The Experts below are selected from a list of 135 Experts worldwide ranked by ideXlab platform
J Villagrana - One of the best experts on this subject based on the ideXlab platform.
-
an augmented reality based simulation of Obstetric Forceps delivery
International Symposium on Mixed and Augmented Reality, 2004Co-Authors: R J Lapeer, Minsi Chen, J VillagranaAbstract:During the process of human childbirth, Obstetric Forceps delivery is a justified alternative to Caesarean section when vaginal delivery proves difficult or impossible. Currently, training of Forceps interventions is done on a real case due to the lack of realistic dummy models. This paper presents a basic augmented reality implementation of a Forceps delivery which provides a platform for both training of Forceps placement and manipulation for junior Obstetricians as well as the assessment of any mechanical effects these actions may have on the fetus, and the fetal head and skull in particular.
-
simulating Obstetric Forceps delivery in an augmented environment
2004Co-Authors: R J Lapeer, Minsi Chen, J VillagranaAbstract:During the process of human childbirth, Obstetric Forceps delivery is a justified alternative to Caesarean section when normal vaginal delivery proves difficult or impossible. Currently, training of Forceps interventions is done directly on patients due to the lack of realistic training facilities. The research presented in this paper demonstrates a first implementation of an Obstetric Forceps simulation in an augmented environment. Currently, the simulation allows an Obstetrician to manipulate a real Forceps whilst rotating and extracting a virtual fetus from the birth canal. Deformations of the baby`s skull, as a result of the Forceps manipulation, are then calculated, hence providing diagnostic information of the intervention. Further development of the simulation includes haptic feedback to turn it into a useful training tool for junior Obstetricians and other medical professionals.
R J Lapeer - One of the best experts on this subject based on the ideXlab platform.
-
a computer based simulation of Obstetric Forceps placement
Medical Image Computing and Computer-Assisted Intervention, 2014Co-Authors: R J Lapeer, Vilius Audinis, Zelimkhan Gerikhanov, O DupuisAbstract:Obstetric Forceps are commonly used when the expulsion of the baby during childbirth fails to progress. When the two Forceps blades are applied correctly, i.e. symmetrically, the inner surface of each blade maximises the area in contact with the fetal head. On the contrary, when the blades are applied asymmetrically, the contact areas between the inner surface of the blades and the fetal head are minimal and at distinct locations at the left and right sides of the fetal head. It is therefore assumed in the field of Obstetrics that asymmetric application is bound to cause intra-cranial damage due to significantly higher shear forces and significant deformation of the fetal cranial bones as compared to symmetric application. In this paper we present the first of a series of studies to analyse the mechanical contact between head and Forceps under different conditions using finite element analysis. We used high fidelity mesh models of a fetal skull and Obstetric Forceps. The fetal cranial material properties are known from previous studies. We observed significantly higher deformations and stresses for the asymmetric application of the blades as compared to symmetric placement.
-
a mechanical contact model for the simulation of Obstetric Forceps delivery in a virtual augmented environment
Studies in health technology and informatics, 2005Co-Authors: R J LapeerAbstract:During the process of human childbirth, Obstetric Forceps delivery can be a justified alternative to emergency Caesarean section when normal vaginal delivery proves difficult or impossible. Currently, training of Forceps interventions is mainly done on real patients which poses a risk. This paper describes a pilot project on the simulation of training of Obstetric Forceps delivery, using Virtual Reality technology. We first give a brief historical review of the concept of 'birth simulation' and describe the current implementation of the interface. Then we report a number of experiments, conducted to test the feasibility of a real-time mechanical contact model to describe the interaction between the Forceps and fetal head, eventually to be interfaced with a multi-purpose haptic feedback device. It is concluded that an explicit dynamic model to calculate the deformation of the main fetal skull bones only, or a quasi-static model to calculate the deformation of the fetal head in its entirety, can reach real-time performance.
-
an augmented reality based simulation of Obstetric Forceps delivery
International Symposium on Mixed and Augmented Reality, 2004Co-Authors: R J Lapeer, Minsi Chen, J VillagranaAbstract:During the process of human childbirth, Obstetric Forceps delivery is a justified alternative to Caesarean section when vaginal delivery proves difficult or impossible. Currently, training of Forceps interventions is done on a real case due to the lack of realistic dummy models. This paper presents a basic augmented reality implementation of a Forceps delivery which provides a platform for both training of Forceps placement and manipulation for junior Obstetricians as well as the assessment of any mechanical effects these actions may have on the fetus, and the fetal head and skull in particular.
-
simulating Obstetric Forceps delivery in an augmented environment
2004Co-Authors: R J Lapeer, Minsi Chen, J VillagranaAbstract:During the process of human childbirth, Obstetric Forceps delivery is a justified alternative to Caesarean section when normal vaginal delivery proves difficult or impossible. Currently, training of Forceps interventions is done directly on patients due to the lack of realistic training facilities. The research presented in this paper demonstrates a first implementation of an Obstetric Forceps simulation in an augmented environment. Currently, the simulation allows an Obstetrician to manipulate a real Forceps whilst rotating and extracting a virtual fetus from the birth canal. Deformations of the baby`s skull, as a result of the Forceps manipulation, are then calculated, hence providing diagnostic information of the intervention. Further development of the simulation includes haptic feedback to turn it into a useful training tool for junior Obstetricians and other medical professionals.
John C Morrison - One of the best experts on this subject based on the ideXlab platform.
