Implant extractor

Abstract

The implant extractor includes an elongated housing having a proximal end configured to connect to an instrument, a distal end having an opening for operably engaging the implant, and an elongated recess extending to the opening. A jaw is slidably received within the slot and extends to the opening. A link assembly is mounted and received within the elongated recess and pivotally attached to the jaw such that movement of the link causes the jaw to slide within the slot toward or away from the opening. A locking mechanism is included to secure the extraction instrument in a locked position when grasping an implant.

Description

Technical Field

[0001] The present disclosure relates to a surgical instrument for use in removing implants such as hip stems and artificial organs.

Background Art

[0002] When a surgeon removes a surgical implant such as a hip stem or an artificial organ from the body, an implant extractor is used as an assisting instrument. A part of the implant, such as a trunnion, is grasped by such an instrument, and a force is applied to the instrument to remove the implant.

Summary of the Invention

Problems to be Solved by the Invention

[0003] Despite the existence of conventional implant extractors, there is still a need for an implant extractor that can easily remove and replace an implant fixture that may wear out when repeatedly used. Further, there is still a need for an implant extractor that can hold a movable jaw engaging the implant at a specified position even when no external force other than gravity is acting. Further, there is still a need for an implant extractor that is shorter than current implant extractors while maintaining the functions of the instrument.

Means for Solving the Problems

[0004] In an exemplary embodiment, there is provided an elongate housing having a proximal end configured to be connected to an extraction instrument, a distal end having an opening for operably engaging an implant, and an elongate recess, the elongate recess having a slot extending from the elongate recess to the opening, and an implant extractor is disclosed. A jaw is slidably received within the slot and extends to the opening in an operable state. A connector is mounted and received within the elongate recess of the housing. The connector is rotatably attached to the jaw, and movement of the connector causes the jaw to slide within the slot toward or away from the opening.

[0005] Other disclosed embodiments may include an insert having teeth for engaging an implant operably attached to the extraction instrument. The insert and the jaw may be removably attached to the implant extraction instrument and can be easily removed or replaced as needed. The jaw is removably attached within the elongated housing. Also, a locking mechanism may be provided to hold the extraction instrument in the locked position when gripping the implant.

[0006] The implant extractor includes an elongated housing, a jaw, and a linkage assembly. The elongated housing has a proximal end configured to connect to the extraction instrument, a distal end operably engageable with the implant, and an elongated recess extending within the housing. The jaw is slidably received within the elongated recess and extends to the distal end of the elongated housing. The linkage assembly is disposed within the elongated recess of the housing and includes a connector rotatably attached to the jaw such that movement of the linkage assembly causes the jaw to slide toward or away from the distal end.

[0007] The elongated housing has an opening at the distal end configured to receive the implant. The elongated recess is in fluid communication with the opening.

[0008] The linkage assembly includes a rod assembly, a proximal link, an intermediate link, and a bell link. The proximal link is operably connected to the rod assembly, and the proximal end of the rod assembly is rotatably connected to the distal end of the proximal link. The bell link is operably connected to the intermediate link and the jaw. When the handle is in the first position, the engagement between the jaw and the trunnion of the femoral stem implant is released, and when the handle is in the second position, the jaw engages the trunnion of the femoral stem implant.

[0009] The implant extractor further includes a handle that is rotatably connected to the housing and operably engaged with the proximal link. The implant extractor further includes a handle that is rotatably connected to the housing and operably engaged with the connecting assembly. When the handle is in the first position, Joe moves to a disengaged state, and when the handle is in the second position, Joe moves to an engaged state.

[0010] The rod assembly is a telescopic rod assembly. The rod assembly includes a proximal link connector, an intermediate link connector, and a rotating shaft. The proximal link connector is operably connected to the proximal link. The intermediate link connector is operably connected to the intermediate link. The rotating shaft is rotatable around the proximal link connector and is operably engaged with the intermediate link connector.

[0011] The implant extractor further includes a dial operably connected to the central rotating shaft. When the dial is rotated in the first direction, the intermediate link connector rotates in a loosening direction with respect to the central rotating shaft, and when the dial is rotated in the second direction opposite to the first direction, the intermediate link connector rotates in a tightening direction with respect to the central rotating shaft.

[0012] The implant extractor further includes a Joe link that couples the Berlin link to Joe. The implant extractor further includes a lock key that is operably connected to the proximal link and is movable between an unlocked position and a locked position. The lock key fixes the handle in a fixed position. The lock key fixes the proximal link in a fixed position.

