CN211182732U

CN211182732U - Anti-loosening sleeve, electric connection assembly and ventricular assist system

Info

Publication number: CN211182732U
Application number: CN201922163001.9U
Authority: CN
Inventors: 谢端卿; 余顺周
Original assignee: Shenzhen Core Medical Technology Co Ltd
Current assignee: Shenzhen Core Medical Technology Co Ltd
Priority date: 2019-12-05
Filing date: 2019-12-05
Publication date: 2020-08-04
Anticipated expiration: 2029-12-05

Abstract

The utility model provides an anti-loosening sleeve, electric connection assembly and ventricular assist system, the anti-loosening sleeve can be established on first connector and the second connector of electricity connection, the anti-loosening sleeve includes first cover lamella and second cover lamella, first cover lamella with second cover lamella can splice in order to form a sleeve structure, sleeve structure can overlap and establish the electricity and connect first connector with on the second connector, and shield at least the rotatable parts of second connector. This locking cover forms the sleeve structure through splicing first cover lamella and second cover lamella for locking cover cup joints on first connector and second connector, and shields the rotatable parts of second connector, thereby has played the guard action to the rotatable parts, prevents that the rotatable parts from receiving external colliding with and taking place to rotate, thereby has reduced the unexpected pine of first connector and second connector and has taken off the risk.

Description

Anti-loosening sleeve, electric connection assembly and ventricular assist system

Technical Field

The utility model belongs to the technical field of the connector accessory, especially, relate to an anti-loosening cover, electric connection component and ventricular assist system.

Background

Usually, the electric connection between connector and the connector is realized through the mode of pegging graft usually, and in order to prevent that two connectors from taking off, the draw-in groove has usually been seted up on one of two connectors, installs rotating member on another, be equipped with on the rotating member with draw-in groove complex protruding, with two connectors grafting back, through rotating its rotating member, protruding and draw-in groove block to reduce the pine of connector and take off the risk. However, the rotating member is susceptible to rotation by external forces, and still risks unintentional disengagement of the two connectors.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an anti-loosening cover, electric connection component and ventricle auxiliary system, this anti-loosening cover can reduce the unexpected pine of the connector of pegging graft and take off the risk.

The utility model discloses a realize like this, a locking cover can establish on first connector and the second connector of electricity connection, locking cover includes first cover lamella and second cover lamella, first cover lamella with second cover lamella can splice in order to form a sleeve structure, sleeve structure can overlap and establish the electricity and be connected first connector with on the second connector, and shield at least the rotating member of second connector.

In one embodiment, the sleeve structure can cover a rotating component of the second connector, a part of the first connector, and a part of the electrical connection body of the second connector, the sleeve structure has a first through hole for the first connector to pass through and a second through hole for the second connector to pass through, an edge of the first through hole can abut against the first connector, and an edge of the second through hole can abut against the electrical connection body, so as to prevent the sleeve structure from sliding on the electrically connected first connector and the electrically connected second connector.

In one embodiment, a notch groove is formed in an edge of at least one of the first sleeve flap and the second sleeve flap, and when the first sleeve flap and the second sleeve flap are spliced to form the sleeve structure, the notch groove is located at an end of the sleeve structure and at an edge where the first sleeve flap and the second sleeve flap are close to each other.

In one embodiment, a clamping groove is formed in the first sleeve flap, a buckle capable of being clamped with the clamping groove is arranged on the second sleeve flap, and the buckle is clamped with the clamping groove so that the first sleeve flap and the second sleeve flap are spliced to form the sleeve structure.

In one embodiment, the number of the clamping grooves is multiple, the multiple clamping grooves are respectively close to two ends of the first sleeve flap in the axial direction of the sleeve structure, and the size of the clamping groove close to one end of the first sleeve flap is larger than that of the clamping groove close to the other end of the first sleeve flap;

in one embodiment, the number of the corresponding buckles is multiple, the plurality of buckles are respectively close to two ends of the second sleeve petal in the axial direction of the sleeve structure, the buckle on one end of the second sleeve petal is matched with the clamping groove with a larger size, and the buckle on the other end of the second sleeve petal is matched with the clamping groove with a smaller size.

