Spring arm device and support arm system for holding a medical appliance

Abstract

The present invention relates to a spring arm device (1) for a support arm system (100) for holding a medical appliance, comprising a spring tube (3) and a spring rod (4) arranged at least partially in the interior of the spring tube (3) and movable relative to the spring tube (3) in the longitudinal direction (2) of the spring tube (3). The spring arm device is further characterized by a clamping unit (30). For releasably applying a clamping force to the spring rod (4), the clamping unit is arranged on the spring tube (3) in a fixed position as viewed in the longitudinal direction (2). Also disclosed is a support arm system (100) for holding at least one medical appliance, comprising at least one spring arm device (1).

Description

[0001] Spring arm device and support arm system for holding a medical device

[0002] Technical area

[0003] The present invention relates to a spring arm device for a support arm system for holding a medical device and a support arm system for holding a medical device.

[0004] State of the art

[0005] Support arm systems are used, for example, in operating rooms for the locally relocatable support of a medical device or piece of equipment. For example, a support arm can be movably anchored to a ceiling, wall, or floor using a bearing arrangement. Mounting on a frame with casters is also possible. A support arm system designed to support medical devices can also be referred to as a medical support system. Support arm systems typically have at least one axis of movement so that the supported medical device, which can also be referred to as a medical device and may include, for example, an operating lamp, a monitor, examination equipment, one or more injectors, surgical instruments, or dental drills, can be moved according to specific requirements.The mounting that enables movement can also be referred to as an articulated device or support arm articulated device, whereby this can also include a support arm. This allows the medical device to be moved into a comfortable and safe position for carrying out the respective medical procedures and monitoring. The local relocation of medical devices is essential in many medical procedures in order to make the work easier for medical personnel or to make it possible at all. However, by pivoting a support arm, a lever arm relating to its mounting can be changed. In particular, when the support arm is pivoted about an essentially horizontal axis, which allows the height of the medical device held on it to be changed, a lever arm of the weight of the medical device is changed compared to the attachment or mounting of the support arm.Nevertheless, it is desired that the medical device remains in a position set by pivoting the support arm and that an adjustment of the position of the medical device, in particular against the force of gravity, should be possible without excessive effort by an operator.

[0006] For this purpose, spring-balanced support arms, referred to here as spring arms or spring arm devices, are often used. These consist of two arm elements that can be moved relative to one another and support each other via a spring. By pivoting the spring arm, the lever arm of the spring force changes in accordance with the lever arm of the load, allowing the medical device to be held equally well in different positions. Alternatively or additionally, the spring can also be compressed or stretched by pivoting, which also allows a corresponding support force to be changed.

[0007] Such support arm joint devices or spring arm devices can be found, for example, in WO 2016 / 074787 A1 or EP 3 861 958 A1.

[0008] Description of the invention

[0009] Based on the known prior art, it is an object of the present invention to provide an improved spring arm device for a support arm system for holding a medical device, as well as a corresponding support arm system for holding a medical device. In particular, the aim is to enable a cost-effective and easy way to permanently hold medical devices in a predetermined position.

[0010] The object is achieved by a device for a support arm system for holding a medical device having the features of claim 1. Advantageous further developments emerge from the subclaims, the description, and the figures.

[0011] Accordingly, a spring arm device for a support arm system for holding a medical device is proposed, comprising a spring tube and a spring rod arranged at least partially inside the spring tube and displaceable in the longitudinal direction of the spring tube relative to the spring tube.

[0012] The spring arm device further comprises a clamping unit for releasably applying a clamping force to the spring rod, which is arranged on the spring tube in a stationary manner with respect to the longitudinal direction of the spring tube. By applying the clamping force via the clamping unit, displacement of the spring rod relative to the clamping unit in the longitudinal direction and accordingly to the spring tube fixedly connected to the clamping unit can be prevented. In other words, the clamping unit can lock the spring rod relative to the spring tube. When the clamping unit is in a state in which the clamping force is applied, the spring rod is fixed in a fixed position relative to the spring tube. This means, in particular, that in the clamped state, the spring rod is locked relative to the spring tube against displacement along the longitudinal direction in both directions.

[0013] If the clamping unit is in the released state, in which the clamping unit does not exert any clamping force on the spring rod, the spring rod can be moved relative to the spring tube.

