Cutting load control device for device for removing acetabular cup of artificial hip joint

Abstract

A cutting load control device for a device for removing an acetabular cup of an artificial hip joint, according to an embodiment of the present invention, comprises: a main shaft that can be rotated by a driving force of a driving unit; a cutter unit that is provided with a cutter and mounted on the distal end of the main shaft, can be tilted, and is rotated by the main shaft; and an adjustment unit that adjusts the tilt angle of the cutter unit while moving forward and backward relative to the main shaft. The cutting load control device includes: an adjustment unit-driving unit that can apply a force to the adjustment unit and move the adjustment unit forward; a sensor unit for measuring the load applied to the cutter; a control unit that controls the force applied to the adjustment unit by the adjustment unit-driving unit according to the value of the load measured by the sensor unit; and a case unit in which the control unit is located.

Description

Cutting load control device for acetabular cup removal device of artificial hip joint

[0001] The present invention relates to a cutting load control device for an acetabular cup removal device of an artificial hip joint, and more specifically, to a device capable of controlling the cutting load acting on a blade during an acetabular cup removal procedure of an artificial hip joint.

[0002] Generally, an artificial hip joint is a replacement device that can be implanted in the place where the hip joint was located to maintain normal activity when hip joint function is impaired.

[0003] This artificial hip joint is divided into a hemispherical acetabular cup equipped with a liner that acts as a bearing and is inserted into the acetabular region of the pelvis, a stem fitted onto the femur, and a hemispherical head that is provided at the end of the stem to replace the femoral head and is inserted into the acetabular cup.

[0004] Therefore, patients who experience pain in the hip joint due to dysfunction caused by arthritis, dysplasia, trauma, or sequelae of infection can restore joint mobility and eliminate pain by replacing the painful hip joint with the artificial hip joint described above.

[0005] Meanwhile, these artificial hip joints experience wear and tear with long-term use. In particular, the acetabular cup, which rubs against the head, has a high rate of wear due to continuous joint use; if this wear persists, severe osteolysis may occur around the acetabulum of the pelvis where the cup is inserted. Therefore, technologies for removing the previously inserted acetabular cup from the acetabulum of the pelvis are continuously being developed.

[0006] In this regard, the applicant has developed an acetabular cup removal device for an artificial hip joint disclosed in Korean Registered Patent Publication No. 2103774. The acetabular cup removal device is illustrated in FIGS. 1 to 3, and these figures correspond to FIGS. 1, FIGS. 2, and FIGS. 7 of the said Korean Registered Patent Publication, respectively. For convenience of explanation, the reference numerals used in the said Korean Registered Patent Publication have been used as they are without modification, and even if these reference numerals overlap with the reference numerals used in the description of the present invention below, they do not refer to the same components.

[0007] As illustrated in FIGS. 1 and 2, this conventional nasal cup removal device (100) includes a main drive unit (110), a main shaft (120) that can be rotated by the driving force of the main drive unit (110), a cutter unit (150) that is provided at the front end of the main shaft (120) and can be tilted along the nasal part where the nasal cup is implanted, and cuts the nasal part while being rotated by the main shaft (120), and an adjustment unit (140) that continuously moves in the forward and backward direction relative to the main shaft (120) and adjusts the tilting angle of the cutter unit (150). Additionally, the adjustment unit (140) includes a slider (141) that can move relative to the main shaft (120) in the forward and backward directions on the outer surface of the main shaft (120), a handle fixing clamp (142) that is connected to the front end so that the rear end of the slider (141) does not come off and can move relative to the main shaft (120), and a power transmission member (144) that tilts the cutter unit (150) by transmitting the moving force of the slider (141).

[0008] However, as illustrated in FIG. 3, this conventional non-clip cup removal device has a configuration in which, when a user moves the adjustment unit (140) forward to tilt the cutter unit (150) as desired, the slider (141) pushes the power transmission member (144), and the power transmission arm (1442) tilts the cutter tilting unit (1502), causing the cutter (1501) to tilt as well. When the power transmission member (144) moves forward, the elastic body (145c) is compressed. To tilt the cutter (1501) backward by a predetermined angle, the force pushing the adjustment unit (140) forward is reduced, and the cutter (1501) is automatically tilted backward by the restoring force of the elastic body (145c).

[0009] However, in the existing acetabular cup removal device, the adjustment part (140) is moved directly forward to tilt the cutter (1501). In this case, depending on the user's operation, an excessive load may be applied to the cutter (1501), which may cause deformation and breakage of the cutter (1501), and there is also a risk that an excessive load may be applied to the bone around the acetabular cup, leading to damage to the bone.

[0010] The present invention aims to solve the problems of the prior art as described above. The objective of the present invention is to provide a cutting load control device for an acetabular cup removal device for an artificial hip joint, which can appropriately adjust the cutting load acting on the blade during the acetabular cup removal procedure of an artificial hip joint.

