CN112294413A - A two-way adjustable elastic intramedullary nail - Google Patents
A two-way adjustable elastic intramedullary nail Download PDFInfo
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- CN112294413A CN112294413A CN202011281768.2A CN202011281768A CN112294413A CN 112294413 A CN112294413 A CN 112294413A CN 202011281768 A CN202011281768 A CN 202011281768A CN 112294413 A CN112294413 A CN 112294413A
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- 210000000988 bone and bone Anatomy 0.000 claims abstract description 89
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims description 26
- 230000003068 static effect Effects 0.000 claims description 18
- 230000002457 bidirectional effect Effects 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 239000002775 capsule Substances 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 206010017076 Fracture Diseases 0.000 abstract description 37
- 208000010392 Bone Fractures Diseases 0.000 abstract description 35
- 230000035876 healing Effects 0.000 abstract description 11
- 230000003111 delayed effect Effects 0.000 abstract description 2
- 230000035882 stress Effects 0.000 description 27
- 238000010586 diagram Methods 0.000 description 17
- 238000000034 method Methods 0.000 description 4
- 210000005077 saccule Anatomy 0.000 description 3
- 230000004938 stress stimulation Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 210000003128 head Anatomy 0.000 description 2
- 230000009894 physiological stress Effects 0.000 description 2
- 230000000638 stimulation Effects 0.000 description 2
- 206010017081 Fracture delayed union Diseases 0.000 description 1
- 206010017088 Fracture nonunion Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000018678 bone mineralization Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/72—Intramedullary devices, e.g. pins or nails
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/72—Intramedullary devices, e.g. pins or nails
- A61B17/7233—Intramedullary devices, e.g. pins or nails with special means of locking the nail to the bone
- A61B17/725—Intramedullary devices, e.g. pins or nails with special means of locking the nail to the bone with locking pins or screws of special form
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B2017/564—Methods for bone or joint treatment
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Abstract
本发明公开一种双向可调节弹性髓内钉，包括中空结构的髓内钉主钉，它包括一体结构的髓内钉近端、髓内钉主体，髓内钉近端直径大于髓内钉主体的直径，髓内钉近端处设置有贯穿的动力螺钉孔，在远离髓内钉近端的髓内钉主体上设置有调节孔，动力螺钉孔内安装有动力骨螺钉，动力骨螺钉能沿动力螺钉孔轴向移动，髓内钉近端侧安装有尾帽，尾帽与动力骨螺钉之间设置有弹性体，动力骨螺钉的下方设置有可吸收垫圈，可吸收垫圈支撑动力骨螺钉，髓内钉主体上设置有调节骨折端应力的调节装置。可根据骨折具体情况调整骨折端应力大小，避免骨折端应力遮挡，加速骨折愈合，减少骨折延迟愈合、不愈合，去除髓内钉后再骨折发生率。
The invention discloses a two-way adjustable elastic intramedullary nail, including a main intramedullary nail with a hollow structure. The diameter of the intramedullary nail is provided with a penetrating dynamic screw hole at the proximal end of the intramedullary nail, an adjustment hole is provided on the main body of the intramedullary nail away from the proximal end of the intramedullary nail, and a dynamic bone screw is installed in the dynamic screw hole. The dynamic screw hole moves axially, a tail cap is installed on the proximal side of the intramedullary nail, an elastic body is arranged between the tail cap and the dynamic bone screw, an absorbable washer is arranged under the dynamic bone screw, and the absorbable washer supports the dynamic bone screw. The main body of the intramedullary nail is provided with an adjusting device for adjusting the stress of the fracture end. The stress at the fracture end can be adjusted according to the specific conditions of the fracture to avoid stress shielding at the fracture end, accelerate fracture healing, reduce delayed fracture union and nonunion, and reduce the incidence of fracture after intramedullary nail removal.
Description
Technical Field
The invention belongs to the field of medical instruments, and particularly relates to a bidirectional adjustable elastic intramedullary nail.
