 MultiMix
Bone Cement Mixing and Delivery System
(Mixes up to 3 x 40g of low
viscosity cement) |
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Features and benefits
- Unique geared rotational axis mixing mechanism
The primary paddle produces a reproducibly high quality mix of cement
- Contra-rotating paddle
The secondary paddle counter rotates in relation to the
primary mixing paddle, scraping the side of the bowl
and feeding cement back into the path of the primary
mixing paddle. This produces reproducibly high quality
mixes of low viscosity cement reducing dependency on
operator skill.
- Unique cement transfer gate
• Unique cement transfer gate
Allows simple, safe and clean transfer of cement from the
mixing chamber to the delivery syringe
- Large capacity mixing chamber
A single, double or triple mix of low viscosity cement can
be mixed and delivered
- Narrow delivery syringe & efficient ratchet delivery gun
Allows for greater “feel” on delivery and the opportunity to generate high cement pressure during pressurisation
- Operating vacuum level of 550mmHg
Allows cement to be mixed at optimal levels of porosity
to maximise the mechanical properties of the cement
– see fig 1, 2 & 3 below. Equalised vacuum between
mixing chamber and delivery syringe allowing smooth
cement transfer and minimal air inclusion.
- 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
- Latex free product
Provides protection against potential latex allergy for
nursing staff and patients - PVC Free packaging
Helps minimise environmental
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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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Bone cement must be able to withstand the high and complex
loading that it is subjected to through the lifetime of the implant.
"75% of revisions are caused by aseptic loosening" [1] and
"mechanical failure of the cement mantle is the most common cause
of aseptic loosening" [2]
During walking 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 mechanical failure of the
cement mantle [5] and [6]. Therefore the mechanical properties of
the cement should be optimised to prevent failure.
Figure 1
shows that the HiVac™ MultiMix produces cement with
enhanced Compressive and Bending strength compared to other
commercially available systems. In addition
Figure 2
shows that
bending modulus is also enhanced with the MultiMix product.
To further enhance the mechanical properties of the cement it
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.
Exposure to MMA fumes is a concern of many that work in the
vicinity of bone cement mixing. HSE recommend a maximum
exposure for these fumes of 100ppm during a 15 minute exposure.
The HiVac™ range uses charcoal filters that reduce fume exposure
down to levels that are only a small fraction of these guideline limits.
Figure 4. |
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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, Piehier H and Harris WH, 1992. A fractographic
investigation of MMA bone cement focussing on the relationship between
porosity reduction and increased fatigue life. J Biomechanical 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 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 polymethlmethacrylate bone cement failure mechanisms. J Biomed
Materials Res, 24, 145-154
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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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