CN111700657B

CN111700657B - Centrum struts and shows device

Info

Publication number: CN111700657B
Application number: CN202010685666.0A
Authority: CN
Inventors: 丁琛; 杨毅; 刘浩
Original assignee: West China Hospital of Sichuan University
Current assignee: West China Hospital of Sichuan University
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2022-03-08
Anticipated expiration: 2040-07-16
Also published as: CN111700657A

Abstract

The invention discloses a centrum opening and exposing device, belongs to the field of medical devices, and provides an opener capable of opening and exposing a centrum and a soft tissue layer simultaneously, which comprises an opening adjusting rod, a left opening unit and a right opening unit; the left spreading unit further comprises a left spreading plate, and the right spreading unit further comprises a right spreading plate; the left connecting piece is of an L-shaped structure consisting of a first vertical section and a first horizontal section; the right connecting piece is of an L-shaped structure consisting of a second vertical section and a second horizontal section; the left opening plate is connected to the first vertical section, the right opening plate is connected to the second vertical section, and an opening cavity for opening the soft tissue layer is formed between the left opening plate and the right opening plate. The invention can realize the synchronous distraction of the soft tissue layer in the process of distracting the distance between the vertebral bodies and form the operation space required by the operation; and the number of used distractors, operation steps and the shielding of the operation space can be reduced, and the operation time can be effectively shortened.

Description

Centrum struts and shows device

Technical Field

The invention relates to the field of medical devices, in particular to a vertebral body expanding and exposing device.

Background

The vertebral body spreader is a device for spreading and fixing vertebral bodies when spine surgery such as cervical vertebra is performed. The traditional vertebral body distracter generally comprises an distraction adjusting rod and two distraction units at two ends, and at least one distraction unit is adjustable, so that the distance between the two distraction units can be adjusted, and the distraction effect on the vertebral body is realized. For example, the Chinese patent application number is: the structure of a vertebral body distractor disclosed in CN201621441277.9 (hereinafter referred to as document 1).

However, the existing vertebral body distracters are only used for distracting two vertebral bodies to fix the two vertebral bodies and the gap between the two vertebral bodies for operation operations, including nucleus pulposus excision, intervertebral space decompression, etc., the existing distracters can shield the narrow space of the operation operations to a certain extent, which is not favorable for the operation operations in the actual operation process, soft tissue layers such as muscles, blood vessels, trachea, skin, etc. covering the vertebral bodies need to be distracted and exposed, and at this time, corresponding tissue distracters specially used for distracting the soft tissue layers, generally corresponding bent plate-shaped or hook-shaped metal pieces, or clamps, etc., need to be additionally arranged. Moreover, due to the need of surgery, the opening member for opening the soft tissue layer needs to open the soft tissue such as skin and muscle further towards the periphery relative to the vertebral body, so as to expose part of the vertebral body for surgery; it is therefore desirable that the amount of distraction of the soft tissue layers be significantly greater than the amount of distraction of the vertebral bodies. Therefore, in the existing surgery, a vertebral body spreader for spreading the vertebral body and a tissue spreader for spreading soft tissue layers such as skin and muscle are arranged and matched for use. Therefore, the number of the distractors is increased, the surgical gap space of the target segment is shielded to a certain extent, the surgical operation is affected, the installation and distraction operations are required to be carried out twice, the surgery is relatively complicated, and the surgery time is increased.

Disclosure of Invention

The invention aims to provide a vertebral body unfolding and exposing device which can unfold and expose a vertebral body and a soft tissue layer simultaneously.

The technical scheme adopted by the invention for solving the technical problems is as follows: a centrum struts and reveals the device, including strut the regulating lever, left strut unit and right strut unit, the left strut unit includes left regulating arm, left connecting piece and left screw, the right strut unit includes right regulating arm, right connecting piece and right screw; one end of the left adjusting arm is arranged on the spreading adjusting rod, one end of the right adjusting arm is arranged on the spreading adjusting rod, and at least one of the left adjusting arm and the right adjusting arm is arranged on the spreading adjusting rod in a way of being capable of moving and adjusting along the length direction of the spreading adjusting rod through an adjusting mechanism; the left spreading unit further comprises a left spreading plate, and the right spreading unit further comprises a right spreading plate; the left connecting piece is of an L-shaped structure consisting of a first vertical section and a first horizontal section, the upper end of the first vertical section is connected with the left adjusting arm, the lower end of the first vertical section is connected with one end of the first horizontal section, and the other end of the first horizontal section extends towards the right opening unit and is connected with the upper end of the left screw; the right connecting piece is of an L-shaped structure consisting of a second vertical section and a second horizontal section, the upper end of the second vertical section is connected with the right adjusting arm, the lower end of the second vertical section is connected with one end of the second horizontal section, and the other end of the second horizontal section extends towards the left opening unit and is connected with the upper end of the right screw; the left opening plate is connected to the first vertical section, the right opening plate is connected to the second vertical section, and an opening cavity for opening a skin thick tissue layer is formed between the left opening plate and the right opening plate.

