Medical rod bending pliers with double joint

Abstract

The present disclosure relates to medical rod bending pliers (1) with compressible handles (2) that can be pivoted about a first joint (6), and pivoting arms (4) that can be moved in opposite directions when the handles (2) are moved. Each pivoting arm (4) has a bending roller (10) that can be moved with the pivoting arm (4) and is prepared and designed to bend a rod, in particular a spinal implant, that is inserted into the rod bending pliers (1). The pivoting arms (4) are each movably connected to the respective handles (2) by a second joint (8).

Description

Technical background

[0001] The present disclosure relates to a medical rod bending pliers having a first joint between handles and pivot arms with bending rollers.

[0002] During spinal surgery, pedicle screws are screwed into individual vertebrae and connected to each other by a rod. This allows individual vertebrae that have slipped relative to other vertebrae, so-called slipped vertebrae, to be fixed in a desired position. The rod connecting the pedicle screws must be adapted to the shape of the patient's spine. It is common practice to use pliers to bend the rod. These pliers are also called rod bending pliers. Common rod bending pliers have two compressible handles (handle branches), two movable jaws with (rod) bending rollers at their free ends, and a joint / hinge between the pair of handles and the bending rollers. Each handle branch is firmly connected to the corresponding jaw, preferably in one piece (with fabric), and thus forms a pliers component.Both pliers components are not scissor-like, but rather connected via a hinge in a rocker-like manner. When the gripping jaws are pressed together, the two jaws pivot apart. The bending rollers follow a circular path toward the gripping jaws.

[0003] The bar bending pliers also have a central support surface (bending pin) located between the two bending rollers and in the direction of the joint / hinge. When the pair of handles is pressed together, the bending rollers pivot around the joint / hinge so that the bending rollers move apart and backwards towards the handles. When the bar rests against the central support surface, the bar is bent by the circular movement of the bending rollers around the contact surface. The bending radius of the bar depends on the geometry of the central support surface, whereas the bending angle (extent of the bending movement) is particularly dependent on the travel or radius of movement of the two bending rollers. This means that a large travel distance of the bending rollers results in a large bending angle. The bending radius in the area of ​​the bend (dependent on the contact surface) remains unaffected by the bending angle (angular dimension of the bend).

[0004] Since the two bending rollers are mechanically coupled to the handles via the jaws, a large travel path of the bending rollers also means a large opening angle for both handles. Due to the necessary large opening angle of the handles / handle branches, the rod bending pliers often have to be operated or held by a user or surgeon with two hands, similar to hedge trimmers. However, since the user has to hold the rod in addition to the rod bending pliers, in practice, a handle is placed on the user's chest as a counterweight, with one hand holding the rod and the other hand operating the other handle. This is not only unergonomic, but can also contaminate the rod bending pliers or make them unsterile. Summary of Revelation

[0005] It is the object of the present disclosure to overcome or at least mitigate the disadvantages of the prior art and, in particular, to provide a medical rod bending pliers that can be held and operated by a user with only one hand. In particular, the user should be able to grip both handles of the rod bending pliers with one hand.

[0006] According to the disclosure, this object is achieved by a (medical) rod bending pliers having the features of claim 1. Furthermore, the object of the present disclosure is achieved by a system having the features of claim 14 and a use having the features of claim 15.

[0007] The basic idea of ​​the disclosure essentially consists in designing the bar bending pliers as double-joint pliers and equipping them with a boom that is supported on the first joint / hinge (comparable to the rocker hinge of the prior art described above) of the double-joint mechanism and extends towards a scissor hinge / connecting pin (in the longitudinal direction of the pliers) to which the (boomerang-like bent) jaw parts are coupled to one another in a scissor-like manner. The central support surface, also known from the prior art, is formed or mounted / can be mounted on the boom. The boom is further formed with a guide slot, for example a longitudinal slot, which is provided and designed to guide the scissor hinge / connecting pin in the region of the jaw parts for longitudinal movement.

