CN114366350A

CN114366350A - Rubber dam frame

Info

Publication number: CN114366350A
Application number: CN202210111227.8A
Authority: CN
Inventors: 梁昭璜
Original assignee: Beijing Stomatological Hospital
Current assignee: Beijing Stomatological Hospital
Priority date: 2022-01-29
Filing date: 2022-01-29
Publication date: 2022-04-19

Abstract

The application provides a rubber dam frame, including first stake body and second stake body. The first support body comprises a bottom beam, a first support arm and a second support arm, wherein the first support arm and the second support arm are positioned at two ends of the bottom beam, and the first support arm, the bottom beam and the second support arm form a U-shaped frame. The second support body comprises a first extension arm hinged with the first support arm and a second extension arm hinged with the second support arm. The second cradle body is configured to a support state and a folded state with respect to the first cradle body: in the supporting state, the second bracket body and the first bracket body support together and unfold the rubber dam; in the folded state, the second bracket body can rotate relative to the first bracket body. The technical scheme of this application not only can support well and expand the rubber dam, and the rubber dam frame possesses folding structure moreover, and the patient can be closed the rest midway, has improved patient's treatment travelling comfort.

Description

Rubber dam frame

Technical Field

The application relates to the technical field of oral medical instruments, in particular to a rubber dam frame.

Background

A dam (also called a moisture barrier) system, which is a set of medical instruments that can isolate a patient's teeth from the oral environment to facilitate endodontic treatment of the tooth. It can prevent chemical medicine from irritating oral cavity soft tissue, protect patient, prevent aspiration and swallow foreign matter by mistake, and reduce liquid splash during oral treatment.

The rubber dam system at least comprises a rubber dam, a rubber dam puncher, a rubber dam frame and a rubber dam clamp. When the rubber dam is used, a rubber dam puncher is used for punching a hole which is suitable for a tooth at a suitable position of the rubber dam, a U-shaped rubber dam frame which is fixed in a frame shape is used for propping open the rubber dam, so that the rubber dam is unfolded into an elastic surface which is larger than the outline of a mouth, then the position of the tooth is operated according to needs, then the punched position of the rubber dam can be pressed and placed at the tooth position in the mouth, the tooth to be treated passes through a hole sleeve on the rubber dam to the neck of the tooth, then the tooth is clamped by a rubber dam clamp, the rubber dam is prevented from being separated from the tooth, and therefore the tooth is isolated from the oral environment.

Most of the rubber dam frames are U-shaped fixed frames which cannot be folded, so that the patient can only keep the mouth opening state when the rubber dam is used. When a doctor needs to operate for a long time, a patient cannot have a rest in a closed state, so that the patient is easy to have fatigue of muscles in the open-close state, the treatment process is extremely uncomfortable, and even temporomandibular joint disorder and different degrees of pain of chewing muscle groups occur for a certain time after treatment.

Disclosure of Invention

An object of the embodiment of this application is to provide a rubber dam frame, it not only can support well and expand the rubber dam, and the rubber dam frame possesses folding structure moreover, and the patient can close the rest midway, has improved patient's treatment travelling comfort.

The application provides a rubber dam frame, including first stake body and second stake body. The first support body comprises a bottom beam, a first support arm and a second support arm, wherein the first support arm and the second support arm are positioned at two ends of the bottom beam, and the first support arm, the bottom beam and the second support arm form a U-shaped frame. The second support body comprises a first extension arm hinged with the first support arm and a second extension arm hinged with the second support arm. The second cradle body is configured to a support state and a folded state with respect to the first cradle body: in the supporting state, the second bracket body and the first bracket body support together and unfold the rubber dam; in the folded state, the second bracket body can rotate relative to the first bracket body.

In an implementation scheme, the first extension arm and the second extension arm are two independent parts, and the first extension arm is hinged to the tail end of the first support arm; the second extension arm is hinged at the tail end of the second support arm; the first extension arm and the second extension arm are the same in length and the same in the direction of hinge rotation.

In an implementable aspect, the second cradle body further comprises an extension beam connecting the first extension arm and the second extension arm for simultaneously rotating the first extension arm about the end of the first support arm and the second extension arm about the end of the second support arm.

