CN116158825A

CN116158825A - Connector and spinal correction system

Info

Publication number: CN116158825A
Application number: CN202310452910.2A
Authority: CN
Inventors: 王鹏; 张剑宁; 赵彦涛; 高谋; 程岗
Original assignee: First Medical Center of PLA General Hospital
Current assignee: First Medical Center of PLA General Hospital
Priority date: 2023-04-25
Filing date: 2023-04-25
Publication date: 2023-05-26
Anticipated expiration: 2043-04-25
Also published as: CN116158825B

Abstract

The invention discloses a connector and a spinal correction system, the connector comprises: a first sleeve, the first rod-like member being fixedly connected to a first end of the first sleeve; the second sleeve body is provided with a second end facing the second end of the first sleeve body; the outer screw sleeve is sleeved outside the first sleeve body and the second sleeve body at the same time, and the outer screw sleeve is in threaded fit with the first sleeve body and the second sleeve body; the end part is arranged at the end part of the second rod-shaped part, the end part is configured to be provided with a spherical surface, a step surface is formed between the end part and the second rod-shaped part, and a spherical cavity matched with the end part is configured in a port of the first end of the second sleeve body; the spiral cover is in threaded connection with the first end of the second sleeve body, the radial inner side of the spiral cover is provided with a pressing sleeve, and the pressing sleeve is tightly abutted against or far away from the step surface by screwing the spiral cover; and the two ends of the elastic component are fixedly connected to the first rod-shaped component and the end component respectively.

Description

Connector and spinal correction system

Technical Field

The present invention relates to an apparatus for treating the spinal column, and more particularly to a connector for correcting the spinal column and a spinal correction system.

Background

It is known that severely deformed spine (e.g., lateral curvature spine, reverse posterior arch) is often surgically corrected, and surgical implantation instruments such as corrective systems (devices) are used to correct the spine, which generally include: a rod-like member for reconstructing a spinal curve and a plurality of anchors connected in series to the rod-like member, the anchors including a retaining member and bone screws formed on the retaining member for threading into the spine to cooperate with the rod-like member to form a support correction system for the spine.

It is easy to understand that the rod-like members are intended to serve as a support, and generally the rod-like members are not configured as absolute rigid members as a whole, because, on the one hand, a certain amount of activity is required for the spine and, on the other hand, stresses and bending moments generated inside the rod-like members due to positional changes of the spine and the anchors need to be eliminated by means of adaptive deformations. Thus, the rod-like member corresponding to a location of the human spine may need to be configured to be flexible for meeting spinal activity requirements or for relieving stress, bending moments of the rod-like member itself; the rod-like members corresponding to a location on the human spine may be configured to be rigid for actively limiting undesirable movement of the spine at that location (e.g., severe lateral curvature after correction, and not being expected to cause any movement during the initial stages after corrective surgery). To meet the above-described requirements, in the prior art, connectors for imparting flexibility to the rod-like member at the corresponding positions of the rod-like member are provided, for example, the connectors are configured as elastic members so as to impart flexibility.

However, as the correction progresses, the requirements for the rigid or flexible position of the rod-like member may change, especially in the later stages of the correction, i.e. in order to obtain a better correction effect, the rigid position of the rod-like member may be reconfigured to be more flexible and the flexible position of the rod-like member may be reconfigured to be more rigid. In particular, when a rigid position is required to be flexible, for example, after a severe lateral bending corresponding to the rigid position of a rod-like member is corrected to be close to a normal shape, it is generally required that the rod-like member corresponding to the position should have a certain degree of flexibility for making the position have a certain amount of activity, and thus, it is required to reconfigure the position to be flexible. In addition, certain locations of the spine may require the rod-like member to have the ability to be adjustable in length at that location, for example, in the later stages of correction, the rod-like member in the location where severe lateral bending is required to be configured from rigid to flexible while the rod-like member is required to be increased or decreased in length at that location, and reasons for such requirements may include, on the one hand, for cooperation with flexibility and, on the other hand, for relief of internal stresses.