In one embodiment, the second sleeve flap is provided with a limiting protrusion, and the limiting protrusion can be accommodated in a groove on the electrical connection body of the first connector or the second connector and can be abutted against two opposite side walls of the groove to prevent the sleeve structure from rotating relative to the first connector and the second connector.

In one embodiment, the second sleeve flap is provided with a positioning groove, the first sleeve flap is provided with a positioning protrusion, and when the first sleeve flap and the second sleeve flap are spliced, the positioning protrusion is partially accommodated in the positioning groove.

In one embodiment, an alignment groove is formed in an inner wall of the first sleeve flap and is disposed along an edge of the first sleeve flap, an alignment edge is formed in the second sleeve flap and is disposed along an edge of the second sleeve flap, when the first sleeve flap and the second sleeve flap are spliced, the alignment edge is accommodated in the alignment groove, and an outer surface of the alignment edge is attached to a groove wall of the alignment groove.

The utility model also provides an electric connection assembly, include:

the first connector is provided with a clamping groove, and the clamping groove is provided with a guide part and a clamping part communicated with the guide part;

the second connector comprises an electric connecting body and a rotating part which is rotatably connected with the electric connecting body, the electric connecting body can be inserted into the first connector, a clamping bulge which can be clamped with the clamping part is arranged on the rotating part, and the clamping bulge can slide to the clamping part from the guide part; and

an anti-loosening sleeve as described above.

The utility model provides a ventricular assist system again, include:

the blood pump is provided with a first connector, the first connector is provided with a clamping groove, and the clamping groove is provided with a guide part and a clamping part communicated with the guide part;

the external controller is provided with a second connector, the second connector comprises an electric connecting body and a rotating part which is rotatably connected with the electric connecting body, the electric connecting body can be inserted into the first connector, a clamping bulge which can be clamped with the clamping part is arranged on the rotating part, and the clamping bulge can slide to the clamping part from the guide part; and

an anti-loosening sleeve as described above.

The technical effects of the utility model are that: through forming sleeve structure with first cover lamella and second cover lamella concatenation for the anti-loosening cover cup joints on first connector and second connector, and shields the rotatable parts of second connector, thereby has played the guard action to the rotatable parts, prevents that the rotatable parts from receiving external colliding with and taking place to rotate, thereby has reduced the unexpected pine of first connector and second connector and has taken off the risk.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a three-dimensional structure diagram of an anti-loose sleeve according to an embodiment of the present invention, wherein the anti-loose sleeve is sleeved on a first connector and a second connector;

FIG. 2 is an exploded view of the anti-loosening sleeve shown in FIG. 1;

fig. 3 is a perspective view of a first connector in an electrical connection assembly according to an embodiment of the present invention.

Description of reference numerals:

10. a first set of petals; 101. 102, a first limit groove; 103. a card slot; 104. a positioning groove; 11. positioning the projection; 20. a second set of petals; 201. 202, a second limit groove; 203. positioning a groove; 204. a notch groove; 21. buckling; 22. a limiting bulge; 23. aligning edges; 31. a first through hole; 32. a second through hole; 91. a first connector; 911. a clamping groove; 9111. a guide portion; 9112. an engaging portion 92 and a second connector; 920. a groove; 921. a rotating member; 922. the body is electrically connected.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

Referring to fig. 1 and 2, the first connector 91 is electrically connected to the second connector 92 after being plugged, the rotating member 921 is sleeved on the end of the second connector 92, and the rotating member 921 is screwed to fixedly connect the first connector 91 to the second connector 92 to prevent the first connector 91 and the second connector 92 from loosening, but the rotating member 921 is easily knocked by the outside to rotate in the opposite direction, so that the first connector 91 and the second connector 92 are connected to loosen. In order to solve the problem, the utility model provides an anti-loose sleeve, this anti-loose sleeve can overlap and locate outside the rotating part 921. In this embodiment, the first connector 91 may be a pump body connector of the ventricular assist device and the second connector 92 may be a connector of the controller thereof, or the first connector 91 may be a connector of the controller and the second connector 92 may be a connector of the pump body.

