Method and apparatus for reducing vibration

Abstract

An assembly for holding a tool is disclosed. The assembly can selectively reduce and / or eliminate vibrations received and felt by a user. Reducing vibrations can reduce or eliminate chatter at a working end of the tool.

Description

[0001] This invention patent application is a divisional application of the invention patent application with international application number PCT / US2016 / 058689, international application date October 25, 2016, application number 201680070401.1 entering the Chinese national phase, and name “Method and apparatus for reducing vibration”. Technical Field

[0002] The present disclosure relates to reducing the amount of vibration, and more particularly to alleviating and minimizing vibration of a handle caused by movement of a tool head. Background Art

[0003] This section provides background information related to the present disclosure which is not necessarily prior art.

[0004] Surgery can be performed on a subject to facilitate removal of selected material. In various procedures, such as surgical procedures, tissue can be removed from a subject, such as by cutting or excising the tissue. The various tissues may include soft tissue or hard tissue. During removal or extension of hard tissue, motorized instruments may be used for excision and cutting of tissue. During various procedures, such as surgery on the spine, instruments may be used to remove bone tissue from nearby sensitive areas.

[0005] For example, during spinal surgery, bone tissue may be removed from nearby nerves extending from the patient's spine. The removal of bone tissue may help relieve pressure on the nerves to relieve pain. Thus, the removal may be performed near sensitive tissue such as nerve bundles, where precise and controlled removal is selected. Summary of the invention

[0006] This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.

[0007] An assembly is disclosed that can be coupled to a tool and hold the tool. The tool can be a resection tool, such as a bone resection tool. In various embodiments, the tool can include an elongated shaft having a working end at the end of the shaft. The shaft can be coupled to a motor to provide torque to the tool for rotating the tool during operation. The operation can include resecting bone tissue or other tissue from a subject.

[0008] The assembly includes an attachment assembly that holds the tool relative to the motor. The attachment assembly may include an attachment base and an attachment tube that can be connected to the chuck. The chuck may include various gears and connecting parts that transmit torque from the motor to the tool. The attachment may provide various features, such as hole diameter, length, angle, etc., to allow selection of the tool to be operated by the motor. In addition, the attachment assembly may include stiffness modifications and / or damping features, such as damping members, thickness, etc., to minimize and / or reduce vibrations caused by the tool at the tool tip and perceived and received by the user.

[0009] Further areas of applicability will become apparent from the description provided herein.The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present invention.

[0011] Figure 1 is a perspective view of an instrument assembly according to various embodiments;

[0012] Figure 1A is a perspective view of an angled attachment assembly;

[0013] Figure 2 is a plan view of an attachment assembly according to various embodiments;

[0014] Figure 3A It is taken along route 3A-3A Figure 2 a cross-sectional view of the attachment assembly shown;

[0015] Figure 3B It is taken along route 3A-3A Figure 2 a cross-sectional view of the illustrated alternative attachment assembly;

[0016] Figure 3C It is taken along route 3A-3A Figure 2 a cross-sectional view of the illustrated alternative attachment assembly;

[0017] Figure 4 is an exploded view of the attachment assembly shown in FIG3 ;

[0018] Figure 5 is a cross-sectional view of an attachment tube along a longitudinal axis of the attachment tube according to various embodiments; and

[0019] Figure 6 is a cross-sectional view of an attachment assembly according to various embodiments. Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings. DETAILED DESCRIPTION

[0020] Example embodiments will now be described more fully with reference to the accompanying drawings.

