Intramedullary nail guiding device

Abstract

The present invention relates to the field of medical devices, and in particular to a calcaneal intramedullary nail guide device. The present invention provides a calcaneal intramedullary nail guide device, comprising a base, on which a calcaneal intramedullary nail support portion and a gripping portion are provided, and further comprising a calcaneal side guide portion and a calcaneal tuberosity guide portion. The calcaneal intramedullary nail guide device provided by the present invention can adjust the position of the nail in the vertical direction when the calcaneal intramedullary nail is inserted, which can not only effectively improve the stability of the fixation effect and adapt to different surgical patients, but also can accurately insert a locking screw through the guide hole, effectively saving surgical time.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, and in particular to a heel intramedullary nail guiding device and a heel intramedullary nail guiding system comprising the device. Background Art

[0002] The calcaneus is the largest of the seven tarsal bones, located at the lower back of the foot, forming the heel. The calcaneus is an irregular rectangle, narrow in front and wide in the back, and can be divided into three parts: the anterior process, the body, and the tuberosity. The calcaneus and other foot bones form the arch of the foot. The calcaneus and talus form the rear part of the longitudinal arch of the foot, bearing 60% of the weight. After a calcaneus fracture, the arch of the foot collapses and normal walking cannot be achieved.

[0003] Calcaneus fractures are the most common foot injuries, accounting for about 60% of tarsal fractures, of which 75% are intra-articular fractures. Obvious displacement of the calcaneal fracture requires surgical treatment. Open reduction and plate fixation is the "gold standard" for calcaneal fractures, but complications such as wound infection seriously affect the efficacy of surgical treatment of calcaneal fractures. Minimally invasive reduction and internal fixation can effectively treat fractures while reducing complications, and its application in the treatment of calcaneal fractures is gradually expanding.

[0004] Intramedullary fixation is an effective treatment for calcaneal fractures. In the prior art, the patient's position during intramedullary nail fixation is similar to that of plate fixation. The patient is placed in a lateral position with the affected limb straightened to facilitate the lateral and axial X-rays of the foot. The prone position can also be used, with the affected foot extended out of the operating table to avoid interference with the healthy limb. The surgical operation is mainly divided into six steps. The first step is to insert a depth-limiting guide needle into the calcaneus through the posterior and inferior edge of the heel. Its direction is about 60 degrees from the horizontal line on the side, and is located in the middle of the calcaneal tuberosity on the axial position, toward the fourth metatarsal gap. The second step is to place a traction needle. First, a 3.2mm Schein wire is vertically inserted into the calcaneal tuberosity from the outside to the inside. Note that its position is more than 10mm away from the pre-placed position of the intramedullary nail to avoid interference. If it is a tongue-shaped fracture, the position of the Schein wire can be slightly lower. Then insert another Schein wire into the center of the talar dome. Put the spreader into the Schein wire, rotate the connecting rod to spread the subtalar joint and correct the varus deformity. The third step is to insert a 10mm hollow drill through the depth limiter and open a nail channel along the guide pin direction. Withdraw the drill and remove the cancellous bone left inside for bone grafting. The fourth step is to reduce the subtalar joint. Insert a straight or curved reduction rod through the main nail channel, push the fracture fragment toward the articular surface, and perform fluoroscopy until satisfactory. If there is a fracture on the medial wall, it must be reduced first to restore the calcaneal height. The fifth step is to insert the intramedullary nail. Select the main nail of appropriate length and insert it along the pre-retained channel. It can be rotated appropriately during insertion until the ideal position. Two 1.6mm guide pins are inserted into the nail holes at both ends of the main nail through the guide arm. After verifying the position through fluoroscopy, the locking nail is screwed in. The sixth step is to perform a full-range fluoroscopy to prove that the fracture reduction and the intramedullary nail position are appropriate, then screw in the intramedullary nail tail cap and suture the incision. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a heel intramedullary nail guide device and a heel intramedullary nail guide system including the device, so as to solve the problems in the prior art.