Background
The bone-knitting steel plate and the method for treating the fracture by internal fixation of the intramedullary nail have been used clinically for many years, and in the clinical treatment process, a plurality of methods are used for fixing the fracture, wherein the intramedullary nail is one of the most commonly used methods, the traditional intramedullary nail fixes the fractured bone on the intramedullary nail through screws, so that the intramedullary nail and the bone are integrated, but in the later period of fracture repair, due to the stress shielding effect of the intramedullary nail, the fractured bone cannot be subjected to suitable stress stimulation, the defects of delayed healing, nonunion, slow bone mineralization, long internal fixation time, fracture after the intramedullary nail is removed and the like easily occur, and the popularization and the application of the intramedullary nail are limited. Therefore, designing an intramedullary nail capable of adjusting the stress of the fracture end according to the fracture healing condition and avoiding stress shielding is a problem to be solved urgently at present.
Disclosure of Invention
The present invention aims to provide a bidirectional adjustable elastic intramedullary nail to solve the problems mentioned above in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a bidirectional adjustable elastic intramedullary nail comprises a main intramedullary nail which is of a hollow structure, the intramedullary nail main nail comprises an intramedullary nail proximal end and an intramedullary nail main body which are of an integral structure, the diameter of the proximal end of the intramedullary nail is larger than that of the intramedullary nail main body, a plurality of penetrating power screw holes are arranged at the proximal end of the intramedullary nail, a plurality of penetrating static screw holes are arranged on the intramedullary nail main body far away from the near end of the intramedullary nail, dynamic bone screws are arranged in the dynamic screw holes, the dynamic bone screw can move along the axial direction of the dynamic screw hole, the static bone screw is arranged in the static screw hole, a tail cap is arranged at the proximal side of the intramedullary nail, an elastic body I is arranged between the tail cap and the dynamic bone screw, an absorbable washer is arranged below the powered bone screw and supports the powered bone screw.
As a further optimization of the present application, the absorbable gasket is mounted in one of the following manners: a. a boss is arranged on the inner side of the proximal end of the intramedullary nail, and an absorbable washer is arranged on the boss; b. the inner wall of the near end of the intramedullary nail is provided with internal threads, the outer side of the absorbable washer is provided with external threads, and the absorbable washer is in threaded connection with the inner wall of the near end of the intramedullary nail.
Further, the tail cap is installed in one of the following modes: a. the inner side of the near end of the intramedullary nail is provided with internal threads, the tail cap is provided with external threads matched with the internal threads, and the tail cap is in threaded connection with the near end of the intramedullary nail; b. an annular groove and a vertical guide groove communicated with the annular groove are arranged along the inner side of the near end of the intramedullary nail, and a bulge is arranged at the head end of the tail cap and can slide along the annular groove and the vertical guide groove; c. the head of the tail cap is provided with an expansion sleeve.
Further, when the power screw hole is provided with an upper through hole and a lower through hole, an upper power bone screw and a lower power bone screw are respectively arranged in the upper power screw hole and the lower power screw hole.
Further, the absorbable washers may be disposed below the upper power screw hole, or below the lower power screw hole, or both below the upper power screw hole and the lower power screw hole.
Further, an elastic body II is arranged between the absorbable washer and the upper powered bone screw or the lower powered bone screw.
Further, the first elastic body and the second elastic body can be set as one of a first pressure regulating spring, a first elastic saccule, a second pressure regulating spring and a second elastic saccule, and when the first elastic body and the second elastic saccule are spring I, the first spring I is installed in one of the following installation forms: a. a first pressure regulating spring is arranged in a containing cavity formed by the tail cap, the upper power bone screw and the inner wall of the proximal end of the intramedullary nail; b. the near end of the intramedullary nail is sleeved with a guide sleeve which can be set in a half-sleeve or full-sleeve mode, when the intramedullary nail is in a half-sleeve mode, the guide sleeve is positioned above the lower power screw hole, and a through hole corresponding to the upper power screw hole is formed in the guide sleeve; when the guide sleeve is a full guide sleeve, through holes corresponding to the upper power screw hole and the lower power screw hole are respectively formed in the guide sleeve; the guide sleeve can be an inner guide sleeve or an outer guide sleeve, and when the guide sleeve is the inner guide sleeve, the guide sleeve is sleeved on the inner side of the near end of the intramedullary nail; when the intramedullary nail is an outer guide sleeve, namely the outer guide sleeve is sleeved at the outer side of the proximal end of the intramedullary nail, the pressure regulating spring is sleeved at the proximal end of the intramedullary nail and the outer side of the tail cap, one end of the pressure regulating spring is abutted against the guide sleeve, and the other end of the pressure regulating spring is abutted against the lower part of the convex brim of the tail cap; when the elastic body I is an elastic ball bag I, the elastic ball bag I is positioned in a containing cavity formed by the tail cap, the upper power bone screw and the inner wall of the proximal end of the intramedullary nail, and a ball bag base is arranged below the elastic ball bag I and the elastic ball bag II.