[0008] More specifically, the present disclosure relates to a medical rod bending pliers with - compressible handles or handle shanks, - (Boomerang-like curved) swivel arms / branches / jaws that can be moved in opposite directions when the handles are moved and - a first (pivoting) joint / hinge, on which the handles are arranged so as to pivot relative to one another in the manner of a rocker. This means that the first (pivoting) joint / hinge is arranged in a front end region of the handle branches, such that a comparatively short handle extension protrudes beyond the first (pivoting) joint / hinge toward the jaws. - Each swivel arm / jaw part has a (rod) bending roller at its free end section (facing away from the handle extensions), which is movable (together) with the respective swivel arm / jaw part and is prepared and designed to bend a rod (of a spinal implant / pedicle screw) that is inserted into the rod bending pliers. - The pivot arms / jaw parts are coupled together in their middle areas by means of a joint / connecting pin in a scissor-like manner and are hinged to the handle extensions at their ends / end sections facing the handle extensions by a second (pivot) joint / hinge.

[0009] In other words, the bar bending pliers have compressible handles (handle branches) or a compressible pair of handles that are pivotally arranged around the first joint / hinge of the double-joint mechanism in a seesaw-like manner (i.e., not scissor-like). Each handle branch has a (single-piece) handle extension that projects beyond the first joint / hinge toward the pliers' jaws. Therefore, when the handles are pressed together around the first joint of the double-joint mechanism, the free ends of the handle extensions move apart around the first joint. At each of the handle extensions, one of the two (boomerang-like) jaws is pivotally coupled via the second joint / hinge of the double-joint mechanism. The two jaws are scissor-like coupled in their respective longitudinal center sections via the scissor joint / connecting pin.

[0010] Therefore, squeezing the pair of handles together causes the handle extensions and the coupled ends of the jaws to move apart. This in turn causes a (circular) movement of the free ends of the jaws and thus of the bending rollers (as a result of the boomerang-like bend) towards the handle branches. This means that the first joint remains static (stationary) while the handles perform a relative movement / pivoting movement around the first joint. The movement of the handles allows the pivot arms / jaws, which are connected (movably / hinge-like) to the handles, to be moved. The connection between the pivot arms and the handles represents the second joint. The movement of the scissor-like coupled pivot arms / jaws simultaneously causes a movement of the bending rollers, which are attached to the pivot arms / jaws.The bending rollers thus move relative to the bar held at the contact surface and exert a bending force on both sides of the contact surface, resulting in a bar bending movement. The bending rollers can roll along the bar and plastically deform it through their circular path.

[0011] The rod bending pliers can, in particular, be medical pliers for bending rods for spinal implants. Bending allows the rod to be adapted to a patient's anatomical shape, particularly the patient's spine.

[0012] The first joint may have a first joint pin, which is rotatably mounted in a first joint bore on the respective handle. The second joint may have a second joint pin, which is mounted in a second joint bore on the respective handle and a further joint bore in the respective pivot arm.

[0013] The purpose of the disclosure is therefore to provide a (mechanical) transmission between the handles and the pivot arms / jaws with the bending rollers. This transmission can be achieved by designing the connection / coupling between the handles and the pivot arms as a double joint.

[0014] The bar bending pliers according to the disclosure have the following advantages: The double joint allows the travel of the swivel arms and thus the bending rollers to be decoupled from the travel of the handles and thus the opening angle of the handles. This means that the opening angle of the handles can be reduced without reducing the travel of the bending rollers. The handles can be positioned relative to each other in such a way that a user can grip both handles with one hand, even when the handles are at their maximum distance from each other. Despite the reduced opening angle, the desired travel of the bending rollers can be maintained and the desired bending radius of the bar can be ensured. The user can therefore hold and operate the bar bending pliers with one hand. This leaves the other hand free, for example to hold the bar to be bent. This ensures ergonomic and sterile working conditions for the user.

[0015] Advantageous further developments of the present disclosure are the subject of the appended subclaims.

[0016] According to an optional feature of the present disclosure, the bending roller can be arranged at a distal end portion of the respective pivoting arm. The pivoting arms can each have a proximal end portion, the distal end portion, and a central portion arranged between the proximal end portion and the distal end portion. The bending roller can, in particular, be rotatably arranged on the distal end portion and rotate about a rotation axis, which is preferably arranged perpendicular to a longitudinal extension of the rod bending pliers.