[0021] First refer to Figure 1 and 2 , showing an instrument assembly 10. The instrument assembly 10 may be similar to an instrument assembly for removing tissue, such as sold by Medtronic M4Microdebrider powered handpiece or Midas Legend EHS A high-speed surgical drill that can be selectively used in ear, nose and throat (ENT) or neurosurgery. The instrument assembly 10 may include a motor housing 16 extending along a long axis and may have various angled or ergonomically shaped portions. The housing 16 may house a motor 17 and have a chuck assembly 18. The chuck 18 may house various portions, such as gears and connections to the motor within the motor housing 16 and have a tool head 20. The tool head 20 may include a working end 22 and a shaft 24. The working end 22 may include a bone drill, a drill bit, a bone resection drill, or other suitable working end. However, the motor 17 may transmit torque to the working end 22 through the shaft 24 via an interconnection within the chuck 18.

[0022] The instrument assembly 10 may also include an attachment base 30 (also referred to as an attachment housing) and an attachment tube 34. The attachment tube 34 may be interconnected with the attachment base 30, as discussed further herein. The attachment tube 34 may form a hole 42, and both the attachment tube 34 and the hole 42 may extend from the first end 35 to the second end 37.

[0023] The attachment base 30 and the attachment tube 34 can be operably removed from the clamp 18 during a selected procedure. For example, the attachment base 30 and the attachment tube 34 can form an attachment assembly 40 that can include various features, such as a selected size of a hole 42 that can extend through at least a portion of the attachment tube 34 and a geometry of the attachment tube 34. For example, the attachment tube 34 can be configured as an attachment tube 34', such as Figure 1A As shown, the attachment tube 34 includes a first tube portion 34a extending along a first axis A and a second tube portion 34b extending along a second axis B, wherein the axes A and B are angled relative to each other. The angle between the axis A and the axis B can be selected based on the selected surgery, and a movable interconnection can also be included to provide power from the motor 16 to the tool 20 through the angled area. The angle can also be formed by connecting the attachment tube 34 to an attachment base having an angle. For example, the gear and the connection portion can be arranged in the attachment base between the proximal end and the connection end 50. Therefore, an angle can be provided between the working end 22 of the tool 20 and the chuck 18 without an angled tube 34'. However, the attachment assembly 40 can be removed from the chuck assembly 18 to selectively select an attachment that may include different features, such as the length of the attachment tube 34, the angle of the attachment tube (including the angle of the attachment tube 34'), the angle of the attachment base 30, and other features.

[0024] The attachment assembly 40 may include an interconnection between the attachment tube 34 and the attachment housing 30. Figure 3A As shown, the attachment tube 34 may be formed as a separate component from the attachment housing 30. The attachment tube 34 may then be selectively coupled to the attachment housing 30 using a variety of connection mechanisms.

[0025] Continue to refer to Figure 3A And refer to Figure 3B , 3C 4, the attachment assembly 40 will be discussed in more detail. The attachment assembly 40 includes an attachment tube 34 engaged within the attachment base 30. The attachment tube 34 may generally include a cylindrical exterior. In addition, the inner hole 42 may be formed by an inner annular wall. As discussed herein, various features may be formed in the annular wall to change the diameter of the hole 42 at selected areas.

[0026] The attachment tube 34 can include a connection area 50 received within an attachment base receiving section 52. The connection area 50 can be formed at or near the first end 37. In various embodiments, the connection area 50 can be formed at the first end 35 and extend toward the second end 37. The tube connection area 50 can extend a length 54 and include an outer diameter 56. The attachment portion 50 can be received within the receiving section 52 for coupling the attachment tube 34 to the attachment base 30.

[0027] As discussed herein, the tube connection region 50 may have external threads to engage internal threads in the receiving section 52. However, it should be understood that other coupling mechanisms may be provided, for example, the attachment tube 34 may be connected to the attachment base 30 using at least one of a press fit, brazing, welding, threading, adhesives, riveting, or other suitable connection. Furthermore, in various embodiments, the attachment tube 34 may be directly and indirectly coupled to the attachment base 30 ( Figure 3A ), may only be indirectly coupled to the attachment base 30 ( Figure 3B ), or may simply be coupled directly to the attachment base 30 ( Figure 3C ), as discussed herein.

