CN111616785A - Bone screw capable of preventing retreat and slowly releasing nutrient solution - Google Patents
Bone screw capable of preventing retreat and slowly releasing nutrient solution Download PDFInfo
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- CN111616785A CN111616785A CN202010444799.9A CN202010444799A CN111616785A CN 111616785 A CN111616785 A CN 111616785A CN 202010444799 A CN202010444799 A CN 202010444799A CN 111616785 A CN111616785 A CN 111616785A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7061—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant for stabilising vertebrae or discs by improving the condition of their tissues, e.g. using implanted medication or fluid exchange
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7062—Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs ; Tools for such devices
- A61B17/7064—Devices acting on, attached to, or simulating the effect of, vertebral facets; Tools therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7094—Solid vertebral fillers; devices for inserting such fillers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8625—Shanks, i.e. parts contacting bone tissue
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/864—Pins or screws or threaded wires; nuts therefor hollow, e.g. with socket or cannulated
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8685—Pins or screws or threaded wires; nuts therefor comprising multiple separate parts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B2017/564—Methods for bone or joint treatment
Abstract
A screw bolt for preventing and slowly releasing nutrient solution from retreating is characterized in that a nut head is provided with a coaxial inner hole, one end of the inner hole, far away from a screw rod, is provided with an opening and is provided with a coaxial blind hole, the inner hole and the screw rod are internally provided with the coaxial blind hole, and the blind hole is close to one end of the nut head, is provided with the opening and is communicated with the inner hole; an inner rod is inserted into the blind hole, a plurality of fixing needles are fixed on the inner rod, a through hole is formed in the screw rod and comprises an upper through hole and a lower through hole, a spiral flow deflector is fixed on the inner rod, the fixing needles on the inner rod are positioned in the lower through hole, when the bottom end of the inner rod contacts the bottom surface of the blind hole, the free ends of the fixing needles are positioned in the through hole, and when the inner rod moves towards the direction of the nut head, the free ends of the fixing needles can extend out of the through hole and are inserted into bones; solid nutrition factor particles are filled between the spiral flow deflector and the inner wall of the blind hole, a liquid bag is fixed in the nut head, and the liquid bag can be punctured when the traction part pulls the inner rod to drive the solid nutrition factor particles to flow. The bone screw can prevent withdrawal and has the slow release function of nutrient solution.
Description
Technical Field
The invention relates to a bone screw for spinal surgery, in particular to a bone screw capable of releasing nutrient solution to bones.
Background
The use of bone screws in spinal surgery is increasingly required, on the one hand, for effective fixation of bones, and on the other hand, more and more functions are sought after, such as the release of nutrient solutions to bones to accelerate their growth and to shorten the duration of pain.
For effective fixation, it is often desirable that the screw function to prevent axial back-off. Bone screws are used to connect fractured bones or to correct various skeletal pathologies and deformities. Broken bones or multiple vertebrae connected by bone screws are connected by rigid connecting members, so that the movement or stress of the bones can transfer stress to the bone screws, and the stress is concentrated on the contact surfaces between the bone screws and the bones.
The direction of stress can be decomposed into axial direction and radial direction, and radial force is tested on the bending strength of the bone screw, so that the bone screw can not deform or break under the radial force. The axial force is tested by the holding force of the bone screw, namely, the bone screw cannot make axial displacement. If the axial position exists, the positioning is unstable, and the operation is failed directly.
In practice, axial displacement is a common problem, and in the prior art, in order to avoid axial displacement of the bone screw, the bone screw is separated from a fixed position, and in the prior art, the screw body is arranged to be tapered, and the external diameter of the thread is kept consistent. Thus, the thread width at the tip is larger and the thread width at the tail is smaller. Its purpose is in order to place bone screw axial displacement, but discovery during actual experiment and use, because most advanced screw thread is wideer, and most advanced will follow the opening of core hole and rotate the cecum that gets into the core hole always, can rotate out the thread gap of marking out by the widest screw thread on the core hole inner wall like this, keep away from most advanced screw thread like this and can't fill the thread gap completely for the screw thread combines inseparably with core hole inner wall, leads to the screw to rotate easily, and then leads to axial displacement, breaks away from fixed position.
