33 results about "Tourniquet cuff" patented technology

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.

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.

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.

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.

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.

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.

A tourniquet cuff has a body configured for being wrapped around a limb. The body has an unpressurized state and a pressurized state. A securing portion on the body is releasably engageable to the body. The cuff also has an indicator that operates in response to movement of the securing portion for locating where the securing portion engages the body in order to apply a predetermined amount of force sufficient to secure the body to a limb without causing significant venous occlusion at the limb when the body is in the unpressurized state.