Implant extraction system

Abstract

The present invention discloses a surgical device (2) for extracting a prosthetic component from a patient during a surgical procedure. The surgical device includes a first component (8) having a concave coupling portion at a first end and a second end configured to be connected to one of a prosthetic component or a surgical extraction instrument. The first component also includes a retainer. The surgical device also includes a second component (10) having a first end defining a convex coupling portion, a handle (30, 130) extending from the convex coupling portion, and a second end configured to be connected to the other of the prosthetic component or the surgical extraction instrument. The convex coupling portion of the second component is configured to be disposed within the concave coupling portion of the first component and retained within the concave coupling portion by the retainer, wherein the handle of the second component extends away from the concave coupling portion of the first component. The convex coupling portion of the second component and the retainer of the first component are configured so that the convex coupling portion is retained in the concave coupling portion while allowing the first component to articulate relative to the second component. The first and second components form an articulation joint allowing a user to: connect a surgical extraction instrument to a prosthetic component within a patient, articulate a portion of the surgical extraction instrument residing outside of the surgical site, and transmit an extraction force to enable removal of the prosthetic component from the patient.

Description

Technical Field

[0001] The present disclosure relates to an apparatus for extracting a prosthetic component from a patient during a surgical procedure. A particular configuration relates to a femoral stem prosthesis extractor component for removing a femoral stem of a prosthetic hip joint from a patient's femur during a surgical procedure. A system of apparatus components for extracting a prosthesis from a patient during a surgical procedure is also described. In addition, the present disclosure also describes methods of extracting a prosthetic component such as a femoral stem prosthesis from a patient during a surgical procedure and methods of implanting the prosthetic component. Background Art

[0002] Prosthetic implants such as prosthetic hip joints are well known in the art. Typically, at least one component of the prosthetic implant is anchored in a patient's bone. For example, with respect to a prosthetic hip joint, a femoral stem component is inserted and anchored in the patient's femur. A neck portion extends from the femoral stem, and a femoral head is mounted on the femoral stem. The femoral head is configured to be coupled to an acetabular cup component to form a prosthetic hip joint.

[0003] During surgery, the patient's femur is prepared for receiving the femoral stem component of the prosthetic hip joint. The femoral stem must be correctly positioned to align with the acetabular cup component. Both angular orientation and length are important. Therefore, the surgeon may need to insert the femoral stem component into the patient's femur after the initial preparation of the femoral canal, then extract the femoral stem to perform additional femoral canal preparation, and then reinsert the femoral stem. This procedure may need to be repeated until a satisfactory positioning of the femoral stem is achieved.

[0004] During such intraoperative femoral stem removal, instruments are often required to retrieve the stem due to the active fixation of the stem within the femur. Extraction instruments need to be connected to the femoral stem to pull the stem from the femur. However, using such instruments to remove the stem can cause damage to the stem, which is undesirable, especially when the rod is reinserted after additional femoral canal preparation. The procedures for femoral stem removal are particularly challenging in anterior surgical procedures where access to the stem is limited. Problems such as cross-threading, general damage or failure of the instrument may result. In addition to intraoperative primary surgery, such problems may also occur when removing the femoral stem during revision surgery. Similar problems may also occur when extracting other types of prosthetic components. In addition, in addition to the damage caused to the prosthetic components during such extraction procedures, excessive damage to the bone and surrounding tissue should also be avoided.

[0005] The object of the present disclosure is to solve the aforementioned problems. Summary of the invention

[0006] According to one aspect of the present disclosure as described herein, there is provided a surgical device for extracting a prosthetic component from a patient during a surgical procedure, the surgical device comprising:

[0007] a first component having a female coupling portion at a first end and a second end configured to connect to one of a prosthetic component or a surgical extraction instrument, the first component further comprising a retainer; and

[0008] a second component having a first end defining a male coupling portion, a stem extending from the male coupling portion, and a second end configured to be connected to the other of the prosthetic component or the surgical extraction instrument,

[0009] wherein the male coupling portion of the second component is configured to be disposed within the female coupling portion of the first component and retained within the female coupling portion by the retainer, and the stem of the second component extends away from the female coupling portion of the first component, the male coupling portion of the second component and the retainer of the first component being configured such that the male coupling portion is retained in the female coupling portion while allowing articulation of the first component relative to the second component,

[0010] The first component and the second component form an articulated joint, thereby allowing a user to: connect the surgical extraction instrument to the prosthetic component within the patient's body, articulate a portion of the surgical extraction instrument that resides outside the surgical site, and transmit an extraction force to enable removal of the prosthetic component from the patient.

[0011] In some examples, at least one of the first component and the second component further includes a driver component for driving the component to attach to the prosthetic component.

[0012] In some examples, the device includes a ball joint. For example, a surgical device for extracting a prosthetic component from a patient during a surgical procedure may be provided, wherein the female coupling portion of the surgical device may be a socket and the male coupling portion may be a ball portion, the ball portion being configured to be disposed within the socket, the socket having a closed end and an open end, and the retainer of the first component is a neck portion disposed between the closed end and the open end of the socket and defining an interior width that is narrower than a width of the closed end of the socket, wherein the ball portion is configured to be disposed within the socket, wherein the stem of the second component extends through the neck portion and out through the open end of the socket, the width of the ball portion being greater than a width of the neck portion such that the ball portion is retained in the closed end of the socket and prevented from passing through the neck portion and the open end of the socket while allowing the ball portion and the socket to articulate relative to each other, the ball portion and the socket thus forming a ball joint. The ball and socket joint allows a user to: connect the surgical extraction instrument to the prosthetic component within a patient, articulate a portion of the surgical extraction instrument that resides outside of a surgical site, and transmit an extraction force to enable removal of the prosthetic component from the patient.