[0013] Joe is removably attached within the elongated housing. The implant extractor further includes a removable insert removably attached within the housing at the distal end, and the removable insert has a surface for engaging the implant and an opening for receiving Joe.

[0014] The implant extractor further comprises a cam lock configured to fix the connection assembly in a fixed position. The implant extractor further comprises a cam lock configured to apply a locking force to fix the connection assembly in a fixed position.

[0015] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings that illustrate, by way of example, the principles of the present disclosure.

Brief Description of the Drawings

[0016] The foregoing summary and the following detailed description of exemplary embodiments of the present disclosure will be better understood when read in conjunction with the accompanying drawings. Exemplary embodiments are shown in the drawings for the purpose of illustrating the invention. However, it should be understood that the exemplary embodiments are not limited to the exact configurations and means shown.

[0017] The drawings are as follows.

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Mode for Carrying Out the Invention

[0018] Various exemplary embodiments of the present disclosure shown in the accompanying drawings will be described in detail. For the same or similar features, the same or similar reference numerals are used throughout the drawings as much as possible. Note that the drawings are in a simplified form and are not drawn to an exact scale. In the following description, specific terms are used for convenience, but are not used for limitation. Terms indicating directions such as up, down, left, right, upper side, lower side, diagonal, etc. are used with respect to the accompanying drawings. "Distal" shall mean away from the center of the body. "Proximal" shall mean close to the center of the body and / or away from the "distal" end. "Inward" and "outward" indicate the directions toward and away from the geometric center of a specific member and its designated portion, respectively. Such terms indicating directions used in conjunction with the following description of the drawings should not be construed as limiting the scope of the present application even if not explicitly described. Furthermore, the terms used in the present specification mean "at least one". These terms include the above-mentioned words and their derivatives, as well as words having similar meanings.

[0019] In the present specification, when "about" is described together with measurable values such as quantity and duration, it means that variations within an appropriate range, such as ±20%, ±10%, ±5%, ±1%, ±0.1%, etc., from the described numerical value are allowed.

[0020] In the present specification, "substantially" means to a considerable extent, not completely in agreement with what is described, but mostly, or with a difference acceptable in the relevant technical field. In the present specification, "exemplary" means to show as an example.

[0021] Throughout the present disclosure, its various aspects can be presented in a range format. It should be understood that the description in range format is merely for convenience and brevity and should not be construed as an immutable limitation on the scope of the subject matter of the present application. Thus, the description of a range should be considered to specifically disclose any possible sub-ranges and individual numerical values within that range. For example, a description of a range such as 1 to 6 should be considered to specifically disclose sub-ranges such as 1 to 3, 1 to 4, 1 to 5, 2 to 4, 2 to 6, 3 to 6, and also individual numerical values within that range such as 1, 2, 2.7, 3, 4, 5, 5.3, 6. This applies regardless of the width of the range.

[0022] Furthermore, the features, effects, and characteristics described in the exemplary embodiments of the present disclosure can be combined in any suitable manner in one or more embodiments. Those skilled in the relevant art will understand, in light of the description of this specification, that it is possible to practice without one or more of the specific features or effects of the exemplary embodiments of the present disclosure. Also, additional features and effects may be identified in specific embodiments that are not present in all exemplary embodiments of the present disclosure.

[0023] The present disclosure provides an implant extraction medical device for use in orthopedic surgery. The hip stem implant extractor 100 is an implant extractor according to an exemplary embodiment. FIGS. 1 to 28 show the configuration of an exemplary hip stem implant extractor 100 constructed in accordance with the present disclosure.

[0024] The hip stem implant extractor 100 includes a linkage assembly 280 (FIG. 12) operably mounted within an elongate housing 200. The linkage assembly 280 is connected to a jaw 118 movable between a first position and a second position by a cam lock 320 having a rotatable handle 106. As will be described in more detail later, the jaw is configured to grip, for example, a trunnion (not shown).

[0025] The elongated housing 200 has a proximal end 202 and an opposite distal end 204. The elongated housing comprises a proximal body 102 connected to the distal body 108. A continuous recess or an elongated continuous recess 206 extends in the proximal body and the distal body, and a connection assembly 280 is operably received therein.

[0026] The proximal body 102 comprises an instrument connector 104 for connecting an extraction instrument such as a T-handle or a C-frame. In this exemplary embodiment, the instrument connector is a threaded instrument connector.

