DRUG INTRODUCTION WITH PRESSURE MEASUREMENT OF AND INTERMITTENT FLOW FOR IDENTIFICATION OF FLUID-FILLED ANATOMICAL SPACES AND INJECTION PROVISION THEREIN Russian patent published in 2017 - IPC A61M5/00 A61M31/00 

FIELD: medicine.

SUBSTANCE: space can take fluid at a pressure less than the pressure of tissues. The device contains a unit of disposable elements. The unit comprises a syringe having a main body for the fluid to be injected into the anatomical space. The syringe comprises a piston configured to move at one end of the main body to dispense fluid from the opposite end of the main body. The assembly includes tubes that are integrally connected to the opposite end of the main body. The assembly includes a needle connected to the tubes and having a tip adapted to be inserted into the patient and moved through tissues surrounding the anatomical space to search for this anatomical space. The unit includes a built-in electronic pressure transducer between the opposite end of the main body and one end of the tubes, to generate a signal corresponding to the instantaneous pressure at the tip of the needle. The apparatus comprises a drive unit connected to the syringe and electronic pressure transducer. The unit contains a control device with a computer. The unit comprises a memory to store the first selected pressure (P1) corresponding to fluid injection into the anatomical space. The unit includes an engine connected to and controlled by the computer. The unit comprises a syringe valve connected to the engine with a syringe to move the piston into and out of the main body for injection and aspiration of the fluid from the anatomical space. The computer is programmed to control the engine to move the piston to provide a discontinuous flow of fluid to the patient until the first selected pressure (P1) is detected by the electronic pressure transducer. The engine stops working to stop the flow of additional fluid to the patient until the instantaneous pressure at the tip of the needle decreases to a value less than the first selected pressure. The program resumes engine operation to resume the flow of fluid to the patient while the needle is moving in the patient's tissues. The flow of fluid in the tissue stops at the instantaneous pressure exceeding the first selected pressure (P1), and resumes when the instantaneous pressure decreases to a value less than the first selected pressure to alert about the needle tip being in the anatomical space and for eventual resumption of fluid injection into the specified anatomical space. The storage device stores the second selected pressure (P2), the value of which is less than the value of the first selected pressure (P1) by the first selected value. The computer is programmed with a possibility of resuming the engine operation to resume piston movement, ensuring the resumption of the fluid flow to the tip of the needle when the instantaneous pressure is less than the value of the first selected pressure (P1) by the first selected value.

EFFECT: increased reliability and safety of epidural injection by limiting the volume of fluid to determine the epidural space.

17 cl, 10 dwg