[0013] The foregoing configuration enables the surgical extraction instrument (e.g., a sliding hammer) to articulate relative to the prosthetic component while also transmitting an extraction force to enable removal of the prosthetic component from the patient. The articulation functionality enables use in all approaches and incision sizes. Furthermore, by allowing articulation and extraction force transmission, problems such as cross-threading, general damage or malfunction of the instrument are mitigated. Furthermore, in addition to mitigating damage to the prosthetic component during such an extraction procedure, excessive damage to the bone and surrounding tissue is also mitigated.

[0014] One of the socket and the ball portion may be permanently attached to the extraction instrument or alternatively may be removably attachable to the extraction instrument.

[0015] The embodiments described in the detailed description are removably attached to the extraction instrument. However, it is also envisaged that the ball and socket arrangement may be permanently integrated at the end of the extraction instrument.

[0016] The socket can be configured to attach to the surgical extraction instrument, and the ball portion can be configured to attach to the prosthetic component. An embodiment having this configuration is described in the detailed description. However, it is also contemplated that in principle the order of the components can be reversed, such that the ball portion is configured to attach to the surgical extraction instrument and the socket is configured to attach to the prosthetic component.

[0017] The socket may include an opening in a side wall of the socket having a shape complementary to that of the ball portion to enable the ball portion to be coupled to and uncoupled from the socket. Advantageously, the opening in the side wall of the socket is positioned such that the ball portion cannot slide laterally out of the opening in the side wall when an extraction force is applied in use to enable removal of the prosthetic component from the patient. That is, after coupling the ball portion to the socket by moving the ball portion laterally through the opening in the side wall of the socket, the socket may slide axially over the ball portion to a position where the ball portion cannot move laterally out of the opening in the side wall of the socket.

[0018] The driver component may include a drive connector disposed on the second component between the handle and the second end, the drive connector defining a surface for grasping and rotating the second component to attach and release the second component to the prosthetic component.

[0019] The first component may also include a drive connector disposed on an interior surface of the side wall and between the neck portion and the open end of the first component, the drive connector of the first component having a surface complementary to the drive connector on the second component. The socket may be configured to slide on the second component to engage the drive connector so as to enable the second component to be driven to connect the second component to the prosthetic component in an attached configuration, and when an extraction force is transmitted to enable the prosthetic component to be removed from the patient, the first component is configured to slide back on the second component in an opposite direction to disengage the drive connector in an extraction configuration. The drive connectors on the first component and the second component may include complementary key teeth. By disengaging the drive connectors in the extraction configuration, this prevents damage to the drive component (e.g., key teeth) when the extraction force is transmitted during the prosthetic extraction procedure.

[0020] As an alternative to using a key tooth component to drive the ball joint to the prosthesis, the drive connector on the second component may alternatively be a hexagonal connector. In addition, the drive connector on the second component may be driven by a complementary connector in the first component, or alternatively may be driven by a separate tool such as a hexagonal drive tool. In addition, in addition to or in lieu of the drive connector located between the handle and the end of the second component, the ball portion may also include a drive component for driving the second component to be attached to the prosthesis component. For example, the ball portion may include a hexagonal drive. In some examples, both the drive connector on the ball portion of the second component and the drive connector on the handle are provided so that if one of the drive connectors fails, such as due to excessive rounding during use, the other drive connector in the drive connector can be used to attach the second component to the prosthesis or remove the second component from the prosthesis.

[0021] The end connector on the second end of the second component may include a threaded connector for attaching the second component to a complementary threaded connector in the prosthetic component. To limit the possibility of cross-threading during attachment, the second end of the second component may include a non-threaded pilot portion to provide good alignment of the components prior to threaded engagement.

[0022] Other configurations for coupling an articulation joint component to a prosthesis and actuating the articulation joint component to be attached to a prosthesis are also contemplated. For example, the ball portion may include a cavity and the socket may include a complementary protrusion, wherein the socket is configured to slide on the second component to engage the protrusion with the cavity so as to enable the components to be actuated to connect the articulation joint component to the prosthetic component in an attachment configuration, and when an extraction force is transmitted to enable the prosthetic component to be removed from the patient, the first component is configured to slide back on the second component in an opposite direction to disengage the protrusion and the cavity in an extraction configuration. In one configuration, the protrusion is in the form of a rod and the cavity is in the form of a groove in the ball portion.

[0023] Still alternatively, the female coupling portion of the first component may be in the form of a socket defined by two arms extending from the second end of the first component and having an open end, and the male coupling portion of the second component may be in the form of a ring. In this configuration, the ring can be disposed within the socket such that the stem of the second component extends from the ring and out through the open end of the socket. The retainer of the first component is in the form of a rod configured to extend through the ring of the second component to couple the first and second components together while allowing the first component to articulate relative to the second component.

[0024] Another possibility is a universal joint arrangement. In this arrangement, the male coupling portion of the second component is in the form of a rotatable member mounted on a first rod so that it can rotate about a first axis, the rotatable member is arranged in the female coupling portion of the first component, and the holder of the first component is in the form of a second rod oriented so that the rotatable member can rotate about a second axis perpendicular to the first axis, the first component and the second component thus forming a universal joint.

