US20210315589A1 - Tourniquet with lever tensioning mechanism - Google Patents
Tourniquet with lever tensioning mechanism Download PDFInfo
- Publication number
- US20210315589A1 US20210315589A1 US17/355,306 US202117355306A US2021315589A1 US 20210315589 A1 US20210315589 A1 US 20210315589A1 US 202117355306 A US202117355306 A US 202117355306A US 2021315589 A1 US2021315589 A1 US 2021315589A1
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- US
- United States
- Prior art keywords
- strap
- tourniquet
- baseplate
- lever
- operable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
- A61B17/132—Tourniquets
- A61B17/1322—Tourniquets comprising a flexible encircling member
- A61B17/1327—Tensioning clamps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
- A61B17/132—Tourniquets
- A61B17/1322—Tourniquets comprising a flexible encircling member
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
- A61B17/132—Tourniquets
- A61B17/1322—Tourniquets comprising a flexible encircling member
- A61B17/1325—Tourniquets comprising a flexible encircling member with means for applying local pressure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T24/00—Buckles, buttons, clasps, etc.
- Y10T24/21—Strap tighteners
- Y10T24/2143—Strap-attached folding lever
- Y10T24/2147—Strap tightener
Definitions
- This invention relates generally to tourniquets and more particularly to self-applied tourniquets.
- Tourniquets are known and used for stopping blood flow preventing massive hemorrhage which can result in death. Massive hemorrhage remains the number one cause of preventable death on the battlefield despite current tourniquet use. Catastrophic limb injuries are not unique to the battlefield and can occur in the civilian sector with motor vehicle accidents, industrial accidents, agricultural accidents and active shooter episodes.
- a tourniquet includes: a baseplate with first and second ends; a strap having first and second ends, the strap having a first portion adjacent its first end, and a second portion adjacent its second end; a lever with proximate and distal ends, wherein the proximate end is pivotally connected to the baseplate, and the distal end is free; wherein the first end of the strap is pivotally connected to the lever intermediate to the proximal and distal ends; and a connector assembly operable to selectively connect the second portion of the strap to the baseplate, so as to form a closed loop, the connector assembly operable to permit a length of the closed loop to be adjusted.
- FIG. 1 is a schematic perspective view showing an exemplary tourniquet
- FIG. 2 is an enlarged view of a portion of FIG. 1 ;
- FIG. 3 is a schematic top plan view of a portion of an alternative strap having a finger hole formed therein;
- FIG. 4 is a schematic top plan view of a portion of an alternative strap incorporating cut markings
- FIG. 5 is a perspective view showing an alternative lever end
- FIG. 6 is a perspective view showing an alternative strap end
- FIG. 7 is a schematic side elevational view showing an alternative embodiment of a baseplate with an integral pivot member
- FIG. 8 is a perspective view showing the baseplate and lever of FIG. 7 ;
- FIG. 9 is a perspective view showing a baseplate and a strap incorporating a hook member
- FIG. 10 is a perspective view showing a baseplate and a strap incorporating a hook member
- FIG. 11 is a perspective view showing a baseplate and a strap incorporating an alternative hook member
- FIG. 12 is a perspective view showing a baseplate and a strap incorporating a snap buckle
- FIG. 13 is a perspective view showing a first step in using the tourniquet of FIG. 1 , with the tourniquet being initially applied to the limb of a patient;
- FIG. 14 is a perspective view showing a second step in using the tourniquet of FIG. 1 , with the strap being secured in a closed loop around the limb;
- FIG. 15 is a perspective view showing a third step in using the tourniquet of FIG. 1 , with a lever thereof being moved towards a tightened position;
- FIG. 16 is a perspective view showing a fourth step in using the tourniquet of FIG. 1 , with the lever moved to a fully tightened position;
- FIG. 17 is a perspective view showing a fifth step in using the tourniquet of FIG. 1 , with the lever being secured in the fully tightened position;
- FIG. 18 is a perspective view showing a sixth step in using the tourniquet of FIG. 1 , with the excess strap being secured over the lever;
- FIG. 19 is a schematic side elevational view showing an alternative, concave-curved baseplate in a first condition.
- FIG. 20 is a schematic side elevational view showing the baseplate of FIG. 19 in a second condition
- FIG. 21 is a schematic side elevational view showing an alternative, ramped baseplate
- FIG. 22 is a schematic end view of a baseplate showing a latch mechanism
- FIG. 23 is a perspective view showing a tourniquet constructed using an alternative baseplate.
- FIGS. 1 and 2 illustrate an exemplary tourniquet 10 .
- the basic components of the tourniquet 10 are a strap 12 , a baseplate 14 , and a lever 16 , each of which will be described in more detail below.
- the strap 12 is an elongated flexible member extending continuously between first and second ends 18 , 20 respectively.
- the strap may be described as having a first portion 17 adjacent the first end 18 and a second portion 19 adjacent the second end 20 .
- the strap 12 may be constructed from any material which is flexible and which is capable of withstanding a predetermined tensile force sufficient to cut off (occlude) blood flow in a patient's limb.
- suitable materials for the strap 12 include fabric and other textiles, plastics, metals, and combinations thereof.
- the strap 12 may be configured as a flat, band-like material as shown or may have another form, such as a tube, rope, or cable. In the illustrated example, the strap 12 comprises woven nylon webbing.
- the strap 12 incorporates suitable releasable connectors 22 .
- releasable refers to a connection that can be coupled and uncoupled in ordinary use without damage to the connectors.
- the connection is releasable without resorting to the use of tools.
- examples of releasable connectors include buttons, snaps, stud-type snap fasteners, magnets, or hook-and-loop type fasteners (e.g., VELCRO).
- the strap 12 incorporates hook-and-loop type fasteners.
- connectors are further configured such that the second portion 19 of the strap 12 may be folded over and attached to itself.
- one face or side of the strap 12 may incorporate a loop portion of a hook-and-loop fastener over all or a part of its area
- the opposed face or side of the strap 12 may incorporate a combined hook and loop portion of a hook-and-loop fastener over all or a portion of its area.
- FIG. 3 illustrates examples of optional features which may be provided to make it easier to manipulate the second end 20 of the strap 12 .
- an area at the second end 20 of the strap 12 includes an end marking 21 such as words, letters, symbols, patterns or colors which serve to make the second end 20 easily identifiable.
- the second end 20 may be provided with chamfered corners 23 to provide a lead-in element for feeding the second end 20 through the slots described below.
- the terminal part of the second end 20 for example about 19 mm (3 ⁇ 4 in.) may be smooth and free of fasteners or other protrusions to facilitate easy grasping.
- a finger hole 24 may be provided at or near the second end 20 . The finger hole 24 may be sized to permit use while wearing gloves.
- the basic length of the strap 12 may be selected to permit use with a range of users and for different limbs.
- the basic length may be suitable to encircle the largest limb of the largest possible user.
- a user may choose to shorten the strap 12 to avoid excess length and to reduce weight, permitting easier storage and transport.
- Some means may be provided to make it easier to shorten the strap 12 .
- cut markings 26 indicating predetermined length intervals and/or flat sections 28 configured to facilitate easy cutting with hand tools (e.g., scissors, pocketknife) may be provided along the length of the strap 12 , as seen in FIG. 4 .
