Continuous irrigation system for medical use

Abstract

The invention relates to a continuous irrigation system (10) for medical use, comprising: an inner shaft (20), which has a wall (21), a distal end (20a), a proximal end (20b), an inner shaft external diameter (ISA) and an inner shaft length (ISL); and an outer shaft (40), which has a wall (41), a distal end (40a), a proximal end (40b), an outer shaft internal diameter (ASI) and an outer shaft length (ASL), wherein at the proximal end (20b) of the inner shaft (20) there is a first connecting piece (30), which has a first axial through-opening (31) into which there opens a first connector (32) for an irrigation hose, wherein at the proximal end (40b) of the outer shaft (40) there is a second connecting piece (50), which has a second axial through-opening (51) for the inner shaft (20) and on which a second connector (52) for a suction hose is arranged, wherein at least one suction opening (46) is arranged in a portion (45) of the wall (41) of the outer shaft (40) adjoining the distal end (40a), and wherein, when the inner shaft (20) has been inserted into the outer shaft (40), an annular space (70) is formed between the inner shaft (20) and the outer shaft (40) and a portion (25) of the distal end (20a) of the inner shaft protrudes beyond the distal end (40a) of the outer shaft (40), wherein the distal end (20a) of the inner shaft (20) has a circumferential thickening (24) with an external diameter (VA) that corresponds to the outer shaft internal diameter (ASI), wherein at least one channel (60) with a first end (61) and a second end (62) is arranged in the thickening (24), and wherein the first end (61) of the channel (60) is arranged in the portion (25) and the second end (62) opens into the annular space (70).

Description

[0001] Medical continuous flushing system

[0002] Medical continuous irrigation systems are known, comprising an inner shaft having a wall, a distal end, a proximal end, an outer diameter, and an inner length, and an outer shaft having a wall, a distal end, a proximal end, an inner diameter, and an outer length. A first connection piece is arranged at the proximal end of the inner shaft, having a first axial through-opening and a first connection for an irrigation hose. A second connection piece is arranged at the proximal end of the outer shaft, having a second axial through-opening for the inner shaft and a second connection for a suction hose. At least one suction opening is arranged in a section of the outer shaft wall adjacent to the distal end.When the inner and outer shafts are inserted into the outer shaft, an annular space is formed between them. Typically, the distal end of the inner shaft extends beyond the distal end of the outer shaft. Such continuous irrigation systems allow for the continuous supply of fluid, particularly irrigation fluid, through the inner shaft during surgery, while simultaneously aspirating it through the annular space between the inner and outer shafts. Instruments and optics for observing the surgical field can be guided through the lumen of the inner shaft alongside the fluid.

[0003] The known medical continuous irrigation system is to be improved with regard to the possible drainage of the irrigation fluid. This objective is achieved according to the invention by a medical continuous irrigation system with the features of claim 1.

[0004] Advantageous features and further training options are specified in the dependent requirements.

[0005] The medical continuous irrigation system according to the invention comprises an inner shaft, which has a wall, a distal end, a proximal end, an inner shaft outer diameter and an inner shaft length, and an outer shaft, which has a wall, a distal end, a proximal end, an outer shaft inner diameter and an outer shaft length, wherein a first connecting piece is arranged at the proximal end of the inner shaft, which has a first axial through-opening into which a first connection for an irrigation hose opens, wherein a second connecting piece is arranged at the proximal end of the outer shaft, which has a second axial through-opening for the inner shaft and on which a second connection for a suction hose is arranged, wherein at least one suction opening is arranged in a section of the wall of the outer shaft adjacent to the distal end, and wherein,When the inner shaft is inserted into the outer shaft, an annular space is formed between the inner shaft and the outer shaft, and the distal end of the inner shaft projects beyond the distal end of the outer shaft with a section, the inner shaft is characterized in that it has a circumferential thickening at its distal end with an outer diameter corresponding to the inner diameter of the outer shaft, wherein at least one channel with a first end and a second end is arranged in the thickening, the first end of the channel being located in the section and the second end opening into the annular space.

[0006] Such a thickening, which can be designed, for example, as a circumferential ridge or other section with a larger outer diameter than the inner shaft's outer diameter, allows the distal end of the inner shaft to be radially fixed within the outer shaft. Furthermore, the thickening seals the annular space formed between the inner and outer shafts towards the distal end, thus preventing the fluid supplied through the inner shaft from being drawn back through the outer shaft without contacting the surgical site.