[0025] According to another aspect of the present disclosure as described herein, there is provided a surgical system comprising:

[0026] A surgical device as previously defined; and

[0027] A surgical extraction instrument (eg, a sliding hammer) is configured to be coupled to one of the first (eg, socket) component or the second (eg, ball) component.

[0028] The system may also include a prosthetic component configured to couple to the other of the first (e.g., socket) component and the second (e.g., ball) component. For example, this may be in the form of a femoral stem having a suitable connector at the end of the femoral stem for coupling to the articulation joint component and the surgical extraction instrument.

[0029] Also described herein is a method of extracting a prosthetic component from a patient during a surgical procedure using a surgical system as defined above, the method comprising:

[0030] coupling the surgical device, the surgical extraction instrument, and the prosthetic component together; and

[0031] The prosthetic component is extracted by applying an extraction force to the surgical extraction instrument.

[0032] In another example of the above method, the first component and the second component may be pre-assembled prior to being attached to the extraction instrument.

[0033] In another example, prior to extracting the prosthetic component, one of the first component and the second component may be attached to the prosthesis in the patient, and the other of the first component or the second component may then be coupled to the one of the first component or the second component that is attached to the prosthesis.

[0034] According to another aspect of the present disclosure as described herein, there is provided a surgical system comprising:

[0035] A surgical device as previously defined; and

[0036] A surgical implant instrument configured to be coupled to one of the first (e.g., socket) component or the second (e.g., ball) component. For example, this may be in the form of a femoral stem having a suitable connector at the end of the femoral stem for coupling to the articulation joint component and the surgical implant instrument.

[0037] Also described herein is a method of implanting a prosthetic component into a patient during a surgical procedure using a surgical system as defined above, the method comprising:

[0038] coupling the surgical device, the surgical implant instrument, and the prosthetic component together; and

[0039] The prosthetic component is implanted by applying an implantation force to the surgical implantation instrument.

[0040] In another example of the above method, the first component and the second component can be pre-assembled prior to being attached to the implant device.

[0041] In another example, the prosthetic component may be provided with one of the first joint component and the second joint component already attached. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Embodiments of the present disclosure will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0043] Figure 1 A device for extracting a prosthetic component from a patient is shown, the device being connected to a slide hammer and connectable to a prosthetic component (not shown) for performing the prosthetic extraction;

[0044] Figure 2 Shows Figure 1Another view of the device of FIG. 1 during connection to a prosthetic component, with arrows indicating a push direction for engaging the device to drive the device to attach to the prosthetic component (attachment configuration);

[0045] Figure 3 Shows Figure 1 and Figure 2 Another view of the device after being connected to the prosthetic component, with the arrow indicating the pulling direction for extracting the prosthetic component (extraction configuration);

[0046] Figure 4 showing a cross-sectional view of the device in its extraction configuration, wherein the ball portion of the second component engages the neck portion of the first component to couple the two components together during a pulling action to extract the prosthetic component;

[0047] Figure 5 Shows Figure 4 a close-up of a second component showing the ball portion of the second component engaging the neck portion of the socket of the first component to couple the two components together during a distraction maneuver to facilitate extraction of the prosthetic component while also enabling relative articulation of the components;

[0048] Figure 6 Shows Figures 1 to 5 a side view of the device separated from the prosthetic component and the extraction instrument, the component being in a neutral configuration between the attached configuration and the extraction configuration, wherein the second component can be disengaged from the first component via the sidewall cutout or opening;

[0049] Figure 7 Another device for extracting a prosthetic component from a patient is shown, which is similar in construction and function to Figures 1 to 6 The device shown, but with a different coupling structure for attaching the drive member to the prosthesis;

[0050] Figure 8 Shows Figure 7 Another view of the device of showing a different coupling structure in the form of a primary hexagonal driver located in the ball portion of the second component and a secondary hexagonal driver located on the shank of the second component for use in the event of failure of the primary hexagonal driver;

[0051] Fig. 9 Shows Figure 7 and Figure 8 A cross-sectional view of a device;

[0052] Fig.10 Shows Fig. 9 a close-up of a second component showing the ball portion of the second component engaging the neck portion of the socket of the first component to couple the two components together during a distraction maneuver to facilitate extraction of the prosthetic component while also enabling relative articulation of the components;

[0053] Fig.11 Another device for extracting a prosthetic component from a patient is shown, which is similar in construction and function to Figures 1 to 10 The device shown, but with a different coupling structure for attaching the drive component to the prosthesis, and the order of the components is reversed so that the first component is attached to the prosthesis and the second component is attachable to the extraction instrument;

[0054] Fig.12 Shows Fig.11 Another view of the device of , showing a coupling structure for driven attachment in the form of a groove in the ball portion of the second component and a complementary rod in the socket of the first component;

[0055] Fig.13 Shows Fig.11 and Fig.12 Another view of the device;

[0056] Fig.14 Another apparatus for extracting a prosthetic component from a patient is shown, the apparatus having a Figures 11 to 13 A device similar to a groove and rod coupling, but the order of the components is reversed so that the second component is attached to the prosthesis and the first component is attachable to the extraction instrument;

[0057] Fig.15 Shows Fig.14 Another view of the device;

[0058] Fig.16 Another apparatus for extracting a prosthetic component from a patient is shown, the apparatus being configured to enable a first component to articulate at a large angle relative to a second component;

