Sheath for oral humidity tester and oral humidity tester kit

Abstract

The invention relates to the technical field of biosensors for diagnosis, in particular to a sheath for an oral humidity tester and an oral humidity tester kit, which can be used for disease examination of patients with xerostomia. The sheath comprises a first protective sheet, a first diaphragm, a second diaphragm and a second protective sheet which are sequentially stacked in the thickness direction, are all formed into long shapes which are long in the length direction and are all of flexible structures, and the flexibility of the first protective sheet and the second protective sheet is lower than that of the first diaphragm and that of the second diaphragm. The first diaphragm and the second diaphragm are joined to each other on a first end side in the longitudinal direction and on both end sides in a width direction perpendicular to the longitudinal direction and the thickness direction, thereby forming a sleeve-shaped body that can be opened on a second end side in the longitudinal direction; the first protection piece and the second protection piece are respectively provided with a first extension section and a second extension section which extend out of the first end side towards the length direction, and the first extension section and the second extension section are separably bonded.

Description

Technical Field

[0001] The present application relates to the technical field of biosensor for diagnostic purposes, and more particularly to a sheath for an oral humidity tester and an oral humidity tester kit. Background Art

[0002] An oral humidity tester is a medical device used to test oral humidity and is commonly used for examining the conditions of patients with xerostomia. For considerations such as avoiding cross-infection, during use, a disposable sheath meeting relevant hygiene standards needs to be sleeved on the part of the oral humidity tester that enters the oral cavity.

[0003] How to optimize the structural design of such a sheath so that medical staff can easily sleeve it on the oral humidity tester has been a topic of concern to those skilled in the art. Summary of the Invention

[0004] In view of this, the present application provides a sheath for an oral humidity tester and an oral humidity tester kit.

[0005] In a first aspect, a sheath is proposed for sleeving on the head of an oral humidity tester to separate the head from the inner wall of the oral cavity of the subject to be examined. The sheath is characterized in that the sheath includes a first protective sheet, a first membrane sheet, a second membrane sheet, and a second protective sheet that are sequentially laminated in the thickness direction, and are all formed into long-shaped shapes that are long in the length direction and are all flexible structures. The flexibility of the first protective sheet and the second protective sheet is lower than that of the first membrane sheet and the second membrane sheet. The first membrane sheet and the second membrane sheet are joined to each other at the first end side in the length direction and at both end sides in the width direction, thereby forming a sleeve-shaped body that can be opened at the second end side in the length direction. The width direction is perpendicular to the length direction and the thickness direction respectively;

[0006] The first protective sheet and the second protective sheet respectively have a first extending section and a second extending section that extend toward the first end side beyond the length direction, and the first extending section and the second extending section are detachably bonded.

[0007] In some possible embodiments, the dimension of the first extending section along the length direction is smaller than the dimension of the second extending section along the length direction.

[0008] In some possible embodiments, the first membrane sheet is detachably bonded to the first protective sheet over the entire area, and the bonding force between the first membrane sheet and the first protective sheet is smaller than the bonding force between the first extending section and the second extending section.

[0009] In some possible embodiments, the second protective sheet has a seventh surface facing the second diaphragm, and the seventh surface has an adhesive area detachably bonded to the second diaphragm. The adhesive area extends at least along the entire length of the second diaphragm in the length direction, and the dimension of the adhesive area in the width direction gradually decreases from the first end side to the second end side.

[0010] In some possible embodiments, the first protective sheet is detachably bonded to the first diaphragm, and the second protective sheet is detachably bonded to the second diaphragm;

[0011] When observed in the thickness direction, the first protective sheet completely covers the first diaphragm, and the second protective sheet completely covers the second diaphragm.

[0012] In some possible embodiments, the oral humidity tester has a clamping projection, the first diaphragm has a first strap extending in the length direction beyond the second end side, and the first strap has a first through-hole for sleeving on the clamping projection and penetrating in the thickness direction.

