阅读说明：本技术 用于数字耳镜的一次性窥器 (Disposable speculum for digital otoscope ) 是由 詹姆斯·贝尔比 格雷格·雷贝拉 阿齐塔·哈姆达尼 帕特里克·阿耶列 托马斯·哈奇森四世 拉 于 2020-02-12 设计创作，主要内容包括：一种用于耳镜的一次性窥器,该一次性窥器提供了护套,该护套适于覆盖长型的耳镜探针并提供向内延伸的突片,所述突片适于在窥器插到耳镜上时向外弯曲以接合耳镜的对应凹槽。向内延伸的突片提供窥器与长型的耳镜探针沿着插入轴线的精确对准以保护探针的长度。(A disposable speculum for an otoscope provides a sheath adapted to cover an elongated otoscope probe and provide inwardly extending tabs adapted to flex outwardly to engage corresponding grooves of the otoscope when the speculum is inserted over the otoscope. Inwardly extending tabs provide precise alignment of the speculum with the elongated otoscope probe along the insertion axis to protect the length of the probe.)

1. A disposable speculum for an otoscope, comprising:

a funnel-shaped sheath having a central bore sized to receive an elongated cylindrical probe element of the otoscope therein along an axis, and having:

a distal end sized to fit within an ear canal, an

A proximal end providing radially inwardly extending teeth that are outwardly bendable to allow the inwardly extending teeth to releasably engage corresponding grooves of the probe element of the elongated body of the otoscope by outward movement of the teeth.

2. The speculum of claim 1, wherein an axial notch is provided laterally of the tooth to enable the portion of the proximal end that retains the tooth to flex outwardly.

3. The speculum of claim 1, wherein the teeth have a front face facing the distal end, and the front face extends inwardly perpendicular to the axis or is angled toward the distal end as the teeth travel inwardly along the front face.

4. The speculum of claim 1, wherein three teeth are equally spaced at 120 ° about the axis.

5. The speculum of claim 1, wherein the circumferentially opposite ends of the teeth are provided with at least one wall that slopes inwardly as the teeth travel radially inwardly along the teeth.

6. The speculum of claim 2, wherein the proximal end provides a rounded rim and the axial slot extends through the rim.

7. The speculum of the claim 1, wherein the proximal end includes a cylindrical portion that abuts and supports the cylindrical probe element.

8. The speculum of claim 7, further comprising a tapered portion in addition to the cylindrical portion.

9. The speculum of claim 1, further comprising radially outwardly extending fins rotationally aligned with the teeth.

10. The speculum of the claim 1, wherein the sheath is a thermoplastic material.

11. The speculum of the claim 1, wherein the sheath is light absorbing.

12. The speculum of claim 1, further comprising

An otoscope housing adapted to be supported by a hand of a healthcare professional, wherein the housing is in an examination position proximate an outer ear of a patient,

wherein the elongate cylindrical probe element has a proximal end supported by the housing such that a distal end of the elongate probe element is extendable into the ear canal along the axis; and

an otoscope electronic camera supported by the elongate cylindrical probe element's distal end for viewing the ear canal when the distal end of the probe element is positioned in the ear canal of the outer ear.

13. The speculum of claim 12, wherein the corresponding grooves are radially spaced at 120 ° about the axis.

14. The speculum of claim 12, wherein the corresponding groove comprises a ramped surface.

15. The speculum of claim 12, wherein the corresponding groove comprises a front vertical face.

16. The speculum of claim 12, wherein the distance between the distal end of the sheath and the distal end of the elongate probe element is about 1mm to 2 mm.

17. A method of using a disposable speculum for an otoscope, comprising the steps of:

providing a funnel-shaped sheath having a central bore sized to receive an elongate cylindrical probe element of the otoscope therein along an axis, and having:

a distal end sized to fit within an ear canal, an

A proximal end provided with radially inwardly extending teeth that are outwardly bendable such that the inwardly extending teeth can releasably engage corresponding grooves of the probe element of the elongated form of the otoscope by outward movement of the teeth; and inserting the sheath into the ear canal.