[0007] In known continuous flushing systems, suction occurs solely through the suction openings located in the region of the distal end of the outer shaft. These openings, viewed from the distal end of the continuous flushing system, lie behind the thickening and open radially directly into the annular space. The at least one channel provided according to the invention can shift the suction point further towards the distal end of the continuous flushing system, thereby creating an improved drainage option. The second end of the channel can, in particular, open axially into the annular space, which can result in flow-related advantages during suction.

[0008] Advantageously, at least one channel is designed as a groove. Such a groove is particularly easy to manufacture and can, for example, be ground or milled.

[0009] According to a preferred embodiment of the invention, the

[0010] The channel is arranged in an axial direction. Such an arrangement allows the length of the channel to be minimized.

[0011] A particularly preferred embodiment of the invention provides that the channel has a continuously increasing depth at its first end. This can be achieved, for example, by a chamfer or a rounded groove end. On the one hand, such a design, which avoids sharp edges, largely prevents damage to the surrounding tissue. On the other hand, any turbulence that may occur at the first end of the channel can be minimized in this way.

[0012] Preferably, the inner shaft has several channels distributed around its circumference at the distal end, preferably several equidistantly distributed channels. Arranging multiple channels increases the flow volume, thereby improving the drainage of the rinsing fluid. For example, the inner shaft can have at least two, preferably three, four, six, eight, or twelve channels at the distal end. An equidistant arrangement of the channels allows for uniform aspiration.

[0013] Advantageously, the thickening extends over a length greater than the length of the section. This particularly allows the thickening to be arranged from the distal end face of the inner shaft to the overlap with the outer shaft.

[0014] Preferably, the inner shaft is made of metal. This allows the inner shaft to be reused multiple times. In an alternative, advantageous embodiment, the inner shaft is made of plastic, particularly by injection molding. Such a design enables cost-effective production of the inner shaft. If the inner shaft is made of plastic, it can be disposed of as a single-use instrument after use, thus eliminating the need for time-consuming cleaning.

[0015] Preferably, the inner shaft is made of PPSU (polyphenylsulfone), PEEK (polyetheretherketone), or POM (polyoxymethylene). These types of plastics are particularly well suited for injection molding.

[0016] Preferably, the inner diameter of the outer shaft is about 5% to 15%, preferably about 7% to 13%, and particularly preferably about 10%, larger than the outer diameter of the inner shaft. This gives the annular space between the inner and outer shafts a suitable dimension for the liquid to be extracted.

[0017] According to a preferred embodiment, several suction openings, preferably several rows with multiple suction openings, are arranged around the circumference of the section of the outer shaft wall adjacent to the distal end. Such a design allows suction from different directions relative to the outer shaft.

[0018] Preferably, the first and second connecting pieces can be detachably fixed to one another by a releasable connection, for example, a bayonet fitting, a snap-fit ​​connection, or another mechanical connection. Fixing the two connecting pieces, and thus the inner and outer shafts, to each other improves the stability of the continuous flushing system.

[0019] A preferred embodiment of the invention provides that the end face of the distal end of the inner shaft comprises at least one section which is arranged inclined to a longitudinal axis of the inner shaft, preferably at an angle of 30° to 60°, particularly preferably at an angle of 40° to 50°, and especially at an angle of approximately 45°. If the microchip is arranged on this section, the viewing area of ​​the microchip is inclined to the longitudinal axis of the inner shaft, thereby improving the view of the surgical area.

[0020] In order to enable control of the supply and extraction of liquid, the first port preferably includes a first valve and / or the second port includes a second valve.

[0021] An embodiment of the invention is explained in detail with reference to the following figures. They show

[0022] Fig. 1 shows a side view of an embodiment of a medical continuous irrigation system according to the invention, comprising an inner shaft and an outer shaft.

[0023] Fig. 2 shows another side view of the continuous flushing system according to Fig. 1,

[0024] Fig. 3 shows a longitudinal section along line AA through the continuous irrigation system according to Fig. 2, Fig. 4 shows a close-up of the distal end of the continuous irrigation system according to Fig. 3.

[0025] Fig. 5 shows a front view of the continuous flushing system according to Fig. 1.