Furthermore, a first magnetic body is arranged in the tail cap, the first magnetic body is fixedly connected with the tail cap, and the first magnetic body can drive the tail cap to move up and down along the proximal end of the intramedullary nail under the action of an external magnetic field.
Furthermore, an adjusting threaded sleeve is arranged below the upper power bone screw or the lower power bone screw, an elastic body II is arranged between the adjusting threaded sleeve and the upper power bone screw or the lower power bone screw, a magnetic body II is arranged in the adjusting threaded sleeve, and the adjusting threaded sleeve is in threaded connection with the proximal end of the intramedullary nail.
Further, the power screw hole is an inclined hole or a transverse hole; the side wall of the proximal end of the intramedullary nail is provided with a scale hole, and the scale hole is arranged corresponding to the elastic body.
Further, a through fixing screw hole is arranged below the power screw hole at the proximal end of the intramedullary nail, and a fixing bone screw is arranged in the fixing screw hole; the intramedullary nail main nail is set to have a curvature suitable for the human skeleton.
The intramedullary nail has the advantages of easy fixation, convenient operation, simple design structure and wide application range, can adjust the stress of the fracture end through the absorbable pad, the first elastic body and the second elastic body, avoids stress shielding of the fracture end, stimulates body tissues to form new bones so as to achieve the purpose of accelerating fracture healing, not only has the function of strong internal fixation of the intramedullary nail, but also can apply controllable proper axial stress to the fracture end, thereby avoiding the contradiction between stress shielding and stress stimulation, reducing fracture nonunion and delayed union caused by stress shielding, removing the incidence rate of fracture after intramedullary nail removal, accelerating fracture healing and shortening the fixation time of the intramedullary nail.
Drawings
FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram according to a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a fourth embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a fifth embodiment of the present invention;
FIG. 6 is a schematic structural view of the proximal end of an intramedullary nail in accordance with a sixth embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a tail cap according to a sixth embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a sixth embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a seventh embodiment of the present invention;
FIG. 10 is a schematic structural diagram of an eighth embodiment of the present invention;
FIG. 11 is a schematic structural diagram of a ninth embodiment of the present invention;
FIG. 12 is a schematic structural diagram of a tenth embodiment of the present invention;
FIG. 13 is a schematic structural diagram of an eleventh embodiment of the present invention;
FIG. 14 is a diagram illustrating a twelfth embodiment of the present invention;
FIG. 15 is a schematic structural diagram of a thirteenth embodiment of the present invention;
FIG. 16 is a schematic structural diagram of a fourteenth embodiment of the invention;
FIG. 17 is a schematic structural diagram of a fifteenth embodiment of the present invention;
FIG. 18 is a schematic structural diagram of a sixteenth embodiment of the present invention;
in the figure: 1-intramedullary nail main body, 2-tail cap, 3-intramedullary nail proximal end, 4-upper dynamic screw hole, 5-upper dynamic bone screw, 6-static screw hole, 7-fixed bone screw, 8-lower static bone screw, 9-absorbable washer, 10-bulge, 11-annular groove, 12-vertical guide groove, 13-lower dynamic screw hole, 14-lower dynamic bone screw, 15-spring I, 16-expansion sleeve, 17-lower magnetic body, 18-spring II, 19-elastic balloon I, 20-half guide sleeve, 21-full guide sleeve, 22-adjusting screw sleeve, 23-scale hole, 24-spring base and 25-upper magnetic body.
Detailed Description
In the description of the present invention, it should be noted that unless otherwise specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, integrally connected, or mechanically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.
