15 results about "Cannula tip" patented technology

The invention relates to a cannula having an elongate cannula tube and a distal cannula tip. According to the invention, the cannula tube has a polygonal hollow profile and / or the cannula tip has a retroreflective geometry.

To provide a method and a system for determining the location of a cannula tip in a body, which provide advantages over conventional techniques.SOLUTION: A method for determining the position of a cannula tip within a body, comprising the steps of coupling an ultrasound signal into the body, receiving the ultrasound signal, wherein the ultrasound signal is received by a plurality of sensors, wherein the plurality of sensors are attached to a cannula located within the body and are arranged at a known axial distance to the cannula tip and at a known axial distance to each other along a longitudinal axis of the cannula, comparing the received ultrasound signals, and determining the position of the catheter tip relative to the ultrasound probe, wherein: And wherein the position is determined by the evaluation device depending on a comparison of signal amplitudes and signal waveforms of the received ultrasonic signals.SELECTED DRAWING: Figure 8

The invention relates to a cannula with a longitudinally extended cannula tube and a distal cannula tip. According to the invention, the cannula tube has a polygonal hollow profile and / or the cannula tip has a retroreflective geometry.

The invention relates to a cannula assembly comprising a cannula tube extending longitudinally between a distal cannula end and a proximal cannula end and having a distal cannula tip, a cannula connector arranged at the proximal cannula end, a fluid channel extending longitudinally between the distal cannula end and a proximal cannula connector end, and a pressure sensor configured to detect fluid pressure in the fluid channel. The invention further relates to a medical system for use in regional anesthesia, comprising the cannula assembly.

The present invention relates to a method for determining the position of a cannula tip in a body, comprising the steps of: coupling an ultrasound signal into the body, where the ultrasound signal is coupled into the body using an ultrasound probe resting on the body and along an imaging plane of an ultrasound imaging process, where the imaging plane extends in a depth direction and a transverse direction; receiving an ultrasonic signal, where the ultrasonic signal is received by a plurality of sensors attached to a cannula located in the body and arranged along a longitudinal axis of the cannula at a known axial distance to the tip of the cannula and to each other; comparing the received ultrasonic signals, wherein the received ultrasonic signals are compared with respect to their signal amplitude and signal waveform by means of an evaluation device connected to the sensor; a position of the catheter tip relative to the ultrasound probe is determined, wherein the position is determined by an evaluation device depending on a comparison of a signal amplitude and a signal waveform of the received ultrasound signal. The invention also relates to a medical system for carrying out the method.

An alternative mechanism for forming a cannula assembly having an internal coil does not require a separate tipping process for forming a cannula tip or leaving a length of tubing extending beyond the coil for formation of the tip when forming each catheter. The injection molding process that is used to form the cannula hub on the proximal end of the cannula can be modified to balance the mold flow and runners used in the process to simultaneously mold a tapered tip onto a distal end of the cannula at the same time that the infusion hub is molded.

The invention relates to a method for determining the position of a cannula tip inside a body, comprising the steps of: coupling an ultrasound signal into the body, wherein the ultrasound signal is coupled into the body using an ultrasound transducer placed on the body and along an image plane of an ultrasound imaging method, the image plane extending along a depth direction and a transverse direction; receiving the ultrasound signal, wherein the ultrasound signal is received by several sensors attached to a cannula located in the body and arranged at known axial distances to the cannula tip and to each other along a longitudinal axis of the cannula; comparing the received ultrasound signals, wherein the received ultrasound signals are compared with regard to their signal strengths and their signal profiles by means of an evaluation device connected to the sensors;Determining the position of the catheter tip in relation to the ultrasound probe, wherein the position is determined by comparing the signal strengths and signal profiles of the received ultrasound signals using the evaluation device. The invention also relates to a medical system for carrying out the method.

An alternative mechanism for forming a cannula assembly having an internal coil does not require a separate tipping process for forming a cannula tip or leaving a length of tubing extending beyond the coil for formation of the tip when forming each catheter. The injection molding process that is used to form the cannula hub on the proximal end of the cannula can be modified to balance the mold flow and runners used in the process to simultaneously mold a tapered tip onto a distal end of the cannula at the same time that the infusion hub is molded.