However, most connectors in the prior art correction systems are only capable of holding the rod-shaped member in place in one of the above-described states, but not switching the rod-shaped member between two or three states, e.g. between rigidity, flexibility, length-adjustable.

In addition, to obtain a better correction effect, not only is it required that some positions of the rod-like members be arranged to be flexible, but also that the bending rigidity of the rod-like members in different directions be different, however, the connectors in the prior art do not allow the bending rigidity of the rod-like members in different directions to be different.

Disclosure of Invention

In view of the foregoing technical problems in the prior art, embodiments of the present invention provide a connector and a spinal correction system.

In order to solve the technical problems, the technical scheme adopted by the embodiment of the invention is as follows:

a connector, comprising:

a first sleeve having first and second ends in an axial direction, a first rod-like member fixedly connected to the first end of the first sleeve;

a second sleeve having first and second ends in an axial direction, the second sleeve being coaxially disposed with the first sleeve, the second end of the second sleeve being oriented toward the second end of the first sleeve;

the outer screw sleeve is sleeved outside the first sleeve body and the second sleeve body simultaneously, the outer screw sleeve is in threaded fit with the first sleeve body and the second sleeve body, and the external threads matched with the second sleeve body are opposite to the external threads matched with the first sleeve body in rotation direction, so that when the outer screw sleeve is screwed, the first sleeve body is close to or far away from the second sleeve body;

a head member disposed at an end of the second rod member, the head member being configured to have a spherical surface, a stepped surface being formed between the head member and the second rod member, a spherical cavity being disposed in a port of the first end of the second sleeve body to match the head member, the head member being located in the spherical cavity;

the screw cap is in threaded connection with the first end of the second sleeve body, a pressing sleeve is arranged on the radial inner side of the screw cap, and the pressing sleeve is tightly abutted against or far away from the step surface by screwing the screw cap;

and the elastic component is arranged in the first sleeve body and the second sleeve body, and two ends of the elastic component are respectively and fixedly connected to the first rod-shaped component and the end head component.

Preferably, the elastic component comprises a columnar body, and a first group of cutting grooves and a second group of cutting grooves are formed in the columnar body; the first group of the cutting grooves comprise two rows of first cutting grooves which are oppositely arranged on the outer peripheral surface of the columnar body and are axially arranged, and the second group of the cutting grooves comprise two rows of second cutting grooves which are oppositely arranged on the outer peripheral surface of the columnar body and are axially arranged; wherein:

the second cutting groove and the first cutting groove form 90 degrees in the circumferential direction of the columnar body;

the second slits and the first slits are alternately arranged in the axial direction of the columnar body;

the width of the first slit and the radial depth of the penetration into the columnar body are larger than the width of the second slit and the radial depth of the penetration into the columnar body, so that the bending rigidity of the elastic member against bending in the first slit direction is smaller than the bending rigidity against bending in the second slit direction.

Preferably, the elastic member includes:

the columnar body is provided with a plurality of sequentially arranged cutting grooves on the outer peripheral surface, and the plurality of cutting grooves are arranged so that the columnar body can be bent in all directions through the plurality of cutting grooves, and the bending rigidity of the columnar body against bending in all directions is the same; the outer peripheral surface of the columnar body is also provided with a plurality of linear storage holes uniformly distributed in the circumferential direction, each linear storage hole extends axially and penetrates through two ends of the columnar body, and the end part of each linear storage hole is provided with an end hole with a radial size larger than that of each linear storage hole;

the linear rods are configured into a spiral extending structure, the linear rods comprise a plurality of linear rods, the linear rods can be selectively arranged in the linear containing holes, two ends of each linear rod are connected with cylinders, and the cylinders are contained in the end holes;

the connecting parts comprise two connecting parts, the two connecting parts are respectively butted at two ends of the columnar body so as to limit the column body, and the first rod-shaped component and the end head component are respectively connected to the two connecting parts.