[0017] A distal direction can be defined as pointing towards the bending rollers and a proximal direction as pointing towards the handles.

[0018] Preferably, the pivot arms can be movably attached to one another or connected to one another. The pivot arms can be scissor-like, in particular, by a connecting pin / connecting pin / connecting bolt. For this purpose, the two pivot arms can cross in the central section. The two pivot arms can each have a central bore in which the connecting pin is mounted. The pivot arms are each rotatable or movably mounted about the connecting pin. The connecting pin can (movably) connect the two crossed central sections.

[0019] The pivot arms can be designed as a flat, elongated plate, wherein the central bore for the connecting pin can be arranged in the central section of the pivot arm. The pivot arms can also be curved so that they have the shape of a boomerang. The pivot arms can each have a proximal joint bore in the proximal end section, in which the joint pin of the second joint is mounted. The joint pin of the second joint can also be rotatably mounted in the second joint bore on the respective handle.

[0020] The movement of the pivot arms, and in particular the relative movement of the pivot arms to one another, can have two components. The pivot arms can each perform a rotational movement about the second joint, with which the respective pivot arm is attached to the handle. Furthermore, a connecting section in which the two pivot arms are attached to one another can perform a translational movement in the direction of a longitudinal extension of the bar bending pliers. This means that the connecting pin connecting the pivot arms can move axially along the longitudinal extension of the bar bending pliers.

[0021] The rotational movement of the pivoting arms can cause the distal end section and thus the bending rollers to move in a circular arc. When the rod is inserted into the rod bending pliers, the bending rollers can roll along the rod when the handles are actuated or pressed together. The movement along the circular arc, and thus the movement relative to the fixed rod, allows the bending rollers to bend the rod. The bending rollers can therefore preferably be prepared and configured to bend or plastically deform the rod of the spinal implant.

[0022] Advantageously, the connecting pin can be movably mounted in a guide groove. In particular, the connecting pin can be movable in the longitudinal direction of the bar bending pliers. The translational movement of the connecting pin can thus be guided by the guide groove. The connecting pin can, in particular, have a wide pin head that is mounted or guided in the guide groove. A longer pin cylinder of the connecting pin, which protrudes from the pin head, can be mounted in the central bores of the pivot arms. The guide groove can thus limit the (translational) movement of the connecting pin and thus of the pivot arms to one (translational) degree of freedom. The guided movement can bring about a symmetrical / uniform movement of the two pivot arms.

[0023] The guide groove can preferably be formed in a guide section / guide element / cantilever / support plate. The guide section can have a flat, plate-shaped base body. A bore can be formed on a proximal side of the plate-shaped base body, in which bore the first joint pin of the first joint is mounted. The guide section can therefore be mounted in a position-determined manner by the first joint. The elongated guide groove can be formed on a distal side of the plate-shaped base body. The depth of the guide groove can correspond to a thickness of the wide pin head of the connecting pin. The pin cylinder of the connecting pin can be guided in an elongated recess in the guide section. The plate-shaped base body can in particular have the shape of a fork or a wrench.

[0024] According to a further optional feature of the present disclosure, the bar bending pliers can have a deflector / a handwheel / an adjuster / an actuator / a setting device. The deflector can have a support surface or a bending surface, which can be prepared and configured to bear against the bar and bend the bar. Together with the two bending rollers, the support surface can thus form (at least) three support surfaces or points on which the bar can rest. The deflector can be arranged between the bending rollers, viewed in the width direction of the bar bending pliers. This means that the deflector can be arranged on an axis of symmetry / longitudinal axis of the bar bending pliers, while the bending rollers are each offset outwards from the longitudinal axis. Thus, the bar can be bent by the relative movement of the two bending rollers around the support surface of the deflector. The deflector can thus have the function of a deflection or support element.