Referring to fig. 1 and 2, the anti-loose sleeve includes a first sleeve flap 10 and a second sleeve flap 20, the first sleeve flap 10 and the second sleeve flap 20 can be spliced to form a sleeve structure, and the sleeve structure can be sleeved on the electrically connected first connector 91 and the electrically connected second connector 92 and shield the rotating member 921 of the second connector 92. Specifically, in the illustrated embodiment, the sleeve structure can shield a portion of the first connector 91 and a portion of the second connector 92 from electrically connecting the body 922 and the rotating member 921. Specifically, the first sleeve flap 10 and the second sleeve flap 20 are engaged with each other on two radial sides of the rotating member 921 to wrap the rotating member 921. The sleeve structure is provided with an accommodating cavity. The receiving cavity can receive portions of the first connector 91 and the second connector 92 to electrically connect the body 922 and the rotating member 921.

Specifically, the sleeve structure has a first through hole 31 for the first connector 91 to pass through and a second through hole 32 for the second connector 92 to pass through, the edge of the first through hole 31 can be abutted with the first connector 91, and the edge of the second through hole 32 can be abutted with the electrical connection body 922 to prevent the sleeve structure from sliding on the electrically connected first connector 91 and second connector 92, so that the sleeve structure slides in the plugging direction of the first connector 91 and the second connector 92 to ensure that the rotating part 921 is always located in the accommodating cavity and is not exposed outside the release sleeve. More specifically, the first through hole 31 and the second through hole 32 are located at two axial ends of the sleeve structure, the first through hole 31 and the second through hole 32 are disposed oppositely and communicated with the accommodating cavity, the first connector 91 is disposed through the first through hole 31, the hole wall of the first through hole 31 can prevent the first connector 91 from being separated from the accommodating cavity in a direction away from the second connector 92, the electric connection body 922 of the second connector 92 is disposed through the second through hole 32, and the hole wall of the second through hole 32 can prevent the second connector 92 from being separated from the accommodating cavity in a direction away from the first connector 91.

The utility model discloses a form sleeve structure with the concatenation of first cover lamella 10 and second cover lamella 20, the rotating part 921 is shielded by the cover that loosens, and the locking cover plays the guard action to rotating part 921 promptly, prevents that rotating part 921 from receiving external colliding with and taking place to rotate to the accident pine that has reduced first connector 91 and second connector 92 takes off the risk.

Referring to fig. 2, in the illustrated embodiment, the first sleeve flap 10 has a first receiving groove, the second sleeve flap 20 has a second receiving groove, two ends of the first sleeve flap 10 have a first limiting groove 101 and a first limiting groove 102, two ends of the second sleeve flap 20 have a second limiting groove 201 and a second limiting groove 202, respectively, when the first sleeve flap 10 and the second sleeve flap 20 are spliced, the first receiving groove and the second receiving groove form a receiving cavity together, the first limiting groove 101 and the second limiting groove 201 form a first through hole 31 together, and the first limiting groove 102 and the second limiting groove 202 form a second through hole 32 together. In other words, the first through hole 31 and the second through hole 32 are formed by splicing the first sleeve flap 10 and the second sleeve flap 20.

Referring to fig. 1 and 2, in order to facilitate the operator to detach the first sleeve flap 10 and the second sleeve flap 20, a notch groove 204 is formed on an edge of at least one of the first sleeve flap 10 and the second sleeve flap 20, and when the first sleeve flap 10 and the second sleeve flap 20 are spliced to form a sleeve structure, the notch groove 204 is located on an edge where the first sleeve flap 10 and the second sleeve flap 20 are close to each other, and is preferably located at an end of the sleeve structure. In this embodiment, the notch groove 204 is opened in the second set of petals 20, and when the first set of petals 10 is spliced with the second set of petals 20, the notch groove 204 provides an evasion position for an operator, so that the operator can apply force from the notch groove 204 to the groove wall of the notch groove 204 and the edge of the first set of petals 10 respectively to break the first set of petals 10 and the second set of petals 20. In other embodiments, the notch groove 204 may be formed on the first and

second petals

10 and 20 at the same time, and one or more notches may be formed on the first and

second petals

10 and 20, respectively.

