Screw implantation depth measuring deviceTechnical Field
The invention relates to the technical field of medical instruments, in particular to a screw insertion depth measuring device.
Background
In spinal surgery, the depth of implantation of the screws is critical to the success of the surgery. The screw needs to be accurately implanted into the vertebral body to ensure stability and avoid injury, and during surgery, the physician typically uses a k-wire for initial positioning and to measure the desired depth of implantation of the screw. However, in actual operation, it is difficult for a doctor to accurately judge the depth to which the screw has been screwed, and too deep a screw may cause penetration of the vertebral body, damage of the spinal cord or nerve root, cause serious nerve damage, too shallow a screw may cause unstable fixation, affect the stability after operation, and increase the risk of re-operation.
Currently, intraoperative fluoroscopy techniques (such as X-ray fluoroscopy) are used to examine the implantation depth of the screw, however, this method may increase the operation time and radiation exposure, and has a limitation in real-time and accuracy, in order to observe the implantation depth of the screw in time and ensure the accuracy and reliability of the read values, we provide a screw implantation depth measuring device to meet the demands.
Disclosure of Invention
The invention aims to solve the technical problem of providing a screw insertion depth measuring device so as to solve the limitations of real-time and accuracy of the existing screw depth detection during implantation.
In order to solve the technical problems, the invention provides the following technical scheme:
The screw insertion depth measuring device comprises a rod body and a rotating handle arranged at the top of the rod body, wherein a detecting part is arranged in the middle of the rod body and used for displaying the insertion depth of a screw in real time according to the rotation number of the rod body, a feedback part is arranged on the detecting part and used for providing continuously enhanced pressure feedback at the latter half section of screw insertion, a first external thread is arranged in the middle of the rod body, and a bearing is fixedly sleeved on the rod body and is positioned at one end of the first external thread far away from the rotating handle.
Optionally, the detection part comprises a detection sleeve sleeved on the rod body through a first external thread, a first threaded hole penetrating through the detection sleeve is formed in the detection sleeve, the first threaded hole is matched with the first external thread, the detection part further comprises a holding sleeve sleeved outside the rod body through bearing rotation, a first limit rib axially arranged along the rod body is arranged on the inner wall of the holding sleeve, the detection sleeve is sleeved in the first limit rib, a first limit groove matched with the first limit rib is formed in the detection sleeve, a plurality of first scales axially arranged along the rod body are formed in the detection sleeve, a window corresponding to the first scale position is formed in the holding sleeve, and a limit part used for limiting the simultaneous movement of the detection sleeve and the first external thread is arranged on the holding sleeve.
Optionally, the feedback part is including seting up the second screw hole at the window inner wall, the second screw hole is located the top of first spacing muscle and is equipped with the clearance between with first spacing muscle, it is equipped with the top cap to grip telescopic top cover, the top inner wall of top cap is provided with the cylinder that deeply grips in the sleeve, the second external screw thread with second screw hole looks adaptation has been seted up outward to the cylinder, first elastic component is installed to the bottom of second external screw thread, the one end orientation detection sleeve of second external screw thread is kept away from to first elastic component, be provided with a plurality of second scales of arranging along body of rod axial on the sleeve of gripping, the top cap atress rotates the back and along the axial translation of gripping the sleeve, the second scale is used for detecting the position of translation back top cap bottom.
The clamping device comprises a holding sleeve, a clamping part, a clamping groove, a pressing plate, a bending part, a second limiting rib and a second limiting rib, wherein the holding sleeve is provided with a through groove penetrating the holding sleeve, a plurality of second limiting grooves are uniformly formed in the outer side of the top cover along a peripheral ring, clamping grooves are formed in the outer side of the detecting sleeve and are flush with zero graduation of a first graduation, the clamping part is further provided with a clamping ring which is in sliding connection with the through groove, one side of the clamping ring, which is located outside the detecting sleeve, is provided with a pressing plate, a gap is formed between the pressing plate and the detecting sleeve, the bottom of the pressing plate is provided with a bending part which bends towards the detecting sleeve, the top of the pressing plate is provided with an extending part which extends along the axial direction of a rod body, one side of the extending part, which is close to the detecting sleeve, is provided with a second limiting rib which is matched with any second limiting groove, when one end of the bending part, which is far away from the pressing plate, is in abutting against the detecting sleeve, the clamping groove is clamped with the clamping groove, and is located at the zero graduation position on the first graduation, and the clamping ring is stressed to generate elastic deformation when the clamping ring is separated from the clamping groove.