Further, the method comprises the following steps: the left opening plate and the right opening plate are arranged in mirror symmetry.

Further, the method comprises the following steps: the left opening plate and the right opening plate are of arc-shaped arch plate structures, and concave sides of the left opening plate and the right opening plate are arranged oppositely.

Further, the method comprises the following steps: a first connecting sleeve is arranged at one end of the first horizontal section, which is connected with the left screw, and the first connecting sleeve is detachably connected with the upper end of the left screw in a sleeved manner; one end of the second horizontal section, which is connected with the right screw, is provided with a second connecting sleeve, and the second connecting sleeve is detachably connected with the upper end of the right screw in a sleeved mode.

Further, the method comprises the following steps: at least one in left side regulating arm and the right regulating arm is realized can installing on strutting the regulation pole along strutting the length direction removal regulation of regulation pole through one of following adjustment mechanism:

firstly, the adjusting mechanism comprises an adjusting sleeve and a first locking screw which are arranged at the end part of a corresponding adjusting arm, wherein an internal thread is arranged in the adjusting sleeve, an external thread is arranged on the distraction adjusting rod, and the adjusting sleeve is in threaded connection and matching with the external thread on the distraction adjusting rod; the first locking screw is arranged on the adjusting sleeve and used for locking the position of the adjusting sleeve on the spreading adjusting rod;

secondly, the adjusting mechanism comprises an adjusting sleeve and an adjusting nut which are arranged at the end part of the corresponding adjusting arm, an external thread which is in threaded connection with the adjusting nut is arranged on the spreading adjusting rod, the adjusting sleeve is sleeved on the spreading adjusting rod in a clearance manner, and two ends of the adjusting sleeve are respectively provided with an adjusting nut which is sleeved on the spreading adjusting rod;

thirdly, the adjusting mechanism comprises a sliding sleeve arranged at the end part of the corresponding adjusting arm, a spreading width adjusting device is arranged on the sliding sleeve, and a rack is arranged on the spreading adjusting rod along the length direction of the spreading adjusting rod; the expanding width adjusting device comprises a transmission mechanism and a stop mechanism, and the transmission mechanism and the stop mechanism are arranged at two ends of the sliding sleeve; the transmission mechanism is a gear in meshing transmission with the rack; a sealing cap is arranged on one axial side of the gear, and a tail cap and a handle for controlling the gear to rotate are sequentially arranged on the other axial side of the gear; the stop mechanism comprises a locking handle hinged on the sliding sleeve, an elastic connecting piece which is convenient for the locking handle to lock the rack is arranged between the sliding sleeve and the locking handle, and the elastic connecting piece is a torsion spring.

Further, the method comprises the following steps: the left adjusting arm and the left connecting piece are of an integrated structure, and the right adjusting arm and the right connecting piece are of an integrated structure.

Further, the method comprises the following steps: the front opening unit comprises a front opening plate, a front connecting piece, a front rotating sleeve and a second locking screw, the front rotating sleeve is connected with one end of the front connecting piece, the front rotating sleeve is at least rotatably and adjustably mounted on an opening adjusting rod between the left opening unit and the right opening unit, the second locking screw is mounted on the front rotating sleeve and used for locking the position of the front rotating sleeve on the opening adjusting rod, and the other end of the front connecting piece is connected with the front opening plate.

Further, the method comprises the following steps: the rear strutting unit is also included, and a sliding sleeve joint section is arranged on one end of the left adjusting arm or the right adjusting arm far away from the strutting adjusting rod in an outward extending way; the back spreading unit comprises a back adjusting arm, a back spreading plate, a back connecting piece, a back rotating sleeve and a third locking screw, one end of the back adjusting arm is installed on the sliding sleeve section in a sliding and sleeved mode only along the length direction of the sliding sleeve section in a sliding and sleeved mode, the back rotating sleeve is connected with one end of the back connecting piece, the back rotating sleeve is installed on the back adjusting arm in a rotating and adjusting mode at least, the third locking screw is installed on the back rotating sleeve to be used for locking the position of the back rotating sleeve on the back adjusting arm, and the other end of the back connecting piece is connected with the back spreading plate.

Further, the method comprises the following steps: a shifting sheet which is used for being inserted into the gap between the adjacent vertebral bodies is arranged in the middle of the lower edge of the front opening plate and/or the rear opening plate and extends downwards.