18. The method of claim 17, wherein an axial notch is provided laterally of the tooth to enable the portion of the proximal end that retains the tooth to flex outwardly.

Background

The present invention relates to a speculum for an otoscope, and more particularly to a speculum that is insertable into an ear canal and surrounds an electronic camera of the otoscope extending along an axis of the speculum to retrieve an image of the ear canal.

Otoscopes are medical devices that allow a health care professional to examine the ear canal and tympanic membrane (ear drum). A simple otoscope is provided with a hollow funnel-shaped speculum, the smaller end of which is inserted into the ear canal. The purpose of the funnel shape of the speculum is to provide a visual path to the tympanic membrane and to help control the depth of insertion of the speculum. The speculum also provides a clean barrier between the otoscope and the patient.

Modern otoscopes include an internal illumination source directed along the axis of the speculum from a contained battery-powered lamp, and may provide a magnifying lens supported outside the ear and aligned with the axis of the speculum to provide a magnified image of the structure of the ear being viewed. The speculum may desirably be disposable and typically includes a threaded attachment provided by a short helical groove that attaches to the receiving portion of the otoscope.

More recently, otoscopes have incorporated digital cameras directly on the otoscope with a display to view the camera images. Examples of such otoscopes can be found in U.S. patent 9,326,668, U.S. patent publication 2016/0374546, and U.S. patent publication 2018/0125345, each of which is hereby incorporated by reference, which are assigned to the present applicant. In such an otoscope, a digital camera may be positioned at the tip of a probe inserted into the ear.

Disclosure of Invention

The present inventors have recognized that conventional helical groove threads for attaching a disposable speculum to an otoscope may not be optimal for a digital otoscope in which the axial tip of the speculum must be precisely positioned to protect the camera head without unduly limiting its field of view. The screw engagement of the thread system may also hinder the use of a probe or tool attached to the speculum in cases where precise rotational position and torque resistance are important.

The present invention provides a disposable speculum for an otoscope, the speculum providing a sheath adapted to cover an elongated otoscope probe and provided with inwardly extending tabs adapted to flex outwardly to releasably engage corresponding grooves of the otoscope when the speculum is inserted over the otoscope.

In particular, then, in one embodiment, the invention provides a disposable speculum for an otoscope, the speculum comprising a funnel-shaped sheath having a central bore dimensioned to receive an elongate cylindrical probe element of the otoscope therein along an axis and having a distal end dimensioned to fit within an ear canal and a proximal end providing radially inwardly extending teeth that are outwardly bendable to allow the inwardly extending teeth to releasably engage corresponding grooves of the elongate probe element of the otoscope by outward movement of the teeth.

It is therefore a feature of at least one embodiment of the invention to provide an attachment mechanism that facilitates precise rotational positioning and axial extension of the axial tip of a speculum to protect an axially extending camera therein. The snap on attachment mechanism provides an intuitive feel of rotational positioning, as compared to a screw-type speculum where rotational position may be important, such as where the speculum includes a scraper tool.

Axial notches are provided on the sides of the teeth to allow the portion of the proximal end that retains the teeth to flex outwardly.

It is therefore a feature of at least one embodiment of the invention to provide an engagement mechanism that does not require rotation of the speculum during attachment.

The teeth may have front faces facing the distal end and these front faces extend inwardly perpendicular to the axis or slope toward the distal end as the teeth travel inwardly along the front faces.

It is therefore a feature of at least one embodiment of the invention to provide a tooth that resists axial displacement after the tooth engages a corresponding recess.

The three teeth may be equally spaced about the axis at 120 °.

It is therefore a feature of at least one embodiment of the invention to provide an attachment mechanism that better resists two-dimensional torsion across the insertion axis and perpendicular to the probe axis.

The circumferentially opposite ends of the teeth may provide at least one wall that slopes inwardly as the teeth travel radially inwardly along the teeth.

It is therefore a feature of at least one embodiment of the invention that the contact pressure between the teeth and the inclined walls of the recess of the otoscope is reduced when the speculum is rotated for release and disposal.

The proximal end may provide a rounded rim and the axial slot extends through the rim.

It is therefore a feature of at least one embodiment of the invention to provide good outward flexibility of the teeth using simple injection molding techniques.