Preferably, the elastic component comprises a columnar body, and a central hole which is axially penetrated is formed in the middle of the columnar body; the columnar body is processed with a spiral groove which extends spirally and radially penetrates through the hole wall of the central hole, and the spiral groove constructs the columnar body into a spring structure, so that the bending rigidity of the elastic component against bending in all directions is the same.

Preferably, the elastic member is reciprocally bent and formed by an elastic strip such that the elastic member can be deformed only in a direction in which the elastic strip is bent.

Preferably, a limiting disc is fixed on the periphery of the first rod-shaped component, a gland is fixed at the first end of the first sleeve body, and the limiting disc is clamped between the gland and the first sleeve body.

Preferably, two ends of the elastic component are respectively connected with the first rod-shaped component and the end component through threads; the end piece is connected with the second rod-shaped piece through threads.

Preferably, the first sleeve body on one side of the outer screw sleeve and the second sleeve body on the other side of the outer screw sleeve are respectively sleeved with a locking nut for limiting the rotation of the outer screw sleeve and the outer peripheral surface of the first end of the first sleeve body is sleeved with a locking nut for limiting the rotation of the screw cap.

Preferably, a guide bush is formed at the second end of the second bush body, and the guide bush is inserted into the first bush body.

The invention also discloses a spinal correction system, comprising:

a rod-shaped member including at least a first rod-shaped member and a second rod-shaped member;

a holder including a holding member and a bone nail formed on the holding member, the holder being connected to the rod-shaped member through the holding member;

the connector is arranged between the first rod-shaped component and the second rod-shaped component.

Compared with the prior art, the connector and the spinal correction system provided by the embodiment of the invention have the beneficial effects that:

1. the connector can be provided at any desired position on the rod member for rigid, flexible and length adjustment, which connector enables adjustment of the rod member to the desired corresponding state, thereby avoiding the need to provide different types of connectors on the rod member for different requirements.

2. The connector provided by the invention can also perform corresponding function switching along with the change of the requirement on the same position of the rod-shaped component. For example, in the early correction stage, the rod-shaped member corresponding to the position of the severe lateral bending position needs to be in a rigid state, and in the later correction stage, the rod-shaped member corresponding to the position of the severe lateral bending position needs to be in a flexible state with a certain bending stiffness.

Drawings

Fig. 1 is a schematic diagram of an external structure of a connector according to the present invention.

Fig. 2 is a view showing the state of use of the connector of the present invention in which the elastic member provided in embodiment 1 is mounted (the end member is in a state locked by the cap).

Fig. 3 is a view showing the state of use of the connector of the present invention in which the elastic member provided in embodiment 1 is mounted (the end member is in a state released by the cap).

Fig. 4 is a front view of an elastic member provided in embodiment 1 of the present invention.

Fig. 5 is a view in the direction a of fig. 4.

Fig. 6 is a schematic structural view of the connector of the present invention mounted with the elastic member provided in embodiment 2.

Fig. 7 is a schematic perspective view of an elastic member according to embodiment 2 of the present invention.

Fig. 8 is an exploded perspective view of an elastic member provided in embodiment 2 of the present invention.

Fig. 9 is a front view of an elastic member provided in embodiment 3 of the present invention.

Fig. 10 is a front view of an elastic member provided in embodiment 4 of the present invention.

Fig. 11 is a view of the spinal correction system provided by the present invention in use.

In the figure:

10-a first sleeve; 20-a second sleeve; 21-a ball cavity; 22-a guide sleeve; 30-an outer screw sleeve; 40-end parts; 41-spherical surface; 42-step surface; 60-limiting plates; 70-screwing the cover; 71-pressing a stop sleeve; 80-capping; 91-a first locking nut; 92-a second lock nut; 93-a third lock nut; a 100-connector; 200-rod-shaped parts; 201-a first rod-shaped member; 202-a second rod-shaped member; 300-a holder; 301-a holding member; 302-bone nails; 1000-spinal column.