[0025] The deflector can preferably be mounted on a receiving shaft of the guide section. The receiving shaft can be arranged on a guide section or protrude from the guide section. In particular, the receiving shaft can be designed as a cylindrical attachment that protrudes perpendicularly from the plate-shaped base body of the guide section. This means that the longitudinal axis of the receiving shaft can extend perpendicular to the longitudinal extent of the bar bending pliers. The receiving shaft can in particular be arranged centrally as seen in a longitudinal direction of the guide section. The guide section can thus represent a support or a support element for the deflector.

[0026] According to a further optional feature of the present disclosure, the deflector can be mounted rotatably about the receiving shaft. That is, the deflector can be rotatable about a rotation axis that corresponds to the longitudinal axis of the receiving shaft.

[0027] Preferably, the deflector can be designed such that the deflector is not rotationally symmetrical. In particular, depending on the orientation or direction of rotation, the deflector can form different support surfaces with differently sized contact areas or radii of curvature. The design of the support surfaces can influence the bending radius or a bending contour of the bar. In particular, a distance between the bending rollers and a vertex of the deflector's support surface, viewed in the longitudinal extension of the bar bending pliers, can influence the bending of the bar. Since the vertex can be varied by varying the curvature of the support surface, the bending of the bar can also depend on the curvature of the support surfaces.

[0028] Preferably, the deflector can be mounted so as to be axially movable along the receiving shaft or displaceable in the axial direction of the receiving shaft. This means that the deflector can be moved perpendicular to the longitudinal extent of the bar bending pliers. Thus, the deflector can have a total of two degrees of freedom, namely a translational and a rotational degree of freedom. By moving along the receiving shaft, the deflector can be lifted off the guide section. By simultaneously lifting and rotating the deflector, particularly by the user, the deflector can be rotated into different positions.

[0029] The deflector can, in particular, be designed as a round rotary knob. The deflector can be configured such that an edge or gripping portion of the deflector is graspable by the user. The user can thus rotate the deflector both around the rotation axis and move it along the receiving shaft.

[0030] According to a further optional feature of the present disclosure, a spring may be provided between the deflector and the receiving shaft, the spring force of which acts in the axial direction of the receiving shaft. The spring may preferably be attached to a projection of the receiving shaft. When the user pulls or lifts the deflector away from the guide section, the spring is compressed. When the user releases the deflector, it is pushed back toward the guide section by the spring force. The spring may, for example, be a coil spring.

[0031] The overhang of the receiving shaft can be caused, in particular, by a protruding cap / shaft end bolt on the shaft or a (protruding) shaft end. The overhang can also prevent the deflector from deflecting away from the receiving shaft.

[0032] Preferably, the guide section can have a protruding pin that engages in corresponding (locking) receptacles of the diverter depending on the orientation of the diverter. The diverter can preferably have three receptacles. This allows the diverter to be locked or secured in three different orientations. In each of the different orientations, a different support surface can point in the distal direction, i.e., in the direction of the bending rollers. The protruding pin can preferably be formed next to the receiving shaft.

[0033] The receptacles on the deflector can be formed in particular in a contact surface of the deflector with which the deflector rests on the guide section.

[0034] Furthermore, the diverter can be rotated into a cleaning position. In the cleaning position, the pin can rest on the support surface of the diverter such that the pin separates the diverter from the guide section. This means that the user can lift the diverter from the guide section and rotate the diverter about the rotation axis until the pin rests on the support surface. Thus, in the cleaning position, the diverter can be spaced from the guide section. This allows a cleaning fluid to penetrate into the space between the diverter and the guide section and clean and / or disinfect the space.

[0035] Advantageously, the spring can be positioned on an outer side of the receiving shaft. This allows the spring to be accessible to the cleaning fluid.

[0036] Preferably, the deflector can have recesses / holes in one side wall. The recesses allow the cleaning fluid to penetrate into the interior of the deflector and reach the receiving shaft and / or the spring.