The proximal end may include a cylindrical portion that abuts and supports a cylindrical probe element. The speculum may comprise a tapered portion in addition to the cylindrical portion.

It is therefore a feature of at least one embodiment of the invention to maximize camera support while reducing the tip width required for insertion into the inner ear.

The speculum may further comprise radially outwardly extending fins rotationally aligned with the teeth.

It is therefore a feature of at least one embodiment of the invention to apply a rotational force directly over the teeth to improve the release of the teeth during rotation of the speculum and to provide a controlled bending stiffness independent of the thickness of the speculum wall.

The jacket may be a thermoplastic material.

It is therefore a feature of at least one embodiment of the invention to provide a speculum which is easy to manufacture and therefore can be used once, inexpensively, to improve safety.

The sheath may be light absorbing.

It is therefore a feature of at least one embodiment of the invention to prevent unwanted leakage of light into the sheath that may affect the camera image.

The sheath may further comprise an otoscope housing adapted to be supported by a hand of a healthcare professional, the housing being in an examination position near the outer ear of the patient, wherein the elongate cylindrical probe element has a proximal end supported by the housing such that a distal end of the elongate cylindrical probe element may extend along the axis into the ear canal; and an otoscopic electronic camera supported by the distal end of the elongated cylindrical probe element for viewing the ear canal when the distal end of the elongated cylindrical probe element is positioned in the ear canal of the concha.

It is therefore a feature of at least one embodiment of the invention to mount the speculum on an otoscope that is intended to extend the tip of the camera head into the ear canal.

The corresponding grooves may be radially spaced at 120 ° about the axis.

It is therefore a feature of at least one embodiment of the invention that the teeth are aligned with the grooves by a slight (less than a quarter turn) rotation of the speculum.

The corresponding groove may comprise a ramp surface.

It is therefore a feature of at least one embodiment of the invention to allow the detachment of the speculum by rotating the speculum and then separating the speculum and the otoscope along the axis.

The corresponding recess may include a front vertical face.

It is therefore a feature of at least one embodiment of the invention to provide an abutment of the tooth against the front face of the groove to prevent displacement of the speculum.

The distance between the distal end of the sheath and the distal end of the elongate probe element may be about 1mm to 2 mm.

It is therefore a feature of at least one embodiment of the invention to provide a fixed axial alignment of a speculum extending over a fragile axially extending camera head.

In an alternative embodiment, the present invention provides a method of using a disposable speculum for an otoscope, the method comprising the steps of: providing a funnel-shaped sheath having a central bore sized to receive an elongate cylindrical probe element of an otoscope therein along an axis, a distal end sized to fit within an ear canal, and a proximal end providing radially inwardly extending teeth that are outwardly bendable to allow the inwardly extending teeth to releasably engage corresponding grooves of the elongate probe element of the otoscope by outward movement of the teeth; and the sheath is inserted into the ear canal.

These particular objects and advantages may apply to only some embodiments falling within the scope of the claims and therefore do not define the scope of the invention.

Drawings

FIG. 1 is a side view of a disposable speculum constructed in accordance with the present invention inserted onto an otoscope along an insertion axis;

FIG. 2 is a perspective view of the exterior of the disposable speculum of FIG. 1 providing a sheath presenting a curved collar tapering towards a cylindrical tube;

FIG. 3 is a perspective view of the interior of the disposable speculum of FIG. 2 showing the plurality of teeth as the bending collar is bent outward;

FIG. 4 is a cross-sectional view through the speculum and assembled otoscope of FIG. 1 along a vertical plane taken along line 4-4 of FIG. 1;

FIG. 5 is an enlarged cross-sectional view similar to FIG. 4 showing the tooth with substantially vertical side walls received into the recess of the otoscope; and

FIG. 6 is an enlarged sectional view taken along the vertical plane along line 6-6 of FIG. 4, which is perpendicular to the insertion axis of the otoscope and shows the tooth with at least one angled sidewall received into the recess of the otoscope.

Detailed Description

Referring first to fig. 1, the removable speculum 10 of the present invention may provide a protective sheath 12 that fits over a cylindrical probe 14 of an otoscope 16 that extends along an insertion axis 20 that is aligned with the ear canal when the otoscope 16 is in use. Otoscope 16 may support a forward facing electronic camera 18 on its probe distal tip 17, the electronic camera 18 for acquiring multi-pixel, three-color images in a field of view oriented along a speculum axis 22. Otoscopes 16 suitable for use with the present invention are described in U.S. patent 9,326,668, U.S. patent publication 2016/0374546, and U.S. patent publication 2018/0125345, each of which is incorporated herein by reference.

As described further below, the removable speculum 10 is attached to the otoscope 16 by a snap-lock engagement between the protective sheath 12 and the otoscope 16 supporting the cylindrical probe 14 and the electronic camera 18.

Referring now to fig. 2, the protective sheath 12 of the removable speculum 10 may be in the form of a hollow horn with a central bore extending along the speculum axis 22 and surrounded by the outer sheath 12. The outer sheath 12 is substantially radially symmetrical with a rotation angle of 120 degrees and the amount of eversion gradually increases along the speculum axis 22 as the sheath 12 flares up from the speculum distal tip 11 to the rounded proximal outer rim 13 attached to the otoscope 16. The outer diameter of the outer sheath 12 may gradually increase from about 2-3mm at the distal tip 11 of the speculum to about 18-19mm at the proximal outer edge 13, or gradually increase by 6 to 10 times its smallest diameter.

The outer jacket 12 may be constructed from a non-elastic thermoplastic by injection molding. The rigid material of the protective sheath 12 allows the speculum 10 to easily slide over the cylindrical probe 14 without resistance as might be expected, for example, if the material is an elastomer. The rigid material of the protective sheath 12 also serves to support and protect the cylindrical probe 14 and electronic camera 18, which are relatively susceptible to damage. The speculum 10 may be opaque and may be light absorbing, such as black in color, to minimize light leakage into the sheath 12.

The distal part 33 of the protective sheath 12 extending into the ear canal may provide an elongated tube 34 having a central bore extending along the speculum axis 22, the inner diameter of which bore, measured in a plane perpendicular to the speculum axis 22, is about 2-3mm and less than 3mm and ideally less than 2.3 mm. It is intended that the tube 34 be sized to have an outer diameter smaller than the ear canal so that it can be comfortably inserted into the ear canal, for example, about 2-3mm and less than 3mm and ideally less than 2.4 mm. The outer diameter of the tube 34 may be minimized to allow the tube 34 to be inserted into ear canals of smaller sizes, such as the ear canals of toddlers and infants, which may be as small as 3 to 4mm in diameter. The length of the tube 34 may be approximately 8-12mm and at least 8mm to allow the protective sheath 12 to extend through small obstructions, such as cerumen, that are normally present, but to allow the passage of the electronic camera 18 to be maintained close to the eardrum to allow imaging of the eardrum of the ear.

In certain embodiments, the tube 34 may be cylindrical with a constant inner diameter that closely matches the outer diameter of the cylindrical probe 14 for good support, although the tube 34 may also be slightly tapered over that length, e.g., toward the narrowing speculum distal tip 11.

The tube 34 opens at the distal tip 11 of the speculum to allow exposure of the held electronic camera 18 along the speculum axis 22. The distal tip 11 of the speculum may support a probe or tool, such as a spoon 31 to assist in cerumen removal. Scoop 31 extends from speculum distal tip 11 along axis 22 and is upwardly concave toward axis 22.

The proximal portion 36 of the protective sheath 12 may take the form of a funnel 37 having a central bore flaring outwardly from the tube 34 and extending to a flared integrally molded collar 38 coupled to the otoscope 16. The diameter of the distal end of the funnel 37, measured in a plane perpendicular to the speculum axis 22, may be about 2-3mm, and the diameter of the proximal end of the funnel 37, extending at least 12mm from the distal end of the funnel 37 along the speculum axis 22, may be 9-10 mm. The funnel 37 may flare outwardly toward an integrally molded collar 38 of the protective sheath 12 at about 15-20 degrees relative to the speculum axis 22 and at about 18 degrees relative to the speculum axis 22. The increased diameter of the funnel 37 compared to the narrow tube 34 may help to control the insertion depth of the speculum 10 such that the proximal end portion 36 may only extend partially into the ear canal 21 to prevent the distal tube 34 from extending too far into the ear canal 21, which would risk damaging or puncturing the eardrum.