Referring to fig. 2, in the present embodiment, the second sleeve flap 20 is provided with a positioning groove 203, the first sleeve flap 10 is provided with a positioning protrusion 11, and when the first sleeve flap 10 is spliced with the second sleeve flap 20, the positioning protrusion 11 is partially received in the positioning groove 203. Specifically, the positioning groove 203, the second limiting groove 201 and the second limiting groove 202 are arranged at intervals, the positioning groove 203 is located at the edge of the second sleeve flap 20, and the positioning protrusion 11 is located at the edge of the first sleeve flap 10. When the first sleeve flap 10 and the second sleeve flap 20 are spliced, the positioning groove 203 and the positioning protrusion 11 are aligned to realize the rapid positioning of the first sleeve flap 10 and the second sleeve flap 20. In other embodiments, the positioning protrusion 11 can be disposed on the second sleeve 20, and the positioning groove 203 is disposed on the first sleeve 10.

When the sleeve structure is sleeved on the electrically connected first connector 91 and second connector 92, a gap is formed between the cavity wall of the accommodating cavity and the rotating part 921 to prevent the rotating part 921 from rotating due to the rotation of the anti-loose sleeve. The first connector 91 and the second connector 92 are generally horn-shaped structures with circular cross sections, and are arranged gradually expanding towards the interface direction, and the anti-loose sleeve is preferably in a fusiform column shape so as to be matched with the first connector 91 and the second connector 92 which are plugged.

In this embodiment, referring to fig. 2, the first sleeve flap 10 is provided with a slot 103, the second sleeve flap 20 is provided with a buckle 21 capable of being fastened with the slot 103, and the buckle 21 is fastened with the slot 103 so that the first sleeve flap 10 and the second sleeve flap 20 are spliced to form a sleeve structure. The first sleeve petal 10 and the second sleeve petal 20 can be spliced and form a sleeve structure when the buckle 21 is clamped with the clamping groove 103, so that quick connection is realized. It is understood that the card slot 103 may be one or more card slots 103, and the corresponding card 21 is one or more card slots.

Optionally, the slot 103 is disposed on a slot wall of the receiving slot. Like this buckle 21 need stretch into the storage tank in be connected with draw-in groove 103, and first lamella 10 has played the guard action to buckle 21, prevents it because receive external world and collide with and break.

Referring to fig. 1 and 2, in the present embodiment, the locking groove 103 penetrates through the inner and outer surfaces of the first sleeve flap 10, so as to facilitate the processing of the first sleeve flap 10.

In this embodiment, there are two slots 103, the two slots 103 are respectively close to two axial ends of the first sleeve 10, the two slots 103 have different sizes, and correspondingly, the two buckles 21 are provided and correspond to the two slots 103 in position, the larger-sized buckle 21 is adapted to the larger-sized slot 103, the smaller-sized buckle 21 is adapted to the smaller-sized slot 103, and the two buckles 21 are adapted to the smaller-sized slot 103, so that the sizes of the two buckles 21 and the two slots 103 correspond to each other, so that an operator can distinguish the installation direction, and the large-sized buckle 21 and the large-sized slot 103 are engaged with each other, and the small-sized buckle 21 and the small-sized slot 103 are engaged.