[0011] To achieve the above objective, a cutting load adjustment device according to one embodiment of the present invention is a cutting load adjustment device for an acetabular cup removal device of an artificial hip joint, comprising: a main shaft that can be rotated by the driving force of a driving unit; a cutter unit equipped with a cutter and mounted at the distal end of the main shaft, capable of tilting and rotated by the main shaft; and an adjustment unit that moves in a forward and backward direction relative to the main shaft and adjusts the tilting angle of the cutter unit. The device is characterized by comprising: an adjustment unit driving unit capable of moving the adjustment unit forward by applying force to the adjustment unit; a sensor unit for measuring a load applied to the cutter; a control unit for controlling the force applied by the adjustment unit driving unit to the adjustment unit according to the value of the load measured by the sensor unit; and a case unit in which the control unit is located.

[0012] In addition, the above-mentioned control unit driving unit is characterized by including a power transmission unit that transmits a force to move the control unit forward, and a power transmission unit moving unit capable of moving the power transmission unit forward.

[0013] In addition, the moving part of the power transmission part is characterized by including a driven link having one end rotatably connected to the power transmission part, a driving link having one end rotatably connected to the other end of the driven link, and a driving link driving part capable of rotating the driving link.

[0014] In addition, the force transmission unit moving part is characterized by including a linear actuator with one end connected to the force transmission unit, and a linear actuator driving part that operates the linear actuator.

[0015] In addition, the sensor unit is a load cell, and the load cell is characterized by being positioned between the control unit and the force transmission unit.

[0016] In addition, the sensor unit and the power transmission unit are each characterized by being able to slide relative to the main shaft along the main shaft.

[0017] In addition, the power supply that supplies power to the control unit is characterized as being a battery provided in the case or an external power source.

[0018] In addition, the above case is characterized by being provided with a switch unit that simultaneously turns on and off the power transmission unit moving part and the main shaft driving part, or by being provided with a switch unit including a first switch that turns on and off the power transmission unit moving part and a second switch that turns on and off the main shaft driving part.

[0019] The cutting load adjustment device for an acetabular cup removal device of an artificial hip joint according to an embodiment of the present invention having the above-described configuration has the following effects.

[0020] The cutting load control device of the present invention can appropriately adjust the cutting load applied to the cutter during the procedure of removing the acetabular cup of an artificial hip joint. Accordingly, it can improve upon the problems associated with existing artificial hip joint acetabular cup removal devices, such as the potential for excessive load to be applied to the cutter, which may lead to deformation and breakage of the cutter, and the potential for excessive load to be applied to the bone surrounding the acetabular cup, which may lead to bone fracture.

[0021] Meanwhile, the present invention also includes other effects that can be expected from the above-described configuration, although not explicitly stated.

[0022] Figure 1 shows a conventional acetabular cup removal device for artificial hip joints.

[0023] FIG. 2 is a schematic cross-sectional view of the acetabular cup removal device for an artificial hip joint of FIG. 1.

[0024] FIG. 3 is an example diagram showing the operating state of the acetabular cup removal device for an artificial hip joint of FIG. 1, sequentially showing the state of tilting the cutter by moving the adjustment part forward.

[0025] FIG. 4 shows a cutting load adjustment device for an acetabular cup removal device of an artificial hip joint according to one embodiment of the present invention.

[0026] Fig. 5 is a side view of a cutting load adjustment device for an acetabular cup removal device of the artificial hip joint of Fig. 4.

[0027] FIG. 6 is an example diagram showing the operating state of an acetabular cup removal device for an artificial hip joint using the cutting load control device of FIG. 4, sequentially showing the state of tilting the cutter by moving the control part forward.

[0028] FIG. 7 is a modified example of the cutting load control device of FIG. 4.

[0029] Figure 8 is a flowchart showing the operation of the cutting load control device of Figure 4.

[0030] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0031] FIG. 4 shows a schematic diagram of a cutting load adjustment device for an acetabular cup removal device of an artificial hip joint according to one embodiment of the present invention.

[0032] A cutting load adjusting device for an acetabular cup removal device of an artificial hip joint according to one embodiment of the present invention (hereinafter simply referred to as the "cutting load adjusting device") is a cutting load adjusting device that can be applied to a conventional acetabular cup removal device of an artificial hip joint as disclosed in FIGS. 1 and 2.

[0033] For reference, as described above in [the art forming the background of the invention], the conventional artificial hip joint acetabular cup removal device comprises a main shaft (120) that can be rotated by the driving force of a driving unit (111), a cutter unit (150) equipped with a cutter (1501) and mounted on the distal end of the main shaft (120) so as to be tiltable and rotated by the main shaft (120), and an adjustment unit (140) that moves in a forward and backward direction relative to the main shaft (120) and adjusts the tilting angle of the cutter unit (150).