In the prior art, chinese patent (CN103845110B a multifunctional bone screw for poor bone conditions) discloses the following technical solutions: the self-locking type expansion rod consists of an outer screw and a self-locking type expansion rod, wherein the outer screw is formed into a whole by a screw body and a base, a cylindrical hollow part is arranged in the screw body, a slit cut along the longitudinal axis of the screw body is arranged at the tip part of the screw body, circular gradually-changed interface strengthening holes are symmetrically arranged on the slit at intervals along the pitch of an external thread, the interface strengthening holes are communicated with the cylindrical hollow part, and the aperture of the gradually-changed interface strengthening holes is sequentially reduced backwards from the tip part of the screw body; the self-locking type spreading rod is a cylinder, the diameter of the self-locking type spreading rod is slightly smaller than the inner diameter of the cylindrical hollow part in the nail body, the front end of the self-locking type spreading rod is conical, an inward V-shaped groove is formed in the rear part of the cone, and the self-locking type spreading rod is matched with the cylindrical hollow part in the nail body after being placed into the cylindrical hollow part of the nail body; the self-locking is realized at the same time of propping open the crack on the screw body, as shown in fig. 1, the bottom end of the outer screw is propped open by the propping rod, although the contact angle between the bottom end of the screw and the inside of the bone can be changed, and the resistance of axial movement is increased, on one hand, the bottom end is propped open to easily cause secondary damage to the bone, on the other hand, the propping rod moves downwards to bend the outer screw and pushes the bone to the two sides, the required force is large, and how to apply proper stress, so that the secondary damage to the damaged bone is avoided, and the difficulty of the operation is too high.
In the prior art, chinese patent (CN201210537131.4 pedicle screw and thoracolumbar anterior internal fixation system) discloses the following technical solutions: the pedicle screw further comprises a gasket, a circumferential groove is formed in one end, which borders the head, of the screw rod, the gasket is buckled in the circumferential groove, the gasket can rotate around the longitudinal axis of the screw rod relative to the screw rod, and the upper surface of the gasket abuts against the bottom surface of the head. The bottom end of the spacer contains a fixed pin for pressing into the vertebral body. The diameter of the gasket cannot be set too large due to the small aperture of the core hole, and the pin pressed into the cone is only a few millimeters away from the core hole, so that a crack is easily formed between the pressed hole of the pin and the core hole, and secondary damage is caused. Furthermore, the washer shim is rotatable relative to the screw about the longitudinal axis of the screw and does not mean that the shim is not subjected to the stresses imposed by the rotation of the screw. The screw rubs with the gasket during rotation, and circumferential stress around the axis is applied to the cone through the pin, so that the probability of forming a crack between the pressing hole of the pin and the core hole is further increased.
For the release of nutrient components, in the prior art, as shown in chinese patent (CN201310018015.6, an absorbable bone screw with slow release of biological factors and a preparation method thereof), the key point of the technical scheme is that a 1 um-50 um porous structure is arranged on the bottom of a thread and/or on the thread below one third of the distance from the root of the thread, and the porous structure carries the slow release biological factor rhBMP-2. Although the screw can release nutrient components, the production cost of the screw is too high, the requirements on transportation and storage are very high, and the slow release factors can fall off due to high temperature or vibration. Therefore, its application is difficult.
Disclosure of Invention
The invention aims to provide a bone screw capable of preventing the screw from moving axially and separating from a fixed position and releasing nutrient solution to a wound surface.