Further, the method comprises the following steps: the front opening plate and the rear opening plate are of arc-shaped arch plate structures, concave sides of the front opening plate and the rear opening plate are arranged oppositely, and an opening cavity is formed among the left opening plate, the right opening plate, the front opening plate and the rear opening plate.

The invention has the beneficial effects that: according to the invention, by arranging the left distraction unit, the right distraction unit and the adjusting mechanism thereof, the distance between the two left screws and the right screw can be distracted and adjusted in the adjusting process, so that the distance between the two centrums can be distracted and adjusted; meanwhile, the distance between the left opening plate and the right opening plate can be adjusted, and the left opening plate and the right opening plate are specially used for opening soft tissue layers above the vertebral body, so that synchronous opening of the corresponding soft tissue layers is realized; in addition, the connecting piece is arranged to be of an L-shaped structure comprising a section of horizontal section, so that a certain distance is reserved between the soft tissue layer which is propped open by the corresponding left and right propping plates and the corresponding screw, and a corresponding larger propping cavity is formed after the soft tissue layer is propped open, and the propping cavity can effectively expose the position where the left and right screws are installed on the vertebral body and the area within a certain distance range of the periphery of the position, so that an operation space of an operation is formed, the operation is convenient to carry out, and a tissue propping device structure special for propping the soft tissue layer is not required to be additionally arranged. Therefore, the invention can reduce the number of the distractors used in the operation, reduce the shielding influence of the distractor structure on the operation gap space, reduce the operation steps in the operation process and effectively shorten the operation time. In addition, after the corresponding front distraction unit and the rear distraction unit are arranged, the distraction effect on the soft tissue layers at the front side and the rear side can be realized simultaneously, and a distraction cavity with the peripheral soft tissue layers being distracted and limited can be finally formed, so that the distraction effect on the soft tissue layers is further improved, and the operation space of the operation is ensured. In addition, the structure of the corresponding poking sheet is further arranged, so that the poking sheet can extend into the vertebral body gap to achieve certain poking and expanding effects on tissues in the vertebral body gap, and corresponding operation operations in the vertebral body gap are facilitated.

Drawings

FIG. 1 is a schematic view of a distractor of the present invention corresponding to a first configuration;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is a front view of FIG. 1;

FIG. 5 is a schematic view of the adjustment mechanism of FIG. 4 replaced with a second embodiment;

FIG. 6 is a schematic view of a second embodiment of a distractor according to the present invention;

FIG. 7 is an exploded view of FIG. 6;

FIG. 8 is a top view of FIG. 6;

FIG. 9 is a side view of FIG. 6;

labeled as: the device comprises a distraction adjusting rod 1, a left distraction unit 2, a left adjusting arm 21, a left connecting piece 22, a first vertical section 221, a first horizontal section 222, a first connecting sleeve 2221, a left screw 23, a left distraction plate 24, a right distraction unit 3, a right adjusting arm 31, a right connecting piece 32, a second vertical section 321, a second horizontal section 322, a second connecting sleeve 3221, a right screw 33, a right distraction plate 34, a front distraction unit 4, a front distraction plate 41, a front connecting piece 42, a front rotating sleeve 43, a second locking screw 44, a rear distraction unit 5, a rear adjusting arm 51, a rear adjusting sleeve 511, a fourth locking screw 512, a rear distraction plate 52, a rear connecting piece 53, a rear rotating sleeve 54, a third locking screw 55, a distraction cavity 6, an adjusting mechanism 7, an adjusting sleeve 71, a first locking screw 72, an adjusting nut 73, a sliding sleeve section 8, a plectrum 9 and a vertebral body 10.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

It should be noted that, if directional indications are used in the present invention, such as terms of directions and orientations of up, down, left, right, front and back, the terms are used to facilitate description of relative position relationship between members, and an absolute position that is not a position relationship between related members and members is specifically used only to explain the relative position relationship between members and motion conditions under a certain specific posture, and if the specific posture is changed, the directional indication is changed accordingly; in addition, the descriptions of the length, the width, and the like in the present invention are based on the corresponding structures, the dimensional parameters of the components, and the corresponding directions thereof, which are given by those skilled in the art in conjunction with the structures of the drawings and the corresponding description in the present invention.

In addition, the soft tissue layer in the present invention refers to a tissue layer structure formed by soft tissues such as muscle, blood vessel, trachea and skin covering the vertebral body to be operated, and the soft tissue layer needs to be spread and the lower vertebral body part is exposed during the operation, so as to facilitate the operation of the corresponding vertebral body.

