g15-bone cement injector

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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3

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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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

g15-bone cement injector

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