GB1598378A - Threaded body for screwing into a skull - Google Patents
Threaded body for screwing into a skull Download PDFInfo
- Publication number
- GB1598378A GB1598378A GB8643/78A GB864378A GB1598378A GB 1598378 A GB1598378 A GB 1598378A GB 8643/78 A GB8643/78 A GB 8643/78A GB 864378 A GB864378 A GB 864378A GB 1598378 A GB1598378 A GB 1598378A
- Authority
- GB
- United Kingdom
- Prior art keywords
- adapter
- thread
- screwing
- threaded body
- threaded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 210000003625 skull Anatomy 0.000 title claims description 23
- 210000000988 bone and bone Anatomy 0.000 claims description 11
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 4
- 210000001951 dura mater Anatomy 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 210000004761 scalp Anatomy 0.000 claims description 3
- 230000000284 resting effect Effects 0.000 claims description 2
- 238000007514 turning Methods 0.000 claims description 2
- 230000000717 retained effect Effects 0.000 claims 1
- 238000009530 blood pressure measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002490 cerebral effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000007917 intracranial administration Methods 0.000 description 1
- 210000003140 lateral ventricle Anatomy 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/03—Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; Measuring pressure in body tissues or organs
- A61B5/031—Intracranial pressure
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Hematology (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Neurosurgery (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Physics & Mathematics (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
- Surgical Instruments (AREA)
Description
(54) THREADED BODY FOR SCREWING INTO A SKULL (7 1 ) We, S I EMEN S AKTIENGESELLSCHAFT, a German company, of Berlin and Munich, Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to a threaded body for screwing into a skull. More particularly this invention relates to a threaded body which is formed as an adapter for holding a pressure transducer for intracranial pressure measurements in a skull. The threaded body comprises a cylindrical sleeve which has an external thread at one end region for screwing into the skull. When the threaded body is formed as an adapter the other end can be closed, after insertion of the pressure transducer, by means of an axially slotted threaded cap.
In addition to cerebrospinal pressure measurement in the lateral ventricle via a catheter with an external pressure transducer, methods for cerebral pressure measurement have succeeded in which commercial miniature pressure transducers are implanted in the epidural skull cavity. In these methods it is important that the pressure sensitive membrane of the pressure transducer rests on the 'dura mater' in a coplanar manner. An adapter which is screwable into the patient's skull to hold and position the pressure transducer should be flush with the underside of the bone and should be sealed off from the environment.
According to the present invention there is provided a threaded body, for screwing into a skull, comprising a cylindrical body one end region of which is provided with a first external thread or threads, and which is conically tapered over a distal portion of that region, the thread or threads being relief ground in said portion of said region, and one or more grooves in the side of the cylindrical body, the or each of which extends from said one end overpart of but, but not all of, the length of the body; wherein the arrangement is such that, in use, said one end is introduced into a preformed bore in a skull and said threaded body is then screwed into the bore, the threads cutting a corresponding internal thread in the bore of the skull in a self tapping manner.
The construction of a threaded body or adapter with these features produces good self-tapping ability during the screwing in operation of the threaded body with only a small amount of energy being expended.
The threaded body may be secured into a skull so that its one end is flush with the inside surface of the skull.
Preferably there are three grooves uniformly distributed around the cylindrical body so that the angle between any two grooves is 120 .
Preferably there is a single thread on said one end region which has a pitch of 1.5 mm.
Preferably the threaded body constitutes an adapter with a bore for a pressure transducer and there is provided a cap for closing the other end of the cylindrical body.
Conveniently the cap is an axially slotted threaded cap and the other end of the cylindrical body is provided with a second thread, the arrangement being such that, in use, the theaded cap can be screwed onto said second thread so as to retain a pressure transducer placed in the bore of the threaded body.
Preferably the length of the cylindrical body corresponds to the length of the pressure transducer to be used. This may have the advantage that the height of the threaded body or adapter is small enough for it not to project excessively above the cranium. Thus, the scalp can be replaced after the pressure transducer has been fitted.
Conveniently the other end of the cylindrical body has recesses so that the threaded body can be driven by a screwing in tool.
The other end of the cylindrical body may be provided with a polygonal profile for attachment to a screwing in tool
When a threaded body according to the invention iS being screwed into a bore in a skull by means of a screwing in tool, the screwing in tool may be secured to the threaded body by means of a screw cap which is screwed onto the second thread formed at the other end of the cylindrical body, the threaded cap being part of the screwing in tool.
