WO2019072355A1 - The cannulated fenestrated valved screws - Google Patents

The cannulated fenestrated valved screws Download PDF

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Publication number
WO2019072355A1
WO2019072355A1 PCT/EG2018/000018 EG2018000018W WO2019072355A1 WO 2019072355 A1 WO2019072355 A1 WO 2019072355A1 EG 2018000018 W EG2018000018 W EG 2018000018W WO 2019072355 A1 WO2019072355 A1 WO 2019072355A1
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WO
WIPO (PCT)
Prior art keywords
screw
cannulated
valved
fenestrated
screws according
Prior art date
Application number
PCT/EG2018/000018
Other languages
French (fr)
Inventor
Ahmed Mohamed ELKHAWAGA
Original Assignee
Elkhawaga Ahmed Mohamed
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of WO2019072355A1 publication Critical patent/WO2019072355A1/en

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Classifications

    • 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
    • A61B17/8605—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
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8802—Equipment for handling bone cement or other fluid fillers
    • A61B17/8805—Equipment for handling bone cement or other fluid fillers for introducing fluid filler into bone or extracting it
    • A61B17/8816—Equipment for handling bone cement or other fluid fillers for introducing fluid filler into bone or extracting it characterised by the conduit, e.g. tube, along which fluid flows into the body or by conduit connections
    • 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
    • A61B17/863—Shanks, i.e. parts contacting bone tissue with thread interrupted or changing its form along shank, other than constant taper
    • 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
    • A61B2017/561—Implants with special means for releasing a drug

Definitions

  • This disclosure is used in orthopedic surgeries to deliver medication to the bone in patients with serious bone infections, bone defects and local bone tumors.
  • the gold standard method was using the bone cement (polymethyl methacrylate PMMA) as an incubator for the antibiotic but after degradation of antibiotic it becomes a foreign body and the patient should undergo to another surgery for its removal with probability of inability of complete removal and retaining of the cement with its further complications
  • a type of delivery of medication taking the shape of a fenestrated needle or screw that exposed to clogging of its orifices with advancement of the device at time of introduction or even later on because of bone over growth.
  • the soft tissue thickness overlying target bone may interfere with secure introduction of the device and in some cases may need a custom made length of the device for fear of drowning device in soft tissues or compression of its head on the skin causing skin necrosis with subsequent infection.
  • the device is neither suitable for all bones nor all parts of the same bone.
  • Devices used to inject bone cement in cases of augmented fracture reduction or to fill a void space carry the risk of probable revision after infection with disastrous loss of that bone and exposing the patient to neurovascular complications especially in spinal procedures.
  • Cannulated screws used as an intraossous accesses bear the risk of extraossous infiltration of medication to the surroundings of the target bone because of cannulation or fenestration of the whole length of such screw.
  • some embodiments lack the valving mechanism that causes leakage of medication and even medullary contents and air embolism that necessitate a cap to close of such screws.
  • the Cannulated Fenestrated Valved Screws are composed of: 1) Injection system (Fig.l) :
  • a- Injection schanz (1) which is a long cannulated screw arranged in composition from above downwards as follows:
  • the neck of the schanz (1-B) is short circular part lies just below that said threaded part and it gives enough space for easy closure and tightening of the cap (5).
  • the nut part (1-D) of the screw is hexagonal in shape to fit with the wrench for easy tightening of the screw or removal.
  • the stem (1-F) of the screw is circular in shape to be easy fixed to an external fixator if needed.
  • This threaded part is divided into three thirds.
  • the upper third is cannulated (1-E) and fits in with the near cortical bone.
  • the middle third is cannulated (1-E) and fenestrated (1-H, I & J) and all this part is medullary.
  • the upper fenestration (1-H) is oval in shape at the beginning of this middle third at 12 O'clock, the middle oval (1-1) fenestration at 4 O'clock and it lies at the middle of the middle threaded part.
  • the lower oval fenestration (1-J) lies at the end of the middle threaded part at 8 O'clock where the inner cannulation of the screw ended below that point (1-K).
  • the lower threaded third is solid (1-L) and ended by the conical tapering part (1- M) of the screw to fit m the far cortex.
  • the dispenser (2) is cannulated object (2-A) arranged in composition from above downwards as follows: • The shoulder (2-B) which is circular part at the orifice of the cannulation to host the shoulder of the rubber plug (4-A).
  • the fenestration zone is opposing that of the schanz screw at 12 (2-F), 4 (2-G) and 8 (2-H) o'clock respectively.
  • the fenestrations are oval also but are characterized by hav g protrusions (2-1) at the upper part of every oval fenestration and perpendicular to the long axis of the dispenser. The length of those protrusions as that of threads of the lower threaded (1-G) part of the schanz.
  • That inner rubber seal (3) is circular rubber valve to prevent leakage of medication and for facilitation of locking and un-locking mechanism between schanz and dispenser. It is composed in cut section of external longer limb (3-B) having two square protrusions (3-D) and internal shorter limb (3-A) connected by two arches (3-C) from both sides and this occupies the distance between beveling of the screw and the upper inner part of dispenser. The two square protrusions occupy the two square pits (1-N) of the beveling of the screw. d- The outer rubber plug (4) is composed of:
  • Tail (4-C) fills the upper part of the inner surface of the dispenser
  • a- Drainage screw (6) which is a long cannulated (6-A) schanz screw arranged in composition from above downwards as follows:
  • the neck (6-E) of the drainage screw is circular short part and gives enough space for easy closure of the cap (8).
  • the nut part (6-F) is hexagonal in shape to fit with the wrench for easy installation of the screw or removal.
  • the stem of the screw (6-G) is circular in shape for easy fixation to external fixator if needed
  • the lower threaded part of the screw is threaded up to the tapering end (6-K).
  • This threaded part is divided into three thirds.
  • the upper third (6-H) is cannulated and fits in the near cortical bone.
  • the middle third is cannulated and has a fusiform hole (6-1) and all this part is medullary where the inner cannulation of the screw ended at lower end of this part.
  • the lower threaded part (6- J) is solid and ended by the conical tapering end of the screw to fit in the far cortex,
  • the cap (8) closes tile screw after using and is composed of:
  • connection (9) which formed of two endings (9-A) & (9-C) connected by a tube (9-E).
  • the larger end is to fit upper inner threads of the screw (6-D) and it is composed of upper outer small threads (9-C), neck (9- D) and a circular serrated bulb (9-B) for handling.
  • the other end (9-A) to fit with a suction device.