[0006] To achieve the above-mentioned purpose and other related purposes, the present invention provides a calcaneal intramedullary nail guide device on one hand, including a base, on which a calcaneal intramedullary nail support part and a gripping part are provided, and also including a calcaneal side guide part and a calcaneal tuberosity guide part, the proximal end of the calcaneal side guide part is connected to the base via an abduction part, the calcaneal side guide part includes a plurality of calcaneal side guide holes, the extension direction of the calcaneal side guide holes matches the calcaneal side locking holes of the calcaneal intramedullary nail body to be connected to the calcaneal intramedullary nail support part, the calcaneal tuberosity guide part includes an arc-shaped guide member and a sliding member, the proximal end of the arc-shaped guide member is connected to the base, the sliding member includes a calcaneal tuberosity guide hole, the sliding member can drive the calcaneal tuberosity guide hole to rotate and can slide along the extension direction of the arc-shaped guide member, the extension direction of the calcaneal tuberosity guide hole matches the calcaneal tuberosity locking holes of the calcaneal intramedullary nail body to be connected to the calcaneal intramedullary nail support part, and the sliding member is also provided with a stopping mechanism acting on the sliding member.

[0007] In some embodiments of the present invention, the extension direction of the calcaneal lateral guide portion matches the implantation direction of the calcaneal intramedullary nail body.

[0008] In some embodiments of the present invention, the extension direction of the calcaneal lateral guide hole intersects with the implantation direction of the calcaneal intramedullary nail body, and the angle between the extension direction of the calcaneal lateral guide hole and the implantation direction of the calcaneal intramedullary nail body is 89.5-90°.

[0009] In some embodiments of the present invention, when the calcaneal intramedullary nail body is loaded on the calcaneal intramedullary nail support portion, the distance between the calcaneal side guide hole and the calcaneal intramedullary nail body is 4 to 6 cm.

[0010] In some embodiments of the present invention, the implantation direction of the calcaneal intramedullary nail body is located in a plane formed by the rotation of the calcaneal tuberosity guide hole.

[0011] In some embodiments of the present invention, when the calcaneal intramedullary nail body is loaded on the calcaneal intramedullary nail support portion, the distance between the distal end of the arc-shaped guide and the calcaneal intramedullary nail body is 3 to 10 cm.

[0012] In some embodiments of the present invention, the angles between the plane formed by the extension direction of the calcaneal side guide hole and the implantation direction of the calcaneal intramedullary nail body and the plane formed by the calcaneal tuberosity guide hole and the implantation direction of the calcaneal intramedullary nail body are 20 to 90 degrees.

[0013] In some embodiments of the present invention, the proximal end of the heel intramedullary nail support portion is connected to the base, and the distal end of the heel intramedullary nail support portion includes a heel intramedullary nail connecting portion, and the heel intramedullary nail connecting portion is detachably connected to the heel intramedullary nail body.

[0014] In some embodiments of the present invention, the heel intramedullary nail support portion is a column extending in a straight line, and the extension direction of the heel intramedullary nail support portion matches the implantation direction of the heel intramedullary nail body.

[0015] In some embodiments of the present invention, the heel intramedullary nail support portion and the gripping portion are respectively located on two sides of the base, and the extending direction of the gripping portion matches the implantation direction of the heel intramedullary nail body.

[0016] On the other hand, the present invention provides a calcaneal intramedullary nail, comprising a calcaneal intramedullary nail body and a tail cap, wherein the calcaneal intramedullary nail body comprises a guide device connecting end and a nail body insertion end, wherein the guide device connecting end cooperates with the tail cap, and the calcaneal intramedullary nail body comprises an inner cavity, wherein the extension direction of the inner cavity is consistent with the extension direction of the calcaneal intramedullary nail body, and two calcaneal tubercle locking holes are relatively arranged on the side wall of the calcaneal intramedullary nail body, and the length direction of the calcaneal tubercle locking holes is consistent with the extension direction of the calcaneal intramedullary nail body, and a plurality of pairs of calcaneal side locking holes are relatively arranged on the side wall of the calcaneal intramedullary nail body, and the distribution direction of the calcaneal side locking holes is consistent with the extension direction of the intramedullary nail body.

[0017] Another aspect of the present invention provides a calcaneal intramedullary nail guiding system, comprising the calcaneal intramedullary nail guiding device and the calcaneal intramedullary nail. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It shows a schematic diagram of the overall structure of the intramedullary nail guide device of the present invention.