In order to realize the purpose, the invention comprises a main body, the main body comprises a nut head and a screw rod, the nut head and the screw rod are coaxial, the nut head is fixedly connected with one end of the screw rod, one end of the screw rod far away from the nut head is provided with a conical head,
the nut head is provided with a coaxial inner hole, one end of the inner hole, which is far away from the screw rod, is opened, a blind hole which is coaxial with the inner hole and is opened at one end of the screw rod, which is close to the nut head, is opened and is communicated with the inner hole;
an inner rod is inserted into the blind hole, a plurality of fixing needles are fixed on the inner rod, the plane where the axes of the fixing needles are located can be overlapped with the axis of the inner rod, the included angle between the part from the connecting point of the fixing needle on the screw rod and the inner rod to the connecting part of the screw rod and the nut head and the fixing needles is 36-57 degrees, the fixing needles are made of metal, and the maximum diameter of the fixing needles is not more than 1 mm;
the screw is provided with through holes which comprise upper through holes and lower through holes, the lower through holes are positioned at the lower part of the screw, the number of the lower through holes is 4-8, and the openings positioned on the outer wall of the screw are positioned between the threads and are inclined upwards;
the upper through holes are continuously arranged from the top of the screw rod to the upper part of the lower through hole, the inner rod is fixedly provided with a spiral flow deflector, the outer diameter of the spiral flow deflector is smaller than the maximum inner diameter of the blind hole, the difference is within the range of 0.1-0.5mm, and the opening of the upper through hole on the outer wall of the screw rod is inclined downwards;
when the bottom end of the inner rod contacts the bottom surface of the blind hole, the free end of the fixing needle is positioned in the through hole, and when the inner rod moves towards the direction of the nut head, the free end of the fixing needle can extend out of the through hole and is inserted into a bone;
the inner hole comprises a cylindrical hole and an inverted cone hole which are coaxial, the cylindrical hole is positioned on the upper side of the inverted cone hole, the inner diameter of the cylindrical hole is the same as the diameter of the top edge of the inverted cone hole, a drawing assembly is fixed in the inner hole and comprises a sealing ring, a spherical metal sheet, a baffle ring, a puncture needle, a liquid sac and a sealing plug, the spherical metal sheet protrudes downwards when a screw is not used, the baffle ring is fixed on the inner wall of the inverted cone hole, the top edge of the spherical metal sheet abuts against the baffle ring to realize the positioning of the spherical metal, the puncture needle is fixed on the upper surface of the spherical metal sheet, the axis of the puncture needle is vertical to the surface of the spherical metal sheet, the liquid sac is an annular liquid sac filled with physiological saline, the outer annular surface of the sealing ring is fixedly connected with the top of the cylindrical hole in a sealing manner, the top surface of the liquid sac abuts against the sealing, the sealing plug is used for sealing an inner ring hole of the sealing ring;
the drawing assembly also comprises a traction component of the spherical metal sheet, and the traction component is used for changing the protruding direction of the spherical metal sheet into upward protruding;
solid nutritional factor particles are filled between the spiral flow deflector and the inner wall of the blind hole, and the particle size is within the range of 0.075-0.1 mm.
Further, the traction part comprises a spherical metal sheet, a cooling liquid bag and a liquid flow pipe group; the spherical metal sheet is a temperature sensing sheet which protrudes upwards within the temperature range of 30-36 ℃ and protrudes downwards below 30 ℃;
the liquid flow pipe group penetrates through the sealing ring and extends out of the nut head, and the liquid flow pipe group comprises a liquid inlet pipe and a liquid discharge pipe.
Preferably, the temperature sensing sheet is a memory metal.
Preferably, the expansion coefficient of the metal sheet positioned on the upper side of the temperature sensing strip bimetal is smaller than that of the metal sheet positioned on the lower side of the temperature sensing strip bimetal.
Furthermore, the traction part comprises a screw rod group, the screw rod group is in threaded connection with the annular hole of the sealing ring, the screw rod group comprises an upper screw rod and a lower screw rod, the upper screw rod and the lower screw rod can synchronously rotate through a limiting structure, and the upper screw rod and the lower screw rod can be axially separated.
Preferably, the limiting structure is a pin shaft and a pin hole which are matched with each other, or a lug is matched with a groove with a corresponding shape.
Furthermore, the lower screw rod is provided with a liquid injection hole communicated with the upper surface and the lower surface.
Furthermore, the blind hole extends into the conical head, but the inner diameter of the blind hole in the conical head is slightly larger than the outer diameter of the inner rod, and the range of the blind hole is 0.2-0.5 mm.
The invention has the advantages that the holding force of the screw can be effectively improved, the screw is prevented from being pushed out of a fixed position, and meanwhile, nutrient solution can be effectively released into bones to accelerate healing. And the operation is very simple.
Drawings
Fig. 1 is a schematic view of the main structure.
Fig. 2 is a sectional view of fig. 1.
FIG. 3 is an enlarged view of a portion of FIG. 2A and a drawing assembly according to a first embodiment.
Fig. 4 is a partially enlarged view of fig. 2B.
Fig. 5 is a schematic view of a second drawing assembly.
Fig. 6 is a schematic view showing a state where the fixing pin is protruded out of the through hole.
Figure 7 is a schematic view of a second alternative drawing assembly configuration.
Figure 8 is a variation of the first embodiment of the pulling assembly.