[0014] In particular, the clamping unit allows for continuous locking of the position of the spring rod relative to the spring tube. For example, in contrast to conventional devices with a predetermined number of spaced-apart, fixed locking positions, the clamping force can be applied to essentially any position of the spring rod relative to the spring tube via the proposed clamping unit, thus fixing the spring arm in essentially any position. The continuous locking is provided at least over a predetermined range of movement of the spring tube relative to the spring tube in the longitudinal direction of the spring tube, in other words, in the direction of the longitudinal axis of the spring tube.

[0015] Accordingly, the present spring arm device enables a precise and secure holding of a spring arm of a support arm system in a fixed position, wherein the spring arm device simultaneously has a comparatively simple structure.

[0016] The possibility of fixing (i.e. locking) the spring arm device in a predetermined fixed position can be particularly advantageous in applications in which the load on the support arm system comprising the spring arm device changes.

[0017] For example, when holding a medical injector, the suspended load held by a spring arm or spring arm device can be reduced over time due to the emptying of fluid from the injector. Due to this reduction, the preload acting on the spring arm by a preload element of the spring arm device and the load can no longer be balanced. As a result, the spring arm could shift from its intended position and thereby move the injector upwards. The proposed clamping unit can fix the position of the spring arm or spring arm device so that the injector is always held in the intended position and a patient can be treated safely.Analogous to the above, medical devices designed as documentation terminals, to which a monitor with a keyboard is connected, may experience a temporary increase in the load-bearing capacity if an additional operating force caused by typing on the keyboard is introduced into the support arm system. The solution according to the invention allows the spring arm device to be locked in a predetermined fixed position and prevented from lowering due to the applied operating force.

[0018] Furthermore, by locking the spring arm device by applying the clamping force through the clamping unit, it is possible to reduce or even completely prevent any migration or drifting of the spring arm device, or more precisely, a vibration-induced continuous or discontinuous displacement of the spring rod relative to the spring tube, due to vibrations occurring during operation of the medical device held by the support arm system.

[0019] The basic structure of a spring arm device can also be found in WO 2016 / 074787 A1 , in particular page 14, line 14 to page 20, line 20, and EP 3 861 958 A1 , in particular paragraphs 48 to 59, which are incorporated herein by reference.

[0020] The clamping unit is preferably designed such that by applying the clamping force to the spring rod, the spring rod is locked in its position relative to the spring tube.

[0021] The clamping unit preferably has a contact surface for applying the clamping force to an outer circumferential section of the spring rod, wherein the clamping unit is preferably designed such that, when the clamping force is applied, the contact surface is pressed against the outer circumferential section with a predetermined contact force. This makes it possible to achieve particularly secure clamping of a predetermined height. By providing the surface pressure via the contact surface, the required clamping force can be reproducibly transmitted to the spring rod without excessive local pressure occurring on the spring rod, which could otherwise damage the material of the spring rod. The clamping force can therefore be transmitted in a longitudinally distributed manner over the length of the contact surface. The contact surface can be a substantially cylindrical surface whose longitudinal axis extends in the longitudinal direction.

[0022] According to one embodiment, the clamping unit can comprise at least one clamping piece, preferably at least one clamping jaw, and / or a clamping ring, wherein the at least one clamping piece and / or the clamping ring preferably comprises the contact surface.

[0023] The clamping ring preferably comprises an annular base body with at least one radially extending slot. In other words, the clamping ring is a ring segment with opposing free ends that define the width of the slot in the circumferential direction of the ring segment. The opposing free ends are preferably spaced apart by a predetermined distance in an unloaded state.

[0024] The radial inner surface of the clamping ring represents the contact surface. If the free ends of the clamping ring are pressed towards each other from the unclamped state, the pitch circle diameter on which the radial inner surface is located decreases accordingly, so that the spring rod guided by the clamping ring can be clamped.

[0025] The clamping unit preferably comprises a manually operable actuating unit for applying and releasing the clamping force. This preferably comprises a clamping lever or an eccentric lever. This allows a person using or operating the spring arm device to easily manually adjust and release the locking of the movement of the spring rod and thus of the spring arm device.

[0026] Alternatively or additionally, the actuating unit may comprise a manually operable handle, preferably a lever handle, a screw handle or a star handle.