[0059] Fig.17 Another device for extracting a prosthetic component from a patient is shown, which is similar in construction and function to Figures 1 to 6 The device shown allows the socket of the first component to be pushed downwardly on the ball portion of the second component to engage the drive mechanism for attaching the second component to the prosthesis;

[0060] Fig.18 Another device for extracting a prosthetic component from a patient is shown, the device having a different coupling structure in the form of a ring and rod configuration;

[0061] Fig.19 Shows Fig.18 a cross-sectional view of the device; and

[0062] Fig. 20 Another device for extracting a prosthetic component from a patient is shown, the device having a different coupling structure in the form of a universal joint configuration. DETAILED DESCRIPTION

[0063] The device as described herein can be used to remove the femoral stem during primary surgery and can also be used for revision surgery. The configuration as described herein allows the device to be used for all approaches and incision sizes by allowing the user to articulate a portion of the extractor that resides outside the surgical site (which is also the area that allows the extraction force to be transmitted to achieve removal).

[0064] Figure 1 A device 2 for extracting a prosthetic component from a patient is shown, which is connected to a sliding hammer 4 and can be connected to a prosthetic component (not shown) for performing the prosthetic extraction. The device is mainly a ball joint to allow what is usually a long axis to pivot to avoid hitting the tissue. The second part is attached to the femoral implant, for example by means of a thread, but in principle it can be attached in many ways depending on the method and variants. The first part has a socket that can be separated from the ball by means of a cutout or opening. The first part is permanently combined with or removably connected to a force transmission part of the device system. The force transmission device can be, for example, Figure 1 A sliding hammer or slap hammer is shown to provide more controlled extraction force than hammering, but a hammer plate may also be used. The first component may be attached to the second component by aligning the socket opening concentrically with the ball portion, and then the socket may be rotated on the same axis as the screw, which captures the ball ready for attachment or extraction.

[0065] Figure 2 Another view of the device 2 in the process of being connected to the prosthetic component 6 is shown. The arrow indicates the pushing direction for engaging the device to drive the device 2 to be attached to the prosthetic component 6. The device 2 includes a first component 8 and a second component 10. The second component 10 includes a ball portion, a handle, a key tooth portion, and a connector screw or thread for connecting to the prosthetic component 6. When pushed in the direction of the arrow, the first component 8 slides on the second component 10 to engage the key teeth of the second component 10. In this regard, the first component 8 includes complementary key teeth on its inner surface, which are pushed into place. Figure 2 The configuration shown is engaged with the key teeth of the second component 10. The device can then be rotated via a sliding hammer or other surgical instrument to screw the device onto the femoral stem component 6. That is, once the key teeth are engaged, the entire device will allow the user to tighten / loosen the screw into the handle.

[0066] exist Figure 2 , the opening 12 in the first component 8 is also marked. In this "attachment configuration", during the attachment procedure, the ball portion is positioned toward the upper closed end of the socket, rather than adjacent to the opening to prevent the second component 10 from separating from the first component 8.

[0067] Figure 3 Shows Figure 1 and Figure 2 Another view of the device 2 after being connected to the prosthetic component 6. The arrow indicates the pulling direction for extracting the prosthetic component 6. When pulled in this manner, the key teeth on the inner surface of the first component 8 are disengaged from the key teeth on the second component 10. The first component 8 has an inner neck that engages with the ball portion of the second component 10, thereby coupling the first component 8 and the second component 10. Therefore, all of the prosthetic component 6, the second component 10 and the first component 8 are coupled together and all along the same direction as shown. Figure 3 That is, once the thread of the second component is locked into the femoral stem 6, the first component 8 can be pulled away axially, so that Figure 3 The extraction position shown disengages the key teeth and engages the underside of the ball portion. Additionally, with the ball and socket engaged, the device 2 allows the entire device system (excluding the threads of the second component attached to the femoral stem 6) to freely articulate and rotate to miss soft tissue and then begin the stem extraction process using, for example, a slap hammer weight.

[0068] exist Figure 3 , the opening 12 in the first component 8 is also marked. In this "extraction configuration", during the extraction procedure, the ball portion is positioned toward the lower open end of the socket of the first component 8, which abuts the inner neck of the first component 8 but not adjacent to the opening so as to prevent the second component 10 from detaching from the first component 8 through the opening 12.

[0069] Figure 4 A cross-sectional view of the device 2 is shown in its extraction configuration, wherein the ball portion 14 of the second component 10 engages with the neck portion 16 of the first component 8 to couple the two components together during a pulling action for extraction of the prosthetic component. The first component includes a spherical portion 14 for attaching the first component 8 to an extraction instrument such as Figure 1 The first component also has a socket 20 configured to receive the ball portion 14 when the first component 8 and the second component 10 are coupled together. The neck portion 16 of the first component is located between the closed end and the open end 22 of the socket of the first component 8. On the inner wall at the open end 22 of the first component 8, key teeth as previously described are provided. These key teeth can be pushed into engagement with the key teeth 24 on the second component, as shown. Figure 2 The configuration shown is shown.

[0070] Figure 4 Also marked is a threaded connector (e.g., a screw or bolt) 26 of the second component, which is screwed into a complementary connector in the prosthetic component to be extracted. In the arrangement shown, the threaded connector 26 has an unthreaded extended guide portion 28. This helps prevent cross-threading during coupling of the device to the prosthetic component prior to extraction.

[0071] Figure 5 Shows Figure 4 , which shows the ball portion 14 of the second component 10 engaging the neck portion 16 of the first component 8 to couple the two components together during a distraction action for extraction of the prosthetic component, while also allowing the components to undergo relative articulation. The stem 30 of the second component 10 is also labeled. The width of the stem 30 is somewhat narrower when compared to the width of the neck portion 16 in the first component to ensure that the components can freely articulate and are not locked together in a fixed angle configuration during the extraction procedure.

[0072] Figure 6 Shows Figures 1 to 5 8. A side view of the device 2 separated from the prosthetic components and the extraction instrument. The device 2 is shown in a neutral configuration intermediate the attached configuration and the extraction configuration of the previous figures. In this neutral position, the second component 10 can be moved laterally through the opening 12 in the side wall of the first component 8 to engage and disengage the second component 10 from the first component 8. Therefore, the opening 12 should have a shape that is complementary to the shape of the ball portion 14 and the handle 30 of the second component 10 so as to allow the ball portion 14 and the handle 30 to pass through the opening 12 when moved laterally in this neutral position.

[0073] Figure 6 The key teeth portion 24 and the screw portion 26 of the second component 10 are also marked. However, it should be noted that other variations are envisioned. For example, other forms of connectors may be used instead of Figure 6 Key teeth 24 and screw 26 are shown.

[0074] Figure 7 Another device 102 for extracting a prosthetic component from a patient is shown. The device 102 is similar in construction and function to the Figures 1 to 6 The device 2 shown in FIG. 1 is similar to the device 2 shown in FIG. 1 , but has a different coupling structure for attaching the drive device to the prosthetic component. The device 102 includes a first component 108 and a second component 110. The first component 108 includes a female coupling portion 118 that can be connected to an extraction instrument such as a Figure 1 The first component 108 also has an opening 112 that can be used to engage and disengage the first component 108 and the second component 110. The first component 108 defines a socket 120 in which a ball portion (in this case, the hemispherical ball portion 114 of the second component 110) is disposed.

[0075] The second component 110 includes a ball portion 114, a shank 130, a hexagonal body 124, and a threaded end connector 126 having an unthreaded pilot portion 128. This construction is similar to that of the previous second component, but differs in that a hexagonal bolt structure 124 is provided instead of the key teeth 24 of the previous configuration. In addition, a hemispherical ball portion 114 is provided instead of the full ball portion 14 provided as in the previous configuration.

[0076] Figure 8 Shows Figure 7 Another view of the device is shown, which shows a different connection structure in the form of a hexagonal drive 132 located in the flat upper surface of the hemispherical ball portion 114 of the second component 110. The hexagonal drive 132 can be engaged by a suitable screwdriver, hexagonal wrench or Allen wrench to attach the second component 110 to the prosthetic component to be extracted. In the event that the hexagonal drive 132 fails for any reason (such as excessive oscillation during use), the hexagon 124 can be used as an alternative to attach the second component 110 to the prosthetic component or remove the second component from the prosthetic component. This can be achieved using a separate tool. Alternatively, in some configurations, the first end of the first component 108 can be configured to have an inner surface that is complementary to the hexagon 124. In this alternative arrangement, the first component 108 can be pushed to slide on the second component 110 so as to engage the hexagon 124, and the first component can be rotated for use in conjunction with the second component 110. Figure 2 The previously described arrangement of complementary key teeth similarly attaches or removes the second component 110 to or from the prosthetic component.

[0077] Fig. 9 Shows Figure 7 and Figure 8 102. It can be seen that the first component 108 includes a female coupling portion 118 that can be connected to an extraction device, such as Figure 1 The first component 108 also has an opening 112 that can be used to engage and disengage the first component 108 and the second component 110. The first component 108 defines a socket 120 in which the ball portion (or in this case, the hemispherical portion 114) of the second component 110 is disposed. An internal neck portion 116 is provided at the first open end of the first component for engaging the ball portion 114 when the prosthesis is extracted via a pulling action. The second component 110 includes the ball portion 114, the handle 130, the hexagon 124, and a threaded connector 126 having a non-threaded guide portion 128.

[0078] Fig.10 Shows Fig. 91, which shows the ball portion 114 of the second component 110 engaging the neck portion 116 of the first component 108 to couple the two components together during a distraction action for extraction of the prosthetic component while also enabling relative articulation of the components. Likewise, the width of the stem 130 of the second component is somewhat narrower when compared to the width of the neck portion 116 in the first component to ensure that the components can freely articulate and are not locked together in a fixed angle configuration during the extraction procedure.

[0079] Figures 7 to 10 The variants shown are Figures 1 to 6 The variant shown is much smaller but uses the same extraction principle. The obvious difference is the screw attachment driven by an auxiliary screwdriver and a hexagonal connection. It is conceivable that this would be, for example, a flexible driver (such as a housing screw driver) that would help solve access problems during screw insertion.

[0080] In addition, despite Figures 7 to 10 The variation shown has both a hex drive 132 in the second portion and a hex 124 along the shank of the second component, but it is also contemplated that only one of these two features may be provided. Either the hex drive or the hex may be used to attach or remove the second component to or from the prosthesis via a screwing motion. The advantage of providing both is that redundancy is incorporated in the event that one of the mechanisms fails (e.g., due to excessive oscillation in use).

[0081] Although the present disclosure has been described above in conjunction with certain embodiments, it should be understood that various alternative embodiments may be provided. For example, in the two illustrated embodiments, the socket component is attached to the extraction tool and the ball component is attached to the prosthesis to be extracted. However, in an alternative configuration, the components may be reversed so that the second component is attached to the extraction tool and the first component is attached to the prosthesis to be extracted. Furthermore, although both of the two illustrated embodiments provide threaded connections for attaching the ball and socket arrangement to the extraction tool and the prosthesis, other known connections may in principle be utilized. Figures 11 to 20 Several alternative configurations are shown which are briefly discussed below.

[0082] Figures 11 to 13Several views of another device for extracting a prosthetic component from a patient are shown. Compared to the aforementioned configuration, the order of the ball component and the socket component is reversed so that the first component is attached to the prosthesis and the second component can be attached to the surgical extraction instrument. In addition, the device has a different coupling structure for driving the component to be attached to the prosthesis. The coupling structure includes a groove 140 located in the ball portion of the second component and a rod 142 extending across the socket in the first component. By pushing the second component downward, the second component slides in the socket of the first component so that the groove engages the rod in the socket. The components are then locked together so that the rotation of the second component (e.g., via the surgical extraction instrument) causes the rotation of the first component to attach the first component to the prosthesis. After being connected to the prosthesis, when the extraction force is transmitted to enable the prosthetic component to be removed from the patient, the second component can then be pulled upward to disengage the groove and the rod in the extraction configuration. In other aspects, the first component and the second component are similar in construction to those previously discussed. Specifically, the first component has a socket and a neck portion to keep the ball portion in the socket of the first component during extraction while enabling the components to articulate.

[0083] Fig.14 and Fig.15 Another apparatus for extracting a prosthetic component from a patient is shown. Figures 11 to 13 The groove and rod connector of the device is similar to the groove 140 and rod 142 connector. The main difference is that the order of the components is reversed so that the second component is attached to the prosthesis and the first component can be attached to the extraction instrument. In addition to the groove and rod connector, the second component also has a finger screw 144 that can be used to manipulate the second component.

[0084] Fig.16 Another apparatus for extracting a prosthetic component from a patient is shown. Fig.14 and Fig.15 The device shown includes a finger screw 144 on the second component. The first component and the second component are configured so that the first component can perform a large angle of joint movement relative to the second component, such as Fig.16 shown.

[0085] Fig.17 Another device for extracting a prosthetic component from a patient is shown, which is similar in construction and function to Figures 1 to 6The device shown allows the first component to be pushed downward on the second component to engage the drive mechanism for attaching the second component to the prosthesis. In this case, the Torx driver is provided with complementary surfaces 146a, 146b on the inner surfaces of the second component and the first component. Likewise, after attachment to the prosthesis, when an extraction force is transmitted to enable the prosthetic component to be removed from the patient, the first component can be pulled upward, thereby sliding back on the second component in the opposite direction to disengage the drive connector in the extraction configuration.

[0086] Fig.18 and Fig.19 Another device for extracting a prosthetic component from a patient is shown. The device includes a first component 8 and a second component 10 as in the previous embodiment. The first component 8 has a female coupling portion in the form of a socket in which a portion of the second component 10 is disposed. The socket is defined by two arms extending from the second end of the first component so that the socket has an open end. The second component 10 has a male coupling portion, a handle and an end connector 26 as in the previous configuration. The device differs from the previous configuration in that the device has a different coupling structure in the form of a ring 148 and a rod 150 configuration. The rod 150 extends across the socket in the first component 8. The male coupling part of the second component 10 includes a ring 148 disposed in the socket of the first component 8 instead of a ball, and the rod 150 extends through the ring 148 to retain the second component 10 in the first component 8. When the first and second components are coupled together, the handle of the second component extends from the ring and extends out through the open end of the socket.

[0087] Fig. 20 Another device for extracting a prosthetic component from a patient is shown, which has a different coupling structure. The male coupling portion of the second component 10 is in the form of a rotatable member 160, which is mounted on a first rod 162 in the second component 10 for rotation about a first axis. The rotatable member 160 is arranged in a socket of the first component 8, and the holder of the first component 8 is in the form of a second rod 164, which is oriented so that the rotatable member 160 can rotate about a second axis perpendicular to the first axis, the first component 8 and the second component 10 thus forming a universal joint.

[0088] There are several ways in which a prosthesis extraction system as described herein can be constructed and used. For example, a first component and a second component (e.g., a ball component and a socket component) of an articulated joint can be pre-assembled and connected to a prosthetic component in a patient's body for extraction before being attached to an extractor instrument. Alternatively, before extracting the prosthetic component, one of the first component and the second component (e.g., the ball component) can be attached to a prosthesis in the patient's body, and then the other of the first component and the second component (e.g., the socket component) can be connected to a second component in a surgical site (e.g., via an opening in the first component). Still alternatively, the prosthetic component can be provided with one of the first component and the second component already attached. For example, for a ball and socket configuration as described herein, the second component of the joint can be pre-assembled to the prosthesis (but this can be the first component in other configurations). The second component attached to the prosthetic component can then be used to dock with an inserter to insert the prosthetic component, and to serve as a docking piece with an extractor to extract the prosthetic component.