50-an elastic member; 51-a first set of slots; 511-a first incision; 52-a second set of slots; 521-second slots; 53-a columnar body.

A 50' -elastic member; a 51' -columnar body; 511' -a third slot; 512' -linear receiving hole; 5121' -end aperture; a 52' -linear rod; 521' -cylinder; 53' -connecting portion.

50 "-elastic means; 51 "-a cylindrical body; 52 "-helical groove.

50' ' ' -an elastic member; 51' ' ' -elastic panel.

Detailed Description

The present invention will be described in detail below with reference to the drawings and detailed description to enable those skilled in the art to better understand the technical scheme of the present invention.

As shown in fig. 11, an embodiment of the present invention discloses a connector 100 and a spinal correction system including the connector 100, the spinal correction system further including a rod member 200 and a plurality of anchors 300 connected in series to the rod member 200, the anchors 300 including a holding member 301 and bone screws 302 formed at the bottom of the holding member 301, the bone screws 302 for screwing into the spine of the rod member 200, the holding member 301 for receiving the rod member 200, whereby the anchors 300 form a connection with the rod member 200 and support the rod member 200.

The connector 100 of the present invention is configured to be positioned at a location where flexibility, flexibility/stiffness switching, length adjustability, and cushioning requirements are desired for the rod member 200, during initial and/or later stages of the orthotic system's setup.

The rod member 200 at which each connector 100 is located is divided into two sections, and the connector 100 is connected between the two sections, and the two sections may be referred to as a first rod member 201 and a second rod member 202.

As shown in fig. 1 to 3, the connector 100 includes: the first sleeve body 10, the second sleeve body 20, the outer thread sleeve 30, the end piece 40, the screw cap 70, and the pressing cap 80.

The first sleeve 10 has first and second ends in an axial direction, the second sleeve 20 is coaxial with the first sleeve 10, and the second end of the second sleeve 20 faces the second end of the first sleeve 10; the first sleeve body 10 and the second sleeve body 20 have outer peripheral surfaces with the same radial dimension, and external threads are formed on the outer peripheral surfaces of the first sleeve body 10 and the second sleeve body 20, but the rotation directions of the external threads are opposite. Preferably, the second end of the second sleeve body 20 is formed with a guide sleeve 22, and the guide sleeve 22 is inserted into the first sleeve body 10.

The outer screw sleeve 30 is simultaneously sleeved on the first sleeve body 10 and the second sleeve body 20, the outer screw sleeve 30 is matched with the outer threads of the first sleeve body 10 and the second sleeve body 20, and the outer circumferential surface of the outer screw sleeve 30 is configured into a structure for screwing an operation tool, for example, a hexagonal structure, so that the outer screw sleeve 30 can be screwed by the operation tool. Thus, when the outer screw 30 is screwed in one direction, the outer screw 30 moves the first and

second sleeve bodies

10 and 20 away from each other by screw engagement, and when the outer screw 30 is screwed in the other direction, the first sleeve body 10 approaches the second sleeve body 20.

From the above, the first sleeve body 10, the second sleeve body 20 and the outer screw sleeve 30 constitute a length-adjustable structure, and the structure can be regarded as being connected as a rigid body.

Preferably, the first sleeve body 10 of one side of the outer screw sleeve 30 is sleeved with the first locking nut 91, the second sleeve body 20 of the other side of the outer screw sleeve 30 is sleeved with the second locking nut 92, and after the length is adjusted by the outer screw sleeve 30, the outer screw sleeve 30 is fixed by screwing the first locking nut 91 and the second locking nut 92, so that the length is reliably defined.