[0027] The configuration of the distal body 108 is best shown in FIG. 1. The distal body 108 has a body portion and a bent arm portion. The bent arm portion extends from the body portion at an angle of about 40° to 50° with respect to the longitudinal axis of the body portion. The range of about 40° to 50° includes 35°, 45°, 55°. The bent arm portion has a through hole or an opening 220 for receiving an implant such as a trunnion of a femoral stem implant. The continuous recess 206 extends to the opening 220. An insert 124 may be removably attached to the opening. The insert 124 may be provided with a structure for improving the gripping force on its inner surface, such as teeth 122 or ridges. Further, an opening 125 (FIG. 8) for receiving the distal end of the jaw 118 is provided in the peripheral wall of the insert 124. When the insert is attached to the opening 220, the opening 125 is aligned with the continuous recess 206 and is in fluid communication with the continuous recess 206. The insert 124 is an insert that can be removably attached to the housing 200 at the distal end 204 and has a surface that engages with the implant and an opening 125 for receiving the jaw 118.

[0028] As best shown in FIGS. 10 and 12, the linkage assembly 280 includes a proximal link 112 having a cam race 216. The proximal link 112 is rotatably attached to a cam lock 320 that includes an elongated handle 106 and a cam 124. The cam 214 is operatively engaged with the cam race 216. As best shown in FIG. 10, the elongated handle 106 is operatively connected to the proximal link 112 at its proximal end. The distal end of the proximal link 112 opposite is rotatably attached to a proximal link connector 111. The end of the proximal link connector opposite engages a rotating shaft 115 that threads into an intermediate link connector 113.

[0029] The handle 106 is rotatably connected to the housing 200 and operatively engaged with the linkage assembly 280. The handle 106 is rotatably connected to the housing and operatively engaged with the rod assembly 110. When the handle 106 is in the first position, the jaw 118 moves to a disengaged state, and when in the second position, the jaw 118 moves to an engaged state.

[0030] The cam lock 320 is configured to fix the linkage assembly in a fixed position. The cam lock 320 is configured to apply a locking force to fix the linkage assembly 280 in a locked position.

[0031] As best shown in FIGS. 15 and 16, the linkage assembly 280 includes a rod assembly 110, a portion of which is disposed within the proximal body 102 and a portion within the distal body 108. The rod assembly is a telescopic rod assembly. The proximal end of the telescopic rod assembly 110 includes a proximal link connector 111 that is rotatably connected to the distal end of the proximal link 112. The distal end of the telescopic rod assembly 110 includes an intermediate link connector 113 that is rotatably connected to the proximal end of the intermediate link 114. The intermediate link connector 113 includes a threaded shaft that extends in the proximal direction and engages the telescopic rod assembly 110. The telescopic rod assembly 110 includes a central rotating shaft 115 configured to rotate about the proximal link connector 111 and engage the intermediate link connector 113.

[0032] The linkage assembly 280 includes a rod assembly 110, a proximal link 112, an intermediate link 114, and a bell link 116. The proximal link 112 is operably connected to the rod assembly 110. The proximal end of the rod assembly 110 is rotatably connected to the distal end of the proximal link 112. The intermediate link 114 is operably connected to the rod assembly 110. The bell link 116 is operably connected to the intermediate link 114 and the jaw 118. The rod assembly 110 includes a proximal link connector 111, an intermediate link connector 113, and a rotating shaft 115. The proximal link connector 111 is operably connected to the proximal link 112. The intermediate link connector 113 is operably connected to the intermediate link 114. The rotating shaft 115 rotates about the proximal link connector 111 and is operably engaged with the intermediate link connector 113.

[0033] The manual drive dial 132 is operably engaged with the rotary shaft 115, adjusts the position of the intermediate link connector 113, and enables stepless positioning of the intermediate link connector 113 along the screwing path in the direction indicated by arrow A (Fig. 16). As shown in Fig. 8, the rotary shaft 115 has a plurality of flat side surfaces and is operably engaged with corresponding flat side surfaces around the inner surface of the dial 132. For example, the plurality of flat portions around the rotary shaft can be hexagonal, and the corresponding flat side surfaces of the dial can also be hexagonal accordingly.