The funnel 37 expands outwardly to a gradually flaring integrally molded collar 38, which collar 38 can be engaged over the head 24 of the otoscope 16 to secure thereto. The collar 38 may take a similar conical shape, flaring outwardly in the unflexed state at about 40-45 degrees relative to the speculum axis 22 and at about 45 degrees relative to the speculum axis 22 towards the proximal end of the protective sheath 12, providing a larger diameter bore for receiving the head 24 of the otoscope 16. The diameter of the distal end of the collar 38, measured in a plane perpendicular to the speculum axis 22, may be about 9-10mm, and the diameter of the proximal end of the collar 38, extending at least 3mm from the distal end of the collar 38 along the speculum axis 22, may be 18-19 mm.

The proximal portion 36 of the protective sheath 12 may be provided with bending sections 40 formed by axial slots 46, which axial slots 46 extend along the speculum axis 22 and divide the proximal portion 36 into cantilever sections that may be deformed outwardly and/or inwardly away from and/or towards the speculum axis 22 at the proximal edge 13 of the proximal portion 36 by a distance of about 0.1-0.5mm, and at least 0.1 mm. The longitudinally extending slot 46 may be approximately 0.5-1mm wide and at least 0.5mm wide, and may extend through the proximal rim 13 toward the distal portion 34 for a length of at least 8mm, or at least one-third of the length of the protective sheath 12.

In one embodiment, the collar 38 may include three equally spaced slots 46, the slots 46 being positioned about 120 degrees apart around the speculum axis 22 of the proximal portion 36 and forming three cantilevered segments 40a, 40b, 40c, the three cantilevered segments 40a, 40b, 40c being supported at the distal end by the protective sheath 12 and separated on the left and right sides by the slots 46 at the proximal edge 13 to allow the segments 40a, 40b, 40c to flex outwardly and/or inwardly away from and/or toward the speculum axis 22. Each of the segments 40a, 40b, 40c may be independently bendable, however, equal outward/inward forces on the segments 40a, 40b, 40c will generally result in substantially equal outward/inward bending of each segment 40a, 40b, 40 c.

The outer surface 49 of the proximal portion 36 of the protective sheath 12 may support at least one outwardly projecting fin 50 extending from the protective sheath 12. The at least one outwardly projecting fin 50 may generally span between the funnel 37 and the collar 38 to form a generally triangular tab for twisting the protective sheath 12 with the fingers by a healthcare professional without the need for additional tools. In one embodiment, the proximal end portion 36 may carry three equally spaced fins 50, the fins 50 being spaced about 120 degrees apart about the speculum axis 22 and generally radially centered between the three equally spaced slots 46.

Referring to fig. 3, the inner surface 51 of the proximal portion 36 may support at least one radially inwardly projecting tooth 52, the tooth 52 engaging the inserted head 24 of the fully mounted otoscope 16. The teeth 52 may be in the shape of an elliptical, oblong, or rectangular protrusion extending from the inner surface 51 toward the speculum axis 22 and have a generally rounded outer edge to allow the teeth 52 to slide or roll into or out of the corresponding groove 58 of the otoscope 16. The teeth 52 may be at least 1mm wide, 3mm long, and 0.1mm deep. The teeth 52 may be oriented such that the longest dimension of the teeth 52 extends along the circumference of the protective sheath 12 and the shortest dimension of the teeth 52 extends along the speculum axis 22.