For a better understanding of the present invention and to show more clearly how the same may be carried into effect reference will now be made, by way of example, to the accompanying drawing, in which:
Figure 1 shows a diagrammatic representation of a threaded body according to the invention which is formed as an adapter for an associated pressure transducer and is shown located in a skull;
Figure 2a shows a side view of the adapter; and
Figure 2b shows a view of the underside of the adapter.
Figure 1 shows a cranial bone 1 of, for example, a human which, in order to hold an adapter 2, has a bore 3 the diameter of which corresponds to the diameter of the adapter. One end region of the adapter 2 is secured inside a bore in the cranial bone with a pressure-sensitive membrane of the adapter resting on the 'dura mater' 4. The height of the adapter 2 is determined solely by the length of a pressure transducer 5 which is to be inserted and preferably the adapter 2 is of such a height that after the pressure transducer 5 is secured in the adapter 2 by a retaining cap 6, it can be covered by the scalp 7.
Figure 2a, shows the cylindrical sleeve 8 of the adapter 2. One end region 9 of the adapter 2 is threaded, preferably with a single thread 10 of 1.5 mm pitch. The distal portion of the region 9 tapers conically. The initial portion of the thread of the screw thread 10 is relief ground so that when the sleeve 8 is secured into the cranial bone a self-tapping and cutting effect similar to a thread cutter is produced. At the other end 11 of the adapter 2 the sleeve 8 has a further external thread 12 on to which an axially slotted retaining cap 13 with a corresponding internal thread is screwed, after the pressure transducer 5 has been inserted.
The retaining cap 13 is milled externally so that it can be gripped and handled more easily. On opposite sides of the end 11 of the sleeve periphery two recesses 14 are formed, into which a screwing-in tool (not shown) for screwing the sleeve 8 into the skull may engage. Such a tool is described in
British Patent Application No. 8644/78 Se rial No. 1598379. The screwing-in tool may be firmly held on the adapter 2 by a second screw cap screwed on to the thread 12. The screw cap forms part of the screwing in instrument and is similar to the retaining cap 13 except that it is not slotted.
Figure 2b shows the conical tapered portion of the end region 9 of the sleeve 8 in the area of the initial relief ground thread. On this end region 9 there are three longitudinal grooves 15, 16 and 17, staggered by 120 .
These longitudinal grooves 15 and 17 produce the cutting operation and when the adapter is screwed into the cranial bone they hold the turnings that are produced. Since the longitudinal grooves 15 to 17 each run only over the initial threads, a sealed connection between the thread 10 and cranial bone 1 is achieved when the sleeve 8is fully screwed in.
WHAT WE CLAIM IS:
1. A threaded body, for screwing into a skull, comprising a cylindrical body one end region of which is provided with a first external thread or threads, and which is conically tapered over a distal portion of that region, the thread or threads being relief ground in said portion of said region, and one or more grooves in the side of the cylindrical body, the or each of which extends from said one end over part of, but not all of, the length of the body; wherein the arrangement is such that, in use, said one end is introduced into a preformed bore in a skull and said threaded body is then screwed into the bore, the threads cutting a corresponding internal thread in the bore of the skull in a self tapping manner.
2. A threaded body as claimed in claim 1, wherein there are three grooves uniformly distributed around the cylindrical body so that the angle between any two grooves is 120 .
3. A threaded body as claimed in claim 1, wherein the threaded body constitutes an adapter with a bore for a pressure transducer and wherein there is provided a cap for closing the other end of the cylindrical body.
4. A threaded body as claimed in any one of claims 1, 2 and 3 wherein there is a single thread on said one end region which has a pitch of 1.5 mm.
5. A threadedbody 3, or claim 4, when appendant to claim 3, wherein the cap is an axially slotted thread cap, and wherein the other end of the cylindrical body is provided with a second thread, the arrangement being such that, in use, the threaded cap can be screwed onto said second thread so as to retain a pressure transducer placed in the bore of the threaded body.
6. A threaded body as claimed in any
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (10)
1. A threaded body, for screwing into a skull, comprising a cylindrical body one end region of which is provided with a first external thread or threads, and which is conically tapered over a distal portion of that region, the thread or threads being relief ground in said portion of said region, and one or more grooves in the side of the cylindrical body, the or each of which extends from said one end over part of, but not all of, the length of the body; wherein the arrangement is such that, in use, said one end is introduced into a preformed bore in a skull and said threaded body is then screwed into the bore, the threads cutting a corresponding internal thread in the bore of the skull in a self tapping manner.