[0028] The attachment section 52 of the attachment base 30 may include a first inner diameter 58 that may be larger than the outer diameter 56 to receive an intermediate or damping member 70 (also located at Figure 4 ). The receiving section 52 may also include a second inner diameter 60 that may be substantially equal to or slightly larger than the outer diameter 56 of the tube connection section 50. The relationship of the inner diameter 58 and the outer diameter 56 of the damping member 70 may allow or form a press-fit connection between the damping member 70 and the attachment base 30. Thus, when assembled, the connection area 50 of the attachment tube 34 may be generally concentric with the attachment area 52 of the attachment base 30.

[0029] The tool 20 can rotate about the axis 20a. The rotation can be caused by the torque transmitted to the tool 20 from the motor 17 in the motor assembly 16. The chatter can be caused by the movement of the tool 20 and / or the instrument assembly 10 perpendicular to the axis 20a (e.g., in the direction of the double-headed arrow 55). However, it should be understood that the rotation of the tool 20 can cause vibrations in any lateral direction relative to the axis 20a. Operating the tool 20 at a selected rotational speed can also reduce vibrations, such as lateral movement of the tool 20 and / or the accessory assembly 40 away from the axis 20a.

[0030] like Figure 3A As shown, the connection area 50 of the attachment tube 34 can extend to the direct bonding area 62 to allow the attachment tube 34 to be directly connected to the attachment base 30. For example, in the direct bonding area 62, the external threads on the tube connection section 50 can engage the internal threads formed on the inner diameter 60 of the connection area 52 at the direct bonding area 62. The attachment tube 34 can then be threadedly connected to the attachment base 30 to allow the attachment tube 34 to be directly connected to the attachment base 30. However, it should be understood that other connections and bonding of the attachment tube 34 to the base 30 can be made. For example, a selected adhesive material, a press fit, and other connections can be formed between the attachment tube 34 and the attachment base 30.

[0031] Reference Figure 3B , it should be understood that the attachment tube 34 need not be directly connected to the attachment base 30. Instead, the attachment assembly 40x may have an attachment tube 34x. The attachment tube 34x may be substantially similar to the attachment tube 34 described above. The attachment tube may have a connection portion 50 that may only contact the damping member 70 within the attachment base 30. Thus, the attachment tube 34 may be interconnected with the attachment base 30 via the damping member 70 and not directly contact the attachment base 30 at least within the connection area 52. However, the attachment tube 34 may contact the outer surface 53 of the attachment base 30.

[0032] like Figure 3C As shown, the attachment tube 34 only needs to directly contact and connect to the attachment base 30. Simply connecting the attachment tube directly to the attachment base 34 may be an optional alternative to including the damping member 70. The attachment assembly 40y may have an attachment tube 34y. The attachment tube 34y may be substantially similar to the attachment tube 34 described above. The attachment tube 34y may have a connection portion 50, which may only contact the attachment base 30, including at the outer surface 53 and the direct bonding area 62. Therefore, if the inner diameter 58 is maintained, a gap 71 may be formed. However, it should be understood that the connection area 52 may only include the inner diameter 60, so that there is no gap 71.

[0033] Continue to refer to Figure 1-3C And refer to Figure 4, the damping member 70 may extend a length 72 between an outer or distal end 74, which may include a lip or edge 76, and a proximal end 78. The damping member 70 may be generally cylindrical and have a substantially annular wall forming an outer diameter 82 and an inner diameter 84. The outer diameter 82 may be substantially equal to or slightly less than the inner diameter 58 of the base connection area 52. Thus, the damping member 70 may be press-fit and retained in the connection area 52. However, it should also be understood that the damping member 70 may be coupled to the attachment base 30 via an adhesive, a threaded connection, or other suitable connection. The inner diameter 84 may be formed to receive the connection area 50 and may be substantially equal to or equal to the inner diameter 60 of the connection area 52.