Referring to fig. 1 to 4, the distractor of the present invention includes a distraction adjustment rod 1, a left distraction unit 2, and a right distraction unit 3, wherein the left distraction unit 2 includes a left adjustment arm 21, a left connection member 22, and a left screw 23, and the right distraction unit 3 includes a right adjustment arm 31, a right connection member 32, and a right screw 33; one end of the left adjusting arm 21 is arranged on the distraction rod 1, one end of the right adjusting arm 31 is arranged on the distraction rod 1, and at least one of the left adjusting arm 21 and the right adjusting arm 31 is arranged on the distraction rod 1 in a way of moving and adjusting along the length direction of the distraction rod 1 through the adjusting mechanism 7; the left spreading unit 2 further comprises a left spreading plate 24, and the right spreading unit 3 further comprises a right spreading plate 34; the left connecting piece 22 is an L-shaped structure composed of a first vertical section 221 and a first horizontal section 222, the upper end of the first vertical section 221 is connected with the left adjusting arm 21, the lower end of the first vertical section 221 is connected with one end of the first horizontal section 222, and the other end of the first horizontal section 222 extends towards the right opening unit 3 and is connected with the upper end of the left screw 23; the right connecting piece 32 is an L-shaped structure composed of a second vertical section 321 and a second horizontal section 322, the upper end of the second vertical section 321 is connected with the right adjusting arm 31, the lower end of the second vertical section 321 is connected with one end of the second horizontal section 322, and the other end of the second horizontal section 322 extends towards the left distraction unit 2 and is connected with the upper end of the right screw 33; the left spreader plate 24 is connected to the first vertical section 221 and the right spreader plate 34 is connected to the second vertical section 321, forming a spreader cavity 6 between the left spreader plate 24 and the right spreader plate 34.

In the structure, the left screw 23 and the right screw 33 are used for being installed on the corresponding vertebral body 10, then the position of the corresponding left opening unit 2 and the right opening unit 3 is adjusted on the opening adjusting rod 1, so as to adjust the distance between the left opening unit 2 and the right opening unit 3, further realize the adjustment of the distance between the two left screws 23 and the right screw 33, drive the opening action of the two vertebral bodies 10, and lock the two vertebral bodies after adjusting the required opening distance. The specific structure can be shown in figure 4.

More specifically, the left screw 23 and the left connecting member 22 and the right screw 33 and the right connecting member 32 are preferably detachably connected, so that the screws can be easily mounted on the corresponding vertebral bodies 10 in the actual operation process, and then the corresponding distraction unit components are connected with the distraction unit components for distraction. Therefore, in the invention, a first connecting sleeve 2221 is further arranged at one end of the first horizontal section 222, which is connected with the left screw 23, and the first connecting sleeve 2221 is detachably connected with the upper end of the left screw 23 in a sleeved manner; a second connecting sleeve 3221 is arranged at one end of the second horizontal section 322, which is connected with the right screw 33, and the second connecting sleeve 3221 is detachably connected with the upper end of the right screw 33 in a sleeved manner. And moreover, the connection sleeve and the end part of the screw can be further connected in a plugging fit manner in a zero-clearance or interference fit manner, so that the situation that the connection sleeve is easy to fall off after connection is avoided.

In addition, the left distraction plate 24 and the right distraction plate 34 in the invention have the function of distracting soft tissue layers on the corresponding sides above the vertebral body 10, so as to simultaneously distract the corresponding soft tissue layers while distracting the vertebral body 10, thereby avoiding the need of additionally arranging a tissue distracter specially used for distracting the soft tissue layers. Meanwhile, while the left opening plate 24 and the right opening plate 34 are arranged, considering that the opening amount of soft tissue layers is obviously larger than that of vertebral bodies in the operation process, the connecting piece in the invention is further arranged to be in an L-shaped structure, and particularly, reference can be made to the structure shown in the attached drawings; thus, the left opening plate 24 and the right opening plate 34 can be further opened to both sides for a certain distance relative to the left screw 23 and the right screw 33, and a correspondingly larger opening cavity 6 can be formed between the left opening plate 24 and the right opening plate 34, so that the opening distance of the soft tissue layer can be increased, and the operation space requirement of the operation can be met.

In addition, referring to the drawings, it is further preferable in the present invention that the left opening plate 24 and the right opening plate 34 are provided in mirror symmetry; and the opposite face thereof is perpendicular to the opposite spreading direction of the left spreading plate 24 and the right spreading plate 34.