[0027] According to an optional embodiment, the clamping unit is held stationary relative to the spring tube by the actuating unit. In other words, the actuating unit can be designed to engage with the spring tube and the spring rod in such a way that the clamping unit is prevented from moving longitudinally relative to the spring tube. This eliminates the need for a separate attachment of the clamping unit to the spring tube, for example, screwing the clamping unit to the spring tube. In other words, the actuating unit is held stationary on the spring tube, and the actuating unit holds the clamping unit in the predetermined position in relation to the longitudinal direction. Forces in the longitudinal direction are thus transmitted from the clamping unit via the actuating unit to the spring tube. The actuating unit therefore also assumes the function of a fastening means for the clamping unit.According to this optional embodiment, the actuating unit, or a component of the actuating unit, can be supported in a receptacle provided on the spring tube, for example in the form of a receiving bore. The receiving bore can extend transversely to the longitudinal direction, for example, skewed, i.e., without intersecting the center axis of the spring tube and / or the center axis of the spring rod. The clamping unit is thus positioned relative to the spring tube by the actuating unit, i.e., held stationary on the spring tube.

[0028] For example, the actuating unit can comprise or be designed as a clamping lever comprising a threaded bolt and a handle, such as a lever handle, attached to one end. At the other end, the threaded bolt can be screwed into a thread formed in the clamping unit, for example, in a clamping ring of the clamping unit.

[0029] The threaded bolt can also be guided through the spring tube in a receiving bore provided in the spring tube. This allows the threaded bolt to be fixed in its position relative to the spring tube and to be held in the receiving bore only in the axial direction and rotatable about the axial direction of the receiving bore. Since the threaded bolt is also screwed to the clamping unit, the clamping unit is then held stationary relative to the spring tube in the longitudinal direction.

[0030] According to an optional embodiment, the spring rod comprises a threaded rod which has a thread at least in one section. The spring rod, preferably its threaded rod, can have a cylindrical surface section providing the outer peripheral section. Alternatively or additionally, the spring rod can also comprise a sleeve, which is preferably screwed onto a thread of the threaded rod and which provides the outer peripheral section. Preferably, the sleeve is arranged in a rotationally fixed manner on the spring rod, preferably on the threaded rod, wherein the sleeve is preferably fixed in its position relative to the spring rod, preferably to the threaded rod, by means of a securing element, preferably a securing ring, a securing pin or a securing screw. Alternatively or additionally, the sleeve can be pressed onto the spring rod or the spring rod, preferably the threaded rod.Alternatively or additionally, the threaded rod and the sleeve can be screwed together in a clamped state. Furthermore, alternatively or additionally, the screw connection between the threaded rod and the sleeve can be self-locking.

[0031] The outer peripheral portion may further be a portion of a thread of the threaded rod.

[0032] The outer peripheral section is advantageously designed to correspond to the contact surface of the clamping unit.

[0033] The clamping unit, advantageously comprising a clamping ring, can be switched, for example, via the actuating unit, between a released state and a state in which the clamping force is applied. In the released state, sliding of the outer peripheral portion relative to the contact surface and thus displacement of the spring rod relative to the spring tube is possible. This can be made possible, for example, by ensuring that, in the released state, an inner radius of the clamping unit, advantageously the clamping ring, defined by the contact surface, is larger than an outer radius of the outer peripheral portion.

[0034] The outer peripheral section advantageously has a predetermined length in the longitudinal direction. The spring rod can be displaced relative to the clamping unit along the length of the outer peripheral section, and the clamping force can be continuously applied by the clamping unit at any point along the outer peripheral section.

[0035] The clamping unit is advantageously arranged circumferentially around the spring rod and / or radially outwardly around the spring rod relative to the longitudinal direction. In other words, the clamping unit or parts thereof do not penetrate the spring rod in a direction transverse to the longitudinal direction, which would otherwise weaken the spring rod's load-bearing capacity and also increase manufacturing costs.

[0036] The spring rod is advantageously designed to be continuous in the area of ​​the clamping unit and / or in the area of ​​the outer peripheral section.

[0037] The threaded rod is advantageously formed as a single piece and / or is continuous. In other words, the threaded rod is advantageously not multi-part and segmented. Accordingly, no connections between the segments are required.

[0038] The spring rod is preferably mounted translationally, preferably slidingly, in the spring tube, wherein the spring rod preferably comprises at least one slide that is mounted translationally, preferably slidingly, relative to the spring tube. Preferably, the spring rod comprises, on a first side, a first slide that is mounted translationally relative to the spring tube, and, on a second side, a second slide that is mounted translationally relative to the spring tube.