In an implementation scheme, a first limiting lock is installed at a hinged position of a first extension arm and a first support arm, the first limiting lock comprises a locking state and an unlocking state, when the first limiting lock is in the locking state, a preset included angle is formed between the first extension arm and the first support arm, and the hinged position cannot rotate, when the first limiting lock is in the unlocking state, the hinged position of the first extension arm and the first support arm can rotate within a preset angle range, and/or a second limiting lock is installed at the hinged position of the second extension arm and a second support arm, the second limiting lock comprises the locking state and the unlocking state, when the second limiting lock is in the locking state, the preset included angle is formed between the second extension arm and the second support arm, and the hinged position of the second extension arm and the second support arm can not rotate within the preset angle range.

In one implementation scheme, the first limit lock and the second limit lock have the same structure; the first limiting lock comprises a first connecting rod and a second connecting rod, the first connecting rod comprises a first end and a second end, the second connecting rod also comprises a first end and a second end, the first end of the first connecting rod is hinged with the first end of the second connecting rod, the second end of the first connecting rod is hinged with the first support arm, the second end of the second connecting rod is hinged with the first extension arm, and the first connecting rod, the second connecting rod, the first support arm and the first extension arm form a four-bar mechanism; when the first limit lock 30 is in the locked state, the four-bar mechanism is in the dead point position; when the first limit lock 30 is in the unlocked state, the four-bar mechanism is disengaged from the dead point position.

In an implementable scheme, an included angle formed by the first extension arm and the first support arm ranges from 0 degree to 180 degrees, and an included angle formed by the second extension arm and the second support arm ranges from 0 degree to 180 degrees.

In an implementable scheme, when the four-bar mechanism formed by the first limiting lock, the first support arm and the first extension arm is located at a dead point position, an included angle between the first support arm and the first extension arm is 180 degrees, and when the four-bar mechanism formed by the first limiting lock, the first support arm and the first extension arm is separated from the dead point position, the included angle between the first support arm and the first extension arm is less than 180 degrees. When the four-bar mechanism that second spacing lock and second support arm and second extension arm constitute is in the dead point position, the contained angle of second support arm and second extension arm becomes 180 degrees, and when the four-bar mechanism that second spacing lock and second support arm and second extension arm constitute breaks away from the dead point position, the contained angle of second support arm and second extension arm is less than 180 degrees.

In one embodiment, a pipette support assembly and a pipette, which is arranged on the pipette support assembly and is used to absorb oral liquid, are arranged on the first support assembly.

In one embodiment, the pipette support assembly includes a flexible sleeve mounted to the first support body with a pipette disposed therethrough.

In one embodiment, the pipette support assembly further comprises a clamp for removably mounting the flexible sleeve to the first support body.

Compared with the prior art, the beneficial effect of this application is:

when using the rubber dam frame of this application, make the second stake body be in support state for first stake body, then use second stake body and first stake body jointly to expand the rubber dam of having punched, then establish the hole cover on the rubber dam to the tooth, the rubber dam of the complete extension this moment will hinder patient's the action of closing the mouth. When the patient need close the rest, make the second stake body be in fold condition for first stake body, can rotate through articulated position between second stake body and the first stake body this moment, the rubber dam is folded by first stake body and second stake body this moment, and the patient can close the rest, improves the travelling comfort of treatment, makes the treatment process more humanized.

In addition, because articulated between second stake body and the first stake body, first stake body and second stake body can follow the action that the patient opened the mouth and closed and take place to rotate to make the patient still can make the action of opening the mouth when wearing the rubber dam, make the patient can carry out normal speech communication. When the rubber barrier support in the prior art is used, a patient can hardly have a rest by closing the mouth, and normal speech communication through the opening and closing mouth is more difficult to realize.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic structural view of a rubber dam holder according to an embodiment of the present application;

fig. 2 is a schematic structural view of another rubber dam holder according to an embodiment of the present application;

FIG. 3 is an enlarged view of a portion of the structure at A in FIG. 1;

FIG. 4 is a perspective view of the rubber dam holder of FIG. 1 in a folded state;

FIG. 5 is a side view of the rubber dam holder of FIG. 1 in a supporting position;

FIG. 6 is a side view of the rubber dam holder of FIG. 1 in a folded state;

fig. 7 is a schematic view of an elastic barrier with a liquid absorbing structure according to an embodiment of the present application.