In addition, for the effective distance L between the two left and

right expansion plates

24 and 34 in the expanded expansion cavity 6, when the person skilled in the art uses the corresponding drawings to illustrate, as shown in fig. 4 and 5, the distance L will be approximately equal to the sum of the respective length dimensions of the first horizontal segment 222 and the second horizontal segment 322 plus the sum of the distances between the left and

right screws

23 and 33; the corresponding length dimensions of the first horizontal segment 222 and the second horizontal segment 322 are the same as the length dimension of the distraction rod 1, and also the same as the length dimension of the distraction rod. Of course, for practical surgical requirements, it can combine the requirements of the vertebral body distraction size and the distraction of soft tissue layer to make reasonable setting of the length size of the first horizontal segment 222 and the second horizontal segment 322 and the distance between the left screw 23 and the right screw 33; in the present invention, the corresponding length dimensions of the first horizontal segment 222 and the second horizontal segment 322 should meet the requirements of the actual operation, so as to ensure that the region of the opened cavity 6 formed by opening the skin thick tissue, which corresponds to the exposed vertebral body portion, meets the operation space requirements of the actual operation.

In addition, as described above, the left and

right spreader plates

24, 34 in the present invention are structures for spreading soft tissue layers, and therefore their corresponding thicknesses in the thickness direction of the soft tissue layers should naturally be approximately equal to or even larger than the thickness dimension of the soft tissue layers; in addition, the left and

right spreader plates

24, 34 should have corresponding width dimensions in the thickness direction perpendicular to the skin tissue and in the spreading direction perpendicular to the skin tissue to ensure that soft tissue layers within a certain width range can be spread, and thus ensure that the corresponding width dimensions of the formed spreading cavity 6 meet the requirements of the operation. In addition, the width of the opening plate can be reasonably set according to the operation space requirement of the actual operation.

In addition, the left and

right spreader plates

24, 34 can be theoretically configured as a flat plate structure, such as a rectangular flat plate structure; in the present invention, it is preferable to provide the arch structure in an arc shape, and the concave sides of the left and

right spreader plates

24 and 34 are oppositely provided; as shown in fig. 3, after the soft tissue layer is spread, a window area with a substantially oval cross section is formed, so that the spreading and tearing effect on the soft tissue layer can be properly reduced, and further damage to the soft tissue layer in the spreading process can be reduced. Without loss of generality, in the above-mentioned arc-shaped arch plate structure, the arc direction of the arc-shaped arch plate should be set to be approximately perpendicular to the thickness direction of the skin tissue and perpendicular to the opening direction, i.e. the width direction of the opening plate; and the width dimension of the spreader plate should now in fact be equal to the length dimension of the chord of the arc arch.

In addition, the adjusting mechanism 7 in the invention is used for adjusting the distance between the two left opening units 2 and the right opening unit 3, and theoretically, the adjusting mechanism 7 can be matched with one of the left opening unit 2 and the right opening unit 3 to adjust the distance between the two units; of course, the left and right

opening units

2 and 3 may be provided with corresponding adjusting mechanisms at the same time, so that the distance between the two units can be adjusted more flexibly. In addition, in theory, the adjusting mechanism 7 in the present invention can adopt various adjusting mechanisms known in the prior art to achieve the above-mentioned functional requirement of adjusting the distance between the left distraction unit 2 and the right distraction unit 3; specifically in the present invention, the following three specific configurations of the adjustment mechanism 7 are provided, but not limited to:

in the first structure, referring to fig. 1 to 4, the adjusting mechanism 7 includes an adjusting sleeve 71 and a first locking screw 72 which are arranged at the end of the corresponding adjusting arm, an internal thread is arranged in the adjusting sleeve 71, an external thread is arranged on the distraction rod 1, and the adjusting sleeve 71 is in threaded connection and matching with the external thread on the distraction rod 1; a first locking screw 72 is mounted on the adjustment sleeve 71 for locking the position of the adjustment sleeve 71 on the spreader bar 1. When the structure needs to be adjusted, the corresponding first locking screw 72 is loosened, then the adjusting rod 1 is rotated to be unfolded, so that the corresponding adjusting sleeve 71 and the corresponding unfolding unit can be driven to adjust the position, and the first locking screw 72 is screwed after the adjusting is in place, so that the locking can be realized. In addition, it should be noted that, if in the above-mentioned first structure, when the adjusting mechanisms 7 are provided for both the left-hand opening unit 2 and the right-hand opening unit 3, since the left-hand opening unit 2 and the right-hand opening unit 3 can move to the adjusting positions when the opening adjusting rod 1 is rotated, in order to ensure the adjusting effect, the rotation directions of the external threads corresponding to the left-hand opening unit 2 and the right-hand opening unit 3 are set to be opposite directions, so that the left-hand opening unit 2 and the right-hand opening unit 3 can move in opposite directions or move in opposite directions simultaneously in the adjusting process.

