Abstract
A medical syringe pump includes a housing and a drive head movable linearly to the housing by a tube-shaped or rod-shaped retention arm for actuating a syringe inserted in the housing, for which purpose the retention arm is connected in an axially fixed manner with an advance carriage and is in engagement with an advance spindle via the advance carriage. The medical syringe pump includes a twist protection which protects the advance carriage from twisting about the axis of the retention arm.
Claims
1. A medical syringe pump comprising: a housing; a drive head; a retention arm that is tube-shaped or rod-shaped and defining an axis; and a twist protection, the drive head being movable linearly relative to the housing by the retention arm for actuating a syringe inserted in the housing, the retention arm being connected in an axially fixed manner with an advance carriage, the retention arm being in engagement with an advance spindle, and the twist protection preventing the advance carriage from twisting about the axis of the retention arm.
2. The medical syringe pump according to claim 1, wherein the twist protection is of clamp-shaped design and comprises a gate-shaped or U-shaped lateral profile as well as a plurality of feet engaging the advance carriage in a form-fitting manner.
3. The medical syringe pump according to claim 2, wherein the twist protection comprises four feet which are, in a mounted state of the twist protection, oriented substantially perpendicular to the axis of the retention arm and encompass the retention arm.
4. The medical syringe pump according to claim 2, wherein the retention arm comprises circumferential grooves which are formed and arranged such that at least two of the plurality of feet of the twist protection engage in the grooves in a mounted state of the twist protection.
5. The medical syringe pump according to claim 2, wherein the advance carriage comprises recesses which are formed and arranged such that they receive the plurality of feet.
6. The medical syringe pump according to claim 2, wherein the plurality of feet are formed such that, in a mounted state of the twist protection, a clearance or a gap exists between the plurality of feet and a lower side of the housing to permit an axial shifting of the retention arm but prevent twisting of the retention arm about the axis of the retention arm.
7. The medical syringe pump according to claim 2, wherein the twist protection comprises a through-hole oriented in parallel to the plurality of feet of the twist protection, wherein the through-hole is formed at an arc portion of the twist protection that connects the plurality of feet, wherein a locking screw is screwed into the through-hole to retain the twist protection against unintended disengaging at the advance carriage.
Description
BRIEF DESCRIPTION OF THE DRAWING FIGURES
[0026] The subject matter disclosed will now be explained in detail by means of advantageous embodiments and with reference to the associated Figures. The Figures are of schematic nature only and serve only for the understanding of the disclosure. It is pointed out that the features of different embodiments are interchangeable and may occur in any combination.
[0027] FIG. 1 is an isometric view of an operating position of the retention arm with the advance carriage and the advance spindle of the medical syringe pump, wherein the twist protection is illustrated in an exploded view.
[0028] FIG. 2 is a sectional view through the advance carriage and the twist protection in a mounted state.
[0029] FIG. 3 is a sectional view through the axis of the advance spindle and shows the advance carriage and the twist protection in a mounted state.
DETAILED DESCRIPTION
[0030] In the following, the present disclosure and the advantageous embodiments will be described by means of the Figures.
[0031] FIG. 1 is an isometric view of an operating position of the retention arm 2 in the housing of the medical syringe pump in accordance with the disclosure. The retention arm 2 is guided via a rod-shaped advance spindle 6 whose longitudinal axis concurs with the longitudinal axis of the tube-shaped retention arm 2. The retention arm 2 is, substantially via an advance carriage 8, mounted axially with the advance spindle 2 and/or guided by same. The advance carriage 8 is arranged at an end of the retention arm 2 which faces away from the drive head and encompasses same. The advance carriage 8 is connected in an axially fixed manner with the retention arm 2 and the retention arm 2 is, in this view, in a substantially extended state, i.e. in a position in which the advance spindle 6 projects from the retention arm 2. Furthermore, FIG. 1 shows the clamp-shaped twist protection 10 which comprises a substantially cuboid basis and four feet 12. The four feet 12 of the twist protection 10 are each formed at the corners of the basis of the basic body and project perpendicularly to this basis. The feet 12 have a constant cross-section and a rectangular layout. Furthermore, the advance carriage 8 and the clamp-shaped twist protection 10 both comprise a vertical through-hole 14, 16 which are arranged such that the advance carriage 8 and the twist protection 10 are connectable by a locking screw 15.
[0032] FIG. 2 is a sectional view through the advance carriage 8 and the twist protection 10 in a mounted state. The sectional plane extends in parallel along the longitudinal axis of the retention arm 2 of the syringe pump and intersects the advance carriage 8 and two feet 12 of the clamp-shaped twist protection 10. In this view the retention arm 2 of the syringe pump is slid substantially completely over the advance spindle 6, i.e. the retention arm 2 is in a retracted position. In this position of the retention arm 2 the advance carriage 8 and the twist protection 10 fastened thereto are arranged next to a perpendicular housing wall 17 of the syringe pump which comprises a gearing 18 for the advancing of the retention arm 2. The basic body of the advance carriage 8 is of hollow cylinder-shaped design and encloses the retention arm 2 of the syringe pump. At the side facing the basis of the syringe pump, the advance carriage 8 comprises three parallel, substantially skid-shaped projections 20. These projections 20 are of flat design at their underside, so that the advance carriage 8 slides at the inner side of the basis of the syringe pump when the retention arm 2 of the syringe pump performs a linear movement. The four feet 12 of the twist protection 10 extend, in the mounted state, in parallel along the perpendicular housing wall 17 of the syringe pump and engage in vertical recesses of the advance carriage 8 which are adapted to the dimensions of the feet 12 of the twist protection 10. Every two of the feet 12 are arranged at one side of the longitudinal axis of the retention arm 2, i.e. the feet 12 of the twist protection 10 encompass substantially the retention arm 2. Moreover, the twist protection 10 comprises, in this view at the topmost end, a through-hole 14.
[0033] FIG. 3 is a sectional view through the axis of the advance spindle 6 and shows the advance carriage 8 and the twist protection 10 in a mounted state, wherein the sectional view has been taken from the underside of the syringe pump. In this view the advance spindle 6 and the retention arm 2, which has a larger inner diameter than the outer diameter of the advance spindle 6, extend horizontally. The retention arm 2 is connected with the advance spindle 6 via a threaded bearing 22 of the advance carriage 8. A gearing 18 which is partially arranged externally of the syringe pump housing drives the advance spindle 6, so that a linear movement of the retention arm 2 is performed via the threaded bearing 22. In the sectional plane illustrated the retention arm 2 encloses a portion of the threaded bearing 22 of the advance carriage 8, which consequently projects partially from an end of the retention arm 2. The layouts of the four feet 12 of the twist protection 10 are illustrated in this sectional view and engage in recesses of the advance carriage 8 which are provided for the feet 12. In this view the feet 12 of the twist protection 10 are arranged such that every two of the feet 12 are arranged at one side of the axis of the retention arm 2, wherein the axis of the retention arm 2 forms an imaginary mirror axis. The two feet 12 closer to the gearing 18 are, in this view, completely enclosed by the advance carriage 8. The two remaining feet 12 of the twist protection 10 rest, in this view, against the advance carriage 8 with their long layout sides, and the short layout side which is closer to the axis of the retention arm 2 rests against the retention arm 2. For this purpose, the retention arm 2 comprises two lateral grooves 24 in which these two feet 12 engage and abut.