[0019] Figure 2 Shown is a schematic diagram of the structure of the intramedullary nail guiding system of the present invention.

[0020] Figure 3 It shows a schematic structural diagram of the bone side guide portion and the abduction portion in the heel intramedullary nail guide device of the present invention.

[0021] Figure 4 It is a schematic diagram showing the structure of the sliding member and the stop mechanism in the intramedullary nail guide device of the present invention.

[0022] Figure 5 Shown is a schematic diagram of the structure of the intramedullary nail of the present invention.

[0023] Figure 6 It is a schematic diagram showing the use of the present invention and an intramedullary nail guide device.

[0024] Component number description

[0025] 1 Base

[0026] 2 Intramedullary nail support

[0027] 21 Connection with intramedullary nail

[0028] 3. Grip

[0029] 4 Lateral calcaneal guide

[0030] 41 Calcaneus lateral guide hole

[0031] 5 Calcaneus tuberosity guide

[0032] 51 Arc guide

[0033] 52 Slide

[0034] 521 calcaneal tuberosity guide hole

[0035] 53 Stop mechanism

[0036] 531 Shaft

[0037] 532 Fixing nut

[0038] 533 Blocking Department

[0039] 6 Outreach

[0040] 61 Connection terminal

[0041] 62 Fixing nut

[0042] 7 Intramedullary nail body

[0043] 71 Calcaneus locking hole

[0044] 72 Calcaneus tuberosity locking hole

[0045] 8 Tail Cap DETAILED DESCRIPTION

[0046] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0047] See also Figures 1 to 6. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0048] like Figure 1 to Figure 4 As shown, the first aspect of the present invention provides a calcaneal intramedullary nail guide device, including a base 1, on which a calcaneal intramedullary nail support portion 2 and a gripping portion 3 are provided, and also includes a calcaneal lateral guide portion 4 and a calcaneal tuberosity guide portion 5, the proximal end of the calcaneal lateral guide portion 4 is connected to the base 1 through an abduction portion 6, the calcaneal lateral guide portion 4 includes a plurality of calcaneal lateral guide holes 41, the extension direction of the calcaneal lateral guide hole 41 is matched with the calcaneal lateral locking hole of the calcaneal intramedullary nail body 7 to be connected to the calcaneal intramedullary nail support portion 2, and the calcaneal The tubercle guide part 5 includes an arc-shaped guide member 51 and a sliding member 52. The proximal end of the arc-shaped guide member 51 is connected to the base. The sliding member 52 includes a calcaneal tubercle guide hole 521. The sliding member 52 can drive the calcaneal tubercle guide hole 521 to rotate and can slide along the extension direction of the arc-shaped guide member 51. The extension direction of the calcaneal tubercle guide hole 521 matches the calcaneal tubercle locking hole of the calcaneal intramedullary nail body 7 to be connected to the calcaneal intramedullary nail support part 2. The sliding member 52 is also provided with a stopping mechanism 53 acting on the sliding member 52. The calcaneal intramedullary nail guide device provided by the present invention can usually be used in conjunction with a calcaneal intramedullary nail that matches it. The specific structure of the calcaneal intramedullary nail can be found below. Figure 6As shown, when the calcaneal intramedullary nail guide device is used, the calcaneal intramedullary nail body 7 can be detachably fixed on the calcaneal intramedullary nail support part 2, and the sliding member 52 is rotated, and the position of the sliding member 52 on the arc-shaped guide member 51 is adjusted, so that the calcaneal tuberosity guide hole 521 is aligned with the calcaneal tuberosity locking hole 72, and the insertion direction of the calcaneal intramedullary nail body 7 guided by the calcaneal tuberosity guide hole 521 is consistent with the preset direction, and the calcaneal side guide hole 41 is aligned with the calcaneal side locking hole 71, and then the calcaneal intramedullary nail body 7 is pushed into the nail insertion channel through the holding part 3 and the base 1, and the locking screw is inserted into the calcaneal side guide hole After the locking screw is inserted into the calcaneal tubercle guide hole 521, the locking screw inserted from the calcaneal tubercle direction can be inserted into the calcaneal tubercle locking hole 72 through the calcaneal tubercle guide hole 521 and penetrates the calcaneal intramedullary nail body 7. After the locking screw is fixed, the calcaneal intramedullary nail guide device can be pulled out, and after the broken bones are placed in the bone graft accommodating cavity, the bone graft accommodating cavity can be closed by the tail cap 8 to complete the insertion of the calcaneal intramedullary nail body 7.