[0026] Fig. 6 shows a side view of the inner shaft of the continuous flushing system according to Fig. 1.

[0027] Fig. 7 shows another side view of the inner shaft according to Fig. 6,

[0028] Fig. 8 shows a longitudinal section along line CC through the inner shaft according to Fig. 7,

[0029] Fig. 9 shows a close-up of the distal end of the inner shaft according to Fig. 8.

[0030] Fig. 10a a perspective view of the distal end of the inner shaft according to Fig. 6,

[0031] Fig. 10b shows a perspective view of a distal end of an alternative embodiment of an inner shaft,

[0032] Fig. 10c shows a perspective view of a distal end of another alternative embodiment of an inner shaft.

[0033] Fig. 11 shows a side view of the outer shaft of the continuous flushing system according to Fig. 1, Fig. 12 shows another side view of the outer shaft according to Fig. 11.

[0034] Fig. 13 shows a longitudinal section along line EE through the outer shaft according to Fig. 11 and

[0035] Fig. 14 shows a close-up of the distal end of the outer shaft according to Fig. 13.

[0036] Figures 1 to 5 show different views of an embodiment of a continuous flushing system 10 with an inner shaft 20 and an outer shaft 40, figures 6 to 10a show different views of the inner shaft 20 and figures 11 to 15 show different views of the outer shaft 40.

[0037] In all figures, the same reference ci ff denotes identical or functionally equivalent parts, whereby, for the sake of clarity, not all reference ci ff are given in all figures.

[0038] The inner shaft 20 has a distal end 20a, a proximal end 20b, an inner shaft outer diameter ISA, and an inner shaft length ISL. The inner shaft 20 further comprises a wall 21. An end face 23 is arranged at the distal end 20a of the inner shaft 20, which is formed in particular by the end face of the wall 21. The inner shaft 20 can be designed as a hollow tube with a lumen 22.

[0039] The outer shaft 40 has a distal end 40a, a proximal end 40b, a wall 41, an inner diameter AS I of the outer shaft, and an outer shaft length ASL. The outer shaft 40 can be designed as a hollow tube with a lumen 42. At least one suction opening 46 is arranged in a section 45 of the wall 41 of the outer shaft 40 adjacent to the distal end 40a of the outer shaft 40. As can be seen particularly in Fig. 14, in the present embodiment, several suction openings 46, preferably several rows with several suction openings 46, are arranged around the circumference in the section 45 of the wall 41 of the outer shaft 40 adjacent to the distal end 40a.

[0040] The outer shaft inner diameter AS I is larger than the inner shaft outer diameter ISA, so that the inner shaft 20 can be inserted into the outer shaft 40. An annular space 70 is formed between the inner shaft 20 and the outer shaft 40. The outer shaft inner diameter AS I can be about 5% to 15%, preferably about 7% to 13%, and particularly preferably about 10%, larger than the inner shaft outer diameter ISA.

[0041] The inner shaft 20 has a circumferential thickening 24 at its distal end 20a with an outer diameter VA that is larger than the inner shaft's outer diameter ISA. The thickening 24 can, for example, be designed as a circumferential collar or other section with an outer diameter VA that is larger than the inner shaft's outer diameter ISA. The outer diameter VA corresponds, in particular, to the outer shaft's inner diameter AS I and thus closes off the annular space 70 formed between the inner shaft 20 and the outer shaft 40 towards the distal end (see especially Fig. 4). The thickening 24 can extend over a length X that is greater than the length of the section 25. The thickening 24 can have a wall thickness WA that is greater than the wall thickness of the wall 21.

[0042] A first connecting piece 30 is arranged at the proximal end 20b of the inner shaft 20, which has a first axial through-opening 31 into which a first connection 32 for a (not shown) flushing hose opens. The first connection 32 may include a first valve 33. Via the first connection 32 and through the lumen 22 of the inner shaft 20, fluid, in particular a flushing fluid, can be guided to the distal end 20a of the inner shaft 20 and from there supplied to an area around the distal end 20a of the inner shaft 20 or the distal end 40a of the outer shaft 40.