Turning briefly to fig. 5 and 6, each tooth 52 may have a front face 53 facing the distal end of the protective sheath 12, the front face 53 being substantially perpendicular to the speculum axis 22 as shown (axis 22' extending parallel to axis 22), or may also be inclined toward the speculum axis 22 as the tooth moves inwardly along the front face 53, thus being oriented to abut the front wall of the groove 58 to prevent the tooth 52 from being removed from the groove 58 in a forward direction. As shown, the back face 54 of the tooth 52 may be substantially perpendicular to the speculum axis 22, or may be angled toward the speculum axis 22 as the tooth moves outward along the front face 53, and is thus oriented to abut the back wall of the groove 58 to prevent the tooth 52 from being removed from the groove 58 in a rearward direction. The sides 55, 56 of the tooth 52 may be angled away from the speculum axis 22 as the tooth moves inwardly along the front face 53, as shown, but may also be angled toward the speculum axis 22 as the tooth moves inwardly along the front face 53, or may be substantially perpendicular to the speculum axis 22, and thus oriented to assist the tooth 52 in moving along the slope of the groove 58. In one embodiment, the inner surface 51 of each segment 40a, 40b, 40c may support a single tooth 52. The teeth 52 may be generally centrally located between the three equally spaced notches 46 in each section 40a, 40b, 40c and located towards the proximal end of the funnel 37. The teeth 52 may be rotationally aligned with the outwardly extending fins 50.

Referring now to fig. 1 and 4, the removable speculum 10 may be slid over the otoscope 16, the otoscope 16 generally providing a housing having a head 24 supported by a removable grip portion 72. The gripping portion 72 is sized to be gripped by the hand of the healthcare professional in a manner that conventional otoscopes have gripping portions 72 that extend generally upward from the hand of the healthcare professional to the head 24.

The head 24 of the otoscope 16 may take the shape of a cone that tapers to a forward end defined by a rounded tip supporting the frustoconical mounting boss 74. The distal end 77 of the frusto-conical mounting boss 74 of the head portion 24 of the otoscope 16 supports an extension of the cylindrical probe 14, the cylindrical probe 14 having a proximal end 78 supported by the head portion 24 and a distal end or tip 17 extending along the axis 20 of the ear canal 21. The cylindrical probe 14 may extend for a length of about 8-10mm and at least 8mm to allow the forward facing electronic camera 18 at the probe distal tip 17 to reach a desired depth within the ear canal 21. The distal tip 17 of the cylindrical probe 14 supports an electronic camera 18, the electronic camera 18 for viewing inside the ear canal 21 and communicating with an electronic display that displays otoscopic images from the electronic camera 18, and is positioned along the axis 20 at the distal tip 17 of the cylindrical probe 14 and centered along the axis 20 as understood in the art. The electronic camera 18 may be, for example, a stand-alone charge-coupled device (CCD) camera, such as is commercially available, providing, for example, a 1.4mm diagonal measurement area and 62,500 pixels.

The outer edge of the frusto-conical mounting boss 74 may have a groove 58 disposed therein and corresponding to the teeth 52 of the removable speculum 10. The recess 58 of the otoscope 16 may be a generally rectangular hole that is approximately 1mm to 2mm wide, 3mm to 4mm long, and 0.1mm to 0.5mm deep. In one embodiment, the cylindrical mounting boss 74 may support three equally spaced grooves 58 spaced about 120 degrees apart about the axis 20, whereby the largest dimension of the rectangle extends along the circumference of the cylindrical mounting boss 74 and the shortest dimension of the rectangle extends along the axis 20.

Referring now to fig. 5, the rectangular recess 58 may provide substantially perpendicular front and rear sidewalls 80 and 82, respectively (relative to an axis 20' parallel to the axis 20) to prevent the tooth 52 from being removed from the recess 58 in the fore-aft direction along the axis 20. In this manner, the removable speculum 10 cannot be easily removed by the healthcare professional and secured to the otoscope 16 once installed.

Referring now to fig. 6, rectangular recess 58 may provide lateral sidewalls 84, 86, whereby at least one of sidewalls 84, 86 is angled to provide a ramp in which tooth 52 may slide or ride along angled sidewalls 84, 86 and become disengaged from recess 58 when removable speculum 10 is rotated in at least one of a clockwise or counterclockwise direction. The angle of at least one of the sidewalls 84, 86 may be at least 45 degrees and at least 45 degrees from vertical. It should be understood that one or both of the lateral sidewalls 84, 86 may be angled to provide an exit ramp for the teeth 52. In one embodiment, one lateral sidewall 84 is angled, while the opposite sidewall 86 extends substantially perpendicular to the bottom of the groove 58. In this regard, a twisting motion in one direction (toward the inclined side wall 84) will allow removal of the removable speculum 10 from the head 24 of the otoscope 16, while a twisting motion in the opposite direction will be prevented by the generally vertical side wall 86. In an alternative embodiment, both lateral side walls 84, 86 are angled such that twisting in either a clockwise or counterclockwise direction will allow removal of the removable speculum 10 from the head 24 of the otoscope 16.