The end of the first rod-shaped member 201 is fixed with a limiting disc 60, and the gland 80 is used for pressing the limiting disc 60 against the end face of the first end of the first sleeve 10, so that the limiting disc 60 is fixed, and the first rod-shaped member 201 is fixedly connected with the first sleeve 10. The limiting plate 60 can be pressed and fixed by screwing the flat post on the right side of the limiting plate 60 into the end part of the first rod-shaped component 201 through the stud as shown in fig. 2, which is beneficial to assembling the first rod-shaped component 201 and the first sleeve body 10, so that before the limiting plate 60 is installed on the end part of the first rod-shaped component 201, the gland 80 can be sleeved on the first rod-shaped component 201 in advance, after the gland 80 is sleeved on the first rod-shaped component 201, the limiting plate 60 is fixed by using the flat post, and then the flat post on the right side of the limiting plate 60 extends into the first sleeve body 10 from the first end of the first sleeve body 10, and finally the limiting plate 60 is fixed by using the gland 80.

The tip member 40 is provided at the end of the second rod member 202, and the tip member 40 may be detachably fixedly connected to the second rod member 202 by, for example, providing a stud on the tip member 40 and screwing the stud into the end of the second rod member 202.

The end piece 40 is configured to have two structural features: the first feature is that the outer circumferential surface of the tip member 40 is a spherical surface 41, and the second feature is that the connecting area of the tip member 40 and the second rod member 202 is formed with a stepped surface 42 facing the second rod member 202.

The second end of the second sleeve 20 has a ball cavity 21 formed in the end opening thereof to match the end member 40, and the end member 40 is positioned in the ball cavity 21, so that the end member 40 can swing in any direction when the end member 40 is not restrained.

The screw cap 70 is disposed at the first end of the second sleeve body 20, specifically, an external thread is formed on the outer circumference of the first end of the second sleeve body 20, and the screw cap 70 is matched with the external thread of the second sleeve body 20, so that the screw cap 70 can be made to be close to or far from the end part 40 by screwing the screw cap 70; the inner side of the cap 70 is formed with a pressing sleeve 71, and after the cap 70 is screwed to move the cap 70 in the direction of the tip member 40, the pressing sleeve 71 presses against the stepped surface 42 of the tip member 40 to restrict the tip member 40 from swinging, at this time, the cap 70 locks the tip member 40, and after the cap 70 is reversely screwed to move the cap 70 in the direction away from the tip member 40, the pressing sleeve 71 is separated from the stepped surface 42, and the tip member 40 is released by the cap 70 to be able to swing. Preferably, a third locking nut 93 is fitted over the external thread of the first end of the second housing 20, and the rotation of the cap 70 is restricted by screwing the third locking nut 93.

As is apparent from the above, when the head member 40 is locked by the screw cap 70, the head member 40 and the second rod member 202 are completely fixed, and at this time, the two rod members are configured as rigid bodies by the holder 300; and after the cap 70 is released from the end member 40, at this time, the two rod-like members are configured to be flexible by the holder 300.

The

elastic members

50, 50',50 ", 50'" are disposed inside the first and

second casings

10, 20, and both ends of the

elastic members

50, 50',50 ", 50'" are respectively connected to the flat posts extending into the first casing 10 and the end members 40 extending into the second casing 20, specifically, the ends of the flat posts and the end members 40 are screw-coupled to the ends of the

elastic members

50, 50',50 ", 50'" to form a detachable fixed connection with the

elastic members

50, 50',50 ", 50'". As such, the

elastic members

50, 50',50 ", 50'" serve to provide a certain bending stiffness to the rod-like members 200 when the two rod-like members are made flexible at the holder 300 by releasing the tip member 40 through the screw cap 70.

Based on the above-described structure of the holder 300 of the present invention, the connector 100 provided by the present invention has the following functions.

The first function:

the connector 100 has a function of switching the rod-shaped member 200 in the position between a rigid state and a flexible state.