[0049] In the heel intramedullary nail guide device provided by the present invention, the proximal end of the heel intramedullary nail support part 2 can be connected to the base 1, and the distal end of the heel intramedullary nail support part 2 can include a heel intramedullary nail connection part 21, and the heel intramedullary nail connection part 21 is detachably connected to the heel intramedullary nail body 7. As described above, the heel intramedullary nail body 7 corresponding to the heel intramedullary nail guide device is usually a hollow, linearly extended column, and its nail body insertion end (i.e., the other end detachably connected to the heel intramedullary nail support part) can be serrated to facilitate the insertion of the heel intramedullary nail body 7, and the shape of the other end (i.e., the guide device connection end) is usually matched with the heel intramedullary nail connection part 21 of the heel intramedullary nail support part 2, so that it can be detachably connected to the heel intramedullary nail support part 2, and can be closed by the tail cap 8. For example, the heel intramedullary nail support portion 2 can be a straight-line extending column, the extension direction of the heel intramedullary nail support portion 2 is matched with the implantation direction of the heel intramedullary nail body 7 (for example, the extension directions of the two can be consistent), the heel intramedullary nail connecting portion 21 (i.e., the end of the heel intramedullary nail support portion 2) can be sleeved with the guide device connecting end of the heel intramedullary nail body 7, and a protrusion can be provided on the outer wall of the heel intramedullary nail connecting portion 21, and a groove can be provided on the inner wall of the guide device connecting end of the heel intramedullary nail body 7, so as to ensure the fixation of the position of the heel intramedullary nail body 7 and avoid rotation; for another example, the guide device connecting end of the heel intramedullary nail body 7 can be provided with a thread that matches the tail cap 8, and the tail cap 8 is usually a screw that matches the guide device connecting end of the heel intramedullary nail body 7, and the nut thereof can be provided with a groove (for example, a hexagonal groove) so that after the heel intramedullary nail guide device is pulled out, the bone graft accommodating cavity can be closed by the tail cap 8.

[0050] In the calcaneal intramedullary nail guide device provided by the present invention, the extension direction of the calcaneal lateral guide portion 4 can usually be coordinated with the implantation direction of the calcaneal intramedullary nail body 7 (for example, the extension directions of the two can be consistent), thereby facilitating the alignment of the calcaneal lateral guide hole 41 on the calcaneal lateral guide portion 4 with the calcaneal lateral locking hole 71. The size and extension direction of the calcaneal side guide hole 41 usually have a suitable angle with the implantation direction of the calcaneal intramedullary nail body 7, so that the locking screw can be inserted from the side of the calcaneus and fix the calcaneal intramedullary nail body 7 through the calcaneal side locking hole 71. For example, the aperture of the calcaneal side guide hole 41 can be 3.4-3.6 mm, and the extension length can be 19-21 mm; for another example, the extension direction of the calcaneal side guide hole 41 usually intersects with the implantation direction of the calcaneal intramedullary nail body 7, thereby ensuring that the calcaneal side guide hole 41 can be aligned with the calcaneal side locking hole 71 on the calcaneal intramedullary nail body 7; for another example, the angle between the extension direction of the calcaneal side guide hole 41 and the implantation direction of the calcaneal intramedullary nail body 7 can be 89.5-90°, preferably 89.8-90°, so as to facilitate the introduction of the locking screw into the calcaneal side locking hole 71 during surgery. In addition, along the extension direction of the calcaneal intramedullary nail body 7, a plurality of pairs (for example, more than two pairs) of calcaneal side locking holes 71 are usually relatively and evenly arranged on the side wall thereof, so as to better fix the calcaneal intramedullary nail body 7.