Optionally, a wing-shaped plate is arranged at the top of the extension part, the wing-shaped plate is arc-shaped, and the inner diameter of the wing-shaped plate is identical to the outer diameter of the top cover.
Optionally, a first through hole coaxial with the rod body is formed in the middle of the cylinder, and the inner diameter of the first through hole is larger than the outer diameter of the rod body.
Optionally, a guiding opening is formed in the bottom of the first limiting groove.
Optionally, the first elastic element is a conical spring and is sleeved outside the rod body.
Optionally, the bottom of cylinder has seted up first back-off groove, the second back-off groove has all been seted up to detection sleeve's top and bottom, after detection sleeve and cylinder conflict, the cavity height that forms between first back-off groove and the second back-off groove and the diameter looks adaptation of first elastic component.
Optionally, the second elastic component is installed to detection sleeve's bottom, the second elastic component is conical spring and cover and establishes outside the body of rod, the one end that the detection sleeve was kept away from to the second elastic component is contradicted with the bearing.
Optionally, the pressing plate is disposed on one side of the window and does not overlap the window.
Compared with the prior art, the invention has at least the following beneficial effects:
In the scheme, through setting up detection part for screw in degree of depth can be quick accurate through the scale readout, thereby avoid the screw to screw in the condition of too dark or shallow excessively, reduced the damage of operation to the patient, when reverse rotation revolves the handle, the axial of the body of rod is followed to the detection sleeve and is kept away from the one end motion of revolving the handle, has ensured the accuracy and the reliability of the numerical value that the first scale of passing through when revolving the handle and reading out of window.
Through setting up feedback part, before the screw of screw in affected part will reach the preset position, first elastic component is contradicted with detecting the sleeve, increase detecting telescopic motion resistance through the elasticity of first elastic component self, and then pass through detecting the sleeve with this power transmission to on the revolve the handle, thereby realize feedback function, the benefit of setting up like this is, after first elastic component is contradicted with detecting the sleeve, operating personnel perception resistance, can slow down and revolve the screwing speed, and observe whether the first scale of window position department reaches the preset value, improve the security of operation through real-time feedback and detection.
Drawings
FIG. 1 is a schematic perspective view of a screw insertion depth measuring device;
FIG. 2 is a cross-sectional view of a screw insertion depth measurement device;
FIG. 3 is a schematic perspective view of a grip sleeve;
FIG. 4 is a cross-sectional view of the grip sleeve;
FIG. 5 is a schematic view of an assembled perspective structure of the detection sleeve, the top cover and the rod body;
FIG. 6 is a schematic perspective view of a detection sleeve;
FIG. 7 is a schematic view of a three-dimensional structure of the assembled detection sleeve and the limiting component;
FIG. 8 is a schematic perspective view of a limiting component;
Fig. 9 is a schematic perspective view of the top cover.
Reference numerals
1. The device comprises a rod body, 2, a rotary handle, 3, a detection part, 4, a feedback part, 5, a first external thread, 6, a detection sleeve, 7, a first threaded hole, 8, a bearing, 9, a holding sleeve, 10, a first limit rib, 11, a first limit groove, 12, a first scale, 13, a window, 14, a second threaded hole, 15, a top cover, 16, a cylinder, 17, a second external thread, 18, a second scale, 19, a first elastic piece, 20, a clamping groove, 21, a clamping ring, 22, a pressing plate, 23, a buckling part, 24, a first through hole, 25, a first relief groove, 26, a second relief groove, 27, a second limit groove, 28, an extension part, 29, a second limit rib, 30, a wing plate, 31, a second elastic piece, 32, a limit part, 33 and a through groove.
While particular structures and devices are shown in the drawings to enable a clear implementation of embodiments of the invention, this is for illustrative purposes only and is not intended to limit the invention to the particular structures, devices and environments, which may be modified or adapted by those of ordinary skill in the art, as desired, and which remain within the scope of the appended claims.
Detailed Description
The following describes in detail a screw insertion depth measuring device according to the present invention with reference to the drawings and the embodiments. While the invention has been described herein in detail in order to make the embodiments more detailed, the following embodiments are preferred and can be embodied in other forms as well known to those skilled in the art, and the accompanying drawings are only for the purpose of describing the embodiments more specifically and are not intended to limit the invention to the specific forms disclosed herein.