[0039] According to a preferred, i.e. optional, embodiment, the spring tube is arranged on a first fastening unit on a first side so as to be rotatable about a first axis of rotation, and the spring rod is connected to a lever element on the first side so as to be rotatable about a second axis of rotation, preferably oriented parallel to the first axis of rotation. The lever element is preferably arranged on its side opposite the spring rod—spaced from the first axis of rotation—so as to be rotatable about a third axis of rotation, preferably oriented parallel to the first axis of rotation. Accordingly, a spring arm mechanism can be provided.

[0040] In order to apply a preload to the spring rod, a spring element, preferably a compression spring, can be provided in the spring tube for preloading the spring rod relative to the spring tube, wherein the spring element is preferably supported at one end on the spring tube, preferably on a shoulder provided in the spring tube, preferably comprising an indentation on the spring tube, and is supported at another end on the spring rod, preferably on a shoulder provided on the spring rod.

[0041] According to a preferred embodiment, the contact surface and / or the outer peripheral portion at least partially comprise a coating, preferably a brake pad layer, which increases the coefficient of friction between the contact surface and the outer peripheral portion compared to a material pairing of the base materials of the part comprising the contact surface and the part comprising the outer peripheral portion.

[0042] The above-mentioned object is further achieved by a support arm system for holding at least one medical device having the features of claim 11. Advantageous further developments emerge from the present description and the figures.

[0043] Accordingly, a support arm system for holding at least one medical device is proposed, which comprises at least one spring arm device according to one of the preceding embodiments.

[0044] The advantages and effects described with regard to the spring arm device are also achieved by the support arm system, which is why they will not be described repeatedly here to avoid redundancies.

[0045] Short description of the characters

[0046] Preferred further embodiments of the invention are explained in more detail in the following description of the figures. In the figures:

[0047] Figure 1 shows schematically a support arm system with a spring arm device;

[0048] Figure 2 schematically shows a perspective side view of a partial area on a second side of the spring arm device from Figure 1;

[0049] Figure 3 schematically shows a perspective sectional view through the spring arm device of Figures 1 and 2 at the level of a clamping unit transverse to a longitudinal direction; and

[0050] Figure 4 schematically shows a perspective sectional view in the longitudinal direction through a partial area of ​​the spring arm device from Figures 1 to 3.

[0051] Detailed description of preferred embodiments

[0052] Preferred embodiments are described below with reference to the figures. Identical, similar, or equivalent elements in the different figures are provided with identical reference numerals, and a repeated description of these elements is partially omitted to avoid redundancies.

[0053] Figure 1 schematically shows a support arm system 100 with a spring arm device 1. The support arm system 100 is designed to hold a medical device (not shown). The spring arm device 1 comprises a spring tube 3 extending in a longitudinal direction 2. Arranged inside the spring tube 3 is a spring rod 4 that is displaceable in the longitudinal direction 2 relative to the spring tube 3.

[0054] The spring rod 4 has a threaded rod 5 extending in the longitudinal direction 2, which is attached on a first side to a first slide 6 mounted in a translationally sliding manner relative to the spring tube 3, in this case screwed in, and is connected on a second side to a second slide 7 mounted in a translationally sliding manner relative to the spring tube 3. In this case, the second slide comprises a threaded bushing 9 with a shoulder 10, onto which a sliding ring 11 is pushed.

[0055] The sliding ring 11 is also designed as a stop on the second side for a spring element 12, here designed as a compression spring, for preloading the spring rod 4 relative to the spring tube 3. The spring element 12 is supported on the first side on an indentation 13 in the spring tube 3. The distance in the longitudinal direction 2 between the sliding ring 11 serving as the first stop on the second side and the indentation 13 serving as the second stop on the first side is smaller than a zero length of the spring element 12, which the spring element 12 has in a relaxed state. The spring element 12 is therefore preloaded. The level of preload of the spring element 12 can be changed by changing the position of the second stop relative to the threaded rod 5 in the longitudinal direction 2. For this purpose, the threaded bushing 9 can be rotated relative to the threaded rod 5.According to the present, optional embodiment of the spring arm device 1, the screw connection between the threaded bushing 9 and the threaded rod 5 is self-locking. Alternatively, the threaded bushing can also be secured in its position relative to the threaded rod 5 by an optional locking element (not shown).