[0034] The opposite end of the link connector 113 is rotatably attached to one end of the elongated intermediate link 114. The opposite or distal end of the intermediate link 114 is rotatably attached to the bell link 116. The jaw 118 is rotatably attached to the opposite or distal end of the bell link 116 together with the jaw link 120 by a rotation axis 300 (Figs. 9, 10, and 12) and extends operably through the insert 124. The bell link 116 is configured, for example, as shown in Fig. 11 and has a triangular shape with three rotation axes. The three rotation axes are a proximal rotation axis, a distal rotation axis, and a lateral rotation axis. The proximal rotation axis is rotatably engaged with the intermediate link, the distal rotation axis is rotatably engaged with the jaw, and the lateral rotation axis is rotatably engaged with the distal body. In order to operably engage with an implant, such as the trunnion of a femoral stem implant, the jaw 118 may be provided with teeth 126, ridges, etc. (similar to the insert 124) to enhance the gripping force.

[0035] As best shown in FIGS. 1 and 10, the linkage assembly 280 of FIG. 12 is operably attached to the proximal body 102 about a pivot axis 210 with the handle, and the bell link 116 is operably attached to the distal body about a pivot axis 212, and is operably attached within the continuous recess 206 of the housing 200. The jaw 118 extends into the continuous recess 206 and is slidable within the continuous recess 206 toward the distal end 204. The dial 132 is accessible from the opening of the proximal body 102, and the user can set the position of the jaw 118 within the opening 220 by rotating the dial 132 in either direction about the rotation shaft, and can finely adjust the force applied to the jaw via the cam lock. That is, by rotating the dial 132, the intermediate link connector 113 moves in either direction along the continuous recess 206, in other words, proximally or distally along the housing, whereby the intermediate link 114 moves and the bell link 116 rotates about the pivot axis 212, and the jaw 118 moves along the slot 260 (FIG. 8) of the distal body where the jaw 118 is disposed.

[0036] The dial 132 is operably connected to the central rotation shaft 115. By turning the dial 132 in the first direction, the intermediate link connector 113 rotates in a loosening direction with respect to the central rotation shaft 115, and by turning the dial 132 in the second direction opposite to the first direction, the intermediate link connector 113 rotates in a tightening direction with respect to the central rotation shaft 115.

[0037] By moving the handle from the open position 170 (FIGS. 17 and 19) to the closed position 172 (FIGS. 18 and 20), an additional clamping force (an additional force relative to the force applied via the dial) can be applied to the jaw 118 and further to the implant (e.g., trunnion) within the opening. Thereby, the handle 106 rotates about the pivot axis 210, operably engaging the cam 214 with the cam race 216 of the proximal link 112, moving the rotation shaft 115 toward the distal end 204, and the linkage assembly 280 can move the jaw 118 toward the opening 220.

[0038] More specifically, when the handle 106 is in the unlocked or fully open position 170 (Figs. 17 and 19), the first surface 128 of the proximal end of the handle 106 abuts against the distal surface 130 of the proximal body 102, and the cam 214 at the proximal end of the handle abuts against the cam race 216 facing the distal side of the proximal link 112. If the handle is released, the user can adjust the length of the connecting assembly 280 to an appropriate length in order to receive the implant to be grasped at the opening, to increase or decrease the preload, or to increase or decrease the initial position (i.e., the designated position) of the jaw 118 within the housing or on the implant to be grasped. To do so, the user rotates a dial 132 having an opening 134 corresponding to the circumferential shape of the central rotating shaft 115, rotating the central rotating shaft in the same direction as the dial. By rotating the central rotating shaft in the first direction, the intermediate link connector 113 rotates in a loosening direction with respect to the female-threaded distal end of the central rotating shaft. At the same time, the proximal cylindrical socket end of the central rotating shaft freely rotates around the distal end of the proximal link connector 111. Similarly, by rotating the central rotating shaft in the second direction, the intermediate link connector 113 rotates in a tightening direction with respect to the central rotating shaft 115.

[0039] Rotation of the central rotary shaft in the first direction causes the intermediate link 114, bell link 116, jaw link 120, and jaw 118 to move distally, increasing the preload applied to the target implant within the opening 220. Alternatively, the position of the jaw within the continuous recess 206 of the housing can be adjusted. Conversely, rotation of the central rotary shaft in a second direction opposite to the first direction causes the intermediate link connector 113 to rotate in a tightening direction with respect to the female-threaded distal end of the central rotary shaft. At the same time, the proximal cylindrical socket end of the central rotary shaft rotates freely around the distal end of the proximal link connector 111. The jaw link 120 connects or couples the jaw to the bell link. In other words, rotation of the central rotary shaft in the second direction causes the intermediate link 114, bell link 116, jaw link 120, and jaw 118 to move proximally, decreasing the preload applied to the target implant within the opening 220 or adjusting the position of the jaw within the continuous recess 206.