[0013] In some possible embodiments, the first protective sheet has a second strap covering the first strap and detachably bonded to the first strap, and the second strap has a second through-hole overlapping with the first through-hole.

[0014] In some possible embodiments, the second protective sheet has a third protruding section extending in the length direction beyond the second end side. The dimension of the third protruding section in the length direction is smaller than the dimension of the second strap in the length direction, and the dimension of the third protruding section in the width direction is larger than the dimension of the second strap in the width direction.

[0015] In some possible embodiments, the third protruding section is detachably bonded to the first strap.

[0016] In a second aspect, the present application provides a kit for an oral humidity tester, including:

[0017] The sheath as described in the first aspect, and

[0018] The oral humidity tester, the head of the oral humidity tester having a capacitive sensor for detecting the water content in the oral cavity of the subject.

[0019] According to the sheath for the oral humidity tester provided by the present application, on the one hand, in the non-use state, it can be kept in a flat configuration as a whole, suppressing wrinkle deformation, so that the storage and transportation of the sheath become easy. On the other hand, during use, it can be easily sleeved on the oral humidity tester, and the first protective sheet and the second protective sheet can be easily peeled off. Brief Description of the Drawings

[0020] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description only relate to some embodiments of the present application and do not limit the present application.

[0021] Figure 1 is a schematic cross-sectional view of an oral humidity tester kit provided by an embodiment of the present application in a use state.

[0022] Figure 2 is Figure 1 a schematic diagram of the oral humidity tester kit in the assembly process in

[0023] Figure 3 is Figure 1 an exploded schematic diagram of the corresponding sheath of the embodiment of

[0024] Figure 4 is Figure 1 a schematic cross-sectional view of the corresponding sheath of the embodiment of in a non-use state.

[0025] Figure 5 is an exploded schematic diagram of a sheath provided by another embodiment of the present application.

[0026] Figure 6 is Figure 5 a schematic cross-sectional view of the corresponding sheath of the embodiment of in a non-use state.

[0027] Figure 7 is Figure 5 a schematic diagram of the relative positions of the first diaphragm and the second protective sheet of the corresponding embodiment of in the top view direction.

[0028] Figure 8 is an exploded schematic diagram of a sheath provided by yet another embodiment of the present application.

[0029] Figure 9 is Figure 8 a schematic cross-sectional view of the corresponding sheath of the embodiment of in a non-use state.

[0030] Description of the Reference Numerals:

[0031] 1000 - Oral Humidity Tester Kit;

[0032] 100 - Oral Humidity Tester, 200 - Sheath;

[0033] DR1 - Thickness Direction, DR2 - Length Direction, DR3 - Width Direction;

[0034] 1 - First protective sheet, 1U - First surface, 1D - Second surface, 11 - Second drawstring, 12 - Second socket hole, 13 - First protruding section;

[0035] 2 - First diaphragm, 2U - Third surface, 2D - Fourth surface, 21 - First drawstring, 22 - First socket hole;

[0036] 3 - Second diaphragm, 3U - Fifth surface, 3D - Sixth surface;

[0037] 4 - Second protective sheet, 4U - Seventh surface, 4D - Eighth surface, 41 - Second adhesive, 4P - Bonding area, 42 - Second protruding section, 43 - Third protruding section;

[0038] 5 - Sleeve body, 5R - First end side, 5L - Second end side, 51 - Opening;

[0039] 6 - Handle part, 61 - Locking convex;

[0040] 7 - Head, 71 - Capacitive sensor. Specific embodiments

[0041] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. Based on the described embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application. It can be understood that, without conflict, some technical means described in the various embodiments herein may be replaced or combined with each other.

