33 results about "Tourniquet cuff" patented technology

A tourniquet cuff has minimal flow restrictions within its pneumatic passageway under normal operating conditions, has a substantially reduced likelihood of partial or complete obstructions or interruptions of the pneumatic passageway under foreseeable operating conditions, can indicate exposure of the cuff to external agents that are capable of affecting the integrity of the pneumatic passageway before use, and can be manufactured economically.

A low-cost disposable tourniquet cuff includes: a first sheet formed of flexible material that is impermeable to gas; a second sheet facing the first sheet and formed of flexible material impermeable to gas; a bladder seal joining the first sheet to the second sheet around a perimeter to form an inflatable bladder within the perimeter; port means communicating pneumatically with the bladder and releasably connectable to a tourniquet instrument; stiffener means contained within the inflatable bladder and formed of gas-impermeable material less flexible than the first sheet, wherein the stiffener means has a stiffener width dimension less than the bladder width dimension and is joined to the first sheet to form a non-inflatable portion of the first sheet; and securing means attached to the non-inflatable portion of the first sheet and adapted to allow a surgical user to releasably secure the cuff around the limb at the desired location so that the bladder overlaps upon itself.

A occlusion detector for a dual-port surgical tourniquet system comprises: a tourniquet cuff for encircling a patient's limb and including an inflatable portion that communicates pneumatically with a first cuff port and that communicates pneumatically with a second cuff port independently of the first cuff port; a tourniquet instrument that is releasably connectable to the first and second cuff ports to establish first and second pneumatic passageways between the tourniquet cuff and the tourniquet instrument, wherein the tourniquet instrument includes pressure sensing means communicating with the first pneumatic passageway for producing an indication of the pressure in the cuff over a time period suitably long for the performance of a surgical procedure, pressure regulation means communicating with the second pneumatic passageway for regulating the pressure in the cuff near a reference pressure level, and an occlusion detector for introducing a pneumatic pressure pulse into the first pneumatic passageway during an occlusion detection time period, for monitoring the pressure in the second pneumatic passageway during the occlusion detection time period, and for producing an occlusion alarm if a fluctuation of pressure in the second pneumatic passageway is not detected within the occlusion detection time period.

Improved tourniquet apparatus for measuring a patient's limb occlusion pressure includes an inflatable tourniquet cuff for encircling a limb at a location and to which a tourniquet instrument is releasably connectable. The instrument includes pressure sensing for producing a cuff pressure signal indicative of the level of pressure in the cuff, a pressure regulation mechanism communicating with the cuff and responsive to the cuff pressure signal for moving fluid into and out of the cuff, thereby regulating the pressure in the cuff, a blood flow transducer for producing a blood flow signal indicative of blood flow past the cuff, and limb occlusion pressure means responsive to the blood flow signal and the cuff pressure signal for increasing the cuff pressure level until blood flow indicated by the blood flow signal decreases to a level less than a minimum detection threshold, and then suspending fluid movement into and out of the cuff to produce a limb occlusion pressure value that is indicative of a pressure in the cuff when the fluid motion is suspended.

A low-cost disposable tourniquet cuff having improved safety includes a cuff with opposing ends and an inflatable bladder having a first bladder side and a second bladder side. The bladder has a length dimension that is greater than the circumference of a limb of a patient at a desired limb location for applying the cuff, but less than the distance between first and second cuff ends. A port is provided for inflating the bladder, and a fastener is attached to the second bladder side and adapted to allow the surgical user to releasably secure the fastener to the first bladder side only if the cuff overlaps upon itself by at least a predetermined minimum cuff overlap length at the desired limb location.

A low-cost disposable tourniquet cuff includes: a first sheet formed of flexible material that is impermeable to gas; a second sheet facing the first sheet and formed of flexible material impermeable to gas; a bladder seal joining the first sheet to the second sheet around a perimeter to form an inflatable bladder within the perimeter; port means communicating pneumatically with the bladder and releasably connectable to a tourniquet instrument; stiffener means contained within the inflatable bladder and formed of gas-impermeable material less flexible than the first sheet, wherein the stiffener means has a stiffener width dimension less than the bladder width dimension and is joined to the first sheet to form a non-inflatable portion of the first sheet; and securing means attached to the non-inflatable portion of the first sheet and adapted to allow a surgical user to releasably secure the cuff around the limb at the desired location so that the bladder overlaps upon itself.

