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Single-use cataract surgery comes with several safety and quality attributes.
Special to Ophthalmology Times®
During the past 5 years, I have developed an all single-use instrument cataract surgery (ASUICS) custom pack.
The surgical instruments contained in the pack are the only ones used to prepare the surgery tray. I regularly use it for cataracts up to Lens Opacities Classification System III grade 4.1
Before discussing the contents of this custom pack, let us consider the possible advantages of single-use instruments in cataract surgery. Such discussions are usually based on 3 factors: risk, cost, and the waste materials produced.
Cleaning any instrument that has a cannular structure, even when the manufacturer’s instructions are thoroughly followed, has the potential to leave microscopic remains lodged inside that could pose a genuine threat to patients or at least worsen outcomes.
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In Germany, the Commission on Hospital Hygiene and Infection Protection at the Robert Koch Institute and the Federal Institute for Drugs and Medical Devices suggest mechanical cleaning of reusable instruments or surgical equipment prior to sterilization.2
The small inner lumen diameter of phacoemulsification and irrigation/aspiration handpieces does not permit mechanical cleaning with a brush, so compressed air or flushing with water or solvents is required.
However, this is far less thorough than a brush.
FDA guidelines recognize that instruments with lumens that are not freely accessible (ie, they have sharp angles or are too small to permit access with a brush) may pose a challenge to adequate reprocessing.3
Using only single-use instruments abolishes the potential risk of infection transmission.4
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Prophylactic intracameral antibiotics may seem a simple solution to the issue, but they have a significant drawback in that they contribute to emerging antimicrobial resistance.5
Other drawbacks include, but are not limited to, inefficacy due to dilution, contamination during preparation, toxic anterior segment syndrome, corneal endothelial toxicity, hemorrhagic occlusive retinal vasculitis, and toxic effects on the retina.6
Although disposable instruments are generally considered more expensive, reusable instruments have hidden costs including those incurred from reprocessing, maintaining an autoclave facility, cleaning microbicides and instruments for disinfection, packaging, and human resources.
In addition, there are unexpected expenses such as accidental damage/repair, maintenance, and the need to update them to keep pace with technological breakthroughs.
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Another factor to consider is that investment in nonsingle-use instruments may have limited the advancement of techniques.
For example, reducing the caliber of an instrument may make it no longer practical to clean and reuse for a sufficient number of times.
Thus, reducing the diameter may effectively mean that all instruments are usable only a very limited number of times.
The custom ASUICS pack includes a nanolaser handpiece, a microscope handle cover, a phacoemulsification cassette, an eyelid retractor, scissors, a side-port blade, a syringe with physiological solution, a syringe, a hydrodissection cannula, a cystotome holder, 2 ophthalmic viscosurgical devices, a 2-sided modified Neuhann chopper, a prebent cystotome, separate irrigation and aspiration devices, and surgical drapes (Figure 1, seen at top of page).
The scissors and chopper are made of titanium and could in principle be reused, but when we finish each procedure everything is thrown away.
Weighing pros and cons
Now that an ASUICS pack is available, surgeons should evaluate whether this option is right for them and, above all, the best choice for their patients. I decided in favor of single-use instruments several years ago, having evaluated the pros and cons of reusable vs single use
(See Figure 2 for a pro-con weighted comparison of the 2 options).
The key pros for single use include the ability to rapidly integrate updated technology without having to take a loss for outdated purchased instruments; the elimination of the risk of passing organic material from patient to patient—especially probable when having to clean a tubular instrument; the elimination of sterilization costs; and, specific to nanolaser photofragmentation, the reduced loss of endothelial cells postoperatively.7,8
Some of the cons that must be considered include the increased cost per procedure and the increase in waste products, including packaging and instruments.
I concluded that the balance was more than tipped toward a single-use solution. I also discovered that this decision was reinforced by the rapid evolution of handpieces, which has increased the holding potential and the cataract grade that can be successfully treated without an increase in cost.
This technique still has a significant margin for future developments.
This decision also allows me to offer patients procedures for both eyes on the same day.
After the first procedure is completed, the patient is moved to another operating room where a new ASUICS pack is used for the procedure on the second eye.
I have found that this option is becoming more popular with younger, active patients who must travel to my center. I also believe that the shorter recovery time that is required with a nanolaser procedure favors this option.
Although biomedical waste is an important consideration when making this decision, I believe the most pressing factors in deciding between recycling instruments or using a single-use pack should be the risk/spread of infection and the quality of the outcome.
Delaying the implementation of new technology to complete the work cycle of a reusable instrument should not be accepted under any circumstances.
About the author
Gangolf Sauder, MD
Sauder has been the managing director and chief physician of the Charlottenklinik für Augenheilkunde in Stuttgart, Germany, and a professor in the Department of Ophthalmology of the University of Mannheim since 2006. He has no financial interests in any of the products mentioned.
1. Sauder G, Ruf E, Moedl S, Thyzel R. Nanosecond laser cataract surgery in LOCS III grade 4 and 5: a case series. Asia Pac J Ophthalmol (Phila). 2017;6(5):425-428. doi:10.22608/APO.2017123
2. Commission for Hospital Hygiene and Infection Prevention (KRINKO); Federal Institute for Drugs and Medical Devices (BfArM). Empfehlung der Kommission für Krankenhaushygiene und Infektionsprävention (KRINKO) beim Robert Koch-Institut (RKI) und des Bundesinstitutes für Arzneimittel und Medizinprodukte (BfArM). Anforderungen an die Hygiene bei der Aufbereitung von Medizinprodukten. Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz. 2012;55(10):1244-1310. doi:10.1007/s00103-012-1548-6
3. FDA. Reprocessing Medical Devices in Health Care Settings: Validation Methods and Labeling. Guidance for Industry and Food and Drug Administration Staff. 2017:1-77.
4. Walker P. Pediatric adenoidectomy under vision using suction-diathermy ablation. Laryngoscope. 2001;111(12):2173-2177. doi:10.1097/00005537-200112000-00019
5. Schwartz SG, Flynn HW Jr, Grzybowski A, Relhan N, Ferris FL 3rd. Intracameral antibiotics and cataract surgery: endophthalmitis rates, costs, and stewardship. Ophthalmology. 2016;123(7):1411-1413. doi:10.1016/j.ophtha.2016.03.024
6. Flynn HW, Batra NR, Schwartz SG, Grzybowski A. Antibiotic stewardship. In: Flynn HW, Batra NR, Schwartz SG, Grzybowski A, eds. Antibiotic Stewardship in Endophthalmitis in Clinical Practice. Springer International Publishing; 2018:171-172.
7. Tanev I, Tanev V, Kanellopoulos AJ. Nanosecond laser-assisted cataract surgery: endothelial cell study. J Cataract Refract Surg. 2016;42(5):725-730. doi:10.1016/j.jcrs.2016.02.039
8. Mastropasqua L, Mattei PA, Toto L, et al. All laser cataract surgery compared to femtosecond laser phacoemulsification surgery: corneal trauma. Int Ophthalmol. 2017;37(3):475-482. doi:10.1007/s10792-016-0283-7