Referring to fig. 2, in the illustrated embodiment, the second sleeve 20 is provided with a limiting protrusion 22, and the limiting protrusion 22 can be accommodated in a groove 920 on an electrical connection body 922 of the first connector 91 or the second connector 92, and can abut against two opposite side walls of the groove 920 to prevent the sleeve structure from rotating relative to the first connector 91 and the second connector 92. When the first connector 91 or the second connector 92 is manufactured, for the convenience of demolding and the like, the groove 920 is formed in the periphery of the electric connection body 922, the groove 920 extends along the circumferential direction of the electric connection body 922 and is arc-shaped, and when the limiting protrusion 22 is accommodated in the groove 920, the limiting protrusion 22 can abut against the side walls of the two ends of the groove 920 in the extending direction, that is, the length of the limiting protrusion 22 in the extending direction is approximately matched with the length of the limiting protrusion 22 in the extending direction, so that the sleeve structure is prevented from rotating relative to the first connector 91 and the second connector 92, and thus, the rotating component 921 cannot be loosened due to the rotation of the sleeve structure, and the connection stability of the connector anti-loose sleeve is improved. Preferably, two side walls of the limiting protrusion 22 in the axial direction of the sleeve structure abut against two groove walls of the groove 920 in the axial direction of the sleeve structure to further limit the sleeve structure from moving in the axial direction relative to the rotating member 921.

It should be noted that the above-mentioned manner is not limited to the prevention of the sleeve structure from rotating relative to the first connector 91 and the second connector 92, for example, in another embodiment, the cavity wall of the accommodating cavity is attached to the outer wall of the first connector 91 and the second connector 92, that is, the anti-loose sleeve tightens the first connector 91 and the rotating member 921 thereof, so as to fix the relative position of the rotating member 921 and the body of the first connector 91, and prevent the rotating member 921 from rotating relative to the first connector 91.

The inner wall of the first sleeve flap 10 is provided with a positioning groove 104 arranged along the edge of the first sleeve flap 10, the second sleeve flap 20 is provided with a positioning edge 23 arranged along the edge of the second sleeve flap 20, when the first sleeve flap 10 and the second sleeve flap 20 are spliced, the positioning edge 23 is accommodated in the positioning groove 104, and the outer surface of the positioning edge 23 is attached to the groove wall of the positioning groove 104. The arrangement of the alignment edge 23 and the alignment groove 104 facilitates the alignment of the first sleeve flap 10 and the second sleeve flap 20, and can limit the radial movement of the two, thereby balancing the stress acting on the buckle 21.

The utility model discloses still provide an electric connection assembly, including the anti-loosening cover that each above-mentioned embodiment provided, this anti-loosening cover is the same with the anti-loosening cover structural feature in each embodiment, and the effect played is also the same, and this is not repeated here.

Referring to fig. 3, the electrical connection assembly further includes a first connector 91 and a second connector 92. The first connector 91 is provided with an engagement groove 911, and the engagement groove 911 has a guide portion 9111 and an engagement portion 9112 communicating with the guide portion 9111. The second connector 92 includes an electrical connection body 922 and a rotation component 921 rotationally connected to the electrical connection body 922, the electrical connection body 922 can be plugged with the first connector 91, a fastening protrusion capable of being fastened with the fastening portion 9112 is disposed on the rotation component 921, the fastening protrusion can slide to the fastening portion 9112 from the guide portion 9111, the guide portion 9111 extends along the axial direction of the first connector 91, the fastening portion 9112 extends along the circumferential direction of the first connector 91 and is spaced from the interface of the first connector 91, so when the card and the protrusion slide to the fastening portion 9112, the groove wall of the fastening portion 9112 can limit the second connector 92 to move away from the first connector 91, and a limiting effect is further achieved.

The present invention further provides a ventricular assist system, which comprises the anti-loosening sleeve provided in each of the above embodiments, wherein the anti-loosening sleeve has the same structural characteristics as the anti-loosening sleeve in each of the above embodiments, and the functions of the anti-loosening sleeve are the same, which are not repeated herein.