As shown in fig. 1 to 9, the embodiment of the invention provides a screw insertion depth measuring device, which comprises a rod body 1 and a knob 2 arranged at the top of the rod body 1, wherein one end of the rod body 1, which is far away from the knob 2, is generally provided with a screw screwing mechanism which is matched with screws of different types and is used for screwing the screws of different types in cooperation with the rotation of the rod body 1, the middle part of the rod body 1 is provided with a detection part 3, the detection part 3 is used for displaying the implantation depth of the screws in real time according to the rotation number of the rod body 1, the middle part of the rod body 1 is provided with a first external thread 5, a bearing 8 is fixedly sleeved on the rod body 1, and the bearing 8 is positioned at one end of the first external thread 5, which is far away from the knob 2.
The detection part 3 comprises a detection sleeve 6 which is sleeved on the rod body 1 through first external threads 5, a first threaded hole 7 which penetrates through the detection sleeve 6 is formed in the detection sleeve 6, the first threaded hole 7 is matched with the first external threads 5, the detection part 3 further comprises a holding sleeve 9 which is sleeved outside the rod body 1 through rotation of a bearing 8, a first limit rib 10 which is axially arranged along the rod body 1 is arranged on the inner wall of the holding sleeve 9, the detection sleeve 6 is sleeved in the first limit rib 10, a first limit groove 11 which is matched with the first limit rib 10 is formed in the detection sleeve 6, a plurality of first scales 12 which are axially arranged along the rod body 1 are formed in the detection sleeve 6, and a window 13 which corresponds to the first scales 12 is formed in the holding sleeve 9.
When the screw is required to be implanted into a patient, the operator holds the holding sleeve 9 by one hand and screws the screwing handle 2 by the other hand, the screwing handle 2 drives the screw screwing unit to rotate through the rod body 1 and screws the screw into the affected part, in the process, the detection sleeve 6 moves to one side close to the screwing handle 2 along the axial direction of the rod body 1 under the action of the first external thread 5 and the first threaded hole 7 through the limitation of the first limiting groove 11 and the first limiting rib 10, so that the position of the first scale 12 relative to the window 13 is changed, and the setting enables the screw screwing depth to be read out through the scale rapidly and accurately, and the damage of the operation to the patient is reduced.
When the knob 2 is reversely rotated, the detection sleeve 6 moves along the axial direction of the rod body 1 towards the end far away from the knob 2, so that the accuracy and reliability of the numerical value read out through the first scale 12 and the window 13 when the knob 2 is reversely rotated are ensured.
It should be noted that, the knob 2 needs to be turned before operation, and the zero scale of the first scale 12 of the detection sleeve 6 is correspondingly displayed at the position of the window 13, so that the detection reading is simply and directly read, and the difficulty of the reading is reduced.
As shown in figures 1 to 8, the detecting component 3 is provided with a feedback component 4, the feedback component 4 is used for providing continuously enhanced pressure feedback at the latter half section of screw implantation, the feedback component 4 comprises a second threaded hole 14 formed in the inner wall of the window 13, the second threaded hole 14 is positioned above the first limiting rib 10 and is provided with a gap with the first limiting rib 10, the top of the window 13 is sleeved with a top cover 15, the inner wall of the top cover 15 is provided with a cylinder 16 protruding into the holding sleeve 9, the cylinder 16 is externally provided with a second external thread 17 matched with the second threaded hole 14, the bottom of the second external thread 17 is provided with a first elastic piece 19, one end of the first elastic piece 19, which is far away from the second external thread 17, faces the detecting sleeve 6, the holding sleeve 9 is provided with a plurality of second scales 18 which are axially distributed along the rod body 1, the top cover 15 axially translates along the holding sleeve 9 after being forced to rotate, and the second scales 18 are used for detecting the position of the bottom of the top cover 15 after translation.
Before the screw of screw in affected part will reach the preset position, first elastic component 19 contradicts with detecting sleeve 6, increase detecting sleeve 6's motion resistance through the elasticity of first elastic component 19 self, and then transmit this power to on the knob 2 through detecting sleeve 6 to realize the feedback function, the benefit of setting like this is, after first elastic component 19 contradicts with detecting sleeve 6, operating personnel perception resistance, can slow down the screwing speed, and observe whether first scale 12 of window 13 position department reaches the preset value, improve the security of operation through real-time feedback and detection.