In the figure:

10. a first stent body; 11. a bottom beam; 12. a first support arm; 13. a second support arm; 14. a pipette rack assembly; 141. a flexible sleeve; 142. a clamp; 15. a straw; 16. a protrusion; 20. a second stent body; 21. a first extension arm; 22. a second extension arm; 23. an extension beam; 30. a first limit lock; 31. a first link; 32. a second link; 40. and a second limit lock.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

According to a first aspect of the present application, as shown in fig. 1, there is provided a rubber dam holder, including a first holder body 10 and a second holder body 20. The first bracket body 10 includes a base beam 11, and a first arm 12 and a second arm 13 located at both ends of the base beam 11, and the first arm 12, the base beam 11, and the second arm 13 constitute a U-shaped frame. The second support body 20 includes a first extension arm 21 hinged to the first support arm 12 and a second extension arm 22 hinged to the second support arm 13. The second cradling body 20 is configured in a supporting state and a folded state with respect to the first cradling body 10: in the supporting state, the second bracket body 20 and the first bracket body 10 support and unfold the rubber dam together; in the folded state, the second bracket body 20 is rotatable with respect to the first bracket body 10. Fig. 1, 2 and 4 are schematic views of a support state, and fig. 3 and 5 are schematic views of a folding state, and the process from the support state to the folding state can be referred to as a transition state, which is not shown in the figures.

When the rubber dam frame of the present embodiment is used, the second frame body 20 is in a supporting state relative to the first frame body 10, then the second frame body 20 and the first frame body 10 are used together to unfold the rubber dam with a hole, and then the hole on the rubber dam is sleeved on the tooth, at this time, the completely extended rubber dam will block the closing action of the patient. When the patient need close the rest, make the second stake body 20 be in fold condition for first stake body, can rotate through articulated position between second stake body 20 and the first stake body 10 this moment, the rubber dam is folded by first stake body 10 and second stake body 20 this moment, and the patient can close the rest, improves the travelling comfort of treatment, makes the treatment process humanized more.

In addition, because the second support body 20 is articulated with the first support body 10, the first support body 10 and the second support body 20 can rotate (namely, the transition state between the support state and the folding state) along with the opening and closing actions of the patient, so that the patient can still make the opening and closing actions when wearing the rubber barriers, and the patient can carry out normal speech communication. When the rubber barrier support in the prior art is used, a patient can hardly have a rest by closing the mouth, and normal speech communication through the opening and closing mouth is more difficult to realize.

In one embodiment, as shown in FIG. 1, the first extension arm 21 and the second extension arm 22 are two separate pieces, the first extension arm 21 being hingedly connected to the end of the first arm 12; the second extension arm 22 is hinged to the end of the second arm 13; the first extension arm 21 and the second extension arm 22 have the same length and the same direction of hinge rotation. The first extension arm 21 and the second extension arm 22 are independent of each other, representing that the rotation of the first extension arm and the second extension arm can not interfere with each other, and can be adapted to the action of the rubber dam frame caused by the more complicated mouth action in the speech process of the opening and closing mouth.

In one embodiment, as shown in FIG. 2, the second support body 20 further includes an extension beam 23, the extension beam 23 connecting the first extension arm 21 and the second extension arm 22 for simultaneously rotating the first extension arm 21 about the end of the first arm 12 and the second extension arm 22 about the end of the second arm 13. The first extension arm 21, the second extension arm 22 and the extension beam 23 form a whole, so that the number of parts is reduced, and the whole folding rubber dam can be realized, and a patient can have a rest with a closed mouth.

