CN213129835U

CN213129835U - Stable intramedullary nail

Info

Publication number: CN213129835U
Application number: CN202021373269.1U
Authority: CN
Inventors: 徐炜; 王艺鹏
Original assignee: Changzhou Jianli Bangde Medical Devices Co Ltd
Current assignee: Changzhou Jianli Bangde Medical Devices Co Ltd
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2021-05-07
Anticipated expiration: 2030-07-13

Abstract

The utility model relates to the technical field of medical equipment, in particular to a stable intramedullary nail, which comprises a nail body, a screw rod, an upper slide block, a lower slide block, an upper clamping claw, a lower clamping claw and a guide post, wherein the nail body is provided with a cavity along the axial direction of the nail body, the screw rod is rotationally arranged on the nail body, the screw rod is positioned in the cavity, the central axis of the screw rod and the central axis of the nail body are arranged in parallel, two ends of the screw rod are provided with two threads with opposite rotating directions, the upper slide block is in threaded connection with one end of the screw rod, the lower slide block is in threaded connection with the other end of the screw rod, and two ends of the nail body are respectively provided with through holes corresponding to the upper slide block and the lower slide block, the intramedullary nail can be fixed or loosened, and the operation is simple and convenient.

Description

Stable intramedullary nail

Technical Field

The utility model belongs to the technical field of medical instrument equipment technique and specifically relates to a firm type intramedullary nail is related to.

Background

Currently, the operation treatment of long-tube bone backbone fracture usually adopts fixation operations such as intramedullary pin, steel plate, external fixation frame, etc., in the intramedullary nail fixation operation, the general intramedullary pin is provided with locking nail through holes with radial near and far ends, when in use, the intramedullary pin is placed into the medullary cavity, then corresponding through holes are punched at the positions of the locking nail through holes of the healthy long-tube cortical bone corresponding to the intramedullary pin, so that the locking nail can pass through the long-tube cortical bone and the near and far end locking holes of the intramedullary pin, thereby achieving the locking effect. When the intramedullary pin is used, the locking nails at the two ends of the near end and the far end are required to be connected and fixed, the intramedullary pin is placed into the medullary cavity and then drilled during installation, and the position of the locking nail through hole of the intramedullary pin cannot be well found at the near end and the far end of the cortex of the long tubular bone, so that the locking nail cannot penetrate through the cortex of the long tubular bone and the locking hole, and meanwhile, the hole is drilled at the cortex of the healthy long tubular bone, and new trauma and pain are brought to a patient; in addition, because the positions between the locking nail through holes are determined, and the locking nail through holes are arranged in the radial direction, in the locking nail mounting process, axial relative extrusion force cannot be generated, the purpose of tight joint of two ends of a fracture part is difficult to achieve, after the locking nail penetrates through the locking nail through holes to achieve locking of the intramedullary nail, healing of the fracture end is delayed or not healed due to non-tight combination of the two ends of the fracture part, and in severe cases, one end of the locking nail needs to be taken out to achieve the purpose of fracture healing after operation.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: in order to solve the problem that the locking nails at the proximal end and the distal end are required to be connected and fixed by using the intramedullary nail, a stable intramedullary nail is provided.