As shown in fig. 2, fig. 3, and fig. 6 to fig. 9, a limiting component 32 for limiting the simultaneous movement of the detection sleeve 6 and the first external thread 5 is mounted on the holding sleeve 9, a through groove 33 penetrating through the holding sleeve 9 is formed in the holding sleeve 9, a plurality of second limiting grooves 27 are uniformly formed in the outer side of the top cover 15 along the circumference, a clamping groove 20 is formed in the outer side of the detection sleeve 6, the clamping groove 20 is flush with the zero scale of the first scale 12, the limiting component 32 further comprises a clamping ring 21 slidably connected with the through groove 33, a pressing plate 22 is arranged on one side of the clamping ring 21, which is located outside the detection sleeve 6, a gap is formed between the pressing plate 22 and the detection sleeve 6, a buckling part 23 bending towards the detection sleeve 6 is arranged at the bottom of the pressing plate 22, an extending part 28 extending along the axial direction of the rod body 1 is formed in the top of the pressing plate 22, a second limiting rib 29 matched with any second limiting groove 27 is formed in one side of the extending part 28, when one end of the buckling part 23, which is far away from the pressing plate 22, is in contact with the detection sleeve 6, the clamping groove 20, the clamping ring 21 is clamped with the clamping groove 20, and the clamping groove 21 is located at the position of the first scale 12, the buckling part 21 is located at the position of the first scale 21, and the buckling part is separated from the first limiting rib 20, and the buckling part is deformed elastically when the buckling part is located at the buckling part 21 and the buckling part is located at the second position, and the second limiting groove 21 is located at the position, and is separated from the position from the first position.
Before the screw is implanted, if the screw screwing-in depth is required to be adjusted, the top cover 15 can be directly rotated forward or reversely under the condition that the clamping ring 21 is clamped into the clamping groove 20, so that the top cover 15 moves upwards or downwards along the axial direction of the rod body 1 under the action of the second external thread 17 and the second threaded hole 14, the axial moving height of the detection sleeve 6 along the rod body 1 is limited, the number of turns of the rod body 1 can be limited, the screw screwing-in depth is limited, and the adjustment operation is simple and convenient.
Before the screw is needed to be implanted, the pressing plate 22 is pressed to one side close to the detection sleeve 6, the warping part 23 is stressed to generate elastic deformation, when the clamping ring 21 is separated from the clamping groove 20, the second limiting rib 29 is clamped into the second limiting groove 27, the rotary knob 2 can be rotated at the moment, when the clamping ring 21 and the clamping groove 20 generate a height difference, the pressing of the pressing plate 22 can be loosened, in this state, the clamping ring 21 is abutted to the outer side of the detection sleeve 6, the warping part 23 keeps deforming, meanwhile, the second limiting rib 29 keeps clamping with the second limiting groove 27, and therefore, the detection sleeve 6 or the top cover 15 is limited by the limiting part 32, only one of the detection sleeve 15 or the top cover 15 can move in the same time, and the other is prevented from moving due to mistaken touch in the process of adjusting the top cover 15 or the detection sleeve 6, so that the accuracy of screw screwing depth is guaranteed. The arrangement can also ensure that the detection sleeve 6 always keeps at the zero scale mark in the state of not pressing the pressing plate 22 after the adjustment of the device is completed, so that the use convenience of the device is improved.
As shown in fig. 8, the top of the extension portion 28 is provided with a wing plate 30, the wing plate 30 is arc-shaped, and the inner diameter of the wing plate 30 is the same as the outer diameter of the top cover 15, so that when the knob 2 is rotated, the wing plate 30 is tightly attached to the outer surface of the top cover 15, the probability of rotation of the top cover 15 due to unexpected stress is reduced, the limit stability of the top cover 15 is further improved, and the screwing precision of a screw is guaranteed.
As shown in fig. 5 and 9, the middle part of the column 16 is provided with a first through hole 24 coaxial with the rod body 1, and the inner diameter of the first through hole 24 is larger than the outer diameter of the rod body 1, so that the advantage of the arrangement is that friction is avoided between the rod body 1 and the first through hole 24 when the knob 2 drives the rod body 1 to rotate, and the rotation resistance of the rod body 1 is reduced.