In one embodiment, in the embodiment shown in fig. 2, a first limit lock 30 may be installed at a rotation connection point of the first extension arm 21 and the first support arm 12, the first limit lock 30 includes a locked state and an unlocked state, when the first limit lock 30 is in the locked state, the first extension arm 21 and the first support arm 12 form a predetermined included angle, and the hinge point cannot rotate, and when the first limit lock 30 is in the unlocked state, the hinge point of the first extension arm 21 and the first support arm 12 can rotate within a predetermined angle range. Or a second limit lock 40 is installed at the hinged position of the second extension arm 22 and the second support arm 13, the second limit lock 40 includes a locking state and an unlocking state, when the second limit lock 40 is in the locking state, the second extension arm 22 and the second support arm 13 form a predetermined included angle, and the hinged position cannot rotate, and when the second limit lock 40 is in the unlocking state, the hinged position of the second extension arm 22 and the second support arm 13 can rotate within a predetermined angle range.

In the embodiment shown in fig. 2, since the extension beam 23 connects the first extension arm 21 and the second extension arm 22, the first extension arm 21 and the second extension arm 22 rotate synchronously, and thus only one of the first limit lock 30 and the second limit lock 40 is required. The limit lock not only facilitates posture adjustment of medical staff during oral surgery, but also facilitates the patient in the surgery to have a rest in a closed state.

In one embodiment, if in the embodiment shown in fig. 1, because the first extension arm 21 and the second extension arm 22 are independently rotatable, it is preferable to install a first limit lock 30 at the rotational connection between the first extension arm 21 and the first arm 12, and a second limit lock 40 at the hinge connection between the second extension arm 22 and the second arm 13, so as to achieve the independent rotation of the first extension arm 21 and the second extension arm 22.

The limit lock can be in various structural forms such as a damping hinge, a buckle structure, a ratchet structure and the like.

In one embodiment, as shown in fig. 3, a form of construction of a first limit lock 30 and a second limit lock is provided. The first position limiting lock 30 and the second position limiting lock 40 have the same structure. The first limit lock 30 comprises a first connecting rod 31 and a second connecting rod 32, the first connecting rod 31 comprises a first end and a second end, the second connecting rod 32 also comprises a first end and a second end, the first end of the first connecting rod 31 is hinged to the first end of the second connecting rod 32, the second end of the first connecting rod 31 is hinged to the first arm 12, the second end of the second connecting rod 32 is hinged to the first extension arm 21, and the first connecting rod 31, the second connecting rod 32, the first arm 12 and the first extension arm 21 form a four-bar mechanism. When the first limit lock 30 is in the locked state, the four-bar mechanism is in the dead point position; when the first limit lock 30 is in the unlocked state, the four-bar mechanism is disengaged from the dead point position.

In the scheme of the limit lock shown in fig. 3, the dead point principle of the four-bar mechanism is utilized, and the problem of locking the support arm and the extension arm is well solved in a simpler structural form, so that the rubber dam frame can effectively support the rubber dam. And the dead point position of the four-bar mechanism is easy to break, so that when a patient needs to have a rest in a closed state, the medical staff only needs to push the first connecting rod 31 or the second connecting rod 32 to separate from the dead point position, the extension arm and the support arm can rotate relatively, the patient can also have a rest in a closed state, and the operation is convenient and simple. When the supporting state is recovered, the extension arm and the support arm only need to be rotated to enable the quadrilateral structure to enter the dead point position, so that the rubber dam is supported.

In one embodiment, the angle formed by the first extension arm 21 and the first arm 12 ranges from 0 to 180 degrees, and the angle formed by the second extension arm 22 and the second arm 13 ranges from 0 to 180 degrees. The range of the angle is limited to ensure that the rotation of the extension arm relative to the support arm can only be towards the front side of the mouth and can not be towards the side attached to the face. If the one side that is close to the face towards rotates, the patient closes the mouth, drives the rubber dam and to the internal contraction, pulls extension arm and support arm and surpasses and press close to on the face, reaches the certain degree after, and the rubber dam can't contract to the internal contraction, and extension arm and support arm paste also can't rotate on the face again for the patient can't close the rest. If the user rotates towards the front side of the mouth, the extending arm and the supporting arm can fold the rubber dam, so that the closing action is smoothly finished.