A low-cost disposable tourniquet cuff having improved safety includes a cuff with opposing ends and an inflatable bladder having a first bladder side and a second bladder side. The bladder has a length dimension that is greater than the circumference of a limb of a patient at a desired limb location for applying the cuff, but less than the distance between first and second cuff ends. A port is provided for inflating the bladder, and a fastener is attached to the second bladder side and adapted to allow the surgical user to releasably secure the fastener to the first bladder side only if the cuff overlaps upon itself by at least a predetermined minimum cuff overlap length at the desired limb location.

An adaptive tourniquet cuff system comprises: a tourniquet cuff having a physical characteristic and including an inflatable bladder of a length greater than the circumference of a limb at a selected location; a cuff connector carried on the cuff and communicating pneumatically with the bladder for releasably connecting to a tourniquet instrument to establish a gas-tight passageway between the bladder and the tourniquet instrument; and an identifying collar including identification means indicative of the physical characteristic and detectable by the tourniquet instrument upon establishment of the gas-tight passageway. The tourniquet instrument may supply gas to the bladder through the gas-tight passageway at a pressure sufficient to stop arterial blood flow into the limb distal to the cuff at the selected location, and may adapt its operation in response to the detected physical characteristic of the cuff.

Tourniquet apparatus for rapidly and accurately measuring a patient's limb occlusion pressure comprises: an inflatable tourniquet cuff for encircling a limb at a location; a tourniquet instrument releasably connectable to the cuff that includes: pressure sensing means for producing a cuff pressure signal indicative of the level of pressure in the cuff; pressure regulation means communicating with the cuff and responsive to the cuff pressure signal for regulating the pressure in the cuff near a reference pressure level; blood flow transducing means adapted for applying to a portion of the limb distal to the cuff to produce a blood flow signal indicative of blood flow in the portion; and limb occlusion pressure means responsive to the blood flow signal and the cuff pressure signal and operable for detecting arterial pulsations of blood flow, for increasing the reference pressure level in synchrony with the arterial pulsations and for producing a limb occlusion pressure value indicative of the lowest cuff pressure at which the magnitude of the arterial pulsations is less than a minimum detection threshold.

Improved tourniquet apparatus for measuring a patient's limb occlusion pressure includes an inflatable tourniquet cuff for encircling a limb at a location and to which a tourniquet instrument is releasably connectable. The instrument includes pressure sensing for producing a cuff pressure signal indicative of the level of pressure in the cuff, a pressure regulation mechanism communicating with the cuff and responsive to the cuff pressure signal for moving fluid into and out of the cuff, thereby regulating the pressure in the cuff, a blood flow transducer for producing a blood flow signal indicative of blood flow past the cuff, and limb occlusion pressure means responsive to the blood flow signal and the cuff pressure signal for increasing the cuff pressure level until blood flow indicated by the blood flow signal decreases to a level less than a minimum detection threshold, and then suspending fluid movement into and out of the cuff to produce a limb occlusion pressure value that is indicative of a pressure in the cuff when the fluid motion is suspended.

Low-cost tourniquet cuff apparatus includes: an inflatable bladder formed of flexible material having a bladder width dimension when the bladder is uninflated and a having a bladder length dimension sufficient for encircling a limb of a surgical patient at a desired location on the limb and for overlapping upon itself, wherein the bladder includes a bladder first inner surface facing a bladder second inner surface along the bladder length dimension and across the bladder width dimension when the bladder is uninflated; securing means for securing the overlapping bladder around the limb at the desired location; port means communicating pneumatically with the inflatable bladder and releasably connectable to a tourniquet instrument for supplying the bladder with pressurized gas; and stiffener means having a predetermined stiffness and having a stiffener width dimension less than the bladder width dimension, wherein the stiffener means is non-releasably attached to the bladder first inner surface within the inflatable bladder. The stiffener means may have a stiffener length dimension that is at least equal to the limb circumference. A method of making the low-cost tourniquet cuff allows the cuff elements to be simply assembled and then sealed in one operation using radio-frequency welding or a similar process.