2. A threaded body as claimed in claim 1, wherein there are three grooves uniformly distributed around the cylindrical body so that the angle between any two grooves is 120 .
3. A threaded body as claimed in claim 1, wherein the threaded body constitutes an adapter with a bore for a pressure transducer and wherein there is provided a cap for closing the other end of the cylindrical body.
4. A threaded body as claimed in any one of claims 1, 2 and 3 wherein there is a single thread on said one end region which has a pitch of 1.5 mm.
5. A threadedbody 3, or claim 4, when appendant to claim 3, wherein the cap is an axially slotted thread cap, and wherein the other end of the cylindrical body is provided with a second thread, the arrangement being such that, in use, the threaded cap can be screwed onto said second thread so as to retain a pressure transducer placed in the bore of the threaded body.
6. A threaded body as claimed in any
one of the preceding claims, wherein the other end of the cylindrical body has recesses so that the threaded body can be driven by a screwing in tool.
7. A threaded body as claimed in any of claims 1 to 5, wherein the other end of the cylindrical body has a polygonal profile for attachment to a screwing in tool.
8. A threaded body substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
9. In combination a threaded body as claimed in claim 3 or claim 8, or any one of claims 3 to 7 when appendant directly or indirectly to claim 3, and a pressure transducer located in the bore in the cylindrical body and retained in the bore by a cap.
10. A combination as claimed in claim 9, wherein the length of the threaded body corresponds to the length of the pressure transducer.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE7706739 | 1977-03-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1598378A true GB1598378A (en) | 1981-09-16 |
Family
ID=6676183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8643/78A Expired GB1598378A (en) | 1977-03-04 | 1978-03-03 | Threaded body for screwing into a skull |
Country Status (4)
| Country | Link |
|---|---|
| FR (1) | FR2382225A1 (en) |
| GB (1) | GB1598378A (en) |
| IT (1) | IT1093843B (en) |
| NL (1) | NL7801416A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4600013A (en) * | 1984-05-08 | 1986-07-15 | Howard Landy | Intracranial pressure monitoring probe |
| WO2006089607A1 (en) | 2005-02-24 | 2006-08-31 | Raumedic Ag | Device for measuring brain parameters |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4413985A (en) * | 1981-09-02 | 1983-11-08 | The United States Of America As Represented By The Dept. Of Health & Human Services | Hydrocephalic antenatal vent for intrauterine treatment (HAVIT) |
| US4438773A (en) * | 1982-03-15 | 1984-03-27 | Paul L. Sweeney, Jr. | Subarachnoid bolt |
| US4572212A (en) * | 1982-03-15 | 1986-02-25 | Paul L. Sweeney, Jr. | Subarachnoid bolts |
| FR2682281B1 (en) * | 1991-10-11 | 1997-01-03 | Sofamor | PERCUTANEOUS SCREW, INTENDED TO SUPPORT IN PARTICULAR A STEREOTAXY FRAMEWORK |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1440724A (en) * | 1972-07-18 | 1976-06-23 | Fredrickson J M | Implantable electromagnetic hearing aid |
| DE7529790U (en) * | 1975-09-20 | 1976-02-19 | Lysell, Ralf, 2340 Kappeln | Device for preparing a bone canal in which an implant is to be cemented |
| DE2621909A1 (en) * | 1976-05-17 | 1977-12-01 | Gobiet Wolfgang | Measurement of intracranial pressure in brain - is by miniature blood pressure sensor mounted in cranium by screw:in jig |
-
1978
- 1978-02-07 NL NL7801416A patent/NL7801416A/en not_active Application Discontinuation
- 1978-02-21 IT IT20447/78A patent/IT1093843B/en active
- 1978-02-22 FR FR7805053A patent/FR2382225A1/en active Pending
- 1978-03-03 GB GB8643/78A patent/GB1598378A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4600013A (en) * | 1984-05-08 | 1986-07-15 | Howard Landy | Intracranial pressure monitoring probe |
| WO2006089607A1 (en) | 2005-02-24 | 2006-08-31 | Raumedic Ag | Device for measuring brain parameters |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1093843B (en) | 1985-07-26 |
| IT7820447A0 (en) | 1978-02-21 |
| FR2382225A1 (en) | 1978-09-29 |
| NL7801416A (en) | 1978-09-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |