WO2019164441A1

WO2019164441A1 - A mount for attaching an accessory to a medical instrument

Info

Publication number: WO2019164441A1
Application number: PCT/SE2019/050159
Authority: WO
Inventors: Morgan Andersson
Original assignee: ORTOMA AB
Current assignee: ORTOMA AB
Priority date: 2018-02-25
Filing date: 2019-02-22
Publication date: 2019-08-29
Anticipated expiration: 2020-08-25

Abstract

A mount for attaching an accessory to a medical instrument is disclosed. The mount comprises a first clamp member, a second clamp member, and an instrument receiving portion at which the mount is attachable to the medical instrument. The mount has an assembled state wherein the first clamp member and the second clamp member are connected, and a disassembled state wherein the first clamp member and the second clamp member are disassembled. The instrument receiving portion is positioned between the first clamp member and the second clamp member in the assembled state of the mount. At least one of the first clamp member and the second clamp member has a pair of arms, and the other of the first clamp member and second clamp member has a pair of slots configured to receive the pair of arms.

Description

A MOUNT FOR ATTACHING AN ACCESSORY TO A MEDICAL INSTRUMENT

Field of the Invention

This invention pertains in general a mount for attaching an accessory to an instrument, such as a medical instrument. More particularly, the invention relates to a mount that has an assembled state wherein a first clamp member and a second clamp member are connected, and a disassembled state wherein the first clamp member and the second clamp member are

disassembled. An instrument receiving portion may be positioned between the first clamp member and the second clamp member in the assembled state of the mount. At least one of the first clamp member and the second clamp member has a pair of arms, and the other of the first clamp member and second clamp member has a pair of slots configured to receive the pair of arms.

The mount may be used with a navigation system for tracking objects in an area of interest. More particularly, the invention can be implemented into a surgical navigation system for tracking position and orientation of surgical instruments, including implants, relative position and orientation of patient anatomy during surgery. The position and orientation data of the instrument may be presented in real-time in relation to a pre-operative plan including a virtual representation of the patient anatomy. The navigation system comprises a plurality of trackers. A tracker may be attached to the instrument using the mount. Each of the tracker and the mount comprises a tracker interface. Hence, the mount according to the invention allows for attaching a tracker with a standard shape to an instrument of arbitrary shape not having an attachment interface corresponding to the attachment interface of the tracker. This in turn allows for tracking of a standard instrument not designed for use with the navigation system.

Background of the Invention

Accessories may be attached to medical instruments using a mount. For example, medical navigation systems can be used to track medical instruments in 3D space during the medical procedure. The medical procedure may be a dental or surgical procedure, such as an orthopedic procedure. The navigations systems commonly comprise an accessory in the form of a tracker, or trackable marker, to be attached to the medical instrument. The trackable marker can be attached and detached to the instrument by a mount, such that a general navigation system can be used with any medical instrument. The mount has an attachment interface complementary to the shape of an attachment interface of the trackable marker. Also, the mount has an instrument receiving portion, at which the medical instrument is receivable such that the mount can be attached thereto.

Many types of orthopedic replacement systems, such as hip, knee, foot and ankle, shoulder, elbow, and spine replacement systems, are commonly available. These systems comprise implants including various components for total replacements of a piece of the patient’s anatomy. Each system comprises a range of components, including various sizes. For example, a hip replacement system can comprise an acetabular component, which includes an acetabular shell, and acetabular insert, and a bearing, and the femoral component, which includes the femoral stem. The systems can be cemented or press-fit. Furthermore, a wide variety of system specific instruments are used with each replacement system. Again taking a hip replacement system as an example, such as system may include instruments including osteotomes, reamers, saws, handles, planars, reamers, stem inserters, stem impactors, head impactors, chisels, broach handles, and trial components. Many times, the instruments are combined in kits, which include the required instrumentation for a particular replacement system. The instruments are to a large extent for multiple use.

Furthermore, different replacement systems may be available on different markets. On each market, a number of competitive replacement systems are often available. On top of this, different replacement systems are available for the various surgical fields exemplified above. In summary, that means that there are a large number of replacement systems, and an even larger number of implant components and instruments, available on the global market. What has been described above with regard to orthopedic systems is also applicable to dental instruments.

In medical procedures, the components frequently need to be washed and sterilized before the procedure commences. This includes any multiple use mount for attaching accessories to the instruments. In the washing and sterilization procedures, all components of the mount need to be disassembled. After washing and sterilization, the mount is attached to the medical instrument before the medical procedure commences. The mount needs to be designed such that washing and sterilization fluids may access all surfaces of the instrument for effective cleaning and sterilization. At the same time, the mount should be easy to assemble and disassemble for multiple use, and provide a stable attachment to the component to which it is attached.

Hence, an improved mount for attaching an accessory to a medical instrument of arbitrary shape would be advantageous, and in particular allowing for effecting cleaning and sterilization, easy assembly and disassembly, stability and/or patient safety.

Summary of the Invention

Accordingly, embodiments of the present invention preferably seek to mitigate, alleviate or eliminate one or more deficiencies, disadvantages or issues in the art, such as the above-identified, singly or in any combination by providing the mount and method according to the appended patent claims.

Embodiments comprise a mount for attaching an accessory to a medical instrument. The mount comprises a first clamp member, a second clamp member, and an instrument receiving portion at which the mount is attachable to the medical instrument. The mount has an assembled state wherein the first clamp member and the second clamp member are connected, and a disassembled state wherein the first clamp member and the second clamp member are disassembled. The instrument receiving portion is positioned between the first clamp member and the second clamp member in the assembled state of the mount. At least one of the first clamp member and the second clamp member has a pair of arms, and the other of the first clamp member and second clamp member has a pair of slots configured to receive the pair of arms.

An attachment interface may be attached to at least one of the first clamp member and the second clamp member. The attachment interface may be configured to attach the accessory to the mount. The attachment interface and at least one of the clamp members may be a monolithic component. Furthermore, in some embodiments, the mount comprises an accessory formed as a monolithic part of at least one of the first clamp member and the second clamp member.

Each arm of the pair of arms, and each slot of the pair of slots, may be positioned on opposing sides of the instrument receiving portion with respect to the other arm and the other slot, respectively.

Each of the first clamp member and the second clamp member may comprise a pair of slots and a pair of arms. Each arm of the first clamp member may be configured to be received in one of the slots of the second clamp member. Each arm of the second clamp member may be configured to be received in a slot of the first clamp member.

A free end of each arm of the pair of arms of the first clamp member may be directed in a proximal direction of the mount. A free end of each arm of the pair of arms of the second clamp member may be directed in a distal direction of the mount.

An arm and a slot may form a hook. Hence, each of the first clamp member and the second clamp member may comprise two hooks, where each hook is formed by one arm and one slot. The hooks of the first clamp member and the hooks of the second clamp member may be directed in opposing directions. The mount may be assembled by hooking the second clamp member to the first clamp member, or vice versa.

Each slot may be positioned circumferentially, relative the longitudinal axis of the mount, between the one of the arms of the pair of arms and a body portion of at least one of the first clamp member and the second clamp member.

The pair of arms and the pair of slots may be spaced circumferentially around the instrument receiving portion. A radial length of each arm of the pair of arms may be at least partially smaller than a radial length of each slot of the pair of slots.

Each arm may have a base portion and a free end. A radial length at the free end of at least one arm may be at least partially longer than a radial length at the base portion. The slot may have an open end and a closed end. A radial length at the closed end of at least one slot may be at least partially longer than a radial length at the opened end of the at least one slot.

The pair of arms and the pair of slots may be complementary in shape. Optionally or additionally, a portion of at least one arm of the pair of arms and a portion of at least one slot of the pair of slots may be shaped to lock the first clamp member and the second clamp member in the longitudinal direction of the mount.

The mount may comprise a threaded bolt. Only one of the first clamp member and the second clamp member may comprise a threaded through hole from an outer circumference of the mount into the instrument receiving portion. The bolt may be threadable such that a tip thereof extends into the instrument receiving portion to abut a portion of the instrument when received therein. Thus, the first clamp member and the second clamp member may be pushed apart as the bolt is threaded into the instrument receiving portion while the tip is abutting the instrument.

Embodiments comprise a method of attaching a mount to a medical instrument. The method comprises providing a first clamp member having a pair of arms; providing a second clamp member having a pair of slots; and positioning the pair of arms of the first clamp member in the pair of slots of the second clamp member.

Embodiments described herein provides for a mount with relatively few parts. This make the mount easy to handle, e.g. during cleaning and sterilization procedures and to attach to and detach from a medical instrument. Furthermore, the design also provides for effective cleaning and sterilization as such. Particularly, embodiments provides for initially attaching the mount to the medical instrument, before it is firmly attached by clamping to the medical instrument. Embodiments provides for attaching the mount to the medical instrument by hand without using any additional tools, which also provides for easy handling. A single bolt or screw may be used to fasten the mount the instrument. Furthermore, the embodiments provide for firm and stable attachment of the mount to a component. Additionally, embodiments provides for avoiding accidental disassembly and thereby increased reliability and safety. Also, the basic clamping mechanism of the embodiments presented herein may be the same for mounts designed for different instruments, while the instrument receiving portion of the various mounts of the set may vary. Hence, a set of mounts may be provided for a set of different instruments, where each of the mounts in the set is assembled and disassembled in the same way. This also contributes to easy and efficient handling of each of the mounts of the set, as well as to a uniform approach for cleaning and sterilization.

Further embodiments of the invention are defined in the dependent claims.

It should be emphasized that the term“comprises/comprising” when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.

Brie† Description of the Drawings

These and other aspects, features and advantages of which embodiments of the invention are capable of will be apparent and elucidated from the following description of embodiments of the present invention, reference being made to the accompanying drawings, in which Fig. 1a is a bottom view from a distal side of an embodiment of a mount;

Fig. 1b is a side view of the mount of Fig. 1a;

Fig. 1c is a side view of the mount of Fig. 1a-1b rotated 90 degrees around the longitudinal axis of the mount compared to the side view of Fig. 1b;

Fig. 1d is a side view of the mount of Figs. 1a-1c attached to a cup inserter and an accessory;

Fig. 2a is a side view of an embodiment of a mount;

Fig.2b is a top view from a proximal side of the mount of Fig. 2a;

Fig. 2c is a side view of the mount of Fig. 2a-2b rotated 90 degrees around the longitudinal axis of the mount compared to the side view of Fig. 2a;

Fig. 2d is a side view of the mount of Fig.2a-2c attached to a reamer handle and an accessory; and

Figs. 3a-3e are side and bottom views of the mount in various stages of connecting the first clamp member to the second clamp member.

Description of Embodiments

Specific embodiments of the invention will now be described with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. The terminology used in the detailed description of the embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like numbers refer to like elements.

The following description focuses on embodiments of the present invention applicable to a surgical navigation system. However, it will be appreciated that the invention is not limited to this application but may be applied to many other procedures, such as other navigation systems where the position and/or orientation of an object is tracked, or where an accessory should be attached to a medical instrument. The examples given in the below embodiments relate to a hip replacement surgery. Other embodiments include knee surgery, spine surgery, elbow surgery, ankle surgery, and other replacement surgeries, as well as dental procedures where an accessory is to be attached to an instrument.

In the below embodiments, reference is made to tracking position and orientation of instruments. In this context, the term instruments, in addition to instruments for the surgical examples given herein, include implant components, such as for replacement of patient anatomy or adding into the patient anatomy, as well as for temporary attachment of components of the replacement system during the surgical intervention. Such temporary components may include threaded screws or unthreaded nails for temporary attaching trackers to the patient anatomy during surgery in the same way as the trackers are attached to the attachment components, as will be described herein.

Furthermore, instruments include surgical guides that may attached to the anatomy or implants for guiding the instrument or checking accuracy of an installed implant, such as checking rotation, position, and/or orientation of an implant.

Figs. 1a-1c illustrate embodiments of a mount 1 for attaching an accessory 2 to a medical instrument.

Fig. 1d illustrates the mount 1 attaching the accessory 2, exemplified by a tracker of a navigation system, at one end of the mount 1. The mount 1 is attached to an instrument 3, exemplified by a cup inserter of a hip replacement system, at another end of the mount 1.

The mount comprises a first clamp member 4 and a second clamp member 5. In some embodiments, the mount 1 comprises an attachment interface 6 attached to at least one of the first clamp member 4 and the second clamp member 5. The attachment interface 6 may be configured to attach the accessory 2 to the mount 1 in a non-rotational manner. As can be seen in Fig. 1b, the attachment interface may comprise at least one protrusion 6a, 6b, and a recess 6c, which may be threaded to receive a threaded screw to firmly attach the accessory to the mount 1. In other embodiments, the attachment interface is a single recess or protrusion with an anti-rotational feature, such as a non-round protrusion or recess, e.g. hexagonal, and a threaded end section which may engage a threaded screw or bolt. The accessory may have a section with a shape that is complementary to the shape of the attachment interface, such that it may not rotate relative the mount 1. The mount 1 and the accessory may be connected together using the screw or bolt (not illustrated). In still other embodiments, the accessory is formed as a monolithic part of the mount, i.e. formed integral therewith without any attachment interface.

As can be seen in Fig. 1a, the mount 1 comprises an instrument receiving portion 7 at which the mount 1 is attachable to the instrument 3. In some embodiments, as is illustrated in Fig. 1a, a first section 7a of the instrument receiving portion 7 is provided at the first clamp member 4. A second section 7b of the instrument receiving portion 7 may be provided at the second clamp member 5. The first section 7a and the second section 7b of the instrument receiving portion 7 may be opposing surfaces of the first clamp member 4 and the second clamp member 5, respectively, in an assembled state of the mount 1. The assembled state of the mount 1 is illustrated in Figs. 1a-1d. A disassembled state of the mount 1 is illustrated in Figs. 3a-3c. A partially assembled/disassembled state of the mount 1 is illustrated in Figs. 3d-3e. Thus, the instrument receiving portion 7 may be positioned between the first clamp member 4 and the second clamp member 5 in the assembled state of the mount 1.

Returning to Figs. 1a-1c, the mount 1 is illustrated in the assembled state, wherein the first clamp member 4 and the second clamp member 5 are connected. In the disassembled state, the first clamp member 4 and the second clamp 5 member are disassembled. As is illustrated, the first clamp member 4 and the second clamp member 5 are completely disassembled, i.e. there are no joints connecting the clamp member 4, 5 in the disassembled state. Hence, fluids may easily access all surfaces of the mount during cleaning and sterilization, which facilities for efficient cleaning and sterilization.

At least one of the first clamp member 4 and the second clamp member 5 has a pair of arms 8a, 8b, 9a, 9b. The other of the first clamp member 4 and second clamp member 5 has a pair of slots 10a, 10b, 11 a, 11 b configured to receive the pair of arms 8a, 8b, 9a, 9b. As can be seen in Fig. 3a-3c each slot 10a, 10b of the first clamp member 4 may be located between one of the arms 8a, 8b and a body portion 12a of the first clamp member 4. Similarly, each slot 11 a, 11 b of the second clamp member 5 may be located between one of the arms 9a, 9b and a body portion 12b of the second clamp member 5. As is illustrated, the slots 10a, 10b, 11 a, 11 b may be open at least at one side relative a longitudinal axis L of the mount 1. Hence, fluids may easily access all surfaces, also at the slots 10a, 10b, 11a, 11b of the mount 1 during cleaning and sterilization, which facilities for efficient cleaning and sterilization. Alternatively, the slots are circumferential slots, such as tubular, in at least one of the body portions 12a, 12b, which may enhance guiding of the arms 8a, 8b, 9a, 9b relative the slots 10a, 10b, 11a, 11b. Providing a pair of arms 8a, 8b, 9a, 9b and a pair of slots 10a, 10b, 11 a, 11 b provides for easy assembly of the mount 1. For example, one arm 8a, 8b, 9a, 9b and one slot may form a hook. Hence, each of the first clamp member 4 and the second clamp 5 member may comprise two hooks, where each hook is formed by one arm and one slot. The hooks of the first clamp member 4 and the hooks of the second clamp member 5 may be directed in opposing directions, such as can be seen in Figs. 1c and 2a. The mount 1 may be assembled by hooking the second clamp member 5 to the first clamp member 4, or vice versa.

In some embodiments, each arm 8a, 8b, 9a, 9b of the pair of arms, and each slot 10a,

10b, 11 a, 11 b of the pair of slots are positioned on opposing sides of the instrument receiving portion 7 with respect to the other arm and the other slot, respectively. This can be seen in Figs. 1a-1d. For example, a first arm 8a, 9a of the pair of arms, may be located 180 degrees relative the longitudinal axis L of the mount 1 with respect to a second arm 8b, 9b of the pair of arms. Similarly, a first slot 10a, 11a of the pair of slots, may be located 180 degrees relative the longitudinal axis L of the mount 1 with respect to a second slot 10b, 11 b of the pair of slots. Hence, each of the first clamp member 4 and the second clamp member 5 may be rotationally symmetrical with respect to its arms 8a, 8b, 9a, 9b and its slots 10a, 10b, 11a, 11b and relative the longitudinal axis L of the mount 1. This facilitates easy assembly of the mount 1. It also facilitates even distribution of forces to the arms 8a, 8b, 9a, 9b and slots 10a, 10b, 11 a, 11 b when the mount 1 is clamp to an instrument. This in turn provides for a stable connection to the instrument.

As is illustrated in Figs. 1a-1d, in some embodiments each of the first clamp member 4 and the second clamp member 5 comprises a pair of arms 8a, 8b, 9a, 9b and a pair of slots 10a,

10b, 11a, 11b. Each arm 8a, 8b of the first clamp member 4 may be configured to be received in one of the slots 11 a, 11 b of the second clamp member 5. Each arm 9a, 9b of the second clamp member 5 may be configured to be received in one of the slotsl Oa, 10b of the first clamp member 4.

In some embodiments, as is illustrated in Figs. 3a-3b, a free end 13 of each arm 8a, 8b of the pair of arms of the first clamp member 4 is directed in a first direction, such as a distal direction of the mount 1 , and a free end 14 of each arm 9a, 9b of the pair of arms of the second clamp member 5 is directed in a second direction, such as proximal direction of the mount 1. The first direction and the second direction may be opposite directions, such as pointing 180 degrees relative to each other. This provides for sliding the arms 8a, 8b, 9a, 9b into the slots 10a, 10b, 11a, 11b, as is illustrated in Fig. 3d. If the instrument receiving portion is snugly fit around the instrument 3, such as with a fit that is smaller than a width or thickness of the arms and slots, respectively, the arms 8a, 8b,

9a, 9b will be guided by the slots 10a, 10b, 11 a, 11 b during assembly of the mount 1 from the disassembled state to the assembled state. This provides for easy assembly of the mount 1.

Each slot 10a, 10b, 11a, 11b may be positioned circumferentially, relative the longitudinal axis L of the mount 1 , between the one of the arms 8a, 8b, 9a, 9b of the pair of arms and the body portion 12, 13 of at least one of the first clamp member 4 and the second clamp member 5. Furthermore, the pair of arms 8a, 8b, 9a, 9b and the pair of slots 10a, 10b, 11 a, 11 b may be spaced circumferentially around the instrument receiving portion 7.

In some embodiments, as can be seen in Fig. 1c, a radial length L1 of each arm 8a,

8b, 9a, 9b of the pair of arms is at least partially smaller than a radial length L2 of each slot 10a, 10b, 11a, 11b of the pair of slots.

In some embodiments, each arm 8a, 8b, 9a, 9b has the free end 13, 14 and a base portion 15, 16. As can be seen in Fig. 1c, a radial length L3 at the free end 13, 14 of at least one arm of the first clamp member 4 and/or the second clamp member 5 is at least partially longer than the radial length L1 at the base portion 15, 16 of the at least one arm. As is illustrated in Fig. 1c, the radial length L3 at the free end 13, 14 of the arm of the first clamp member 4 may be least partially longer than the radial length L1 of the arm at the base portion 15 of the first clamp member 4, whereas the radial length L4 of the arms 9a, 9b of the second clamp member 6 are substantially the same at the free end 14 and the base portion 16 thereof.

Each slot 10a, 10b, 11a, 11b may have an open end and a closed end. A radial length L5 at the closed end of at least one slot 10a, 10b, 11 a, 11 b may be at least partially longer than the radial length L2 at the opened end of the at least one slot 10a, 10b, 11a, 11b, as is illustrated in Fig. 1c.

As can be seen in Fig. 3d where the free end 13 of arm 8a overlaps the free end 14 of arm 9a for illustrative purposes, the radial length L3 of the free end of arm 8a may be substantially the same or slightly smaller than the radial length L2 of the open end of slot 11 a. The same relationship may apply with respect to arm 8b and slot 11b, respectively. However, in some embodiments, only one of the arms 8a, 8b and one of the slots 11 a, 11 b, respectively, have this relationship. Hence, in some embodiments, the pair of arms and the pair of slots are complementary in shape and non straight. Hence, in some embodiments, a portion of at least one arm 8a, 8b, 9a, 9b of the pair of arms of the first clamp member 4 and a portion of at least one slot 11a, 11b of the pair of slots of the second clamp member 5 may be shaped to lock the first clamp member 4 and the second clamp member 5 in the longitudinal direction of the mount 1. As the clamp members 4, 5 are pushed apart (described below), the wider free end of the arm(s) 8a, 8b of first clamp member 4 will engage the wider closed end of the slot 11a, 11b of the second clamp member s, as can be seen 2d. Hence, the first clamp member 4 and the second clamp member 5 are locked along the longitudinal axis L of the mount 1.

In some embodiments, such as illustrated in Figs. 1c, 1d, 3a, and 3b, the mount 1 may comprise a threaded bolt 17. In some embodiments, only one of the first clamp member 4 and the second clamp member 5 comprises a threaded through hole from an outer circumference of the mount 1 into the instrument receiving portion 7. A single threaded through hole is provided in some embodiments. The bolt may be threaded into the threaded through hole such that a tip 18 of the bolt 17 extends into instrument receiving portion 7, as can be seen in Fig.3b. The threaded through hole is arranged such that the tip 18 of the bolt 17 may extend into and be received in the instrument receiving portion 7. The tip 18 may abut a portion of the instrument 3 when received in the instrument receiving portion 7. When the bolt is further inserted into the threaded though hole and as the tip 18 abuts the instrument, the clamp member 4, 5 comprising the threaded thorough hole is pushed away from the instrument, and thus apart from the other of the clamp member 4, 5. This can be seen in Fig. 2d. Hence, the instrument 6 is clamped between the first clamp member 4 and the second clamp member 5. A head of the bolt 17 may be plate or wing shaped, such that the bolt 17 may be gripped with two fingers and threaded using hand force. This contributes to easy assembly, since no tools need to be used for the attachment of the mount 1 to the instrument 3. Alternatively, the head of the bolt 17 disc shaped. A wing shaped head may be preferred when higher torque is to the applied with hand force.

As can be seen in Fig. 1d, the free end 13 of the first clamp member 4 is curved at a side facing away from the threaded through hole of the second clamp member 5 in the assembled state. Also, the closed end of the slot 11a of the second clamp member 5 has a curved portion at a side facing away from the threaded through hole of the second clamp member 5. The curved end of the free end 13 is received in the curved portion of the slot 11a. Hence, when the clamp members 4, 5 are spaced apart from the instrument 3 by the bolt 7, the clamp members 4, 5 are locked to each other in the longitudinal direction of the mount 1 , as discussed above with regard to the radial length of the of the arms 8a, 8b and slots 11a, 11b, respectively.

Fig. 1d illustrates the accessory 2 and the mount 1. The accessory 2 is exemplified by a tracker, such as a trackable marker of a navigation system. The accessory 2 may have an attachment interface that is complementary in shape to the attachment interface 6 of the mount 1. Alternatively, the accessory is formed integral with at least one of the clamp members 4, 5, which together form a monolithic component.

The attachment interface 6 may be attached to the body 12, 13 of at least one of the first clamp member 4 and the second clamp member 5. In the embodiment of Figs. 1a-1d and 3a-3e, the attachment interface is attached to the second clamp member 5. Similarly, there threaded though hole and the bolt 7 may be provided in the at least one of the first clamp member 4 and the second clamp member 5. In the embodiment of Figs. 1a-1d and 3a-3e, the threaded through hole and the bolt 17 are provided at the second clamp member 5. The attachment interface 6 may be provided at one end of a rod 19. The other end of the rod 19 may be attached to the at least one of the first clamp member 4 and the second clamp member 5. The rod and the clamp member 4, 5 may for a monolithic component.

As can be seen in Fig. 3a, at least one of the first clamp member 4 and the second clamp member 5 may comprise third section 7c of the instrument receiving portion 7. For example and as is illustrated with regard to the first clamp member 4, the body 12 may comprise a through hole, through which a portion of the instrument 3 may extend. The illustrated embodiment has a third section in the form of a circular through hole, through which a handle of the instrument 3 may extend, such as is illustrated in Fig. 1d. Thus, the first clamp member 4 may first be positioned relative the instrument 3, before being attached to the second clamp member 5. This makes assembly easier, since a user does not need to hold the first clamp member 4 while the second clamp member is attached thereto. Hence, easy assembly is further provided for.

Figs. 2a-2d illustrates an embodiment of a mount 100 attachable to an instrument 103, exemplified by a reamer handle of a replacement system. A difference compared to the

embodiments of Fig. 1a-1d and 3a-3e is that the attachment interface 6 is attached to the first clamp member 104. The bolt 17 is provided at the second clamp member 105. Furthermore, the rod 19 is tilted differently in the embodiments of Figs. 2a-2d compared to the embodiments of Fig. 1a-1d and 3a-3e. In the embodiments of Fig. 2a-2d, the rod is substantially perpendicular relative the longitudinal axis L of the mount 100. In the embodiments of Fig. 1a-1d and 3a-3e, the end of the rod 19 at which the attachment interface 6 is provided is tilted towards the proximal end of the mount 1. The embodiments of Figs. 2a, 2d may have any of the features described above with regard to Figs. 1a-1d, and 3a-3e. Providing the attachment interface at a rod 19 increases the flexibility of the mount

1, 100, since different mounts 1 , 100 may have attachment interfaces tilted at different angles relative the instrument receiving portion 7, such that the different mount may be designed to be attached to differently shaped instruments. Yet, the different mounts are assembled in the same way.

The attachment interface may be provided at a head 20, 120 of the rod 19. The head 20, 120 may have a first head portion 20a, 120a and a second head portion 20b, 120b. The first head portion 20a may be moveable relative the second head portion 20b, as is illustrated in Figs laid and 3a-3e. The position of the first head portion 20a may be lockable relative the second head portion 20b, such as by a threaded connection and/or a non-rotational snap fit connection (not illustrated). Alternatively, the first head portion 120a and the second head portion 120b are produced as separate components, such as provided by the first head portion 20 and second head portion 20b of the embodiments of Figs. 1a-1d and 3a-3e, and welded or otherwise permanently fixed together during production such that the head 120 is provided as a monolithic component, which is illustrated in Fig. 2a. This allows for using the same components during production, that can be angled relative each other to achieve a desired tilt relative the instrument receiving portion for a particular mount 1 , 100. Hence, the mount 1 , 100 of embodiments of described herein are very flexible, and the angle of the attachment interface 6 relative the instrument receiving portion 7 may vary depending on the angle and/or a direction relative other components, such as a camera of a navigation system. For example, an optimum angle between a camera of a navigation system and the accessory, such as the tracker, may be desired. Depending on the shape of the instrument, the angle between the attachment interface 6 relative the instrument receiving portion 7 may vary between different mounts 1, 100 to obtain the optimum angle between a camera of a navigation system and the accessory. This has been exemplified by the cup inserter instrument and the reamer handle. Hence, the mount 1, 100 according to the invention is very flexible, at the same time as the mount is easy to assemble and disassembly as well as easy to clean and sterilize.

Figs. 3a-3e illustrates a method of assembling the mount 1. The mount 1 , 100 may be according to the embodiments described above.

As is illustrated in Figs. 3a-3c, the first clamp member 4 and the second clamp member

5 are provided in a disassembled state.

The pair of arms 8a, 8b, 9a, 9b of at least one of the first clamp member 4 and the second clamp member 5 is positioned in a pair of slots 10, 10b, 11 a, 11 b of at least one of the first clamp member 4 and the second clamp member 5 to an assembled state illustrated in Fig. 1a-1c and 2a-2c.

In some embodiments, a free end 13, 14 of each arm 8a, 8b, 9a, 9b, is initially received at an open end of each slot 10a, 10b, 11a, 11b, as is illustrated in Figs. 3d-3e, wherein a partially assembled state is achieved. Then the arms 8a, 8b, 9a, 9b are guided along the slotslOa, 10b, 11a, 11b until the free end 13, 14 reaches a closed end of the slotslOa, 10b, 11a, 11b. Thus, one of the clamp members 4, 5 may be hooked to the other of the clamp members 4, 5, such as along the longitudinal direction L of the mount. This makes it particularly easy to assemble and disassemble the mount 1 , 100. Yet the components are completely separated, which provides for two separate monolithic components that are easy to wash and sterilize.

In some embodiments, as is illustrated in Figs. 1d and 2d, the method comprises positioning the instrument receiving portion 7 of the mount 1 , 100 at least partially around the instrument 3, 103. The first section 7a of the instrument receiving portion 7 of the mount 1 , e.g. provided at the first clamp member 4, 204 may be positioned partially around the instrument. Then, second section 7b of the instrument receiving portion 7 of the mount 1 , 100, e.g. provided at the second clamp member 5, may be positioned partially around the medical instrument. Together, the first clamp member 4 and the second clamp member 5 may be provided circumferentially around a portion of the instrument 3, 103.

The method may comprise connecting the first clamp member 4, 104, and the second clamp member 5, 105 to the instrument 3, 103, such as pushing the clamp members 4, 5, 104, 105 apart, such as using the bolt 17 discussed above. Additionally , the first clamp member 4, 104, and the second clamp member 5, 105 may be locked in the longitudinal direction of the mount 1 , 100 by positioning a curved free end of at least one arm 8a, 8b, into a curved closed end of a slot 11a, 11b, where the curved free end has a radial length L3 that is longer than the radial length L1 of the base 15 of the arm 8a, 8b, and a radial length L5 of the curved closed end of a slot 11a, 11b is longer that a radial length L2 of the opened end of the slot 11a, 11b, as is illustrated in Fig. 1c. Further embodiments of the method are derivable from the description of Figs. 1a-1d, 2a-2d, and 3a-3e

The mount 1 , 100 according to embodiments presented herein may be used for a surgical navigation system, such as disclosed in W02014025305 by the same applicant as the applicant of the present invention, which is incorporated herein in its entirety for all purposes. Furthermore, the present invention provides improvements to the attachment component described in

WO2016SE51118, by the same applicant as the applicant of the present invention, which is incorporated herein in its entirety for all purposes.

It should be emphasized that many variations and modifications may be made to the above-described embodiments, the elements of which are to be understood as being among other acceptable examples. All such modifications and variations are intended to be included herein within the scope of this disclosure and protected by the following claims.

The present invention has been described above with reference to specific embodiments. However, other embodiments than the above described are equally possible within the scope of the invention. Different method steps than those described above may be provided within the scope of the invention. The different features and steps of the invention may be combined in other combinations than those described. The scope of the invention is only limited by the appended patent claims.

Claims

1. A mount for attaching an accessory to a medical instrument, the mount comprising: a first clamp member;

a second clamp member;

an instrument receiving portion at which the mount is attachable to the medical instrument; wherein

the mount has an assembled state wherein the first clamp member and the second clamp member are connected, and a disassembled state wherein the first clamp member and the second clamp member are disassembled;

the instrument receiving portion is positioned between the first clamp member and the second clamp member in the assembled state of the mount, and

at least one of the first clamp member and the second clamp member has a pair of arms, and the other of the first clamp member and second clamp member has a pair of slots configured to receive the pair of arms.

2. The mount according to claim 1 , wherein each arm of the pair of arms, and each slot of the pair of slots are positioned on opposing sides of the instrument receiving portion with respect to the other arm and the other slot, respectively.

3. The mount according to any of the previous claims, wherein each of the first clamp member and the second clamp member comprises a pair of slots and a pair of arms, wherein each arm of the first clamp member is configured to be received in one of the slots of the second clamp member, and each arm of the second clamp member is configured to be received in a slot of the first clamp member.

4. The mount according to any of the previous claims, wherein a free end of each arm of the pair of arms of the first clamp member is directed in a proximal direction of the mount, and a free end of each arm of the pair of arms of the second clamp member is directed in a distal direction of the mount.

5. The mount according to any of the previous claims, wherein each slot is positioned circumferentially, relative the longitudinal axis of the mount, between the one of the arms of the pair of arms and a body portion of at least one of the first clamp member and the second clamp member.

6. The mount according to any of the previous claims, wherein the pair of arms and the pair of slots are spaced circumferentially around the instrument receiving portion, and wherein a radial length of each arm of the pair of arms is at least partially smaller than a radial length of each slot of the pair of slots.

7. The mount according to any of the previous claims, wherein each arm has a base portion and a free end, wherein radial length at the free end of at least one arm is at least partially longer than a radial length at the base portion, and wherein the slot has an open end and a closed end, wherein a radial length at the closed end of at least one slot is at least partially longer than a radial length at the opened end of the slot.

8. The mount according to any of the previous claims, wherein the pair of arms and the pair of slots are complementary in shape, and optionally a portion of at least one arm of the pair of arms and a portion of at least one slot of the pair of slots are shaped to lock the first clamp member and the second clamp member in the longitudinal direction of the mount.

9. The mount according to any of the previous claims, comprising a threaded bolt, and wherein only one of the first clamp member and the second clamp member comprises a threaded through hole from an outer circumference of the mount into the instrument receiving portion, wherein the bolt is threadable such that a tip thereof extends into the instrument receiving portion to abut a portion of the instrument when received therein such that the first clamp member and the second clamp member are pushed apart.

10. A method of attaching a mount to a medical instrument, comprising: providing a first clamp member having a pair of arms;

providing a second clamp member having a pair of slots; and

positioning the pair of arms of the first clamp member in the pair of slots of the second clamp member.