[0056] The spring tube 3 is arranged on the first side on a first fastening unit 14 so as to be rotatable about a first axis of rotation 21. Furthermore, the spring rod 4 is connected to the first fastening unit 14 via a lever element 15. More precisely, the spring rod 4 is connected to the lever element 15 on the first side so as to be rotatable about a second axis of rotation 22 oriented parallel to the first axis of rotation 21, and the lever element 15 is arranged on its side opposite the spring rod 4 so as to be rotatable about a third axis of rotation 23 oriented parallel to the first axis of rotation 21 and spaced from the first axis of rotation 21 on the first fastening unit 14.

[0057] Accordingly, the preloaded spring element 12 provides a preload for the spring tube 3, wherein the preload counteracts a weight force acting on the spring tube 3. On the second side, the spring tube 3 is rotatably mounted on a second fastening unit 16 via a fourth rotational axis 24 oriented parallel to the first rotational axis 21.

[0058] The spring arm device 1 further comprises a pull-push rod 17, which is rotatably arranged on the first fastening unit 14 via a fifth rotation axis 25 oriented parallel to the first rotation axis 21 and is rotatably arranged on the second fastening unit 16 via a sixth rotation axis 26 oriented parallel to the fourth rotation axis 24.

[0059] Accordingly, the spring arm device forms a joint device which provides parallel guidance of the second fastening unit 16 relative to the first fastening unit 14.

[0060] A medical device (not shown) or another spring arm device can be attached to the second fastening unit 16, wherein the second fastening unit 16 then represents the first fastening unit of this further spring arm device.

[0061] Because the lever element 15 and the spring tube 3 are mounted at a distance from one another on the first fastening element or unit 14, a different lever arm or angle results depending on the angular position of the spring tube 3 around the first rotation axis 21, by means of which the lever element 15 supports the spring tube 3 via the spring rod 4 and the spring element 12. Thus, with different positions of the spring arm device 1 or the spring tube 3, a similar or even essentially the same weight force can be supported equally.

[0062] The combination of spring tube 3, spring arm 4 and spring element 12 can be understood as a balanced spring arm.

[0063] Further details on the design of the spring arm device or the spring arm can be found in WO 2016 / 074787 A1 , in particular page 14, line 14 to page 20, line 20, and EP 3 861 958 A1 , in particular paragraphs 48 to 59, to the content of which reference is made again at this point.

[0064] The spring arm device 1 further comprises a clamping unit 30 for releasably applying a clamping force to the spring rod 4. According to this optional embodiment, the clamping unit 30 is arranged in a fixed position on the spring tube 3 in the region of the second side as viewed in the longitudinal direction 2.

[0065] The spring rod 4 comprises a cylindrical sleeve 31 screwed onto the threaded rod 5, which provides an outer peripheral portion 32. According to this optional embodiment, the sleeve 31 is arranged on the threaded rod 5 in a rotationally fixed manner via self-locking. Alternatively or additionally, the sleeve 31 can also be fixed in position on the threaded rod 5 by means of a securing element (not shown), such as a locking ring, a locking pin, or a locking screw. The sleeve 31 can also be pressed onto the threaded rod 5 and / or the threaded rod 5 and the sleeve 31 can be screwed together in a clamped state, for example, by the sleeve 31 being counter-tightened against the threaded bushing 9.

[0066] The clamping unit 30 is designed such that by applying the clamping force to the spring rod 4, the spring rod 4 is locked in its position relative to the spring tube 3.

[0067] Advantageous details of the clamping unit 30 are described in more detail below with reference to Figures 2 to 4. Figure 2 schematically shows a perspective side view of a partial area on the second side of the spring arm device 1 from Figure 1, wherein the spring tube 3 is shown partially transparent in order to be able to recognize the components accommodated therein. Figure 3 schematically shows a perspective sectional view through the spring arm device 1 from Figures 1 and 2 at the level of the clamping unit 30. Figure 4 schematically shows a perspective sectional view through a partial area of ​​the spring arm device 1 from Figures 1 to 3 along the longitudinal direction 2.

[0068] In the present case, the clamping unit 30 comprises a clamping ring 33, which is inserted inside the spring tube 3. The clamping ring 33 is formed from an annular base body 34 with a slot 35 extending radially through the base body 34. The base body 34 is thus a ring segment with opposite free ends at the slot 35, wherein the opposite free ends are spaced apart from each other by a predetermined distance (the width of the slot 35) when the clamping ring 33 is unloaded.