[0042] In the description of the specification and claims of this application, if there are terms such as "first" and "second", they are only used to distinguish the described objects and do not have any sequential or technical meaning. Thus, the objects defined with "first", "second", etc. may explicitly or implicitly include one or more of such objects. Also, words such as "one" or "a" do not represent a quantity limitation, but rather indicate the existence of at least one, and "multiple" means not less than two.

[0043] Figure 1 The oral humidity tester kit 1000 according to an embodiment of this application includes an oral humidity tester 100 and a disposable sheath 200 for providing hygiene.

[0044] The oral humidity tester 100 is an oral examination instrument capable of detecting the humidity in the oral cavity. It has a handle portion 6 for an operator, such as a medical staff member, to hold, and a head portion 7 extending from one end of the handle portion 6 away from the operator. The end side of the head portion 7 is provided with a capacitive sensor 71, which is sensitive to moisture or humidity and can thus measure the humidity (water content) in the oral cavity. Moreover, since the dielectric properties of the moisture in the oral cavity vary according to the amount of water content, even if the moisture in the subject's oral cavity does not directly contact the capacitive sensor 71, the capacitive sensor 71 can determine the water content of the oral cavity by detecting the change in the aforementioned dielectric properties. Since such capacitive sensors 71 are well-known to those skilled in the art, they will not be elaborated here.

[0045] In use, the sheath 200 is put on the oral humidity tester 100 to cover the head portion 7 including the aforementioned capacitive sensor 71. The operator holds the handle portion 6 of the oral humidity tester 100 and inserts the head portion 7 into the oral cavity of a subject, such as a xerostomia patient (the handle portion 6 remains outside the oral cavity), and presses the head portion 7 against the tongue surface of the subject so that the capacitive sensor 71 of the head portion 7 is close to but does not contact the tongue surface of the subject, thereby measuring the water content at the tongue surface. Since the head portion 7 inserted into the oral cavity is covered by the disposable sheath 200 that has been hygienically treated at the factory, the sheath 200 meeting the set hygiene standards separates the head portion 7 of the oral humidity tester 100 from the inner wall of the oral cavity (such as the tongue surface), thus ensuring the hygiene and safety during the aforementioned examination process.

[0046] Please refer to Figure 3 and Figure 4 , the sheath 200 includes a first protective sheet 1, a first membrane 2, a second membrane 3, and a second protective sheet 4 that are sequentially laminated in the thickness direction DR1 and are all of flexible structures. Moreover, the flexibility of the first protective sheet 1 and the second protective sheet 4 is lower than that of the first membrane 2 and the second membrane 3, that is, compared with the first protective sheet 1 and the second protective sheet 4, the first membrane 2 and the second membrane 3 are more likely to deform.

[0047] The first protective sheet 1 is formed in an elongated shape that is longer in the length direction DR2. It has a first surface and a second surface that are opposite to each other in the thickness direction DR1, and a first adhesive (not shown) is closely bonded to the second surface.

[0048] The first membrane 2 is also formed in an elongated shape that is longer in the length direction DR2. It has a third surface and a fourth surface that are opposite to each other in the thickness direction DR1. The third surface faces the second surface of the first protective sheet 1, and the second surface of the first protective sheet 1 is separably bonded to the third surface of the first membrane 2 via the aforementioned first adhesive. When the operator peels the first protective sheet 1 from the first membrane 2 with a finger, the first adhesive separates from the first membrane 2 while remaining attached to the second surface.

[0049] The second diaphragm 3 is also formed in an elongated shape that is longer in the longitudinal direction DR2, and has a fifth surface and a sixth surface that are opposite to each other in the thickness direction DR1, where the fifth surface faces the fourth surface of the first diaphragm 2. Moreover, the first diaphragm 2 and the second diaphragm 3 are joined to each other at the first end side 5R in the longitudinal direction DR2 and at both end sides in the width direction DR3, thereby forming a sleeve shape that can be opened at the second end side 5L in the longitudinal direction DR2, where the width direction DR3 is perpendicular to the longitudinal direction DR2 and the thickness direction DR1 respectively. It should be understood that the first end side 5R and the second end side 5L are two end sides that are opposite to each other in the longitudinal direction DR2.