[0089] The present disclosure also provides surgical devices having the features specified in the following numbered clauses:

[0090] Clause 1: A surgical device for extracting a prosthetic component from a patient during a surgical procedure, the surgical device comprising:

[0091] a first component having sidewalls defining a cavity therein, a first end defining an open end, and a second end including a connector configured to be attached to one of a prosthetic component or a surgical extraction instrument, the first component further comprising a retainer; and

[0092] a second component having a first end defining a coupling portion, a stem extending from the coupling portion, and a second end including an end connector configured to be attached to the other of the prosthetic component or the surgical extraction instrument,

[0093] At least one of the first component and the second component further comprises a driver component for driving the component to attach to the prosthetic component,

[0094] wherein the coupling portion of the second component is configured to be disposed within the cavity of the first component and retained within the cavity by the retainer, wherein the stem of the second component extends from the open end of the first component, the coupling portion of the second component and the retainer of the first component being configured such that the coupling portion is retained within the cavity while allowing articulation of the first component relative to the second component,

[0095] The first component and the second component form an articulated joint, thereby allowing a user to: connect the surgical extraction instrument to the prosthetic component within the patient's body, articulate a portion of the surgical extraction instrument that resides outside the surgical site, and transmit an extraction force to enable removal of the prosthetic component from the patient.

[0096] Clause 2: A surgical device according to clause 1,

[0097] Wherein one of the first component and the second component is permanently attached to the surgical extraction instrument or is removably attachable to the surgical extraction instrument.

[0098] Clause 3: A surgical device according to clause 1 or 2,

[0099] Wherein the first component is configured to be attached to the surgical extraction instrument and the second component is configured to be attached to the prosthetic component.

[0100] Clause 4: A surgical device according to any preceding clause,

[0101] The first component is a socket component and the second component is a ball component, and wherein the coupling portion of the ball component is a ball portion disposed in the cavity of the socket component, the retainer of the socket component is a neck portion disposed between the cavity and the open end of the socket component, the neck portion defining an inner width that is narrower than the width of the cavity, wherein the ball portion is configured to be disposed in the cavity of the socket component, and the handle of the ball component extends through the neck portion and out through the open end of the socket component, the width of the ball portion being greater than the width of the neck portion, so that the ball portion is retained in the cavity and prevented from passing through the neck portion and the open end of the socket component, while allowing the ball component and the socket component to perform relative joint movement, the ball component and the socket component thereby forming a ball joint.

[0102] Clause 5: A surgical device according to clause 4,

[0103] Wherein the socket component includes an opening in a side wall of the socket component, the opening having a shape complementary to that of the ball component to enable the ball component to be coupled to and decoupled from the socket component.

[0104] Clause 6: A surgical device according to clause 4 or 5,

[0105] Wherein the opening in the side wall of the socket component is positioned such that the ball portion of the ball component cannot slide laterally out of the opening in the side wall when an extraction force is applied in use to enable removal of the prosthetic component from the patient.

[0106] Clause 7: A surgical device according to any one of clauses 4 to 6,

[0107] The driver component includes a drive connector disposed on the ball component between the handle and the end connector portion, the drive connector defining a surface for gripping and rotating the ball component to attach and release the ball component to the prosthetic component.

[0108] Clause 8: A surgical device according to clause 7,

[0109] The socket component also includes a drive connector, which is arranged on the inner surface of the side wall and is located between the neck portion and the open end of the socket component, and the drive connector of the socket component has a surface complementary to the drive connector on the ball component, wherein the socket component is configured to slide on the ball component to engage the drive connector so as to enable the ball component to be driven to connect the ball component to the prosthetic component in an attached configuration, and when an extraction force is transmitted to enable the prosthetic component to be removed from the patient, the socket component is configured to slide back on the ball component in an opposite direction to disengage the drive connector in an extraction configuration.

[0110] Clause 9: A surgical device according to clause 8,

[0111] Wherein the drive connector on the socket component and the ball component includes complementary key teeth.

[0112] Clause 10: A surgical device according to any one of clauses 4 to 8,

[0113] The drive connector on the ball component is a hexagonal connector.

[0114] Clause 11: A surgical device according to any one of clauses 4 to 10,

[0115] The ball portion of the ball component further comprises a driving component for driving the ball component to be attached to the prosthetic component.

[0116] Clause 12: A surgical device according to clause 11,

[0117] The driving component is a hexagonal drive.

[0118] Clause 13: A surgical device according to any one of clauses 4 to 12,

[0119] Wherein the end connector of the ball component comprises a threaded connector having an unthreaded end portion.

[0120] Clause 14: A surgical device according to any one of clauses 4 to 7,

[0121] wherein the ball portion includes a cavity and the socket component includes a complementary protrusion, wherein the socket component is configured to slide on the ball component to engage the protrusion with the cavity so as to enable the component to be driven to connect the component to the prosthetic component in an attachment configuration, and when an extraction force is transmitted to enable the prosthetic component to be removed from the patient, the socket component is configured to slide back on the ball component in an opposite direction to disengage the protrusion and the cavity in an extraction configuration.

[0122] Clause 15: A surgical device according to clause 14,

[0123] Wherein the projection is in the form of a rod and the cavity is in the form of a groove in the ball portion.

[0124] Clause 16: A surgical device according to any one of clauses 1 to 3,

[0125] wherein the coupling portion of the second component is in the form of a ring and the retainer of the first component is in the form of a rod extending through the ring of the second component to couple the first and second components together while allowing the first component to articulate relative to the second component.