- the fibers within the flat sections 28 may be consolidated (e.g.
- the cut markings 26 could indicate specific lengths, for example the maximum possible length required for use with a leg, or the maximum possible length required for use with an arm. Portions of the strap 12 near the flat sections 28 and/or cut markings 26 may be configured so that, after cutting, the remaining portion provides one or more of the original distal end features, such as: an end marking, chamfered corners, a smooth, protrusion-free end, or a finger hole.
- the baseplate 14 is a relatively thin, plate-like rigid or semi-rigid member.
- suitable material for the baseplate 14 include plastics, wood, metals, and combinations thereof
- the baseplate 14 is constructed as a flat plate of polymeric material with a generally rectangular plan view shape.
- the baseplate 14 includes a strap guide 30 at a first end 32 thereof (also referred to herein as an aft end).
- the purpose of the strap guide 30 is to permit axial movement of the strap 12 relative to the baseplate 14 , while preventing lateral movement of the strap 12 relative to the baseplate 14 .
- the strap guide 30 comprises a slot formed near the first end 32 of the baseplate 14 through which the first end 18 of the strap 12 is threaded.
- Other guide structures such as rails or flanges (not shown) could be used as an alternative.
- the baseplate 14 includes a lever anchor 34 .
- the lever anchor 34 comprises a closed loop 38 of nylon webbing or other flexible material which is fed through the lever 16 , and a pair of closely spaced slots 40 formed in the baseplate 14 .
- the lever anchor 34 is positioned at or near a second end 36 of the baseplate 14 , opposite to the first end 32 , but other locations are possible.
- the lever 16 is a substantially rigid member which is stiff enough to act as a lever.
- suitable material for the lever 16 include metals, plastics, wood, composites, and combinations thereof
- the lever 16 is constructed as a unitary or monolithic metallic element having a pair of side rails 42 interconnected by crossbars 44 .
- the side rails 42 may be curved such that the lever 16 has an arcuate shape when viewed in side elevation.
- the lever 16 includes a first pivot element 48 at a first or proximate end 50 thereof.
- the first pivot element 48 is connected to the lever anchor 34 such that the lever 16 can pivot relative to the baseplate 14 , about a pivot axis “A” passing through the first pivot element 48 . It is noted that this axis A is shown merely for reference and that its absolute location may vary depending on the tension in the closed loop 38 .
- the first pivot element 48 is defined by one of the crossbars 44 which is captured by the closed loop 38 of the lever anchor 34 .
- the lever 16 is configured such that it can be manually pivoted about the first pivot element, and may include a handle element 49 for the purpose of providing leverage.
- the handle element 49 is defined by another one of the crossbars 44 located at a second or distal end 52 of the lever 16 .
- the handle element 49 may be contoured or shaped to provide a protruding portion for the purpose of making it easier to grip.
- FIG. 5 illustrates a variation of a handle element 149 which is curved outwards, defining a convex finger pull 150 . This may be implemented in conjunction with a modified lock tab 158 including a cutout 160 to provide access to the finger pull 150 .
- the lever 16 includes a second pivot element 54 positioned in an intermediate location between the proximate end 50 and the distal end 52 .
- the second pivot element 54 is defined by another one of the crossbars 44 .
- the first end 18 of the strap 12 is connected to the second pivot element 54 such that the lever 16 can pivot relative to the strap 12 .
- the first end 18 of the strap 12 may be wrapped around the second pivot element 54 and then secured to itself using conventional stitching.
- the tourniquet 10 may incorporate a means for moving the first end 18 of the strap 12 to different positions between the proximate end 50 and the distal end 52 .
- FIG. 6 shows a first end 18 of the strap 12 wrapped around a representative crossbar 44 and secured to itself using heavy-duty snaps 45 or another similar releasable fastener.
- the first end 18 could be moved by opening the snaps 45 , placing the strap and around a different crossbar, and then re-securing the snaps 45 .
- the effect of moving the first end 18 would be to change the mechanical advantage of the lever 16 on the strap 12 , with a corresponding inverse effect on the displacement of the strap 12 . This adjustment may be used to tailor the performance of the tourniquet 10 to an individual user's preference.
- the lever 16 , baseplate 14 , and strap 12 are assembled such that the lever 16 is movable in a pivoting motion about the pivot axis A. Movement from the released position to the tightened position causes the first end 18 of the strap 12 to be drawn through the strap guide 30 . This movement causes a free length of the strap 12 , defined as an amount of the strap 12 extending beyond the perimeter of the baseplate 14 , to be reduced.
- FIGS. 7 and 8 illustrate an optional variation of the baseplate 14 in which the closed loop 38 described above is eliminated, and one of the slots 40 is replaced by a rigid, generally U-shaped member 51 which is formed as part of the baseplate 14 and which captures the first pivot element 48 of the lever 16 .
- a lock tab 58 is provided in the form of a strap of flexible material which is looped around the handle element 48 of the lever 16 .
- the lock tab 58 incorporates suitable releasable connectors 60 .
- the illustrated example shows a patch of hook-and-loop fastener material.
- the lock tab 58 may incorporate one or more features to make it easier to identify and/or manipulate, as described above for the second end 20 of the strap 12 , for example, an end marking, chamfered corners, a smooth, protrusion-free end, or a finger hole.
- the lever 16 and/or the baseplate 14 may incorporate a latch or other similar mechanism operable to connect the lever 16 to the baseplate 14 , thereby securing the lever in the tightened position.
- FIGS. 7, 8, and 22 illustrate a latch 59 comprising a pair of spaced-apart generally L-shaped resilient hooks 61 with barbed tips protruding from the baseplate 14 near its second end 36 .
- the hooks 61 are positioned such that the lever 16 can pass around them when it is moved to the tightened position. When the lever 16 reaches the fully tightened position the barbed ends of the hooks 61 engage it and prevent it from being released.
- the hooks 61 can be released by squeezing them together, or alternatively, the lever 16 could be pulled up with sufficient force to disengage the hooks 61 .
- the tourniquet 10 includes a “connector assembly” operable to selectively connect the second portion 19 of the strap 12 to the baseplate 14 , so as to form a closed loop.
- the connector assembly is operable to permit a length of the closed loop to be adjusted (i.e., lengthened or shortened). It will be understood that the connector assembly may be a discrete element, or it may be defined in whole or part by the strap 12 , the baseplate 14 , or some combination thereof.
- one of the slots 40 described above located at the second end 36 of the baseplate 14 accepts the second end 20 of the strap 12 .
- the second portion 19 of the strap 12 can be passed through the slot 40 , pulled to a desired position (i.e., adjusted), and then folded back and connected to the remainder of the strap 12 using the releasable connector 22 .
- the second portion 19 of the strap 12 may be connectable to the baseplate 14 using a hook-type connection wherein one of the baseplate 14 and the strap 12 includes a female element, and the other of the baseplate 14 and the strap 12 includes a complementary male element.
- the second portion 19 of the strap 12 may have a flat hook 62 attached thereto as seen in FIG. 9 , with a slot 64 that permits adjustment of the strap 12 .
- the end of the flat hook 62 can in turn be engaged with one of the slots 40 of the baseplate 14 .
- a different anchor may be provided for the end of the flat hook 62 .
- a ring 63 with a generally rectangular shape and made of a rigid material such as metal or plastic is attached to the closed loop 38 of the lever anchor 34 .
- the closed loop 38 is simply passed through the center of the ring 63 .
- the ring 63 could be secured to the closed loop 38 using stitching or some other fastening method (not shown) to force it to remain in a specific position.
- the end of the flat hook 62 can be engaged with the ring 63 . This provides a secure connection point and prevents stresses on the baseplate 14 , especially the slot 40 .
- FIG. 11 shows an example of another type of hook 162 that may be attached to the second portion 19 of the strap 12 .
- the hook 162 includes a slot 164 that permits adjustment of the strap 12 .
- the hook 162 has a generally S-shaped body that defines two separate, parallel engagement slots 166 , 168 that are open at opposite sides of the hook body. Either of the engagement slots 166 , 168 can be engaged directly with the closed loop 38 . This avoids fatigue on the baseplate 14 , and permits use from either direction (left or right). This is another example of a “connector assembly”.
- the second portion 19 of the strap 12 may have a first half 66 of a known type of connector such as a snap buckle 68 attached thereto, and the second half 70 of the snap buckle 68 may be attached to the second end 36 of the baseplate 14 .
- the two halves of the snap buckle 68 may be engaged by pushing them together, and may be separated by depressing the tang 72 of the first half 70 .
- the first half 70 includes a slot 74 that permits adjustment of the strap 12 .
- the snap buckle 68 (or any of the connector assemblies described above) may be attached directly to the baseplate 14 , or by using an intervening strap 69 .
- the tourniquet 10 may incorporate a counter-pull handle, defined as an element which permits a user to grasp and pull the first end 32 of the baseplate 14 .
- a counter-pull handle 76 comprises a loop of cord with distal ends 78 fed through holes 80 in the baseplate 14 and secured by ferrules 82 .
- FIGS. 13-18 The use of the tourniquet 10 will now be described with reference to FIGS. 13-18 .
- the tourniquet 10 is being shown applied to a limb “L” which happens to be a user's thigh; however, it will be understood that the usage steps are similar for any limb.
- the tourniquet 10 may be stored in a compact configuration by coiling the strap 12 around the baseplate 14 and using the releasable connector 22 of the strap 12 to secure the strap 12 in the coiled configuration. Before carrying out the following steps, the tourniquet 10 would be retrieved and the strap uncoiled to prepare it for use. Alternatively, the tourniquet 10 may be used as a belt by wrapping the strap 12 around a user's torso and using the releasable connector 22 of the strap 12 to secure the strap 12 .
- use begins by placing the tourniquet 10 with the baseplate 14 against the limb L. If the end of the limb L is free, the second portion 19 of the strap 12 may be pre-looped through the slot 40 in the baseplate 14 , or the flat hook 62 or snap buckle 68 described above may be pre-connected. Then the entire tourniquet 10 already formed in a closed loop may be slipped over the free end of the limb L and moved into position. However, there may be circumstances where this is undesirable or impossible. For example, a user's foot may be trapped underneath a vehicle or building rubble. Under such circumstances, the second portion 19 of the strap 12 would initially be disconnected from the baseplate 14 . After bringing the second portion 19 around the limb L, the second portion 19 of the strap 12 would then be connected to the baseplate 14 , i.e., by using the slot 40 , the flat hook 62 , or the snap buckle 68 as provided.
- a second step shown in FIG. 14 , the second portion 19 of the strap 12 is wrapped around the body of the strap 12 and is pulled taut in order to remove the majority of the slack from the strap 12 .
- the term “majority of the slack” refers to pulling the strap 12 sufficiently taut so that operation of the lever 16 will tighten the strap 12 enough to cut off blood flow to the limb L.
- the exact tension to be used will depend on the specific user. The user may be trained or provided with instructions as to how to properly remove the majority of the slack.
- the step of removing the majority of the slack may also be referred to as pre-tensioning the tourniquet 10 .
- the user may pull this in opposition to the pulling taut motion, either to make this step easier or to prevent unwanted movement of the tourniquet 10 relative to the limb L.
- the lever itself 16 could alternatively be used for this purpose.
- the strap 12 is connected to itself in order to form (collectively with the baseplate 14 ) a closed loop around the limb L.
- the connection may be accomplished using the releasable fasteners 22 .
- the lever 16 is pivotally actuated by moving it from the released position towards the tightened position, as shown by the arrow in the figure. This may be done, for example by pulling sharply on the lock tab 58 or the lever 16 , itself, in a continuous motion.
- the lever 16 is pivotally actuated, the first end 18 of the strap 12 is drawn through the strap guide 30 , while simultaneously the lever 16 applies tension to the lever anchor 34 .
- the overall effect is to shorten the length of the closed loop formed by the baseplate 14 , the lever 16 , and the strap 12 , thus supplying clamping pressure to the limb L and cutting off blood flow in the blood vessel.
- the strap guide 30 helps prevent the strap 12 from becoming twisted or misaligned during the tightening operation.
- FIG. 16 shows the lever 16 in the fully tightened position.
- FIG. 17 shows the lock tab 58 connected to the strap 12 using the releasable fastener 60 , engaging releasable fasteners 22 of the strap 12 . This prevents the lever 16 from moving out of the tightened position. It is noted that the lever 16 has an over-center motion, and so only a small amount of force is required to hold it in the tightened position, even though the tourniquet 10 may be applying a very high clamping force.
- the free end of the strap 12 may be wrapped around the body of the tourniquet 10 , covering the baseplate 14 , lever 16 , and lock tab 58 , and secured to the lock tab 58 , as shown in FIG. 18 .
- the free end of the strap 12 performs a function of cutting off blood flow, with a very small exterior profile and no protruding exterior element that could protrude, catch on objects, or become dislodged from its locked position, limiting the user's mobility and possibly causing additional injury.
- the baseplate 14 may not be completely rigid and therefore will tend to bend in a convex shape, conforming to the curvature of the limb L, when the tourniquet 10 is applied. It is possible under some circumstances that the corners or edges of the baseplate 14 might tend to cause pinching of the limb L. This possibility may be addressed with the use of a baseplate which is concave-curved in a resting state.
- FIG. 19 shows a baseplate 114 with this concave curvature. This may be substituted for the baseplate 14 described above. Thus curved, the baseplate would be spaced away from the limb L and would not tend to pinch.
- the baseplate 114 would tend to flatten out to a deflected shape is shown in FIG.
- FIG. 21 shows a baseplate 214 with ramped ends 215 .
- FIG. 23 illustrates a tourniquet 310 constructed using an alternative baseplate 314 along with a strap 12 and lever 16 as described above.
- the baseplate 314 is a relatively thin, plate-like rigid or semirigid member.
- suitable material for the baseplate 314 include plastics, wood, metals, and combinations thereof
- the baseplate 14 is constructed as an injection-molded polymeric component with a generally rectangular plan view shape. It has first and second ends 332 , 336 , respectively, and these ends may be ramped as described above.
- the baseplate 314 includes a strap guide 330 in the form of a slot formed near the first end 332 of the baseplate 314 .
- the first portion 17 of the strap 12 is threaded through the strap guide 330 .
- the baseplate 314 includes an integral lever anchor 334 between the first and second ends 332 , 336 .
- the lever anchor 334 comprises a resilient flange 338 formed integrally with the body of the baseplate 314 .
- integral refers to components which functionally and/or physically form part of a unitary or monolithic whole.
- components which are machined from a single piece of material, formed as part of an additive manufacturing process, or formed as part of an injection molding process may be considered physically and functionally integral, unitary, or monolithic.
- separate components which are securely attached to each other by means such as fasteners, mechanical joints, thermal or sonic bonding, or adhesives may be considered functionally integral, unitary, or monolithic.
- the flange 338 is shaped so as to define a transverse channel 339 which captures the first pivot element 48 of the lever 16 .
- the flange 338 may be constructed so as to lie tightly against the surface of the baseplate 314 , and may include an upturned lead-in feature 340 at its distal end. This facilitates initial assembly, by permitting the lever 16 to be forced between the flange 338 and the baseplate 314 . Once the lever enters the channel 339 , the flange 338 snaps back into place against the surface of the baseplate 314 , and strongly resists removal of the lever 16 .
- a resilient hook 362 is integrally formed as part of the baseplate 314 , positioned at or near the second end 336 .
- the hook 362 may be constructed so as to lie lightly against the surface of the baseplate 314 , and may include an upturned lead-in feature 364 at its distal end.
- a ring 365 with a generally rectangular shape and made of a rigid material such as metal or plastic is attached to the second portion 19 of the strap 12 .
- the ring 365 includes a first slot 367 which is sized to fit the strap 12 with a relatively “tight” (e.g., friction) fit.
- the exposed portion of the ring 365 , and a second slot 369 are collectively sized to fit the hook 362 .
- the strap 12 is simply passed through the first slot 367 .
- the end of the ring 365 can be engaged with the lead-in feature 364 and then pulled into full engagement with the hook 362 .
- the spring tension inherent in the hook 362 is made sufficiently light that the ring 365 can be easily removed if necessary.
- the second portion 19 of the strap 12 can be pulled to a desired position (i.e., adjusted), and then folded back and connected to the remainder of the strap 12 using the releasable connector 22 .
- the combined structure of the hook 362 and the ring 365 is another example of a “connector assembly”.
- the baseplate 314 may optionally incorporate a latch or other similar mechanism (not shown) similar to the latch 59 described above.
- the baseplate 314 may incorporate a slot 337 at or near the second end 336 . This is similar to the slots 40 described above, and may be used as an alternative to the hook 362 to connect the second portion 19 of the strap 12 , in the manner described above.
- This version of the baseplate 314 provides for simplified construction and lower parts count.
- the basic usage of the tourniquet 310 is substantially similar to that of the tourniquet 10 described above.
- the tourniquet described above has numerous advantages over pre-existing tourniquets.
- the tourniquet is of a lighter weight, is a more compact package for easier storage, is easily and more rapidly applied by a user, and has no protruding portions which could limit the users range of motion, become caught on objects and or become dislodged from its locked position rendering the device useless.
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Abstract
A tourniquet includes: a baseplate with first and second ends; a strap having first and second ends, the strap having a first portion adjacent its first end, and a second portion adjacent its second end; a lever with proximate and distal ends, wherein the proximate end is pivotally connected to the baseplate, and the distal end is free; wherein the first end of the strap is pivotally connected to the lever intermediate to the proximal and distal ends; and a connector assembly operable to selectively connect the second portion of the strap to the baseplate, so as to form a closed loop, the connector assembly operable to permit a length of the closed loop to be adjusted.
Description
- This invention relates generally to tourniquets and more particularly to self-applied tourniquets.
- Tourniquets are known and used for stopping blood flow preventing massive hemorrhage which can result in death. Massive hemorrhage remains the number one cause of preventable death on the battlefield despite current tourniquet use. Catastrophic limb injuries are not unique to the battlefield and can occur in the civilian sector with motor vehicle accidents, industrial accidents, agricultural accidents and active shooter episodes.
- When a major blood vessel is cut, a short period of time is available to stop the flow of blood and prevent massive hemorrhage and ultimately death.
- It is helpful to provide a tourniquet that can be self-applied by the injured person as medical personnel may not be readily available. Self-applied tourniquets are known and used in the art.
- One problem with existing self-applied tourniquets is that they require the use of a winding stick, (or windlass), which is used to tension the tourniquet and occlude the arterial blood flow. The stick and other parts of the tourniquet can protrude, catch on objects, become dislodged from its locked position and at times not work. With the windlass dislodged, tourniquet effect is lost creating problems during transport and possibly demise. The windlass also adds weight and increases the bulk of the tourniquet, making it more difficult to store and to carry.
- This problem is addressed by a self-applied tourniquet utilizing a lever tensioning mechanism.
- According to one aspect of the technology described herein, a tourniquet includes: A tourniquet includes: a baseplate with first and second ends; a strap having first and second ends, the strap having a first portion adjacent its first end, and a second portion adjacent its second end; a lever with proximate and distal ends, wherein the proximate end is pivotally connected to the baseplate, and the distal end is free; wherein the first end of the strap is pivotally connected to the lever intermediate to the proximal and distal ends; and a connector assembly operable to selectively connect the second portion of the strap to the baseplate, so as to form a closed loop, the connector assembly operable to permit a length of the closed loop to be adjusted.
- The invention may be best understood by reference to the following description taken in conjunction with the accompanying drawing figures, in which:
-
FIG. 1 is a schematic perspective view showing an exemplary tourniquet; -
FIG. 2 is an enlarged view of a portion ofFIG. 1 ; -
FIG. 3 is a schematic top plan view of a portion of an alternative strap having a finger hole formed therein; -
FIG. 4 is a schematic top plan view of a portion of an alternative strap incorporating cut markings; -
FIG. 5 is a perspective view showing an alternative lever end; -
FIG. 6 is a perspective view showing an alternative strap end; -
FIG. 7 is a schematic side elevational view showing an alternative embodiment of a baseplate with an integral pivot member; -
FIG. 8 is a perspective view showing the baseplate and lever ofFIG. 7 ; -
FIG. 9 is a perspective view showing a baseplate and a strap incorporating a hook member; -
FIG. 10 is a perspective view showing a baseplate and a strap incorporating a hook member; -
FIG. 11 is a perspective view showing a baseplate and a strap incorporating an alternative hook member; -
FIG. 12 is a perspective view showing a baseplate and a strap incorporating a snap buckle; -
FIG. 13 is a perspective view showing a first step in using the tourniquet ofFIG. 1 , with the tourniquet being initially applied to the limb of a patient; -
FIG. 14 is a perspective view showing a second step in using the tourniquet ofFIG. 1 , with the strap being secured in a closed loop around the limb; -
FIG. 15 is a perspective view showing a third step in using the tourniquet ofFIG. 1 , with a lever thereof being moved towards a tightened position; -
FIG. 16 is a perspective view showing a fourth step in using the tourniquet ofFIG. 1 , with the lever moved to a fully tightened position; -
FIG. 17 is a perspective view showing a fifth step in using the tourniquet ofFIG. 1 , with the lever being secured in the fully tightened position; -
FIG. 18 is a perspective view showing a sixth step in using the tourniquet ofFIG. 1 , with the excess strap being secured over the lever; -
FIG. 19 is a schematic side elevational view showing an alternative, concave-curved baseplate in a first condition; and -
FIG. 20 is a schematic side elevational view showing the baseplate ofFIG. 19 in a second condition; -
FIG. 21 is a schematic side elevational view showing an alternative, ramped baseplate; -
FIG. 22 is a schematic end view of a baseplate showing a latch mechanism; and -
FIG. 23 is a perspective view showing a tourniquet constructed using an alternative baseplate. - Referring to the drawings wherein identical reference numerals denote the same elements throughout the various views,
FIGS. 1 and 2 illustrate anexemplary tourniquet 10. The basic components of thetourniquet 10 are astrap 12, abaseplate 14, and alever 16, each of which will be described in more detail below. - The
strap 12 is an elongated flexible member extending continuously between first andsecond ends first portion 17 adjacent thefirst end 18 and asecond portion 19 adjacent thesecond end 20. Thestrap 12 may be constructed from any material which is flexible and which is capable of withstanding a predetermined tensile force sufficient to cut off (occlude) blood flow in a patient's limb. Nonlimiting examples of suitable materials for thestrap 12 include fabric and other textiles, plastics, metals, and combinations thereof. Thestrap 12 may be configured as a flat, band-like material as shown or may have another form, such as a tube, rope, or cable. In the illustrated example, thestrap 12 comprises woven nylon webbing. - The
strap 12 incorporates suitablereleasable connectors 22. As used herein the term “releasable” refers to a connection that can be coupled and uncoupled in ordinary use without damage to the connectors. In some aspects, the connection is releasable without resorting to the use of tools. By way of example and not of limitation, examples of releasable connectors include buttons, snaps, stud-type snap fasteners, magnets, or hook-and-loop type fasteners (e.g., VELCRO). In the illustrated example, thestrap 12 incorporates hook-and-loop type fasteners. These connectors are configured such that thestrap 12 may be coiled into a compact bundle and secured to itself. These connectors are further configured such that thesecond portion 19 of thestrap 12 may be folded over and attached to itself. For example, one face or side of thestrap 12 may incorporate a loop portion of a hook-and-loop fastener over all or a part of its area, and the opposed face or side of thestrap 12 may incorporate a combined hook and loop portion of a hook-and-loop fastener over all or a portion of its area. -
FIG. 3 illustrates examples of optional features which may be provided to make it easier to manipulate thesecond end 20 of thestrap 12. In one example, an area at thesecond end 20 of thestrap 12 includes an end marking 21 such as words, letters, symbols, patterns or colors which serve to make thesecond end 20 easily identifiable. In another example, thesecond end 20 may be provided withchamfered corners 23 to provide a lead-in element for feeding thesecond end 20 through the slots described below. In another example, the terminal part of thesecond end 20, for example about 19 mm (¾ in.) may be smooth and free of fasteners or other protrusions to facilitate easy grasping. Afinger hole 24 may be provided at or near thesecond end 20. Thefinger hole 24 may be sized to permit use while wearing gloves. - The basic length of the
strap 12 may be selected to permit use with a range of users and for different limbs. For example, the basic length may be suitable to encircle the largest limb of the largest possible user. A user may choose to shorten thestrap 12 to avoid excess length and to reduce weight, permitting easier storage and transport. Some means may be provided to make it easier to shorten thestrap 12. For example, cutmarkings 26 indicating predetermined length intervals and/orflat sections 28 configured to facilitate easy cutting with hand tools (e.g., scissors, pocketknife) may be provided along the length of thestrap 12, as seen inFIG. 4 . The fibers within theflat sections 28 may be consolidated (e.g. by thermal or ultrasonic bonding, adhesive sealing) so as to be resistant to fraying and unraveling after cutting; however, these sections otherwise retain the full strength characteristics of the remainder of thestrap 12. Optionally, thecut markings 26 could indicate specific lengths, for example the maximum possible length required for use with a leg, or the maximum possible length required for use with an arm. Portions of thestrap 12 near theflat sections 28 and/or cutmarkings 26 may be configured so that, after cutting, the remaining portion provides one or more of the original distal end features, such as: an end marking, chamfered corners, a smooth, protrusion-free end, or a finger hole. - The
baseplate 14 is a relatively thin, plate-like rigid or semi-rigid member. Nonlimiting examples of suitable material for thebaseplate 14 include plastics, wood, metals, and combinations thereof In the illustrated example, thebaseplate 14 is constructed as a flat plate of polymeric material with a generally rectangular plan view shape. - Referring to
FIG. 2 , thebaseplate 14 includes astrap guide 30 at afirst end 32 thereof (also referred to herein as an aft end). The purpose of thestrap guide 30 is to permit axial movement of thestrap 12 relative to thebaseplate 14, while preventing lateral movement of thestrap 12 relative to thebaseplate 14. In the illustrated example, thestrap guide 30 comprises a slot formed near thefirst end 32 of thebaseplate 14 through which thefirst end 18 of thestrap 12 is threaded. Other guide structures such as rails or flanges (not shown) could be used as an alternative. - The
baseplate 14 includes alever anchor 34. In the illustrated example, thelever anchor 34 comprises aclosed loop 38 of nylon webbing or other flexible material which is fed through thelever 16, and a pair of closely spacedslots 40 formed in thebaseplate 14. In the illustrated example thelever anchor 34 is positioned at or near asecond end 36 of thebaseplate 14, opposite to thefirst end 32, but other locations are possible. - The
lever 16 is a substantially rigid member which is stiff enough to act as a lever. Nonlimiting examples of suitable material for thelever 16 include metals, plastics, wood, composites, and combinations thereof In the illustrated example, thelever 16 is constructed as a unitary or monolithic metallic element having a pair of side rails 42 interconnected bycrossbars 44. The side rails 42 may be curved such that thelever 16 has an arcuate shape when viewed in side elevation. - The
lever 16 includes afirst pivot element 48 at a first orproximate end 50 thereof. Thefirst pivot element 48 is connected to thelever anchor 34 such that thelever 16 can pivot relative to thebaseplate 14, about a pivot axis “A” passing through thefirst pivot element 48. It is noted that this axis A is shown merely for reference and that its absolute location may vary depending on the tension in theclosed loop 38. In the illustrated example, thefirst pivot element 48 is defined by one of thecrossbars 44 which is captured by the closedloop 38 of thelever anchor 34. - The
lever 16 is configured such that it can be manually pivoted about the first pivot element, and may include ahandle element 49 for the purpose of providing leverage. In the illustrated example, thehandle element 49 is defined by another one of thecrossbars 44 located at a second ordistal end 52 of thelever 16. - Optionally, the
handle element 49 may be contoured or shaped to provide a protruding portion for the purpose of making it easier to grip. For example,FIG. 5 illustrates a variation of ahandle element 149 which is curved outwards, defining aconvex finger pull 150. This may be implemented in conjunction with a modifiedlock tab 158 including acutout 160 to provide access to thefinger pull 150. - The
lever 16 includes asecond pivot element 54 positioned in an intermediate location between theproximate end 50 and thedistal end 52. In the illustrated example, thesecond pivot element 54 is defined by another one of thecrossbars 44. Thefirst end 18 of thestrap 12 is connected to thesecond pivot element 54 such that thelever 16 can pivot relative to thestrap 12. For example, thefirst end 18 of thestrap 12 may be wrapped around thesecond pivot element 54 and then secured to itself using conventional stitching. - Optionally, the
tourniquet 10 may incorporate a means for moving thefirst end 18 of thestrap 12 to different positions between theproximate end 50 and thedistal end 52. For example,FIG. 6 shows afirst end 18 of thestrap 12 wrapped around arepresentative crossbar 44 and secured to itself using heavy-duty snaps 45 or another similar releasable fastener. Thefirst end 18 could be moved by opening thesnaps 45, placing the strap and around a different crossbar, and then re-securing thesnaps 45. The effect of moving thefirst end 18 would be to change the mechanical advantage of thelever 16 on thestrap 12, with a corresponding inverse effect on the displacement of thestrap 12. This adjustment may be used to tailor the performance of thetourniquet 10 to an individual user's preference. - Collectively, the
lever 16,baseplate 14, andstrap 12 are assembled such that thelever 16 is movable in a pivoting motion about the pivot axis A. Movement from the released position to the tightened position causes thefirst end 18 of thestrap 12 to be drawn through thestrap guide 30. This movement causes a free length of thestrap 12, defined as an amount of thestrap 12 extending beyond the perimeter of thebaseplate 14, to be reduced. - Alternative means may be provided for pivotal mounting of the
lever 16. For example,FIGS. 7 and 8 illustrate an optional variation of thebaseplate 14 in which the closedloop 38 described above is eliminated, and one of theslots 40 is replaced by a rigid, generallyU-shaped member 51 which is formed as part of thebaseplate 14 and which captures thefirst pivot element 48 of thelever 16. - Some means are provided for securing the
lever 16 in the tightened position. In the example shown inFIG. 1 , alock tab 58 is provided in the form of a strap of flexible material which is looped around thehandle element 48 of thelever 16. Thelock tab 58 incorporates suitablereleasable connectors 60. The illustrated example shows a patch of hook-and-loop fastener material. - Optionally, the
lock tab 58 may incorporate one or more features to make it easier to identify and/or manipulate, as described above for thesecond end 20 of thestrap 12, for example, an end marking, chamfered corners, a smooth, protrusion-free end, or a finger hole. - Alternatively, the
lever 16 and/or thebaseplate 14 may incorporate a latch or other similar mechanism operable to connect thelever 16 to thebaseplate 14, thereby securing the lever in the tightened position. For example,FIGS. 7, 8, and 22 illustrate alatch 59 comprising a pair of spaced-apart generally L-shapedresilient hooks 61 with barbed tips protruding from thebaseplate 14 near itssecond end 36. Thehooks 61 are positioned such that thelever 16 can pass around them when it is moved to the tightened position. When thelever 16 reaches the fully tightened position the barbed ends of thehooks 61 engage it and prevent it from being released. If there is a need to release thelever 16, for example if arterial occlusion is not achieved, then thehooks 61 can be released by squeezing them together, or alternatively, thelever 16 could be pulled up with sufficient force to disengage thehooks 61. - The
tourniquet 10 includes a “connector assembly” operable to selectively connect thesecond portion 19 of thestrap 12 to thebaseplate 14, so as to form a closed loop. The connector assembly is operable to permit a length of the closed loop to be adjusted (i.e., lengthened or shortened). It will be understood that the connector assembly may be a discrete element, or it may be defined in whole or part by thestrap 12, thebaseplate 14, or some combination thereof. - In the illustrated example, one of the
slots 40 described above located at thesecond end 36 of thebaseplate 14 accepts thesecond end 20 of thestrap 12. Thesecond portion 19 of thestrap 12 can be passed through theslot 40, pulled to a desired position (i.e., adjusted), and then folded back and connected to the remainder of thestrap 12 using thereleasable connector 22. This is an example of a “connector assembly”. - Alternatively, the
second portion 19 of thestrap 12 may be connectable to thebaseplate 14 using a hook-type connection wherein one of thebaseplate 14 and thestrap 12 includes a female element, and the other of thebaseplate 14 and thestrap 12 includes a complementary male element. For example, thesecond portion 19 of thestrap 12 may have aflat hook 62 attached thereto as seen inFIG. 9 , with aslot 64 that permits adjustment of thestrap 12. The end of theflat hook 62 can in turn be engaged with one of theslots 40 of thebaseplate 14. This is another example of a “connector assembly”. Alternatively, a different anchor may be provided for the end of theflat hook 62. For example,FIG. 10 shows a variation in which aring 63 with a generally rectangular shape and made of a rigid material such as metal or plastic is attached to theclosed loop 38 of thelever anchor 34. In the illustrated example, theclosed loop 38 is simply passed through the center of thering 63. Alternatively, thering 63 could be secured to theclosed loop 38 using stitching or some other fastening method (not shown) to force it to remain in a specific position. In use, the end of theflat hook 62 can be engaged with thering 63. This provides a secure connection point and prevents stresses on thebaseplate 14, especially theslot 40. -
FIG. 11 shows an example of another type ofhook 162 that may be attached to thesecond portion 19 of thestrap 12. Thehook 162 includes aslot 164 that permits adjustment of thestrap 12. Thehook 162 has a generally S-shaped body that defines two separate,parallel engagement slots engagement slots closed loop 38. This avoids fatigue on thebaseplate 14, and permits use from either direction (left or right). This is another example of a “connector assembly”. - Alternatively, as seen in
FIG. 12 , thesecond portion 19 of thestrap 12 may have a first half 66 of a known type of connector such as asnap buckle 68 attached thereto, and thesecond half 70 of thesnap buckle 68 may be attached to thesecond end 36 of thebaseplate 14. The two halves of thesnap buckle 68 may be engaged by pushing them together, and may be separated by depressing thetang 72 of thefirst half 70. Thefirst half 70 includes aslot 74 that permits adjustment of thestrap 12. This is yet another example of a “connector assembly”. The snap buckle 68 (or any of the connector assemblies described above) may be attached directly to thebaseplate 14, or by using an interveningstrap 69. - Optionally, the
tourniquet 10 may incorporate a counter-pull handle, defined as an element which permits a user to grasp and pull thefirst end 32 of thebaseplate 14. In the example shown inFIG. 8 , acounter-pull handle 76 comprises a loop of cord withdistal ends 78 fed throughholes 80 in thebaseplate 14 and secured byferrules 82. - The use of the
tourniquet 10 will now be described with reference toFIGS. 13-18 . In these figures, thetourniquet 10 is being shown applied to a limb “L” which happens to be a user's thigh; however, it will be understood that the usage steps are similar for any limb. - It is noted that the
tourniquet 10 may be stored in a compact configuration by coiling thestrap 12 around thebaseplate 14 and using thereleasable connector 22 of thestrap 12 to secure thestrap 12 in the coiled configuration. Before carrying out the following steps, thetourniquet 10 would be retrieved and the strap uncoiled to prepare it for use. Alternatively, thetourniquet 10 may be used as a belt by wrapping thestrap 12 around a user's torso and using thereleasable connector 22 of thestrap 12 to secure thestrap 12. - Referring to
FIG. 13 , use begins by placing thetourniquet 10 with thebaseplate 14 against the limb L. If the end of the limb L is free, thesecond portion 19 of thestrap 12 may be pre-looped through theslot 40 in thebaseplate 14, or theflat hook 62 or snapbuckle 68 described above may be pre-connected. Then theentire tourniquet 10 already formed in a closed loop may be slipped over the free end of the limb L and moved into position. However, there may be circumstances where this is undesirable or impossible. For example, a user's foot may be trapped underneath a vehicle or building rubble. Under such circumstances, thesecond portion 19 of thestrap 12 would initially be disconnected from thebaseplate 14. After bringing thesecond portion 19 around the limb L, thesecond portion 19 of thestrap 12 would then be connected to thebaseplate 14, i.e., by using theslot 40, theflat hook 62, or thesnap buckle 68 as provided. - In a second step, shown in
FIG. 14 , thesecond portion 19 of thestrap 12 is wrapped around the body of thestrap 12 and is pulled taut in order to remove the majority of the slack from thestrap 12. The term “majority of the slack” refers to pulling thestrap 12 sufficiently taut so that operation of thelever 16 will tighten thestrap 12 enough to cut off blood flow to the limb L. The exact tension to be used will depend on the specific user. The user may be trained or provided with instructions as to how to properly remove the majority of the slack. The step of removing the majority of the slack may also be referred to as pre-tensioning thetourniquet 10. If the optional counter-pull handle 76 is used, the user may pull this in opposition to the pulling taut motion, either to make this step easier or to prevent unwanted movement of thetourniquet 10 relative to the limb L. The lever itself 16 could alternatively be used for this purpose. - Once the slack is pulled out, the
strap 12 is connected to itself in order to form (collectively with the baseplate 14) a closed loop around the limb L. The connection may be accomplished using thereleasable fasteners 22. - In a third step, shown in
FIG. 15 , thelever 16 is pivotally actuated by moving it from the released position towards the tightened position, as shown by the arrow in the figure. This may be done, for example by pulling sharply on thelock tab 58 or thelever 16, itself, in a continuous motion. As thelever 16 is pivotally actuated, thefirst end 18 of thestrap 12 is drawn through thestrap guide 30, while simultaneously thelever 16 applies tension to thelever anchor 34. The overall effect is to shorten the length of the closed loop formed by thebaseplate 14, thelever 16, and thestrap 12, thus supplying clamping pressure to the limb L and cutting off blood flow in the blood vessel. Thestrap guide 30 helps prevent thestrap 12 from becoming twisted or misaligned during the tightening operation. - If the optional counter-pull handle 76 is used, the user may pull this opposite to the pivoting movement of the
lever 16, either to make this step easier or to prevent unwanted movement of thetourniquet 10 relative to the limb L.FIG. 16 shows thelever 16 in the fully tightened position. - Once the
lever 16 has been pivotally actuated, it may be secured in the tightened position. For example,FIG. 17 shows thelock tab 58 connected to thestrap 12 using thereleasable fastener 60, engagingreleasable fasteners 22 of thestrap 12. This prevents thelever 16 from moving out of the tightened position. It is noted that thelever 16 has an over-center motion, and so only a small amount of force is required to hold it in the tightened position, even though thetourniquet 10 may be applying a very high clamping force. - Once the
tourniquet 10 has been applied and thelever 16 secured by thelock tab 58, the free end of thestrap 12 may be wrapped around the body of thetourniquet 10, covering thebaseplate 14,lever 16, and locktab 58, and secured to thelock tab 58, as shown inFIG. 18 . Thus secured, it performs a function of cutting off blood flow, with a very small exterior profile and no protruding exterior element that could protrude, catch on objects, or become dislodged from its locked position, limiting the user's mobility and possibly causing additional injury. - The
baseplate 14 may not be completely rigid and therefore will tend to bend in a convex shape, conforming to the curvature of the limb L, when thetourniquet 10 is applied. It is possible under some circumstances that the corners or edges of thebaseplate 14 might tend to cause pinching of the limb L. This possibility may be addressed with the use of a baseplate which is concave-curved in a resting state.FIG. 19 shows abaseplate 114 with this concave curvature. This may be substituted for thebaseplate 14 described above. Thus curved, the baseplate would be spaced away from the limb L and would not tend to pinch. When thetourniquet 10 is applied and tightened, thebaseplate 114 would tend to flatten out to a deflected shape is shown inFIG. 20 . As another option to address potential pinching, the center of baseplate may be flat, and the distal ends of the baseplate may be bent at an angle, curved, or otherwise displaced, in a direction towards thelever 16. These ends have a similar effect in preventing pinching to the curvature described above. This feature may be referred to as the distal ends being “ramped”.FIG. 21 shows abaseplate 214 with ramped ends 215. - Several of the features of the
tourniquet 10 described above can be integrated into the baseplate in order to simplify its construction. For example,FIG. 23 illustrates atourniquet 310 constructed using analternative baseplate 314 along with astrap 12 andlever 16 as described above. - The
baseplate 314 is a relatively thin, plate-like rigid or semirigid member. Nonlimiting examples of suitable material for thebaseplate 314 include plastics, wood, metals, and combinations thereof In the illustrated example, thebaseplate 14 is constructed as an injection-molded polymeric component with a generally rectangular plan view shape. It has first and second ends 332, 336, respectively, and these ends may be ramped as described above. - The
baseplate 314 includes astrap guide 330 in the form of a slot formed near thefirst end 332 of thebaseplate 314. Thefirst portion 17 of thestrap 12 is threaded through thestrap guide 330. - The
baseplate 314 includes anintegral lever anchor 334 between the first and second ends 332, 336. In the illustrated example, thelever anchor 334 comprises aresilient flange 338 formed integrally with the body of thebaseplate 314. - As used herein, the term “integral” refers to components which functionally and/or physically form part of a unitary or monolithic whole. For example, components which are machined from a single piece of material, formed as part of an additive manufacturing process, or formed as part of an injection molding process may be considered physically and functionally integral, unitary, or monolithic. As another example, separate components which are securely attached to each other by means such as fasteners, mechanical joints, thermal or sonic bonding, or adhesives, may be considered functionally integral, unitary, or monolithic.
- The
flange 338 is shaped so as to define atransverse channel 339 which captures thefirst pivot element 48 of thelever 16. Theflange 338 may be constructed so as to lie tightly against the surface of thebaseplate 314, and may include an upturned lead-infeature 340 at its distal end. This facilitates initial assembly, by permitting thelever 16 to be forced between theflange 338 and thebaseplate 314. Once the lever enters thechannel 339, theflange 338 snaps back into place against the surface of thebaseplate 314, and strongly resists removal of thelever 16. - In the illustrated example, a
resilient hook 362 is integrally formed as part of thebaseplate 314, positioned at or near thesecond end 336. Thehook 362 may be constructed so as to lie lightly against the surface of thebaseplate 314, and may include an upturned lead-infeature 364 at its distal end. - A
ring 365 with a generally rectangular shape and made of a rigid material such as metal or plastic is attached to thesecond portion 19 of thestrap 12. Thering 365 includes afirst slot 367 which is sized to fit thestrap 12 with a relatively “tight” (e.g., friction) fit. The exposed portion of thering 365, and asecond slot 369, are collectively sized to fit thehook 362. In the illustrated example, thestrap 12 is simply passed through thefirst slot 367. In use, the end of thering 365 can be engaged with the lead-infeature 364 and then pulled into full engagement with thehook 362. The spring tension inherent in thehook 362 is made sufficiently light that thering 365 can be easily removed if necessary. - Once the
ring 365 is engaged in thehook 362, thesecond portion 19 of thestrap 12 can be pulled to a desired position (i.e., adjusted), and then folded back and connected to the remainder of thestrap 12 using thereleasable connector 22. The combined structure of thehook 362 and thering 365 is another example of a “connector assembly”. - The
baseplate 314 may optionally incorporate a latch or other similar mechanism (not shown) similar to thelatch 59 described above. - The
baseplate 314 may incorporate aslot 337 at or near thesecond end 336. This is similar to theslots 40 described above, and may be used as an alternative to thehook 362 to connect thesecond portion 19 of thestrap 12, in the manner described above. - This version of the
baseplate 314 provides for simplified construction and lower parts count. The basic usage of thetourniquet 310 is substantially similar to that of thetourniquet 10 described above. - The tourniquet described above has numerous advantages over pre-existing tourniquets. For example, the tourniquet is of a lighter weight, is a more compact package for easier storage, is easily and more rapidly applied by a user, and has no protruding portions which could limit the users range of motion, become caught on objects and or become dislodged from its locked position rendering the device useless.
- The foregoing has described a tourniquet. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive.
- Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.
- The invention is not restricted to the details of the foregoing embodiment(s). The invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.
Claims (20)
1. A tourniquet, comprising:
a baseplate with first and second ends;
a strap having first and second ends, the strap having a first portion adjacent its first end, and a second portion adjacent its second end;
a lever with proximate and distal ends, wherein the proximate end is pivotally connected to the baseplate, and the distal end is free;
wherein the first end of the strap is pivotally connected to the lever intermediate to the proximal and distal ends; and
a connector assembly operable to selectively connect the second portion of the strap to the baseplate, so as to form a closed loop, the connector assembly operable to permit a length of the closed loop to be adjusted.
2. The tourniquet of claim 1 wherein the baseplate includes a strap guide, and the strap is engaged with the strap guide.
3. The tourniquet of claim 2 wherein the strap guide comprises a slot formed in the first end of the baseplate through which the first portion of the strap is threaded.
4. The tourniquet of claim 1 wherein the lever is movable between released and tightened positions, wherein a free length of the strap extending beyond the baseplate is shorter in the tightened position than in the released position.
5. The tourniquet of claim 1 wherein the second portion of the strap includes a releasable connector operable to selectively connect the second portion of the strap to the remainder of the strap.
6. The tourniquet of claim 1 wherein the connector assembly includes:
a slot formed in the baseplate sized to receive the strap; and
a releasable connector disposed on the strap and operable to selectively connect the second portion of the strap to the remainder of the strap.
7. The tourniquet of claim 1 further comprising a locking mechanism operable to secure the lever in the tightened position.
8. The tourniquet of claim 1 further comprising a latch carried on the baseplate operable to engage the lever in the tightened position.
9. The tourniquet of claim 1 further comprising a lock tab carried at the distal end of the lever.
10. The tourniquet of claim 9 wherein the lock tab includes a releasable connector operable to selectively connect the lock tab to the strap.
11. The tourniquet of claim 1 wherein the baseplate includes a lever anchor comprising a closed loop of flexible material which surrounds a pivot element of the lever.
12. The tourniquet of claim 1 wherein the baseplate includes a lever anchor comprising a rigid U-shaped element which surrounds a pivot element of the lever.
13. The tourniquet of claim 1 wherein the lever comprises a pair of spaced-apart side rails interconnected by a plurality of crossbars.
14. The tourniquet of claim 1 wherein the baseplate has a concave curvature.
15. The tourniquet of claim 1 wherein distal ends of the baseplate are ramped towards the lever.
16. The tourniquet of claim 1 wherein a finger hole is formed in the second end of the strap.
17. The tourniquet of claim 1 wherein the strap comprises a plurality of spaced-apart flat sections configured to facilitate cutting.
18. The tourniquet of claim 1 wherein a counter-pull handle is disposed at the first end of the baseplate.
19. The tourniquet of claim 1 wherein:
the baseplate includes an integral lever anchor disposed between the first and second ends of the baseplate, the lever anchor receiving the proximate end of the lever; and an integral resilient hook positioned at or near the second end of the baseplate; and
a ring sized to fit the hook is attached to the second portion of the strap.
20. The tourniquet of claim 19 wherein the lever anchor comprises a resilient flange shaped so as to define a transverse channel which captures a first pivot element of the lever.
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US17/355,306 US20210315589A1 (en) | 2018-03-07 | 2021-06-23 | Tourniquet with lever tensioning mechanism |
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Application Number | Priority Date | Filing Date | Title |
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US15/914,054 US10194917B1 (en) | 2018-03-07 | 2018-03-07 | Tourniquet with lever tensioning mechanism |
US16/225,835 US11090060B2 (en) | 2018-03-07 | 2018-12-19 | Tourniquet with lever tensioning mechanism |
US17/355,306 US20210315589A1 (en) | 2018-03-07 | 2021-06-23 | Tourniquet with lever tensioning mechanism |
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US16/225,835 Continuation US11090060B2 (en) | 2018-03-07 | 2018-12-19 | Tourniquet with lever tensioning mechanism |
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US20210315589A1 true US20210315589A1 (en) | 2021-10-14 |
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US16/225,835 Active 2038-08-03 US11090060B2 (en) | 2018-03-07 | 2018-12-19 | Tourniquet with lever tensioning mechanism |
US17/355,306 Abandoned US20210315589A1 (en) | 2018-03-07 | 2021-06-23 | Tourniquet with lever tensioning mechanism |
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US15/914,054 Active US10194917B1 (en) | 2018-03-07 | 2018-03-07 | Tourniquet with lever tensioning mechanism |
US16/225,835 Active 2038-08-03 US11090060B2 (en) | 2018-03-07 | 2018-12-19 | Tourniquet with lever tensioning mechanism |
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EP (1) | EP3761889A4 (en) |
JP (1) | JP7071765B2 (en) |
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Cited By (1)
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US11246602B2 (en) * | 2019-03-27 | 2022-02-15 | Samuel Slishman | Pressure wraps and methods of using pressure wraps |
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2018
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- 2018-12-19 US US16/225,835 patent/US11090060B2/en active Active
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US11246602B2 (en) * | 2019-03-27 | 2022-02-15 | Samuel Slishman | Pressure wraps and methods of using pressure wraps |
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US20190274693A1 (en) | 2019-09-12 |
JP2021516142A (en) | 2021-07-01 |
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WO2019172980A1 (en) | 2019-09-12 |
JP7071765B2 (en) | 2022-05-19 |
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US11090060B2 (en) | 2021-08-17 |
US10194917B1 (en) | 2019-02-05 |
IL277138B (en) | 2021-02-28 |
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