[0050] The second protective sheet 4 is also formed in an elongated shape that is longer in the longitudinal direction DR2, and has a sixth surface and a seventh surface that are opposite to each other in the thickness direction DR1, where the sixth surface faces the fifth surface of the second diaphragm 3. Moreover, a second adhesive is closely bonded to the sixth surface, and the sixth surface of the second protective sheet 4 is separably adhered to the fifth surface of the second diaphragm 3 via the second adhesive. When the operator peels the second protective sheet 4 from the second diaphragm 3 using a finger, the second adhesive separates from the second diaphragm 3 in a state of adhering to the second surface.

[0051] When viewed in the thickness direction DR1, the first protective sheet 1 covers the entire first diaphragm 2, and the second protective sheet 4 covers the entire second diaphragm 3. Thus, in a non-use state such as a storage state, the first protective sheet 1 and the second protective sheet 4 separate the outer surfaces (the third surface and the sixth surface) of the first diaphragm 2 and the second diaphragm 3 that will come into contact with the subject's oral cavity in the future from the external environment, so as to maintain the hygiene of the third surface and the sixth surface.

[0052] In this embodiment, the first protective sheet 1, the first diaphragm 2, the second diaphragm 3, and the second protective sheet 4 are all formed of resin, and by designing the thicknesses of the first protective sheet 1 and the second protective sheet 4 to be greater than the thicknesses of the first diaphragm 2 and the second diaphragm 3, the flexibility of the first protective sheet 1 and the second protective sheet 4 is lower than that of the first diaphragm 2 and the second diaphragm 3, and based on this, the first protective sheet 1 and the second protective sheet 4 have a greater deformation stiffness and can be well maintained in Figure 3 and Figure 4 the straight state shown. As a result, the wrinkling deformation of the sheath 200 in the non-use state can be suppressed, and the storage and transportation of the sheath 200 in the non-use state become easy.

[0053] The second protective sheet 4 and the second diaphragm 3 are both formed into a substantially rectangular shape, and the second protective sheet 4 and the second diaphragm 3 have the same size in the width direction DR3, but the second protective sheet 4 has a larger size in the length direction DR2 than the second diaphragm 3 in the length direction DR2. Different from the second protective sheet 4 and the second diaphragm 3, the first protective sheet 1 and the first diaphragm 2 each have a substantially rectangular main body portion and a strip portion extending from one side of the main body portion. Among them, the strip portion of the first diaphragm 2 constitutes the first drawstring 21, and the strip portion of the first protective sheet 1 constitutes the second drawstring 11. Specifically, the first protective sheet 1 has the aforementioned first drawstring 21 extending toward the second end side 5L (i.e., the position of the opening 51) beyond the length direction DR2, the first protective sheet 1 has the aforementioned second drawstring 11 covering the first drawstring 21 and separably bonded to the first drawstring 21 through the aforementioned first adhesive, and the first drawstring 21 has a first through-hole 22 penetrating in the thickness direction DR1, and the second drawstring 11 has a second through-hole 12 overlapping with the first through-hole 22.

[0054] In addition, the first protective sheet 1 and the second protective sheet 4 respectively have a first protruding section 13 and a second protruding section 42 extending toward the second end side 5L beyond the first end side 5R in the length direction DR2, and the first protruding section 13 and the second protruding section 42 are separably bonded through the aforementioned second adhesive. For the convenience of the reader to understand the present technology, Figure 4 the thickness of the second adhesive between the first protruding section 13 and the second protruding section 42 is exaggeratedly shown. In addition, for convenience, Figure 4 the first adhesive between the first diaphragm 2 and the first protective sheet 1 and the second adhesive 41 between the second diaphragm 3 and the second protective sheet 4 are omitted.