[0069] If the free ends of the clamping ring 33 are pressed toward each other from the unclamped state, the pitch circle diameter on which the radial inner surface is located decreases accordingly. The radial inner surface of the clamping ring 33 represents a contact surface 36 for applying the clamping force to the outer circumferential section 32 of the spring rod 4. When the clamping ring 33 is compressed, the spring rod 4 guided by the clamping ring 33 can therefore be clamped.

[0070] The clamping ring 33 can be switched between a released state and a state applying the clamping force via an actuating unit, which in this case is designed in the form of a clamping lever 37 (see Figures 2 and 3). In the released state, the outer peripheral portion 32 can slide relative to the contact surface 36, thus enabling the spring rod 4 to move relative to the spring tube 3. In the released state, the inner radius of the clamping ring 33, defined by the contact surface 36, is larger than the outer radius of the outer peripheral portion 32.

[0071] The clamping lever 37 in this case comprises a threaded bolt 39 and a lever handle 38 attached to one end thereof. At the other end, the threaded bolt 39 is screwed into a thread 40 formed in the clamping ring 33. Opposite the gap or slot 35, the threaded bolt 39 is guided in a bore 41 in the clamping ring 33 and is supported by a bolt shoulder 42 on a shoulder 43 in the bore 41 in the axial direction of the threaded bolt 39.

[0072] The threaded bolt 39 is further guided through the spring tube 3 in a receiving bore 44 provided in the spring tube 3. As a result, the threaded bolt 39 is fixed in its position relative to the spring tube 3 and is only displaceable in the axial direction of the receiving bore 44 and is held therein so as to be rotatable about the axial direction of the receiving bore 44. Since the threaded bolt 39 also extends through the bore 41, the clamping ring 33 and thus the clamping unit 30 are also held stationary relative to the spring tube 3 with respect to the longitudinal direction 2.

[0073] By screwing the threaded bolt 39 deeper into the thread 40 via the clamping lever 37, the pitch circle diameter of the contact surface 36 is reduced, so that the clamping force can be applied to the spring rod 4, more precisely to the sleeve 31. By unscrewing the threaded bolt 39 via the clamping lever 37, the clamping force can be released again.

[0074] By setting the clamping lever 37 into a predetermined angular position about the longitudinal axis of the threaded bolt 39, which can optionally be indicated by a marking on the outside of a housing part of the spring tube device 1 (not shown here), the contact pressure between the contact surface 36 and the outer peripheral section 32 can have a predetermined level.

[0075] The contact surface 36 and / or the outer peripheral portion 32 may optionally have at least partially a coating, preferably a brake pad layer, which preferably increases the coefficient of friction between the contact surface 36 and the outer peripheral portion 32.

[0076] The maximum range of movement of the spring rod 4 relative to the spring tube 3, at which the clamping unit 30 can exert the clamping force on the spring rod 4, is predetermined by the length in the longitudinal direction 2 of the outer circumferential section 32, which can be seen in Figure 4. Where applicable, all individual features illustrated in the exemplary embodiments can be combined and / or exchanged with one another without departing from the scope of the invention.

[0077] List of reference symbols

[0078] 1 spring arm device

[0079] 2 Longitudinal direction

[0080] 3 spring tube

[0081] 4 spring rod

[0082] 5 threaded rod

[0083] 6 First sled

[0084] 7 Second sled

[0085] 9 threaded bushing

[0086] 10 paragraph

[0087] 1 1 sliding ring

[0088] 12 spring element

[0089] 13 Indentation

[0090] 14 First fastening unit

[0091] 15 Lever element

[0092] 16 Second fastening unit

[0093] 17 Pull-push rod

[0094] 21 First axis of rotation

[0095] 22 Second axis of rotation

[0096] 23 Third axis of rotation

[0097] 24 Fourth axis of rotation

[0098] 25 Fifth axis of rotation

[0099] 26 Sixth rotation axis 30 Clamping unit

[0100] 31 sleeve

[0101] 32 outer circumference section

[0102] 33 Clamping ring 34 Base body

[0103] 35 slot

[0104] 36 contact surface

[0105] 37 clamping lever

[0106] 38 Lever handle 39 Threaded bolt

[0107] 40 threads

[0108] 41 bore

[0109] 42 bolt heel

[0110] 43 Paragraph 44 Receiving hole

[0111] 100 Tragarmsystem

Claims

Claims 1. Spring arm device (1) for a support arm system (100) for holding a medical device, comprising a spring tube (3) and a spring rod (4) arranged at least partially in the interior of the spring tube (3) and displaceable in the longitudinal direction (2) of the spring tube (3) relative to the spring tube (3), characterized in that a clamping unit (30) for releasably applying a clamping force to the spring rod (4) is arranged on the spring tube (3) in a stationary manner as viewed in the longitudinal direction (2).