Fig. 9 is a schematic view of the structure of the liquid sac matching with the spherical metal sheet.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 9, a bone screw for preventing withdrawing and slowly releasing nutrient solution, includes a main body 10, the main body 10 includes a nut head 19 and a screw rod 11, the nut head 19 and the screw rod 11 are coaxial, the nut head 19 is fixedly connected with one end of the screw rod 11, one end of the screw rod 11 far away from the nut head 19 is provided with a conical head 14, and the bone screw is characterized in that:
the nut head 19 is provided with a coaxial inner hole 15, one end of the inner hole 15, which is far away from the screw rod 11, is opened, a blind hole 18 which is coaxial with the inner hole 15 and is arranged in the screw rod 11, and one end of the blind hole 18, which is close to the nut head 19, is opened and is communicated with the inner hole 15;
an inner rod 30 is inserted into the blind hole 18, a plurality of fixing needles 31 are fixed on the inner rod 30, the plane where the axes of the fixing needles 31 are located can coincide with the axis of the inner rod 30, the included angle between the part from the connecting point of the fixing needle 31 and the inner rod 30 on the screw rod 11 to the connecting part of the screw rod 11 and the nut head 19 and the fixing needle 31 is 36-57 degrees, the fixing needle 31 is made of metal, the maximum diameter of the fixing needle is not more than 1mm, the fixing needle is preferably bendable and has better elasticity, and the included angle alpha of the connecting line between the two end points and the highest bending point is 147 degrees;
the screw 11 is provided with through holes 12 which comprise upper through holes 121 and lower through holes 122, the lower through holes 122 are positioned at the lower part of the screw 11, the number of the lower through holes is 4-8, and the openings positioned on the outer wall of the screw 11 are positioned between the threads and are inclined upwards;
the upper through hole 122 is continuously arranged from the top of the screw rod 11 to the upper part of the lower through hole 121, the inner rod 30 is fixed with the spiral flow deflector 32, the outer diameter of the spiral flow deflector 32 is smaller than the maximum inner diameter of the blind hole, the difference is within the range of 0.1-0.5mm, and the opening of the upper through hole 122 on the outer wall of the screw rod 11 inclines downwards;
the fixing needle 31 on the inner rod 30 is positioned in the lower through hole 121, when the bottom end of the inner rod 30 contacts the bottom surface of the blind hole 18, the fixing needle 31 is completely positioned in the through hole 12, and when the inner rod 30 moves towards the nut head 19, the free end of the fixing needle 31 can extend out of the through hole 12 and be inserted into a bone;
the inner hole 15 comprises a cylindrical hole and an inverted cone-shaped hole which are coaxial, the cylindrical hole is positioned on the upper side of the inverted cone-shaped hole, the inner diameter of the cylindrical hole is the same as the diameter of the top edge of the inverted cone-shaped hole, a drawing assembly 20 is fixed in the inner hole and comprises a sealing ring 21, a spherical metal sheet 23, a baffle ring 22, a puncture needle 28, a liquid sac 27 and a sealing plug, the spherical metal sheet 23 protrudes downwards when a screw is not used, the baffle ring 22 is fixed on the inner wall of the inverted cone-shaped hole, the top edge of the spherical metal sheet 23 is abutted against the baffle ring 22 to realize the positioning of the spherical metal 23, the puncture needle 28 is fixed on the upper surface of the spherical metal sheet 23, the axis of the puncture needle 28 is vertical to the surface of the spherical metal sheet 23, the liquid sac 27 is an annular liquid sac filled with physiological saline, the outer annular surface of the sealing ring 21 is fixedly connected with the top of the cylindrical hole 15 in a sealing manner, the top surface of the, the sealing plug is used for sealing the inner ring hole of the sealing ring 21 to avoid being punctured;
the drawing assembly 20 further comprises a drawing member of the spherical metal sheet 23 for changing the protruding direction of the spherical metal sheet 23 to be upwardly protruded.
Solid nutrition factor particles are filled between the spiral flow deflector 32 and the inner wall of the blind hole, the particle size is in the range of 0.075-0.1mm, and the nutrition factors are mainly used for accelerating the production of bones, such as a biological factor rhBMP-2.
The diameter of the upper through hole cannot be too small, otherwise the liquid cannot flow out due to the surface tension of the liquid in the hole, so that the diameter of the upper through hole is in the range of 0.3-1mm, preferably 0.5-0.6mm, and the liquid flows downwards after all because the top of the screw 11 is not known by the upper through hole, and the upper through hole at the top actually plays a role in balancing the internal and external pressures of the screw, so that the liquid can smoothly flow out.