In the first embodiment, as shown in fig. 1, a two-way adjustable elastic intramedullary nail comprises a main intramedullary nail, the main intramedullary nail is of a hollow structure, the main intramedullary nail comprises a proximal intramedullary nail end 3 and a main intramedullary nail body 1, the proximal intramedullary nail end 3 and the main intramedullary nail body 1 are of an integral structure, the diameter of the proximal intramedullary nail end 3 is greater than that of the main intramedullary nail body 1, two penetrating power screw holes are arranged at the proximal intramedullary nail end 3, power bone screws are arranged in the power screw holes, the power bone screws can move axially along the power screw holes, an upper power bone screw 5 and a lower power bone screw 14 are respectively arranged in the upper power screw hole 4 and the lower power screw hole 13, two penetrating static screw holes 6 are arranged on the main intramedullary nail body 1 far away from the proximal intramedullary nail end 3, and static bone screws are arranged in, an upper static bone screw and a lower static bone screw 8 are respectively arranged in the upper static screw hole 6 and the lower static screw, a tail cap 2 is arranged on the side of the proximal end 3 of the intramedullary nail, an internal thread is arranged on the inner wall of the proximal end 3 of the intramedullary nail, an external thread matched with the internal thread is arranged on the tail cap 2, and the tail cap 2 is in threaded connection with the proximal end 3 of the intramedullary nail.
In the embodiment, an absorbable washer 9 is arranged below the upper powered bone screw 5, the absorbable washer 9 supports the upper powered bone screw 5, and the absorbable washer 9 absorbs the axial stress which is not applied to the upper powered bone screw upwards. The inner wall of the intramedullary nail near end 3 is provided with internal threads, the outer side of the absorbable washer 9 is provided with external threads, and the absorbable washer 9 is in threaded connection with the inner wall of the intramedullary nail near end 3. A first pressure regulating spring 15 is arranged in a containing cavity formed by the tail cap 2, the upper power bone screw 5 and the inner wall of the proximal end 3 of the intramedullary nail.
When the bidirectional adjustable elastic intramedullary nail is used for fixing bones, the bidirectional adjustable elastic intramedullary nail is placed into a human fracture shaft according to the operation convention of the intramedullary nail, an intramedullary nail body 1 is fixed with one end of the fracture bone through a lower static bone screw 8, an absorbable washer 9 is implanted into a proximal end 3 of the intramedullary nail, then a lower dynamic bone screw 14 and an upper dynamic bone screw 5 which are arranged at the proximal end 3 of the intramedullary nail are used for fixing the other end of the fracture bone, a first pressure regulating spring 15 is implanted into the proximal end 3 of the intramedullary nail, a tail cap 2 is screwed in, a downward axial stress is given to the first pressure regulating spring 15, and a downward axial stress is further given to the upper dynamic bone screw 5, after the device is implanted into a human body for a period of time, the upward axial stress is not given to the upper dynamic bone screw 5 after the absorbable washer 9 is absorbed, the downward axial, The pressure regulating spring I15, the tail cap 2, the intramedullary nail proximal end 3, the intramedullary nail main body 1, the distal upper static bone screw and the distal lower static bone screw 8 are opposite to the proximal axial acting force to further apply axial stress to the distal skeleton and the fracture end, so that physiological stress stimulation and conduction always exist in the fracture healing process, and the fracture healing is promoted. The elastic force of the first pressure regulating spring 15 can be determined by controlling the screwing depth of the tail cap 2.
In the second embodiment, as shown in fig. 2, the difference from the first embodiment is that an absorbable washer 9 is arranged below the lower powered bone screw 14, the absorbable washer 9 is supported by the proximal intramedullary nail end 3 and the gradual change portion of the intramedullary nail body 1, and the upper portion of the absorbable washer 9 supports the lower powered bone screw 14. The screwed tail cap 2 gives a downward axial stress to the pressure regulating spring I15, and further gives a downward axial stress to the upper dynamic bone screw 5, the bone fixed on the proximal end 3 of the intramedullary nail is subjected to the downward axial stress given by the pressure regulating spring I15, and further gives an upward reverse axial acting force to the upper dynamic bone screw 5, the pressure regulating spring I15, the tail cap 2, the proximal end 3 of the intramedullary nail, the intramedullary nail body 1, the upper static bone screw at the distal end and the lower static bone screw 8, because the lower dynamic bone screw 14 and the absorbable washer 9 arranged below the lower dynamic bone screw have a blocking effect on the proximal end 3 of the intramedullary nail and the intramedullary nail body 1, the fracture end can not apply an axial stress, after the device is implanted into a human body for a period of time, the absorbable washer 9 is absorbed and then does not give a blocking effect to the proximal end 3 of the intramedullary nail and the intramedullary nail body 1, and further the intramedullary nail body 1 drives the, so that physiological stress stimulation and conduction exist all the time in the fracture healing process, and the fracture healing is promoted.
Third embodiment, as shown in fig. 3, the difference from the first embodiment is that an absorbable washer 9 is disposed above the upper powered bone screw 5, the absorbable washer 9 is supported by the upper powered bone screw 5, and the upper portion of the absorbable washer 9 abuts against the tail cap 2. The outer side of the near end 3 of the intramedullary nail is sleeved with a guide sleeve which is in a half guide sleeve 20 form, the half guide sleeve 20 is positioned above the lower power screw hole 13, and the half guide sleeve 20 is provided with a through hole corresponding to the upper power screw hole 4. The first pressure regulating spring 15 is sleeved on the outer sides of the proximal end 3 of the intramedullary nail and the tail cap 2, one end of the first pressure regulating spring abuts against the upper end of the half guide sleeve 20, and the other end of the first pressure regulating spring abuts against the lower edge of the tail cap 2.
In the fourth embodiment, as shown in fig. 4, the difference from the third embodiment is that a guide sleeve is sleeved outside the proximal end 3 of the intramedullary nail, the guide sleeve is in the form of a full guide sleeve 21, and the full guide sleeve 21 is provided with through holes corresponding to the upper power screw hole 4 and the lower power screw hole 13, respectively.
In the fifth embodiment, as shown in fig. 5, the difference from the fourth embodiment is that the full guide sleeve 21 is sleeved inside the proximal intramedullary nail 3, the absorbable washer 9 is disposed below the lower powered bone screw 14, the absorbable washer 9 is supported by the proximal intramedullary nail 3 and the gradual change portion of the intramedullary nail body, and the full guide sleeve 21 is supported by the upper portion of the absorbable washer 9.
Sixth embodiment, as shown in fig. 6, 7 and 8, the difference from the fifth embodiment is the installation form of the tail cap 2, in this embodiment, an annular groove 11 and a vertical guide groove 12 communicated with the annular groove 11 are arranged along the inner side of the proximal end 3 of the intramedullary nail, the head end of the tail cap 2 is provided with a protrusion 10, and the protrusion 10 can vertically slide along the vertical guide groove 12 and can rotate along the annular groove 11.
The seventh embodiment is different from the sixth embodiment in the installation form of the tail cap 2, as shown in fig. 9, an expansion sleeve 16 is arranged at the head of the tail cap 2, the tail cap 2 is in threaded connection with the expansion sleeve 16, the lower sleeve arm of the expansion sleeve 16 is thickened, the side wall is provided with a slotted hole which divides the side wall into more than 3 parts, and the lower side wall of the expansion sleeve 16 can be fixed on the inner wall of the proximal end 3 of the intramedullary nail by screwing the tail cap 2.
Eighth embodiment, as shown in fig. 10, the difference from the second embodiment lies in the form of the first elastic body, in this embodiment, the first elastic body is a first elastic capsule 19, a capsule base is disposed below the first elastic capsule 19, and the capsule base is located above the upper powered bone screw 5.
Ninth embodiment, as shown in fig. 11, the difference from the second embodiment is that an upper magnetic body 25 is fixedly disposed in the tail cap 2, and the upper magnetic body 25 can drive the tail cap 2 to move up and down along the proximal end 3 of the intramedullary nail under the action of the external magnetic field. And further, the axial stress of the fracture end is adjusted by adjusting the axial stress of the first pressure adjusting spring 15, the stress is read according to the scale holes arranged on the side wall of the near end 3 of the intramedullary nail, and the fracture end can be subjected to appropriate stress stimulation according to the fracture type and the fracture healing condition, so that the fracture healing is accelerated.
In the tenth embodiment, as shown in fig. 12, the difference from the sixth embodiment is that the proximal end 3 of the intramedullary nail is sleeved with a guide sleeve in the form of a half guide sleeve 20, the half guide sleeve 20 is located above the lower power screw hole 13, and the half guide sleeve 20 is provided with a through hole corresponding to the upper power screw hole 4. The first pressure regulating spring 15 is sleeved on the outer sides of the proximal end 3 of the intramedullary nail and the tail cap 2, one end of the first pressure regulating spring is abutted against the half guide sleeve 20, and the other end of the first pressure regulating spring is abutted against the lower edge of the tail cap 2.
Eleventh embodiment, as shown in fig. 13, the difference from the first embodiment is that an adjusting screw sleeve 22 is disposed below the upper powered bone screw 5, a second spring 18 is installed between the absorbable washer 9 and the upper powered bone screw 5, a lower magnetic body 17 is installed in the adjusting screw sleeve 22, and the adjusting screw sleeve 22 is threadedly connected to the proximal end 3 of the intramedullary nail. The lower magnetic body 17 can drive the adjusting threaded sleeve 22 to move up and down under the action of an external magnetic field, and the axial stress of the second spring 18 is adjusted, so that the upper power bone screw 5 is given different upward axial stresses, and further the axial stress of the fracture end is adjusted.
Twelfth embodiment, as shown in fig. 14, the difference from the eleventh embodiment is that an upper magnetic body 25 is fixedly disposed in the tail cap 2, and the upper magnetic body 25 can drive the tail cap 2 to move up and down along the proximal end 3 of the intramedullary nail under the action of the external magnetic field, so as to adjust the axial stress of the first spring 15, and thus the axial stress of the fracture end.
Thirteenth embodiment, as shown in fig. 15, the difference from eleventh embodiment is that an upper magnetic body 25 is fixedly disposed in the tail cap 2, and the upper magnetic body 25 can drive the tail cap 2 to move up and down along the proximal end 3 of the intramedullary nail under the action of the external magnetic field. The side wall of the proximal end 3 of the intramedullary nail is provided with a scale hole 23, and the scale hole 23 is arranged corresponding to the first spring 15. The elastic force of the first spring 15 can be determined by the screwing depth of the tail cap 2, and the stress of the fracture end can be estimated by the screwing depth of the tail cap 2.
Fourteenth embodiment, as shown in fig. 16, the difference from the second embodiment is that the power screw hole is provided as an inclined hole, the spring seat 24 below the first spring 15 is adapted to the inclination of the upper power bone screw 5, and the absorbable washer 9 is adapted to the inclination of the lower power bone screw 14.
Fifteenth embodiment, as shown in fig. 17, the difference from the fourteenth embodiment is that a guide sleeve is sleeved outside the proximal end 3 of the intramedullary nail and is provided in the form of a full guide sleeve 21, through holes corresponding to the upper power screw hole 4 and the lower power screw hole 13 are respectively provided on the full guide sleeve 21, a first pressure regulating spring 15 is sleeved outside the proximal end 3 of the intramedullary nail and the tail cap 2, one end of the first pressure regulating spring abuts against the guide sleeve 21, the other end of the first pressure regulating spring abuts against the lower brim of the tail cap 2, and the full guide sleeve 21 regulates the stress of the fracture end through the upper power bone screw 5 and the lower power bone screw 14.
Sixteenth embodiment, as shown in fig. 18, the difference from the first embodiment is that a through set screw hole is provided below the power screw hole at the proximal end of the intramedullary nail, and a fixation bone screw 7 is mounted in the set screw hole.
In the above embodiment, the intramedullary nail main nail is set to have a curvature suitable for human bones.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (11)
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| CN202011281768.2A CN112294413A (en) | 2020-11-16 | 2020-11-16 | A two-way adjustable elastic intramedullary nail |
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| CN202011281768.2A CN112294413A (en) | 2020-11-16 | 2020-11-16 | A two-way adjustable elastic intramedullary nail |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114259287A (en) * | 2021-12-24 | 2022-04-01 | 北京理贝尔生物工程研究所有限公司 | Intramedullary Nail Assembly |
Citations (5)
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| CN214511280U (en) * | 2020-11-16 | 2021-10-29 | 宋若怡 | A two-way adjustable elastic intramedullary nail |
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| WO2000061018A1 (en) * | 1999-04-09 | 2000-10-19 | Depuy Orthopaedics, Inc. | Intramedullary nail with nonmetal spacers |
| CN2746885Y (en) * | 2005-01-13 | 2005-12-21 | 朱文川 | Automatically and continuously pressing type intramedullary nail |
| US20170224394A1 (en) * | 2014-08-12 | 2017-08-10 | Nitesh Kumar Tandiya | Interlocking Nail |
| CN204049814U (en) * | 2014-09-17 | 2014-12-31 | 浙江科惠医疗器械有限公司 | A kind of automatic dynamic compress intramedullary nail |
| CN214511280U (en) * | 2020-11-16 | 2021-10-29 | 宋若怡 | A two-way adjustable elastic intramedullary nail |
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| CN114259287A (en) * | 2021-12-24 | 2022-04-01 | 北京理贝尔生物工程研究所有限公司 | Intramedullary Nail Assembly |
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