As shown in fig. 7, the bottom of the first limiting groove 11 is provided with a guiding opening, which has the advantage of improving the fault tolerance of the first limiting rib 10 clamped into the first limiting groove 11 when the holding sleeve 9 is sleeved on the detecting sleeve 6, and improving the installation convenience of the holding sleeve 9.
As shown in fig. 6, the first elastic element 19 is a conical spring and is sleeved outside the rod body 1, so that the advantage of the arrangement is that when the detection sleeve 6 approaches to the column body 16 along the axial direction of the rod body 1, the detection sleeve 6 firstly collides with the bottom of the first elastic element 19 and gradually extrudes the first elastic element 19, the compressed first elastic element 19 orderly collapses and increases the reaction force to the detection sleeve 6, and compared with a straight cylindrical spring, the conical spring can orderly collapse into a disc shape after being stressed, the movable space of the detection sleeve 6 is effectively increased, the integral reserved length of the device is reduced, deformation damage caused by disordered collapse of the detection sleeve is avoided, and the service life of the first elastic element 19 is ensured.
As shown in fig. 7 and 8, the bottom of the column 16 is provided with a first relief groove 25, the top and the bottom of the detection sleeve 6 are provided with a second relief groove 26, after the detection sleeve 6 collides with the column 16, the height of a cavity formed between the first relief groove 25 and the second relief groove 26 is matched with the diameter of the first elastic element 19, so that when the spiral first elastic element 19 collapses into a disc shape, the edges of the first relief groove 25 and the second relief groove 26 collide with each other, and a cavity for accommodating the first elastic element 19 is generated through the first relief groove 25 and the second relief groove 26, so that excessive extrusion of the first elastic element 19 is avoided, the service life of the first elastic element 19 is prolonged, and the service stability of the first elastic element 19 is ensured.
As shown in fig. 6, the bottom of the detecting sleeve 6 is provided with a second elastic member 31, the second elastic member 31 is a conical spring and is sleeved outside the rod body 1, one end of the second elastic member 31 away from the detecting sleeve 6 is abutted against the bearing 8, when the zero scale of the first scale 12 is displayed at the window 13, if the rotation direction of the knob 2 is wrong, the elastic support applied to the detecting sleeve 6 by the second elastic member 31 can be timely fed back to the knob 2, the probability of wrong operation is reduced, and further, when the detecting sleeve 6 moves to the lowest position along the axial direction of the rod body 1, the spiral second elastic member 31 collapses into a disc shape, so that the force applied by the detecting sleeve 6 and the bearing 8 on the second elastic member 31 can be evenly borne by all positions of the second elastic member 31, the second elastic member 31 is prevented from being damaged by extrusion, and the service life of the second elastic member 31 is prolonged.
As shown in fig. 3 and 4, the pressing plate 22 is disposed on one side of the window 13 and does not overlap with the window 13, which has the advantage of avoiding the pressing plate 22 from shielding the window 13 and reducing the interference when reading the number in the window 13.
The specific working process of the technical scheme provided by the invention is as follows:
When the screw is required to be implanted into a patient, the operator holds the holding sleeve 9 by one hand and screws the screwing handle 2 by the other hand, the screwing handle 2 drives the screw screwing unit to rotate through the rod body 1 and screws the screw into the affected part, in the process, the detection sleeve 6 moves to one side close to the screwing handle 2 along the axial direction of the rod body 1 under the action of the first external thread 5 and the first threaded hole 7 through the limitation of the first limiting groove 11 and the first limiting rib 10, so that the position of the first scale 12 relative to the window 13 is changed, and the setting enables the screw screwing depth to be read out through the scale rapidly and accurately, and the damage of the operation to the patient is reduced.
When the knob 2 is reversely rotated, the detection sleeve 6 moves along the axial direction of the rod body 1 towards the end far away from the knob 2, so that the accuracy and reliability of the numerical value read out through the first scale 12 and the window 13 when the knob 2 is reversely rotated are ensured.
Before the screw of screw in affected part will reach the preset position, first elastic component 19 contradicts with detecting sleeve 6, increase detecting sleeve 6's motion resistance through the elasticity of first elastic component 19 self, and then transmit this power to on the knob 2 through detecting sleeve 6 to realize the feedback function, the benefit of setting like this is, after first elastic component 19 contradicts with detecting sleeve 6, operating personnel perception resistance, can slow down the screwing speed, and observe whether first scale 12 of window 13 position department reaches the preset value, improve the security of operation through real-time feedback and detection.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.