The utility model provides a technical scheme that its technical problem adopted is: a stable intramedullary nail comprises a nail body, a screw rod, an upper slide block, a lower slide block, an upper clamping jaw, a lower clamping jaw and a guide post, wherein a cavity body is arranged on the nail body along the axial direction of the nail body, the screw rod is rotationally arranged on the nail body, the screw rod is positioned in the cavity body, the central axis of the screw rod and the central axis of the nail body are arranged in parallel, two threads with opposite rotating directions are arranged at the two ends of the screw rod, the upper slide block is in threaded connection with one end of the screw rod, the lower slide block is in threaded connection with the other end of the screw rod, through holes corresponding to the upper slide block and the lower slide block are respectively arranged at the two ends of the nail body, the upper clamping jaw and the lower clamping jaw are rotationally arranged in the through holes, the upper clamping jaw corresponds to the upper slide block, one end of the upper clamping jaw is positioned outside the, the lower clamping jaw corresponds to the lower sliding block, one end of the lower clamping jaw is positioned outside the nail body, the other end of the lower clamping jaw is positioned in the cavity, the upper clamping jaw and the lower clamping jaw are arranged in a relatively inclined mode, one ends of the upper sliding block and the lower sliding block are provided with conical surfaces, the conical surface of the upper sliding block and the conical surface of the lower sliding block are arranged relatively, a first spring is arranged between one end, away from the upper sliding block, of the upper clamping jaw and the through hole, one end, away from the first spring, of the upper clamping jaw and the conical surface of the upper sliding block are in contact, the rotation center point of the upper clamping jaw is positioned between the first spring and the upper sliding block, a second spring is arranged between one end, away from the second spring, of the lower clamping jaw and the conical surface of the lower sliding block, and the rotation center point of the upper clamping jaw is positioned between the second spring and the lower, the slider up with the one end of slider down all have with cavity body assorted base, the base slides and sets up in the cavity, the base is located the main aspects of the conical surface, the guide post sets up in the cavity, the guide post with the mutual parallel arrangement of screw rod, the slider up reaches all seted up on the base on the slider down with guide post assorted spout, the spout slides and sets up on the guide post. Make the slider-up and lower slider be close to relatively or keep away from through rotating the screw rod, the jack catch is opened or is contract simultaneously with lower jack catch in the control for the intramedullary nail is fixed or is loosened, and easy operation is convenient, and the guide post plays spacing guide effect to slider-up and lower slider, prevents to take place to follow the phenomenon of changeing between slider-up and lower slider and the screw rod.

In order to reduce the friction between the upper jaw and the upper sliding block and the friction between the lower jaw and the lower sliding block, further, one end of the upper jaw close to the upper sliding block is rotatably provided with a first idler wheel, the first idler wheel is in contact with the conical surface of the upper sliding block, one end of the lower jaw close to the lower sliding block is rotatably provided with a second idler wheel, and the second idler wheel is in contact with the conical surface of the lower sliding block. Through setting up first gyro wheel on last jack catch for the face friction between last jack catch and the last slider changes into the rolling friction of first gyro wheel and last slider, and sets up the second gyro wheel on the jack catch down, makes the face friction between lower jack catch and the lower slider, changes into the rolling friction of second gyro wheel and lower slider, greatly reduced last jack catch and last slider, and the friction between lower jack catch and the lower slider, improved the life of last jack catch and lower jack catch.

The utility model has the advantages that: the utility model discloses when firm type intramedullary nail is using, make top shoe and lower slider relative displacement through the control screw, thereby control top jaw and lower jack catch open simultaneously or close, make the intramedullary nail fixed or loosen, its easy operation is convenient, avoided using this kind of intramedullary needle, need nearly, the lock pin at distal end both ends is connected fixedly, during the installation with intramedullary needle put into the pulp cavity back drilling, can't be fine near the long tubular bone cortex, the distal end looks for the position that corresponds intramedullary needle lock pin through-hole, can cause the lock pin to be difficult to pass cortical long tube and lockhole like this, bore in healthy long tubular bone cortex simultaneously, also brought new wound and painful for patient; in addition, because the positions between the locking nail through holes are determined, and the locking nail through holes are arranged in the radial direction, in the locking nail mounting process, axial relative extrusion force cannot be generated, the purpose of tight joint of two ends of a fracture part is difficult to achieve, after the locking nail penetrates through the locking nail through holes to achieve locking of the intramedullary nail, healing of the fracture end is delayed or not healed due to non-tight combination of the two ends of the fracture part, and in severe cases, one end of the locking nail needs to be taken out to achieve the purpose of fracture healing after operation.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a front view of the stabilized intramedullary nail of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is an enlarged view of a portion B of FIG. 1;

FIG. 4 is a front view of the stabilized intramedullary nail of the present invention after adjustment;

fig. 5 is a schematic three-dimensional structure diagram of the upper slide block in the stable intramedullary nail of the present invention.

In the figure: 1. the nail body, 101, the cavity body, 102, the through-hole, 2, the screw rod, 3, the top shoe, 4, the bottom shoe, 5, go up the jack catch, 6, lower jack catch, 7, the guide post, 8, the conical surface, 9, the base, 10, first spring, 11, second spring, 12, spout, 13, first gyro wheel, 14, the second gyro wheel.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.