Abstract

The current invention seeks to provide surgeons with a new method to treat osteomyelitis or local bone diseases. This invention consists of a system for the injection and drainage of drugs from and to the bone and ban be used in the injection of solids such as bone graft and also can be used as a component of the external fixation, thus benefiting the patient from the advantages of concentration of medicine in the bones for long periods without need for another surgery.

Description

The Caiinulated Fenestrated Valved Screws
Technical Field
This disclosure is used in orthopedic surgeries to deliver medication to the bone in patients with serious bone infections, bone defects and local bone tumors.
Background Art
There are numbers of surgical procedures which involve the delivery of medication and other fluids into the bone of a patient.
The gold standard method was using the bone cement (polymethyl methacrylate PMMA) as an incubator for the antibiotic but after degradation of antibiotic it becomes a foreign body and the patient should undergo to another surgery for its removal with probability of inability of complete removal and retaining of the cement with its further complications
Other applications were targeting intraosseous medication to extraosseous causes only and use the medullary cavity as an access to the systemic circulation in emergencies in cases of multiple failed trials to access the patient's blood vessels in emergency rooms, in infancy and in wars for rapid life saving of the patients.
As these applications confined to be used in emergency only and for short durations their designs also confined to be fixed in one cortex of bone that may lead to loosening of the device with subsequent pulling crt and leakage of medication in soft tissues with its subsequent complications.
A type of delivery of medication taking the shape of a fenestrated needle or screw that exposed to clogging of its orifices with advancement of the device at time of introduction or even later on because of bone over growth.
There are also individual variations of the soft tissue thickness overlying target bone that may interfere with secure introduction of the device and in some cases may need a custom made length of the device for fear of drowning device in soft tissues or compression of its head on the skin causing skin necrosis with subsequent infection. Briefly the device is neither suitable for all bones nor all parts of the same bone.
Devices used to inject bone cement in cases of augmented fracture reduction or to fill a void space carry the risk of probable revision after infection with disastrous loss of that bone and exposing the patient to neurovascular complications especially in spinal procedures.
Many intraosseous accesses confined to intraoperative uses only and if used for continuous medications need another device that made process of remedy is complex and need expert to deal with such instruments.
Cannulated screws used as an intraossous accesses bear the risk of extraossous infiltration of medication to the surroundings of the target bone because of cannulation or fenestration of the whole length of such screw.
Also some embodiments lack the valving mechanism that causes leakage of medication and even medullary contents and air embolism that necessitate a cap to close of such screws.
Retained foreign bodies, implant or even cement in some cases are very hard to remove because bone marrow cells are highly active in nature and regenerate with high rates and any trial to introduce a fenestrated object among those cells for long durations would be occluded, hence losing its function.
Disclosure of the invention
The Cannulated Fenestrated Valved Screws are composed of: 1) Injection system (Fig.l) :
a- Injection schanz (1): which is a long cannulated screw arranged in composition from above downwards as follows:
• An upper threaded part (1-A) to be coupled with the threaded part of the inner aspect of the cap (5-B). • At the inner surface opposite the external upper threaded part there is beveling (1-C) composed of two arches and a connected by straight line with two square pits (1-N) acts as a bed to the dispenser dome protrusion movement. It acts also decrease loads on the three protrusions of the dispenser to avoid their breaking and prevents dislodgement of dispenser from the schanz.
• The neck of the schanz (1-B) is short circular part lies just below that said threaded part and it gives enough space for easy closure and tightening of the cap (5).
• The nut part (1-D) of the screw is hexagonal in shape to fit with the wrench for easy tightening of the screw or removal.
• The stem (1-F) of the screw is circular in shape to be easy fixed to an external fixator if needed.