The ventricular assist system further includes a blood pump and an external controller, the blood pump has a first connector 91, and referring to fig. 3, the first connector 91 is provided with an engagement groove 911, and the engagement groove 911 has a guide portion 9111 and an engagement portion 9112 communicating with the guide portion 9111; the external controller has a second connector 92, the second connector 92 includes an electrical connection body 922 and a rotation member 921 rotatably connected to the electrical connection body 922, the electrical connection body 922 can be inserted into the first connector 91, a locking protrusion engageable with the locking portion 9112 is provided on the rotation member 921, and the locking protrusion can slide from the guide portion 9111 to the locking portion 9112.

The foregoing is only a preferred embodiment of the present invention, and the technical principles of the present invention have been specifically described, and the description is only for the purpose of explaining the principles of the present invention, and should not be construed as limiting the scope of the present invention in any way. Any modifications, equivalents and improvements made within the spirit and principles of the invention and other embodiments of the invention without the creative effort of those skilled in the art are intended to be included within the protection scope of the invention.

Claims

1. The utility model provides an anti-loosening sleeve, can overlap and establish on first connector and the second connector of electricity connection, a serial communication port, anti-loosening sleeve includes first cover lamella and second cover lamella, first cover lamella with second cover lamella can splice in order to form a sleeve structure, the electric connection can be established to sleeve structure first connector with on the second connector, and shield at least the rotating member of second connector.

2. The anti-loosening sleeve as claimed in claim 1, wherein the sleeve structure covers a rotating part of the second connector, a part of the first connector and a part of the electrical connection body of the second connector, the sleeve structure has a first through hole for the first connector to pass through and a second through hole for the second connector to pass through, an edge of the first through hole can abut against the first connector, and an edge of the second through hole can abut against the electrical connection body, so as to prevent the sleeve structure from sliding on the electrically connected first connector and second connector.

3. The anti-loosening sleeve of claim 1 wherein at least one of the first and second sleeve segments has a notched groove formed in an edge thereof, and wherein the notched groove is located at an edge where the first and second sleeve segments are adjacent to each other when the first and second sleeve segments are joined to form the sleeve structure.

4. The anti-loosening sleeve according to claim 1, wherein a locking groove is formed in the first sleeve flap, a buckle capable of being locked with the locking groove is formed in the second sleeve flap, and the buckle is locked with the locking groove so that the first sleeve flap and the second sleeve flap are spliced to form the sleeve structure.

5. The anti-loosening sleeve according to claim 1, wherein the plurality of locking grooves are provided near both ends of the first sleeve flap in the axial direction of the sleeve structure, respectively, and the locking grooves near one end of the first sleeve flap have a size larger than that of the locking grooves near the other end of the first sleeve flap;

the plurality of buckles are correspondingly arranged, the plurality of buckles are respectively close to two ends, in the axial direction, of the second sleeve petal, the buckles on one end of the second sleeve petal are matched with the clamping grooves with larger sizes, and the buckles on the other end of the second sleeve petal are matched with the clamping grooves with smaller sizes.

6. The anti-loosening sleeve according to claim 1, wherein the second sleeve flap has a limiting protrusion, and the limiting protrusion can be received in a groove of the electrical connection body of the first connector or the second connector and can abut against two opposite side walls of the groove to prevent the sleeve structure from rotating relative to the first connector and the second connector.

7. The anti-loosening sleeve according to claim 1, wherein the second sleeve segment defines a positioning groove, the first sleeve segment defines a positioning protrusion, and the positioning protrusion is partially received in the positioning groove when the first sleeve segment is engaged with the second sleeve segment.

8. The anti-loosening sleeve according to claim 1, wherein an alignment groove is formed on an inner wall of the first sleeve flap along an edge of the first sleeve flap, an alignment edge is formed on the second sleeve flap along an edge of the second sleeve flap, when the first sleeve flap and the second sleeve flap are spliced, the alignment edge is accommodated in the alignment groove, and an outer surface of the alignment edge is attached to a groove wall of the alignment groove.

9. An electrical connection assembly, comprising:

an anti-loosening sleeve according to any one of claims 1 to 8.

10. A ventricular assist system, comprising:

an anti-loosening sleeve according to any one of claims 1 to 8.