In one embodiment, as shown in fig. 3, when the four-bar mechanism formed by the first limit lock 30 and the first arm 12 and the first arm 21 is at the dead point position, the included angle between the first arm 12 and the first arm 21 is 180 degrees, and when the four-bar mechanism formed by the first limit lock 30 and the first arm 12 and the first arm 21 is separated from the dead point position, the included angle between the first arm 12 and the first arm 21 is less than 180 degrees. When the four-bar mechanism formed by the second limit lock 40, the second support arm 13 and the second extension arm 22 is located at the dead point position, the included angle between the second support arm 13 and the second extension arm 22 is 180 degrees, and when the four-bar mechanism formed by the second limit lock 40, the second support arm 13 and the second extension arm 22 is separated from the dead point position, the included angle between the second support arm 13 and the second extension arm 22 is less than 180 degrees.

In the scheme of the limit lock shown in fig. 3, the supporting arm and the extension arm are in the dead point position of the four-bar mechanism when forming an angle of 180 degrees, so that the rubber barrier is effectively supported by the dead point principle of the four-bar mechanism when the supporting arm and the extension arm of the rubber barrier frame are in the angle of 180 degrees. After the medical staff is separated from the dead point position, the medical staff only needs to push the first connecting rod 31 or the second connecting rod 32 to destroy the dead point position, and the extension arm and the support arm can rotate relatively within an angle smaller than 180 degrees. When the supporting state is recovered, the extension arm and the support arm only need to be rotated to an angle of 180 degrees, so that the quadrilateral structure enters the dead point position, and the rubber dam is supported. The limitation is within 0 to 180 degrees, so that the extension arm and the support arm can be effectively prevented from over rotating, and the extension arm and the support arm are prevented from moving towards one side attached to the face to influence the operation of medical staff.

In one embodiment, as shown in fig. 7, a pipette holder assembly 14 and a pipette 15 disposed on the pipette holder assembly 14 are disposed on the first holder body 10, the pipette 15 being used to absorb oral fluid. When medical personnel carry out the operation to the tooth, can produce the waste liquid, generally need another staff to assist, draw the waste liquid and discharge. This embodiment allows for a single doctor's independent operation of the pipette holder assembly 14, and the pipette holder assembly 14 can automatically aspirate waste fluid when performing related operations on the tooth.

In one embodiment, as shown in fig. 7, the pipette support assembly 14 includes a flexible sleeve 141, the flexible sleeve 141 being mounted on the first support body 10 with the middle of the flexible sleeve 141 being used to pass the pipette 15. The flexible sleeve 141 is advantageously deformable under force so as to facilitate adjustment of the aspiration position of the aspiration tubing 15.

In one embodiment, as shown in fig. 7, the pipette support assembly 14 further includes a clamp 142 for removably mounting the flexible sleeve 141 to the first support body 10 so that the pipette support assembly 14 can be separated from the first support body 10 to facilitate disassembly and cleaning of the components when the pipette support assembly 14 is not needed.

In one embodiment, as shown in fig. 1-7, the first arm 12, the base beam 11, the second arm 13, the first extension arm 21 and the second extension arm 22 are provided with protrusions 16 for hooking the rubber dam, so as to facilitate hooking the rubber dam and prevent the rubber dam from being removed from the rubber dam holder during use.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rubber dam holder, comprising:

the first support frame body (10) comprises a bottom beam (11), a first support arm (12) and a second support arm (13) which are positioned at two ends of the bottom beam (11), and the first support arm (12), the bottom beam (11) and the second support arm (13) form a U-shaped frame;

a second bracket body (20) comprising a first extension arm (21) hinged to the first support arm (12) and a second extension arm (22) hinged to the second support arm (13);

the second stand body (20) is configured in a supporting state and a folded state with respect to the first stand body (10): in the supporting state, the second bracket body (20) and the first bracket body (10) support and unfold the rubber dam together; in the folded state, the second stand body (20) is rotatable with respect to the first stand body (10).