Specifically, the rod-shaped member 200 is switched to the rigid state by having the cap 70 lock the tip member 40, and the rod-shaped member 200 is switched from the rigid state to the flexible state by having the cap 70 release the tip member 40, and at this time, the bending rigidity of the rod-shaped member 200 is provided by the

elastic members

50, 50',50 ", 50'".

It should be noted that:

1. the two concepts of stiffness being different from stiffness are that for a part, if the part is said to be a rigid part, the stiffness of the part is theoretically infinite, and if the part has a certain stiffness, it means that the part must not be a rigid part. In the present invention, all but the

elastic members

50, 50',50 ", 50'" are non-rigid members having rigidity, and are considered to be rigid members.

2. The relationship between stiffness, flexibility and rigidity is: the rigid part is inflexible, i.e. inflexible, and only the non-rigid part is flexible, whereas stiffness is a measure of the ability of the flexible part to bend against.

In the present invention, the

elastic members

50, 50',50 ", 50'" are used to give the rod-shaped member 200 having flexibility rigidity against bending for supporting the rod-shaped member 200.

The second function:

the connector 100 has a function of enabling length adjustment of the rod-like member 200 at the position.

Specifically, the length of the rod-shaped member 200 at the position can be adjusted by moving the first sleeve body 10 and the second sleeve body 20 away from or toward each other by screwing the outer screw sleeve 30 in the forward and reverse directions.

But important is that: because of the provision of the

elastic members

50, 50',50 ", 50'" and the tip member 40, the connector 100 still has the function of switching between the rigid state and the flexible state after the length adjustment is performed, and the adjustment of the two is independent of each other.

Third function:

the connector 100 also has an axial damping function with the rod-like member 200 in the resulting position. Specifically, the two sleeves are brought together by screwing the outer nut 30 until the ball cavity 21 at the first end of the second sleeve 20 is moved away from the end piece 40 and the press-stop sleeve 71 of the screw cap 70 is moved away from the end piece 40. In this way, the

elastic member

50, 50',50 ", 50'" is released, which

elastic member

50, 50',50 ", 50'" is responsible for relieving the axial impact.

The above-described functionality of the connector 100 of the present invention provides at least the following advantages for its application to spinal correction systems:

1. the connector 100 can be provided at any desired position on the rod member 200 for rigid, flexible and length adjustment, and the connector 100 can adjust the rod member 200 to a desired corresponding position, thereby avoiding the need to configure different types of connectors 100 on the rod member 200 for different requirements.

2. The connector 100 provided by the invention can also perform corresponding function switching according to the change of the requirement of the same position of the rod-shaped component 200. For example, in the early correction stage, the rod-shaped member 200 corresponding to the position where the severe lateral bending is required to be in a rigid state, and in the later correction stage, the rod-shaped member 200 corresponding to the position where the severe lateral bending is required to be in a flexible state with a certain bending stiffness, the connector 100 can adjust the rod-shaped member 200 to the corresponding state according to the required change.

The

resilient members

50, 50',50 ", 50'" are used to provide bending stiffness to the rod member 200 for maintaining the rod member 200 in a supporting spinal column when the rod member 200 in place is in a flexible state using the connector 100 described above. However, different locations of the spine require different flexural stiffness requirements for the rod-like member 200 in different directions at the corresponding locations. Four configurations of the

resilient members

50, 50',50 ", 50'" are provided by way of four embodiments, the four configurations of the

resilient members

50, 50',50 ", 50'" being different in terms of the flexural rigidity provided by the rod member 200.

Example 1

As shown in fig. 2 to 5, in the present embodiment, the elastic member 50 includes a cylindrical body 53, and a first set of slits 51 and a second set of slits 52 are formed on the cylindrical body 53; the first group of slots 51 includes two rows of first slots 511 arranged along the axial direction and arranged on the outer peripheral surface of the columnar body 53 oppositely, and the second group of slots 52 includes two rows of second slots 521 arranged along the axial direction and arranged on the outer peripheral surface of the columnar body 53 oppositely; the second slit 521 is 90 degrees from the first slit 511 in the circumferential direction of the columnar body 53; the second slits 521 are alternately arranged with the first slits 511 in the axial direction of the columnar body 53; the width S1 of the first slit 511 and the radial depth H1 of the penetration columnar body 53 are greater than the width S2 of the second slit 521 and the radial depth H2 of the penetration columnar body 53.