• The lower threaded part (1-G) of the screw that is threaded until its tapering end (1-M). This threaded part is divided into three thirds. The upper third is cannulated (1-E) and fits in with the near cortical bone. The middle third is cannulated (1-E) and fenestrated (1-H, I & J) and all this part is medullary. The upper fenestration (1-H) is oval in shape at the beginning of this middle third at 12 O'clock, the middle oval (1-1) fenestration at 4 O'clock and it lies at the middle of the middle threaded part. The lower oval fenestration (1-J) lies at the end of the middle threaded part at 8 O'clock where the inner cannulation of the screw ended below that point (1-K). The lower threaded third is solid (1-L) and ended by the conical tapering part (1- M) of the screw to fit m the far cortex.
The dispenser (2) is cannulated object (2-A) arranged in composition from above downwards as follows: • The shoulder (2-B) which is circular part at the orifice of the cannulation to host the shoulder of the rubber plug (4-A).
• Below that shoulder there is a short neck (2-C) followed by a circular lock (2-D) which is dome shaped protrusion that fits in the beveling of the inner part of the shanz screw (1-C).
• Below the said circular dome the stem (2-E) begins until the oval fenestrations (2-F, G&H).
• The fenestration zone is opposing that of the schanz screw at 12 (2-F), 4 (2-G) and 8 (2-H) o'clock respectively. The fenestrations are oval also but are characterized by hav g protrusions (2-1) at the upper part of every oval fenestration and perpendicular to the long axis of the dispenser. The length of those protrusions as that of threads of the lower threaded (1-G) part of the schanz.
• When the dispenser dragged outwards out of the schanz screw the system is opened and the oval fenestrations of dispenser (2-F, G&H) and that of the schanz (1-H, I&J) are continuous with the cannulated cores (1-E & 2- A) of each. So we can inject a medication.
• When the dispenser is pushed inwards against the said schanz the dispenser protrusions (2-1) walked across the oval fenestrations (1-H, I&J) of the schanz and close the openings.
That inner rubber seal (3) is circular rubber valve to prevent leakage of medication and for facilitation of locking and un-locking mechanism between schanz and dispenser. It is composed in cut section of external longer limb (3-B) having two square protrusions (3-D) and internal shorter limb (3-A) connected by two arches (3-C) from both sides and this occupies the distance between beveling of the screw and the upper inner part of dispenser. The two square protrusions occupy the two square pits (1-N) of the beveling of the screw. d- The outer rubber plug (4) is composed of:
• A circular shoulder (4-A) that rests on the shoulder upper end of the dispenser.
• Tail (4-C) fills the upper part of the inner surface of the dispenser
• It has a very narrow compressible central opening (4- B) for penetration by the syringe plain tip. e- The cap (5) that closes the screw after using and is composed of :
• Outer circular serrated part (5 -A) for handling
• Inner threaded (5-B) part to co apt with the upper threaded part of the shanz screw
) - Drainage system (Fig.5-7):
a- Drainage screw (6) : which is a long cannulated (6-A) schanz screw arranged in composition from above downwards as follows:
• The upper projecting opening of the cannulation (6- B) to stop the head of the valve (7-A) and has inner threads (6-D) for ths connection (9-C) and upper outer threads (6-C) for the innner threads of the cap (8-B).
• The neck (6-E) of the drainage screw is circular short part and gives enough space for easy closure of the cap (8).
• The nut part (6-F) is hexagonal in shape to fit with the wrench for easy installation of the screw or removal.
• The stem of the screw (6-G) is circular in shape for easy fixation to external fixator if needed
• The lower threaded part of the screw is threaded up to the tapering end (6-K). This threaded part is divided into three thirds. The upper third (6-H) is cannulated and fits in the near cortical bone. The middle third is cannulated and has a fusiform hole (6-1) and all this part is medullary where the inner cannulation of the screw ended at lower end of this part. The lower threaded part (6- J) is solid and ended by the conical tapering end of the screw to fit in the far cortex,
b- The valve (7) which is composed of:
• Serrated circular head (7-A) that acts as a handle for easy handling.
• A tail (7-B) that fills the cavity of the cannlation (6- A).
c- The cap (8) closes tile screw after using and is composed of:
• Outer circular serrated part (8-A) for handling
• Inner threaded part (8-B) to co apt with the upper outer threaded part of the screw (6-C)
d- The connection (9) which formed of two endings (9-A) & (9-C) connected by a tube (9-E). The larger end is to fit upper inner threads of the screw (6-D) and it is composed of upper outer small threads (9-C), neck (9- D) and a circular serrated bulb (9-B) for handling. The other end (9-A) to fit with a suction device.