2. Rubber dam holder according to claim 1, characterized in that said first extension arm (21) and said second extension arm (22) are two independent parts, said first extension arm (21) being hinged to the end of said first arm (12); the second extension arm (22) is hinged to the end of the second support arm (13); the first extension arm (21) and the second extension arm (22) are the same in length and the same in the direction of their hinge rotation.

3. Rubber dam holder according to claim 2, characterized in that said second frame body (20) further comprises an extension beam (23), said extension beam (23) connecting said first extension arm (21) and said second extension arm (22) for simultaneously rotating said first extension arm (21) about the end of said first arm (12) and said second extension arm (22) about the end of said second arm (13).

4. Rubber dam frame according to any of claims 1-3, wherein a first limit lock (30) is installed at the joint of the first extension arm (21) and the first arm (12), the first limit lock (30) comprises a locked state and an unlocked state, when the first limit lock (30) is in the locked state, the first extension arm (21) and the first arm (12) form a predetermined angle and the joint cannot rotate, when the first limit lock (30) is in the unlocked state, the joint of the first extension arm (21) and the first arm (12) can rotate within a predetermined angle range, and/or

The second limiting lock (40) is installed at the hinged position of the second extension arm (22) and the second support arm (13), the second limiting lock (40) comprises a locking state and an unlocking state, when the second limiting lock (40) is in the locking state, a preset included angle is formed between the second extension arm (22) and the second support arm (13), the hinged position cannot rotate, when the second limiting lock (40) is in the unlocking state, the hinged position of the second extension arm (22) and the second support arm (13) can rotate within a preset angle range.

5. Rubber dam holder according to claim 4, characterized in that said first limit lock (30) and said second limit lock (40) are structurally identical;

the first limit lock (30) comprises a first connecting rod (31) and a second connecting rod (32), the first connecting rod (31) comprises a first end and a second end, the second connecting rod (32) also comprises a first end and a second end, the first end of the first connecting rod (31) is hinged with the first end of the second connecting rod (32), the second end of the first connecting rod (31) is hinged with the first support arm (12), the second end of the second connecting rod (32) is hinged with the first extension arm (21), and the first connecting rod (31), the second connecting rod (32), the first support arm (12) and the first extension arm (21) form a four-bar mechanism;

when the first limit lock (30) is in a locked state, the four-bar mechanism is in a dead point position; when the first limit lock (30) is in an unlocked state, the four-bar mechanism is separated from a dead point position.

6. Rubber dam holder according to claim 5, characterized in that the angle formed by said first extension arm (21) and said first arm (12) is in the range of 0 to 180 degrees, and the angle formed by said second extension arm (22) and said second arm (13) is in the range of 0 to 180 degrees.

7. Rubber dam holder according to claim 6, characterized in that said first limit lock (30) forms an angle of 180 degrees with said four-bar linkage formed by said first arm (12) and said first extension arm (21) when said four-bar linkage is in a dead point position, and said first limit lock (30) forms an angle of less than 180 degrees with said four-bar linkage formed by said first arm (12) and said first extension arm (21) when said four-bar linkage formed by said first arm (12) and said first extension arm (21) is out of a dead point position;

when the four-bar mechanism formed by the second limiting lock (40), the second support arm (13) and the second extension arm (22) is located at a dead point position, an included angle between the second support arm (13) and the second extension arm (22) is 180 degrees, and when the four-bar mechanism formed by the second limiting lock (40), the second support arm (13) and the second extension arm (22) is separated from the dead point position, the included angle between the second support arm (13) and the second extension arm (22) is less than 180 degrees.

8. Rubber dam holder according to any of claims 1-3, characterized in that a pipette holder assembly (14) and a pipette (15) arranged on the pipette holder assembly (14) are arranged on the first holder body (10), the pipette (15) being intended for taking up oral liquid.

9. Rubber dam holder according to claim 8, characterized in that the pipette holder assembly (14) comprises a flexible sleeve (141), the flexible sleeve (141) being mounted on the first holder body (10), the middle of the flexible sleeve (141) being provided for the penetration of the pipette (15).

10. A rubber dam holder according to claim 9, wherein the pipette rack assembly (14) further comprises a clamp (142), the clamp (142) being used to removably mount the flexible sleeve (141) on the first rack body (10).