Examples

As shown in fig. 1-5, a stable intramedullary nail comprises a nail body 1, a screw rod 2, an upper slide block 3, a lower slide block 4, an upper jaw 5, a lower jaw 6 and a guide post 7, wherein the nail body 1 is provided with a cavity 101 along the axial direction thereof, the screw rod 2 is rotatably arranged on the nail body 1, the screw rod 2 is positioned in the cavity 101, the central axis of the screw rod 2 and the central axis of the nail body 1 are arranged in parallel, two ends of the screw rod 2 are provided with two threads with opposite rotation directions, the upper slide block 3 is in threaded connection with one end of the screw rod 2, the lower slide block 4 is in threaded connection with the other end of the screw rod 2, two ends of the nail body 1 are respectively provided with a through hole 102 corresponding to the upper slide block 3 and the lower slide block 4, the upper jaw 5 and the lower jaw 6 are both rotatably arranged in the through hole 102, the upper jaw 5 corresponds to the upper slide block 3, one end of the upper jaw 5 is located outside the nail body 1, the other end of the upper jaw 5 is located inside the cavity body 101, the lower jaw 6 corresponds to the lower sliding block 4, one end of the lower jaw 6 is located outside the nail body 1, the other end of the lower jaw 6 is located inside the cavity body 101, the upper jaw 5 and the lower jaw 6 are arranged in a relatively inclined mode, one ends of the upper sliding block 3 and the lower sliding block 4 are respectively provided with a conical surface 8, the conical surface 8 of the upper sliding block 3 and the conical surface 8 of the lower sliding block 4 are arranged in a relatively inclined mode, a first spring 10 is arranged between one end, far away from the upper sliding block 3, of the upper jaw 5 and the through hole 102, one end, far away from the first spring 10, of the upper jaw 5 is in contact with the conical surface 8 of the upper sliding block 3, the rotation central point of the upper jaw 5 is located between the first spring 10 and the upper sliding block 3, a second spring 11 is arranged between one end, far away from the, lower jack catch 6 is kept away from the one end of second spring 11 with the conical surface 8 contact of lower slider 4, the rotation central point of lower upper jack catch 5 is located between second spring 11 and the lower slider 4, upper slider 3 with the one end of lower slider 4 all have with cavity body 101 assorted base 9, base 9 slides and sets up in the cavity body 101, base 9 is located the main aspects of conical surface 8, guide post 7 sets up in the cavity body 101, guide post 7 with screw rod 2 parallel arrangement each other, upper slider 3 reaches all seted up on the base 9 on lower slider 4 with guide post 7 assorted spout 12, spout 12 slides and sets up on the guide post 7.

One end of the upper clamping jaw 5, which is close to the upper sliding block 3, is rotatably provided with a first roller 13, the first roller 13 is in contact with the conical surface 8 of the upper sliding block 3, one end of the lower clamping jaw 6, which is close to the lower sliding block 4, is rotatably provided with a second roller 14, and the second roller 14 is in contact with the conical surface 8 of the lower sliding block 4.