[0034] It should also be understood that according to various embodiments, the damping member 70 can be molded or formed on the attachment base 30, the attachment tube 34, or both. For example, the damping member 70 can be injection molded into the connection portion 50 of the attachment tube 34 or the connection portion 52 of the attachment base 30. Thus, the connection of the damping member 70 can be made relative to the attachment assembly 40 in a selected manner.

[0035] The damping member 70 may also have a thickness (formed by the difference between the inner diameter 84 and the outer diameter 82), a length 72, a material, or other features selected based on the operating parameters of the attachment assembly 40. The operating parameters may include the rotational speed of the tool 20, the length of the attachment tube 34, the angle of the attachment tube 34', the diameter of the shaft 24, etc. In addition, the damping member 70 may be selected to have a relatively high power dissipation factor (i.e., the ability to absorb kinetic energy and / or convert kinetic energy into another form of energy), but also a material suitable for the selected surgery. For example, a viscoelastic polymer can provide a selected power dissipation factor while being able to withstand repeated heat and steam sterilization and / or chemical sterilization for surgical procedures on human patients. The damping member 70 may be formed, for example, from an elastomer, silicone rubber, FKM (determined by ASTM D1418) or a similar fluoroelastomer, chlorobutyl elastomer, or other polymer or elastomeric material. An example includes the 1000-0. ... Fluoropolymer elastomer.

[0036] As discussed above, in various embodiments, the tube connection area 50 can thus fit within the inner diameter 84 of the damping member 70 and be placed within the connection area 52 of the attachment base 30. According to various embodiments, as discussed above, the tube connection area 50 may extend no further than the length 72 of the damping member 70. However, it should be understood that the attachment tube 34 may be directly and exclusively connected to the attachment base 30.

[0037] Damping member 70 may include the various characteristics discussed above to tune vibrations of instrument assembly 70, such as vibrations at the portion held by the user at base (30) or motor housing (16), and chatter at tool tip 22. Damping member 70 may be tuned to dampen vibrations and / or chatter by a selected amount by selecting thickness, length, material, location, etc. Reduced vibration and chatter may ensure precise resection or operation of assembly 10.

[0038] The tuned vibration may occur without or in addition to the damping member 70 and the characteristics of the damping member 70. For example, the attachment area 50 of the attachment tube 34 may include a selected wall thickness 90 to help reduce vibration during operation of the tool 20. Figure 3A , 3B As shown in FIGS. 3C and 3C , the tube connection region 50 may include a wall thickness 90 that may be selected based on various characteristics and limitations of the system. The thickness 90 of the connection region 50 may be formed by increasing the inner diameter of the attachment tube 34 over a selected portion of its length. For example, Figure 3A , 3B 3C, the thickness 90 is formed by an inner diameter 92 in a first portion of the attachment tube, while an inner diameter 94 is formed in a second portion of the attachment tube 34. The attachment tube 34 may include other inner diameters, such as a distal inner diameter 95, where the tool 20 extends from the attachment tube 34 near the working end 22 of the tool 20. It should be understood that the attachment tube 34 may be coupled to the attachment base 30 without the damping member 70. Therefore, the selected two inner diameters 92 and 94 that form the thickness may provide vibration damping characteristics alone.

[0039] Thus, the reduction in vibration may be produced using one or more of a selected thickness, an axial length of an area having a selected thickness, a damping member, etc. The selected vibration design limits may be selected to be produced by reducing or forming a selected thickness at a selected location, including reducing vibration using a selected feature. The reduced or formed thickness may be achieved by cutting or forming an inner diameter or cutting into the outer surface of the attachment tube 34.

[0040] As briefly discussed above, during operation, the tool 20 may rotate about the axis 20a in a selected direction and may oscillate. During the rotation and oscillation of the tool 20, vibrations may be induced in the attachment assembly 40. The vibrations may be caused by the rotation of the tool 20 or the operation of the motor in the motor housing or motor assembly 16. The vibrations may be reduced by one or both (i.e., a combination) of the thickness 90 of the attachment tube 34 and the damping member 70. As described above, the reduction of vibrations and chatter may be achieved by forming a selected thickness 90 at any appropriate axial position along the attachment tube 34. The tool shaft 24 may ride in one or more bearings 100 connected within the inner diameter 94 of the attachment tube 34. Therefore, the rotation of the tool 20 may be radially guided by the attachment tube 34. This may transmit vibrations to the attachment housing 30, the attachment tube 34, and may be transmitted to the motor 16 or other parts grasped by the user.