[0051] In the calcaneal intramedullary nail guide device provided by the present invention, the proximal end of the calcaneal lateral guide portion 4 can be connected to the base 1 through an extension portion 6, and the extension portion 6 can usually keep the calcaneal lateral guide portion 4 and the calcaneal intramedullary nail support portion 2 or the calcaneal intramedullary nail body 7 at a suitable distance, so that when the device is used, the calcaneal lateral guide portion 4 can be located on the calcaneal side, and the calcaneal lateral guide hole 41 can point to the calcaneal side. For example, when the calcaneal intramedullary nail support portion 2 is loaded with the calcaneal intramedullary nail body 7, the distance between the calcaneal lateral guide hole 41 and the calcaneal intramedullary nail body 7 can be 4 to 6 cm; for another example, the extension portion 6 and the calcaneal lateral guide portion 4 can form an L shape as a whole, and the two ends of the extension portion 6 are respectively connected to the calcaneal lateral guide portion 4 and the base 1; for another example, the extension portion 6 can be a column, and can rotate along the central axis of the column, so that the angle of the calcaneal lateral guide portion 4 can be appropriately adjusted through the extension portion 6; for another example, the extension portion 6 and the base 1 can be spaced apart. For disassembly connection, threads may be provided on the side walls of the connecting ends of the outward extension portion 6 and the base 1, and a hole may be provided on the base 1 which matches with the connecting end of the outward extension portion 6 and passes through the base 1, so that the connecting end 61 of the outward extension portion 6 can be inserted from one side of the hole and extended from the other end, so that the outward extension portion 6 can be fixed to the base 1 by a fixing nut 62 which matches with the connecting end 61 of the outward extension portion 6, and when necessary, the connecting end of the outward extension portion 6 can be inserted from the other side of the hole, so that the left and right feet can be freely interchanged for surgery when the patient is in a side-lying position.

[0052] In the calcaneal intramedullary nail guide device provided by the present invention, as described above, the sliding member 52 includes a calcaneal tuberosity guide hole 521, and the sliding member 52 can drive the calcaneal tuberosity guide hole 521 to rotate and can slide along the extension direction of the arc-shaped guide member 51. The extension direction of the arc-shaped guide member 51 usually needs to be coordinated with the calcaneal tuberosity and the implantation direction of the calcaneal intramedullary nail body 7. The opening direction of the arc is usually toward the calcaneal intramedullary nail support part 2, thereby ensuring that the sliding member 52 can be moved to a suitable position when sliding along the arc-shaped guide member 51 to ensure that the calcaneal tuberosity guide hole 521 can be aligned with the calcaneal tuberosity at a suitable distance. For example, the implantation direction of the calcaneal intramedullary nail body 7 is located in the plane formed by the rotation of the calcaneal tuberosity guide hole 521, and the arc formed by the extension of the arc-shaped guide member 51 can also be in the plane; for another example, when the calcaneal intramedullary nail body 7 is loaded on the calcaneal intramedullary nail support part 2, the distance between the distal end of the arc-shaped guide member 51 and the calcaneal intramedullary nail body 7 can be 3 to 10 cm; for another example, the size and extension direction of the calcaneal tuberosity guide hole 521 can be matched with the calcaneal tuberosity locking hole of the implanted calcaneal intramedullary nail body 7, for example, the calcaneal tuberosity locking hole 72 needs to be in the extension direction of the calcaneal tuberosity guide hole 521 to ensure that the locking screw inserted through the calcaneal tuberosity guide hole 521 can be passed through the calcaneal tuberosity locking hole 72; for another example, the aperture of the calcaneal tuberosity guide hole 521 can be 40 mm to 50 mm, and the diameter can be 3.4 to 3.6 mm.