2. Spring arm device (1) according to claim 1, characterized in that the clamping unit (30) is designed such that by applying the clamping force to the spring rod (4), the spring rod (4) is locked in its position relative to the spring tube (3).

3. Spring arm device (1) according to claim 1 or 2, characterized in that the clamping unit (30) has a contact surface (36) for applying the clamping force to an outer peripheral portion (32) of the spring rod (4).

4. Spring arm device (1) according to the preceding claim, characterized in that the clamping unit (30) is designed such that in the state of application of the clamping force, the contact surface (36) is pressed against the outer peripheral portion (32) with a predetermined contact force.

5. Spring arm device (1) according to one of the preceding claims, characterized in that the clamping unit (30) comprises at least one clamping piece, preferably at least one clamping jaw, and / or a clamping ring (33), wherein the at least one clamping piece and / or the clamping ring (33) comprises the contact surface (36).

6. Spring arm device (1) according to one of the preceding claims, characterized in that the clamping unit (30) comprises an actuating unit for applying and releasing the clamping force.

7. Spring arm device (1) according to the preceding claim, characterized in that the actuating unit comprises a clamping lever (37) or an eccentric lever, and / or the actuating unit comprises a manually operable Handle, preferably a lever handle (38), a screw handle or a star handle.

8. Spring arm device (1) according to one of the preceding claims, characterized in that the spring rod (4) comprises a threaded rod (5).

9. Spring arm device (1) according to the preceding claim, characterized in that the threaded rod (5) has a cylindrical surface section providing the outer peripheral section (32) and / or comprises a sleeve (31) screwed onto a thread of the threaded rod (5) and providing the outer peripheral section (32).

10. Spring arm device (1) according to the preceding claim, characterized in that the sleeve (31) is arranged in a rotationally fixed manner on the threaded rod (5).

11. Spring arm device (1) according to the preceding claim, characterized in that the sleeve (31) is fixed in its position relative to the threaded rod (5) by means of a securing element, a securing ring, a securing pin or a securing screw on the threaded rod (5), and / or the sleeve (31) is pressed onto the threaded rod (5), and / or the threaded rod (5) and the sleeve (31) are screwed together in a clamped state, and / or the screw connection of the threaded rod (5) and the sleeve (31) is designed to be self-locking.

12. Spring arm device (1) according to one of the preceding claims, characterized in that the spring rod (4) is mounted translationally, preferably slidingly, in the spring tube (3), wherein the spring rod (4) preferably comprises at least one slide (6, 7) mounted translationally relative to the spring tube (3), preferably slidingly, wherein the spring rod (4) preferably comprises on a first side a first slide (6) mounted translationally relative to the spring tube (3) and on a second side a second slide (7) mounted translationally relative to the spring tube (3).

13. Spring arm device (1) according to one of the preceding claims, characterized in that the spring tube (3) is arranged on a first side on a first fastening unit (14) so ​​as to be rotatable about a first axis of rotation (21), and the spring rod (4) is connected on the first side to a lever element (15) so as to be rotatable about a second axis of rotation (22) oriented parallel to the first axis of rotation (21), and the lever element (15) on its side opposite the spring rod (4) is arranged on the first fastening unit (14) so ​​as to be rotatable about a third axis of rotation (23) which is spaced apart from the first axis of rotation (21) and oriented parallel to the first axis of rotation (21).

14. Spring arm device (1) according to one of the preceding claims, characterized in that a spring element (12), preferably a compression spring, is provided in the spring tube (3) for pretensioning the spring rod (4) relative to the spring tube (3), wherein the spring element (12) is preferably supported at one end on the spring tube (3), preferably on a shoulder provided in the spring tube (3), and at the other end on the spring rod (4), preferably on a shoulder provided on the spring rod (4).

15. Spring arm device (1) according to one of the preceding claims, characterized in that the contact surface (36) and / or the outer peripheral portion (32) at least partially have a coating, preferably a brake pad layer, which increases the coefficient of friction between the contact surface (36) and the outer peripheral portion (32). 1 . Support arm system (100) for holding at least one medical device, comprising at least one spring arm device (1) according to one of the preceding claims.

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