Referring again to fig. 1, 4 and 5, the removable speculum 10 can be inserted onto the cylindrical probe 16 by sliding the speculum 10 backwards along the insertion axis 20 over the cylindrical probe 16, whereby the central hole of the tube 34 holds the cylindrical probe 14, which cylindrical probe 14 carries the forward facing electronic camera 18 at its tip 17. The segments 40a, 40b, 40c of the removable speculum 10 may be bent outwards to accommodate the head 24 when the head 24 is inserted into the speculum 10. Speculum 10 is inserted along axis 20 until collar 38 extends over boss 74 of removable speculum 10. If tooth 52 is aligned with groove 58 when inserted along axis 20, speculum 10 may not need to be rotated, but in some cases may need to be rotated slightly (less than a quarter of a turn) until tooth 52 is aligned with groove 58 and removable speculum 10 snaps into place.

Once mounted, the axial position of the distal tip 11 of the removable speculum 10 is arranged such that the distal tip 17 of the cylindrical probe 14 can terminate before the distal tip 11 of the removable speculum 10. In one embodiment, the distance between the distal tip 17 of the cylindrical probe 14 and the distal tip 11 of the removable speculum 10 may be about 1-2mm, or less than 2 mm. The distance between the distal tip 17 of the cylindrical probe 14 and the distal tip 11 of the removable speculum 10 may be set to minimize the blinding internal reflection and the narrowed field of view of the electronic camera 18, while still protecting the vulnerable electronic camera 18 from contamination and damage.

Referring again to fig. 6, approximately a quarter turn of removable speculum 10 causes tooth 52 to slide along one of the sloped sidewalls 84, 86 while segments 40a, 40b, 40c of removable speculum 10 flex outward (at least 0.1mm) to accommodate the outward movement of tooth 52. Once the teeth 52 are displaced from the grooves 58, the forward movement of the removable speculum 10 along the axis 20 allows the removable speculum 10 to be separated from the head 24 of the otoscope 16.

As is generally understood, the outer ear of a human patient includes a pinna that provides a sound collection structure. The pinna surrounds the ear canal 21 leading to and terminating in the tympanic membrane or eardrum. The ear canal 21 of a typical adult is approximately 25mm in length and the average diameter of the ear canal 21 is approximately 7 mm. Typically the infant's ear canal 21 is about 5mm in length and the average diameter of the ear canal 21 is about 3-4 mm.

Certain terminology is used herein for reference purposes only and is therefore not intended to be limiting. For example, terms such as "upper," "lower," "above," and "below" refer to directions in the drawings to which reference is made. Terms such as "forward," "rearward," "rear," "bottom," and "side," describe the orientation of parts of the assembly within a consistent but arbitrary frame of reference as will be apparent by reference to the relevant drawings and text describing the assembly in question. Such terms may include the words specifically mentioned above, derivatives thereof, and words of similar import. Similarly, the terms "first," "second," and other such numerical terms referring to structures do not imply a sequence or order unless clearly indicated by the context.

When introducing elements or features of the present disclosure and the exemplary embodiments, the articles "a," "an," "the," and "said" are intended to mean that there are one or more of such elements or features. The terms "comprising," "including," and "having" are intended to be open-ended and mean that there may be additional elements or features other than those specifically noted. It should also be understood that the method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be employed.

In particular, the invention is not limited to the embodiments and illustrations contained herein, and the claims should be understood to include modified forms of those embodiments including portions of the embodiments and combinations of elements of different embodiments as come within the scope of the claims. All publications, including patent and non-patent publications, described herein are incorporated by reference in their entirety.