When the stable intramedullary nail is used, the specific operation steps are as follows: when the intramedullary nail is placed in a bone and needs to be fixed, the screw rod 2 is rotated, the screw rod 2 drives the upper sliding block 3 and the lower sliding block 4 to be relatively close to each other, so that the first roller 13 on the upper clamping jaw 5 rolls on the conical surface 8 of the upper sliding block 3, meanwhile, the sliding groove 12 on the base 9 of the upper sliding block 3 slides on the guide post 7, the upper clamping jaw 5 rotates in the through hole 102 under the action of the first spring 10 and gradually opens, the second roller 14 on the lower clamping jaw 6 rolls on the conical surface 8 of the lower sliding block 4, meanwhile, the sliding groove 12 on the base 9 of the lower sliding block 4 slides on the guide post 7, and the lower clamping jaw 6 rotates in the through hole 102 under the action of the second spring 11 and gradually opens until the bone is fixed by the upper clamping jaw 5 and the lower clamping jaw 6; when the intramedullary nail needs to be disassembled, the screw rod 2 is rotated, the screw rod 2 drives the upper sliding block 3 and the lower sliding block 4 to be relatively far away, so that a first roller 13 on the upper jaw 5 rolls on the conical surface 8, meanwhile, a sliding groove 12 on an upper base 9 of the upper sliding block 3 slides on the guide post 7, the upper jaw 5 rotates in the through hole 102 under the action of a first spring 10 and gradually contracts, a second roller 14 on the lower jaw 6 rolls on the conical surface 8, meanwhile, a sliding groove 12 on an upper base 9 of the lower sliding block 4 slides on the guide post 7, and the lower jaw 6 rotates in the through hole 102 under the action of a second spring 11 and gradually contracts, so that the intramedullary nail is loosened and the intramedullary nail is extracted; guide post 7 plays spacing and the effect of direction to last slider 3 and lower slider 4, prevent that slider 3 and lower slider 4 from following the commentaries on classics along with screw rod 2 together, because conical surface 8 on slider 3 and the conical surface 8 on the lower slider 4 set up relatively, it has a plurality ofly to go up jack catch 5 and jack catch 6 along rounding evenly distributed, it inclines relatively and rotates the setting on nail body 1 with jack catch 6 down to go up jack catch 5 simultaneously, make the orientation of opening between jack catch 5 and the lower jack catch 6 set up relatively, guarantee skeleton relative displacement, patient's skeleton fixation stable and reliable has been guaranteed.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A firm type intramedullary nail which is characterized in that: comprises a nail body (1), a screw rod (2), an upper sliding block (3), a lower sliding block (4), an upper clamping jaw (5), a lower clamping jaw (6) and a guide post (7), wherein a cavity body (101) is arranged in the nail body (1) along the axial direction of the nail body (1), the screw rod (2) is rotatably arranged on the nail body (1), the screw rod (2) is positioned in the cavity body (101), the central axis of the screw rod (2) is parallel to the central axis of the nail body (1), two threads with opposite rotating directions are arranged at two ends of the screw rod (2), the upper sliding block (3) is in threaded connection with one end of the screw rod (2), the lower sliding block (4) is in threaded connection with the other end of the screw rod (2), through holes (102) corresponding to the upper sliding block (3) and the lower sliding block (4) are respectively arranged at two ends of the nail body (1), the upper clamping jaw (5) and the lower clamping jaw (6) are rotatably arranged in the through holes (102), go up jack catch (5) with it is corresponding to go up slider (3), the one end of going up jack catch (5) is located outside nail body (1), the other end of going up jack catch (5) is located in the cavity body (101), lower jack catch (6) with lower slider (4) are corresponding, the one end of jack catch (6) is located outside nail body (1) down, the other end of jack catch (6) is located down in the cavity body (101), show go up jack catch (5) with jack catch (6) relative slope sets up down, go up slider (3) with the one end of slider (4) all has conical surface (8) down, go up the conical surface (8) of slider (3) with the conical surface (8) of slider (4) set up relatively down, go up jack catch (5) keep away from the one end of slider (3) and be equipped with first spring (10) between through-hole (102), go up jack catch (5) keep away from the one end of first spring (10) with the awl of last slider (3), the one end of last jack catch (5) with the one end of last slider (10 Face (8) contact, the rotation central point of going up jack catch (5) is located between first spring (10) and upper slide (3), lower jack catch (6) keep away from the one end of lower slider (4) and be equipped with second spring (11) between through-hole (102), jack catch (6) are kept away from down the one end of second spring (11) with conical surface (8) contact of slider (4) down, the rotation central point of going up jack catch (5) is located between second spring (11) and lower slider (4), upper slide (3) with the one end of slider (4) down all have with cavity body (101) assorted base (9), base (9) slide and set up in cavity body (101), base (9) are located the main aspects of conical surface (8), guide post (7) set up in cavity body (101), guide post (7) with screw rod (2) parallel arrangement each other, top shoe (3) reach all offer on base (9) on lower slider (4) with guide post (7) assorted spout (12), spout (12) slide setting is in on guide post (7).

2. A stabilized intramedullary nail according to claim 1, wherein: one end, close to the upper sliding block (3), of the upper clamping jaw (5) is rotatably provided with a first roller (13), the first roller (13) is in contact with a conical surface (8) of the upper sliding block (3), one end, close to the lower sliding block (4), of the lower clamping jaw (6) is rotatably provided with a second roller (14), and the second roller (14) is in contact with the conical surface (8) of the lower sliding block (4).