Because the screw is internally provided with the solid particles, the screw is preferably sealed and packaged before use, so that the solid particles are prevented from falling off due to collision in transportation or use.
The slow release function achieved by the liquid and the solid particles is much lower than the cost of embedding the particles on the surface of the screw.
The form of the traction component can be various:
as shown in fig. 3, the traction component includes a spherical metal sheet 23, a cooling liquid bag 25, a liquid flow tube group 24; the spherical metal sheet 23 is a temperature sensing sheet, and protrudes upwards within the temperature range of 30-36 ℃, and protrudes downwards below 30 ℃;
in order to cooperate with the operation of the temperature sensing piece, the temperature sensing piece is further provided with a cooling liquid bag 25, the cooling liquid bag 25 is tightly attached to the temperature sensing piece, the cooling liquid bag 25 is communicated with a liquid flow pipe group 24, the liquid flow pipe group 24 penetrates through a sealing ring 21 and extends out of a nut head 19, the liquid flow pipe group 24 comprises a liquid inlet pipe and a liquid outlet pipe, the cooling liquid bag is used for introducing cold liquid, the temperature sensing piece is enabled to protrude towards the screw rod, a fixing needle is kept to be completely positioned in a through hole 12, when the screw is completely screwed into a preset position, the cooling liquid bag is drawn out, the temperature sensing piece 23 can be deformed by the temperature of a human body and protrudes towards the direction far away from the screw rod 11, the inner rod 30 is driven to move, the fixing needle 31 is pulled out of the through hole 12 to be inserted into a bone, the puncture. In order to increase the amount of the normal saline, after the cooling liquid sac 25 is drawn out, the normal saline is injected through the sealing ring 21, then the inner ring hole of the sealing ring 21 is quickly blocked by the sealing plug, and when the temperature sensing sheet drives the puncture needle 28 to puncture the liquid sac 27, the pressure inside the screw is mainly increased, so that the nutrient solution can be in full contact with the wound surface of the bone or a plurality of tiny cracks, and the application effect is improved.
The material of the temperature sensing piece has two choices, one is memory metal, and the temperature sensing piece is deformed at 30-36 ℃; the other is to use a bimetallic strip, because of different expansion coefficients, when the temperature of the two spherical metal strips rises within the range of 30-36 degrees, the expansion coefficient of the metal strip positioned above is small, and the expansion coefficient of the metal strip positioned below is large, so that the metal strip tends to protrude towards the direction far away from the screw rod 11, and the temperature sensing strip protrudes towards the direction far away from the screw rod 11 to pull the inner rod 30.
As shown in fig. 5, another implementation manner of the pulling component includes a screw set 24, the screw set 24 is in threaded connection with the annular hole of the sealing ring, the screw set 24 includes an upper screw 241 and a lower screw 242, and the upper screw 241 and the lower screw 242 can synchronously rotate through a limiting structure and can be axially separated. The limiting structure can be a pin shaft and a pin hole which are used in a matched mode, or a lug is matched with a groove with a corresponding shape, so that the lower screw 242 can synchronously rotate when the upper screw 241 is rotated; the bottom end of the lower screw 242 is fixedly connected with the center of the spherical metal sheet 23 through a connecting rod 25. Thus, the upper screw 241 is rotated to move the screw group 24 in a direction away from the screw 11, the connecting rod 25 is pulled to drive the inner rod 30 to move, the fixing needle 31 extends out of the through hole 12 and is inserted into the bone, finally, the upper screw 241 can be taken out, the sealing plug is screwed into the inner ring of the sealing ring 21, and the lower screw 241 can be provided with a liquid injection hole communicating the upper surface and the lower surface for injecting physiological saline into the blind hole.
Of course, in order to reduce the volume of the nut head, the drawing assembly may extend into the screw, that is, the screw group 24 extends into the screw 11, and the top end of the screw 11 is provided with corresponding internal threads, so that the size of the nut head can be effectively reduced when the screw group 24 extends into the screw, as shown in fig. 7.
In addition, the first drawing assembly can also reduce the size of the nut head, the maximum aperture of the inner hole 15 is set to be the same as or slightly larger than the aperture of the blind hole, and the temperature sensing piece and the metal piece both extend into the blind hole, as shown in fig. 8. With the arrangement, the diameter of the screw is slightly larger than that of a common screw, because the deformation of the temperature sensing piece is directly related to the diameter of the temperature sensing piece, and if the deformation is too small, the length of the fixing needle extending out of the through hole is not enough, the fixing anti-backing effect is poor.