[0037] The object of the present disclosure is further achieved by a system comprising the rod for the spinal implant and the rod bending pliers according to one of the preceding aspects. Short description of the characters Fig. 1 shows a perspective view of a bar bending pliers according to the present disclosure; Fig. 2 shows a bottom view of the bar bending pliers according to the present disclosure; Fig. 3 shows a plan view of a pivot arm of the bar bending pliers according to the present disclosure; Fig. 4 shows a plan view of the bar bending pliers according to the present disclosure; Fig. 5 shows a perspective view of a guide portion of the bar bending pliers according to the present disclosure; Fig. 6 shows a side view of a connecting pin of the bar bending pliers according to the present disclosure; Fig. 7 shows a perspective view of a knob of the bar bending pliers according to the present disclosure; Fig. 8 shows a longitudinal section through the rotary knob in Fig. 7; Fig. 9 shows a schematic view of a spring of the bar bending pliers according to the present disclosure; and Fig. 10 shows a perspective view of a handle of the bar bending pliers according to the present disclosure. Detailed description of the characters

[0038] Fig. 1 shows a rod bending pliers 1. The rod bending pliers 1 have two compressible handles 2 and two pivoting arms 4. The handles 2 can be pivoted relative to one another about a first (pivoting) joint 6. The pivoting arms 4 are each movably connected to the respective handles 2 by a second (pivoting) joint 8. The pivoting arms 4 each have a bending roller 10. The bending rollers 10 can each be rotated about an axis of rotation that is oriented perpendicular to a longitudinal extent of the rod bending pliers 1. This allows the bending rollers 10 to roll on a rod (not shown) during movement. In the following, distal is defined as pointing towards the bending rollers 10 and proximal as pointing in the direction of the handles 2.

[0039] Fig. 2 shows an underside of the bar bending pliers 1. The first joint 6 has a first joint pin 12, which is mounted in a first joint bore 14 of the respective handle 2. The second joint 8 connects a handle 2 to one of the pivot arms 4 and has a second joint pin 16. The second joint pin 16 is mounted in a second joint bore 18 in the handle 2 and a proximal joint bore 20 in the pivot arm 4. The two pivot arms 4 cross each other and are pivotally or rotatably connected to one another in a connecting section by a connecting pin 22. The connecting pin 22 is pivotally or rotatably mounted in a central bore 24 in a central section 26 of the pivot arms 4.

[0040] Fig. 3 shows a top view of one of the pivot arms 4. The pivot arms 4 each have a proximal end section 28 and a distal end section 30. The proximal joint bore 20, in which the second joint pin 16 of the second joint 8 is mounted, is provided in the proximal end section 28. The bending roller 10 is arranged or rotatably mounted in the distal end section 30. The central bore 24 is formed in the central section 26 of the pivot arm 4, which is arranged between the proximal end section 28 and the distal end section 30.

[0041] Fig. 4 shows a top view of the bar bending pliers 1. The bar bending pliers 1 further comprise a support (plate) or an extension / guide section 34. The extension / guide section 34 essentially has a flat, plate-shaped base body 36. On a proximal side of the plate-shaped base body 36, a bore 38 is provided, in which the first joint pin 12 of the first joint 6 is mounted. The guide section 34 is thus fixed to the first joint 6. On a distal side of the plate-shaped base body 36, the guide section 34 has an elongated guide groove 40. The connecting pin 22, which movably connects the two pivot arms 4, is axially guided in the guide groove 40. A receiving shaft 42 also protrudes from the plate-shaped base body 36 of the guide section 34. A deflector / rotary knob 44 is arranged on the receiving shaft 42.The rotary knob 44 is rotatable about the receiving shaft 42 and is mounted so as to be displaceable in the axial direction of the receiving shaft 42.

[0042] The operation of the rod bending pliers 1 is described below. When a user presses the two handles 2 together, the handles 2 pivot about the first joint 6 with the first pivot pin 12. This causes the second joints 8 with the second pivot pins 16, which are arranged at the distal end of the handles 2, to move outwards, i.e. away from a symmetry or longitudinal axis of the rod bending pliers 1. The outward movement of the second joints 8 causes the pivot arms 4 to pivot. The proximal end section 28 of the pivot arm 4 pivots outwards with the second joint 8. The connecting pin 22 between the two pivot arms 4 performs a translational movement along the longitudinal extent of the rod bending pliers 1. The distal end section 30 and thus the bending rollers 10 move on a circular path. The circular movement of the bending rollers 10 allows the rod to be bent, which rests against the rotary knob 44 and the two bending rollers 10.The bending of the bar depends particularly on the travel path of the bending rollers 10 on the circular path. The first joint 6 and the second joint 8 implement a transmission between an opening angle / travel path of the handles 2 and the travel path of the bending rollers 10.