Secondly, referring to fig. 5, the adjusting mechanism 7 includes an adjusting sleeve 71 and an adjusting nut 73 which are arranged at the end of the corresponding adjusting arm, an external thread which is in threaded connection with the adjusting nut 73 is arranged on the spreading adjusting rod 1, the adjusting sleeve 71 is sleeved on the spreading adjusting rod 1 as a gap, and two ends of the adjusting sleeve 71 are respectively provided with one adjusting nut 73 which is sleeved on the spreading adjusting rod 1. When the adjustment is needed, after the corresponding adjusting nut 73 needs to be loosened, the corresponding adjusting sleeve 71 is moved, and then the adjusting nuts 73 on the two sides are screwed to clamp the adjusting sleeve 71 for limiting. In addition, in this structure, the adjustment position can also be moved toward the other end by screwing the corresponding end adjustment nut 73 to push the adjustment sleeve 71.

Thirdly, the structure can be referred to the structure shown in the document 1, and the corresponding structure is directly cited in the invention without improvement; as this structure is known in the art, this patent is incorporated herein in its entirety and for the sake of brevity in detail: the adjusting mechanism 7 comprises a sliding sleeve arranged at the end part of the corresponding adjusting arm, a spreading width adjusting device is arranged on the sliding sleeve, and a rack is arranged on the spreading adjusting rod 1 along the length direction of the spreading adjusting rod; the expanding width adjusting device comprises a transmission mechanism and a stop mechanism, and the transmission mechanism and the stop mechanism are arranged at two ends of the sliding sleeve; the transmission mechanism is a gear in meshing transmission with the rack; a sealing cap is arranged on one axial side of the gear, and a tail cap and a handle for controlling the gear to rotate are sequentially arranged on the other axial side of the gear; the stop mechanism comprises a locking handle hinged on the sliding sleeve, an elastic connecting piece which is convenient for the locking handle to lock the rack is arranged between the sliding sleeve and the locking handle, and the elastic connecting piece is a torsion spring. If the brief description of the present invention is not clear, reference is made directly to the related contents of the expanding width adjusting device portion and the fitting structure thereof with other components in document 1.

In addition, the left and right adjusting

arms

21 and 31 are used for opening the spreader adjustment rod 1 to prevent the spreader adjustment rod 1 from being positioned right above the left and

right spreader units

2 and 3; because the space between the left distraction unit 2 and the right distraction unit 3 is needed by the surgical operation, and the area right above the left distraction unit and the right distraction unit is the area which enters during the surgical operation, if interference exists, the convenience of the surgical operation is seriously influenced. As shown in fig. 1, the respective length directions of the left and

right adjustment arms

21, 31 are substantially perpendicular to the respective length directions of the distraction rod 1, and are also substantially perpendicular to the thickness direction of the soft tissue layer, for the purpose of distracting the distraction rod 1 as described above. More specifically, the left adjusting arm 21 in the present invention may be provided as an integral structure with the left connecting member 22; similarly, the right adjusting arm 31 can also be integrated with the right connecting piece 32; the arrangement does not affect the function requirement of the invention for the expansion of the left expansion unit 2 and the right expansion unit 3.

In addition, the left opening plate 24 may be provided as an integral structure with the first vertical section 221; similarly, the right spreader plate 34 may be configured as an integral structure with the second vertical section 321; such an arrangement does not affect the functional requirements of the present invention for the expansion of the left expansion unit 2 and the right expansion unit 3.

As shown in fig. 6 to 9, the present invention further includes a front spreader unit 4, the front spreader unit 4 includes a front spreader plate 41, a front connector 42, a front rotating sleeve 43, and a second locking screw 44, the front rotating sleeve 43 is connected to one end of the front connector 42, the front rotating sleeve 43 is rotatably mounted on the spreader adjustment lever 1 between the left spreader unit 2 and the right spreader unit 3, the second locking screw 44 is mounted on the front rotating sleeve 43 for locking the position of the front rotating sleeve 43 on the spreader adjustment lever 1, and the other end of the front connector 42 is connected to the front spreader plate 41. The front distraction unit 4 is used for further distracting and limiting one side between the left distraction unit 2 and the right distraction unit 3 after the soft tissue layers are distracted, namely the soft tissue layer at the front side; because the distraction cavity 6 formed after the left distraction unit 2 and the right distraction unit 3 are distracted is approximately a cavity structure with soft tissue layers around, and the left distraction unit 2 and the right distraction unit 3 can only approximately play a good distraction effect on the soft tissue layers on the left and right sides, even if the left distraction unit 2 and the right distraction unit 3 are set to be arc-shaped arch bar structures, the effective distraction limit on the periphery of the distraction cavity 6 is usually difficult to realize. After the front opening unit 4 is arranged, the opening limiting effect on the soft tissue layer at the front side of the opening cavity 6 can be further realized by the front opening plate 41; moreover, the front opening plate 41 can be rotationally adjusted by providing a locking structure of the rotating sleeve 43 and the second locking screw 44, and the opening amount of the soft tissue layer can be adjusted and locked by the rotational adjustment.