Disclosed is a method and apparatus for regulating tourniquet cuff pressure based on a personalized tourniquet pressure (PTP) to facilitate safe performance of a surgical procedure. The apparatus includes a dual-purpose tourniquet cuff adapted to encircle a region of a patient limb to provide both a sensor during a pre-surgical time period and an effector during a surgical time period. An effector module communicates pneumatically with an inflatable bladder of the cuff for maintaining pressure in the bladder near a PTP during the surgical time period to safely stop penetration of arterial blood past the cuff. A pulsation sensor that communicates pneumatically with the inflatable bladder during the pre-surgical time period senses and characterizes pressure pulsations that are indicative of penetration of arterial blood into the region of the limb encircled by the cuff. A PTP estimator is responsive to the pulsation sensor for producing an estimate of the PTP, such that the estimate of the PTP is a function of the sensed pulsations.

A occlusion detector for a dual-port surgical tourniquet system comprises: a tourniquet cuff for encircling a patient's limb and including an inflatable portion that communicates pneumatically with a first cuff port and that communicates pneumatically with a second cuff port independently of the first cuff port; a tourniquet instrument that is releasably connectable to the first and second cuff ports to establish first and second pneumatic passageways between the tourniquet cuff and the tourniquet instrument, wherein the tourniquet instrument includes pressure sensing means communicating with the first pneumatic passageway for producing an indication of the pressure in the cuff over a time period suitably long for the performance of a surgical procedure, pressure regulation means communicating with the second pneumatic passageway for regulating the pressure in the cuff near a reference pressure level, and an occlusion detector for introducing a pneumatic pressure pulse into the first pneumatic passageway during an occlusion detection time period, for monitoring the pressure in the second pneumatic passageway during the occlusion detection time period, and for producing an occlusion alarm if a fluctuation of pressure in the second pneumatic passageway is not detected within the occlusion detection time period.

A biomedical interface pressure transducer which is useful for interposing between a limb or tissue and an occlusive band, tourniquet cuff or other biomedical apparatus in order to estimate the pressure and pressure gradient applied to a selected area of the limb or tissue is disclosed. The pressure transducer comprises a modified MEMS pressure sensor and a conformable semisolid body enclosed in a shear relief membrane which translates the pressure applied by the occlusive band to the modified MEMS pressure sensor mounted on a flexible substrate with patterned electrical interconnect tracks allowing the connection of the pressure sensor to digital communication and control circuitry.

Disclosed is a method and apparatus for regulating tourniquet cuff pressure based on a personalized tourniquet pressure (PTP) to facilitate safe performance of a surgical procedure. The apparatus includes a dual-purpose tourniquet cuff adapted to encircle a region of a patient limb to provide both a sensor during a pre-surgical time period and an effector during a surgical time period. An effector module communicates pneumatically with an inflatable bladder of the cuff for maintaining pressure in the bladder near a PTP during the surgical time period to safely stop penetration of arterial blood past the cuff. A pulsation sensor that communicates pneumatically with the inflatable bladder during the pre-surgical time period senses and characterizes pressure pulsations that are indicative of penetration of arterial blood into the region of the limb encircled by the cuff. A PTP estimator is responsive to the pulsation sensor for producing an estimate of the PTP, such that the estimate of the PTP is a function of the sensed pulsations.

The invention provides a tourniquet mechanism and a tourniquet, and relates to the technical field of medical instruments. The tourniquet mechanism comprises a left tourniquet mechanism body and a right tourniquet mechanism body; the left tourniquet mechanism body comprises a left tourniquet bottom plate and a left tourniquet side plate, the left tourniquet bottom plate is slidingly arranged on atourniquet base, the left tourniquet side plate is arranged on the left tourniquet bottom plate, and a C-type groove is formed in the left tourniquet side plate; the right tourniquet mechanism body comprises a right tourniquet mechanism body and a right tourniquet side plate, the right tourniquet mechanism body is arranged on the tourniquet base, the right tourniquet side plate is arranged on theright tourniquet bottom plate, and a C-type groove is formed in the right tourniquet side plate. The aim is to solve the technical problems that in the prior art, when tourniquet cuff is fastened manually, inconvenience is generated, labor intensity is high, and costs are high.

A tourniquet system for rapid automatic application of adequate pressure to stem bleeding of an injured limb while minimizing tissue damage due to excessive pressure. Pressure is supplied to the limb by inflation of a tourniquet cuff with compressed gas. The invention also relates to a method of controlling bleeding from a limb using the tourniquet system.