[0034] As shown in FIGS. 4 and 5, the cutting load control device of the present invention includes a control unit driving unit (1), a sensor unit (2), and a control unit (3) as main components.

[0035] The control unit driving unit (1) can apply force to the control unit (140) to move the control unit (140) forward (left side according to FIG. 4).

[0036] To this end, the control unit driving unit (1) includes a power transmission unit (11) that transmits a force to the control unit (140) to move the control unit (140) forward, and a power transmission unit moving unit (12) that applies a force to the power transmission unit (11) to move the power transmission unit (11) forward. Here, the power transmission unit (11) can slide relatively along the main shaft (120).

[0037] For example, as illustrated in FIG. 5, the power transmission moving part (12) includes a driven link (121) with one end rotatably connected to the power transmission part (11), a driving link (122) with one end rotatably connected to the other end of the driven link (121), and a driving link driving part (123) capable of rotating the driving link (122). Here, the driving link driving part (123) may be a motor. Alternatively, instead of the driving link and the driven link, the power transmission moving part (12) may use a linear actuator (124) driven by a motor (linear actuator driving part).

[0038] The sensor unit (2) measures the load applied to the cutter (1501). That is, the cutter (1501) cuts the non-glossy portion to which the non-glossy cup is attached by the rotation of the main shaft (120). At this time, if the adjustment unit (140) is moved forward to tilt the cutter unit (150), that is, the cutter (1501), so that the non-glossy portion is cut along the shape of the non-glossy cup, the load (resistance force) generated in the opposite direction to the tilting direction of the cutter (1501) can be measured.

[0039] The sensor unit (2) may be, for example, a load cell (2) and may be positioned between the control unit (140) and the force transmission unit (11). At this time, the distal end of the sensor unit (2) may be in contact with the control unit (140), and the proximal end may be in contact with the force transmission unit (11). In this specification, the term 'distal end' refers to a part relatively far from the user (a part relatively close to the patient's treatment site), and the term 'proximal end' refers to a part relatively close to the user (a part relatively far from the patient's treatment site).

[0040] For reference, the load cell (2) is a known component and is a sensor that converts force or load into an electrical signal, and the force applied from the outside can be detected by a strain measuring device called a strain gage inside the sensor.

[0041] In addition, the sensor part (2) can slide relative to the main shaft (120).

[0042] The control unit (3) receives the value of the load measured from the sensor unit (2) through the data line (21), and when the value of the load is an overload or underload that is outside the preset range, the control unit driving unit (1) adjusts the force applied to the control unit (140) so that the value of the load is controlled within the preset range, so that when the cutter (1501) cuts the non-glossy part along the shape of the non-glossy cup, the cutter (cutter unit) (1501) is tilted with an appropriate force.

[0043] The control unit (3) is a processing device capable of executing an operating system (OS) and one or more software applications executed on said operating system. The control unit (3) may access, store, manipulate, process, and generate data in response to the execution of the software. For ease of understanding, it has been described that one control unit (3) is used, but a person of ordinary knowledge in the art will know that the control unit may include multiple processing elements and / or multiple types of processing elements. For example, the control unit may include multiple processors or one processor and one controller.

[0044] The cutting load control device of the present invention may further comprise a case (5), and the above-described control unit (3), main shaft drive unit (111), and drive link drive unit (4), etc., may be provided in the case (5). In this case, a main shaft drive unit (motor) (111) that rotates the main shaft (120) is provided inside the case (5), and the main shaft drive unit (111) is also controlled by the control unit (3).

[0045] Meanwhile, the power supply for the control unit (3), main shaft drive unit (111), and drive link drive unit (4), etc., may be a battery (rechargeable or disposable) (7) provided in the case (5), or an external power source located outside may be used.

[0046] Additionally, the case (5) may be provided with a switch unit (6), which may include a first switch (61) for turning on and off the power transmission unit moving unit (12), specifically the motor (123), and a second switch (62) for turning on and off the main shaft driving unit (111). Alternatively, the switch unit (6) may turn on and off the power transmission unit moving unit and the main shaft driving unit simultaneously.

[0047]

[0048] Hereinafter, with reference to FIGS. 4 to 8, the operation of a cutting load control device for an acetabular cup removal device of an artificial hip joint according to one embodiment of the present invention having the configuration described above will be explained. Since the configuration and operation of an acetabular cup removal device of an artificial hip joint are disclosed in detail in Korean Registered Patent Publication No. 2103774, additional elaboration on the existing acetabular cup removal device of an artificial hip joint will be omitted to avoid obscuring the point of the present invention, and the explanation will be limited to the configuration related to the cutting load control device of the present invention when necessary. In addition, the case in which the force transmission moving part (12) is composed of a driven link (121), a driving link (122), and a driving link driving part (motor) (123) will be explained as an example. The same explanation may apply in the case where the force transmission moving part (12) is composed of a linear actuator (124) and a motor (not shown).