-
a randomized prospective trial of the Obstetric Forceps versus the m cup vacuum extractor
American Journal of Obstetrics and Gynecology, 1996Co-Authors: James A Bofill, Orion A Rust, Stephen J Schorr, Robert C Brown, Rick W Martin, James N Martin, John C MorrisonAbstract:Abstract OBJECTIVE: Our purpose was to determine the efficacy of the Obstetric Forceps versus the M-cup, a new vacuum extractor cup, and maternal-neonatal complication rates. STUDY DESIGN: Over a 10-month period operative vaginal deliveries were randomized between the Obstetric Forceps and the M-cup vacuum extractor cup. Maternal demographics, indication for intervention, analgesia, position, station, degree of asynclitism, fetal caput-molding, and time from application to delivery were prospectively recorded. Episiotomy and extensions, lacerations, and the reason for abandonment of the randomized instrument were noted in both groups. Fetal weight, Apgar scores, cord arterial gases, hyperbilirubinemia, phototherapy, and any evidence of fetal trauma were documented at delivery or in the nursery. RESULTS: Six hundred thirty-seven women were randomized, 315 in the Forceps group and 322 in the M-cup group. There were no differences in maternal demographic variables. The station, position, degree of asynclitism, or requirement for rotation was not different between the groups. The corrected efficacy rates were Forceps 92% and M-cup 94% ( p = 0.217). The M-cup deliveries were accomplished more rapidly than Forceps deliveries ( p p p p = 0.002) lacerations, but blood loss as clinically estimated ( p = 0.232) or as measured by hemoglobin levels ( p = 0.166) was not significantly different. Forceps deliveries were associated with fewer clinically diagnosed cephalhematomas ( p = 0.015) than M-cup deliveries were, but there were no differences in the number of neonates diagnosed with hyperbilirubinemia ( p = 0.377) or in the number of infants treated with phototherapy ( p = 0.660). CONCLUSIONS: The M-cup vacuum extractor cup appears to be as efficient (and faster) than the Obstetric Forceps but is associated with significantly more fetal cephalhematomas, whereas maternal injuries are more common with the Forceps. (Am J Obstet Gynecol 1996;175:1325-30.)
Glenn Gardener - One of the best experts on this subject based on the ideXlab platform.
-
trial of instrumental delivery in theatre versus immediate caesarean section for anticipated difficult assisted births
Cochrane Database of Systematic Reviews, 2012Co-Authors: Franz Majoko, Glenn GardenerAbstract:Background The majority of women have spontaneous vaginal births, but some women need assistance in the second stage with delivery of the baby, using either the Obstetric Forceps or vacuum extraction. Rates of instrumental vaginal delivery range from 5% to 20% of all births in industrialised countries. The majority of instrumental vaginal deliveries are conducted in the delivery room, but in a small proportion (2% to 5%), a trial of instrumental vaginal delivery is conducted in theatre with preparations made for proceeding to caesarean section. Objectives To determine differences in maternal and neonatal morbidity between women who, due to anticipated difficulty, have trial of instrumental vaginal delivery in theatre and those who have immediate caesarean section for failure to progress in the second stage. Search methods We searched the Cochrane Pregnancy and Childbirth Group's Trials Register (28 June 2012). Selection criteria Randomised controlled trials comparing trial of instrumental vaginal delivery (vacuum extraction or Forceps) in operating theatre to immediate caesarean section for women with failure to progress in the second stage (active second stage more than 60 minutes in primigravidae). Data collection and analysis We identified no studies meeting our inclusion criteria. Main results No studies were included. Authors' conclusions There is no current evidence from randomised trials to influence practice.
James A Bofill - One of the best experts on this subject based on the ideXlab platform.
-
a randomized prospective trial of the Obstetric Forceps versus the m cup vacuum extractor
American Journal of Obstetrics and Gynecology, 1996Co-Authors: James A Bofill, Orion A Rust, Stephen J Schorr, Robert C Brown, Rick W Martin, James N Martin, John C MorrisonAbstract:Abstract OBJECTIVE: Our purpose was to determine the efficacy of the Obstetric Forceps versus the M-cup, a new vacuum extractor cup, and maternal-neonatal complication rates. STUDY DESIGN: Over a 10-month period operative vaginal deliveries were randomized between the Obstetric Forceps and the M-cup vacuum extractor cup. Maternal demographics, indication for intervention, analgesia, position, station, degree of asynclitism, fetal caput-molding, and time from application to delivery were prospectively recorded. Episiotomy and extensions, lacerations, and the reason for abandonment of the randomized instrument were noted in both groups. Fetal weight, Apgar scores, cord arterial gases, hyperbilirubinemia, phototherapy, and any evidence of fetal trauma were documented at delivery or in the nursery. RESULTS: Six hundred thirty-seven women were randomized, 315 in the Forceps group and 322 in the M-cup group. There were no differences in maternal demographic variables. The station, position, degree of asynclitism, or requirement for rotation was not different between the groups. The corrected efficacy rates were Forceps 92% and M-cup 94% ( p = 0.217). The M-cup deliveries were accomplished more rapidly than Forceps deliveries ( p p p p = 0.002) lacerations, but blood loss as clinically estimated ( p = 0.232) or as measured by hemoglobin levels ( p = 0.166) was not significantly different. Forceps deliveries were associated with fewer clinically diagnosed cephalhematomas ( p = 0.015) than M-cup deliveries were, but there were no differences in the number of neonates diagnosed with hyperbilirubinemia ( p = 0.377) or in the number of infants treated with phototherapy ( p = 0.660). CONCLUSIONS: The M-cup vacuum extractor cup appears to be as efficient (and faster) than the Obstetric Forceps but is associated with significantly more fetal cephalhematomas, whereas maternal injuries are more common with the Forceps. (Am J Obstet Gynecol 1996;175:1325-30.)