[0043] A second connection piece 50 is arranged at the proximal end 40b of the outer shaft 40. This connection piece has a second axial through-opening 51 for the inner shaft 20 and a second connection 52 for a suction hose (not shown) is arranged on this connection. The second connection 52 may include a second valve 53. Fluid can be suctioned from the area around the distal end 20a of the inner shaft 20 or the distal end 40a of the outer shaft 40 via the second connection through the suction openings 46 and the annular space 70. In particular, fluid can be supplied via the first connection 32 and suctioned out via the second connection 52 simultaneously and continuously.

[0044] The first connection 32 can be arranged directly on the first connection piece 30. In the illustrated embodiment, the first connection 32 is arranged on the second connection piece 50 of the outer shaft 40, wherein an opening 35 in the first connection piece 30 allows it to enter the axial through-opening 31 (see Fig. 3).

[0045] In the thickening 24, at least one channel 60 is arranged with a first end 61 and a second end 62, wherein the first end 61 of the channel 60 is arranged in the projecting section 25 and the second end opens into the annular space 70. Thus, fluid can flow through the channel 60 from the area around the section 25 of the inner shaft 20, which projects beyond the distal end 40a of the outer shaft 40, into the annular space 70. The at least one channel 60 is arranged, in particular, to extend in the axial direction.

[0046] The at least one channel 60 can be configured as a groove. This groove can, for example, be ground or milled into the thickening 24. At its first end 61, the at least one channel 60 preferably has a continuously increasing depth. This depth can, for example, be formed by a chamfer or a rounded groove end. At its second end 61, the channel 60 transitions axially into the annular space 70, particularly at the end of the thickening 24.

[0047] The inner shaft 20 has, preferably at least two, and more preferably several, channels 60 distributed around its circumference at the distal end 20a, which are particularly arranged equidistantly. The embodiment of the inner shaft 20 shown in Figures 1 to 10a comprises, for example, twelve channels 60. Figure 10b shows the distal end 20a' of an alternative embodiment of an inner shaft 20', which differs from the inner shaft 20 only in that the distal end 20a' has eight channels 60. Figure 10c shows the distal end 20a'' of a further alternative embodiment of an inner shaft 20'', which differs from the inner shaft 20 only in that the distal end 20a'' has only six channels 60.

[0048] The first connecting piece 30 and the second connecting piece 50 can be detachably fixed to one another by a detachable connection, for example a connection of the type of a bayonet fitting 72 or a snap connection or any other mechanical connection, in order to fix the inner shaft 20 in its position relative to the outer shaft when it is inserted into the outer shaft 40.

[0049] When the inner shaft 20 is inserted into the outer shaft 40, preferably the distal end 20a of the inner shaft 20 protrudes over the distal end 40a of the outer shaft 40 with a section 25 (see in particular Fig. 1 and 4).

[0050] The end face 23 of the distal end 20a of the inner shaft 20 can comprise at least one section 26 which is inclined to a longitudinal axis L of the inner shaft 20, preferably at an angle a of 30° to 60°, particularly preferably at an angle a of 40° to 50°, and especially at an angle a of about 45°.

[0051] The outer shaft 40 can be made of metal, preferably stainless steel. The inner shaft 20 can also be made of metal, for example, stainless steel. Alternatively, the inner shaft 20 can be made of plastic, for example, PPSU (polyphenylsulfone), PEEK (polyetheretherketone), or POM (polyoxymethylene), and can be manufactured, in particular, by injection molding. This allows the inner shaft 20 to be manufactured as a single-use component for disposal after use, thus avoiding the need for costly autoclaving.