[0049] First, in the state as shown in FIG. 6 (a), the cutter part (150) is positioned at the patient's treatment site, and then the first switch (61) is pressed to operate the main shaft drive part (motor) (111), causing the main shaft (120) to rotate and the cutter part (150) connected to the main shaft (120) to also rotate.

[0050] Next, as shown in FIG. 6 (b) and (c), to start cutting the non-ball part, the second switch (62) is pressed to operate the control unit drive unit (1) in order to tilt the cutter unit (150), i.e., the cutter (1501) (S1 in FIG. 8). Specifically, when the second switch (62) is pressed, the drive link drive unit (motor) (123) is operated so that the drive link (122) rotates, and the power transmission unit (11) slides relative to the main shaft (120) by the driven link (121) connected thereto and moves to the distal end of the non-ball cup removal device.

[0051] Then, the power transmission unit (11) applies force to the sensor unit (2) and pushes the control unit (140) through the sensor unit (2), and the cutter unit (cutter) (150) cuts the non-spherical part while tilting.

[0052] At this time, the sensor unit (2) senses the value of the load generated by the cutter (1501) (S2 in FIG. 8).

[0053] If the control unit (3) determines that the value of the load sensed by the sensor unit (2) is an overload or underload that exceeds a predetermined range (S3 in FIG. 8), the control unit (3) controls the drive link drive unit (123) to adjust the force applied from the power transmission unit (11) to the adjustment unit (140) (S4 in FIG. 8) to prevent deformation and damage of the cutter (1501).

[0054] Conversely, if the control unit (3) determines that the value of the load sensed by the sensor unit (2) falls within a predetermined range (S5 in FIG. 8), the force applied from the power transmission unit (11) to the control unit (140) is maintained as is.

[0055] Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention.

[0056] The present invention can be used in orthopedic surgeries, including artificial hip replacement surgery.

Claims

1. A cutting load adjusting device for an acetabular cup removal device of an artificial hip joint, comprising: a main shaft capable of rotating by the driving force of a driving unit; a cutter unit equipped with a cutter and mounted at the distal end of the main shaft, capable of tilting and rotating by the main shaft; and an adjusting unit that moves in a forward and backward direction relative to the main shaft and adjusts the tilting angle of the cutter unit. The above cutting load control device is, A control unit driving unit capable of moving the control unit forward by applying force to the control unit, A sensor unit for measuring the load applied to the cutter above, A control unit that controls the force applied by the control unit driving unit to the control unit according to the value of the load measured by the sensor unit, and The case part where the above-mentioned control unit is located including A cutting load control device for an acetabular cup removal device of an artificial hip joint, characterized by 2. In Paragraph 1, The above-mentioned control unit driving unit is, A power transmission unit that transmits a force to move the above-mentioned adjustment unit forward, and A power transmission unit moving part capable of moving the above power transmission unit forward including A cutting load control device for an acetabular cup removal device of an artificial hip joint, characterized by 3. In Paragraph 2, The above-mentioned power transmission moving part A driven link, one end of which is rotatably connected to the above-mentioned power transmission part, A driving link, one end of which is rotatably connected to the other end of the above-mentioned driven link, and A drive link drive unit capable of rotating the above drive link including A cutting load control device for an acetabular cup removal device of an artificial hip joint, characterized by 4. In Paragraph 2, The above-mentioned power transmission moving part A linear actuator with one end connected to the above-mentioned force transmission unit, and A linear actuator drive unit that operates the above linear actuator including A cutting load control device for an acetabular cup removal device of an artificial hip joint, characterized by 5. In Paragraph 2, The sensor unit is a load cell, and the load cell is positioned between the control unit and the force transmission unit. A cutting load control device for an acetabular cup removal device of an artificial hip joint, characterized by 6. In Paragraph 2, Each of the sensor part and the force transmission part is capable of sliding along the main shaft relative to the main shaft. A cutting load control device for an acetabular cup removal device of an artificial hip joint, characterized by 7. In Paragraph 3, The power source supplying power to the above control unit is a battery provided in the above case or an external power source. A cutting load control device for an acetabular cup removal device of an artificial hip joint, characterized by 8. In Paragraph 2, In the above case, A switch unit is provided to simultaneously turn on and off the power transmission unit moving part and the main shaft driving part, or A switch unit comprising a first switch for turning on and off the power transmission unit moving part and a second switch for turning on and off the main shaft driving part is provided. A cutting load control device for an acetabular cup removal device of an artificial hip joint, characterized by

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