[0043] Fig. 5 shows a perspective view of the guide section 34 with the plate-shaped base body 36. The receiving shaft 42, which is designed as a cylindrical projection, protrudes from the plate-shaped base body 36. The guide section 34 has the bore 38 in which the first pivot pin 12 is mounted. The receiving shaft 42 is arranged centrally in the longitudinal direction of the base body 36 and, like the bore 38, thus lies in an axis of symmetry of the base body 36. The guide section 34 also has a protruding pin 50. The protruding pin 50 is positioned next to the receiving shaft 42. The receiving shaft 42 has an axial shaft bore 52. A shaft end bolt 46 can be inserted into the shaft bore 52. The shaft end bolt 46 can protrude beyond a diameter of the receiving shaft 42. The guide groove 40 has an elongated recess 48.The guide groove 40 is thus configured such that a pin head 54 of the connecting pin 22 is axially guided in the guide groove 40. A pin cylinder 56, which protrudes from the pin head 54, has a smaller diameter than the pin head 54. The pin cylinder 56 protrudes through the elongated recess 48 and is axially guided therein. Thus, the first joint 6 has a translational degree of freedom in the longitudinal direction of the bar bending pliers 1 through the guide groove 40. This translational degree of freedom causes a symmetrical movement of the two pivot arms 4. Fig. 6 shows the connecting pin 22 with the pin head 54, which has a larger diameter than the pin cylinder 56.

[0044] The Fig. 7 and Fig. 8 shows the rotary knob 44. The rotary knob 44 is essentially round and rotatable about the receiving shaft 42. The rotary knob 44 has a contact surface 58 that rests against the guide section 34. (Locking) receptacles 60 are formed in the contact surface 58, which are suitable or designed to receive the pin 50. When the pin 50 engages in the receptacle 60, the rotatable rotary knob 44 is latched or locked in this position. A side wall of the rotary knob 44 forms different support surfaces 62 depending on the direction of rotation. This means that the rotary knob 44 is not rotationally symmetrical, but the contours of the individual support surfaces 62 differ. Depending on the position, a different geometry can point in the direction of the bending rollers 10. The support surfaces 62 are suitable for the bar (not shown) to rest against them and to be bent by the combination of bending rollers 10 and support surface 62.The rotary knob 44 further includes an edge 64 that the user can grasp. This allows the user to rotate the rotary knob 44 about the rotation axis and also move it along the receiving shaft 42. The rotary knob 44 can thus be lifted off the guide section 34 in the axial direction of the receiving shaft 42. By combining lifting the rotary knob 44 and simultaneous rotation about the receiving shaft 42, the rotary knob 44 can be rotated or adjusted to different positions. The different settings of the rotary knob 44 can vary the bending behavior or bending radius of the rod.

[0045] When the rotary knob 44 is lifted and rotated such that the pin 50 does not engage in a receptacle 60, but rests on the contact surface 58, the contact surface 58 is spaced from the base body 36 of the guide section 34. This position is referred to as the cleaning position. The distance between the contact surface 58 and the base body 36 allows cleaning fluid to penetrate between the respective surfaces.