A surgical tourniquet cuff that includes a stabilizer component that facilitates application of an overlapping cuff around the limb of a patient. The stabilizer is fixed to the cuff, and requires no tying or similar user manipulation to secure the overlapping cuff in alignment with the underlying cuff. The stabilizer improves the stability of the inflated cuff to prevent sideways shifting motion of overlapping cuff portions as the cuff is applied to the limb. The stabilizer also provides a handle mechanism to enable the user to snugly apply the overlapping cuff around the patient's limb while the overlapping portions remain properly aligned along their long axes. The stabilizer is designed to also facilitate attaching together two tourniquet cuffs end-to-end, with respective bladders overlapping and in proper alignment so that those attached cuffs can be used as a single, extended surgical cuff applied around a patient's limb.

A surgical tourniquet cuff that includes a stabilizer component that facilitates application of an overlapping cuff around the limb of a patient. The stabilizer is fixed to the cuff, and requires no tying or similar user manipulation to secure the overlapping cuff in alignment with the underlying cuff. The stabilizer improves the stability of the inflated cuff to prevent sideways shifting motion of overlapping cuff portions as the cuff is applied to the limb. The stabilizer also provides a handle mechanism to enable the user to snugly apply the overlapping cuff around the patient's limb while the overlapping portions remain properly aligned along their long axes. The stabilizer is designed to also facilitate attaching together two tourniquet cuffs end-to-end, with respective bladders overlapping and in proper alignment so that those attached cuffs can be used as a single, extended surgical cuff applied around a patient's limb.

A low-cost disposable tourniquet cuff includes: a first sheet formed of flexible material that is impermeable to gas; a second sheet facing the first sheet and formed of flexible material impermeable to gas; a bladder seal joining the first sheet to the second sheet around a perimeter to form an inflatable bladder within the perimeter; port means communicating pneumatically with the bladder and releasably connectable to a tourniquet instrument; stiffener means contained within the inflatable bladder and formed of gas-impermeable material less flexible than the first sheet, wherein the stiffener means has a stiffener width dimension less than the bladder width dimension and is joined to the first sheet to form a non-inflatable portion of the first sheet; and securing means attached to the non-inflatable portion of the first sheet and adapted to allow a surgical user to releasably secure the cuff around the limb at the desired location so that the bladder overlaps upon itself.

The invention relates to a control apparatus (4) for a tourniquet device (1), to which tourniquet device a first compression cuff (2) and / or at least one second compression cuff can be connected, wherein the compression cuffs (2) that can be connected have different volumes and the tourniquet device (1) comprises an inflation apparatus (3) for inflating the connected compression cuff (2). According to the invention, in order to present a tourniquet apparatus that enables the most efficient and in particular fast inflation of the tourniquet cuff possible and at the same time the most error-free operation of the tourniquet apparatus possible, a parameter set for controlling an inflation process of the respective compression cuff (2) is associated with each compression cuff (2) and is stored in a data memory of the control apparatus (4), wherein the parameter set associated with each compression cuff (2) depends on the volume of the compression cuff (2). The invention further relates to a method for controlling a tourniquet device and a control system for controlling a tourniquet apparatus having a tourniquet device that comprises an inflation apparatus (3) and a control apparatus (4) and having a compression cuff (2) that can be applied to a limb and connected to the inflation apparatus.

A tourniquet cuff for placement on a limb, has an inflatable body 2 which encloses an inflatable chamber 1 and which can be inflated with a compressed gas so as to create blood flow restriction in thelimb, with the inflatable body 2 being formed from an elongated support 3 made of a bendable support material extending along a longitudinal direction and from a stretchable wall 4 made of a stretchable material attached to the support. In order to enable thorough and easy cleaning and sterilization of the tourniquet cuff and easy placement on a limb and to ensure the most uniform possible distribution of the pressure exerted by the tourniquet cuff on the limb, the stretchable wall is affixed to the elongated support while the stretchable material is stretched at least in the longitudinal direction. A method of manufacturing the tourniquet cuff is also disclosed.

Disclosed is a method and apparatus for regulating tourniquet cuff pressure based on a personalized tourniquet pressure (PTP) to facilitate safe performance of a surgical procedure. The apparatus includes a dual-purpose tourniquet cuff adapted to encircle a region of a patient limb to provide both a sensor during a pre-surgical time period and an effector during a surgical time period. An effector module communicates pneumatically with an inflatable bladder of the cuff for maintaining pressure in the bladder near a PTP during the surgical time period to safely stop penetration of arterial blood past the cuff. A pulsation sensor that communicates pneumatically with the inflatable bladder during the pre-surgical time period senses and characterizes pressure pulsations that are indicative of penetration of arterial blood into the region of the limb encircled by the cuff. A PTP estimator is responsive to the pulsation sensor for producing an estimate of the PTP, such that the estimate of the PTP is a function of the sensed pulsations.

