion 120 at a position corresponding to the intramedullary nail, the distal aiming hole 210 can be aligned with the distal screw hole of the intramedullary nail.

[0047] Through the above technical solution, after the doctor selects an intramedullary nail 400 for a patient suffering from a fracture, bone crack, etc. through preoperative and / or intraoperative planning, the intramedullary nail aimer can be assembled according to the intramedullary nail 400, and the intramedullary nail 400 can be installed on the intramedullary nail aimer. Optionally, the intramedullary nail 400 can also be installed before the intramedullary nail aimer is assembled. At this time, according to the above technical solution, the rotation axis of the aiming arm 200 (i.e., the rotation axis XX' of the rotating part 120) points to or passes through the front arch bend starting position S of the intramedullary nail 400, and the distal aiming hole 210 of the aiming arm 200 is aligned with the distal screw hole 410 of the intramedullary nail 400. However, as can be seen from the foregoing, with reference to Figure 6 As shown in the dotted line portion in FIG, after the intramedullary nail 400 is implanted in the patient's body (e.g., in the medullary cavity of the femur), due to the natural inclination of the medullary cavity, the intramedullary nail 400 will be tilted at the anterior arch bending starting position S, thereby causing the positions of the plurality of distal screw holes 410 to change. When the intramedullary nail 400 is implanted in the patient's medullary cavity, the patient's position can be adjusted so that the intramedullary nail 400 is tilted around the rotation axis XX' of the rotating portion 120 at the anterior arch bending starting position S after being implanted in the patient's body. In this case, since the distal aiming hole 210 of the aiming arm 200 has been aligned with the multiple distal screw holes 410 when the intramedullary nail 400 is not implanted, and the aiming arm 200 can be rotated around the rotation axis XX' pointing to or passing through the anterior arch bending starting position S with the help of the rotating part 120, the distal aiming hole 210 can still be aligned with the multiple distal screw holes 410 at the same time after the aiming arm 200 is rotated by an appropriate angle (in the process of alignment, it may be necessary to use radiation to observe the positions of the aiming hole and the screw holes), unlike the aiming device in the prior art shown by the double-dash line, which does not cause a deviation between the axial position of the aiming hole and the axial position of the distal nail hole after rotation due to the rotation axis S' of the aiming arm not being aligned with the anterior arch bending starting position S, and the axial deviation may cause difficulty in bone screw implantation or even implantation failure, or the doctor may force the bone screw to be implanted, thereby causing scratches on the surface of the intramedullary nail and thus affecting its service life. In general, by using the intramedullary nail aimer of the present invention, after the intramedullary nail is implanted in the patient's body, the distal aiming holes on the aiming arm can still be completely aligned with the distal screw holes on the intramedullary nail, so that the implantation of the bone screws (especially the distal bone screws) can be carried out smoothly, and the intramedullary nail is protected from being damaged by the bone screws, thereby extending its service life. At the same time, since the operation can be carried out smoothly, the exposure time of doctors and patients to radiation can be shortened.

[0048] According to another aspect of the present invention, a bone treatment system is provided, which includes the intramedullary nail aiming device as described above and one or more intramedullary nails applicable to the intramedullary nail aiming device, wherein the doctor can select any intramedullary nail from the one or more intramedullary nails as the intramedullary nail 400 to be implanted according to preoperative and / or intraoperative planning, the intramedullary nail 400 to be implanted is combined with the inner end 320 of the handle 300, the fixing portion 110 of the connecting device 100 is fixed to the outer end 310 of the handle 300, so that the rotation axis XX' of the rotating portion 120 of the connecting device 100 is fixed relative to the handle 300 and aligned with the front arch bending starting position S of the intramedullary nail 400 to be implanted, and the aiming arm 200 is fixed to the rotating portion 120 of the connecting device 100 at a position corresponding to the intramedullary nail 400 to be implanted, so that the distal aiming hole 210 of the aiming arm 200 is aligned with the distal screw hole 410 of the intramedullary nail 400 to be implanted.