[0046] The rotary knob 44 is preloaded with a spring 64. The spring 64 is in the Fig. 9 and is attached to one edge of the rotary knob 44. The other side of the spring 64 is attached to the shaft end bolt 46. The spring 64 runs along an outer side of the receiving shaft 42. Thus, a spring force of the spring 64 acts in the direction of the receiving shaft 42. When the rotary knob 44 is lifted (by the user) from the guide section 34, the spring 64 is compressed. When the external force on the rotary knob 44 is removed, the rotary knob is pushed back towards the guide section 34 by the spring force. This additionally ensures that the rotary knob 44 engages in the various locking positions. The rotary knob 44 also has recesses / holes 66 in the side wall. This allows cleaning fluid to penetrate particularly well to the receiving shaft 42 and the spring 64. Fig. 10 shows a handle 2 with a first joint bore 14 and a second joint bore 18 for the second joint 8. List of reference symbols 1 bar bending pliers 2 handle 4 swivel arm 6 first joint 8 second joint 10 bending roller 12 first hinge pin 14 first joint hole 16 second hinge pin 18 second joint hole 20 proximal joint hole 22 connecting pin 24 middle hole 26 Middle section 28 proximal end section 30 distal end section 34 Boom / Guide section 36 basic bodies 38 bore 40 guide groove 42 receiving shaft 44 Deflector / rotary knob 46 shaft end bolts 48 elongated recess 50 cones 52 shaft bore 54 pin head 56 pin cylinders 58 contact surface 60 recordings 62 contact surface 64 spring 66 recess

Claims

[1] Medical rod bending pliers (1) with compressible handles (2) which are arranged to pivot about a first joint (6), and pivoting arms (4) which are movable in opposite directions when the handles (2) are moved, wherein each pivoting arm (4) has a bending roller (10) which is movable with the pivoting arm (4) and is prepared and designed to bend a rod, in particular of a spinal implant, which is inserted into the rod bending pliers (1), characterized by that the swivel arms (4) are each movably connected to the respective handles (2) by a second joint (8). [2] Bar bending pliers (1) according to claim 1, characterized by that the bending rollers (10) are each arranged on a distal end section (30) of the pivot arm (4), in particular rotatable about a rotation axis. [3] Bar bending pliers (1) according to claim 1 or 2, characterized bythat the pivot arms (4) are movably attached to one another, in particular by a connecting pin (22) which is mounted in a bore (24) of the pivot arms (4). [4] Bar bending pliers (1) according to one of claims 1 to 3, characterized by that the connecting pin (22) is movably mounted in a guide groove (40) such that the connecting pin (22) has a degree of freedom in the direction of a longitudinal extension of the bar bending pliers (1). [5] Bar bending pliers (1) according to claim 4, characterized by that the guide groove (40) is formed in a guide section (34) of the bar bending pliers (1). [6] Bar bending pliers (1) according to one of claims 1 to 5, characterized by a deflector (44) having a support surface (62) which is prepared and arranged so that the rod rests against the support surface (62) and is bendable at the support surface (62). [7] Bar bending pliers (1) according to claim 6, characterized bythat the deflector (44) is mounted, in particular movably, on a receiving shaft (42) of the guide section (34). [8] Bar bending pliers (1) according to claim 7, characterized by that the deflector (44) is rotatably mounted around the receiving shaft (42). [9] Bar bending pliers (1) according to claim 8, characterized by that the deflector (44) is not rotationally symmetrical and forms different support surfaces (62) depending on the direction of rotation, which preferably define a radius of a bar bend. [10] Bar bending pliers (1) according to one of claims 7 to 9, characterized by that the deflector (44) is mounted axially movable along the receiving shaft (42). [11] Bar bending pliers (1) according to claim 10, characterized by that a spring (64) is provided between the deflector (44) and the receiving shaft (42), the spring force of which acts in the axial direction of the receiving shaft (42). [12] Bar bending pliers (1) according to claim 11, characterized bythat the spring (64) is fastened to a projection, in particular to a projecting shaft end bolt (46), of the receiving shaft (42). [13] Bar bending pliers (1) according to one of claims 6 to 12, characterized by that the guide section (34) has a projecting pin (50) which, depending on an orientation of the deflector (44), engages in corresponding receptacles (60) of the deflector (44) and spaces the deflector (44) from the guide section (34) in a cleaning position. [14] Bar bending pliers (1) according to characterized by that the deflector (44) has recesses (66) in a side wall of the deflector (44). [15] System comprising a rod of a spinal implant and a medical rod bending pliers (1) according to one of claims 1 to 14.

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