Preoperative Assessment of the Implantable Middle Ear Pump System Using CT Scans and Conventional X-rays of the Temporal Bone

Maassen, Marcus M.; Lehner, R.; Lüdtke, Rainer; Strayle-Batra, Marion; Zenner, Hans‐Peter

doi:10.1177/014556139707600709

Cited by 6 publications

(6 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This finding is to be expected given the large individual variance in the shape of the cavity and is in agreement with the findings of Maassen et al [Maassen et al, 1997]. The shape of the cavity depends on the extent and pattern of aeration of the mastoid bone and these vary greatly among individuals.…”

Section: Discussionsupporting

confidence: 92%

“…These dimensions exclude subjects with temporal bone pathology and chronic otitis media by history or imaging, as the disease process can interfere with normal mastoid development and aeration, resulting in smaller cavities. Maassen et al studied the size of the mastoid cavity of fifty cadaver temporal bones [Maassen et al, 1997]. Based on CT scans, the average size of a virtual cavity was 8.56 cm 3 with standard deviation of 3.59 cm 3 .…”

Section: Discussionmentioning

confidence: 99%

“…In a cadaver temporal bone CT study, Maassen et al reported a sensitivity of 89.7% for predicting successful implantation of a device of their design [Maassen et al, 1997], with a positive predictive value of 100% (successful implantation was correctly anticipated) and 73.3% negative predictive value (the probability of correct negative prediction). These values may vary according to the specific design of the implant.…”

Section: Discussionmentioning

confidence: 99%

“…the mastoid cortex). To-date one set of measurements of the size of the implantable space has been published [Maassen, 1997]. This space varies between individuals in volume, linear dimensions (height, depth etc) and shape.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Mastoid Cavity Dimensions and Shape: Method of Measurement and Virtual Fitting of Implantable Devices

Handzel

Wang²,

Fiering³

et al. 2009

Audiol Neurotol

View full text Add to dashboard Cite

Temporal bone implants can be used to electrically stimulate the auditory nerve, to amplify sound, to deliver drugs to the inner ear and potentially for other future applications. The implants require storage space and access to the middle or inner ears. The most acceptable space is the cavity created by a canal wall up mastoidectomy. Detailed knowledge of the available space for implantation and pathways to access the middle and inner ears is necessary for the design of implants and successful implantation. Based on temporal bone CT scans a method for three-dimensional reconstruction of a virtual canal wall up mastoidectomy space is described. Using Amira® software the area to be removed during such surgery is marked on axial CT slices, and a three-dimensional model of that space is created. The average volume of 31 reconstructed models is 12.6 cm³ with standard deviation of 3.69 cm³, ranging from 7.97 to 23.25 cm³. Critical distances were measured directly from the model and their averages were calculated: height 3.69 cm, depth 2.43 cm, length above the external auditory canal (EAC) 4.45 cm and length posterior to EAC 3.16 cm. These linear measurements did not correlate well with volume measurements. The shape of the models was variable to a significant extent making the prediction of successful implantation for a given design based on linear and volumetric measurement unreliable. Hence, to assure successful implantation, preoperative assessment should include a virtual fitting of an implant into the intended storage space. The above-mentioned three-dimensional models were exported from Amira to a Solidworks application where virtual fitting was performed. Our results are compared to other temporal bone implant virtual fitting studies. Virtual fitting has been suggested for other human applications.

show abstract

Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mastoid Cavity Dimensions and Shape: Method of Measurement and Virtual Fitting of Implantable Devices

Handzel

Wang²,

Fiering³

et al. 2009

Audiol Neurotol

View full text Add to dashboard Cite

show abstract

“…There are other possible types of implants located in the temporal bone, such as a power connector to supply a heart-assisting pump [6] or an implantable inner ear drug delivery system [7,8]. …”

Section: Introductionmentioning

confidence: 99%

A Bone-Thickness Map as a Guide for Bone-Anchored Port Implantation Surgery in the Temporal Bone

et al. 2013

View full text Add to dashboard Cite

The bone-anchored port (BAP) is an investigational implant, which is intended to be fixed on the temporal bone and provide vascular access. There are a number of implants taking advantage of the stability and available room in the temporal bone. These devices range from implantable hearing aids to percutaneous ports. During temporal bone surgery, injuring critical anatomical structures must be avoided. Several methods for computer-assisted temporal bone surgery are reported, which typically add an additional procedure for the patient. We propose a surgical guide in the form of a bone-thickness map displaying anatomical landmarks that can be used for planning of the surgery, and for the intra-operative decision of the implant’s location. The retro-auricular region of the temporal and parietal bone was marked on cone-beam computed tomography scans and tridimensional surfaces displaying the bone thickness were created from this space. We compared this method using a thickness map (n = 10) with conventional surgery without assistance (n = 5) in isolated human anatomical whole head specimens. The use of the thickness map reduced the rate of Dura Mater exposition from 100% to 20% and suppressed sigmoid sinus exposures. The study shows that a bone-thickness map can be used as a low-complexity method to improve patient’s safety during BAP surgery in the temporal bone.

show abstract

A Portable Drug Delivery System with Silicon Capillaries as Key Components

Richter

Lutter

Leukert

et al. 2001

Transducers ’01 Eurosensors XV

View full text Add to dashboard Cite

Preoperative Assessment of the Implantable Middle Ear Pump System Using CT Scans and Conventional X-rays of the Temporal Bone

Cited by 6 publications

References 1 publication

Mastoid Cavity Dimensions and Shape: Method of Measurement and Virtual Fitting of Implantable Devices

Mastoid Cavity Dimensions and Shape: Method of Measurement and Virtual Fitting of Implantable Devices

A Bone-Thickness Map as a Guide for Bone-Anchored Port Implantation Surgery in the Temporal Bone

A Portable Drug Delivery System with Silicon Capillaries as Key Components

Contact Info

Product

Resources

About