[0041] Thus, the attachment tube 34 includes a selected thickness 90 and can be tuned relative to the operation of the tool 20 and the geometry and configuration of the attachment tube 34 and / or the attachment base 30. For example, when determining the selected thickness 90 of the attachment tube 34, the inner diameter 94 of the hole 33 extending through the attachment tube, the length of the attachment tube 34, the geometry of the attachment base 30, and the geometry of the attachment tube 34 such as the angle attachment tube 34' can all be considered. In addition, dimensions including thickness, such as the difference between the inner diameter 84 and the outer diameter 82 of the damping member 70, can be selected to tune the vibration reduction of the attachment assembly 40 and / or the tool assembly 10. The tuning of vibrations felt by a user such as a surgeon and the tuning of chatter (i.e., lateral movement of the tool head 22) can be based on various features, as discussed herein. In addition, the details of the features (including size, placement, etc.) can be based on the details of the selected attachment assembly. As discussed above, various attachment assemblies can be provided in various configurations so that the details of the tuning features can vary between attachment assemblies. Thus, it will be appreciated that tuning, such as selecting the amount of vibration and chatter cancellation, may vary based on a number of considerations. Figure 5 As shown, the attachment tube 34" may include a selected thickness as a vibration dampening or tuning feature away from the end including the first end 35. For example, the attachment tube 34" may include an inner diameter along substantially the entire length of the attachment tube 34". However, the vibration dampening or tuning feature 120 may be formed as a notch or groove within or outside the attachment tube 34 to form at least one area having an inner diameter 122. The inner diameter 122 provides a selected thickness relative to the outer diameter of the attachment tube 34". The vibration dampening feature 120 may include a complete annular groove, or may include a strut or connection formed therein.

[0042] In addition, the vibration damping feature 120 may provide selected flexibility at selected locations along the length of the attachment tube 34" to help reduce or eliminate selected vibrations during operation of the tool head 20. For example, the vibration damping feature may have a length 120a. The vibration damping feature 120 may have a first end 120' spaced a distance 120b from the end 35 and a second end 120" spaced a distance 120c from the second end 120c. The selected lengths 120a, 120b, and 120c may help tune the damping characteristics and may be selected based on the characteristics of the tube 34" and / or the tool 20 and / or the attachment base 30. In addition, the relationship of the inner diameters 122 and 94 may be further selected to tune the amount of damping. The inner diameters 122 and 94 and sections having them may also be selectively placed along the lengths of the attachment tubes 34, 34', and 34".

[0043] As discussed above, the bearing 100 may be positioned within the attachment tube 34″, and the operation of rotating the tool 20 about the axis 20a may induce vibrations in the attachment assembly 40. The vibration damping feature 120 including an inner diameter 122 relative to the inner diameter 94 of the attachment tube 34″ may provide selected vibration reduction. The attachment tube 34″ may be substantially similar to Figure 3A , 3B 3C , or directly connected to the attachment base 30 , or interconnected only through the damping member 70 , or a combination of interconnected to the damping member 70 and directly attached to the attachment base 30 .

[0044] Therefore, it should be understood that the attachment tube 34 can be formed alone or in combination with the damping member 70 to include, for example, Figure 5 The vibration reduction or tuning feature 120 shown or Figure 3A , 3B 3C. The vibration damping feature can help tune vibrations, which can include minimizing or eliminating vibrations caused by operation of the instrument assembly 10 to rotate the tool 20 about the axis 20a. By reducing vibrations, unselected movement of the instrument can be reduced, and operation of the tool 20 can be smoother. This can enable substantially precise operation of the tool 20, particularly over extended periods of time, to achieve selected operating speeds and patient outcomes. Reducing vibrations can also reduce user fatigue.