Since the width of the first slit 511 and the radial depth of the intruding columnar body 53 are larger than the width of the second slit 521 and the radial depth of the intruding columnar body 53, the bending rigidity of the elastic member 50 in the present embodiment against bending in the direction of the first slit 511 (the first direction shown in fig. 3) is made smaller than the bending rigidity against bending in the direction of the second slit 521 (the second direction shown in fig. 3). That is, the elastic member 50 provided in the present embodiment can make the bending rigidity of the rod-like member 200 different in two perpendicular directions.

The connector 100 having the elastic member 50 is suitable for mounting on a rod-like member 200 at a position corresponding to a position where the bending rigidity in the first direction is required to be small and the deflection is required to be large (the deflection is an amount of flexibility), and the bending rigidity in the second direction is required to be large and the deflection is small.

Example 2

As shown in fig. 6 to 8, in the present embodiment, the elastic member 51' includes: a columnar body 53, a linear rod 52', and a connecting portion 53'. The outer peripheral surface of the columnar body is provided with a plurality of slits arranged in order, and the slits are distinguished from the first slits 511 and the second slits 521 of embodiment 1, and may be referred to as third slits 511'. The arrangement of the plurality of third slits 511' is configured such that the columnar body 51' is capable of bending in each direction through the plurality of third slits 511' and the bending rigidity against bending in each direction is the same; the outer peripheral surface of the columnar body 51' is also provided with a plurality of linear containing holes 512' uniformly distributed in the circumferential direction, each linear containing hole 512' extends axially and penetrates through two ends of the columnar body 51', and the end part of each linear containing hole 512' is provided with an end hole 5121' with the radial size larger than that of each linear containing hole 512 '; the linear rod 52 'is configured in a spiral extension structure, so that the linear rod 52' has a telescopic characteristic and has definite bending stiffness in the same directions, the linear rod 52 'comprises a plurality of linear rods 52' which can be selectively arranged in some of the linear receiving holes 512', two ends of the linear rod 52' are connected with columns 521', and the columns 521' are received in the end holes 5121', so that the columns 521' at the two ends are received in the end holes 5121 'or are separated from the end holes 5121' by elongating the linear rod 52', and the linear rod 52' is disassembled; the connection portion 53 'includes two connection portions 53' respectively abutting on both ends of the columnar body 51', and the connection portion 53' is used for limiting the column 521 'on one hand to avoid that the column 521' is separated from the columnar body 51 'due to the fact that the column 521' is separated from the end hole 5121 'when the elastic member 50' is bent, and is used for connecting with the first rod-shaped member 201 and the end member 40 on the other hand.

The third slits 511 'may be arranged in various ways so that the flexural rigidity of the columnar body 51' itself in various directions is the same. For example, all third slots 511 'are configured to be the same in size (e.g., width, depth of cut) and all third slots 511' are uniformly arrayed axially and circumferentially. In the present embodiment, the third slits 511 'are arranged on the columnar body 51' by being uniformly arrayed in the spiral direction.

The purpose of arranging the columnar body 51' so that the bending rigidity in each direction is the same is to: so that the cylindrical body 51 'provides the elastic member 50' with an equal base bending stiffness in all directions. The linear rod 52' is used to provide additional bending stiffness to the elastic member 50' and the bending stiffness in the bending direction corresponding to a circumferential position can be adjusted by removing or adding the linear rod 52' to the circumferential position. In this way, the requirement for bending rigidity in more directions of the rod-like member 200 where the connector 100 is located can be satisfied by detaching or attaching the linear rod 52'.