[0126] Clause 17: A surgical device according to any one of clauses 1 to 3,

[0127] wherein the coupling portion of the second component is in the form of a rotatable member mounted on a rod in the second component for rotation about a first axis, the rotatable member being arranged in the cavity of the first component, and the retainer of the first component is in the form of a further rod oriented so that the rotatable member can rotate about a second axis perpendicular to the first axis, the first component and the second component thus forming a universal joint.

[0128] Clause 18: A surgical system comprising:

[0129] A surgical device according to any preceding clause; and

[0130] A surgical extraction instrument is configured to be coupled to one of the first component or the second component.

[0131] Clause 19: The surgical system of clause 18, wherein the surgical extraction instrument is a sliding hammer.

[0132] Clause 20: A surgical system according to clause 18 or 19,

[0133] Also included is a prosthetic component configured to be coupled to the other of the first component and the second component.

[0134] Clause 21: The surgical system of clause 20, wherein the prosthetic component is a femoral stem.

[0135] Clause 22: The surgical system of any of clauses 18 to 21, wherein the surgical extraction instrument is configured to be coupled to the first component and the prosthetic component is configured to be coupled to the second component.

[0136] Clause 23: A method of extracting a prosthetic component from a patient during a surgical procedure using a surgical system according to any one of clauses 18 to 22, the method comprising:

[0137] coupling the surgical device, the surgical extraction instrument, and the prosthetic component together; and

[0138] The prosthetic component is extracted by applying an extraction force to the surgical extraction instrument.

[0139] Although the present disclosure has been described above in conjunction with certain embodiments, it should be understood that various alternative embodiments can be provided without departing from the scope of the present disclosure as defined by the appended claims.

Claims

1. A surgical device for extracting a prosthetic component from a patient during a surgical procedure, the surgical device comprising: a first component having a female coupling portion at a first end and a second end configured to be connected to one of a prosthetic component or a surgical extraction instrument, the The first component also includes a retainer; and a second component having a first end defining a male coupling portion, a stem extending from the male coupling portion, and a second end configured to be connected to the other of the prosthetic component or the surgical extraction instrument, wherein the male coupling portion of the second component is configured to be disposed within the female coupling portion of the first component and retained within the female coupling portion by the retainer, wherein the stem of the second component extends away from the female coupling portion of the first component, the male coupling portion of the second component and the retainer of the first component are configured such that the male coupling portion is retained in the female coupling portion while allowing the first component to articulate relative to the second component, wherein the female coupling portion is a socket and the male coupling portion is a ball portion, the ball portion being configured to be disposed within the socket, the socket having a closed end and an open end, and the The retainer is a neck portion of the socket, the neck portion being disposed between the closed end and the open end of the socket and defining an interior width that is narrower than the width of the closed end of the socket, wherein the ball portion is configured to be disposed within the socket, wherein the stem of the second component extends through the neck portion and out through the open end of the socket, the width of the ball portion being greater than the width of the neck portion so that the ball portion is retained in the closed end of the socket and prevented from passing through the neck portion and the open end of the socket while allowing relative articulation of the ball portion and the socket, the ball portion and the socket thereby forming a ball and socket joint, and wherein the first component and the second component form an articulated joint to allow a user to: connect the surgical extraction instrument to the prosthetic component within the patient, articulate a portion of the surgical extraction instrument residing outside of the surgical site, and transmit an extraction force to enable removal of the prosthetic component from the patient.

2. The surgical device of claim 1, wherein at least one of the first component and the second component further comprises a driver component for driving the component to attach to the prosthetic component.

3. The surgical device of claim 1 or 2, wherein one of the first component and the second component is permanently attached to the surgical extraction instrument.

4. The surgical device of claim 1 or 2, wherein the first component is configured to be attached to the surgical extraction instrument and the second component is configured to be attached to the prosthetic component.

5. The surgical device of claim 1, wherein the socket includes an opening in a side wall of the socket, the opening having a shape complementary to a shape of the ball portion to enable the ball portion to be coupled to and decoupled from the socket.

6. A surgical device according to claim 5, wherein the opening in the side wall of the socket is positioned such that the ball portion cannot slide laterally out of the opening in the side wall when an extraction force is applied in use to enable removal of the prosthetic component from the patient.

7. The surgical device of claim 2, wherein the driver component includes a drive connector disposed on the second component and located between the handle and the second end, the drive connector defining a surface for grasping and rotating the second component to attach the second component to the prosthetic component and release the second component from the prosthetic component.

8. The surgical device of claim 2, wherein the drive connector on the second component is a hexagonal connector.

9. The surgical device according to claim 1 or 2, wherein the ball portion of the second component further comprises a drive component for driving the second component to be attached to the prosthetic component.

10. The surgical device of claim 9, wherein the drive member is a hexagonal drive.

11. The surgical device of claim 1 or 2, wherein the end connector on the second end of the second component comprises a threaded connector having an unthreaded end portion.

12. A surgical system comprising: A surgical device according to any preceding claim; and A surgical extraction instrument is configured to be coupled to one of the first component or the second component.

13. The surgical system of claim 12, wherein the surgical extraction instrument is a slide hammer.

14. The surgical system of claim 12 or 13, further comprising a prosthetic component configured to be coupled to the other of the first component and the second component.

15. The surgical system of claim 14, wherein the prosthetic component is a femoral stem.

16. The surgical system of claim 12 or 13, wherein the surgical extraction instrument is configured to be coupled to the first component and the prosthetic component is configured to be coupled to the second component.

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