A biomedical interface pressure transducer which is useful for interposing between a limb or tissue and an occlusive band, tourniquet cuff or other biomedical apparatus in order to estimate the pressure and pressure gradient applied to a selected area of the limb or tissue is disclosed. The pressure transducer comprises a modified MEMS pressure sensor and a conformable semisolid body enclosed in a shear relief membrane which translates the pressure applied by the occlusive band to the modified MEMS pressure sensor mounted on a flexible substrate with patterned electrical interconnect tracks allowing the connection of the pressure sensor to digital communication and control circuitry.

Disclosed are methods of manufacturing and inflating an elongated bladder of a tourniquet cuff that may be secured around the limb of a patient. The method includes sealing together side edges of layers of material to form the bladder, and stiffening the cuff with a stiffener for compressing the portion of the bladder underlying the stiffener inwardly toward the limb while preventing two layers of the cuff from contacting each other at a location adjacent to an edge of the cuff to thus provide a continuous pneumatic passageway in the bladder between the overlying stiffener and the sealed edge for distributing inflating gas through the passageway along the length of the bladder. The method also includes separating the layers that form the bladder with a flange member that together with the bottom layer of the bladder defines a channeled passageway extending away from a port opening in the bladder for delivering gas through the channeled passageway, beyond the flange member and into the inflatable bladder, such that pressurized gas received in the port opening is directed through the channeled passageway and toward the continuous pneumatic passageway that is adjacent to the sealed edge.

The invention relates to the technical field of medical treatment, in particular to a vein-pressing tourniquet which is used for carrying out vein pressing and blocking on a puncture hole after needlepuncturing, quickening healing and avoiding bleeding. The tourniquet comprises a fixed piece, wherein a pressing through hole is formed in the middle part of the fixed piece; the pressing through hole is externally provided with a guiding sleeve piece; a guiding hole which is of a hollow structure is formed in the middle part of the guiding sleeve piece; a pressing rod is arranged at the middle part of the guiding sleeve piece; a vein pressing piece is arranged at the bottom part of the pressing rod; a connecting post of the vein pressing piece penetrates through the through hole in the middle part of the fixed piece and is connected with the pressing rod. The vein-pressing tourniquet disclosed by the invention is convenient and labor-saving in use, and a down pressing force is uniform; due to a guiding function of the guiding sleeve piece, a phenomenon of shifting of down pressing cannot be caused, the bleeding amount of the puncture hole can be reduced, and congestion cannot be easily caused; a phenomenon that the structure is separated does not exist after use.

A hazard monitor (2) for a surgical tourniquet system, comprising: a pressure sensor device (20) for detecting the pressure in a pneumatic tourniquet sleeve (4); an electric power monitoring device (22) for monitoring the tourniquet Power supply of the electrical components of the instrument (8), wherein the tourniquet instrument (8) can be pneumatically connected to the tourniquet cuff (4) to supply pressurized gas to said cuff (4) so ​​that the Pressure is generated in (8); and hazard detection means (28), responsive to pressure sensing means (20) and power monitoring means (22), for operating in the tourniquet (4) when power is not supplied to said components An alarm signal is generated when pressure is detected in the

A personalized tourniquet cuff assembly comprises a sterile tourniquet cuff, a machine readable instrument symbol, machine-readable personalization data and a sterile connector. The instrument symbol identifies a predetermined first type of tourniquet instrument from a plurality of types of tourniquet instruments and is adapted for contactless reading by an optical tourniquet interface of the first type of tourniquet instrument. The personalization data represents a value of a personalization parameter for safe operation of the tourniquet cuff with the first type of tourniquet instrument and is adapted for contactless reading by the optical tourniquet interface. The connector is adapted for releasably connecting the tourniquet cuff to the first type of tourniquet instrument. The instrument symbol and the personalization data are carried at a location enabling contactless reading thereof only if the assembly is positioned within a predetermined range of distances and range of orientations relative to the optical tourniquet interface.