 Bone Cement Mixing and Delivery System |
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Features and benefits
- Unique mechanical mixing mechanism
Produces reproducibly high quality mixes of cement, reducing dependency on operator skill.
- Operating vacuum level of 550mmHg
Allows cement to be mixed at optimal levels of porosity to maximise the fatigue resistance of the cement.
- Closed system using charcoal / microbiological filter
Reduces MMA fumes in theatre to levels significantly below those set out in the HSE guidelines.
- Few components / simple to use design
Easy to use system.
- High clarity material
Allows the mixing process to be viewed from any position.
- Combination Hip Pack option
HiVac™ Syringe for the femur and HiVac™ Bowl for the acetabulum in one convenient pack.
- Paddle cleaner, deforming piston and contoured plunger
Minimal cement wastage.
- Latex free product
Provides protection against potential latex allergy for nursing staff and patients.
- PVC Free packaging
Helps minimise environmental pollution.
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| Research suggests that the quality of the cement mix is critical in achieving long term joint survival |
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"75% of revisions are caused by aseptic loosening" [1]
"Mechanical failure of the cement mantle is the most common cause of asceptic loosening" [2]
The cement must be able to withstand the high and complex loading that it is subjected to throughout the lifetime of the implant.
During walking the hip joint force exceeds 4 times body weight and this is applied cyclically [3].
Patients with hip/knee replacements take on average 5000 steps per day [4] and these conditions can lead to fatigue failure of the cement mantle [5] and [6].Therefore fatigue resistance of the cement should be optimised to prevent fatigue failure.
Figure 1 shows that the HiVac™ Syringe produces cement with higher fatigue life properties and also less variability when compared to other commercially available systems.
To further enhance fatigue life cement needs to be mixed under optimal vacuum levels. If the vacuum level is too low then the cement will contain high levels of porosity, but if too high, excessive thermal shrinkage can create cracking in the cement mantle. The HiVac™ range operates at 550mmHg, which has been proven to provide an optimal balance between the two. Figure
2
Exposure to Methylmethacrylate (MMA) fumes is a concern of many that work in the vicinity of bone cement mixing. Health and Safety Executive (HSE) recommend a maximum exposure for these fumes of 100ppm during a 15 minute period [7].The HiVac™ range use charcoal filters that reduce fumes down to levels that are only a small fraction of these guideline limits. Figure
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| click on an image for a larger version |
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- Malchau H, Herberts P, Soderman P and Oden A, 2000. Update from the Swedish National Hip Athroplasty Registry 1979-1998. Scientific exhibit AAOS, March 15-19, Orlando, Florida, USA.
- James SP, Jasty M, Davies J, Piehler H and Harris WH, 1992. A fractographic investigation of MMA bone cement focusing on the relationship between porosity reduction and increased fatigue life. J Biomedical Materials Res, 26, 651-662
- Paul, 1976. Approaches to design; Force actions transmitted by joints in the human body. Proc R Soc Lond B, 192, 163-172
- Schmalzried TP, Szuszczewicz ES, Northfield MS, Akizuki KH, Belcher G and Amstutz HC, 1998. Quantitive assessment of walking activity after total hip or knee replacement. J Bone Surgery, 80A (1), 54-59
- Jasty M, Maloney WJ, and Bragdon CR, 1991. The initiation of failure in cemented femoral components of hip arthoplasties. J Bone & Joint Surgery, 73B, 551-558.
- Topoleski LDT, Ducheyne P and Cuckler JM, 1990. A fractographic analysis of in vivo polymethylmethacrylate bone cement failure mechanisms. J Biomed Materials Res, 24, 145-154
- Cary R, Morris L, Cocker J, Groves J and Ogunbiyi A, 1995. Methylmethacrylate: Criteria Document for an occupational exposure limit. Health and Safety Executive
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UK and Export
For further information and details of availability of these products by country please contact:
info@summit-medical.co.uk |
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| Effective, Progressive, Innovative |
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