[0040] When the connection assembly 280 is properly adjusted to receive the target implant to be removed and the preload applied to the target implant is adjusted, the handle 106 moves from the unlocked position 170 (Figs. 17 and 19) to the locked position 172 (Figs. 18 and 20). Thereby, the handle 106 moves the proximal link 112 in the direction of the telescopic rod assembly 110, moving the intermediate link 114, bell link 116, jaw link 120, and jaw distally to grip the target implant within the opening 220 using the aforementioned engagement ridges and teeth 122, 126.

[0041] At the same time, as best shown in FIG. 20, the second surface 141 of the proximal end of the handle 106 abuts against the distal surface 130 of the proximal body 102. As a result, the proximal link 112 is tilted slightly excessively (FIG. 20), the handle is fixed in the locked position, the downstream link is held in the locked position, and the jaw 118 is held in a position where it grips around the trunnion. The proximal cylindrical socket end of the central rotating shaft 115 preferably includes a compressible bushing 142 (FIG. 16). The compressible bushing 142 can be manufactured from an elastic polymer such as polyetherimide or other elastic polymers that are generally rigid and are intended to be used as an elastic polymer or a synthetic compression member.

[0042] According to one aspect, as best shown in FIGS. 1, 18 and 21, the hip stem implant extractor 100 is connected to the proximal link 112 by a fastener 146 and is between an unlock position 170 (FIG. 17) and a lock position 172 (FIG. 18) that is about 90° with respect to the unlock position. It further includes a lock key 140 that can rotate around the fastener 146 in the direction of arrow B (FIG. 21). As shown in FIGS. 19 and 20, the proximal link 112 may include two sockets 150. A spring 148 is disposed in the two sockets 150, and its upper end biases and supports a ball bearing 152. The spring-type ball bearing is engaged with a pair of detents 151 so that the lock key does not rotate due to the impact during extraction. It can be intuitively understood that the lock key 140 is surely in the locked position or the unlocked position by the engaged ball bearing and detent. When the lock key is in the unlocked position, the handle 106 can be freely moved between the unlocked position and the locked position. When the lock key is in the locked position, the handle 106 is fixed in its locked position, and the jaw 118 is fixed in a state of being engaged with a grip engagement position, for example, engaged with the trunnion of the hip stem implant, and an extraction force such as an impact may be applied to the extraction instrument attached to the threaded connector 104 of the proximal body 102.

[0043] The lock key 140 is operably connected to the proximal link 112 and is movable between an unlocked position and a locked position. The lock key 140 fixes the proximal link 112 in a fixed position.

[0044] Although the orientations and assemblies of the various members of the hip stem implant extractor 100 have been described, its features will be described. For example, the various links constituting the connecting assembly 280 can provide an optimal gripping force by the jaws while minimizing the total length of the housing 100 in the longitudinal direction. Thereby, the hip stem implant extractor 100 can be made shorter, such as a hip stem implant extractor shorter than a conventional hip stem implant extractor.

[0045] Furthermore, even when a force exceeding gravity does not act on the jaws, the connecting assembly holds the jaws rotatably, so that the jaws are held at a specified position. On the other hand, the gravity acting on a conventional slide trunnion engagement structure may slide the engagement structure to an unexpected position when the force by the command of the device is removed or when the device is in an unlocked state. Also, since the inserts of the sliding jaws and the connecting assembly are removably attached to the housing, when these are worn, they can be easily removed and replaced as needed without replacing expensive peripheral parts.

[0046] That is, the hip stem implant extractor 100 generates a first engagement force or a fine engagement force by the connecting assembly to position the jaws at a specified position. Also, the hip stem extractor generates a second engagement force or a locking force by the cam lock to securely engage the jaws with the implant to be extracted.

[0047] The structure of an implant extractor according to another aspect of the present disclosure is shown in FIGS. 22 to 28. The shading of the surface depicted with relatively light dashed lines indicates the contour, not the surface decoration. Throughout the drawings, the lines indicating the shading of the surface indicate the contour of the surgical instrument. Among the parts of the structure of the implant extractor, those indicated by the dashed lines are not considered to form part of the structure.