[0052] Reference character list

[0053] 10 Continuous flushing system

[0054] 20 inner shaft

[0055] 20a distal end

[0056] 20b proximal end

[0057] 21 wall

[0058] 22 lumens

[0059] 23 Front surface

[0060] 24 Thickening

[0061] Section 25

[0062] Section 26

[0063] 30 first connecting piece

[0064] 31 first axial through opening

[0065] 32 first connection

[0066] 33 first valve

[0067] 35 Opening

[0068] 40 Outer shaft

[0069] 40a distal end

[0070] 40b proximal end

[0071] 41 wall

[0072] 42 lumens

[0073] Section 45

[0074] 46 Extraction opening

[0075] 50 second connector

[0076] 51 second axial through-opening

[0077] 52 second connection

[0078] 53 second valve

[0079] 60-channel

[0080] 61 first end

[0081] 62 second end

[0082] 70 ring space

[0083] L Longitudinal axis ISA Inner shaft outer diameter

[0084] ISL inner shaft length

[0085] WA wall thickness

[0086] VA outer diameter of the thickening AS I outer shaft inner diameter

[0087] ASL outer shaft length

[0088] X length a angle

Claims

Patent claims 1. Medical continuous irrigation system (10) with an inner shaft (20) having a wall (21), a distal end (20a), a proximal end (20b), an inner shaft outer diameter (ISA) and an inner shaft length (ISL), and an outer shaft (40) having a wall (41), a distal end (40a), a proximal end (40b), an outer shaft inner diameter (ASI) and an outer shaft length (ASL), wherein a first connection piece (30) is arranged at the proximal end (20b) of the inner shaft (20) having a first axial through-opening (31) into which a first connection (32) for an irrigation hose opens, wherein a second connection piece (50) is arranged at the proximal end (40b) of the outer shaft (40) having a second axial through-opening (51) for the inner shaft (20) and on which a second connection (52) for a suction hose is arranged,wherein at least one suction opening (46) is arranged in a section (45) of the wall (41) of the outer shaft (40) adjacent to the distal end (40a), and wherein, when the inner shaft (20) is inserted into the outer shaft (40), an annular space (70) is formed between the inner shaft (20) and the outer shaft (40), and the distal end (20a) of the inner shaft projects beyond the distal end (40a) of the outer shaft (40) with a section (25), characterized in that the inner shaft (20) has a circumferential thickening (24) at the distal end (20a) with an outer diameter (VA) which corresponds to the inner diameter (ASI) of the outer shaft, wherein at least one channel is provided in the thickening (24), (60) with a first end (61) and a second end (62) is arranged, wherein the first end (61) of the channel (60) is arranged in section (25) and the second end (62) opens into the annular space (70).

2. Medical continuous rinsing system according to one of the preceding claims, characterized in that the at least one channel (60) is designed as a groove.

3. Medical continuous rinsing system according to one of the preceding claims, characterized in that the channel (60) is arranged extending in the axial direction.

4. Medical continuous rinsing system according to one of the preceding claims, characterized in that the channel (60) has a continuously increasing depth at its first end (61).

5. Medical continuous irrigation system according to one of the preceding claims, characterized in that the inner shaft (20) has several channels (60) distributed around its circumference at the distal end (20a), preferably several equidistantly distributed channels (60).

6. Medical continuous rinsing system according to one of the preceding claims, characterized in that the inner shaft (20) has at least two, preferably three or four or six or eight or twelve, channels (60) at the distal end (20a).

7. Medical continuous rinsing system according to one of the preceding claims, characterized in that the thickening extends over a length (X) which is greater than the length of the section (25).

8. Medical continuous rinsing system according to one of the preceding claims, characterized in that the inner shaft (20) is made of metal.

9. Medical continuous rinsing system according to one of the preceding claims, characterized in that the inner shaft (20) is made of plastic, in particular by injection molding.

10. Medical continuous rinsing system according to one of the preceding claims, characterized in that the inner shaft (20) is made of PPSU, PEEK or POM.

11. Medical continuous irrigation system according to one of the preceding claims, characterized in that the outer shaft inner diameter (ASI) is approximately 5% to 15%, preferably approximately 7% to 13%, particularly preferably approximately 10%, larger than the inner shaft outer diameter (ISA).

12. Medical continuous rinsing system according to one of the preceding claims, characterized in that several suction openings (46) are arranged around the circumference of the section (45) of the wall (41) of the outer shaft (40) adjacent to the distal end (20a), preferably several rows with several suction openings (46).

13. Medical continuous rinsing system according to one of the preceding claims, characterized in that the first connecting piece (30) and the second connecting piece (50) can be detachably fixed to one another by a detachable connection, for example a connection of the type of a bayonet fitting or a snap connection or any other mechanical connection.

14. Medical continuous irrigation system according to one of the preceding claims, characterized in that the end face (23) of the distal end (20a) of the inner shaft (20) comprises at least one section (26) which is arranged inclined to a longitudinal axis (L) of the inner shaft (20), preferably at an angle (a) of 30° to 60°, particularly preferably at an angle (a) of 40° to 50°, and especially at an angle (a) of about 45°.

15. Medical continuous rinsing system according to one of the preceding claims, characterized in that the first port (31) comprises a first valve (33) and / or the second port (51) comprises a second valve (53).

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