[0049] The above describes in detail with the aid of the accompanying drawings a preferred but non-limiting embodiment of the intramedullary nail aimer according to the present invention and a bone treatment system including the same. For those of ordinary skill in the art, modifications and additions to the technology and structure should obviously be considered to be included in the scope of the present invention without departing from the scope and essence of the present disclosure as set forth in the following claims. Therefore, these modifications and additions that can be conceived under the teachings of the present invention should be considered as part of the present disclosure. The scope of the present disclosure is defined by the claims attached hereto, and includes equivalent technologies known at the filing date of the present disclosure and equivalent technologies that have not yet been foreseen.

Claims

1. An intramedullary nail aimer, which is suitable for a variety of intramedullary nails, wherein: The intramedullary nail aiming device comprises: A handle (300) having an outer end (310) and an inner end (320), wherein the inner end (320) is adapted to engage any intramedullary nail (400) selected from the plurality of intramedullary nails; A connecting device (100), comprising a fixing portion (110) and a rotating portion (120) rotatably coupled to the fixing portion (110), wherein the fixing portion (110) is fixed to the outer end portion (310) so as to position a rotation axis (XX') of the rotating portion (120) to point to a front arch bending starting position (S) of the intramedullary nail (400) when the intramedullary nail (400) is coupled to the inner end portion (320); and an aiming arm (200), wherein the aiming arm (200) is clamped to the rotating portion (120) at a position corresponding to the intramedullary nail (400) so that a plurality of distal aiming holes (210) of the aiming arm (200) are aligned with a plurality of distal screw holes (410) of the intramedullary nail (400) when the intramedullary nail (400) is engaged with the inner end portion (320), The outer end portion (310) of the handle (300) is provided with a proximal aiming hole (340) for aiming at the proximal screw hole (440) of the intramedullary nail (400). The outer end portion (310) of the handle (300) is also provided with a guide needle hole for introducing a guide needle, and The aiming arm (200) further comprises a plurality of positioning structures (225) corresponding to the plurality of intramedullary nails, and the aiming arm (200) is clamped to the rotating part (120) at the positioning structures (225) corresponding to the intramedullary nail (400).

2. The intramedullary nail aiming device according to claim 1, wherein: The rotating portion (120) also includes an interface (125) for engaging the positioning structure (225).

3. The intramedullary nail aiming device according to claim 1 or 2, wherein: The fixing portion (110) further comprises a positioning pin (111) with an opening at an end, wherein the positioning pin (111) is inserted into a receiving hole (311) in the outer end portion (310) so as to fix the fixing portion (110) to the outer end portion (310).

4. The intramedullary nail aiming device according to claim 1 or 2, wherein: The rotating part (120) is also provided with a scale line (127) for indicating its rotation angle, and the fixed part (110) is provided with a window (113) for exposing the scale line (127) so as to make it visible from the outside.

5. The intramedullary nail aiming device according to claim 1 or 2, wherein: The connecting device (100) further comprises a locking device (160) rotatably coupled to the fixing portion (110), wherein the locking device (160) is configured to switch between a locking position and a releasing position by rotation, wherein in the locking position, the locking device (160) presses the aiming arm (200), thereby locking the aiming arm (200) and the rotating portion (120) together relative to the fixing portion (110); and in the releasing position, the locking device (160) is disengaged from contact with the aiming arm (200), thereby enabling the aiming arm (200) and the rotating portion (120) to rotate relative to the fixing portion (110).

6. The intramedullary nail aiming device according to claim 1 or 2, wherein: The rotating portion (120) further includes a top ball (124a) elastically biased to abut against the aiming arm (200).

7. A bone treatment system, comprising the intramedullary nail aiming device according to any one of claims 1 to 6 and an intramedullary nail to which the intramedullary nail aiming device is applicable.

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