As shown in fig. 4 and 6, the structure of the through hole 12 has a direct influence on the shape of the extended fixing needle, if the through hole 12 is a cylindrical or conical hole, the axis of the through hole is parallel to the axis of the fixing needle, so that the fixing needle 31 moves upwards along with the inner rod, the fixing needle 31 deforms at the fixing position of the fixing needle 31 and the inner rod 30, the change of the included angle between the fixing needle 31 and the inner rod is not large, and the anti-retreat effect of the fixing needle 31 is very good due to the structure.
However, if the top wall of the through hole 12 is formed into two ends, the acute angle between the end close to the outer wall of the screw and the axis of the screw and the acute angle between the end close to the inner wall of the screw and the axis of the screw are on the same side of the top wall of the through hole 12, the acute angle between the end close to the outer wall of the screw and the axis of the screw is larger than the acute angle between the end close to the inner wall of the screw and the axis of the screw, the acute angle between the end close to the outer wall of the screw and the axis of the screw is between 70 and 90 degrees, and the acute angle between the end close to the inner wall of the screw and the axis of the screw. Set up like this, fixed needle 31 also can take place to buckle at the middle part, makes the angle grow of the acute angle in the contained angle between the threaded hole inner wall in fixed needle blank end and the skeleton, can be favorable to preventing the rotation of screw rod like this, plays better preventing and moves back the effect.
As shown in fig. 2, the blind hole extends into the conical head 14 for better positioning of the inner rod, but the inner diameter of the part of the blind hole in the conical head is slightly larger than the outer diameter of the inner rod, in the range of 0.2-0.5 mm. In this way, the inner rod 30 is inserted into the blind hole in the head 14, without wobbling when the screw is screwed into the bone, avoiding the fixation pin 31 interfering with the operation.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a prevent moving back bone screw of slowly-releasing nutrient solution, includes the main part, and the main part includes nut head and screw rod, and nut head and screw rod are coaxial, nut head and screw rod one end fixed connection, and the one end that the nut head was kept away from to the screw rod has conical head, its characterized in that:
the nut head is provided with a coaxial inner hole, one end of the inner hole, which is far away from the screw rod, is opened, a blind hole which is coaxial with the inner hole and is opened at one end of the screw rod, which is close to the nut head, is opened and is communicated with the inner hole;
an inner rod is inserted into the blind hole, a plurality of fixing needles are fixed on the inner rod, the plane where the axes of the fixing needles are located can be overlapped with the axis of the inner rod, the included angle between the part from the connecting point of the fixing needle on the screw rod and the inner rod to the connecting part of the screw rod and the nut head and the fixing needles is 36-57 degrees, the fixing needles are made of metal, and the maximum diameter of the fixing needles is not more than 1 mm;
the screw is provided with through holes which comprise upper through holes and lower through holes, the lower through holes are positioned at the lower part of the screw, the number of the lower through holes is 4-8, and the openings positioned on the outer wall of the screw are positioned between the threads and are inclined upwards;
the upper through holes are continuously arranged from the top of the screw rod to the upper part of the lower through hole, the inner rod is fixedly provided with a spiral flow deflector, the outer diameter of the spiral flow deflector is smaller than the maximum inner diameter of the blind hole, the difference is within the range of 0.1-0.5mm, and the opening of the upper through hole on the outer wall of the screw rod is inclined downwards;
when the bottom end of the inner rod contacts the bottom surface of the blind hole, the free end of the fixing needle is positioned in the through hole, and when the inner rod moves towards the direction of the nut head, the free end of the fixing needle can extend out of the through hole and is inserted into a bone;
the inner hole comprises a cylindrical hole and an inverted cone hole which are coaxial, the cylindrical hole is positioned on the upper side of the inverted cone hole, the inner diameter of the cylindrical hole is the same as the diameter of the top edge of the inverted cone hole, a drawing assembly is fixed in the inner hole and comprises a sealing ring, a spherical metal sheet, a baffle ring, a puncture needle, a liquid sac and a sealing plug, the spherical metal sheet protrudes downwards when a screw is not used, the baffle ring is fixed on the inner wall of the inverted cone hole, the top edge of the spherical metal sheet abuts against the baffle ring to realize the positioning of the spherical metal, the puncture needle is fixed on the upper surface of the spherical metal sheet, the axis of the puncture needle is vertical to the surface of the spherical metal sheet, the liquid sac is an annular liquid sac filled with physiological saline, the outer annular surface of the sealing ring is fixedly connected with the top of the cylindrical hole in a sealing manner, the top surface of the liquid sac abuts against the sealing, the sealing plug is used for sealing an inner ring hole of the sealing ring;
the drawing assembly also comprises a traction component of the spherical metal sheet, and the traction component is used for changing the protruding direction of the spherical metal sheet into upward protruding;
solid nutritional factor particles are filled between the spiral flow deflector and the inner wall of the blind hole, and the particle size is within the range of 0.075-0.1 mm.