[0053] In the calcaneal intramedullary nail guide device provided by the present invention, the sliding member 52 may also be provided with a stop mechanism 53 acting on the sliding member 52, so that the sliding member 52 can drive the calcaneal tuberosity guide hole 521 to rotate and can slide along the extension direction of the arc-shaped guide member 51, and can be fixed at a specific position on the arc-shaped guide member 51, and the calcaneal tuberosity guide hole 521 can be adjusted to a suitable angle. For example, the arc-shaped guide member 51 may include two parallel slide rails, and the sliding member 52 may be located between the two slide rails, and the spacing between the two slide rails matches the size of the sliding member 52, so as to ensure that the two slide rails can clamp the sliding member 52. The stopping mechanism 53 may include a rotating shaft 531, a fixing nut 532 and a blocking portion 533, and the sliding member 52 may include a through hole for passing the rotating shaft 531. The rotating shaft 531 may pass through the sliding member 52 through the through hole and simultaneously extend the slide grooves of two slide rails. The rotating shaft 531 may slide along the extension direction of the arc-shaped guide member 51 while keeping its axis perpendicular to the extension direction of the arc-shaped guide member 51. The two ends of the rotating shaft 531 may be respectively provided with a blocking portion 533 and a thread matching the fixing nut 532, so that after the fixing nut 532 is threadedly connected to the rotating shaft 531, the two slide rails can clamp the sliding member 52 and fix the sliding member 52 at a suitable angle and position.

[0054] In the calcaneal intramedullary nail guide device provided by the present invention, there is usually a suitable angle between the plane formed by the extension direction of the calcaneal side guide hole 41 and the implantation direction of the calcaneal intramedullary nail body 7, and the plane formed by the calcaneal tuberosity guide hole 521 and the implantation direction of the calcaneal intramedullary nail body 7, so as to ensure that the calcaneal side guide hole 41 can be aligned with the calcaneal side, and the calcaneal tuberosity guide hole 521 can be aligned with the calcaneal tuberosity. For example, the angle between the plane formed by the extension direction of the calcaneal side guide hole 41 and the implantation direction of the calcaneal intramedullary nail body 7, and the angle between the plane formed by the calcaneal tuberosity guide hole (521) and the implantation direction of the calcaneal intramedullary nail body 7 can be 20 to 90°.

[0055] In the heel intramedullary nail guide device provided by the present invention, the position and shape of the holding portion 3 can be adjusted by those skilled in the art. For example, the heel intramedullary nail support portion 2 and the holding portion 3 are respectively located on both sides of the base, and the extension direction of the holding portion 3 is coordinated with the implantation direction of the heel intramedullary nail body 7 (for example, the extension directions of the two can be consistent or overlapped).

[0056] In the intramedullary nail guide device provided by the present invention, the material of each component can be adjusted by those skilled in the art. For example, the gripping portion 3 can be made of rubber, and the remaining parts can be made of titanium alloy.

[0057] like Figure 5As shown, the second aspect of the present invention provides a calcaneal intramedullary nail, comprising a calcaneal intramedullary nail body 7 and a tail cap 8, wherein the calcaneal intramedullary nail body 7 comprises a guide device connection end and a nail body insertion end, wherein the guide device connection end cooperates with the tail cap 8, wherein the calcaneal intramedullary nail body 7 comprises an inner cavity, wherein the extension direction of the inner cavity is consistent with the extension direction of the calcaneal intramedullary nail body 7, wherein two calcaneal tubercle locking holes 72 are arranged on the side wall of the calcaneal intramedullary nail body 7 in opposite directions, wherein the length direction of the calcaneal tubercle locking holes 72 is consistent with the extension direction of the calcaneal intramedullary nail body 7, wherein a plurality of pairs of calcaneal side locking holes 71 are arranged relatively low on the side wall of the calcaneal intramedullary nail body 7, wherein the distribution direction of the calcaneal side locking holes 71 is consistent with the extension direction of the intramedullary nail body 7. The inner cavity included in the calcaneal intramedullary nail body 7 is the bone graft accommodating cavity as described above.

[0058] In the heel intramedullary nail provided by the present invention, the heel intramedullary nail body 7 usually extends in a straight line, and its shape is usually cylindrical, for example, preferably cylindrical, and its extension length can be 5 to 8 cm, and the diameter of the cross section can be 8 to 10 mm. The extension direction of the inner cavity in the heel intramedullary nail body 7 is usually consistent with the heel intramedullary nail body 7, and extends to both ends, so that the heel intramedullary nail body 7 can form a hollow column, for example, the wall thickness of the heel intramedullary nail body 7 can be 1.9 to 2.1 mm.

