# US 11,432,796 B2 · Positioning support and fetal heart rate registration support for CTG ultrasound transducers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,432,796 B2 - Document ID: US11432796B2 - Status: Granted - Kind: B2 - Application number: 16/094,051 - Filed: 2017-05-05 - Published: 2019-05-09 - Granted: 2022-09-06 - Earliest claimed: 2016-05-12 - Assignees: Koninklijke Philips N.V. - Applicants: Koninklijke Philips N.V. - Inventors: Paul Hamelmann; Lars Schmitt; Alexander Franciscus Kolen; Markus Wohlschlager - Web page: https://patentgrep.com/patent/US11432796B2 ## CPC - A61B 8/0866: {involving foetal diagnosis; pre-natal or peri-natal diagnosis of the baby} - A61B 8/0883: {for diagnosis of the heart} - A61B 8/42: {Details of probe positioning or probe attachment to the patient} - A61B 8/4245: {involving determining the position of the probe, e.g. with respect to an external reference frame or to the patient} - A61B 8/488: {involving Doppler signals} - A61B 8/5269: {involving detection or reduction of artifacts} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A method for monitoring fetal health. The method of the present disclosure comprises transmitting (100) an ultrasound signal from an at least one transducer element in an array towards a maternal abdomen. An at least one ultrasonic echo signal corresponding to an at least one depth of the maternal abdomen is then received (102) by the at least one transducer element. The at least one Doppler signal is determined after the echo is received by the at least one transducer element is then processed (104) in an at least one channel. A multidimensional map is then generated (106) from the processed Doppler signal. A feedback (114) to reposition the at least one transducer element is then provided when the fetal heart is determined to lie outside an ultrasound beam volume. ## Claims ### Claim 1 A method of monitoring fetal health, comprising: transmitting an ultrasound signal from at least one transducer element in an array towards a maternal abdomen to create a measurement volume; receiving by the at least one transducer element at least one ultrasound signal echo corresponding to at least one depth of the maternal abdomen; processing in at least one channel the at least one ultrasound signal echo received by the at least one transducer element to create at least one Doppler signal; generating a multidimensional heat map from the at least one Doppler signal; determining from the multidimensional heat map whether a fetal heart lies outside a central alignment of the measurement volume; providing feedback on how to reposition the at least one transducer element, such that the fetal heart lies within the central alignment of the measurement volume, when the fetal heart is determined to lie outside the central alignment of the measurement volume; and automatically entering a fetal heart rate monitoring mode upon determining that the fetal heart lies within the central alignment of the measurement volume. ### Claim 2 (depends on 1) The method of monitoring fetal health of claim 1, wherein generating the multidimensional heat map from the at least one Doppler signal includes generating a two-dimensional (2D) heat map integrated with a depth heat map. ### Claim 3 (depends on 1) The method of monitoring fetal health of claim 1, further comprising automatically switching from the fetal heart rate monitoring mode to a position support mode when the fetal heart is determined to lie outside the central alignment of the measurement volume. ### Claim 4 (depends on 1) The method of monitoring fetal health of claim 1, wherein generating the multidimensional heat map from the pat least one Doppler signal includes generating a two-dimensional (2D) map and a depth heat map, and presenting both the 2D heat map and the depth heat map on a user device. ### Claim 5 (depends on 4) The method of monitoring fetal health of claim 4, further comprising highlighting a portion of the depth heat map corresponding to a portion of the 2D heat map being displayed. ### Claim 6 (depends on 1) The method of monitoring fetal health of claim 1, wherein generating the multidimensional heat map from the at least one Doppler signal includes generating a three-dimensional (3D) heat map. ### Claim 7 (depends on 6) The method of monitoring fetal health of claim 6, wherein generating the 3D heat map includes measuring a plurality of Doppler signals at a plurality of sample volumes. ### Claim 8 (depends on 7) The method of monitoring fetal health of claim 7, wherein measuring of the plurality of Doppler signals includes using a plurality of range gates. ### Claim 9 (depends on 1) The method of monitoring fetal health of claim 1, further comprising determining a direction towards the fetal heart. ### Claim 10 (depends on 9) The method of monitoring fetal health of claim 9, wherein providing the feedback includes transmitting haptic feedback through an ultrasound device. ### Claim 11 (depends on 9) The method of monitoring fetal health of claim 9, wherein providing the feedback includes providing a directional indication towards the fetal heart based on the determined direction towards the fetal heart. ### Claim 12 (depends on 11) The method of monitoring fetal health of claim 11, wherein providing the feedback includes illuminating an LED on a housing associated with the at least one transducer element. ### Claim 13 (depends on 11) The method of monitoring fetal health of claim 11, wherein providing the feedback includes providing visual feedback of the directional indication on a user device. ### Claim 14 A method of monitoring fetal health, comprising: entering a position support mode of operation for an ultrasound device; transmitting ultrasound signals from at least one transducer of the ultrasound device to create a measurement volume; receiving by the at least one transducer ultrasound signal echoes corresponding to depth in a maternal abdomen; processing by a processor the received ultrasound signal echoes received by the at least one transducer to create at least one Doppler signal; generating a multi-dimensional heat map from the at least one Doppler signal; determining from the multi-dimensional heat map, when a fetal heart is outside a central alignment of the measurement volume; providing feedback on how to reposition the at least one transducer such that the fetal heart lies within the central alignment of the measurement volume when the fetal heart is determined to be outside the central alignment of the measurement volume; and automatically entering a fetal heart rate monitoring mode upon determining that the fetal heart lies within the central alignment of the measurements volume. ### Claim 15 (depends on 14) The method of claim 14, wherein providing the feedback includes presenting information on a user device indicating a direction from a center of the measurement volume. ### Claim 16 (depends on 14) The method of claim 14, further comprising switching the ultrasound device from the fetal heart rate monitoring mode to the position support mode of operation upon detecting when the fetal heart lies outside the central alignment of the measurement volume. ### Claim 17 (depends on 14) The method of claim 14, wherein the multi-dimensional heat map is a combined construct of a two dimensional heat map and a depth heat map. ### Claim 18 (depends on 14) The method of claim 14, wherein providing the feedback includes illuminating at least one light source on the ultrasound device. ### Claim 19 (depends on 18) The method of claim 18, wherein the at least one light source indicates a direction from a center of the measurement volume towards the fetal heart. ### Claim 20 An apparatus for monitoring fetal health, comprising: an ultrasound device having a plurality of transducers; at least one processor; and a non-transitory memory storing instructions which, when executed by the at least one processor, cause the at least one processor to: transmit ultrasound signals from the plurality of transducers of the ultrasound device; receive by the plurality of transducers ultrasound signal echoes corresponding to depth in a maternal abdomen; create Doppler signals based upon the ultrasound signal echoes received by the plurality of transducers; generate a multi-dimensional heat map from the Doppler signals; determine from the multi-dimensional heat map when a fetal heart lies outside a central alignment of a measurement volume; provide directional feedback on how to reposition the ultrasound device such that the fetal heart lies within the central alignment of the measurement volume when the fetal heart is determined to lie outside the central alignment of the measurement volume; and automatically entering a fetal heart monitoring mode upon determining that the fetal heart lies within the central alignment of the measurements volume.