Quantification of the osmotic expansion in implants filled with polyethylene glycol

Daniel A. Hatef, Rohit K. Khosla, Spencer A. Brown, Rod J. Rohrich

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

High reoperation rates continue to agonize the field of breast augmentation surgery. Patient dissatisfaction is a contributing factor for reoperations. This is often attributable to patients' desire to be larger after the augmentation. Polyethylene glycol (PEG) is a potential alternative breast implant filler under investigation. It has been shown to swell secondary to osmotic expansion when it is placed in vivo. We hypothesize that there is a finite expansion in this process. An experimental study was designed utilizing an in vitro model to quantify the rate and volume of the osmotic expansion of PEG-filled implants.Seventeen silicone elastomer shells were filled with various percent concentration and molecular weight PEG/saline solutions. These implants were kept in saline baths at varying temperatures to assess the effect of temperature on osmotic expansion. Daily weights were recorded to quantify the expansion and determine if a plateau was reached.Implant expansion was observed to plateau in all groups tested. Implants filled with 85% concentration PEG solutions demonstrated a uniform expansion at a rate of 0.032 to 0.037 g/d. Implants filled with 85% concentration PEG stored at human core temperature (37°C) gained on average 6.2% to 7.6% of their original weight. Implants stored at 4°C expanded to a higher volume than implants stored at 37°C (P < 0.01). Implants filled with 50% concentration PEG solution gained only 2.7% of their original weight (P < 0.01).PEG-filled implants undergo controlled osmotic expansion to a final predictable weight in vitro. Higher concentration PEG induces greater volume expansion. A colder environment also induces greater volume expansion. PEG is biologically inert and may be an alternative filler for breast implants. The predictable expansion process may be beneficial in breast augmentation that may alleviate patient dissatisfaction about breast size once postoperative edema resolves.

Original languageEnglish (US)
Pages (from-to)468-471
Number of pages4
JournalAnnals of Plastic Surgery
Volume61
Issue number4
DOIs
StatePublished - Oct 2008

Fingerprint

Breast Implants
Weights and Measures
Breast
Reoperation
Temperature
Silicone Elastomers
Baths
Sodium Chloride
Edema
Molecular Weight
In Vitro Techniques

Keywords

  • Breast augmentation
  • Breast implants
  • Implant fillers
  • Implant technology
  • Osmotic expansion
  • Polyethylene glycol implant filler

ASJC Scopus subject areas

  • Surgery

Cite this

Quantification of the osmotic expansion in implants filled with polyethylene glycol. / Hatef, Daniel A.; Khosla, Rohit K.; Brown, Spencer A.; Rohrich, Rod J.

In: Annals of Plastic Surgery, Vol. 61, No. 4, 10.2008, p. 468-471.

Research output: Contribution to journalArticle

Hatef, Daniel A. ; Khosla, Rohit K. ; Brown, Spencer A. ; Rohrich, Rod J. / Quantification of the osmotic expansion in implants filled with polyethylene glycol. In: Annals of Plastic Surgery. 2008 ; Vol. 61, No. 4. pp. 468-471.
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