[0059] In the calcaneal intramedullary nail provided by the present invention, the calcaneal side locking hole 71 can extend from the outer wall of the calcaneal intramedullary nail body 7 to the inner cavity of the calcaneal intramedullary nail body 7. The calcaneal side locking holes 71 arranged opposite to each other can usually be arranged symmetrically with respect to the central axis of the calcaneal intramedullary nail body 7. As a pair of calcaneal side locking holes 71 arranged opposite to each other, their connecting line can usually be perpendicular to the central axis of the calcaneal intramedullary nail body 7 and can intersect. The shape and size of the calcaneal side locking hole 71 usually match the cross section of the locking screw. For example, the aperture of the calcaneal side locking hole 71 can be 3.4 to 3.6 mm.

[0060] In the calcaneal intramedullary nail provided by the present invention, the calcaneal tuberosity locking hole 72 can extend from the outer wall of the calcaneal intramedullary nail body 7 to the inner cavity of the calcaneal intramedullary nail body 7. The calcaneal tuberosity locking holes 72 arranged opposite to each other can usually be arranged symmetrically with respect to the central axis of the calcaneal intramedullary nail body 7. As a pair of calcaneal tuberosity locking holes 72 arranged opposite to each other, their connecting line can usually be perpendicular to the central axis of the calcaneal intramedullary nail body 7 and can intersect. The width of the calcaneal tuberosity locking hole 72 usually matches the diameter of the cross section of the locking screw, and has a certain length in the extension direction of the calcaneal intramedullary nail body 7. For example, the width of the calcaneal tuberosity locking hole 72 can be 3.4-3.6 mm, and the dimension in the length direction can be 40-50 mm.

[0061] In the calcaneal intramedullary nail provided by the present invention, generally speaking, the angle between the line connecting the oppositely disposed calcaneal tuberosity locking holes 72 and the line connecting the oppositely disposed calcaneal side locking holes 71 in the cross-sectional direction of the calcaneal intramedullary nail body 7 can be 90±0.2°.

[0062] In the calcaneal intramedullary nail provided by the present invention, the nail body insertion end can usually be serrated, so that the calcaneal intramedullary nail can be more easily inserted. The guide device connection end is usually matched with the tail cap 8, so that after the calcaneal intramedullary nail is fixed and the bone fragments are placed in the bone graft receiving cavity, the bone graft receiving cavity can be closed by the tail cap to complete the insertion of the calcaneal intramedullary nail. For example, the guide device connection end and the tail cap 8 can be threadedly connected.

[0063] like Figure 2 As shown, the third aspect of the present invention provides a heel intramedullary nail guide system, comprising the heel intramedullary nail guide device provided by the first aspect of the present invention and the heel intramedullary nail provided by the second aspect of the present invention.

[0064] The calcaneal intramedullary nail guide device provided by the present invention can adjust the position of the nail in the vertical direction (i.e., the locking screw inserted from the calcaneal tuberosity) when the calcaneal intramedullary nail is inserted, which can not only effectively improve the stability of the fixation effect and adapt to different surgical patients, but also can accurately insert the locking screw through the guide hole, effectively saving surgical time.