[0045] Reference Figure 6 , an attachment assembly 240 is shown. The attachment assembly 240 is similar to the attachment assembly 40, as discussed above. Figure 6The attachment assembly 240 shown in FIG. 1 is understood to include a hole that may include an inner diameter 92 and a second, different inner diameter 94. In addition, the attachment assembly 240 may include an attachment base 30 as discussed above and an attachment tube 234 connected to the attachment base 30 in at least one of a variety of ways. The attachment tube 234 may: (1) be directly connected to the attachment base 30 only, (2) be connected to the damping member ( Figure 6 (not shown) interconnected, or (3) connected to the damping member and the attachment base 30 ( Figure 6 The attachment assembly 240 may also include a connection portion 52 to which the base 30 is attached and a connection portion 50 to which the tube 234 is attached.

[0046] The attachment tube 234 may include various interconnected portions, such as a damping member 260 interconnecting a first rigid member 264 and a second rigid member 266. The rigid members 264, 266 may include selected outer dimensions, including those discussed above, and also include inner diameters 92 and / or 94. In addition, the damping member 260 may also define an inner diameter 94. However, it should be understood that the damping member 260 may have a selected axial position, mass, length, density, inner diameter, etc. on the attachment tube 234, as discussed above. In addition, the damping member 260 may be formed of various materials, including the materials discussed above.

[0047] The attachment tube 234 may be connected to the attachment base 30 as discussed above. However, the damping member 260 may be included as a feature of the attachment tube 234 or between a portion of the attachment tube 234 and the attachment base 30. Figure 6 As shown, the attachment base 30 may be connected to the first rigid portion 264, and the damping member 260 may be positioned between a portion of the attachment tube 234 (including the second rigid portion 266) and the attachment base 30. Therefore, the damping member 260 is positioned between at least a portion of the attachment tube 234 (i.e., the second rigid member 266) and the attachment base 30. In various configurations, those skilled in the art may consider the first rigid portion 264, a portion of the attachment base 30 when connected to the attachment base 30. However, it should be understood that another damping member, such as the damping member 70, may be generally positioned near the connection portion and the regions 50, 52, such as in the gap 71. Therefore, it should also be understood that according to various embodiments, the attachment assembly 240 may include a plurality of damping members. As Figure 6 As particularly shown in FIG. 2 , the damping member 260 is positioned a distance from the distal end 53 of the attachment base 30 and is fully integrated into the attachment tube 234 .

[0048] The damping member 260 can be connected to the rigid members 264, 266 according to various suitable bonding techniques. For example, the damping member 260 can be adhered, welded, molded directly to the rigid members 264, 266, or other suitable bonding or fixing techniques. However, the damping member 260 can dampen the movement between the second rigid member 266 and the first rigid member 264 and the attachment base 30. Therefore, the damping member 260, including the various features of the damping member 260, can be used to help tune the chatter and vibration of the instrument 10, as discussed above.

[0049] As described above, the vibration dampening features may be individually or collectively tuned to a particular configuration of the tool assembly 10. For example, the configuration of the tool assembly may include the size of the bore, the length of the attachment tube 34, the angle of the attachment tube 34', etc. The tuning features may include selecting the thickness 90 of the wall, the length of the region having the thickness 90, the axial position of the wall having the thickness 90, the thickness and / or length or axial positioning of the damping member 70, and / or the axial position, length, or relative inner diameter of the damping feature 120.

[0050] The vibration response and associated reduction (e.g., by an increase in damping or reinforcement or a decrease in reinforcement) of the tool 20 and attachment assembly 40 can be modeled by one or more structural dynamic techniques. Modeling techniques may include modal analysis, harmonic analysis, or transient dynamic analysis. Additionally or alternatively, various physical testing techniques may be employed to determine the vibration response. These methods can predict the frequencies and displacements involved where the technique is appropriate.