In addition, referring to fig. 6 to 9, the present invention further includes a rear spreader unit 5, and a sliding sleeve joint section 8 is provided on the left or right adjusting

arm

21 or 31, extending outward from one end of the spreader adjusting rod 1; the rear spreading unit 5 comprises a rear adjusting arm 51, a rear spreading plate 52, a rear connecting piece 53, a rear rotating sleeve 54 and a third locking screw 55, wherein one end of the rear adjusting arm 51 is mounted on the sliding sleeve section 8 only in a sliding manner along the length direction of the sliding sleeve section 8, the rear rotating sleeve 54 is connected with one end of the rear connecting piece 53, the rear rotating sleeve 54 is mounted on the rear adjusting arm 51 at least in a rotating manner, the third locking screw 55 is mounted on the rear rotating sleeve 54 and used for locking the position of the rear rotating sleeve 54 on the rear adjusting arm 51, and the other end of the rear connecting piece 53 is connected with the rear spreading plate 52. The purpose of the sliding sleeve section 8 is to adjust the distance between the rear spreader unit 5 and the front spreader unit 4 along the corresponding length direction of the right adjusting arm 31. The rear rotating sleeve 54 and the third locking screw 55 are provided to achieve the rotation adjustment of the rear spreader plate 52, similar to the rotation adjustment function of the front spreader plate 41, and can achieve the adjustment and locking of the amount of spreading of the soft tissue layer through the rotation adjustment.

In addition, for the structure and the corresponding size setting of the front opening plate 41 and the rear opening plate 52, the principle is similar to the corresponding parameter setting of the left opening plate 23 and the right opening plate 34, and the corresponding size of the opening cavity 6 to be opened in the actual operation should be reasonably set. In addition, as for the front opening plate 41 and the rear opening plate 52, it is also preferable in the present invention that they are provided in an arch structure having an arc shape, and concave sides of the front opening plate 41 and the rear opening plate 52 are provided oppositely; in this way, the distraction cavity 6 is formed between the left distraction plate 24, the right distraction plate 34, the front distraction plate 41, and the rear distraction plate 52, and the distraction cavity 6 can form a window area having a substantially elliptical or circular cross-section.

Claims

1. A centrum struts and reveals the device, including strut the adjusting lever (1), left strut unit (2) and right strut unit (3), left strut unit (2) including left regulating arm (21), left connecting piece (22) and left screw (23), right strut unit (3) including right regulating arm (31), right connecting piece (32) and right screw (33); one end of a left adjusting arm (21) is arranged on the distraction rod (1), one end of a right adjusting arm (31) is arranged on the distraction rod (1), and at least one of the left adjusting arm (21) and the right adjusting arm (31) is arranged on the distraction rod (1) in a way of moving and adjusting along the length direction of the distraction rod (1) through an adjusting mechanism (7); the method is characterized in that: the left opening unit (2) further comprises a left opening plate (24), and the right opening unit (3) further comprises a right opening plate (34); the left connecting piece (22) is of an L-shaped structure consisting of a first vertical section (221) and a first horizontal section (222), the upper end of the first vertical section (221) is connected with the left adjusting arm (21), the lower end of the first vertical section (221) is connected with one end of the first horizontal section (222), and the other end of the first horizontal section (222) extends towards the right opening unit (3) and is connected with the upper end of the left screw (23); the right connecting piece (32) is of an L-shaped structure consisting of a second vertical section (321) and a second horizontal section (322), the upper end of the second vertical section (321) is connected with the right adjusting arm (31), the lower end of the second vertical section (321) is connected with one end of the second horizontal section (322), and the other end of the second horizontal section (322) extends towards the left opening unit (2) and is connected with the upper end of the right screw (33); the left opening plate (24) is connected to the first vertical section (221), the right opening plate (34) is connected to the second vertical section (321), and an opening cavity (6) is formed between the left opening plate (24) and the right opening plate (34); the rear stretching unit (5) is further included, and a sliding sleeve joint section (8) is arranged on one end, far away from the stretching adjusting rod (1), of the left adjusting arm (21) or the right adjusting arm (31) in an outward extending mode; the rear opening unit (5) comprises a rear adjusting arm (51), a rear opening plate (52), a rear connecting piece (53), a rear rotating sleeve (54) and a third locking screw (55), one end of the rear adjusting arm (51) is mounted on the sliding sleeve section (8) only in a manner of sliding adjustment along the length direction of the sliding sleeve section (8), the rear rotating sleeve (54) is connected with one end of the rear connecting piece (53), the rear rotating sleeve (54) is mounted on the rear adjusting arm (51) at least in a manner of rotating adjustment, the third locking screw (55) is mounted on the rear rotating sleeve (54) and used for locking the position of the rear rotating sleeve (54) on the rear adjusting arm (51), and the other end of the rear connecting piece (53) is connected with the rear opening plate (52); a poking sheet (9) inserted into the gap between the adjacent vertebral bodies (10) is arranged at the middle part of the lower edge of the front opening plate (41) and/or the rear opening plate (52) and extends downwards.