[0065] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0066] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An intramedullary nail guiding system, characterized in that: The invention comprises a calcaneal intramedullary nail guide device and a calcaneal intramedullary nail, wherein the calcaneal intramedullary nail guide device comprises a base (1), wherein the base (1) is provided with a calcaneal intramedullary nail support portion (2) and a grip portion (3), and further comprises a calcaneal lateral guide portion (4) and a calcaneal tuberosity guide portion (5), wherein the proximal end of the calcaneal lateral guide portion (4) is connected to the base (1) via an extension portion (6), wherein the calcaneal lateral guide portion (4) comprises a plurality of calcaneal lateral guide holes (41), wherein the extension direction of the calcaneal lateral guide holes (41) matches the calcaneal lateral locking holes (71) of the calcaneal intramedullary nail body (7) to be connected to the calcaneal intramedullary nail support portion (2), and wherein the calcaneal tuberosity guide portion (5) comprises an arc-shaped guide member (51) and a sliding member (52), wherein the proximal end of the arc-shaped guide member (51) is connected to the base (1) via an extension portion (6), wherein the proximal end of the arc-shaped guide member (51) is connected to the proximal end of the calcaneal tuberosity guide portion (5), wherein the proximal end of the arc-shaped guide member (51) is connected to the proximal end of the calcaneal tuberosity guide portion (5). The base is connected, the sliding member (52) includes a calcaneal tuberosity guide hole (521), the sliding member (52) can drive the calcaneal tuberosity guide hole (521) to rotate, and can slide along the extension direction of the arc-shaped guide member (51), the extension direction of the calcaneal tuberosity guide hole (521) matches the calcaneal tuberosity locking hole (72) of the calcaneal intramedullary nail body (7) required to be connected on the calcaneal intramedullary nail support part (2), and the sliding member (52) is also provided with a stop mechanism (53) acting on the sliding member (52); thereby, the sliding member (52) drives the calcaneal tuberosity guide hole (521) to rotate, and when sliding along the extension direction of the arc-shaped guide member (51), it is fixed at a specific position on the arc-shaped guide member (51), and the calcaneal tuberosity guide hole (521) is adjusted to a suitable angle; The heel intramedullary nail support portion (2) and the gripping portion (3) are respectively located on two sides of the base, and the extension direction of the gripping portion (3) matches the implantation direction of the heel intramedullary nail body (7); The calcaneal intramedullary nail comprises a calcaneal intramedullary nail body (7) and a tail cap (8), the calcaneal intramedullary nail body (7) comprises a guide device connecting end and a nail body insertion end, the guide device connecting end cooperates with the tail cap (8), the calcaneal intramedullary nail body (7) comprises an inner cavity, the extension direction of the inner cavity is consistent with the extension direction of the calcaneal intramedullary nail body (7), two calcaneal tubercle locking holes (72) are arranged on the side wall of the calcaneal intramedullary nail body (7) in opposite directions, the length direction of the calcaneal tubercle locking holes (72) is consistent with the extension direction of the calcaneal intramedullary nail body (7), and a plurality of calcaneal side locking holes (71) are arranged on the side wall of the calcaneal intramedullary nail body (7), the distribution direction of the calcaneal side locking holes (71) is consistent with the extension direction of the intramedullary nail body (7); the nail body insertion end of the calcaneal intramedullary nail body (7) is serrated; The angles between the plane formed by the extension direction of the calcaneal side guide hole (41) and the implantation direction of the calcaneal intramedullary nail body (7), and the plane formed by the calcaneal tuberosity guide hole (521) and the implantation direction of the calcaneal intramedullary nail body (7) are 20 to 90 degrees.

2. The intramedullary nail guide system according to claim 1, characterized in that: The extension direction of the calcaneal lateral guide portion (4) matches the implantation direction of the calcaneal intramedullary nail body (7).

3. The intramedullary nail guide system according to claim 1, characterized in that: The extension direction of the calcaneal side guide hole (41) intersects with the implantation direction of the calcaneal intramedullary nail body (7), and the angle between the extension direction of the calcaneal side guide hole (41) and the implantation direction of the calcaneal intramedullary nail body (7) is 89.5-90°. When the calcaneal intramedullary nail body (7) is loaded on the calcaneal intramedullary nail support part (2), the distance between the calcaneal side guide hole (41) and the calcaneal intramedullary nail body (7) is 4-6 cm.

4. The heel intramedullary nail guide system according to claim 1, characterized in that: The implantation direction of the calcaneal intramedullary nail body (7) is located in the plane formed by the rotation of the calcaneal tuberosity guide hole (521); when the calcaneal intramedullary nail body (7) is loaded on the calcaneal intramedullary nail support part (2), the distance between the distal end of the arc-shaped guide member (51) and the calcaneal intramedullary nail body (7) is 3 to 10 cm.

5. The heel intramedullary nail guide system according to claim 1, characterized in that: The proximal end of the heel intramedullary nail support portion (2) is connected to the base (1), and the distal end of the heel intramedullary nail support portion (2) comprises a heel intramedullary nail connection portion (21), and the heel intramedullary nail connection portion (21) is detachably connected to the heel intramedullary nail body (7).

6. The heel intramedullary nail guide system according to claim 1, characterized in that: The heel intramedullary nail support part (2) is a column extending in a straight line, and the extension direction of the heel intramedullary nail support part (2) matches the implantation direction of the heel intramedullary nail body (7).

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