[0048] Although the present disclosure has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes can be made without departing from the scope of the present disclosure, and its elements can be replaced with equivalents. Furthermore, without departing from the essential scope, modifications may be made to adapt to the teachings of the exemplary embodiments by changing to a specific situation or material. It should be understood that the exemplary embodiments are not limited to the specific aspects disclosed, but are intended to cover modifications within the spirit and scope of the disclosure of the subject matter defined by the appended claims.

Claims

1. An implant extractor (100) for operably gripping a surgical implant, the implant extractor (100) comprising a housing (200) and a jaw (118), the housing having a proximal end (202) configured to connect to an extraction instrument and a distal end (204) operably engageable with the implant, the jaw being slidably received within the housing and extending to the distal end (204) of the housing, an elongate recess (206) within the housing, and a connection assembly (280) within the elongate recess (206) of the housing (200), the connection assembly (280) being rotatably attached to the jaw and comprising connectors (110, 114, 116, 120) such that movement of the connection assembly (280) causes the jaw to slide towards or away from the distal end (204). An implant extractor (100).

2. The implant extractor (100) according to claim 1, wherein the housing (200) has an opening (220) at the distal end configured to receive the implant.

3. The implant extractor (100) according to claim 2, wherein the elongate recess (206) is connected to the opening (220).

4. The implant extractor (100) according to claim 1, further comprising a handle (106) rotatably connected to the housing (200) and operably engaged with the connection assembly (280).

5. The implant extractor (100) according to claim 1, wherein the jaw (118) is removably attached to the housing (200).

6. The implant extractor (100) according to claim 1, further comprising a removable insert (124) removably attached to the housing (200) at the distal end, the removable insert (124) having a surface for engaging the implant and an opening (125) for receiving the jaw.

7. The implant extractor (100) according to claim 1, further comprising a cam lock (320) configured to fix the connection assembly in a fixed position.

8. The implant extractor (100) according to claim 1, further comprising a cam lock (320) configured to apply a locking force to the connection assembly and fix the connection assembly in a fixed position.

9. The connection assembly (280) comprises a rod assembly (110), a proximal link (112) operably connected to the rod assembly (110), a proximal end of the rod assembly (110) rotatably connected to a distal end of the proximal link (112), an intermediate link (114) operably connected to the rod assembly (110), and a bell link (116) operably connected to the intermediate link (114) and the jaw (118). The implant extractor (100) according to any one of claims 1 to 8.

10. The implant extractor (100) according to claim 9, further comprising a handle (106) rotatably connected to the housing (200) and operably engaging the rod assembly (110).

11. When the handle (106) is in a first position, the jaw (118) moves to a disengaged state, and when in a second position, the jaw (118) moves to an engaged state. The implant extractor (100) according to claim 10.

12. The rod assembly (110) is a telescopic rod assembly. The implant extractor (100) according to claim 9.

13. The rod assembly (110) comprises a proximal link connector (111) operably connected to the proximal link (112), an intermediate link connector (113) operably connected to the intermediate link (114), and a rotating shaft (115) that rotates around the proximal link connector (111) and operably engages the intermediate link connector (113). The implant extractor (100) according to claim 9.

14. The implant extractor (100) according to claim 13, further comprising a dial (132) operably connected to the rotating shaft (115). When the dial (132) is rotated in a first direction, the intermediate link connector (113) rotates in a loosening direction with respect to the rotating shaft (115), and when the dial (132) is rotated in a second direction opposite to the first direction, the intermediate link connector (113) rotates in a tightening direction with respect to the rotating shaft (115).

15. The implant extractor (100) according to claim 9, further comprising a joe link that connects the Berlin link (116) to the joe (118).

16. The implant extractor (100) according to claim 9, further comprising a lock key (140) operably connected to the proximal link (112) and movable between an unlocked position and a locked position.

17. The implant extractor (100) according to claim 16, wherein the lock key (140) fixes the position of the proximal link (112) to a fixed position.

18. The connection assembly (280) is a rod assembly (110) at least partially disposed within the housing (200), an intermediate link (114) connected to the end of the rod assembly (110) on the distal end side of the housing (200) among both ends of the rod assembly (110), and a Berlin link (116) connected to the intermediate link (114) and the joe (118). The implant extractor (100) according to any one of claims 1 to 8.

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