Claims

Claims
1. The Cannulated Fenestrated valved Screws comprising: A long cylindrical cannulated screws having an injection and drainage systems, both said screws could be used for injection or suction drainage. The said injection system composed of injection screws, the dispenser, inner rubber seal, outer rubber plug and the cap. The injection screw is long cylindrical cannulated screw characterized by having threaded upper part to co apt with the cap. At the inner surface of the said screw opposite the external upper threaded part there is beveling of a short distance taking the shape of two arches and a connecting straight line in between having two square pits and acts as an incubator for the inner rubber seal. The outer layer of the said rubber seal characterized by having two square projections and is longer than the inner layer. Each arch of the said rubber seal with its adjacent one of the beveling forms a dome that occupied by dome of the dispenser. The neck of said screw is short circular part separate the upper threaded part from the nut part which is hexagonal in shape to fit with the wrench. The stem of the screw is circular in shape to be easy fixed to an external fixator if needed. The lower threaded part of the screw that is threaded up to its tapering end. This threaded part is divided into three thirds. The upper third is cannulated. The middle third is cannulated and fenestrated. The upper fenestration is oval in shape at the beginning of this middle third at 12 O'clock, the second oval fenestration at 4 O'clock and it lies at the middle of the middle threaded part. The last oval fenestration lies at the end of the middle threaded part at 8 O'clock where the inner cannulation of the screw ended below that point. The lower threaded part is solid and ended by the conical tapering end. The dispenser is long cannulated object arranged in composition from above downwards by the shoulder which is circular part at the orifice of the cannulation to host the shoulder of the outer rubber plug. Below that shoulder there is a short neck followed by a circular dome shaped protrusion that fits in the beveling of the inner part of the schanz screw. Below the said circular dome the stem begins until the oval fenestrations. The fenestration zone is opposing that of the injection screw at 12, 4 and 8 o'clock respectively. The fenestrations are oval also but are characterized by having protrusions at the upper part of every oval fenestration and perpendicular to the long axis of the dispenser. The length of those protrusions as that of threads of the lower threaded part of the screw. When the dispenser dragged outwards out of the screw the system is opened and the oval fenestrations of dispenser and that of the screw are continuous with the cannulated cores of each. So we can inject a medication. When the dispenser is pushed inwards against the said screw the dispenser protrusions walked across the oval fenestrations of the screw and close the openings. The inner rubber seal is circular rubber valve is composed in cut section of external longer limb having two square protrusions and internal shorter limb connected by two arches from both sides and this part occupies the distance between beveling of the screw and the upper inner part of dispenser. The two square protrusions occupy the two square pits of the beveling of the screw. The outer rubber plug is composed of a circular shoulder that rests on the shoulder upper end of the dispenser, tail fills the upper part of the inner surface of the dispenser and it has a very narrow compressible central opening for penetration by the syringe plain tip. The cap is composed of an outer circular serrated part for handling. Inner threaded part to co apt with the upper threaded part of the screw. Drainage system composed of drainage screw which is a long cannulated screw arranged in composition from above downwards by the upper projecting opening of the cannulation to stop the head of the valve and has inner threads for the connection and upper outer threads for the inner threads of the cap. The neck of the drainage screw is a circular short part and gives enough space for easy closure of the cap. The nut part is hexagonal in shape to fit with the wrench. The stem of the screw is circular in shape for easy fixation to external fixator if needed. The lower threaded part of the screw is threaded up to the tapering end. This threaded part is divided into three thirds. The upper third is cannulated. The middle third is cannulated and has a fusiform hole where the inner cannulation of the screw ended at lower end of this part. The lower threaded part is solid and ended by the conical tapering end of the screw. The valve is composed of serrated circular head that acts as a handle and a tail that fills the cavity of the cannlation. The cap closes the screw after using and is composed of an outer circular serrated part (8-A) for handling and an inner threaded part to co apt with the upper outer threaded part of the screw. The connection is formed of two endings connected by a tube. The larger end is to fit upper inner threads "of the screw and it is composed of upper outer small threads, neck and a circular serrated bulb (9-B) for handling. The other end to fit with a suction device.
2. The Cannulated Fenestrated Valved Screws according to claim 1, wherein said the injection system composed of the injection screws, the dispenser, the inner rubber seal, the outer rubber seal and the cap.
3. The Cannulated Fenestrated Valved Screws according to claim 1, wherein said the injection screw starts by an opening of the cannulation at the upper part of the screw.
4. The Cannulated Fenestrated Valved Screws according to claim 1, wherein said screw at its upper outer surface there is upper threaded part
5. The Cannulated Fenestrated Valved Screws according to claim 1, wherein said opposite to the upper threaded part there is inner beveling composed of two arches and connecting straight line having two square protrusions
6. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said below that upper threaded part there is a short cylindrical neck of the said screw
7. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said the neck ended by the nut hexagonal part of the said screw
8. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said below the nut part there is a cylindrical stem of said screw.
9. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said below the stem there is lower threaded part of the said screw which is divided into three equal thirds and this part is of many lengths.
10. The Cannulated Fenestrated Valved Screws according to claim 1, wherein said the upper third of the lower threaded part is cannulated.
11. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said the middle third of the lower threaded part is cannulated; the cannulation of that part is continuous with the exterior by three oval fenestrations with equal length to each other; the upper one at 12 o'clock, the middle one at 4 o'clock and the lower one at 8 o'clock; externally the said part is threaded except the sites of fenestrations a¾d internally the cannulation of the said part ended at a level below the lower fenestration.
12. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said the lower threaded third is solid and ended by the conical tapering part of the said screw.
13. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said the dispenser is cannulated cylindrical long object and occupies the cannulation of the said screw
14. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said the upper orifice of the cannulated dispenser has a circular shoulder
15. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said the said shoulder of the dispenser to hosts the circular shoulder of the outer rubber plug
16. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said the circular shoulder of the said rubber plug is fenestrated centrally by very minute compressed fenestration and has a tail occupies the upper inner part of the dispenser
17. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said below neck of said dispenser there in dome shaped circular protrusion
18. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said dome shaped circular protrusion is encircled by inner rubber seal partly and the other part by the arched beveling of the said screw.
19. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said the inner rubber seal has two arches, outer longer layer having two square protrusions and shorter inner layer
20. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said below the dome shaped protrusion of the dispenser there is the stem
21. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said below the stem there is the fenestration zone of the dispenser that have three oval fenestrations at 12, 4 and 8 o'clock respectively from above downwards
22. The Cannulated Fenestrated Valved Screws according to claim 1, wherein said at upper part of each oval fenestration there is a projecting rod perpendicular to the long axis of the dispenser. The length of those protrusions as that of the same length of the said lower threads of the screw
23. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said if the dispenser pulled of the said screw the system is opened and the oval fenestrations of dispenser and that of the screw are continuous with both cannulated cores and vice versa.
24. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said the cap has an outer circular serrated part and an inner threaded part
25. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said the drainage system having a drainage screw, valve, cap and a connection
26. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said the drainage screw is long cylindrical cannulated object
27. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said drainage screw has an projecting rounded opening at its upper part
28. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said opposite to the said projecting opening there is an internal threaded part and externally there in an external upper threaded part
29. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said the neck of the drainage screw is a circular short part ended by the nut hexagonal part
30. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said below the nut part there is the stem that ended by the lower threaded part
31. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said lower threaded part is divided into three thirds. The upper third is cannulated. The middle third is cannulated and has a fusiform hole where the inner cannulation of the screw ended at lower end of this part. The lower threaded part is solid and ended by the conical tapering end of the said screw.
32. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said the valve having a serrated rounded head for handling. Below the head there is the tail which is long polished circular object that fills the cannulated part of the said screw.
33. The Cannulated Fenestrated Valved Screws according to claim 1, wherein said the cap is cylindrical having an outer serrations and an inner threads.
34. The Cannulated Fenestrated Valved Screws according to claim 1, Wherein said the external connection is formed of two endings connected by a tube. The larger end is to fit upper inner threaded part of the screw and it is composed of upper small, threads, neck and a circular serrated bulb for handling. The other end to fit with a suction device.
PCT/EG2018/000018 2017-10-15 2018-10-10 The cannulated fenestrated valved screws WO2019072355A1 (en)

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US20230190339A1 (en) * 2021-12-20 2023-06-22 Rinaldo Giancola Device for the selective biological synthesis of a bone tissue

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US20050015059A1 (en) * 2003-07-15 2005-01-20 Spinal Generations Method and device for delivering medicine to bone
WO2012106476A2 (en) * 2011-02-03 2012-08-09 Alphatec Spine, Inc. Material delivery apparatus for a bone screw
US20170027628A1 (en) * 2015-07-28 2017-02-02 University-Industry Cooperation Group Of Kyung Hee University Drug delivery implant implanted into bone

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Publication number Priority date Publication date Assignee Title
US20050015059A1 (en) * 2003-07-15 2005-01-20 Spinal Generations Method and device for delivering medicine to bone
WO2012106476A2 (en) * 2011-02-03 2012-08-09 Alphatec Spine, Inc. Material delivery apparatus for a bone screw
US20170027628A1 (en) * 2015-07-28 2017-02-02 University-Industry Cooperation Group Of Kyung Hee University Drug delivery implant implanted into bone

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230190339A1 (en) * 2021-12-20 2023-06-22 Rinaldo Giancola Device for the selective biological synthesis of a bone tissue

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