[0055] Please review Figure 1, a clamping projection 61 is provided on the handle portion 6 of the oral humidity tester 100. During use, the operator can hold the extended ends of the first pull strap 21 and the second pull strap 11 with fingers and pull upward. Correspondingly, the main body parts of the first diaphragm 2 and the first protective sheet 1 move upward away from the second diaphragm 3 and the second protective sheet 4 at the second end side 5L under the drive of the first pull strap 21 and the second pull strap 11, thereby forming an opening 51. Then, the head 7 of the oral humidity tester 100 is inserted into the space between the first diaphragm 2 and the second diaphragm 3 through the opening 51. When the head 7 of the oral humidity tester 100 is inserted in place and abuts against the bottom wall of the sleeve body 5 formed by the first diaphragm 2 and the second diaphragm 3, the first sleeve hole 22 of the first pull strap 21 and the second sleeve hole 12 of the second pull strap 11 are sleeved on the clamping projection 61 of the handle portion 6 of the oral humidity tester 100, so that the sheath 200 (the first diaphragm 2 and the second diaphragm 3) can be stably held on the oral humidity tester 100, preventing the sheath 200 from detaching from the oral humidity tester 100 during the test. After that, the first protective sheet 1 and the second protective sheet 4 are peeled off from the sleeve body 5, and only the first diaphragm 2 and the second diaphragm 3 are allowed to enter the oral cavity of the subject.

[0056] Since the relatively more deformable-rigid second pull strap 11 is adhesively laminated on the soft first pull strap 21, on the one hand, in the non-use state, the second pull strap 11 can keep the first pull strap 21 in a straight form, preventing the first pull strap 21 from curling, folding or even being damaged. On the other hand, during the installation of the sheath 200, the operator can easily lift the first pull strap 21 to open the opening 51 of the sleeve body 5. On the other hand, during the installation of the sheath 200, the first protective sheet 1 can keep the first sleeve hole 22 in a fixed shape, so that the first sleeve hole 22 of the first pull strap 21 can be easily sleeved on the clamping projection 61 of the oral humidity tester 100.

[0057] Please refer to Figure 2, it can be understood that since the head 7 of the oral humidity tester 100 has a certain thickness and the first protective sheet 1 and the second protective sheet 4 have low flexibility (i.e., have a large deformation rigidity), when the head 7 of the oral humidity tester 100 is inserted in place and abuts against the bottom wall of the first end side 5R of the sleeve 5 formed by the first diaphragm 2 and the second diaphragm 3, the first extended section 13 of the first protective sheet 1 and the second extended section 42 of the second protective sheet 4 that were originally bonded together are separated from each other by the head 7 of the oral humidity tester 100. In this way, the operator can grasp the separated first extended section 13 and second extended section 42 and move them relatively away from each other in the thickness direction DR1, so that the first protective sheet 1 and the second protective sheet 4 are respectively peeled off from the first diaphragm 2 and the second diaphragm 3 from the first end side 5R (non-opening 51 side) to the second end (opening 51 side). And, compared with the case where the first protective sheet 1 and the second protective sheet 4 are peeled off from the second end side 5L to the first end side 5R of the sleeve 5, in the embodiment of the present application, the first protective sheet 1 and the second protective sheet 4 are peeled off from the non-opening 51 side to the opening 51 side of the sleeve 5, which can well prevent the opening 51 part of the sleeve 5 from being damaged due to the pulling force, and helps to inhibit the first hole from detaching from the convex 61.