2. The bone screw capable of preventing and releasing nutrient solution backwards and forwards as claimed in claim 1, wherein the traction component comprises a spherical metal sheet, a cooling fluid bag and a fluid pipe set; the spherical metal sheet is a temperature sensing sheet, and protrudes upwards within the temperature range of 30-36 ℃, and protrudes downwards below 30 ℃;
the liquid flow pipe group penetrates through the sealing ring and extends out of the nut head, and the liquid flow pipe group comprises a liquid inlet pipe and a liquid discharge pipe.
3. The bone screw capable of preventing backward-moving and slowly-releasing nutrient solution as claimed in claim 2, wherein the temperature sensing plate is a memory metal.
4. The bone screw for preventing and releasing nutrient solution backward as claimed in claim 2, wherein the thermal sensing bimetal has a smaller expansion coefficient of the metal plate located at the upper side than that of the metal plate located at the lower side.
5. The bone screw capable of preventing retreat and releasing nutrient solution according to claim 1, wherein the traction component comprises a screw group, the screw group is in threaded connection with the annular hole of the sealing ring, the screw group comprises an upper screw and a lower screw, and the upper screw and the lower screw can synchronously rotate through a limiting structure and can be axially separated.
6. The bone screw capable of preventing and releasing nutrient solution backward as claimed in claim 5, wherein the limiting structure is a pin and a pin hole used cooperatively, or a projection and a groove of corresponding shape.
7. The bone screw capable of preventing retreat and releasing nutrient solution according to claim 5, wherein the lower screw rod is provided with a liquid injection hole communicating the upper surface and the lower surface.
8. The bone screw capable of preventing recession and releasing the nutrient solution as claimed in any one of claims 1 to 7, wherein the blind hole extends into the bit, but the inner diameter of the portion of the blind hole inside the bit is slightly larger than the outer diameter of the inner rod, and is in the range of 0.2 to 0.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010444799.9A CN111616785B (en) | 2020-05-23 | 2020-05-23 | Bone screw capable of preventing retreat and slowly releasing nutrient solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010444799.9A CN111616785B (en) | 2020-05-23 | 2020-05-23 | Bone screw capable of preventing retreat and slowly releasing nutrient solution |
Publications (2)
| Publication Number | Publication Date |
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| CN111616785A true CN111616785A (en) | 2020-09-04 |
| CN111616785B CN111616785B (en) | 2022-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010444799.9A Expired - Fee Related CN111616785B (en) | 2020-05-23 | 2020-05-23 | Bone screw capable of preventing retreat and slowly releasing nutrient solution |
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| CN207679519U (en) * | 2017-06-23 | 2018-08-03 | 西安青苗生物科技有限公司 | A kind of ilium screw assembly |
| US20190125409A1 (en) * | 2016-04-20 | 2019-05-02 | Dignity Health | Systems and methods for a pedicle screw assembly |
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| US20080039846A1 (en) * | 2006-08-10 | 2008-02-14 | Shih-Tseng Lee | Expansion screw set and hollow nail and interior nail thereof |
| US20130310883A1 (en) * | 2012-05-16 | 2013-11-21 | Mark M. Levy | Expandable bone fixation element |
| CN103860246A (en) * | 2012-12-12 | 2014-06-18 | 上海微创骨科医疗科技有限公司 | Vertebral pedicle screw and thoracolumbar spine anterior internal fixing system |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN111616785B (en) | 2022-01-28 |
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Effective date of registration: 20220110 Address after: 510630 No. 601, Huangpu Avenue West, Tianhe District, Guangzhou, Guangdong Applicant after: Jinan University Address before: 221100 shop 31-119, Fuyuan Park, Tongshan District, Xuzhou City, Jiangsu Province Applicant before: Xuzhou Changfeng Biotechnology Co.,Ltd. |
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