[0051] These exemplary embodiments are provided so that the present disclosure is thorough to those skilled in the art and fully demonstrate the scope of the present disclosure. Many specific details such as examples of specific components, devices and methods are set forth to provide a thorough understanding of the embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that exemplary embodiments may be embodied in many different forms, and that none should be construed as limiting the scope of the present disclosure. In certain exemplary embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.

[0052] The foregoing description of the embodiments has been provided for the purpose of illustration and description. It is not intended to be exclusive or to limit the present disclosure. The individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but are interchangeable where applicable and can be used in selected embodiments, even if they are not specifically shown or described. It can also be modified in many ways. Such variations should not be considered as violations of the present disclosure, and all such modifications are intended to be included within the scope of the present disclosure.

Claims

1. An assembly for holding a tool, comprising: an attachment base configured to be operably coupled to the motor housing assembly and having an attachment base receiving section; an attachment tube extending from a first end to a second end, the attachment tube having a connection region at the first end that is received within the attachment base receiving section, the connection region having a first inner diameter extending along the attachment base receiving section and a second inner diameter extending from the end of the attachment base receiving section, the first inner diameter being greater than the second inner diameter; as well as a damping member positioned between the attachment base and at least a portion of the attachment tube; wherein the tool is configured to extend through the attachment base and the attachment tube, and torque is transmitted from the motor within the motor housing assembly to the tool; wherein the attachment tube is coupled to the attachment base at the first end; wherein the second end of the attachment tube extends from the attachment base; Wherein the first inner diameter and the second inner diameter provide a vibration dampening feature.

2. The assembly according to claim 1, wherein The attachment tube includes a tube attachment section at the first end, wherein the tube attachment section includes a wall thickness selected to cooperate with the damping member to reduce vibrations felt at the motor housing assembly relative to vibrations caused by movement of a cutting tool.

3. The assembly according to claim 2, wherein: the attachment tube forming a bore extending from the first end to the second end; wherein the attachment tube has a first inner diameter near the first end; wherein the attachment tube has a second inner diameter near the second end; Wherein, the first inner diameter is greater than the second inner diameter, so that the wall thickness is at least partially formed by the first inner diameter.

4. The assembly according to claim 2, wherein: The attachment tube is directly coupled to the attachment base at a first portion of the tube attachment section and directly contacts the damping member at a second portion of the tube attachment section between the attachment tube and the attachment base.

5. The assembly according to claim 1, wherein: The attachment tube is only directly coupled to the damping member.

6. The assembly according to claim 5, wherein: The damping member is directly coupled to both the attachment tube and the attachment base.

7. The assembly of claim 1, further comprising: the tool extending through the attachment base and the attachment tube, wherein vibration of the tool is reduced by at least the damping member; and The motor housing assembly houses the motor, wherein the tool is operably connected to the motor.

8. A method of forming an assembly for holding a tool, comprising: inserting a first length of a first end of the attachment tube into the tube connection hole of the attachment base; securing the attachment tube to the attachment base; wherein the attachment tube includes a vibration dampening feature located between a first end and a second end of the attachment tube; Wherein, the vibration reduction feature includes forming a first inner diameter, which is larger than a second inner diameter, the first inner diameter is used for a first section length of the attachment tube inserted into the attachment base, and the second inner diameter is on a second section length starting from the end of the attachment base that receives the attachment tube.

9. The method according to claim 8, further comprising: A damping member is placed within the tube connection hole between an outer wall of the attachment tube and an inner wall of the attachment base.

10. The method according to claim 9, further comprising: The damping member is formed from an elastomeric material.

11. The method according to claim 10, wherein: The elastomeric material is silicone rubber, fluoroelastomer, chlorobutyl elastomer or FKM as determined by ASTM D1418.

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