[0058] During use, such an accident may also occur with a small probability: when the head 7 of the oral humidity tester 100 is inserted in place and abuts against the bottom wall of the sleeve 5 formed by the first diaphragm 2 and the second diaphragm 3, the first extended section 13 and the second extended section 42 fail to completely separate and remain partially bonded. In view of this, please also refer to Figures 2 to 4 , in this embodiment, the dimension of the first extended section 13 in the length direction DR2 is designed to be smaller than the dimension of the second extended section 42 in the length direction DR2. Through such a design, even if the aforementioned accident occurs, the operator can still peel off the second protective sheet 4 from the second diaphragm 3 by grasping the part of the second extended section 42 that extends beyond the first extended section 13, and then, by grasping the first extended section 13, peel off the first protective sheet 1 from the first diaphragm 2. In some other embodiments, the dimension of the first extended section 13 in the length direction DR2 can also be designed to be larger than the dimension of the second extended section 42 in the length direction DR2.

[0059] It can also be understood that since the first protective sheet 1 and the second protective sheet 4 are bonded to each other at the first extended section 13 and the second extended section 42, the overall sheath 200 can be stably maintained in a flat configuration as shown in Figure 4 in the non-use state, and the first diaphragm 2 and the second diaphragm 3 are stably clamped between the first protective sheet 1 and the second protective sheet 4, so that such an accident is not likely to occur: the first diaphragm 2 and the second diaphragm 3 move away from each other in the thickness direction DR1, resulting in the sleeve being accidentally opened or wrinkled in the non-use state.

[0060] In this embodiment, the first diaphragm 2 is detachably bonded to the first protective sheet 1 over the entire area, that is, the entire third surface of the first diaphragm 2 is bonded to the second surface of the first protective sheet 1. Based on such a design, in Figure 4 the non-use state shown, since the first diaphragm 2 is held by the relatively rigid (less flexible) first protective sheet 1 over the entire area, it is not likely to generate unwanted wrinkles. And since both width sides of the second diaphragm 3 are held by the first protective sheet 1, the second diaphragm 3 is also not likely to generate unwanted wrinkles.

[0061] Moreover, the bonding force between the first diaphragm 2 and the first protective sheet 1 is less than the bonding force between the first protruding section 13 and the second protruding section 42, that is, the bonding force between the first diaphragm 2 and the first protective sheet 1 is relatively small. Therefore, during the process of inserting the head 7 of the oral humidity tester 100 into the space between the first diaphragm 2 and the second diaphragm 3, the bonding position between the first diaphragm 2 and the first protective sheet 1 can be easily partially separated according to the cross-sectional shape of the head 7 (for example, circular), for example, separation occurs at the parts on both width sides of the first diaphragm 2, which helps to improve the smoothness of inserting the head 7 of the oral humidity tester 100 into the sheath 200. In addition, the difference in the bonding force magnitude can be achieved by configuring the thickness of the first adhesive to be different at different positions.

[0062] Please return Figure 3 , the aforementioned second adhesive disposed on the seventh surface of the second protective sheet 4 forms a bonding area 4P, which is separably bonded to the sixth surface of the second diaphragm 3, and the bonding area 4P extends at least over the entire length direction DR2 of the second diaphragm 3, and the dimension of the bonding area 4P in the width direction DR3 gradually becomes smaller from the first end side 5R to the second end side 5L. Through such a design, on the one hand, the flatness of the second diaphragm 3 can be further ensured in the non-use state to prevent the second diaphragm 3 from generating wrinkles. On the other hand, when the operator pulls up the first pull strap 21 and the second pull strap 11, both width sides of the second diaphragm 3 at the second end side 5L will move upward and away from the second protective sheet 4, and the width middle part of the second diaphragm 3 at the second end side 5L is temporarily held on the second protective sheet 4, thereby forming an opening 51 that is easily inserted by the head 7 of the oral humidity tester 100.

