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8/2/2019 G15-Bone Cement Injector
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Prof. B. Ravi, I.I.T. Bombay
Ashik Kumar Patel
Prateek Malviya
Amandeep Singh Ahuja
Mech. Engg., I.I.T. Bombay
Bone Cement Injector
Collaborative Engineering
Rendered Image of Device
Mentor : Rupesh Ghyar
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Problem Definition
Todesign a system for preparation and controlled
injection of homogeneous low porosity bone cement
mixture for femoral prosthesis implant
Photo to illustrate the problem
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Prof. B. Ravi, I.I.T. Bombay
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Osteosarcoma
Most common type of bone cancer
Sixth most common type of cancer in children
Most cases of osteosarcoma involve the knee
400 children under age 20
Approximately 1/3 die each year
Need?
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Bone Cement for Dental Implant
Dr Otto Rohm
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Sir John Charnley
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Prof. B. Ravi, I.I.T. Bombay
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Why Reduce Porosity?
Microscopic Pores
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500 550 mm Hg reduces
porosity to
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Vacuum Pump and Regulator
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Existing Concept
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Prof. B. Ravi, I.I.T. BombayFunctional Requirements
Homogeneous and low porosity cement mixture
Variable size nozzles
Light weight
Easy to use by an average-skilled surgeon
Bio compatible (Class I)
Economical (< Rs 30,000 , less than imported gun)
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Prof. B. Ravi, I.I.T. BombayProduct Concept
Simple labelled figure
of product concept
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Prof. B. Ravi, I.I.T. BombayProduct Mechanism
3D CAD Animation
of product concept
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Prof. B. Ravi, I.I.T. BombaySafety & Reliability
Silicone seal to maintain the required level of vacuum
Bio compatible materials
FEA or Failure mode analysis
and point out features that were modified
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Prof. B. Ravi, I.I.T. BombayMaterial and Process Selection
Syringe : Polypropylene
Seal : Silicone with medical coating
Gun : stainless steel body with SS springs
Nozzles : Polypropylene
Figure to point out materials and
manufacturing process for each component
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Prof. B. Ravi, I.I.T. BombayDesign for Manufacturability
List design modifications to improve quality and reduce cost
Elimination of a separate pump or high pressure air
connection
Compatible with nozzles of different sizes
Low cost disposable mixing blades
Figure to point out DFM changes
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Prof. B. Ravi, I.I.T. BombayPatent Claims
The device enables mixing and injection to be carried out
without having to replace the syringe
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Low porosity cement mixture
Convenient to use:
same syringe for mixing and injection
ease of assembly
Utilises the existing vacuum connection in hospitals
no need of a high pressure air connection or a pump
reduction in cost
SUMMARY