The advantage of the elastic member 50' of the above structural feature is that:

1. the linear rods 52 'are removed or added to the resilient members 50' of the connectors 100 prior to implantation of the correction system in the spinal system of the human body, thereby enabling each connector 100 to meet the stiffness requirements of the rod-like member 200 in the corresponding location.

2. After implantation of the correction system into the spinal system of the human body, and after a certain period of treatment, the requirements for stiffness adjustment of the rod-like member 200 can be met by removing or adding the linear rod 52'.

Example 3

As shown in fig. 9, in the present embodiment, the elastic member 50″ includes a columnar body 51″ having a central hole formed in the middle thereof, the central hole being axially penetrated; the columnar body 51″ is processed with a spiral groove 52″ that extends spirally and radially penetrates through the wall of the center hole, and the spiral groove 52″ configures the columnar body 51″ into a spring structure so that the bending rigidity of the elastic member 50″ against bending in each direction is the same.

The elastic member 50″ provided in this embodiment is suitable for the case where the bending rigidity requirements in all directions are the same or the bending rigidity requirements in all directions are not high.

The elastic member 50″ provided in the present embodiment is also particularly suitable for the case where the rod-like member 200 frequently generates an axial impact, and the elastic member 50″ is particularly advantageous for relieving the impact.

Example 4

As shown in fig. 10, in the present embodiment, the elastic member 50' "is formed by reciprocally bending an elastic plate body so that the elastic member 50 '" can be deformed only in the direction in which the elastic strip 51' "is bent.

The elastic member 50' "provided in the present embodiment is suitable for a case where flexibility is required to be generated in a certain direction of the rod-like member 200 and flexibility is limited in a direction perpendicular to the certain direction.

The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, the scope of which is defined by the claims. Various modifications and equivalent arrangements of this invention will occur to those skilled in the art, and are intended to be within the spirit and scope of the invention.

Claims

1. A connector, comprising:

2. The connector of claim 1, wherein the resilient member comprises a cylindrical body having a first set of slots and a second set of slots formed therein; the first group of the cutting grooves comprise two rows of first cutting grooves which are oppositely arranged on the outer peripheral surface of the columnar body and are axially arranged, and the second group of the cutting grooves comprise two rows of second cutting grooves which are oppositely arranged on the outer peripheral surface of the columnar body and are axially arranged; wherein:

3. The connector of claim 1, wherein the elastic member comprises:

4. The connector according to claim 1, wherein the elastic member includes a columnar body, a central hole passing through axially is provided in a middle portion of the columnar body; the columnar body is processed with a spiral groove which extends spirally and radially penetrates through the hole wall of the central hole, and the spiral groove constructs the columnar body into a spring structure, so that the bending rigidity of the elastic component against bending in all directions is the same.

5. The connector according to claim 1, wherein the elastic member is reciprocally bent and shaped by an elastic slat so that the elastic member can be deformed only in a direction in which the elastic slat is bent.

6. The connector of claim 1, wherein a stopper plate is fixed to an outer periphery of the first rod-like member, a gland is fixed to a first end of the first sleeve, and the stopper plate is sandwiched between the gland and the first sleeve.

7. The connector according to claim 1, wherein both ends of the elastic member are screwed with the first rod-like member and the end member, respectively; the end piece is connected with the second rod-shaped piece through threads.

8. The connector of claim 1, wherein the first sleeve body on one side of the outer sleeve and the second sleeve body on the other side of the outer sleeve are respectively sleeved with a locking nut for limiting the rotation of the outer sleeve and a locking nut for limiting the rotation of the screw cap is sleeved on the outer peripheral surface of the first end of the first sleeve body.

9. The connector of claim 1, wherein the second end of the second sleeve body is formed with a guide sleeve that is inserted into the first sleeve body.

10. A spinal correction system, comprising:

the connector according to any one of claims 1 to 9, which is provided between the first rod-like member and the second rod-like member.