2. A vertebral body distraction device according to claim 1, wherein: the left opening plate (24) and the right opening plate (34) are arranged in mirror symmetry.

3. A vertebral body distraction device according to claim 2, wherein: the left opening plate (24) and the right opening plate (34) are of arc-shaped arch plate structures, and the concave sides of the left opening plate (24) and the right opening plate (34) are oppositely arranged.

4. A vertebral body distraction device according to claim 1, wherein: a first connecting sleeve (2221) is arranged at one end of the first horizontal section (222) connected with the left screw (23), and the first connecting sleeve (2221) is in detachable sleeved connection with the upper end of the left screw (23); a second connecting sleeve (3221) is arranged at one end, connected with the right screw (33), of the second horizontal section (322), and the second connecting sleeve (3221) is detachably connected with the upper end of the right screw (33) in a sleeved mode.

5. A vertebral body distraction device according to claim 1, wherein: at least one of the left adjusting arm (21) and the right adjusting arm (31) is arranged on the distraction rod (1) in a way of moving and adjusting along the length direction of the distraction rod (1) through one of the following adjusting mechanisms (7):

firstly, the adjusting mechanism (7) comprises an adjusting sleeve (71) and a first locking screw (72) which are arranged at the end part of the corresponding adjusting arm, an internal thread is arranged in the adjusting sleeve (71), an external thread is arranged on the distraction rod (1), and the adjusting sleeve (71) is in threaded connection and matching with the external thread on the distraction rod (1); a first locking screw (72) is mounted on the adjusting sleeve (71) for locking the position of the adjusting sleeve (71) on the spreader adjustment lever (1);

secondly, the adjusting mechanism (7) comprises an adjusting sleeve (71) and an adjusting nut (73) which are arranged at the end part of the corresponding adjusting arm, an external thread which is in threaded connection with the adjusting nut (73) is arranged on the spreading adjusting rod (1), the adjusting sleeve (71) is sleeved on the spreading adjusting rod (1) in a clearance manner, and two ends of the adjusting sleeve (71) are respectively provided with one adjusting nut (73) which is sleeved on the spreading adjusting rod (1);

thirdly, the adjusting mechanism (7) comprises a sliding sleeve arranged at the end part of the corresponding adjusting arm, a spreading width adjusting device is arranged on the sliding sleeve, and a rack is arranged on the spreading adjusting rod (1) along the length direction of the spreading adjusting rod; the expanding width adjusting device comprises a transmission mechanism and a stop mechanism, and the transmission mechanism and the stop mechanism are arranged at two ends of the sliding sleeve; the transmission mechanism is a gear in meshing transmission with the rack; a sealing cap is arranged on one axial side of the gear, and a tail cap and a handle for controlling the gear to rotate are sequentially arranged on the other axial side of the gear; the stop mechanism comprises a locking handle hinged on the sliding sleeve, an elastic connecting piece which is convenient for the locking handle to lock the rack is arranged between the sliding sleeve and the locking handle, and the elastic connecting piece is a torsion spring.

6. A vertebral body distraction device according to claim 1, wherein: the left adjusting arm (21) and the left connecting piece (22) are of an integral structure, and the right adjusting arm (31) and the right connecting piece (32) are of an integral structure.

7. A vertebral body distraction device according to any of claims 1 to 6, wherein: the front opening unit (4) comprises a front opening plate (41), a front connecting piece (42), a front rotating sleeve (43) and a second locking screw (44), the front rotating sleeve (43) is connected with one end of the front connecting piece (42), the front rotating sleeve (43) is at least rotatably and adjustably mounted on an opening adjusting rod (1) between the left opening unit (2) and the right opening unit (3), the second locking screw (44) is mounted on the front rotating sleeve (43) and used for locking the position of the front rotating sleeve (43) on the opening adjusting rod (1), and the other end of the front connecting piece (42) is connected with the front opening plate (41).

8. A vertebral body distraction device according to claim 7, wherein: preceding spreader plate (41) and back spreader plate (52) are curved arch bar structure to the concave side of preceding spreader plate (41) and back spreader plate (52) sets up relatively, forms between left spreader plate (24), right spreader plate (34), preceding spreader plate (41) and back spreader plate (52) and struts cavity (6).