[0063] Next, please refer to Figures 5 to 7 , Figures 5 to 7The sheath 200 provided by another embodiment of the present application is shown. Different from the above situation, in this embodiment, the second flap 4 has a third protruding section 43 that extends toward the length direction DR2 beyond the second end side 5L. The dimension of the third protruding section 43 along the length direction DR2 is smaller than the dimension of the second pulling strap 11 along the length direction DR2, and the dimension of the third protruding section 43 along the width direction DR3 is larger than the dimension of the second pulling strap 11 along the width direction DR3. Through such a design, the operator can hold the third protruding section 43 of the second flap 4 with one hand and hold the first pulling strap 21 and the second pulling strap 11 with the other hand, so as to more easily obtain the opening 51 at the second end side 5L.

[0064] In Figures 5 to 7 the shown embodiment, the third protruding section 43 of the second flap 4 is not connected to the first pulling strap 21 of the first diaphragm 2. Therefore, in the non-use state, such an accident may occur: the risk that the second flap 4 peels off from the second diaphragm 3 with the third protruding section 43 as the peeling starting point. To reduce this risk, in Figure 8 and Figure 9 another shown embodiment, the bonding area 4P of the seventh surface 4U also extends to the third protruding section 43, so that the third protruding section 43 and the first pulling strap 21 are separably bonded.

Claims

1. A protective cover, used for covering the head of an oral humidity tester to separate the head from the inner wall of the oral cavity of a subject, characterized in that: The sheath comprises a first protective sheet, a first diaphragm, a second diaphragm and a second protective sheet which are sequentially stacked in the thickness direction and are all formed into an elongated shape longer in the length direction and are all flexible structures, the flexibility of the first protective sheet and the second protective sheet is lower than that of the first diaphragm and the second diaphragm, the first diaphragm and the second diaphragm are joined to each other at a first end side in the length direction and at two end sides in the width direction, thereby forming a sleeve-shaped body which can be opened at a second end side in the length direction, and the width direction is perpendicular to the length direction and the thickness direction respectively; The first guard plate and the second guard plate respectively have a first extending section and a second extending section extending beyond the first end side in the length direction, and the first extending section and the second extending section are detachably bonded.

2. The sheath according to claim 1, characterized in that A dimension of the first extending section along the length direction is smaller than a dimension of the second extending section along the length direction.

3. The sheath according to claim 2, characterized in that: The first film sheet is detachably bonded to the first guard sheet over the entire area, and the bonding force between the first film sheet and the first guard sheet is smaller than the bonding force between the first extending section and the second extending section.

4. The sheath according to claim 3, characterized in that The second protective sheet has a seventh surface facing the second diaphragm, and the seventh surface has a bonding area that is detachably bonded to the second diaphragm, the bonding area extends at least over the entire length of the second diaphragm along the length direction, and the size of the bonding area in the width direction gradually decreases from the first end side to the second end side.

5. The sheath according to claim 1, characterized in that The first guard sheet is detachably bonded to the first film sheet, and the second guard sheet is detachably bonded to the second film sheet; When viewed along the thickness direction, the first protective sheet completely covers the first membrane sheet, and the second protective sheet completely covers the second membrane sheet.

6. The sheath according to claim 1, characterized in that The oral humidity tester has a locking protrusion, the first membrane has a first drawstring extending in the length direction to outside the second end side, and the first drawstring has a first set of holes penetrating in the thickness direction for being sleeved on the locking protrusion.

7. The sheath according to claim 6, characterized in that The first guard plate has a second draw tape covering the first draw tape and detachably bonded to the first draw tape, and the second draw tape has a second hole overlapping the first hole.

8. The sheath according to claim 7, characterized in that The second guard plate has a third extension section extending in the length direction to beyond the second end side, the dimension of the third extension section along the length direction is smaller than the dimension of the second draw tape along the length direction, and the dimension of the third extension section along the width direction is larger than the dimension of the second draw tape along the width direction.

9. The sheath according to claim 8, characterized in that The third extension section is detachably bonded to the first draw tape.

10. An oral humidity tester kit, characterized in that: include: A sheath as claimed in any one of claims 1 to 9, and The oral humidity tester has a head with a capacitive sensor for detecting the water content in the oral cavity of a subject.

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