The invention relates to a cannula (4), in particular an infusion cannula (4), for a drug delivery device (32), in particular for an infusion pump (1), and to a drug delivery device (32), in which the cannula (4) comprises a container-side cannula end (6) and a recipient-side cannula end (7), at which a first cannula tip (8) is formed, wherein the cannula (4) comprises, between the container-side cannula end (6) and the recipient-side cannula end (7), a central cannula section (9) and at least one adjacent, in particular adjoining, end-side cannula section, in particular a first end-side cannula section (10) adjacent to the recipient-side cannula end (7) and a second end-side cannula section (11) adjacent to the container-side cannula end (6), the first end-side cannula section (10), in particular the central cannula section (9), is elastically deformable such that the cannula tip (8) can be displaced from a starting position (12) into a piercing position (13) and can be elastically restored when the central cannula section (9) is elastically deformed and the first end-side cannula section (10) is fixed or positionally fixed.

A cannula has an elongate cannula tube and a cannula tip. The cannula tube can have a polygonal hollow profile. The cannula tip can have a retroreflecting geometry.

The invention relates to a cannula arrangement comprising a cannula tube extending longitudinally between a distal cannula end and a proximal cannula end and having a distal cannula tip, and a cannula connector arranged at the proximal cannula end. The cannula arrangement further comprises a locating lance extending longitudinally between a distal lance end and a proximal lance end and arranged to be axially movable along a longitudinal axis of the cannula tube, wherein the locating lance has a locating element at its distal end, which is configured to be located by means of an ultrasound imaging method.The cannula assembly further comprises an actuating device, which is configured for manual operation, is operatively connected to the locating lance, and by means of which the locating lance can be moved from a starting position to a locating position, wherein in the starting position the locating element is arranged inside the cannula tube and in the locating position the locating element is arranged distally outside the cannula tube, projecting from the cannula tip. The invention also relates to an ultrasound system for use in an ultrasound imaging procedure, comprising the locating lance.

The invention relates to a cannula arrangement comprising a cannula with a cannula tube extending longitudinally between a distal cannula end and a proximal cannula end and having a distal cannula tip, and a coil unit configured for control by means of a control device and comprising at least one coil arranged on the cannula tube, wherein the coil unit is configured to generate a magnetic field around the cannula. The invention further relates to a method for determining the position of a cannula in an ultrasound image, comprising the steps of: generating a magnetic field around the cannula by means of a coil unit, wherein the coil unit is arranged on a cannula tube of the cannula; measuring a magnetic field strength generated by the coil unit by means of a measuring device; and determining the position of the cannula as a function of the measured magnetic field strength.The invention further relates to a medical system for determining the position of a cannula.

cannula (10) comprising a cannula body (12) extending longitudinally along a longitudinal axis (L), a cannula tip (11) arranged at a distal end of the cannula body (12) and several sensors (13) for receiving an ultrasonic signal (B, B'), wherein the sensors (13) are arranged on a surface of the cannula body (12) at a known axial distance (d) to the cannula tip (11), so that by evaluating the received ultrasound signal (B, B') a position (P') of the sensors (13) and thereby a position (P) of the cannula tip (11) can be determined.

The invention relates to a method for determining the position of a cannula tip inside a body, comprising the steps of: providing an ultrasound transducer of an ultrasound imaging system; providing a transmitter comprising several ultrasound position transmitters and at least one mounting section; attaching the transmitter to the ultrasound transducer, wherein the transmitter is detachably attached to the ultrasound transducer by means of the mounting section and is fixed to the ultrasound transducer in a defined relative position to the ultrasound transducer; coupling several ultrasound position signals into the body, wherein the ultrasound position signals are coupled in by means of the several ultrasound position transmitters; receiving the ultrasound position signals, wherein the ultrasound position signals are received by means of a sensor attached to a cannula located in the body and arranged at a known axial distance from its cannula tip;Determining the signal transit times of the ultrasound position signals, wherein the signal transit times are determined by means of an evaluation unit connected to the sensor and the transmitter; determining the position of the cannula tip in relation to the ultrasound transducer, wherein the position is determined by means of the evaluation unit as a function of the signal transit times, the relative position of the transmitter to the ultrasound transducer and the axial distance of the sensor from the cannula tip. The invention also relates to a medical system for determining the position of a cannula tip.

A method for determining a position of a cannula tip inside a body includes coupling an ultrasonic signal into the body using an ultrasound probe resting on the body and along an imaging plane. The imaging plane extends along a depth direction and a transverse direction. The ultrasonic signal is received by a plurality of sensors attached to a cannula located in the body and arranged at known axial distances to the cannula tip and to each other along a longitudinal axis of the cannula. The received ultrasonic signals are compared with regard to their signal amplitudes and their signal waveforms by an evaluation device connected to the sensors. The position of the catheter tip relative to the ultrasound probe is determined by the evaluation device depending on the comparison of the signal amplitudes and signal waveforms. A medical system is configured for carrying out the method.